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3. Nanophotonic biosensors

Author

Iqbal, Muhammad Aamir, primary, Anwar, Nadia, additional, Ahmed, Muqarrab, additional, Javeed, Saher, additional, Anwar, Bushra, additional, Ahmad, Raice, additional, Capangpangan, Rey Y., additional, and Alguno, Arnold C., additional

Published
2024
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15. Sequestration of Methylene Blue Dye in a Fixed-Bed Column Using Activated Carbon-Infused Polyurethane Composite Adsorbent Derived from Coconut Oil.

Author

Estrada, Renz John R., Tomon, Tomas Ralph B., Fernandez, Rubie Mae D., Omisol, Christine Joy M., Dumancas, Gerard G., Alguno, Arnold C., Ramos, Maria Sheila K., Malaluan, Roberto M., and Lubguban, Arnold A.

Abstract

In this research, a new method of treating wastewater is introduced using a highly recyclable and sustainable material derived from coconut oil. This material aims to address the issues commonly faced by conventional sorbents, such as limited performance and costly production. These challenges impede a sorbent material from unlocking its full utility in treating wastewater. An exceptional sorbent material was synthesized by incorporating coconut shell-based activated carbon (AC) into a coconut oil-based polyurethane matrix to produce an activated carbon-infused polyurethane (ACIP). The effective adsorption was elucidated by the synergistic interaction between the ACIP material and methylene blue (MB) through electrostatic attraction, π-π interactions, and hydrogen bonding. To provide an exhaustive analysis of the ACIP material, several analytical techniques were employed, including Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM) analysis, X-ray diffraction (XRD) analysis, and thermogravimetric analysis (TGA). A detailed assessment using a fixed-bed column setup investigated its adsorption behavior by encompassing various factors such as inlet concentration, adsorbent bed height, feed flow rate, and solution pH. Results revealed that the ACIP composite exhibited a maximum adsorption capacity of 28.25 mg g−1. Empirical evidence with a high correlation coefficient (R2 > 0.93) obtained from the Thomas and Yoon–Nelson model suggests the suitability of the composite material to operate efficiently under these diverse circumstances. Notably, after five consecutive adsorption–desorption cycles, ACIP demonstrated its remarkable reusability by maintaining 86% of its regeneration efficiency. Given its outstanding performance and potential for scalability, this innovative ACIP composite presents a more sustainable approach to addressing wastewater issues within industrial environments. [ABSTRACT FROM AUTHOR]

Published
2024
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16. Upcycling PVC and PET as Volume-Enhancing Functional Fillers for the Development of High-Performance Bio-Based Rigid Polyurethane Foams.

Author

Ochigue, Princess Claire D., Dingcong Jr., Roger G., Bondaug, John Christian S., Magalong, Brian Christian G., Dumancas, Gerard G., Gutierrez, Carlo S., Alguno, Arnold C., Malaluan, Roberto M., Lubguban, Arnold A., and Bacosa, Hernando P.

Abstract

Polyvinyl chloride (PVC) and polyethylene terephthalate (PET) contribute significantly to global plastic waste, with only 9% recycled in recent years. In this work, these plastic wastes were upcycled as functional fillers to improve the rigid polyurethane foam (RPUF) properties. To attain this target, we leveraged the intrinsic polarity of the C=O and C-Cl groups of PVC and PET to induce intermolecular attractions with the N-H groups of the polyurethane matrix, evidenced by the observed IR peak shifts. This enhanced the nucleating effect during foaming, increasing the foams' compressive strengths by 77% and 22% with the addition of 10% PVC and 5% PET filler, respectively. Furthermore, the addition of PVC and PET fillers increased the foam volume. Thus, the collective utilization of PPW and its corresponding impact on the CO-based RPUF's properties signifies a reduction in carbon dioxide emissions by 14.15% and 17.52% for PVC and PET, respectively. Moreover, thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) revealed improved thermal stability and degradation profiles of the produced RPUFs. Overall, this work highlights potential advancement in environmentally responsible upcycling strategies for common end-of-life plastic wastes, while enhancing rigid foam properties. [ABSTRACT FROM AUTHOR]

Published
2024
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19. Elucidating the Impact of Polyol Functional Moieties on Exothermic Poly(urethane-urea) Polymerization: A Thermo-Kinetic Simulation Approach

Author

Mendija, Leanne Christie C., primary, Dingcong, Roger G., additional, Alfeche, Fortia Louise Adeliene M., additional, Al-Moameri, Harith H., additional, Dumancas, Gerard G., additional, Tan, Noel Peter B., additional, Malaluan, Roberto M., additional, Alguno, Arnold C., additional, and Lubguban, Arnold A., additional

