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The La nanorod and cobalt-manganese spinel were synthesised by an improved sol–gel technique for the selective oxidation of alcohols. The active sites of the catalyst were demonstrated using parameters and a recycling study. Moreover, the catalyst was characterized by Raman spectroscopy, X-ray photoelectron spectroscopy, Fourier transform infrared spectra, X-ray diffraction, and surface analysis to examine the impact of La addition on the structural and morphological characteristics of CoMn2O4. La is introduced into CoMn2O4, which decreases the activation energy; therefore, CoMn2-XLaXO4 selectively oxidizes alcohol at lower temperatures. Higher benzyl alcohol to benzaldehyde conversion was observed for the CoMn1.96La0.04O4 catalyst. The catalyst was further also examined for the selective oxidation of other alcohols. The various commercially important substrates like 2-bromo benzyl alcohol, furfuryl alcohol, etc. undergo selective oxidation using a catalyst was also been investigated. The mechanistic aspects of the catalyst with active sites have been explained using Raman and ATR-FTIR adsorption study. [ABSTRACT FROM AUTHOR]

To overcome limitations of dentin bonding due to collagen degradation at a bonded interface, incorporating bioactive glass (BAG) into dentin adhesives has been proposed to enhance remineralization and improve bonding durability. This study evaluated sol–gel-derived BAGs (BAG79, BAG87, BAG91, and BAG79F) and conventional melt-quenched BAG (BAG45) incorporated into dentin adhesive to assess their remineralization and mechanical properties. The BAGs were characterized by using field-emission scanning electron microscopy (FE-SEM) and transmission electron microscopy for surface morphology. The surface area was measured by the Brunauer–Emmett–Teller method. X-ray diffraction (XRD) analysis was performed to determine the crystalline structure of the BAGs. Adhesive surface analysis was performed after approximating each experimental dentin adhesive and demineralized dentin by using FE-SEM. The elastic modulus of the treated dentin was measured after BAG-containing dentin adhesive application. The sol–gel-derived BAGs exhibited larger surface areas (by 400–600 times) than conventional BAG, with BAG87 displaying the largest surface area. XRD analysis indicated more pronounced and rapid formation of hydroxyapatite in the sol–gel BAGs. Dentin with BAG87-containing adhesive exhibited the highest elastic modulus. The incorporation of sol–gel-derived BAGs, especially BAG87, into dentin adhesives enhances the remineralization and mechanical properties of adhesive–dentin interfaces. [ABSTRACT FROM AUTHOR]

Tin dioxide plays a crucial role in gas detection, solar cells, and photocatalysis. This study focuses on nanostructured antimony-doped tin dioxide (ATO) synthesized via a modified sol–gel technique under supercritical co-solvent conditions. The crystalline structure and electrical properties were investigated with varying levels of antimony doping (1, 2, and 3 at.%). X-ray diffraction analysis revealed tetragonal rutile structure nanoparticles with sizes ranging from 13 to 22 nm, depending on the doping content. Impedance spectroscopy confirmed its semiconductor behavior, and dc conductivity exhibited a thermal activation, wherein the energy required for conduction progressively increased alongside Sb content. The ac conductivity followed the Jonscher law, dominated by the tunneling hopping mechanism. Nyquist diagrams assessed grain and grain boundary contributions, modeling samples through an equivalent circuit. The dielectric study identified interfacial polarization as the source of dielectric permittivity. The observed behavior of the imaginary component of impedance (Z′′) indicates a dielectric relaxation phenomenon within the sample, with activation energies closely matching those derived from the conductivity study. These findings elucidate the origins of conductivity and active sites in ATO nanoparticles, with deep implications for optoelectronic applications. [ABSTRACT FROM AUTHOR]

Single hollow particles are used in various fields, particularly in thermal insulation materials, owing to their low thermal conductivity attributed to encapsulated air properties. “The self‐assembling phase separated polymer (SaPSeP) method” is an original hollowing method that is proposed by this laboratory 25 years ago. Most hollow particles prepared by the SaPSeP method have carbon, oxygen, and hydrogen polymer shells, which lack sufficient heat resistance. In this study, hollow particles with a silicone shell, which is highly heat‐resistant, are prepared using the SaPSeP method using a trimer of 3‐methacryloxypropylmethyldimethoxysilane (MPDS). The MPDS trimer (3MPDS) is synthesized through the sol–gel reaction of MPDS with a basic aqueous solution. Additionally, hollow particles are prepared using a new silicone oligomer composed of MPDS and dimethoxymethylvinylsilane (DMVS). Both hollow particles prepared from 3MPDS and from a new silicone oligomer composed of MPDS and DMVS showed high heat resistance. They maintained their hollow structure even when exposed to temperatures up to 900 °C. [ABSTRACT FROM AUTHOR]

