Aqueous latex/ceramic nanoparticle dispersions: colloidal stability and coating properties

被引:96
作者
Sun, JK
Velamakanni, BV
Gerberich, WW
Francis, LF
机构
[1] Univ Minnesota, Dept Chem Engn & Mat Sci, Minneapolis, MN 55455 USA
[2] 3M Co, 3M ESP Dent Prod, St Paul, MN 55144 USA
关键词
latices; transparent conductive coatings; antimony-doped tin oxide; indium tin oxide; percolation; microstructure; colloidal stability; DLVO theory;
D O I
10.1016/j.jcis.2004.08.014
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The effect of pH on the colloidal stability of aqueous dispersions containing antimony-doped tin oxide (ATO) Or indium tin oxide (ITO) nanoparticles and poly(vinyl acetate-acrylic) copolymer (PVAc-co-acrylic) latex particles was investigated using experimental observations and Derjiaguin, Landau. Verwey and Overbeek (DLVO) theory. The microstructure, electrical properties and optical properties of composite coatings prepared from various dispersions were also studied. Zeta potential measurements revealed that the isoelectric point (IEP) of ATO nanoparticles was below pH 2.0, that of ITO nanoparticles was at pH similar to 6.0 and that of PVAc-co-acrylic latex was at pH - 2.0. ATO/PVAc-co-acrylic dispersions prepared at pH 3 were stable, but those prepared at pH 1.5 formed aggregates, which settled quickly with time. DLVO theory predictions are in accord with these results. Stable ITO/PVAc-co-acrylic dispersions are obtained at a pH of 3.0 and 11.0 but dispersions are not stable at a pH of 6.0. the IEP of ITO. At a pH of 3.0, DLVO results predict attraction between ITO particles and latex particles. Dispersion pH affected the microstructures laid properties of ATO (or ITO)/PVAc-co-acrylic coatings. Suspensions that formed aggregates produced coatings with lower percolation thresholds,aid lower transparencies than those produced from stable suspensions. (C) 2004 Elsevier Inc. All rights reserved.
引用
收藏
页码:387 / 399
页数:13
相关论文
共 78 条
[1]   Comparisons of Hamaker constants for ceramic systems with intervening vacuum or water: From force laws and physical properties [J].
Ackler, HD ;
French, RH ;
Chiang, YM .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1996, 179 (02) :460-469
[2]   STUDIES OF DOUBLE LAYER ON CASSITERITE AND RUTILE [J].
AHMED, SM ;
MAKSIMOV, D .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1969, 29 (01) :97-&
[3]   Evolution of surface structure and chemistry of pigmented coatings during drying [J].
Al-Turaif, H ;
Lepoutre, P .
PROGRESS IN ORGANIC COATINGS, 2000, 38 (01) :43-52
[4]  
[Anonymous], APPL SURF SCI
[5]   THE INFLUENCE OF POINT-DEFECTS ON THE FLOATABILITY OF CASSITERITE .1. PROPERTIES OF SYNTHETIC AND NATURAL CASSITERITES [J].
BALACHANDRAN, SB ;
SIMKOVICH, G ;
APLAN, FF .
INTERNATIONAL JOURNAL OF MINERAL PROCESSING, 1987, 21 (3-4) :157-171
[6]  
Baumstark R, 2002, MACROMOL SYMP, V187, P177, DOI 10.1002/1521-3900(200209)187:1<177::AID-MASY177>3.0.CO
[7]  
2-1
[8]   APPROXIMATE METHODS OF DETERMINING DOUBLE-LAYER FREE ENERGY OF INTERACTION BETWEEN 2 CHARGED COLLOIDAL SPHERES [J].
BELL, GM ;
LEVINE, S ;
MCCARTNE.LN .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1970, 33 (03) :335-&
[9]   Hamaker constants of inorganic materials [J].
Bergstrom, L .
ADVANCES IN COLLOID AND INTERFACE SCIENCE, 1997, 70 :125-169
[10]  
Bohren C., 1983, ABSORPTION SCATTERIN