Equation of state and adsorption dynamics of soft microgel particles at an air-water interface

被引：62
作者：
Deshmukh, Omkar S. [1 ]
Maestro, Armando [1 ]
Duits, Michel H. G. [1 ]
van den Ende, Dirk [1 ]
Stuart, Martien Cohen [1 ]
Mugele, Frieder [1 ]
机构：
[1] Univ Twente, Dept Sci & Technol, NL-7500 AE Enschede, Netherlands
来源：
SOFT MATTER | 2014年 / 10卷 / 36期
关键词：
CROSS-LINK DENSITY; POLY(N-ISOPROPYLACRYLAMIDE) MICROGELS; EMULSION STABILIZERS; SENSITIVE MICROGELS; TEMPERATURE; SURFACTANTS; SCATTERING; KINETICS; LIGHT; FLUID;
D O I：
10.1039/c4sm00566j
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Understanding the adsorption dynamics of soft microgel particles is a key step in designing such particles for potential applications as stimuli-responsive Pickering stabilizers for foams or emulsions. In this study we experimentally determine an equation of state (EOS) for poly (N-isopropylacrylamide) (PNIPAM) microgel particles adsorbed onto an air-water interface using a Langmuir film balance. We detect a finite surface pressure at very low surface concentration of particles, for which standard theories based on hard disk models predict negligible pressures, implying that the particles must deform strongly upon adsorption to the interface. Furthermore, we study the evolution of the surface pressure due to the adsorption of PNIPAM particles as a function of time using pendant drop tensiometry. The equation of state determined in the equilibrium measurements allows us to extract the adsorbed amount as a function of time. We find a mixed-kinetic adsorption that is initially controlled by the diffusion of particles towards the interface. At later stages, a slow exponential relaxation indicates the presence of a coverage-dependent adsorption barrier related to crowding of particles at the interface.
引用
收藏
页码：7045 / 7050
页数：6
相关论文
共 34 条
[1]   Preparation of Monodisperse Poly(N-isopropylacrylamide) Microgel Particles with Homogenous Cross-Link Density Distribution [J].
Acciaro, Roberta ;
Gilanyi, Tibor ;
Varga, Imre .
LANGMUIR, 2011, 27 (12) :7917-7925
[2]   Particles as surfactants - similarities and differences [J].
Binks, BP .
CURRENT OPINION IN COLLOID & INTERFACE SCIENCE, 2002, 7 (1-2) :21-41
[3]   Microgels as Stimuli-Responsive Stabilizers for Emulsions [J].
Brugger, Bastian ;
Rosen, Brian A. ;
Richtering, Walter .
LANGMUIR, 2008, 24 (21) :12202-12208
[4]   Emulsions stabilized by stimuli-sensitive poly(N-isopropylacrylamide)-co-methacrylic acid polymers:: Microgels versus low molecular weight polymers [J].
Brugger, Bastian ;
Richtering, Walter .
LANGMUIR, 2008, 24 (15) :7769-7777
[5]   Interfacial layers of stimuli-responsive poly-(N-isopropylacrylamide-co-methacrylicacid) (PNIPAM-co-MAA) microgels characterized by interfacial rheology and compression isotherms [J].
Brugger, Bastian ;
Vermant, Jan ;
Richtering, Walter .
PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 2010, 12 (43) :14573-14578
[6]   The Effect of Co-Monomer Content on the Swelling/Shrinking and Mechanical Behaviour of Individually Adsorbed PNIPAM Microgel Particles [J].
Burmistrova, Anna ;
Richter, Marcel ;
Eisele, Michael ;
Uezuem, Cagri ;
von Klitzing, Regine .
POLYMERS, 2011, 3 (04) :1575-1590
[7]   ADSORPTION DYNAMICS OF SURFACTANTS AT THE AIR/WATER INTERFACE - A CRITICAL-REVIEW OF MATHEMATICAL-MODELS, DATA, AND MECHANISMS [J].
CHANG, CH ;
FRANSES, EI .
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, 1995, 100 :1-45
[8]   Tracking the interfacial dynamics of PNiPAM soft microgels particles adsorbed at the air-water interface and in thin liquid films [J].
Cohin, Yann ;
Fisson, Maelle ;
Jourde, Kevin ;
Fuller, Gerald G. ;
Sanson, Nicolas ;
Talini, Laurence ;
Monteux, Cecile .
RHEOLOGICA ACTA, 2013, 52 (05) :445-454
[9]   Influence of Cationic Composition and pH on the Formation of Metal Stearates at Oil-Water Interfaces [J].
de Ruiter, Rielle ;
Tjerkstra, R. Willem ;
Duits, Michel H. G. ;
Mugele, Frieder .
LANGMUIR, 2011, 27 (14) :8738-8747
[10]  
Deshmukh O. S., UNPUB
1234