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23. Halloysite Nanotube (HNT) Dispersion Stability in 10% Ethanol-Water Mixture and Water

Author

Dilidili, Aaron Zaeh F., Habiling, Jhoneliza B., Maglalang, Paul Eric C., and Millare, Jeremiah C.

Abstract

This study investigates Halloysite Nanotube (HNT) dispersibility in ethanol-water mixtures – 0% and 10% ethanol at 100, 300, and 500 ppm HNT concentrations. Overall, the study finds that changes in HNT concentration linearly affect the response variables and showed that the 10% ethanol solvent has a higher zeta potential, smaller particle size, higher viscosity, and settling velocity. The enlargement of HNT particles at 10% ethanol while keeping better stability than water solvent is unexpected and can open novel studies about the dispersion of HNT in this solvent system.

Published
2024
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24. Comparison of Organic and Inorganic - Modified Halloysite Nanotube for Improved Drug Delivery of Aspirin

Author

Piolo, Kryzel Maire E., Samonte, Cristella Andrea J., Emolaga, Carlo S., and Millare, Jeremiah C.

Abstract

Halloysite nanotubes (HNTs), the naturally formed mineral clays with hollow tubular structures, have found promising applications as nanocarriers for drug delivery systems due to their biocompatibility and nontoxicity. By modifying the lumen of HNT, drug delivery of various types of sensitive and low-dissolution drugs could be enhanced. This study presents a comparison of the properties of modified HNTs containing an organic modifier (Sodium Laureth Sulfate, SLES) and an inorganic modifier (Sodium Thiosulfate, STS) as carriers of a slightly water-soluble drug, aspirin. HNTs modified by STS showed higher negative zeta potential than those modified by SLES, indicating that STS-modified HNTs are relatively more stable. The negative zeta potential of STS-modified HNT however decreased upon aspirin loading while that of SLES-modified HNT increased, implying that aspirin interacts with the modifiers differently. In terms of drug release, both modified HNTs showed an improved aspirin release rate compared with pure HNT. Moreover, the STS-modified HNT showed a higher aspirin release (21.5%) in the first hour but the SLES-modified HNT showed the highest cumulative release of 62.5% after 6 hours. These results therefore show that the developed modified HNTs improve the release of aspirin and demonstrate how the nature of the modifier (organic or inorganic) on the HNT lumen affects the behaviour of the drug release of aspirin. This also gives an avenue for modulating drug release based on certain requirements such as time and quantity of drug released.

Published
2024
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25. Effects of Halloysite Nanotube (HNT) on the Cd2+ Adsorption Capacity of Cellulose Acetate (CA) Thin Film Membranes

Author

Llana, Marlon J., Tabucan, Kyrien Jewel Janeena L., Cosico, John Alec Mari C., Maglalang, Paul Eric C., and Millare, Jeremiah C.

Abstract

This paper aims to investigate the effects of adding and increasing the concentration of halloysite nanotube (HNT) to a cellulose acetate (CA) membrane which is produced through non-solvent-induced phase separation via hand casting. Different characterization tests are performed on the nanocomposite samples: Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM), Fourier Transform Infrared Spectroscopy (FTIR), and Atomic Absorption Spectroscopy (AAS). The addition of the filler itself increases the presence of peaks and valleys on the surface of the nanocomposite membrane. The 5% HNT nanocomposite membrane has the largest peaks and valleys-both in size and number. Using the following contact times: 2, 4, and 6 hours, the adsorption capacity of the CA-HNT membranes is obtained with the aid of AAS results. The 5% HNT sample leads to a nanocomposite membrane with a higher adsorption capacity relative to that of a pure CA membrane.

Published
2024
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26. Mn2+ Adsorption on Nanozeolite: Determination of Thermodynamic Properties Using Isothermal Titration Calorimetry

Author

Dineros, Rochelle P., Labrador, Benjo C., Ustaris IV, Conrado Miguel L., Maglalang, Paul Eric C., and Millare, Jeremiah C.

Abstract

This study investigates the thermodynamics of manganese ion adsorption on nanozeolite to assess the nanomaterial’s heavy metal removal efficiency from surface water, industrial water, and groundwater. Using Isothermal Titration Calorimetry (ITC), the thermodynamic profile of nanozeolite is obtained, demonstrating a low equilibrium binding affinity. The thermodynamic signature showed favorable binding mechanisms, primarily from the change of entropy, suggesting spontaneous reactions. Meanwhile, the enthalpy change of adsorption increases as temperature rises, while ∆G and T∆S decrease. Using proper thermodynamic conditions, nanozeolite may efficiently remove manganese from different water sources.

Published
2024
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27. Zinc-Silver Doped Mesoporous Hydroxyapatite Synthesized via Ultrasonic in Combination with Sol-Gel Method for Increased Antibacterial Activity

Author

Phatai, Piaw, primary, Prachumrak, Narid, additional, Kamonwannasit, Sirilak, additional, Kamcharoen, Agarat, additional, Roschat, Wuttichai, additional, Phewphong, Sunti, additional, Futalan, Cybelle Morales, additional, Khemthong, Pongtanawat, additional, Butburee, Teera, additional, Youngjan, Saran, additional, Millare, Jeremiah C., additional, and Prasitnok, Orrasa, additional

Published
2022
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31. Nanofiltration Membranes Formed through Interfacial Polymerization Involving Cycloalkane Amine Monomer and Trimesoyl Chloride Showing Some Tolerance to Chlorine during Dye Desalination

Author

Ang, Micah Belle Marie Yap, primary, Wu, Yi-Ling, additional, Chu, Min-Yi, additional, Wu, Ping-Han, additional, Chiao, Yu-Hsuan, additional, Millare, Jeremiah C., additional, Huang, Shu-Hsien, additional, Tsai, Hui-An, additional, and Lee, Kueir-Rarn, additional

Published
2022
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40. Modifying Cellulose Acetate Mixed-Matrix Membranes for Improved Oil–Water Separation: Comparison between Sodium and Organo-Montmorillonite as Particle Additives

Author

Ang, Micah Belle Marie Yap, primary, Devanadera, Kiara Pauline O., additional, Duena, Alyssa Nicole R., additional, Luo, Zheng-Yen, additional, Chiao, Yu-Hsuan, additional, Millare, Jeremiah C., additional, Aquino, Ruth R., additional, Huang, Shu-Hsien, additional, and Lee, Kueir-Rarn, additional

Published
2021
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