木质素磺酸钠在水溶液中的聚集行为。

Aggregation behavior of sodium lignosulfonate in water solution.

机构信息

School of Chemistry and Chemical Engineering, Guangdong Provincial Laboratory of Green Chemical Technology, South China University of Technology, Guangzhou, Guangdong, 510640, China.

出版信息

J Phys Chem B. 2010 Dec 9;114(48):15857-61. doi: 10.1021/jp107036m. Epub 2010 Nov 15.

DOI:10.1021/jp107036m

PMID:21077665

Abstract

Lignosulfonate is a type of macromolecular surfactant widely used as interfacial additive in various industrial fields and it is produced during chemical pulping process. In this paper, we present a new effective method for measurement of the critical aggregation concentration (CAC) of sodium lignosulfonate (SL) in water solution, with which a value of 0.38 g L(-1) was obtained. Through the determination of CAC and observation by DLS, the state and dynamics of the formation of the SL micelles were disclosed. The results showed that SL was the state of individual molecules when its mass concentration was less than CAC; the individual SL molecules started to aggregate above CAC and thus micelles formed and grew with increasing SL concentration. The SL solution was quickly frozen and the structures of SL molecules or micelles were observed by ESEM, revealing that the spherical micelles were the main form of SL in the solution. Based on the results, the spherical hollow vesicular structure is proposed as a model of the aggregated micelles of SL in the solution.

摘要

木质素磺酸盐是一种高分子表面活性剂，广泛用作各种工业领域的界面添加剂，它是在化学制浆过程中产生的。在本文中，我们提出了一种测量木质素磺酸钠（SL）在水溶液中临界聚集浓度（CAC）的新有效方法，得到了 0.38 g/L 的值。通过 CAC 的测定和 DLS 的观察，揭示了 SL 胶束形成的状态和动力学。结果表明，当质量浓度小于 CAC 时，SL 处于单个分子的状态；当质量浓度大于 CAC 时，单个 SL 分子开始聚集，从而随着 SL 浓度的增加，胶束形成并生长。将 SL 溶液快速冷冻，通过 ESEM 观察 SL 分子或胶束的结构，表明球形胶束是 SL 在溶液中的主要形式。基于这些结果，提出了 SL 在溶液中聚集胶束的球形空心囊泡结构模型。