- Anisotropic self-assembly of gold nanoparticle grafted with polyisoprene and polystyrene having symmetric polymer composition
-
Methodology to self-assemble metal nanoparticles into three-dimensional mesoscale patterns is a fundamental technique to construct functional materials. Here, we demonstrate that hybridizing an immiscible polymer pair with a metal nanoparticle allows the hybrid to self-assemble in the film, resulting in spontaneous alignment of the nanoparticles at the phase-separated interface formed by the constituent polymers. Organic-inorganic hybrids composed of polyisoprene, polystyrene, and gold nanoparticle were prepared by multistep "grafting-to" method coupled with alkyne-azide click reaction. The polymer composition can be controlled by the feed ratio of gold nanoparticle to azide ligands. The gold nanoparticle hybrid with symmetric polymer composition forms an "alternating lamellar" structure of polyisoprene and polystyrene, where the gold nanoparticles were forced into the phase-separated interfaces.
- Nakano, Tatsuhiro,Kawaguchi, Daisuke,Matsushita, Yushu
-
-
Read Online
- HYBRID NANOPARTICLES CONTAINING DENDRONS, METHODS OF PRODUCING SUCH HYBRID NANOPARTICLES, AND USES THEREOF
-
The present disclosure relates to a hybrid nanoparticle comprising a metallic core and at least one lipophilic dendron attached to the surface of the metallic core, and methods of producing such hybrid nanoparticles. The present disclosure also relates to
- -
-
-
- Reactions in elastomeric nanoreactors reveal the role of force on the kinetics of the Huisgen reaction on surfaces
-
The force dependence of the copper-free Huisgen cycloaddition between an alkyne and a surface-bound azide was examined in elastomeric nanoreactors. These studies revealed that pressure and chain length are critical factors that determine the reaction rate. These experiments demonstrate the central role of pressure and surface structure on interfacial processes that are increasingly important in biology, materials science, and nanotechnology.
- Han, Xu,Bian, Shudan,Liang, Yong,Houk,Braunschweig, Adam B.
-
p. 10553 - 10556
(2014/08/18)
-
- A versatile synthetic strategy for nanoporous gold-organic hybrid materials for electrochemistry and photocatalysis
-
Nanoporous gold (npAu) was employed as high surface area substrate for immobilization of redox- and photooxidative-active organic molecules. A two-step synthetic routine is demonstrated as a versatile and robust method for immobilization of various molecu
- Wichmann, Andre,Schnurpfeil, Günter,Backenk?hler, Jana,Kolke, Lena,Azov, Vladimir A.,W?hrle, Dieter,B?umer, Marcus,Wittstock, Arne
-
p. 6127 - 6133
(2014/12/10)
-
- A versatile synthetic strategy for nanoporous gold-organic hybrid materials for electrochemistry and photocatalysis
-
Nanoporous gold (npAu) was employed as high surface area substrate for immobilization of redox- and photooxidative-active organic molecules. A two-step synthetic routine is demonstrated as a versatile and robust method for immobilization of various molecu
- Wichmann, Andre,Schnurpfeil, Günter,Backenk?hler, Jana,Kolke, Lena,Azov, Vladimir A.,W?hrle, Dieter,B?umer, Marcus,Wittstock, Arne
-
p. 6127 - 6133
(2015/03/30)
-
- Modular synthesis, spectroscopic characterization and in situ functionalization using "click" chemistry of azide terminated amide containing self-assembled monolayers
-
A general and modular synthetic route is developed for the synthesis of azidoalkylthiol molecules, which contain an amide functional group, from common and easily available precursors. SAMs (self-assembled monolayers) formed by these amide containing azidoalkylthiols are characterised by attenuated total reflectance FTIR spectroscopy, X-ray photoelectron spectroscopy, contact angle goniometry and surface enhanced Raman spectroscopy. Signature peaks are identified in the data which allows direct observation of all the functional groups on Au electrodes bearing these monolayers. The terminal azide group is functionalised with electroactive ferrocene group in situ, using "click" chemistry. An alkyne bearing heme derivative is covalently attached using the same technique resulting in O2 reducing electrodes.
