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Characterization of Poly(N-isopropylacrylamide) and Magnetic Poly(N-isopropylacrylamide) Latexes
2009Monodisperse poly(N-isopropylacrylamide) (PNIPA) nanogel latexes with temperature and magnetic field sensitivity were prepared and characterized. The phase transition of the latex was characterized by dynamic light scattering. Electrokinetic measurements revealed that the particles have a negative surface charge, which depends on the pH of the swelling
Árpád Némethy +4 more
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Macroporous poly(N-isopropylacrylamide) networks
Polymer Bulletin, 2002Summary Effects of the gel preparation temperature Tprep and the initial monomer concentration c on the swelling and the porosity properties of poly(N-isopropylacrylamide) (PNIPA) networks are described. PNIPA networks were prepared by free-radical crosslinking copolymerization of N-isopropylacrylamide and N,N’-methylene(bis)acrylamide (BAAm) in ...
Cigdem Sayil, Oguz Okay
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Poly(N-isopropylacrylamide)/Poly(dopamine) Capsules
Langmuir, 2014Polymer capsules are an interesting concept considered in nanobiotechnology. Approaches that facilitate their assembly remain sought after. Poly(dopamine) (PDA) has been considered and successfully applied in this context. We recently demonstrated that PDA could be copolymerized with different types of poly(N-isopropylacrylamide) (pNiPAAm) to assemble ...
Zhang, Yan +3 more
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Solution Properties of Poly(N-isopropylacrylamide)
Journal of Macromolecular Science: Part A - Chemistry, 1968Abstract Aqueous solutions of poly(N-isopropyl acrylamide) show a lower critical solution temperature. The thermodynamic properties of the system have been evaluated from the phase diagram and the heat absorbed during phase separation and the phenomenon is ascribed to be primarily due to an entropy effect.
M. Heskins, J. E. Guillet
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Poly(N-isopropylacrylamide) (PNIPAM) is never hydrophobic
Journal of Colloid and Interface Science, 2010PNIPAM chains have hydrophobic and hydrophilic domains below and above the LCST. Temperature dependent interactions between PNIPAM and solutes arise because of changes in the local environment around the hydrophobic isopropyl domains. Below the LCST the isopropyl groups are surrounded by water, whereas above the LCST the hydrophobic groups are in ...
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Dextran permeation through poly(N-isopropylacrylamide) Hydrogels
Journal of Biomaterials Science, Polymer Edition, 1994The permeation of macromolecules such as fluoroescein-labeled dextran fractions through thermally reversible hydrogels has been investigated. A permeation model has been formulated, which takes into account hydrogel porosity and tortuosity as well as the combined effect of a geometric restraint for a relatively large solute molecule at a pore entrance ...
L C, Dong, A S, Hoffman, Q, Yan
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Effects of thermosensitive poly(N-isopropylacrylamide) on blood coagulation
Journal of Materials Chemistry B, 2016Thermosensitive poly(N-isopropylacrylamide) (PNIPAM), hydrophilic below its lower critical solution temperature (LCST) of 32 °C and hydrophobic above it, has been widely used as a drug and gene delivery system with intelligent temperature-responsivity.
Yi, Zhang +5 more
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Salt Effects in the Cononsolvency of Poly(N‐isopropylacrylamide) Microgels
ChemPhysChem, 2010AbstractPoly(N‐isopropylacrylamide) (PNIPAM) is well known to exhibit reentrant behavior or cononsolvency in response to the composition of a mixed solvent consisting of water and a low‐chain alcohol. Since the solvent structure plays an important role in this phenomenon, the presence of structure‐breaking/structure‐making ions in solution is expected ...
Teresa, López-León +3 more
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Cytocompatible Performance of Thermosensitive Poly(N-Isopropylacrylamide) Nanoparticles
Journal of Biomaterials Science, Polymer Edition, 2012The development of biomedical materials with biocompatibility, especially cytocompatibility, is the frontal research field for material science, biology, medicine, pharmacology and related interdisciplines. We have successfully synthesized a new biomedical material, PNIPAM-g-P(NIPAMco-St) (PNNS) core-shell nanoparticles, and investigated its ...
Guo-Hui, Zhang +4 more
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