Thermally triggered on demand permeability of hybrid silica beds made of packed thermoresponsive organo-silica microparticles

eXPRESS Polymer Letters

S. A. Jadhav¹ 

关键词: smart polymer;    silica microparticles;    polymer grafting;    hybrid thermoresponsive silica;    thermo-regulated permeability;   

DOI  :  10.3144/expresspolymlett.2019.8

学科分类：生物科学（综合）

来源: eXPRESS Polymer Letters

【 摘 要 】

This work reports the preparation and testing of porous beds made from packed vinylated silica microparticles(SiMPs) grafted with thermoresponsive poly(N-isopropylacrylamide) (PNIPAM) and exhibiting on demand thermally triggeredpermeability. PNIPAM-grafted hybrid SiMPs with diameters of 1.40–1.55 μm were synthesized and characterizedwith Attenuated Total Reflection Fourier Transform Infrared Spetroscopy (ATR-FTIR), Thermogravimetric Analysis (TGA),Flow Particle Image Analysis (FPIA) and Scannning Electron Miscroscopy (SEM) to elucidate their composition and morphology.The PNIPAM-grafted SiMPs were used to prepare thermoresponsive beds of dimensions 1×0.5×0.5 cm inside filtrationtubes. The thermo-regulated permeability of solutions of selected model compounds, namely caffeine, ketoprofen,orange II, bromocresol green and cresol red across the hybrid beds was tested by calculating the retention percentage of themodel compounds at temperatures below and above the lower critical solution temperature (LCST) of PNIPAM. The resultsshowed a clear control over the permeability of the packed hybrid beds mediated by external temperature changes. This controlwas achieved by virtue of the switchable nanovalves created by the thermoresponsive PNIPAM present in the inter-particlevoids of the packed beds.

【 授权许可】

CC BY