Specific ionic effects on weak polyelectrolyte multilayer formation

Article Abstract:

An investigation was made of the effect of phosphates, chlorides and nitrates, and polyelectrolyte molecular weight, on formation and erosion of multilayers on silica surfaces. The results indicated that at very low ionic strength (1 mM), regular buildup of multilayers was observed, and at higher ionic strength, dissolution took place, and the critical 'glass-transition ionic strength' needed to dissolve the multilayer depended on the salt used and the polycation/polyanion pair studied.

Industrial sand, Silica & Silica Sand, Industrial Sand Mining, Silica, Ions, Chemical properties, Silicon dioxide

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Interpolyelectrolyte reactions in solutions of polycarboxybetaines, 2: Influence of alkyl spacer in the betaine moieties on complexing with polyanions

Article Abstract:

The complex formation between polycarboxybetaines (PCB) and polyanions can be enhanced and efficiently controlled by the proper choice of alkyl spacer between charges in the betaine moieties. Practical ramifications of the revealed role of the alkyl spacer in polyelectrolyte complexation as well as the pH-induced stabilization of the complexes that occurs under enzyme-friendly conditions might extend to areas of biotechnology, specifically in bioseperation and gene delivery.

Electric properties, Alkyl groups, Betaine

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Interpolyelectrolyte reactions in solutions of Polycarboxybetaines

Article Abstract:

Potentiometry, turbidimetry, and fluorescence spectroscopy were used to reveal the utility of different polycarboxybetaines (PCB) as positively charged components of polyelectrolyte complexes. The results indicated that PCB interacts efficiently with sodium poly(styrenesulfonate) forming polyelectrolyte complex with pH-controlled solubility, and this could be important in the development of bioseparation techniques.

Usage, Chemical reactions, Fluorescence spectroscopy, Potentiometry

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