Schmitt Julien, Hartwig Caroline, Crassous Jérôme J, Mihut Adriana M, Schurtenberger Peter, Alfredsson Viveka
Division of Physical Chemistry, Department of Chemistry, Lund University 221 00 Lund Sweden.
LSFC Laboratoire de Synthèse et Fonctionnalisation des Céramiques, UMR3080 CNRS/Saint-Gobain CREE, Saint-Gobain Research Provence 550 Avenue Alphonse Jauffret Cavaillon France
RSC Adv. 2020 Jul 3;10(42):25393-25401. doi: 10.1039/d0ra02278k. eCollection 2020 Jun 29.
Hybrid anisotropic microgels were synthesised using mesoporous silica as core particles. By finely controlling the synthesis conditions, the latter can be obtained with different shapes such as platelets, primary particles or rods. Using the core particles as seeds for precipitation polymerisation, a crosslinked poly(-isopropylacrylamide) (PNIPAM) microgel shell could be grown at the surface, conferring additional thermo-responsive properties. The different particles were characterised using scattering and imaging techniques. Small angle X-ray scattering (SAXS) was employed to identify the shape and porous organisation of the core particles and dynamic light scattering (DLS) to determine the swelling behaviour of the hybrid microgels. In addition, cryogenic transmission electron microscopy (cryo-TEM) imaging of the hybrids confirms the different morphologies as well as the presence of the microgel network and the core-shell conformation. Finally, the response of the particles to an alternating electric field is demonstrated for hybrid rod-shaped microgels using confocal laser scanning microscopy (CLSM).
使用介孔二氧化硅作为核心颗粒合成了杂化各向异性微凝胶。通过精细控制合成条件，可以获得具有不同形状的核心颗粒，如片状、初级颗粒或棒状。以核心颗粒为种子进行沉淀聚合，可以在其表面生长出交联的聚（N-异丙基丙烯酰胺）（PNIPAM）微凝胶壳，赋予其额外的热响应特性。使用散射和成像技术对不同的颗粒进行了表征。采用小角X射线散射（SAXS）来确定核心颗粒的形状和多孔结构，并用动态光散射（DLS）来测定杂化微凝胶的溶胀行为。此外，对杂化颗粒进行低温透射电子显微镜（cryo-TEM）成像，证实了其不同的形态以及微凝胶网络和核壳结构的存在。最后，使用共聚焦激光扫描显微镜（CLSM）展示了杂化棒状微凝胶颗粒对交变电场的响应。