TiO2:Eu3+ nanoparticles with varying europium concentrations were successfully synthesized via a one-pot sol–gel approach using a molecular heterometallic single-source precursor (SSP) Eu-Ti. For comparison, nanomaterials with similar europium levels were also produced by impregnating europium salts onto the same TiO2 substrate. All the nanomaterials were thoroughly characterized using Eu elemental analysis, powder X-ray diffraction (XRD), scanning (SEM), transmission (TEM), scanning transmission electron microscopy (STEM), Brunauer–Emmett–Teller (BET) analysis, thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, and photoluminescence (PL). This low-temperature synthesis yielded crystalline powders, and calcination at 400 °C was performed to remove surface organic impurities, enabling a precise comparison of the final nanomaterials. While both preparation methods produced materials with similarly dispersed and localized dopants on the TiO2 surface, photoluminescence studies revealed that the SSP-derived nanomaterials exhibited significantly superior electro-optical properties. This enhanced efficiency is attributed to the co-hydrolysis of both reactants, which facilitates an optimized interface between the crystalline TiO2 core and the dopant-rich amorphous surface, thereby enabling far more effective charge transfer than that achieved by impregnation. [ABSTRACT FROM AUTHOR]

The production of materials based on fossil resources is yielding more sustainable and ecologically beneficial methods. Vegetable oils (VO) are one example of base materials whose derivatives rival the properties of their petro‐based counterparts. Gaps exist however and one way to fill them is by employing sol–gel processes to synthesize organic–inorganic hybrid materials, often derived from silane/siloxane compounds. Creating Si─O─Si inorganic networks in the organic VO matrix permits the attainment of necessary strength, among other property enhancements. Consequently, many efforts have been directed to optimally achieve organic–inorganic hybrid materials with VOs. However, compatibilization is challenging, and desirable conditions for matching the inorganic filler in the organic matrix remain a key stumbling block toward wider application. Therefore, this review aims to detail recent progress on these new hybrids, focusing on the main strategies to polymerize and functionalize the raw VO, followed by routes highlighting the addition of the inorganic fillers to obtain desirable composites. [ABSTRACT FROM AUTHOR]

Cobalt ferrite, a prominent magnetic nanomaterial, has attracted huge interest for its exceptional physical and chemical properties. These characteristics make it an ideal candidate for a myriad of advanced applications. Particularly, the properties of cobalt ferrite can be finely tuned by manipulating the cation distribution within its structure. This study explores the impact of substituting Fe3+ ions with rare earth (RE3+) ions—specifically Lanthanum (La), Europium (Eu), Cerium (Ce), and Gadolinium (Gd)—whose ionic radii are larger than that of Fe3+. This replacement, even in minimal amounts, significantly affects the physical and chemical properties of cobalt ferrite, primarily due to induced structural distortions and lattice strain. In the present work, we have doped the ferrite crystal lattice with these rare earth (RE) elements using the sol–gel method. The structural and magnetic properties of the resulting samples are analyzed by different characterization techniques, including powder X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM) complemented by Energy Dispersive X-ray Spectroscopy (EDX), Raman spectroscopy, and Differential Scanning Calorimetry/Thermogravimetric Analysis (DSC/TGA). Additionally, the magnetic properties of the synthesized nanomaterials were evaluated using a Vibrating Sample Magnetometer (VSM). This research reveals a systematic decrease in saturation magnetization values, with pure CFO (CoFe2O4) displaying approximately 74.96 emu/g, and varying reductions observed upon substitution with rare earth (RE) metal ions (La3+, Ce3+, Eu3+, Gd3+; x = 0.0 and 0.1). Furthermore, the introduction of rare earth (La, Gd) dopants correlates with an elevated coercivity (Hc) value, emphasizing the influence on crystal unit symmetry and magneto-crystalline anisotropy. [ABSTRACT FROM AUTHOR]

Multicomponent oxide systems have many applications in different fields such as optics and medicine. In this work, we developed new hybrid photoresists based on a combination of an organic acrylate resin and an inorganic sol, suitable for 3D printing via two-photon polymerization (2PP). The inorganic sol contained precursors of a binary SiO2-CaO or a ternary SiO2-CaO-P2O5 system. Complex microstructures were 3D printed using these hybrid photoresists and 2PP. The obtained materials were characterized using thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM) techniques. Our results revealed that the produced microstructures were able to endure sintering at 700 °C without collapsing, leading to scaffolds with 235 and 355 nm resolution and pore size, respectively. According to the TGA analysis, there was no significant mass loss beyond 600 °C. After sintering at 500 °C, the FTIR spectra showed the disappearance of the characteristic bands associated with the organic phase, and the presence of bands characteristic of the binary and ternary oxide systems and carbonate groups. The SEM images showed different morphologies of agglomerated nanoparticles with mean sizes of about 20 and 60 nm for ternary and binary systems, respectively. Our findings open the way towards precise control of bioglass scaffold fabrication with tremendous design flexibility. [ABSTRACT FROM AUTHOR]

