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Gelation of polymeric nanoparticles
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作者 Hua Wu Massimo Morbidelli 《中国颗粒学报:英文版》 SCIE EI CAS CSCD 2014年第3期1-11,共11页
We review how,starting from polymeric nanoparticles,to generate clusters of fractal morphology and to expand the entire space and interconnect to form gels,through either Brownian motion or intense shearinduced aggreg... We review how,starting from polymeric nanoparticles,to generate clusters of fractal morphology and to expand the entire space and interconnect to form gels,through either Brownian motion or intense shearinduced aggregation.In the case of Brownian motion-induced gelation,specific techniques developed to obtain uniform structure of gels under both reaction-limited and diffusion-limited cluster aggregation conditions have been described.In the case of intense shear-induced gelation as a newly developed technique,our focus is on its principle,theoretical development and advantages with respect to Brownian motion-induced gelation in practical applications.We consider gelation of both rigid and soft particles.As a physical process,the bonding between the particles within gels is owed to van der Waals attractions,thus being easily broken.However,in the case of soft particles that can coalesce upon contact,the coalescence can allow the particles to stick together forming permanent gels.In this case,the gel structure can be controlled by controlling the degree of coalescence.Techniques used to control the degree of coalescence have also been described. 展开更多
关键词 聚合物纳米粒子 纳米凝胶 技术开发 布朗运动 聚合条件 扩散限制 物理过程 凝胶化
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