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
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The nucleophilic, phosphine-catalyzed thiol―ene click reaction and convergent star synthesis with RAFT-prepared homopolymers
TL;DR: In this article, the synthesis of 3-arm star polymers from reversible addition-fragmentation chain transfer (RAFT)-prepared precursor homopolymers in combination with thiol-ene click chemistry is described.
Journal ArticleDOI
Thermal Decomposition of Dithioesters and Its Effect on RAFT Polymerization
TL;DR: In this article, thermal decomposition of dithioesters, e.g., cumyl dithiobenzoate (CDB), poly(methyl methacrylate) (PMMA) end-capped with Dithioester, and 2-(ethoxycarbonyl)prop-2-yl DithIobenzosate (EPDB), and the consequent effect on reversible additionfragmentation chain transfer polymerization were investigated.
Journal ArticleDOI
Tunable nanolubrication between dual-responsive polyionic grafts.
Niklas Nordgren,Mark W. Rutland +1 more
TL;DR: This study reports on a direct approach of quantitatively probing the nanotribological response of chemically end-grafted polyions through a combination of a quartz crystal microbalance with dissipation and atomic force microscopy to investigate the stimuli-induced lubrication behavior between poly(2-(dimethylamino)ethyl methacrylate) grafts on gold.
Journal ArticleDOI
RAFT-Polymers with Single and Multiple Trithiocarbonate Groups as Uniform Gold-Nanoparticle Coatings
Bastian Ebeling,Philipp Vana +1 more
TL;DR: In this article, the nanostructures of nanohybrids with gold-nanocrystal cores and shells of N-isopropylacrylamide polymers containing single or multiple trithiocarbonate (TTC) groups were analyzed in detail.
Journal ArticleDOI
Stimuli-responsive polymer nano-science: Shape anisotropy, responsiveness, applications
Chunliang Lu,Marek W. Urban +1 more
TL;DR: In this article, a review of the development of stimuli-responsive nanomaterials is presented, including core-shell, hollow, Janus, and gibbous/inverse gibberous nanoparticles.
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.
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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.