This study aimed to synthesize TiO2 and silver-containing TiO2 layers on Ti6Al4V titanium alloy substrates, also known as titanium grade 5 (TiGr5), to provide corrosion resistance and antibacterial activity. The TiO2 layers were prepared through the sol-gel method and dip-coating technique. Silver introduction into the layers was performed in two different ways. One was the impregnation method by dipping the TiO2 layer-covered metal in aqueous AgNO3 solutions of various concentrations (TiO2/AgNO3), and the other was by direct introduction of AgNO3 into the precursor sol (Ag-TiO2). The two methods for incorporating AgNO3 into the coating matrix are novel, as they preserve silver in its ionic form rather than reducing it to metallic silver. The samples were put through electrochemical characterization, namely potentiodynamic polarization and electrochemical impedance spectroscopy (EIS), and were tested in Hank's solution, simulating a physiological environment. The behavior of the layers was monitored over time. Also, the thin layers' thickness and adhesion to the substrate were determined. Microbiological evaluation of the Ag-doped coatings on glass substrates confirmed their significant bactericidal activity against Gram-negative Escherichia coli. Among the two types of coatings, the impregnated coatings demonstrated the most promising electrochemical performance, as evidenced by both EIS and potentiodynamic polarization analyses. [ABSTRACT FROM AUTHOR]

In this work, a simple sol-gel process method was studied for “one-pot” fabrication of silica particle cross-linked networks (SPCN). It is the first time that the co-precursors of tetraethoxysilane (TEOS) and ?-glycidoxypropyltrimethoxysilane (GPTMS) and capping agent of cetyltrimethylammonium bromide (CTAB) are formulated to achieve the complete co-polymerization of the reaction solution. The reaction solution proposed involved TEOS and GPTMS (5:1 w/w) for feasibility preparation of SPCN. The copolymerization temperature was set at 40? for 24h of aging time. The results indicated that, by means of cetyltrimethylammonium bromide as a capping agent, SPCN exhibited a well-defined three-dimensional (3D) porous network. The prepared SPCN was used for the synthesis of silica monolithic columns to show interstices distributed across the whole SPCN as well as monolithic columns. The BET surface area of the SPCN column was obtained at approximately 156 m2/g and an average pore width smaller than 26 nm.

Comprehensive Summary Hydrazine hydrate (DH) is a widely used chemical agent, but it is highly toxic. Thus, the development of low‐cost and easy‐to‐prepare materials for the detection and adsorption of DH is very significant. Herein, a novel and easy‐to‐prepare supramolecular smart material based on bisquinoline‐functionalized naphthalene diimide (DQ8) has been designed and synthesized. In the DQ8, the synergistic effect between quinoline and naphthalene diimide groups has been employed to improve the selectivity and sensitivity for binding of DH. The DQ8‐based crystalline porous material (DQ8‐CPM) can simultaneously detect and adsorb DH and produce noticeable fluorescence color changes after adsorption of DH vapor. More significantly, the DQ8‐CPM shows nice recycling performance on DH detection and adsorption. Meanwhile, a smart gel based on DQ8 (DQ8‐G) shows multi‐channel response for DH through color, fluorescence, and state changes. The DQ8 shows high selectivity and sensitivity for DH. The detection limit of DQ8 for DH is 8.6 × 10–7 mol/L. According to the investigation of the DH binding and response mechanism, the synergistic effect between quinoline and naphthalene diimide groups plays an important role in the DH response process. It's a simple and feasible way to develop materials for detection and adsorption of DH through synergistic effects. [ABSTRACT FROM AUTHOR]

In recent years, the development of highly sensitive and selective electrochemical sensors has been a pivotal area of research, driven by the growing demand for environmental monitoring and industrial process control. Among various materials investigated for sensor applications, manganese oxide (MnO2) nanoparticles have garnered significant attention due to their excellent electrochemical properties, environmental friendliness, and natural abundance. Critical analyses of the synthesis of MnO2 using different techniques such as hydrothermal method, chemical precipitation, and sol–gel process which allows for the fine-tuning of particle size and morphology while enhancing the electrochemical sensing capabilities have been reviewed. The review also provides a comprehensive overview of the recent advancement evaluation of manganese oxide-based electrodes for detecting sulfonamides and other analytes in water across diverse matrices. This paper sets the stage for a comprehensive exploration of the synthesis methods and application areas of MnO2 nanoparticles in electrochemical sensors, highlighting their role in advancing sensor technology and their impact on various sectors. [ABSTRACT FROM AUTHOR]

ZrN–SiO2 core–shell particles were prepared, where the ZrN core nanoparticles and SiO2 shell were designed to exhibit localized surface plasmon resonances (LSPRs) and structural coloring. The heating of ZrO2 nanoparticles with Mg3N2 under a nitrogen gas flow produced ZrN nanoparticles with a diameter in the range of 10–20 nm. The dispersion of ZrN nanoparticles in water exhibited an absorption maximum at approximately 700 nm owing to LSPRs. An SiO2 shell was formed on the ZrN nanoparticles using a sol–gel process. Scanning transmission electron microscopy confirmed the formation of ZrN–SiO2 core–shell particles containing ZrN particles with a diameter of approximately 10 nm. The SiO2 shell thickness was controlled by varying the reaction time to form SiO2. The use of particles as a structural component of a structural color material owing to the high uniformity of the size of obtained core–shell particles was investigated. The obtained ZrN–SiO2 core–shell particles were arrayed on a glass substrate using a layer‐by‐layer method. The particle‐stacked film of the ZrN–SiO2 core–shell particles exhibited the maximum reflection depending on the particle size of the SiO2 shell. [ABSTRACT FROM AUTHOR]

