Results 181 to 190 of about 4,470 (211)

Mechanical and rheological behavior of pNIPAAM crosslinked macrohydrogel

Reactive and Functional Polymers, 2013
In this study for the first time we investigate the most common reticulated N-isopropylacrylamide (pNIPAAM) macrohydrogel for both its mechanical response and shear rheological behavior in time and frequency domains. Hydrogels are characterized by water content volume and weight measurements, FT-IR spectroscopy, scanning electron microscopy and ...
Puleo G. L., Zulli F., Piovanelli M., GIORDANO, MARCO, Mazzolai B., Beccai L., ANDREOZZI, LAURA   +6 more
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Protein Resistance of PNIPAAm Brushes: Application to Switchable Protein Adsorption

Langmuir, 2009
Protein adsorption, as the primary process occurring when a foreign surface comes into contact with a biosystem, was studied on thin polymer brush films consisting of poly(N-isopropylacrylamide) (PNIPAAm) and poly(2-vinylpyridine) (P2VP). These films were prepared by the "grafting to" method. The protein resistance of stimuli responsive PNIPAAm-brushes
Sina, Burkert, Eva, Bittrich, Marco, Kuntzsch, Martin, Müller, Klaus-Jochen, Eichhorn, Cornelia, Bellmann, Petra, Uhlmann, Manfred, Stamm   +7 more
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Preparation and Characterization of Photo-Cross-Linked Thermosensitive PNIPAAm Nanogels

Macromolecules, 2006
Thermosensitive nanogels were prepared from photo-cross-linkable copolymers of N-isopropyl-acrylamide (NIPAAm) and 2-dimethylmaleinimido ethylacrylamide (DMIAAm). The colloidal nanogels were formed by UV-irradiated solutions of thermosensitive polymers in water at 45 °C.
Ruckling, D., Vo, C. D., Adler, H. J P, Völkel, A., Cölfen, H.   +4 more
openaire   +3 more sources

Determination of the Optical Properties of PNIPAAm Gels Used In Biological Applications

Therapeutic Laser Applications and Laser-Tissue Interactions IV, 2009
Poly(N-isopropylacrylamide) i.e. PNIPAAm is a temperature sensitive smart material which displays a lower critical solution temperature (LCST) at 33–35°C. At the lower critical solution temperature, the gel changes from hydrophilic to hydrophobic which has significant consequences in cell culturing.
A. Singh, A. E. Karsten, I. Mputle, A. Chetty, Kersch Naidoo   +4 more
openaire   +1 more source

Thermo-sensitive hydrogels membranes from PAAm networks and entangled PNIPAAm: effect of temperature, cross-linking and PNIPAAm contents on the water uptake and permeability

Reactive and Functional Polymers, 2004
Abstract In this work is presented an alternative route for preparation of membranes from thermo-sensitive hydrogels based on polyacrylamide (PAAm), network having poly(N-isopropylacrylamide) (PNIPAAm) entangled. The hydrogels were chemically synthesized by radical polymerisation using sodium persulfate as initiator.
Guilherme, Marcos Rogério, Da Silva, Rodrigo Cardoso, Rubira, Adley F., Geuskens, Georges, Muniz, Edvani C.   +4 more
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Fabrication and characterization of microgel-impregnated, thermosensitive PNIPAAm hydrogels

Polymer, 2005
Abstract Poly(N-isopropylacrylamide)/poly(ethylene glycol) diacrylate (PNIPAAm/PEG-DA) microgels were used as an additive during the polymerization and/or crosslinking of PNIPAAm hydrogels to improve their thermosensitive properties. The influence of this additive on the property of resulting PNIPAAm hydrogels was investigated and characterized.
Xian-Zheng Zhang, Chih-Chang Chu
openaire   +1 more source

Dextran-grafted-PNIPAAm as an artificial chaperone for protein refolding

Biochemical Engineering Journal, 2006
A temperature stimuli-responsive polymer, dextran-grafted-PNIPAAm (DGP), was prepared by radical polymerization using cerium nitrate as the initiator. The structure and the grafting ratio of DGP were determined by FT-IR and elemental analysis. The temperature-stimuli responsive behavior of DGP and the size of the DGP self-assemblies at different ...
Diannan Lu, Zhixia Liu, Minlian Zhang, Xiaogong Wang, Zheng Liu   +4 more
openaire   +1 more source

PNIPAAM Immobilized Nanoparticles for Posterior Ocular Delivery

2020
Master of Applied Science (MASc)
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Bioinspired MXene@PNIPAAm Composite Enables Switchable Microwave Absorption

ACS Applied Materials & Interfaces
Stimuli-responsive microwave absorbing (MA) materials are highly desirable for next-generation electromagnetic interference protection systems, as they enable adaptive regulation of electromagnetic responses under dynamic service conditions. Herein, a bioinspired temperature-responsive composite based on Ti3C2Tx MXene and poly(N-isopropylacrylamide ...
Wei Feng, Linlin Zhao, Xialong Cai, Rongling Zhang, Yujie Wang, Siyu Chen, Zhiyong Chen, Xulin Yang, Pan Wang, Wei Feng, Hanjun Wei, Ying Li   +11 more
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Novel ABA type gold copolymer nanoparticles: PNIPAAm-b-PU-b-PNIPAAm tri-block nanopolymer as reducing and stabilizing agent

AIP Conference Proceedings, 2012
Block copolymers have been used extensively in the synthesis of different types of nanoparticles. A novel ABA type tri-block nanopolymer PNIPAAm-b-PU-b-PNIPAAm has been synthesized via atom transfer radical polymerization (ATRP) technique, using a tertiary bromo-terminated as a macroinitiator.
Prashant Singh, Hemant Verma, Chaitnaya Kumar, Kamlesh Kumari, Gopal K. Mehrotra, Ramesh Chandra, K. Tharanikkarrasu   +6 more
openaire   +1 more source