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Your search keyword '"Fathi, Mohammadhossein"' showing total 178 results
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178 results on '"Fathi, Mohammadhossein"'

32. Combinatorial fluorapatite-based scaffolds substituted with strontium, magnesium and silicon ions for mending bone defects

Author

Orthopaedie Onderzoek, Other research (not in main researchprogram), Golafshan, Nasim, Alehosseini, Morteza, Ahmadi, Tahmineh, Talebi, Ardeshir, Fathi, Mohammadhossein, Kharaziha, Mahshid, Orive, Gorka, Castilho, Miguel, Dolatshahi-Pirouz, Alireza, Orthopaedie Onderzoek, Other research (not in main researchprogram), Golafshan, Nasim, Alehosseini, Morteza, Ahmadi, Tahmineh, Talebi, Ardeshir, Fathi, Mohammadhossein, Kharaziha, Mahshid, Orive, Gorka, Castilho, Miguel, and Dolatshahi-Pirouz, Alireza

Published
2021

37. Synthesis and thermal shock evaluation of porous SiC ceramic foams for solar thermal applications

Author

Parvanian, A.M., Salimijazi, Hamidreza, Fathi, Mohammadhossein, Saadatfar, Mohammad, Parvanian, A.M., Salimijazi, Hamidreza, Fathi, Mohammadhossein, and Saadatfar, Mohammad

Abstract

Reticulated porous ceramics with structural features spanning across multiple length scales are emerging as the primary media in a variety of demanding mass and heat transfer applications, most notably solar‐assisted synthetic fuel processing. In this study, we focus on engineering of the open pore silicon carbide (SiC)‐based foams in such catalytic applications. We evaluate the mechanical integrity and thermal stability of these porous structures. X‐ray tomography analyses of the 3D structures reveal the presence of dual pore size distribution different by up to an order of magnitude in length scale. We further study the effect of thermal shock—induced via water quenching—on the SiC structures and we conclude that the mechanical properties of the ceramic foams are significantly reduced after thermal stress. Comparison of SEM micrographs—before and after thermal shock—reveals that needle‐like features appear inside the foam matrix. These elongated defects may be responsible for structural and mechanical weakening.

Published
2019

40. Formulation of electrospun Mg‐FA/poly (ε‐caprolactone) nanocomposite to adjust bioactivity, biodegradability, and cellular interactions.

Author

Fereshteh, Zeinab, Fathi, Mohammadhossein, Kargozar, Saeid, and Samadikuchaksaraei, Ali

Subjects
POLYCAPROLACTONE, WEIGHT gain, NANOCOMPOSITE materials, TISSUE engineering, BODY fluids, FLUORAPATITE
Abstract

Adjusting the biological properties of scaffolds is one of the most challenging issues in tissue engineering. Here, we focus on formulating a nanocomposite with tunability for bioactivity, biodegradability, and cellular interactions by using different nanoparticles composition and concentration. Here, after optimizing Mg+2 ions concentration in fluorapatite nanoparticles (Mg‐FA NPs), we probed the influence of Mg‐FA NPs on the biological properties of the electrospun Mg‐FA/poly (ε‐caprolactone). Increasing Mg‐FA nanoparticles up to 15 wt% in the composite could enhance the bioactivity from 0.02 wt% in the pure PCL scaffold up to 3 wt% (150 times more) by gaining weight after 28‐day incubation in simulated body fluid (SBF) at 37°C. In the same order, the biodegradation of scaffolds accelerated from 3.1 wt% to 34.6 wt% (11 times more). The cell attachment assays, using MG‐63, showed that the presence of Mg‐FA NPs plays a crucial role to attach cells on the surface by improving wettability as well as biocompatibility. Also, the Mg‐FA NPs encouraged MG‐63 cells to proliferate on/inside the scaffolds and generate 3D cell networks. [ABSTRACT FROM AUTHOR]

Published
2021
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42. The electrospun poly(ε‐caprolactone)/fluoridated hydroxyapatite nanocomposite for bone tissue engineering.

Author

Johari, Narges, Fathi, Mohammadhossein, Fereshteh, Zeinab, Kargozar, Saeid, and Samadikuchaksaraei, Ali

Subjects
POLYCAPROLACTONE, BONES, TISSUE engineering, FOURIER transform infrared spectroscopy, GUIDED bone regeneration, TENSILE tests
Abstract

Biodegradable cell‐incorporated scaffolds can guide the regeneration process of bone defects such as physiological resorption, tooth loss, and trauma which medically, socially, and economically hurt patients. Here, 0, 5, 10, and 15 wt% fluoridated hydroxyapatite (FHA) nanoparticles containing 25 wt% F− and 75 wt% OH− were incorporated into poly(ε‐caprolactone) (PCL) matrix to produce PCL/FHA nanocomposite scaffolds using electrospinning method. Then, scanning electron microscopy (SEM), X‐ray diffraction (XRD) pattern, and Fourier transform infrared spectroscopy (FTIR) were used to evaluate the morphology, phase structure, and functional groups of prepared electrospun scaffolds, respectively. Furthermore, the tensile strength and elastic modulus of electrospun scaffolds were investigated using the tensile test. Moreover, the biodegradation behavior of electrospun PCL/FHA scaffolds was studied by the evaluation of weight loss of mats and the alternation of pH in phosphate buffer saline (PBS) up to 30 days of incubation. Then, the biocompatibility of prepared mats was investigated by culturing MG‐63 osteoblast cell line and performing MTT assay. In addition, the adhesion of osteoblast cells on prepared electrospun scaffolds was studied using their SEM images. Results revealed that the fiber diameter of prepared electrospun PCL/FHA scaffolds alters between 700 and 900 nm. The mechanical assay illustrated the mat with 10 wt% FHA nanoparticles revealed the highest tensile strength and elastic modulus. The weight loss alternation of mats determined around 1% to 8% after 30 days of incubation. The biocompatibility and cell adhesion of mats improved by increasing the amounts of FHA nanoparticles. [ABSTRACT FROM AUTHOR]

Published
2020
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