Recent research has focused on immunotherapy with no side effects as an innovative medical treatment for cancer. However, typical drugs for immunotherapy are very expensive. Here, we propose the use of immunoceramics that activate immune cells by contact with their surface. Previous studies demonstrated that polymers, including the phenylboronic acid group, could activate lymphocytes. This activation may be due to the interaction between the sugar chains in cells and the OH group in B(OH)3 formed via the dissociation of the BO2 group. We have clarified that boron-containing apatite (BAp) activated lymphocytes in vitro. In this study, we fabricated the ceramic surfaces using the CaO-P2O5-SiO2-B2O3 system (CPSB ceramics) containing BAp as a main crystalline phase. The results of the in vitro evaluation indicated that killer T cells in splenocytes cocultured with the CPSB ceramics were more numerous than in splenocytes cocultured on a control surface. The results of the in vivo evaluation indicated that the CPSB ceramics significantly inhibited tumor growth when CD8-positive T cells were cultured on individual ceramics and subsequently injected into tumor-bearing mice. The present CPSB ceramics are expected to be a valuable biomaterial for immunotherapy. [ABSTRACT FROM AUTHOR]

Ho3+ ions doped with ZnS NPs in silicate glasses prepared by room temperature sol–gel method, and its physical parameters and spectroscopic properties were characterized. Structural characterization were performed by XRD, FTIR, SEM, EDX and TEM. ZnS nanoparticles are present in the Ho3+-doped silicate matrix, according to structural investigations. The phenomenological Judd Ofelt intensity parameters Ωλ, which depict the intensities for transitions in lanthanides and actinides in both solids and liquids, follow the pattern Ω2 > Ω4 > Ω6, according to Judd Ofelt analysis of UV–Visible absorption spectra. The study reveals that the four unique PL emission bands of Ho3+ are significantly influences by the concentration of ZnS NPs for enhancing PL emissions is found to be 20 M. This enhancement is ascribed to the modification of the network and sensitization of Ho3+ ions by the presence of the NPs. The photoluminescence spectra of the prepared samples were used to calculate the radiative parameters, such as the stimulated emission cross-section (σp), radiative lifetimes (τR), branching ratio (βR), and transition probability (Aed). CIE color coordinates were computed and they showed the yellow to greenish-yellow region for Ho3+ doped with various ZnS concentration. The present, SHZ20 glass may be useful for the greenish-yellow emitting phosphor application. The result of the Figure of Merit indicate that the prepared glasses show promise for use as optical amplifiers. [ABSTRACT FROM AUTHOR]

Calcium (Ca)-doped zinc oxide (ZnO) with 1 wt.% and 3 wt.% Ca content (CZO_1% and CZO_3%) and pure ZnO (ZO) nanoparticles (NPs) were synthesized using the sol–gel method. The X-ray diffraction (XRD) patterns and transmission electron microscopy (TEM) observations showed that calcium was incorporated in the ZnO lattice, the crystallites were nanometric in size, and the obtained NPs were prismatic in shape with sizes ranging from 40 nm to 60 nm agglomerated microspheres. Poly(3-hexylthiophene-2.5-diyl) (P3HT):ZO (PZO_50, PZO_100, and PZO_150), CZO_1% (PCZO1%_50, PCZO1%_100, and PCZO1%_150), and CZO_3% (PCZO3%_50, PCZO3%_100, and PCZO3%_150) blend thin films were prepared at a ratio from 0 mg to 150 mg. The optical characterization carried out on the P3HT:ZO, P3HT:CZO_1%, and P3HT:CZO_3% layers showed that the incorporation of pure and Ca-doped ZnO NPs had a weak influence on the chain structure and the optical gap of P3HT. The direct-bandgap energy varied with doping from 1.85 to 1.89 for ZO, 1.72 eV to 1.83 eV for PCZO_1%, and 1.69 to 1.80 for PCZO_3%. Organic field-effect transistors (OFETs) based on PZO_50, PZO_100, PZO_150, PCZO1%_50, PCZO1%_100, and PCZO1%_150, PCZO3%_50, PCZO3%_100, and PCZO3%_150 thin films used as active layers were successfully fabricated at low temperature. The electrical characterization of the nine OFETs was performed by comparison in ambient air. The results showed that the PCZO1%_150 exhibited better electrical performance, with saturation mobility (μsat) of 1.3 × 10−3 cm2 V−1 s−1. [ABSTRACT FROM AUTHOR]

