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首页> 外文期刊>Chemistry: A European journal >Surface-functionalized latex particles as controlling agents for the mineralization of zinc oxide in aqueous medium
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Surface-functionalized latex particles as controlling agents for the mineralization of zinc oxide in aqueous medium

机译：表面官能化的乳胶颗粒作为控制剂，用于在水性介质中矿化氧化锌

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Polystyrene latex particles modified at the surface with different hydrophilic functional groups were prepared by miniemulsion polymerization and used as controlling agents in the crystallization of zinc oxide from aqueous medium. The effects of the chemical nature of the surface functionalization and the latex concentration on the crystal growth, morphology, and crystalline structure of the resulting zinc oxide were analyzed. Micro- and submicrosized crystals with a broad variety of morphologies depending on the functionalization were obtained. Among the different latexes studied, the acrylic-acid-derived particles were shown to be a convenient system for further quantitative investigations. In this case, as the additive concentration increases, the length-to-width ratio (aspect ratio) of the crystals decreases systematically. Preferential adsorption of the latex particles onto the fastgrowing faces {001} of ZnO is assumed to follow a Langmuir-type isotherm, and interaction of the adsorbed particles with the growth centers will reduce the growth rate in [001]. This leads to a quantitative relationship linking the aspect ratio to the latex concentration at constant diameter and surface chemistry of the latex. The dependence of the aspect ratio on charge density of the latex can also be modeled by an algorithm in which attractive forces between the latex particle and the ZnO surface are balanced against repulsive forces of an osmotic nature. The latter are associated with the confined volume between the crystal and latex particle surfaces.
机译：通过细乳液聚合制备在表面改性了具有不同亲水官能团的聚苯乙烯胶乳颗粒，并将其用作控制剂，以从水性介质中结晶氧化锌。分析了表面官能化的化学性质和胶乳浓度对所得氧化锌晶体生长，形态和晶体结构的影响。根据功能的不同，获得了具有多种形貌的微晶和亚微晶。在研究的不同胶乳中，丙烯酸衍生的颗粒被证明是用于进一步定量研究的便利系统。在这种情况下，随着添加剂浓度的增加，晶体的长宽比（纵横比）系统地减小。假定胶乳颗粒在ZnO的快速生长表面{001}上的优先吸附遵循Langmuir型等温线，并且吸附颗粒与生长中心的相互作用将降低[001]中的生长速率。这导致定量关系，将纵横比与恒定直径的胶乳浓度和胶乳的表面化学性质联系起来。纵横比对胶乳电荷密度的依赖性也可以通过一种算法来建模，在该算法中，胶乳颗粒和ZnO表面之间的吸引力与渗透性的排斥力相平衡。后者与晶体和乳胶颗粒表面之间的有限体积有关。

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