- Bandyopadhyay, Sabyasachi,Mukherjee, Sohini,Dey, Abhishek
-
p. 17174 - 17187
(2013/09/24)
-
- Matrix-assisted polymer pen lithography induced Staudinger Ligation
-
The Staudinger Ligation has been combined with Polymer Pen Lithography to create patterns of fluorescent and redox-active inks with 1-micrometer scale feature diameters over centimeter-scale areas. This report presents a straightforward strategy to expand
- Bian, Shudan,Schesing, Kevin B.,Braunschweig, Adam B.
-
p. 4995 - 4997
(2012/06/01)
-
- MOLECULARLY PRINTED POLYMER FOR DETECTING THE PENTRAXIN, AND METHOD FOR PREPARING SAME
-
The present disclosure relates to a molecularly imprinted structure for detection of a pentraxin protein and a method for preparing the same by synthesizing a reactive group-pentraxin protein ligand complex specifically reacting with the pentraxin protein and being polymerizable with a crosslink agent to detect a pentraxin protein by using the complex. The present disclosure also provides a chip for detection of a C-reactive protein and a method for preparing the same, the chip including a molecularly imprinted layer having excellent sensitivity to a C-reactive protein and an improved binding force to a metal substrate by using click chemistry.
- -
-
-
- Selective fluorescence sensing of zinc and mercury ions with hydrophilic 1,2,3-triazolyl fluorene probes
-
The ability to rapidly detect biologically and environmentally significant metal ions such as zinc and mercury is important to study a number of important cellular and environmental processes. Hydrophilic bis(1,2,3-triazolyl)fluorene- based derivatives containing a 1,2,3-triazole-based recognition moiety were synthesized through Click chemistry and characterized by UV-vis absorption, fluorescence emission, and two-photon absorption as new fluorescence sensing probes, selective for Zn2+ and Hg2+ ions. The UV-vis absorption and fluorescence emission spectra of the complexes exhibited blue-shifted absorption and emission spectra upon chelation to Zn2+ and Hg2+ ions, resulting in ca. 2-fold enhancement in fluorescence. Fluorometric titration revealed that 1:2 and 1:3 ligand to metal complexes formed with binding constants of 108 and 1016 for Zn 2+ and Hg2+, respectively. The two-photon absorption cross sections for the probes and probe-metal ion complexes ranged from 200 to 350 GM at 800 nm. These novel fluorescent compounds may have potential as new metal ion sensors to probe cellular and biological environments.
- Nguyen, Dao M.,Frazer, Andrew,Rodriguez, Luis,Belfield, Kevin D.
-
experimental part
p. 3472 - 3481
(2011/12/03)
-
- Highly efficient and recyclable Au nanoparticle-supported palladium(II) interphase catalysts and microwave-assisted alkyne cyclotrimerization reactions in ionic liquids
-
(Graph Presented) The gold nanoparticles with core diameter of 3.9-4.7 nm were stabilized with octanethiolate and dipyridylphosphinicamido undecanethiolate. Without varying the size of central Au cores, palladium complexes were immobilized onto these Au nanoparticles through chelation to the surface-bound dipyridyls. Hybrid catalysts of this type were dissolvable and precipitable, and their structures and reactions were investigated by solution nuclear magnetic resonance (NMR) spectroscopy with a resolution typically attained for soluble systems. These surface-bound Pd(II) complexes were highly effective catalysts for [2+2+2] alkyne cyclotrimerization reactions to give highly congested benzene rings with fairly good selectivity. The catalytic reactivity of these interphase catalysts was even higher than that of their unbound counterparts. In addition, they can be easily separated and quantitatively recovered by simple filtration. The recovered catalysts can be effectively recycled many times and their electron microscopy images and NMR spectra showed negligible difference from those of freshly prepared. The complete transformation by Au-bound Pd(II) catalyst with a loading of 4 mol % can be achieved within 1 h for most alkynes. The same catalysis can be further accelerated in ionic liquid under microwave conditions to give nearly 100% of cyclotrimerized products in minutes.
- Lin, Yu-Yun,Tsai, Shih-Chung,Yu, Shuchun Joyce
-
p. 4920 - 4928
(2008/12/21)
-