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This study aimed to develop a novel ureasil–polyether transdermal hybrid matrix (U-PEO) loaded with Annona muricata concentrated extract (AMCE), which exhibits potent anti-inflammatory activity. The extract was obtained by maceration, a method that allowed for the extraction of a high concentration of flavonoids (39.27 mg/g of extract). In vivo tests demonstrated that 10 mg/kg of AMCE inhibited inflammation for 6 h. The physicochemical characterization of U-PEO with AMCE was conducted via a thermogravimetric analysis (TGA), while its surface was recorded using atomic force microscopy (AFM). The in vitro macroscopic swelling and release tests demonstrated the hydrophilic profile of the material and the percentage of AMCE released. The TGA results demonstrated that the system exhibited physical compatibility due to the thermal stability of U-PEO. Additionally, the AFM analysis revealed a rough and porous surface, with a particular emphasis on the system with AMCE. The release resulted in the liberation of 23.72% of AMCE within 24 h. Finally, the preclinical tests demonstrated that U-PEO with AMCE was also capable of effectively inhibiting inflammation for 6 h, a duration comparable to that of a commercial formulation. The results permit the advancement of the study towards the development of a transdermal system, thereby rendering its application in clinical studies feasible. [ABSTRACT FROM AUTHOR]

This study introduces a novel Fe3O4@SiO2/Ag/AgCl/CdS nanocomposite, designed for the efficient photocatalytic degradation of methyl orange (MO), serving as a proxy for synthetic water pollutants under visible light. A combination of co-precipitation, sol-gel, and photodeposition techniques was used to synthesize the desired nanocomposite. Leveraging the response surface methodology (RSM), we optimized the degradation process, achieving an unprecedented near-complete degradation efficiency of 99% within 90 min. The nanocomposite, characterized by an average diameter of 25 nm and uniform size distribution, demonstrated significant photocatalytic activity and stability, maintaining effectiveness over multiple usage cycles. Notably, the incorporation of Ag/AgCl alongside CdS not only extends the light absorption range but also facilitates charge separation, enhancing photocatalytic performance. Additionally, mineralization was confirmed by measuring the Chemical Oxygen Demand (COD) values. This work not only presents a significant advancement in the field of photocatalyst for water purification but also introduces a scalable and effective approach for the development of next-generation photocatalysts. Our findings highlight the potential of magnetic nanocomposites in environmental remediation, offering a sustainable solution for the degradation of organic pollutants. Highlights: Developed a Fe3O4@SiO2/Ag/AgCl/CdS nanocomposite optimized for visible-light photocatalysis. Achieved 99% methyl orange degradation under visible light in 90 min. Enhanced water purification via magnetic nanocomposites for pollutant degradation. Confirmed stability and sustained efficiency of the photocatalyst over multiple use cycles. Used response surface methodology to optimize photocatalytic conditions efficiently. [ABSTRACT FROM AUTHOR]

The variation of calcium phosphate formation rate on calcium titanate surfaces synthesized via sol-gel (CTSol) and solid-state reaction (CTS-S) at 600 °C for 10 h, were investigated using DSC, FTIR, XRD, DLS-Zeta potential, FESEM-EDS, BET, and ICP-OES, focusing on the relationship between surface morphology and calcium phosphate formation ability. Both powders had meso-porosities with a mean pore diameter of 45 and 54 nm, respectively. While CTSol particles had a diameter of about 100–250 nm, CTS-S had nanosized particles (35–40 nm) with the configuration of parent P25 TiO2. CTS-S had a higher specific surface area (26.14 m2. g−1), pore volume (0.36 cm3.g−1), and pore size (D = 54.51 nm) than CTSol (11.09 m2. g−1, 0.12 cm3.g−1, D = 44.97 nm). By submerging disk-shaped samples in SBF solution, their bioactivity was evaluated for up to 14 days. Both samples formed calcium phosphate at similar rates. Despite having a smaller surface area, CTSol makes up for it with a higher rate of Ca2+ dissolution. Whereas the calcium phosphate initial particles on the surface of CTS-S were spherical, the needle-like features on the surface of CTSol were created by immersion in SBF. Highlights: Two distinct processes were used to create calcium titanate. Two powders represented similar morphologies but different properties. The rate of Calcium Phosphate formation was approximately the same. Various morphologies were observed for the primary nuclei. The MTT evaluation indicated adequate cytocompatibility for powders. [ABSTRACT FROM AUTHOR]

For alumina (Al2O3) powder produced by corrosion of aluminum, we investigated the effect of the solvent composition (C2H5OH/H2O of 100:0, 80:20, 60:40, 40:60, 20:80, and 0:100 v/v) on the particle size distribution. The powders were calcined at 1473K and identified as α-Al2O3. The particle size of alumina powder obtained with H2O as the solvent was 0.3-100 µm. As the volume fraction of H2O in the solvent mixture increased, the particle size of the alumina powder also increased. With the increase in the H2O volume fraction, agglomeration of the obtained alumina particles was observed by scanning electron microscopy. [ABSTRACT FROM AUTHOR]

