Molecular thermodynamic model for swelling behavior and volume phase transition of multi-responsive hydrogels

2011 ◽  
Vol 312 ◽  
pp. 106-115 ◽  
Author(s):  
Dongyan Zhi ◽  
Yongmin Huang ◽  
Shouhong Xu ◽  
Honglai Liu ◽  
Ying Hu
Keyword(s):  
Phase Transition ◽  
Thermodynamic Model ◽  
Swelling Behavior ◽  
Volume Phase Transition ◽  
Volume Phase ◽  
Responsive Hydrogels

scholarly journals 3D shape change of multi-responsive hydrogels based on a light-programmed gradient in volume phase transition

2018 ◽  
Vol 54 (77) ◽  
pp. 10909-10912 ◽  
Author(s):  
Zhen Jiang ◽  
Ronny Javier Pibaque Sanchez ◽  
Idriss Blakey ◽  
Andrew K. Whittaker
Keyword(s):  
Phase Transition ◽  
Ethylene Glycol ◽  
Shape Change ◽  
Deformation Behaviour ◽  
Volume Phase Transition ◽  
Glycol Methacrylate ◽  
Volume Phase ◽  
New Type ◽  
3D Deformation ◽  
Responsive Hydrogels

We present a new type of anisotropic oligo(ethylene glycol) methacrylate hydrogel with multi-responsive and programmable 3D deformation behaviour.

Swelling behavior of amphoteric gel and the volume phase transition

1992 ◽  
Vol 96 (11) ◽  
pp. 4698-4701 ◽  
Author(s):  
Seiji Katayama ◽  
Akira Myoga ◽  
Yukio Akahori
Keyword(s):  
Phase Transition ◽  
Swelling Behavior ◽  
Volume Phase Transition ◽  
Volume Phase

Triply-responsive OEG-based microgels and hydrogels: Regulation of swelling ratio, volume phase transition temperatures and mechanical properties

2021 ◽  
Author(s):  
Dongdong Lu ◽  
Mingning Zhu ◽  
Jing Jin ◽  
Brian R. Saunders
Keyword(s):  
Phase Transition ◽  
Biomedical Engineering ◽  
Volume Phase Transition ◽  
Swelling Ratio ◽  
Transition Temperatures ◽  
Ph Responsive ◽  
Network Systems ◽  
Volume Phase ◽  
Phase Transition Temperatures ◽  
Volume Swelling

Thermally- and pH-responsive microgels (MGs) and hydrogels are fascinating network systems that have been applied in biomedical engineering and sensing. The volume-swelling ratio (Q) and the volume-phase transition temperatures (VPTTs)...

scholarly journals Accounting for Cooperativity in the Thermotropic Volume Phase Transition of Smart Microgels

Gels ◽  
2021 ◽  
Vol 7 (2) ◽  
pp. 42
Author(s):  
Simon Friesen ◽  
Yvonne Hannappel ◽  
Sergej Kakorin ◽  
Thomas Hellweg
Keyword(s):  
Phase Transition ◽  
Interaction Parameter ◽  
Quantitative Description ◽  
Water Molecules ◽  
Volume Phase Transition ◽  
Network Chain ◽  
Solvent Interaction ◽  
Volume Phase ◽  
The Cross ◽  
Interaction Parameter Χ

A full quantitative description of the swelling of smart microgels is still problematic in many cases. The original approach of Flory and Huggins for the monomer–solvent interaction parameter χ cannot be applied to some microgels. The reason for this obviously is that the cross-linking enhances the cooperativity of the volume phase transitions, since all meshes of the network are mechanically coupled. This was ignored in previous approaches, arguing with distinct transition temperatures for different meshes to describe the continuous character of the transition of microgels. Here, we adjust the swelling curves of a series of smart microgels using the Flory–Rehner description, where the polymer–solvent interaction parameter χ is modeled by a Hill-like equation for a cooperative thermotropic transition. This leads to a very good description of all measured microgel swelling curves and yields the physically meaningful Hill parameter ν. A linear decrease of ν is found with increasing concentration of the cross-linker N,N′-methylenebisacrylamide in the microgel particles p(NIPAM), p(NNPAM), and p(NIPMAM). The linearity suggests that the Hill parameter ν corresponds to the number of water molecules per network chain that cooperatively leave the chain at the volume phase transition. Driven by entropy, ν water molecules of the solvate become cooperatively “free” and leave the polymer network.

Influence of volume phase transition phenomena on the behavior of hydrogel-based valves

2004 ◽  
Vol 99 (2-3) ◽  
pp. 451-458 ◽  
Author(s):  
Andreas Richter ◽  
Steffen Howitz ◽  
Dirk Kuckling ◽  
Karl-Friedrich Arndt
Keyword(s):  
Phase Transition ◽  
Volume Phase Transition ◽  
Volume Phase
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