Although octyl methoxy cinnamates (OMC) is the most used Ultraviolet B (UVB) filter in sunscreen, it has poor light stability in emulsion system. In this study, OMC/SiO₂ nanoparticles were prepared via sol-gel emulsion method. Tetraethoxy silane (TEOS) was used as the silica source to encapsulate OMC. Modification of experimental parameters such as stirring speed of condensation reaction and em...

This paper describes the preparation and characterization of an optical pH-sensing device using a H(+)-responsive fluoroionophore based on boron-dipyrromethene, immobilized to a mesoporous silica thin film. The fluoroionophore substituted with a silane coupling agent (KBH-01-Si) was successfully synthesized, and a mesoporous silica thin film was fabricated by the evaporation-induced-self-assemb...

The goal of this study was to define practical conditions and limitations of using silica-based, endcapped bonded-phase columns in intermediate and higher pH environments for developing rugged HPLC methods. Bonded-phase degradation in this pH range is a result mainly of silica support dissolution; covalently-bound silane ligands are hydrolyzed very slowly if at all from silica supports at inter...

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Introduction: The selection of porcelain is based on high biocompatibility, endurance, superficial texture and aesthetics. Nevertheless, the innate fracture charateritics of porcelain is the main cause of the intra oral fractures. Electing a suitable porcelain restorative system in terms of stability of color is important. For this reason, this study aimed to examine the color changes of common...

An amperometric sensor for hydrazine determination was developed using a surface modified copper (II) hexacyanoferrate (CuHCF) nanoparticles carbon ceramic composite electrode (CCE) by a versatile sol-gel technique using aminopropyl trimethoxy silane (APTMOS). The characterization of the modified electrode has been carried out by electrochemical techniques such as cyclic voltammetry, hydrodynam...

Electrospun cellulose acetate nanofibers (CA-NF) have been modified with perfluoro alkoxysilanes (FS/CA-NF) for tailoring their chemical and physical features aiming oil-water separation purposes. Strikingly, hybrid FS/CA-NF showed that perfluoro groups are rigidly positioned on the outer surface of the nanofibers providing superhydrophobic characteristic with a water contact angle of ∼155°. De...

The goal of this project was to develop a novel technology that may be used to eventually manufacture a new generation of inorganic membranes and sensors with oriented, uni-directional monosized pores. The premise is that very thin membranes with oriented channels as pores will have a high flux in addition to being highly selective. Applications include: 1) gas separation membranes for oxygen e...

Silica monolithic columns suitable for implementation on microchips have been evaluated by ion-exchange capillary electrochromatography. Two different silica monoliths were created from the alkyl silane, tetramethyl orthosilicate (TMOS), by introducing a water-soluble organic polymer, poly(ethylene oxide) (PEO), with varying molecular weights into the prehydrolyzed sol. Silica monoliths created...

The sol gel process is one of the processes used in manufacture thin films on membranes because it can control pore size resulting silica matrix. In addition, another way to build membrane be done by adding catalysts and precursors used. this study, using a combination tetraethyl ortho silicate (TEOS) triethoxy vinyl silane (TEVS) citric acid as catalyst produce matrix with mesoporous so that s...