The aim of this study was to prepare and characterize thin hybrid films on polyurethane-coated knitted fabrics and to achieve satisfactory color fastness to artificial light. Sol–gel-derived hybrid thin films were deposited via the dip-coating of 3-glycidoxypropiltrimethoxysilane. Titanium dioxide (TiO2) and zinc oxide (ZnO) nanopowders were added to compensate for the insufficient aging resistance, which manifests itself in low color fastness and is one of the most frequent complaints from manufacturers of coated marine fabrics (yachts, boats, etc.). The optimum processing conditions were determined by varying the concentration of precursors and auxiliaries, the mass concentration of TiO2 and ZnO nanopowders, the drawing speed, and the methods and process of fabric treatment. The hybrid films were also characterized using scanning electron microscopy and Fourier transform infrared spectroscopy with attenuated total internal reflection, while Spectraflash SF 300 investigated color fastness. After 300 h of exposure in a xenon chamber, the thin hybrid films showed good color fastness and good resistance to washing cycles. The sol–gel treatment proved to be a successful answer to the manufacturers' need for the post-treatment of polyurethane-coated knitted fabrics against UV radiation for use in the marine sector (yachts, speedboats, etc.). [ABSTRACT FROM AUTHOR]

This study aimed to investigate the influence of formulation and process variables on the physicochemical properties and drug release behavior of oxaliplatin (OXP)-loaded ORMOSIL (Organically Modified Silicate) nanoparticles. ORMOSIL nanoparticles were synthesized using sol-gel methods, employing co-condensation (addition of TEOS and APTES at the beginning of the hydrolysis) and post-modification (adding APTES in hydrolyzed silica sol) approaches. Key parameters, pH of the hydrolysis process, water/alkoxide ratio, and preparation method, were systematically explored. The formulations demonstrated average diameter in the range of 111–296 nm, with a unimodal size distribution (PDI). Drug content (DC) ranged 2.42–8.39 µg OXP/mg nanoparticles, and the dissolution pattern was characterized by an initial burst release followed by a slower drug release phase. The post-modification method yielded higher DC, attributed to matrix structure differences which were also validated by distinctive features in FTIR and Raman spectra. XRD and DSC studies demonstrated that OXP was completely entrapped in the silica matrix in its amorphous form, regardless of the preparation method. Further studies were focused on investigating the post-modification method, as it presented more promising formulation properties in regards to the DC. A study design guided by central composite response surface methodology revealed relationships between variables (pH, water, oxaliplatin quantity) and responses (particle size, PDI, DC, zeta potential). Particle sizes ranged from 274 to 2285 nm, PDI from 0.129 to 0.958, DC from 3.81 to 37.08 µg OXP/mg NPs, with positive zeta potential (0.83–28.3 mV). The PLS exploratory multivariate statistical analysis highlighted an increase in particle size and PDI under acidic pH and a positive correlation between OXP quantity and DC and inverse relationship between water quantity and nanoparticle zeta potential. [ABSTRACT FROM AUTHOR]

Currently, zirconium oxide (ZrO 2 , also called zirconia) is used for restoration or as an implant in dentistry due to its properties and the aesthetics that can be achieved. In the present work, zirconia particles were obtained by the sol-gel method using acid or basic medium to study its influence on the nucleation and growth of the particle size and determine the crystallite size of the high-temperature phase. Also, to control the particle size and improve the solubility and dispersion of the colloidal particles resulting from the hydrolysis-condensation reactions, a mixture of alcohol of different chain lengths were used. The zirconia samples were heat treated at 400, 600, and 800 °C and up to 250 h of holding times to follow the growth of crystallite size of zirconia phases. The results showed tetragonal (ZrO 2 -t) and monoclinic (ZrO 2 -m) zirconia as predominant phases, regardless of the synthesis conditions and heat treatment used. The monoclinic phase is favored at elevated temperatures and prolonged holding times, while the tetragonal ones are favored at low temperatures. The holding time promotes the transformation from the tetragonal to the monoclinic phase in both media (acid and basic). However, this transformation is promoted by the basic catalyst, while the acid medium favors the stability of the tetragonal phase at 400 and 600 °C. The phase transformation, particle size, and crystallite size depend on the synthesis conditions and heat treatment used to obtain the zirconia particles. [ABSTRACT FROM AUTHOR]

