Hydrophobic Silane-Modified Surfaces

DNA immobilized by organosilane chemistries has proven to be an effective method for measuring impedance changes upon hybridization using both gold and platinum electrodes [21,50]. The effect of different silane chemistries creates differences in the hydrophobicity and hydration levels of the modified surface. The organosilane treatment along with the ssDNA... 

PFM experiments performed with surface-modified tips allow steady imaging of polymer blends with respect to the pull-off forces. Comparing non-modified, hydrophilic tips with modified hydrophobic tips reveals the inversion of the difference between the adhesive forces, indicating even an inversion of the strength of interactions between hydrophilic and hydrophobic polymer surfaces and the SFM tip or silica particles. It could also be shown that the hardness of the silane layer influences the measured pull-off forces. The harder HMDS modification leads to lower adhesive forces, like the softer PDMS modification, confirming the results obtained for toner-silica particles. 

A1(OH)3 HDPE PVC silicone OMCTS silane PDMS increased adhesion to matrix depends on concentration of modifier crosslinking decreases thermal stability, elongation and tensile str. surface hydrophobization resistance to solvent extraction and water 29 46 37... 

Most applications of liquid column chromatography are now made on silica which has been chemically modified (bonded phase chromatography). The modification is made by chemical reaction between the silanol groups and a chlorosilane compound. The carbon radicals of the chlorosilane compound determines the nature of the final column material. Using silanes containing alkyl carbon chains with 8-22 carbon atoms gives the particles hydrophobic surfaces, but more polar surfaces may be obtained by incorporation of alcohol, amino, cyano or other groups in the alkyl chain. 

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