Surface interaction forces mediated by poly(N-isopropylacrylamide) (PNIPAM) polymers: effects of concentration and temperature
Publication in refereed journal


摘要Total internal reflection microscopy was used to directly measure the interaction potentials between a micron-sized silica sphere and a flat silica surface in the presence of a linear poly(N-isopropylacrylamide) (PNIPAM) aqueous solution. When the PNIPAM concentration was low, no discernible forces were detected. A further increase in PNIPAM concentration resulted in a long-range attraction which was likely due to a combined of the reduced electrostatic interaction between the silica particle and the flat surface after the polymer adsorption and polymer bridges formation. On the other hand, for a fixed PNIPAM concentration, the interaction potential profiles between the particle and flat surface were once again characterized by attraction as temperature was increased. This attractive force can be explained in terms of the conformational changes of PNIPAM chains at the surfaces, which subsequently affected the polymer adsorption and enhanced the segment-segment interaction among the adsorbed polymer chains.
著者Gong XJ, Wu C, Ngai T
期刊名稱Colloid and Polymer Science
出版社Springer Verlag (Germany)
頁次1167 - 1172
關鍵詞Attractive force, Colloidal interaction, Colloids, PNIPAM, Surface force, Total internal reflection microscopy (TIRM)
Web of Science 學科類別Chemistry; Chemistry, Physical; CHEMISTRY, PHYSICAL; Polymer Science; POLYMER SCIENCE

上次更新時間 2021-20-01 於 00:54