Journal ArticleDOI
Modification of Gold Surfaces With Water-Soluble (Co)polymers Prepared Via Aqueous Reversible Addition-Fragmentation Chain Transfer (RAFT) Polymerization
Brent S. Sumerlin,Andrew B. Lowe,Paul A. Stroud,Ping Zhang,Marek W. Urban,Charles L. McCormick +5 more
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TLDR
In this paper, the authors reported the immobilization of poly(sodium 4-styrenesulfonate), poly((ar-vinylbenzyl) trimethylammonium chloride), poly(N,N-dimethylacrylamide), and poly(3-[2-(N-methylacrylido)-ethyldimethyl ammonio]propane sulfonate-b-N, N-dimethylamide) onto gold films.Abstract:
Reversible addition−fragmentation chain transfer (RAFT) is a versatile, controlled free radical polymerization technique that operates via a degenerative transfer mechanism in which a thiocarbonylthio compound acts as a chain transfer agent. The subsequent reduction of the dithioester end groups to thiols allows the preparation of (co)polymer-modified gold surfaces. Herein we report the immobilization of poly(sodium 4-styrenesulfonate), poly((ar-vinylbenzyl) trimethylammonium chloride), poly(N,N-dimethylacrylamide), and poly(3-[2-(N-methylacrylamido)-ethyldimethyl ammonio]propane sulfonate-b-N,N-dimethylacrylamide) onto gold films. The presence of the immobilized (co)polymers was confirmed by atomic force microscopy, attenuated total reflectance Fourier transform infrared spectroscopy, and surface contact angle measurements. The gold film modified with the block copolymer demonstrated stimuli-responsive behavior as evidenced by its water contact angle being similar to that of poly(N,N-dimethylacrylamide) ...read more
Citations
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Probing the surface-localized hyperthermia of gold nanoparticles in a microwave field using polymeric thermometers
TL;DR: Reversible addition-fragmentation chain transfer polymerization was employed to synthesize well-defined, functional polymers of predetermined molecular weights, allowing for estimation of the distance between the nanoparticle surface and the polymer chain end.
Journal ArticleDOI
Functionalization of hydrogen-terminated silicon via surface-initiated atom-transfer radical polymerization and derivatization of the polymer brushes.
TL;DR: Kinetic studies confirmed an approximately linear increase in polymer film thickness with reaction time, indicating that chain growth from the surface was a controlled "living" process.
Journal ArticleDOI
Radical Chain End Chemical Transformation of SG1-Based Polystyrenes
Yohann Guillaneuf,Pierre-Emmanuel Dufils,Laurent Autissier,Marion Rollet,Didier Gigmes,Denis Bertin +5 more
TL;DR: In this paper, a radical chain end functionalization of polystyrene previously prepared by NMP using the SG1 nitroxide was investigated and the introduction of a bromine end group was performed by radical bromination under mild conditions using ethyl 2-bromoisobutyrate as brominear transfer agent.
Journal ArticleDOI
Surface Modification of Gd Nanoparticles with pH-Responsive Block Copolymers for Use As Smart MRI Contrast Agents
Liping Zhu,Yuan Yang,Kirsten Farquhar,Jingjing Wang,Chixia Tian,James F. Ranville,Stephen G. Boyes +6 more
TL;DR: P pH-responsive polymers can be used to effectively modify the GdNPs surface to prepare a smart contrast agent for MRI, and are suggested to be used as smart MRI CAs by monitoring the relaxivity changes with changing environmental pH.
Journal ArticleDOI
Biological specific recognition of glycopolymer- modified interfaces by RAFT living radical polymerization
TL;DR: Glycopolymer-substituted gold nanoparticles (GNPs) showed biorecognition abilities and protein-specific aggregation and were utilized for signal amplification of surface plasmon resonance (SPR) to detect protein-saccharide recognition.
References
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Journal ArticleDOI
Formation and Structure of Self-Assembled Monolayers.
TL;DR: Monolayers of alkanethiolates on gold are probably the most studied SAMs to date and offer the needed design flexibility, both at the individual molecular and at the material levels, and offer a vehicle for investigation of specific interactions at interfaces, and of the effect of increasing molecular complexity on the structure and stability of two-dimensional assemblies.
Journal ArticleDOI
Living free-radical polymerization by reversible addition - Fragmentation chain transfer: The RAFT process
John Chiefari,Y. K. Chong,Frances Ercole,Julia Krstina,Justine Leigh Jeffery,Tam P. T. Le,Roshan T. A. Mayadunne,Gordon Francis Meijs,Catherine Louise Moad,Graeme Moad,Ezio Rizzardo,San H. Thang +11 more
TL;DR: The authors proposed a reversible additive-fragmentation chain transfer (RAFT) method for living free-radical polymerization, which can be used with a wide range of monomers and reaction conditions and in each case it provides controlled molecular weight polymers with very narrow polydispersities.
Journal ArticleDOI
Formation of monolayer films by the spontaneous assembly of organic thiols from solution onto gold
Colin D. Bain,E. Barry Troughton,Yu-Tai Tao,Joseph Evall,George M. Whitesides,Ralph G. Nuzzo +5 more
TL;DR: In this paper, the authors used contact angles and optical ellipsometry to study the kinetics of adsorption of monolayer films and to examine the experimental conditions necessary for the formation of high-quality films.
Journal ArticleDOI
Biological surface science
TL;DR: Biological surface science (BioSS) as discussed by the authors is a broad interdisciplinary area where properties and processes at interfaces between synthetic materials and biological environments are investigated and bio functional surfaces are fabricated.
Journal ArticleDOI
A reversibly switching surface.
Joerg Lahann,Samir Mitragotri,Thanh-Nga T. Tran,Hiroki Kaido,Jagannathan Sundaram,Insung S. Choi,Saskia Hoffer,Gabor A. Somorjai,Robert Langer +8 more
TL;DR: The design of surfaces that exhibit dynamic changes in interfacial properties, such as wettability, in response to an electrical potential are reported, which enables amplification of molecular-level conformational transitions to macroscopic changes in surface properties without altering the chemical identity of the surface.