期刊论文详细信息
Journal of the Brazilian Chemical Society
PS-HEMA latex fractionation by sedimentation and colloidal crystallization
Cardoso, André H.1  Universidade Estadual de Campinas, Campinas, Brazil1  Galembeck, Fernando1  Leite, Carlos A.P.1 
关键词: latex fractionation;    colloidal crystallization;    latex sedimentation;    core-and-shell latex;    macrocrystal;    latex;   
DOI  :  10.1590/S0103-50531999000600013
学科分类:化学(综合)
来源: SciELO
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【 摘 要 】

Self-organized latex particle arrays1,2, either (dry) macrocrystals or (liquid) colloidal crystals, are often observed in latexes, and they have attracted the attention of many researchers. Many devices have been proposed to help building high quality macrocrystals, but the success rate is still low3-7 considering both the number of macrocrystalline domains obtained and the extent of correlated crystalline planes. On the other hand, many colloidal crystal-forming systems are known, and their equilibria with the colloidal "gas" phase8 have been studied but the formation of high quality colloidal crystals is still an exception rather than the rule. Practical applications of these structures call for a high degree of control over the processibility as well as the structure and composition of the latex9. Two conditions are usually fulfilled, in successful attempts of latex colloidal crystallization: the particle diameters are monodisperse and the ionic strength of the initial dispersion liquid is very low10-11. The importance of hydrophilic particle surfaces and capillary adhesion in the formation of dry macrocrystals is well acknowledged, following the work of Denkov, Nagayama et al.12, Distler and Koenig13, Whitesides and collab.3. In a paper on disorder-to-order in settling suspensions of colloidal silica, Davis et al.7 observed that ordered particle arrays were obtained at higher solid volume fractions (f > 0.5), but only when the rate of particle sedimentation is lower than the rate of particle crystallization.We have recently examined in detail the

【 授权许可】

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