摘要:

The phase behavior of liquid crystalline in the ternary system of dodecyl dimethyl ammonium hydroxyl propyl sulfonate(DDAHPS)/1pentanol(C5HnOH) / water deuteron(D2O) has been investigated by polarizing optical microscopy,2H NMR spectroscopy methods. The results indicate that two kinds of liquid crystals (the lamellar, and the hexagonal) exist in the liquid crystalline phase region. In this paper, we also use the polarized Raman spectroscopy method to measure the values of the order/ disorder parameters and the values of the environment polarity parameters for the samples selected from the liquid crystalline phase region, and compare these two parameters of the samples with those of solid state DDAHPS and liquid state pentan-l-ol.

ISSN:0193-2691    

DOI:10.1080/01932699908943847

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

The phase composition and properties of microemulsion system of Titron N-101 / n-pentanol/ n-octane/ water (ammonia solution) were studied. CeO2nanopaticles were prepared by the reaction of cerous nitrate.

ISSN:0193-2691    

DOI:10.1080/01932699908943848

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

The polymerization of acrylamide in micellar solutions of cationic, anionic, zwitterionic and nonionic surfactants, initiated by NaHSO3, has been studied at 20 and 30° C with time variable method of thermokinetics for the 1. 5-order reaction in this paper. Reaction mechanism has been suggested and rate equations have been derived. The results indicate that ionic (CTAB, TTABDTAB, SDS) and zwitterionic (SLS) surfactants catalyze the polymerization in the order SDS>SLS>DTAB ≈ TTA≈ CTAB, and nonionic surfactant (Brij35) has slight inhibition effect. These effects are mainly caused by the effect of the formation of micelle- HSO3complex on the step of initiator to form free radical.

ISSN:0193-2691    

DOI:10.1080/01932699908943849

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

The polymerization of acrylamide in mixed micellar solutions of surfactants, initiated by NaHSO3has been studied at 20 and 3Q° C with time variable method of thermokinetics for 1. 5-order reaction. The results indicate that the mixed micellar systems of cationic or anionic with zwitterionic surfactants (SLS/ CTAB, SLS/ TTAB, SLS/ SDS) and cationic with nonionic surfactants (Brij 357sol; CTAB, Bri-J35/TTAB, Brij35/ DTAB) have catalytic effect on the polymerization in the order, at 20° C. SLS/ SDS⩽ SLS/ TTAB⩽ SLS/ CTAB⩽ Brij35/ CTAB at 30° C SLS/ SDS⩽ SLS/ TTAB≈ / CTAB⩽ Bri-j35/ DTAB= sBrij35/ TTAB as Brij35/ CTAB, while Brij35/ SDS mixed micellar system has inhibition. These effects are attributed to the effect of the Stern layer of mixed micelles on the step of initiator (HSOT) to form free radical.

ISSN:0193-2691    

DOI:10.1080/01932699908943850

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

ISSN:0193-2691    

DOI:10.1080/01932699908943851

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor