Hernando S. Salapare

Centre National de la Recherche Scientifique

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Frédéric Guittard

Université Côte d'Azur

Henry J. Ramos

University of the Philippines Diliman

Sonia Amigoni

Nature Inspires Creativity Engineers Lab

Thierry Darmanin

Université Côte d'Azur

Hannah Shamina O. Cosiñero

University of the Philippines Diliman

Julius Andrew P. Nuñez

University of the Philippines Manila

Miguel Bacaoco

University of Technology Sydney

Gene Q. Blantocas

Qassim University

Beverly Anne T. Suarez

Doshisha University

Juvy A. Balbarona

University of the Philippines Diliman

Cooperative Institutions

University of the Philippines Diliman

Centre National de la Recherche Scientifique

University of the Philippines System

Université Côte d'Azur

Institut de Chimie de Nice

Laboratoire de physique de la matière condensée

Observatoire de la Côte d’Azur

University of Rostock

Institut de Biologie Valrose

Czech Academy of Sciences, Institute of Physics

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Photodegradation of Rhodamine 6G by Amorphous TiO2 Films Grown on Polymethylmethacrylate by Magnetron Sputtering

Protection of Metals and Physical Chemistry of Surfaces (2017)

Julius Andrew P. Nuñez Hernando S. Salapare Michelle Marie S. Villamayor L. De Los Santos Valladares Henry J. Ramos

Photodegradation

Rhodamine 6G

Titanium Dioxide

10.1134/s207020511706017x

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Citations (4)

Bioinspired and biobased chemistry & materials (N.I.C.E. 2020): onsite and online hybrid conference

Pure and Applied Chemistry (2021)

Hernando S. Salapare Sonia Amigoni Frédéric Guittard

Article Bioinspired and biobased chemistry & materials (N.I.C.E. 2020): onsite and online hybrid conference was published on November 1, 2021 in the journal Pure and Applied Chemistry (volume 93, issue 11).

10.1515/pac-2021-1011

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Development of Drop Size Distribution Model for Dropwise Condensation on a Superhydrophobic Surface

Colloids and Interfaces (2023)

Gerald Jo Denoga Juvy A. Balbarona Hernando S. Salapare

This study presents a mathematical model of drop size distribution during dropwise condensation on a superhydrophobic surface. The model is developed by combining a power law growth model, an exponentially decaying population model, and a Gaussian probability model for growth variations. The model is validated against experiment data, with correlations ranging from 88% to 94%. The growth model is shown to sufficiently describe the growth of drops from 0.02 mm to 0.1 mm but may be extrapolated to describe the growth of even smaller drops. The experiment data show that drop size distribution or frequency distribution of drops of different sizes varies significantly with time and may be considered pseudo-cyclic. The developed model, together with the sweep rate of drops, sufficiently describes this behavior and, consequently, may also be used to better estimate the heat transfer rate due to dropwise condensation.

10.3390/colloids7030053

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Citations (2)

Adsorption of diclofenac sodium in aqueous solution using plasma-activated natural zeolites

Results in Physics (2019)

John Jomari M. Garcia Julius Andrew P. Nuñez Hernando S. Salapare Magdaleno R. Vasquez

Plasma-activated zeolites were used in the removal of diclofenac sodium (DCF) via adsorption in an aqueous solution. The natural zeolites were exposed to 13.56 MHz radio frequency-driven plasma discharge using argon as the working gas. Results have shown an increase in adsorption capacity of DCF to 64% from 52% using the plasma-treated and untreated zeolites, respectively. Further analysis showed no significant changes in the bulk properties of the zeolite after plasma exposure. However, an apparent increase in surface porosity was observed after treatment due to etching and ablation effects of the impinging energetic particles from the discharge. The adsorption of DCF followed the Freundlich isotherm model suggesting that the modified surface is heterogeneous allowing multilayer adsorption. This work realized the enhancement of adsorption capacity of natural zeolites via plasma treatment. The plasma-treated zeolites are inexpensive candidates for the removal of emerging pharmaceutical wastes in wastewater such as DCF.

