Control of nanoparticle organization in two dimensions by adsorbed polymer layers

机译：通过吸附的聚合物层二维控制纳米粒子的组织

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When a dilute dispersion of relatively monodisperse silica particles is dried on a solid substrate, close-packed arrays are formed. The ordering of the particles results from attractive capillary forces between neighboring particles, and convec-tive transport of particles to the ordered domain during drying. In the presence of adsorbed polymer layers on the particles, the close-packed arrays are disrupted and the particles are disperse upon drying. This is due to steric repulsions of adsorbed polymer layers that prevent close contact of particles during drying, decreasing the probability for formation of the nucleus phase for close-packed ordering. Using electron spectroscopy imaging in a transmission electron microscope, we directly observed the adsorbed polymer layers on the dry dispersion. The thickness of the adsorbed layer and its effect on particle dispersion are investigated as a function of polymer concentration, chain length and solvent quality.

机译：当将相对单分散的二氧化硅颗粒的稀分散体在固体基质上干燥时，形成密排阵列。颗粒的排序是由于相邻颗粒之间的吸引力毛细作用力以及干燥过程中颗粒对流传输到有序区域的结果。在颗粒上存在吸附的聚合物层的情况下，密排的阵列被破坏并且颗粒在干燥时分散。这是由于吸附的聚合物层的空间排斥作用，该空间排斥作用阻止了干燥过程中颗粒的紧密接触，从而降低了以紧密堆积的顺序形成核相的可能性。使用透射电子显微镜中的电子光谱成像，我们直接观察到干燥分散体上吸附的聚合物层。研究了吸附层的厚度及其对颗粒分散性的影响，它是聚合物浓度，链长和溶剂质量的函数。

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《International Conference on Surface and Colloid Science; 200309; Brazil》|2003年|P.74-80|共7页
会议地点 Brazil
作者
Carlos A.R. Costa; Carlos A.P. Leite; Lay-Theng Lee; Fernando Galembeck;
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作者单位

Instituto de Quimica, Instituto do Milenio de Materiais Complexos, Universidade Estadual de Campinas, CP 6154, 13083-970 Campinas, SP, Brazil;

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会议组织
原文格式 PDF
正文语种 eng
中图分类工程材料一般性问题;
关键词
stoeber silica; poly(N-isopropylacrylamide); adsorbed polymer layers; electron spectroscopy imaging in a transmission electron microscope;

机译：stoeber二氧化硅；聚（N-异丙基丙烯酰胺）；吸附的聚合物层；透射电子显微镜中的电子光谱成像;

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4. Control of nanoparticle organization in two dimensions by adsorbed polymer layers [C] . C. A. R. Costa, C. A. P. Leite, L.-T. Lee, International Conference on Surface and Colloid Science . 2004

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Control of nanoparticle organization in two dimensions by adsorbed polymer layers

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