Interface-induced hysteretic volume phase transition of microgels: simulation and experiment
نویسندگان
چکیده
Thermo-responsive microgel particles can exhibit a drastic volume shrinkage upon increasing the solvent temperature. Recently we found that spreading of poly(N-isopropylacrylamide)(PNiPAm) microgels at liquid interface under influence surface tension hinders temperature-induced phase transition. In addition, observed hysteresis behavior temperature cycling, i.e. different evolution in size and shape depending on whether was initially adsorbed to expanded or collapsed state. Here, model transition such an air/water by monomer-resolved Brownian dynamics simulations compare with experiments. We reproduce experimentally dimensions variation. Our did not observe any for dispersed bulk liquid, suggesting it results from distinct interfacial morphology interface. An brought subjected subsequent swelling collapsing (resp. cooling heating) will end up larger than had original Further however, only shows much reduced hysteresis, agreement our experimental observations. attribute hysteretic kinetically trapped initial configuration, which relaxes expanding swollen find similar linear PNiPAm chains combined - simulation investigation provides new insights into materials interfaces.
منابع مشابه
Monodisperse Thermoresponsive Microgels with Tunable Volume-Phase Transition Kinetics
Stimuli-sensitive hydrogel microspheres or microgels are polymeric particles that consist of cross-linked three-dimensional networks. They shrink or swell significantly by expelling or absorbing large amounts of water in response to external stimuli, such as changes in temperature, pH, electric or magnetic fields. The chemical composition of the microgel determines the stimulus that can trigger...
متن کاملDynamics of interface of gels undergoing volume phase transition
The dynamics of interface of chemical gels undergoing volume phase transition is studied for one-dimensional geometry Permeation of solvent through the interface is taken into account It is shown that the rate determining process of motion of interface is the permeation of solvent through the bulk domains Generalization to three-dimensional case is also discussed.
متن کاملRheological properties of suspensions of thermo-responsive poly(N-isopropylacrylamide) microgels undergoing volume phase transition
The rheological properties of suspensions of thermo-responsive poly(N-isopropylacrylamide) (PNIPAM) microgels are investigated in the swollen and collapsed states using oscillatory and long-time creep measurements. In the swollen state with repulsive interparticle interaction, the zero shear viscosity and quasi-plateau modulus are solely governed by the effective volume fraction (φeff) and are ...
متن کاملHydrogels with a Memory: Dual-Responsive, Organometallic Poly(ionic liquid)s with Hysteretic Volume-Phase Transition
We report on the synthesis and structure-property relations of a novel, dual-responsive organometallic poly(ionic liquid) (PIL), consisting of a poly(ferrocenylsilane) backbone of alternating redox-active, silane-bridged ferrocene units and tetraalkylphosphonium sulfonate moieties in the side groups. This PIL is redox responsive due to the presence of ferrocene in the backbone and also exhibits...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Soft Matter
سال: 2021
ISSN: ['1744-683X', '1744-6848']
DOI: https://doi.org/10.1039/d1sm00111f