Diclofenac Sodium

10.1016/j.rinp.2019.102629

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Citations (31)

The Porosity And Wettability Properties Of Hydrogen Ion Treated Poly(Tetrafluoroethylene)

Brill Academic Publishers eBooks (2010)

Hernando S. Salapare Gene Q. Blantocas Virginia R. Noguera H. J. Ramos

The porosity and wettability properties of hydrogen ion treated polytetrafluoroethylene (PTFE) materials are related using contact angle, scanning electron microscopy (SEM), and ellipsometry tests.PTFE are irradiated using a low energy hydrogen ion shower (LEHIS) produced by a Gas Discharge Ion Source (GDIS).The plasma discharge current (I d ) is varied at intervals of 1 mA.Results show that treatment using lower I d enhances the hydrophobic property of the PTFE material with contact angle value of as high as 118.6.It also becomes less porous as indicated by the increase in the index of refraction, decrease in optical transmittance, and increased scissions and striations in the SEM images.Opposite effects are observed for higher I d .

10.1163/ej.9789004169326.i-400.89

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Effect of Acid Blue dyes on the electrochemical capacitance of polypyrrole

Materials Research Bulletin (2023)

Doebner Von Tumacder Zuzana Morávková Magdalena Konefał Hernando S. Salapare Frédéric Guittard

Polypyrrole

Electrosynthesis

Pyrrole

Morphology

10.1016/j.materresbull.2023.112455

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Cupric Oxide Nanostructures from Plasma Surface Modification of Copper

Biomimetics (2019)

Hernando S. Salapare Juvy A. Balbarona Léo Clerc Pierre Bassoleil Arnaud Zenerino

Taking inspiration from the hydrophilic and superhydrophilic properties observed from the nanostructures present on the leaves of plants such as Alocasia odora, Calathea zebrina, and Ruelia devosiana, we were able to synthesize cupric oxide (CuO) nanostructures from the plasma surface modification of copper (Cu) that exhibits hydrophilic and superhydrophilic properties. The Cu sheets were exposed to oxygen plasma produced from the P300 plasma device (Alliance Concept, Cran-Gevrier, France) at varying power, irradiation times, gas flow rates, and pulsing duty cycles. The untreated and plasma-treated Cu sheets were characterized by contact angle measurements, scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS) to determine the changes in the surface of Cu before and after plasma treatment. Results showed that plasma-treated Cu sheets exhibited enhanced wetting properties compared to untreated Cu. We attributed the decrease in the measured water contact angles after plasma treatment to increased surface roughness, formation of CuO nanostructures, and transformation of Cu to either CuO2 or Cu2O3. The presence of the CuO nanostructures on the surface of Cu is very useful in terms of its possible applications, such as: (1) in antimicrobial and anti-fouling tubing; (2) in the improvement of heat dissipation devices, such as microfluidic cooling systems and heat pipes; and (3) as an additional protection to Cu from further corrosion. This study also shows the possible mechanisms on how CuO, CuO2, and Cu2O3 were formed from Cu based on the varying the plasma parameters.

Surface Modification

Copper oxide

Superhydrophilicity

Energy-dispersive X-ray spectroscopy

10.3390/biomimetics4020042

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Citations (13)

Fourier transform infrared spectroscopy (FTIR) characterization and contact angle measurement of low energy hydrogen ion shower (LEHIS) treated polyethylene terephthalate (PET) materials

Proceedings of the Samahang Pisika ng Pilipinas (2013)

Hannah Shamina O. Cosiñero Janella Mae Salamani Hernando S. Salapare Henry J. Ramos

The chemical and physical changes after treatment of polyethylene tereph-thalate (PET) samples from low energy hydrogen ion shower (LEHIS) produced from the gas discharge ion source (GDIS) were investigated using contact angle measurements and Fourier transform infrared spectroscopy (FTIR). Discharge current and treatment times were varied to see their effects on the PET samples. All LEHIS-treated samples achieved higher contact angles relative to the untreated PET. The FTIR spectra of the samples indicated that there are no significant chemical changes that occurred in the plasma treatment of the samples. Physical changes may be attributed through further characterization techniques like the SEM, AFM, and other physical characterizations.

Characterization

Source

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RF Plasma Treatment of Neptune Grass (Posidonia oceanica): A Facile Method to Achieve Superhydrophilic Surfaces for Dye Adsorption from Aqueous Solutions

Hernando S. Salapare Ma. Gregoria Joanne P. Tiquio Henry J. Ramos

This chapter contains sections titled: Introduction Experimental Details Results and Discussion Conclusions

Posidonia oceanica

Neptune

Superhydrophilicity

10.1002/9781119117018.ch12

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