نتایج جستجو برای: nipam polymer

تعداد نتایج: 93135  

2015
G. Roshan Deen Vivien Chua Dirk Kuckling

Hydrogel nanocomposites containing silver nanoparticles of size 15–21 nm were prepared by diffusion and in-situ chemical reduction in chemically crosslinked polymers based on N-acryloyl-N′-ethyl piperazine (AcrNEP) and N-isopropylacrylamide (NIPAM). The polymer chains of the hydrogel network offered control and stabilization of silver nanoparticles without the need for additional stabilizers. T...

2008
Jun-Hyun Kim

This paper describes the preparation and characterization of a new type of composite nanoparticle, where the structure consists of a nontoxic hydrogel polymer network that encapsulates a gold shell/silica core. These composite nanoparticles are being developed as photothermally responsive drug-delivery vehicles that undergo structural changes slightly above physiological temperature. A unique p...

Journal: :International Journal of Nanomedicine 2007
Jim Moselhy Swapna Sarkar Maria C Chia Joseph D Mocanu Nicolas Taulier Fei-Fei Liu Xiao Yu Wu

Copolymers of 2-dimethyl(aminoethyl) methacrylate (PDMAEM) with N-isopropylacrylamide (NIPAM) were evaluated for their potential to enhance transgene expression of plasmid DNA (pDNA) and gene delivery by adenovirus vectors. The polymers of varying compositions and molecular weights (MW) were synthesized by free-radical polymerization. Polyelectrolyte complexes (PECs) were prepared with differen...

2013
Cheng-Ting Shih Jui-Ting Hsu Rou-Ping Han Bor-Tsung Hsieh Shu-Jun Chang Jay Wu

Polymer gels are regarded as a potential dosimeter for independent validation of absorbed doses in clinical radiotherapy. Several imaging modalities have been used to convert radiation-induced polymerization to absorbed doses from a macro-scale viewpoint. This study developed a novel dose conversion mechanism by texture analysis of scanning electron microscopy (SEM) images. The modified N-isopr...

Journal: :Aquatic toxicology 2009
Pratap C Naha Alan Casey Tiziana Tenuta Iseult Lynch Kenneth A Dawson Hugh J Byrne Maria Davoren

Poly N-isopropylacrylamide and N-isopropylacrylamide/N-tert-butylacrylamide copolymer nanoparticles of 50-70 nm were prepared by free radical polymerisation. The particle sizes of the copolymer nanoparticles were measured in the test media Milli-Q water, Algae Media, Daphnia Media and Microtox Diluent as a function of temperature. Whereas in Milli-Q water the particle size was seen to decrease ...

Journal: :Journal of the Royal Society, Interface 2012
James W Lapworth Paul V Hatton Rebecca L Goodchild Stephen Rimmer

Healthy cells are required in large numbers to form a tissue-engineered construct and primary cells must therefore be increased in number in a process termed 'expansion'. There are significant problems with existing procedures, including cell injury and an associated loss of phenotype, but three-dimensional culture has been reported to offer a solution. Reversible gels, which allow for the reco...

2017
Wei-Qing Kong Cun-Dian Gao Shu-Feng Hu Jun-Li Ren Li-Hong Zhao Run-Cang Sun

Among the natural macromolecules potentially used as the scaffold material in hydrogels, xylan has aroused great interest in many fields because of its biocompatibility, low toxicity, and biodegradability. In this work, new pH and thermoresponsive hydrogels were prepared by the cross-linking polymerization of maleic anhydride-modified xylan (MAHX) with N-isopropylacrylamide (NIPAm) and acrylic ...

2010
Alan F Tominey Julia Liese Sun Wei Klaus Kowski Thomas Schrader Arno Kraft

A new family of linear polymers with pronounced affinity for arginine- and lysine-rich proteins has been created. To this end, N-isopropylacrylamide (NIPAM) was copolymerized in water with a binding monomer and a hydrophobic comonomer using a living radical polymerization (RAFT). The resulting copolymers were water-soluble and displayed narrow polydispersities. They formed tight complexes with ...

Journal: :IOP Conference Series: Materials Science and Engineering 2014

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