Temperature controlled surface hydrophobicity and interaction forces induced by poly (N-isopropylacrylamide)

Journal of Colloid and Interface Science
Elizaveta BurdukovaGeorge V Franks

Abstract

Poly (N-isopropylacrylamide) (PNIPAM) is a temperature responsive polymer. At temperature below its lower critical solution temperature (LCST 32 degrees C) PNIPAM is soluble in water and hydrophilic. At temperature above the LCST, the polymer becomes hydrophobic and insoluble in water. At temperatures above the LCST, PNIPAM has been shown to induce flotation of previously hydrophilic minerals. The mechanism is believed to be an increase in particle hydrophobicity when PNIPAM adsorbs to the particle surfaces at high temperature. This paper investigates the interaction forces between bare silica surfaces in PNIPAM solutions. The influence of three phase contact angles on these interactions, in the presence of polymers of different molecular weights, is also examined. It was found that the presence of PNIPAM on silica surfaces significantly increases their hydrophobicity at a temperature above the LCST. The AFM measurements of surface forces at high temperature also showed that strong adhesion is present between the PNIPAM coated surfaces, which is absent in the absence of polymer. These findings lead to the conclusion that the detected attractive force and subsequent adhesion result from hydrophobic attraction induced by PNIPAM a...Continue Reading

References

Jun 30, 2000·Journal of Colloid and Interface Science·J LiuA N Hrymak
Sep 29, 2004·Journal of Colloid and Interface Science·Shuji Sakohara, Kazuo Nishikawa
Dec 14, 2005·Journal of Colloid and Interface Science·Naoyuki Ishida, Mikio Kobayashi
Oct 2, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·Naoyuki Ishida, Simon Biggs
Mar 28, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Xue Hua ZhangWilliam A Ducker
Aug 30, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Ying ZhouGeorge V Franks

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Citations

Sep 22, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·Iliana G SedevaDavid A Beattie
Oct 22, 2014·Physical Chemistry Chemical Physics : PCCP·David A BeattieKai-Ying Yeap
Feb 19, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Yinan WangRavin Narain
Nov 3, 2010·Journal of Colloid and Interface Science·Elizaveta BurdukovaGeorge V Franks
May 14, 2011·Journal of Colloid and Interface Science·John-Paul O'SheaGeorge V Franks
Nov 11, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·John-Paul O'SheaGeorge V Franks
Aug 2, 2017·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Shulei LiYijun Cao
Jul 12, 2020·Materials·Heekyung ParkDonghyun Lee
Jun 7, 2018·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Jian-Wei GuoJem-Kun Chen
Mar 11, 2020·Frontiers in Nutrition·Vincent BodiouMark J Post
Mar 3, 2020·Nanoscale Horizons : the Home for Rapid Reports of Exceptional Significance in Nanoscience and Nanotechnolgy·Hui GaoSijie Chen
Feb 6, 2017·Journal of Colloid and Interface Science·Wei Sung NgGeorge V Franks
Oct 22, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·David van DuinenRüdiger Berger

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