Published
2024
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20. Facile Synthesis of Band Gap-Tunable Kappa-Carrageenan-Mediated C,S-Doped TiO2 Nanoparticles for Enhanced Dye Degradation

Author

Erjeno, Daisy Jane D., primary, Asequia, Dan Michael A., additional, Osorio, Carlo Kurt F., additional, Omisol, Christine Joy M., additional, Etom, Andrei E., additional, Hisona, Renzo Miguel R., additional, Tilendo, Amierson C., additional, Triana, Ann Pearl G., additional, Dumancas, Gerard G., additional, Zoleta, Joshua B., additional, Alguno, Arnold C., additional, Malaluan, Roberto M., additional, and Lubguban, Arnold A., additional

Published
2024
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21. Dopamine-Functionalized Gold Nanoparticles for Colorimetric Detection of Histamine

Author

Unabia, Romnick B., primary, Reazo, Renzo Luis D., additional, Rivera, Rolen Brian P., additional, Lapening, Melbagrace A., additional, Omping, Jahor L., additional, Lumod, Ryan M., additional, Ruda, Archie G., additional, Sayson, Noel Lito B., additional, Dumancas, Gerard, additional, Malaluan, Roberto M., additional, Lubguban, Arnold A., additional, Petalcorin, Gaudencio C., additional, Capangpangan, Rey Y., additional, Latayada, Felmer S., additional, and Alguno, Arnold C., additional

Published
2024
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27. Vodcast as ideating medium in STEM lesson plan in teaching heat transfer.

Author

Guden, Jester Mark, Alguno, Arnold C., Sayson, Noel Lito B., Magsayo, Joy R., and Malayao Jr., Sotero O.

Subjects
HEAT transfer, STEM education, LESSON planning, SCAFFOLDED instruction, VIDEO blogs
Abstract

This study attempts to link the clay soil in the locality to the topic of heat transfer as a contextualization point. It attempted to slightly modify the seven-step science, technology, engineering, and mathematics (STEM) lesson by having the part of the prototyping be first tried by the teacher, thereby having a change-of-hat to anticipate the ‘what if’ questions of the students. The teacher-researcher experimentation provided critical information to scaffold the students in the prototyping part. The evaluation of experts shows that the modified STEM lesson can be an excellent tool and the vodcast has been found to be a very satisfactory component of the STEM lesson. It is described as a very useful material in teaching heat transfer and related thermodynamics concepts and is highly recommended for use in both distance learning and face-to-face modality. Further, the clay oven exploration has come up with a refined clay oven production process, wherein the clay oven prototype has the capacity for the contextualization of heat transfer. It is recommended that a formal implementation be conducted to refine and standardize the lesson delivery [ABSTRACT FROM AUTHOR]

Published
2024
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28. Development of High-Performance Coconut Oil-Based Rigid Polyurethane-Urea Foam: A Novel Sequential Amidation and Prepolymerization Process

Author

Hipulan, Louell Nikki A., primary, Dingcong, Roger G., additional, Estrada, Dave Joseph E., additional, Dumancas, Gerard G., additional, Bondaug, John Christian S., additional, Alguno, Arnold C., additional, Bacosa, Hernando P., additional, Malaluan, Roberto M., additional, and Lubguban, Arnold A., additional

Published
2024
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35. Anti-Corrosion Properties of Polyaniline/Polyurethane Composite Coatings on Mild Steel Using Coconut-Based/PPG Blend Polyols

Author

Bonilla, Marjune Tamayo, primary, Ruda, Archie Gomera, additional, Estrada, Dave Joseph E., additional, Ubas, Kurt Sterling M., additional, Mutia, Aaron Andrew B., additional, Lubguban, Arnold A., additional, Capangpangan, Rey Y., additional, Labis, Joselito P., additional, Tilendo, Amierson C., additional, Sayson, Noel Lito B., additional, and Alguno, Arnold C., additional

Published
2023
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38. Experimental Design and Breakthrough Curve Modeling of Fixed-Bed Columns Utilizing a Novel 3D Coconut-Based Polyurethane-Activated Carbon Composite Adsorbent for Lead Sequestration

Author

Fernandez, Rubie Mae D., primary, Estrada, Renz John R., additional, Tomon, Tomas Ralph B., additional, Dingcong, Roger G., additional, Amparado, Ruben F., additional, Capangpangan, Rey Y., additional, Malaluan, Roberto M., additional, Dumancas, Gerard G., additional, Lubguban, Alona A., additional, Alguno, Arnold C., additional, Bacosa, Hernando P., additional, and Lubguban, Arnold A., additional

