Materials Literature
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We consider single two-dimensional aggregates containing glass particles trapped at a water/oil or water/air interface. Two modes for aggregate break-up are observed: break-up by fragmentation into a few parts and break-up by erosion of single particles. We have studied the critical shear rate for these modes as a fun…
The demonstration of stereoselective habit modification in molecular crystals using “tailor-made” (or structurally related) additives, over the last two decades, has been a milestone in understanding the phenomenon of molecular recognition at crystal interfaces. The centrosymmetric α-glycine crystal has provided a cla…
We report on photon-assisted tunneling (PAT) experiments in a carbon nanotube quantum dot using microwave frequencies between 20 and 60 GHz. In addition to the basic PAT effect, revealed by the appearance of two extra resonances in the current through the dot, we use PAT for spectroscopy of excited states. The experim…
A room temperature, template-free, wet chemical synthesis of ceria nanoparticles and their long term ageing characteristics are reported. High resolution transmission electron microscopy and UV-visible spectroscopy techniques are used to observe the variation in size, structure and oxidation state, respectively as a f…
The reactions of CO, NO, and NO with CO have been studied on Pt, Rh, and bimetallic Pt−Rh clusters deposited on TiO 2 (110). The following four cluster surfaces were investigated: 4 ML of Rh, 4 ML of Pt, 2 ML of Rh + 2 ML of Pt (Rh + Pt), and 2 ML of Pt + 2 ML of Rh (Pt + Rh). Scanning tunneling microscopy studies dem…
Heat treatment of various compositions of AgNO(3)-doped polyvinylpyrrolidone (PVP) composite nanofibres fabricated by electrospinning produced two kinds of silver species: (i) Ag nanoparticles dispersed in PVP nanofibres, when the loading of AgNO(3) was 5 wt%, and (ii) a net-like silver nanofibre film when the loading…
Cyclic voltammetry on the octahedral rhodium clusters with 12 bridging hydride ligands, [Rh6(PR3)6H12][BArF4]2 (R = Cy Cy-[H12]2+, R = iPr iPr-[H12]2+; [BArF4]- = [B{C6H3(CF3)2}4]-) reveals four potentially accessible redox states: [Rh6(PR3)6H12]0/1+/2+/3+. Chemical oxidation did not produce stable species, but reduct…
Colloidal particles that interact through strong, short-range, secondary attractions in liquids form irreversible "slippery" bonds that are not shear-rigid. Through event-driven simulations of slippery attractive spheres, we show that space-filling fractal clusters still emerge from the process of "slippery" diffusion…
The biosynthesis of methionine is an attractive antibiotic target given its importance in protein and DNA metabolism and its absence in mammals. We have performed a high-throughput screen of the methionine biosynthesis enzyme cystathionine beta-lyase (CBL) against a library of 50 000 small molecules and have identifie…
The uniquely shaped spiropyran dimer, BIPSD, has been synthesized. BIPSD showed reversible transformation between spiro (Sp) and merocyanine (MC) forms under UV/visible light and change in temperature. Over-irradiation of UV produced stacking aggregates of MC forms, which were insoluble in most solvents and slowly ret…
Abstract A series of stable and inert complexes with Er III cores and dendritic Pt II ‐porphyrin ligands exhibit strong near‐IR (NIR) emission bands via highly efficient energy transfer from the excited triplet state of the Pt II ‐porphyrin ligand to Er 3+ ions. The NIR emission intensity of thin films of Er III compl…
Hydrothermal treatments are used to reform Fe/MgO catalysts into lamella-like Fe/Mg(OH) 2 catalysts, resulting in specific surface areas (SSAs) of more than 100 m 2 /g. Porous and lamella-like Fe/MgO catalyst can be obtained under the reaction condition. In the materials prepared by CH 4 cracking at 850 °C over the hy…
Enhanced digital video microscopy is applied to study the equilibrium structure of a two-dimensional charged sulfate-polystyrene particle (2 mum in diameter) monolayer at decane/water interfaces. When the surface density is decreased, a sequential phase transition, pure solid phase-->pure hexatic phase-->liquid-hexati…
Self-assembly of complex nanostructured building units into larger configurations is a challenging area in the synthesis and design of nanomaterials. In this work, we synthesized and organized a new type of ZnO nanostructure using a wet chemical approach. The complex ZnO building block synthesized is actually a struct…
Propylsulfonic acid-functionalized mesoporous silica was prepared through in situ oxidization of mercaptopropyl groups with H 2 O 2 during a template-free condensation of tetraethyl orthosilicate (TEOS) and 3-mercaptopropyltrimethoxysilane (MPTMS) under strong acidic condition. The obtained materials with 3−15 mol % l…
ZnO nanoporous structures were prepared on Cu substrates by electrochemical deposition in solutions of ZnCl 2 + ethylenediaminetetraacetic acid (EDTA) at a temperature of 90 °C. Cyclic voltammetry was used to study the electrochemical reactions relevant to the film growth. The transfer coefficient and diffusion coeffi…
Abstract A detailed study on the intercalative polymerization of aniline within different layered inorganic acid hosts (HNb 3 O 8 , HTiNbO 5 , and HSr 2 Nb 3 O 10 ) and the conformation and electrochemical properties of the resulting nanocomposites is presented. Two different mechanisms are proposed for the polymeriza…
Abstract A key problem with nanomaterials is the difficulty of controlling the dispersion of nanoparticles inside an organic medium. To overcome this problem, functionalization of the nanoparticle surface is required. Poly(methyl methacrylate) (PMMA) brushes were grown on the surface of iron oxide magnetic nanoparticl…
Orientation and size effects on phonon thermal conductivity in silicon/germanium multilayer structures,
The ability of tetraethylene glycol dimethyl ether (tetraglyme) plasma deposited coatings exhibiting ultralow fibrinogen adsorption to reduce blood activation was studied with six in vitro methods, namely fibrinogen and von Willebrand's factor adsorption, total protein adsorption, clotting time in recalcified plasma,…