Tin dioxide (SnO2) possesses remarkable optical and electrical properties and finds applications in a diverse array of devices, including supercapacitors, gas sensors, batteries, and solar cells. Enhancing SnO2's optoelectronic characteristics can substantially improve the functionality of devices incorporating this material. In this research endeavor, we synthesized tin oxide nanoparticles doped with fluorine (F-SnO2) using the modified sol-gel method. Our results underscore the affirmative impact of fluorine incorporation of SnO2's optoelectronic properties. Strikingly, this doping procedure left the morphology and structure of the nanoparticles untouched, but it did induce changes in particle size. Notably, the reduction in bandgap from 3.87 eV for SnO2 to 3.70 eV for F-SnO2 nanoparticles suggests the generation of new energy levels below the conduction band due to doping. Electrical transport assessments using impedance spectroscopy revealed the semiconducting behavior of the samples. The Nyquist diagram was instrumental in evaluating the role of grain and grain boundaries, and an equivalent circuit was employed for sample modeling. Conductivity showed temperature dependency, displaying Mott's variable range hopping conduction mechanism at lower temperatures and small polaron hopping at higher temperatures. Moreover, the introduction of fluorine ions leads to an increase in conductance and decrease the resistance.Dielectric analysis identified polarization as the main factor behind the dielectric loss tangent. The dielectric constant and tan δ show typical behavior by decreasing with increasing frequency. These observations align with the Maxwell–Wagner model. The dielectric loss coupled with high permittivity values, render F-SnO2 a promising compound for energy storage. These findings underscore the potential of F-SnO2 nanoparticles to enhance the performance of SnO2-based devices across a diverse spectrum of applications. Highlights: Preparation of fluorine-doped tin dioxide (F-SnO2) nanopowders via sol-gel method. Morphological and structural analysis revealed polycrystalline structure with tetragonal rutile phase. Adjustable optical capabilities demonstrated through doping. Electrical properties confirmed semiconductor behavior of F-SnO2. Dielectric behavior explained by relaxation effect and interfacial polarization, following the Maxwell–Wagner model. [ABSTRACT FROM AUTHOR]

To overcome limitations of dentin bonding due to collagen degradation at a bonded interface, incorporating bioactive glass (BAG) into dentin adhesives has been proposed to enhance remineralization and improve bonding durability. This study evaluated sol–gel-derived BAGs (BAG79, BAG87, BAG91, and BAG79F) and conventional melt-quenched BAG (BAG45) incorporated into dentin adhesive to assess their remineralization and mechanical properties. The BAGs were characterized by using field-emission scanning electron microscopy (FE-SEM) and transmission electron microscopy for surface morphology. The surface area was measured by the Brunauer–Emmett–Teller method. X-ray diffraction (XRD) analysis was performed to determine the crystalline structure of the BAGs. Adhesive surface analysis was performed after approximating each experimental dentin adhesive and demineralized dentin by using FE-SEM. The elastic modulus of the treated dentin was measured after BAG-containing dentin adhesive application. The sol–gel-derived BAGs exhibited larger surface areas (by 400–600 times) than conventional BAG, with BAG87 displaying the largest surface area. XRD analysis indicated more pronounced and rapid formation of hydroxyapatite in the sol–gel BAGs. Dentin with BAG87-containing adhesive exhibited the highest elastic modulus. The incorporation of sol–gel-derived BAGs, especially BAG87, into dentin adhesives enhances the remineralization and mechanical properties of adhesive–dentin interfaces.

In this study, the synthesis of Fe3O4/PANI nanocomposites is achieved by employing a spin coating technique, which involves the initial preparation of Fe2O3 from iron sand through magnetic separation and ball milling. The Fe3O4 precursor is then combined with polyaniline (PANI) at different concentrations (30%, 40%, 50%, 60%, and 70%) using a sol-gel process. The resulting Fe3O4/PANI gel mixture is spin-coated onto glass substrates and dried. The nanocomposite films undergo extensive characterization through X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Vibration Sample Magnetometry (VSM), and electrical measurements using an LCR meter. Our findings show a correlation between Fe3O4 concentrations and crystal size, observed as a decrease from 30% to 40%, an increase at 50%, and a subsequent decrease from 60% to 70%. Fouriertransform infrared spectroscopy (FTIR) confirms the chemical bonding between Fe3O4 Fe2O3 and PANI. SEM images reveal the layer thickness varies with concentration, measured as 5.02 µm, 16.54 µm, 17.82 µm, 19.36 µm, and 24.4 µm, respectively. Electrical properties indicate resistance values of 7.36 mΩ, 8.388 mΩ, 8.101 mΩ, 8.53 mΩ, and 3.53 mΩ for the respective Fe3O4 concentrations, with corresponding capacitance values. This study elucidates the structural and electrical properties of Fe3O4/PANI nanocomposites, highlighting their potential for diverse applications. [ABSTRACT FROM AUTHOR]

In this work, we report on the optical properties of europium-doped SrTiO 3 , synthesized in situ via the sol-gel method as nanopowders and sintered ceramic bulks by heat treatment in vacuum. The structure and morphology of the Sr 1-3x/2 Eu x TiO 3 (x = 0.01–0.07) nanopowders and ceramics, concerning to the europium concentration, were characterized by X-ray powder diffraction, field emission scanning electron microscopy, and transmission electron microscopy. The optical properties of as-prepared materials were also investigated. These analyses demonstrated that a temperature of 1425 °C in a vacuum of 10−4 Pa and a plateau of 4h are the optimal sintering conditions for Sr 1-3x/2 Eu x TiO 3 ceramics. Eu3+ doped SrTiO 3 ceramics exhibit visible red photoluminescence characteristics. The emission of SrTiO 3 :Eu3+ phosphor with different amounts of Eu3+, excited by 395 nm and 465 nm light, was studied. The emission spectra exhibit characteristic luminescence from 5D 0 → 7F j (j = 0, 1, 2, 3, 4) intra-4f shell Eu3+ ion transitions. The most intense transitions are 5D 0 → 7F 1 (591 nm) for pumping at 395 nm and, 5D 0 → 7F 2 (615 nm) at 465 nm. The corresponding coordinates CIE for the Eu-doped SrTiO 3 samples were calculated from the emission spectra obtained at 395 nm and 465 nm excitation wavelengths. This study demonstrates that the original protocol of materials engineering used is a simple and efficient method for manufacturing novel nanophosphors with enhanced reddish-orange emission. The as-obtained results indicated that the sol-gel synthesis combined with the sintering process in a vacuum at an appropriate temperature, plateau, could be a novel way to fabricate materials based on strontium titanate with reasonable optical properties. [ABSTRACT FROM AUTHOR]

