Structural characteristics of silica sonogels prepared with additions of isopropyl alcohol

Article Abstract:

A study obtained wet silica gels with ~1.4 x [10.sup.-3] mol SiO2/[cm.sup.3] and ~92 vol % liquid phase from sonohydrolysis of tetraethoxysilane (TEOS) with different additions of isopropyl alcohol (IPA). It was found that the fundamental role of isopropyl alcohol on the structure of the resulting aerogels is to decrease the porosity and the pore mean size as R changes from pure TEOS to R = 4.

All Other Basic Inorganic Chemical Manufacturing, Industrial inorganic chemicals, not elsewhere classified, Nitrogen Compounds, Silica Gel

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Interaction of ethylene oxide-propylene oxide copolymers with ionic surfactants studied by calorimetry: random versus block copolymers

Article Abstract:

Calorimetric methods are used for studying the interaction of random and block ethylene oxide (EO)-propylene oxide (PO) copolymers with ionic surfactants. The isothermal titration calorimetry (ITC) has shown that the interaction of surfactant with block copolymers is more intense than that with a random copolymer of similar composition.

Ethylene Oxide, Usage, Calorimetry, Block copolymers

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Isothermal calorimetric investigation of the interaction of poly(N-isopropylacrylamide) and ionic surfactants

Article Abstract:

The reciprocal action of poly(N-isopropylacrylamide) (PNIPAM) with anionic and cationic surfactants is studied using isothermal titration calorimetry. The results conclude that the interaction of PNIPAM with ionic surfactants is considerably influenced by temperature.

Surface active agents, Surface Active Agent Manufacturing, Anionic Surfactants, Analysis

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