期刊
JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH
卷 4, 期 1, 页码 107-110出版社
SPRINGER
DOI: 10.1007/s11998-007-9002-7
关键词
nanoparticles; nanocomposite coatings; nanoparticle ordering; 1-d nanoparticle alignment; polyurethane coatings; nanoparticle processing
Atomic Force Microscopy and Scanning Electron Microscopy were used to study shear-induced alignment of alumina and silica nanoparticles in two-component polyurethane clear coatings. 1-D strings of nanoparticles, formed in an extended pearl-necklace fashion were observed near the surfaces of cured films at nanoparticle volume fractions less than 0.05. This alignment is affected by the shear conditions of the application method. When applied by spraying, linear particle strings as long, as 5 cm were observed in the direction of shear. Nanoparticle strings were also found. to a lesser extent, when coatings were applied by a drawdown method. The phenomenon was not observed in coatings applied with minimal shear. These particle string formations, in addition to affecting the performance of coatings, may have broader implications in the field of nanomaterials. Our literature searches so far have not uncovered reports of stable, I-D nanoparticle arrangements with same degree of linearity produced under simple shear with compositions having very low particle loadings.
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