Silica or glass particles are introduced in a poly(dimethylsiloxane) (PDMS) matrix for various applications. A particular feature of these systems is that PDMS adsorbs on the surface of the dispersed particles, thus rendering them more hydrophobic with time. The mechanism of this process of in situ hydrophobization is still poorly understood. The major aims of the present study are (1) to quant...

In this research, different alcohols and phenols are subjected to the reaction with HMDS in the presence of ionic liquid and silica-supported catalysts. Silylation was accomplished under mild reaction conditions at room temperature in short reaction times and good to excellent yields.

The present article reports the application of hexamethylsilazane (HMDS) modified filter paper for ultrasensitive detection of Hg(2+), Co(2+) and Zn(2+). By chemical vapor deposition of HMDS, a highly hydrophilic filter paper was fabricated to a low wetting (hydrophobic) substrate. The water contact angle (θ) of modified paper was ∼128°, whereas scanning electron and atomic force microscopy con...

We report measurements of the state of wetting of two liquid mixtures at coexistence near their respective critical consolute temperatures. Borosilicate glass capillary tubes were reacted with hexamethyldisilazane to produce substrates of uniform and controlled silylation. Surfaces of low coverage exhibit a series of first-order partial to complete wetting transitions and obey a short-range for...

In this research, different alcohols and phenols are subjected to the reaction with HMDS in the presence of ionic liquid and silica-supported catalysts. Silylation was accomplished under mild reaction conditions at room temperature in short reaction times and good to excellent yields.

Gastropod haemocyanins are multisubunit copper-containing proteins with molecular weights in the region of 9 x lo6. They have been shown to be glycoproteins with total carbohydrate contents of 1-8 %, estimated by colorimetric and quantitative t.1.c. methods (Dijk et al., 1970). They are unusual in having no sialic acid residues, but, as is the case with most other glycoproteins, there are few c...

We have recently demonstrated the viability of silicon microarray pins, taking advantage of lithographic and batch processing of silicon micromachining in comparison with conventional and serial processing currently used for commercial pins. The reduced spot size (< 50% in diameter, i.e., > 4X in array density), however, made such undesirable needs as preprinting more pronounced. Preprinting, a...

In this work, we study the use of supercritical fluid technology based on carbon dioxide to fractionate a complex carbohydrate mixture, which is a dairy-based prebiotic ingredient containing galacto-oligosaccharides (GOS) along with monosaccharides and disaccharides. The beneficial health effects of this commercial mixture, such as the improvement of the immune system, have been associated to i...

Membranes exhibiting high flux and selectivity are important for many applications, including water desalination, greenhouse gas storage and abatement, H2 purification, and selective proton/oxygen conduction in fuel cells. Combined high flux and selectivity is achieved in natural systems by membrane-bound ion and molecular channelsswhose pore size is defined with sub-nanometer precision through...