Seeded precipitation polymerization for the synthesis of gold-hydrogel core-shell particles: the role of surface functionalization and seed concentration

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• 作者：Astrid Rauh ; Tobias Honold ; Matthias Karg
• 关键词：Core ; shell colloids ; Hydrogel encapsulation ; Gold nanoparticles ; Seeded precipitation polymerization ; Localized surface plasmon resonance
• 刊名：Colloid & Polymer Science
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：294
• 期：1
• 页码：37-47
• 全文大小：1,211 KB
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• 作者单位：Astrid Rauh (1)
  Tobias Honold (1)
  Matthias Karg (1)
  
  1. Physical Chemistry I, University of Bayreuth, Universitaetsstr. 30, 95440, Bayreuth, Germany
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Polymer Sciences
  Physical Chemistry
  Soft Matter and Complex Fluids
  Characterization and Evaluation Materials
  Food Science
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1435-1536

文摘

Polymer encapsulation is an important pathway to stabilize inorganic nanoparticles, allow their phase transfer to different media, and access inter-particle distance control in particle assembly. In the past, hydrogels were shown to be a versatile encapsulation material offering rather thick polymeric shells through free radical precipitation polymerization. In this work, we systematically investigate the influence of nanoparticle surface functionalization and concentration on the formation of core-shell microgels. Spherical gold nanoparticles are used as seeds in the radical polymerization of N-isopropylacrylamide and N,N′-methylenebisacrylamide. We find that the encapsulation occurs via precipitation of oligomers/polymers onto the seed particle surface, independent of the presence of polymerizable groups. Furthermore, we identify the seed concentration regime where almost exclusively core-shell particles are formed. In this concentration range, the hydrogel thickness is precisely controllable by the amount of seeds. Monitoring the polymerizations in situ by dynamic light scattering and absorbance spectroscopy provides first insights into the encapsulation mechanism and its time dependence.