New polysilsesquioxane (PSQ)-based CO2 separation membranes with succinic anhydride and monoalkylurea units as thermally degradable CO2-philic units were prepared by the copolymerization of a 1:1 mixture of [3-(triethoxysilyl)propyl]succinic anhydride (TESPS) or [3-(triethoxysilyl)propyl]urea (TESPU) and bis(triethoxysilyl)ethane (BTESE). The succinic anhydride and monoalkylurea units underwent thermal degradation to form ester and dialkylurea units, respectively, with the liberation of small molecules (e.g., CO2 and NH3) under N2 atmosphere. The effects of thermal degradation on the performance of the obtained membranes were investigated. The TESPS-BTESE- and TESPU-BTESE-based membranes calcined at 250 °C and 200 °C exhibited good CO2/N2 permselectivities of 20.2 and 14.4, respectively, with CO2 permeances of 7.7 × 10−8 and 7.9 × 10−8 mol m−2·s−1·Pa−1, respectively. When the membranes were further calcined at elevated temperatures of 350 °C and 300 °C, respectively, to promote the thermal degradation of the organic units, the CO2 permeances increased to 1.3 × 10−7 and 1.2 × 10−6 mol m−2·s−1·Pa−1 (3.9 × 102 and 3.6 × 103 GPU), although the CO2/N2 permselectivities decreased to 19.5 and 8.4, respectively. These data indicate that the controlled thermal degradation of the organic units provides a new methodology for possible tuning of the CO2 separation performance of PSQ membranes. [ABSTRACT FROM AUTHOR]

Silica-based materials modified with maize stalks were synthesized using different sol-gel routes (acid-catalyzed route, base-catalyzed route, acid-catalyzed followed by base-catalyzed (two steps) hydrolytic route, and FeCl3-catalyzed nonhydrolytic route). The porogenic role of maize stalks as templates was evaluated by comparing the effects of thermal and ultrasonic extraction methods. The resulting adsorbents were characterized via a set of complementary techniques, including nitrogen adsorption/desorption (BET), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and elemental analysis (CHN). The texture, structure, and morphology of the resulting materials were shown to be dependent on the synthesis route. The sorbent material produced via the two-step route followed by ultrasound extraction had the highest adsorption capacity, which allowed the removal of 28% (q = 0.84 mg g−1) of the phenol from the aqueous solution. [ABSTRACT FROM AUTHOR]

The publication presents general information on calcium zirconate and the physical/chemical properties of products based on it. Methods for CaZrO3 production, such as solid phase synthesis, electric arc fusion, codeposition, hydrothermal synthesis, etc. are studied. [ABSTRACT FROM AUTHOR]

Curcumin (CUR) is a natural compound that can be combined with miconazole (MCZ) to improve vulvovaginal candidiasis (VVC) caused by Candida albicans treatment's efficacy. This study aimed to develop ureasil–polyether (U-PEO) vaginal ovules loaded with CUR and MCZ for the treatment of VVC. Physicochemical characterization was performed by thermogravimetry (TGA), differential thermal analysis (DTA), Fourier transform infrared spectroscopy (FTIR), and in vitro release. Antifungal assays were used to determine minimum inhibitory concentrations (MICs) and synergism between CUR and MCZ, and the activity of U-PEO ovules were performed by microdilution and agar diffusion. TGA results showed high thermal stability of the hybrid ovules. In DTA, the amorphous character of U-PEO and a possible interaction between CUR and MCZ were observed. FTIR showed no chemical incompatibility between the drugs. In vitro release resulted in 80% of CUR and 95% of MCZ released within 144 h. The MICs of CUR and MCZ were 256 and 2.5 µg/mL, respectively. After combining the drugs, the MIC of MCZ decreased four-fold to 0.625 µg/mL, while that of CUR decreased eight-fold to 32 µg/mL. Synergism was confirmed by the fractional inhibitory concentration index (FICI) equal to 0.375. U-PEO alone showed no antifungal activity. U-PEO/MCZ and U-PEO/CUR/MCZ ovules showed the greatest zones of inhibition (≥18 mm). The results highlight the potential of the ovules to be administered at a lower frequency and at reduced doses compared to available formulations. [ABSTRACT FROM AUTHOR]