SAXS and DSC evaluation of interactions between H2O and Renex-100

Quimica nova

Kawachi, Elizabete Yoshie¹  Garcia, Renata Batista Rivero¹  Gonçalves, Rene Francisco Boschi¹  Queiroz, Hiure Anderson Alves da Silva¹  Cassu, Silvana Navarro²  Campos, Daniella Dias Palombino de³ 

[1] Instituto Tecnológico de Aeronáutica, São José dos Campos, Brasil;Instituto de Aeronáutica e Espaço, São José dos Campos, Brasil;Universidade Estadual de Campinas, Campinas, Brasil

关键词: interfacial water;    non-ionic surfactant;    mesophase.;   

DOI  :  10.1590/S0100-40422012000200023

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

The aggregationbehavior of the non-ionic surfactant Renex-100 in aqueous solutions and mesophaseswas evaluated by SAXS in a wide range of concentrations, between 20 and 30 °C.Complementary, water interactions were defined by DSC curves around 0°C.SAXS showed that the system undergoes the following phase transitions, fromdiluted to concentrated aqueous solutions: 1) isotropic solution of Renex aggregates;2) hexagonal mesophase; 3) lamellar mesophase; and 4) isotropic solution. DSCanalysis indicated the presence of interfacial water above 70wt%, which agreedwith the segregation of free water to form the structural mesophases observedby SAXS bellow this concentration.

【 授权许可】

CC BY