Probing the effect of superplasticizer adsorption on the surface forces using the colloidal probe AFM technique

被引：103

作者：

Kauppi, A ^{[1
]}

Andersson, KA ^{[1
]}

Bergström, L ^{[1
]}

机构：

[1] Inst Surface Chem, YKI AB, SE-11486 Stockholm, Sweden

来源：

CEMENT AND CONCRETE RESEARCH | 2005年 / 35卷 / 01期

关键词：

dispersion; cement; MgO; superplasticizer; atomic force microscope (AFM);

D O I：

10.1016/j.cemconres.2004.07.008

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

The interactions between adsorbed superplasticizer layers have been studied using direct force measurements, with an atomic force microscope. MgO was used as a nonreactive model system for cement, and a novel freeze granulation method for the production of spherical particles suitable for the colloidal probe atomic force microscope (AFM)-technique is reported. We found that the interactions induced by the adsorption of the anionic acrylic ester-ethylene oxide (AAE-EO) copolymers can be described as electrosteric, with an electrostatic and steric contribution. The range of the steric repulsion varied between 1.5 and 5 nm and could be related to the length of the grafted ethylene oxide chains. The lignosulfonate also induced a significant steric contribution that could be related to a dense coil conformation of the adsorbed superplasticizer. (C) 2004 Elsevier Ltd. All rights reserved.

引用

页码：133 / 140

页数：8

共 22 条

[1] STERIC AND BRIDGING FORCES BETWEEN SURFACES FEARING ADSORBED POLYMER - AN ATOMIC-FORCE MICROSCOPY STUDY [J].