共 40 条
Silica nanoparticle crystals and ordered coatings using lys-sil and a novel coating device
被引:71
作者:
Snyder, Mark A.
[1
]
Lee, J. Alex
[1
]
Davis, Tracy M.
[1
]
Scriven, L. E.
[1
]
Tsapatsis, Michael
[1
]
机构:
[1] Univ Minnesota, Dept Chem Engn & Mat Sci, Minneapolis, MN 55455 USA
来源:
关键词:
D O I:
10.1021/la701063v
中图分类号:
O6 [化学];
学科分类号:
0703 ;
摘要:
Silica nanoparticles with a narrow particle size distribution and controlled diameters of 10-20 nm are synthesized via hydrolysis and hydrothermal aging of tetraethylorthosilicate in an aqueous L-lysine solution. Cryo-transmission electron microscopy (cryo-TEM) reveals that the silica nanoparticles assemble to form close-packed nanoparticle crystals over short length scales on carbon-coated grids. Evaporative drying of the same sols results in nanoparticle stability and remarkable long-range facile ordering of the silica nanoparticles over scales greater than 10 mu m. Whereas small-angle X-ray scattering (SAXS) and small-angle neutron scattering (SANS) discount the possibility of a core (silica)-shell (lysine) structure, the possibility remains for lysine occlusion within the silica nanoparticles and concomitant hydrogen bonding effects driving self-assembly. Facile ordering of the silica nanoparticles into multilayer and monolayer coatings over square-centimeter areas by evaporation-induced self-assembly is demonstrated using a novel dip-coating device.
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页码:9924 / 9928
页数:5
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