Published
2023
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39. Removal of Pb2+ from Aqueous Media by Adsorption onto a Novel Coconut-Based Polyurethane-Activated Carbon Composite in a Fixed-Bed Column: Experimental Design and Breakthrough Curves Modelling

Author

Fernandez, Rubie Mae D., primary, Estrada, Renz John R., additional, Tomon, Tomas Ralph B., additional, Dingcong, Roger Jr. G., additional, Amparado Jr., Ruben F., additional, Capangpangan, Rey Y., additional, Malaluan, Roberto M., additional, Dumancas, Gerard G., additional, Lubguban, Alona A., additional, Alguno, Arnold C., additional, Bacosa, Hernando P., additional, and Lubguban, Arnold A., additional

Published
2023
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40. Enhancing thermoelectric properties of CuNiO thin films through post-annealing: Effect on Seebeck coefficient and power generation

Author

Yasir Ali, M., primary, Almufarij, Rasmiah S., additional, Ashfaq, Arslan, additional, Ali Shokralla, Elsammani, additional, Alsalmah, Hessa A., additional, Capangpangan, Rey Y., additional, Alguno, Arnold C., additional, Macadangdang Jr., Romulo R., additional, Ragab, Ahmed H., additional, Trabelsi, Youssef, additional, and Ali, Adnan, additional

Published
2023
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43. Production of Bio-Based Polyol from Coconut Fatty Acid Distillate (CFAD) and Crude Glycerol for Rigid Polyurethane Foam Applications

Author

Salcedo, Ma. Louella D., primary, Omisol, Christine Joy M., additional, Maputi, Anthony O., additional, Estrada, Dave Joseph E., additional, Aguinid, Blessy Joy M., additional, Asequia, Dan Michael A., additional, Erjeno, Daisy Jane D., additional, Apostol, Glenn, additional, Siy, Henry, additional, Malaluan, Roberto M., additional, Alguno, Arnold C., additional, Dumancas, Gerard G., additional, and Lubguban, Arnold A., additional

Published
2023
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45. TiO2- Polyurethane Cocopol Blend Nanocomposites as an Anticorrosion Coating for Mild Steel

Author

Ruda, Archie Gomera, Bonilla, Marjune Tamayo, Ubas, Kurt Sterling M., Tilendo, Amierson C., Estrada, Dave Joseph E., Capangpangan, Rey, Cumba, Rey Marc T., Labis, Joselito P., Sayson, Noel Lito B., and Alguno, Arnold C.

Abstract

Mild steels were the most frequently used materials in industries and factories since it possesses unique properties but due to weak environmental changes, these cause deterioration and corrosion to the materials’ surface. To prevent such, protective coatings were applied to protect against corrosion in which by incorporating titanium nanoparticles in polyurethane coatings. Titanium nanoparticles were synthesized using titanium butoxide as a precursor. The obtained nanoparticles were used as an inhibitor mixed with coconut oil-based polyurethane polyol blend against the corrosion on mild steel of 3.5% of sodium chloride solution which has been investigated using the Tafel polarization technique. The polarization curves of the corrosion potential for bare mild steel, along with different amounts of titanium nanoparticles coating, exhibit a positive shift. This shift indicates that the coating film effectively reduces the transport path for the corrosive solution, providing a protective barrier against corrosion. This observation is further supported by the results of the adhesive strength test, which demonstrates that the attachment of the coating films to the metal increases with higher amounts of titanium nanoparticles. This indicates improved adhesion and a stronger bond between the coating and the substrate, enhancing the overall corrosion resistance. The increase of contact angle test confirms the improvement of the coating’s hydrophobicity with the addition of titanium nanoparticles. This suggests that the coating repels water more effectively, further contributing to its protective properties against corrosion. Results also show that the addition of 4wt% of titanium nanoparticles has better anti-corrosion properties than the PU CCP alone, and 0.5, 1.0, and 2.0wt% of titanium added.

Published
2024
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48. Basic Concepts, Advances and Emerging Applications of Nanophotonics

Author

Aamir Iqbal, Muhammad, primary, Malik, Maria, additional, Anwar, Nadia, additional, Bakhsh, Sunila, additional, Javeed, Saher, additional, Sarah Maidin, Siti, additional, Morsy, Kareem, additional, Capangpangan, Rey Y., additional, Alguno, Arnold C., additional, and Ryeol Choi, Jeong, additional

Published
2023
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