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The Sadtler Handbook Of Infrared Spectra
01 Aug 1978-
About: The article was published on 1978-08-01 and is currently open access. It has received 222 citations till now. The article focuses on the topics: Infrared spectroscopy.
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TL;DR: The results showed that human plasma fibrinogen can be readily displaced from the interface by other plasma proteins near neutral pH because the positively charged alpha C domains on HPF sit between the rest of the macromolecule and the underlying surface.
Abstract: The molecular level details of the displacement of surface adsorbed fibrinogen from silica substrates were studied by atomic force microscopy, immunochemical assays, fluorescence microscopy, and vibrational sum frequency spectroscopy. The results showed that human plasma fibrinogen (HPF) can be readily displaced from the interface by other plasma proteins near neutral pH because the positively charged αC domains on HPF sit between the rest of the macromolecule and the underlying surface. The αC domains make weak electrostatic contact with the substrate, which is manifest by a high degree of alignment of Lys and Arg residues. Upon cycling through acidic pH, however, the αC domains are irreversibly removed from this position and the rest of the macromolecule is free to engage in stronger hydrogen bonding, van der Waals, and hydrophobic interactions with the surface. This results in a 170-fold decrease in the rate at which HPF can be displaced from the interface by other proteins in human plasma.
290 citations
241 citations
TL;DR: In this article, a monodisperse polyaniline@cadmium sulfide (PANI@CdS) core-shell nanospheres were designed and synthesized to probe the mechanisms of photocorrosion inhibition and photocatalytic H2 production.
Abstract: CdS is a very good visible-light responsive photocatalyst for hydrogen production. However, the fast recombination of photogenerated electron-hole pairs and quick photocorrosion limit its application in photocatalysis. To address these problems, we herein have designed and synthesized monodisperse polyaniline@cadmium sulfide (PANI@CdS) core-shell nanospheres to probe the mechanisms of photocorrosion inhibition and photocatalytic H2 production. All the PANI@CdS core-shell nanospheres demonstrate highly enhanced photocorrosion inhibition and photocatalytic hydrogen production comparing to the pure CdS nanospheres. Particularly, the PANI@CdS core-shell nanospheres with the thinnest PANI shell possess the highest hydrogen production rate of 310 μmol h−1 g−1 in 30 h without deactivation. Our results reveal that the newly formed C S and/or N Cd bonds in PANI@CdS prevent the reduction of the surface sulfide ions to sulphur, leading to effective photocorrosion inhibition. Our results also verify that the photogenerated holes migrating from valence band (VB) of CdS to the highest occupied molecular orbital (HOMO) of PANI leads to the enhanced photocatalytic hydrogen production. This work can shed some light on the mechanism of conducting polymers modifying metal sulfides for effective photocorrosion inhibition and highly enhanced photocatalytic activities.
208 citations
TL;DR: Synthesis of SiC nanoparticles with diameters of tens of nanometers shows emission in the blue-to-UV range and the observed emissions can be ascribed to some surface or defect states in the SiC nanostructures.
Abstract: Quantum dots are superior to dye molecules in many aspects from size-tunable fluorescence and resistance to photobleaching and they have thus been widely used in biology as fluorescent probes. However, the cytotoxicity of some quantum dots limits their use in biological systems, and exploiting green nanoparticles with low cytotoxicity has become one major concern in this field. Silicon carbide, one well-known power electronic semiconductor material, is considered one of the best biocompatible materials, especially to blood. In addition, it has superior properties such as low density, high hardness, high strength, and chemical inertness. In recent years, much effort has been made to synthesize nanocrystalline SiC and study its photoluminescence (PL) properties. Some synthesized SiC nanostructures showed emission in the blue-to-UV range with their properties depending sensitively on the fabrication method and even on specific experiments. Although some variations have been reported, in general the observed emissions can be ascribed to some surface or defect states in the SiC nanostructures. However, owing to their relatively large size, low emission intensity, lack of controlled synthesis, and variable optical properties, these interconnected SiC nanostructures can hardly be used as fluorescent biological labels. Kassiba and co-workers synthesized SiC nanoparticles with diameters of tens of nanometers
175 citations
TL;DR: It was found that lower surface energy leads to lower ice adhesion regardless of theroughness, while the roughness plays a more complicated role, and the anti-icing performance is closely related to the antiwetting property of the surfaces at subzero temperatures.
Abstract: Sol–gel coatings with different roughness and surface energy were prepared on glass substrates. Methyl triethoxysilane (MTEOS), 3-Glycidyloxypropyl trimethoxysilane (GLYMO) and fluoroalkylsilane (FAS) were used to obtain a mechanically robust icephobic coating. Different amount of hydrophobic silica nano particles was added as fillers to introduce different roughness and surface energy to the coatings. The microstructure, roughness, and surface energy, together with elemental information and surface chemical state, were investigated at room temperature. The contact angle and sliding angle were measured at different temperatures to correlate the wetting behavior at low temperature with the anti-icing performance. The ice adhesion shear strength was measured inside an ice chamber using a self-designed tester. The factors influencing the ice adhesion were discussed, and the optimum anti-icing performance found in the series of coatings. It was found that lower surface energy leads to lower ice adhesion regar...
143 citations