Poly(N-isopropylacrylamide) microgels at the oil–water interface: temperature effect

Soft Matter ◽  
2014 ◽  
Vol 10 (33) ◽  
pp. 6182-6191 ◽  
Author(s):  
Zifu Li ◽  
Walter Richtering ◽  
To Ngai
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Interfacial Tension ◽  
Temperature Effect ◽  
Phase Transition Temperature ◽  
Interface Temperature ◽  
Volume Phase Transition ◽  
Water Interface ◽  
Early States ◽  
Oil Water

The heptane–water interfacial tension exhibits a minimum in the presence of PNIPAM microgels, particularly in the vicinity of the volume phase transition temperature (VPTT) of PNIPAM microgels. The origin of such interfacial tension minima contributes to the microgel spreading at the oil–water interface in the early states and is then governed by the microgels' packing and interactions in the final static equilibrium states.

A redox-labile poly(oligo(ethylene glycol)methacrylate)-based nanogel with tunable thermosensitivity for drug delivery

2016 ◽  
Vol 7 (10) ◽  
pp. 1913-1921 ◽  
Author(s):  
Yefei Tian ◽  
Shanshan Bian ◽  
Wuli Yang
Keyword(s):  
Phase Transition ◽  
Drug Delivery ◽  
Transition Temperature ◽  
Ethylene Glycol ◽  
Phase Transition Temperature ◽  
Precipitation Polymerization ◽  
Volume Phase Transition ◽  
Glycol Methacrylate ◽  
Volume Phase ◽  
Volume Phase Transition Temperature

We developed a redox degradable P(MEO2MA-s-s-OEGMA) nanogel with tunable volume phase transition temperature for drug delivery via precipitation polymerization using a disulfide-containing crosslinker.

scholarly journals Thermoresponsive Behavior of Magnetic Nanoparticle Complexed pNIPAm-co-AAc Microgels

2018 ◽  
Vol 8 (10) ◽  
pp. 1984 ◽  
Author(s):  
Su-Kyoung Lee ◽  
Yongdoo Park ◽  
Jongseong Kim
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Magnetic Nanoparticles ◽  
Phase Transition Temperature ◽  
Functional Materials ◽  
Inorganic Nanoparticles ◽  
Temperature Hysteresis ◽  
Volume Phase Transition ◽  
Volume Phase ◽  
Volume Phase Transition Temperature

Characterization of responsive hydrogels and their enhancement with novel moieties have improved our understanding of functional materials. Hydrogels coupled with inorganic nanoparticles have been sought for novel types of responsive materials, but the efficient routes for the formation and the responsivity of complexed materials remain for further investigation. Here, we report that responsive poly(N-isopropylacrylamide-co-acrylic acid) (pNIPAm-co-AAc) hydrogel microparticles (microgels) are tunable by varying composition of co-monomer and crosslinker as well as by their complexation with magnetic nanoparticles in aqueous dispersions. Our results show that the hydrodynamic diameter and thermoresponsivity of microgels are closely related with the composition of anionic co-monomer, AAc and crosslinker, N,N′-Methylenebisacrylamide (BIS). As a composition of hydrogels, the higher AAc increases the swelling size of the microgels and the volume phase transition temperature (VPTT), but the higher BIS decreases the size with no apparent effect on the VPTT. When the anionic microgels are complexed with amine-modified magnetic nanoparticles (aMNP) via electrostatic interaction, the microgels decrease in diameter at 25 °C and shift the volume phase transition temperature (VPTT) to a higher temperature. Hysteresis on the thermoresponsive behavior of microgels is also measured to validate the utility of aMNP-microgel complexation. These results suggest a simple, yet valuable route for development of advanced responsive microgels, which hints at the formation of soft nanomaterials enhanced by inorganic nanoparticles.

Changes in the volume phase transition temperature of hydrogels for detection of the DNA hybridization process

The Analyst ◽  
2016 ◽  
Vol 141 (20) ◽  
pp. 5815-5821 ◽  
Author(s):  
Klaudia Kaniewska ◽  
Agata Kowalczyk ◽  
Marcin Karbarz ◽  
Anna M. Nowicka
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Phase Transition Temperature ◽  
Dna Hybridization ◽  
Volume Phase Transition ◽  
Volume Phase ◽  
Volume Phase Transition Temperature ◽  
Target Dna ◽  
Thermoresponsive Hydrogels

A simple biosensing platform which involves the application of thermoresponsive hydrogels for the biochemical recognition of target DNA is presented.

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