نتایج جستجو برای: nipam polymer

تعداد نتایج: 93135  

Journal: :Nanoscale 2014
Hui Wang Jinhui Yi Sumit Mukherjee Probal Banerjee Shuiqin Zhou

The paper demonstrates a class of multifunctional core-shell hybrid nanogels with fluorescent and magnetic properties, which have been successfully developed for simultaneous optical temperature sensing, tumor cell imaging and magnetic/NIR-thermally responsive drug carriers. The as-synthesized hybrid nanogels were designed by coating bifunctional nanoparticles (BFNPs, fluorescent carbon dots em...

Journal: :Journal of the American Chemical Society 2001
R P Washington O Steinbock

The study of hydrogels and their response to external environment is of special interest because of their potential as drug delivery systems,1,2 actuators,3 and separation devices.4,5 Temperature-sensitive hydrogels undergo a reversible swellingdeswelling transition with a small change of temperature near the phase transition point.6 A frequently studied thermosensitive hydrogel is based on sol...

Journal: :The journal of physical chemistry. B 2006
Teresa López-León Juan L Ortega-Vinuesa Delfi Bastos-Gonzalez Abdelhamid Elaïssari

A cationic and an anionic poly(N-isopropylacrylamide) (poly(NIPAM)) microgel latex were synthesized via batch radical polymerization under emulsifier-free conditions. The hydrodynamic properties, colloidal stability, and electrokinetic characteristics of these two samples were studied. The hydrodynamic particle size variation was discussed by considering the effect of salinity and temperature o...

Journal: :Soft matter 2016
Samantha Micciulla Olaf Soltwedel Oliver Löhmann Regine von Klitzing

The complex interaction of polyelectrolyte multilayers (PEMs) physisorbed onto end-grafted polymer brushes with focus on the temperature-responsive behavior of the system is addressed in this work. The investigated brush/multilayer composite consists of a poly(styrene sulfonate)/poly(diallyldimethylammonium chloride) (PSS/PDADMAC) multilayer deposited onto the poly(N-isopropylacrylamide-b-dimet...

2017
Shuiqin Niu Ling-Kun Zhang Li Zhang Siyi Zhuang Xiuyu Zhan Wu-Ya Chen Shiwei Du Liang Yin Rong You Chu-Hua Li Yan-Qing Guan

Lewy bodies are considered as the main pathological characteristics of Parkinson's disease (PD). The major component of Lewy bodies is α-synuclein (α-syn). The use of gene therapy that targeting and effectively interfere with the expression of α-syn in neurons has received tremendous attention. In this study, we used magnetic Fe3O4 nanoparticles coated with oleic acid molecules as a nano-carrie...

2017
Lies A. L. Fliervoet Marzieh Najafi Mathew Hembury Tina Vermonden

ABC triblock copolymers with a poly(ethylene glycol) (PEG) midblock have attractive properties for biomedical applications because of PEG's favorable properties regarding biocompatibility and hydrophilicity. However, easy strategies to synthesize polymers containing a PEG midblock are limited. In this study, the successful synthesis of a heterofunctional PEG macroinitiator containing both an az...

Journal: :Macromolecular rapid communications 2015
Anthony L B Maçon Sarah L Greasley C Remzi Becer Julian R Jones

Reversible addition-fragmentation chain transfer (RAFT) polymerization and characterization of an alkoxysilane acrylamide monomer using a trithiocarbonate chain transfer agent are described. Poly(N-[3-(trimethoxysilyl)propyl]acrylamide) (PTMSPAA) homopolymers are obtained with good control over the polymerization. A linear increase in the molecular weight is observed whereas the polydispersity ...

Journal: :Journal of the American Chemical Society 2003
Georg Garnweitner Bernd Smarsly Roger Assink Wilhelm Ruland Evelyn Bond C Jeffrey Brinker

Thermoresponsive nanocomposite thin films composed of alternating layers of silica and polymerized N-isopropylacrylamide (NIPAM) or NIPAM plus dodecyl methacrylate (DM) hydrogels were prepared by surfactant-directed evaporation-induced self-assembly (EISA). During EISA, the organic monomers partition within the hydrophobic domains of a lamellar mesophase. In-situ polymerization via a free radic...

Journal: :The journal of physical chemistry. B 2009
Zeeshan Ahmed Edward A Gooding Konstantin V Pimenov Luling Wang Sanford A Asher

Poly(N-isopropylacrylamide) (PNIPAM) is the premier example of a macromolecule that undergoes a hydrophobic collapse when heated above its lower critical solution temperature (LCST). Here we utilize dynamic light scattering, H-NMR, and steady-state and time-resolved UVRR measurements to determine the molecular mechanism of PNIPAM's hydrophobic collapse. Our steady-state results indicate that in...

Journal: :Biomaterials 2013
Haie Zhu Juan Tao Wenhao Wang Yingjie Zhou Penghui Li Zheng Li Kai Yan Shuilin Wu Kelvin W K Yeung Zushun Xu Haibo Xu Paul K Chu

Multifunctional colloidal nanoparticles which exhibit fluorescence, superparamagnetism, and thermosensitivity are produced by two step seed emulsifier-free emulsion polymerization in the presence of oleic acid (OA) and sodium undecylenate (NaUA) modified Fe(3)O(4) nanoparticles. In the first step, St and NIPAM polymerize the NaUA on the surface of Fe(3)O(4) nanoparticles to form Fe(3)O(4)/poly(...

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