Materials Literature
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Nickel nanoparticles were synthesized by adding aqueous nickel salt into a microcrystalline cellulose matrix. The NiII ions were reduced with either sodium borohydride, NaBH_4, or potassium hypophosphite, KH_2PO_2, in water or aqueous NH_3 medium. The mass fraction of Ni in the samples was between 3.7 and 8.9%. X-ray…
A numerical model based on cellular automaton algorithm is developed to simulate dendrite growth at the edge of weld molten pool and the solute diffusion during grain growing process in weld solidification is analysed too. By means of two-dimensional square cells and von Neumann neighbourhood, the growing morphologies…
Homopolymerization of alkylarylcarbenes derived from diazirine monomers that featured benzyl alcohol or phenol residues was found to lead to the production of soluble hyperbranched poly(aryl ether)s. The polymerization process was influenced by the solvents employed, monomer concentration, and the reaction time. An in…
We have grown thin film libraries of the Mg-Al system using a high-throughput synthesis methodology that combines the sequential deposition of pure elements (Mg and Al) by an electron-beam (e-beam) evaporation technique and the use of a special set of moving shadow masks. This novel mask has been designed to simultane…
A variety of alternative approaches to lithography have been investigated to address the many challenges currently associated with scaling of feature sizes. One of the more cost-effective techniques has been to use the intrinsic self-assemblying properties of AB diblock copolymers to make polymer thin films as nanomet…
Our understanding of basic cell structure and function has been greatly aided by the identification of proteins at the ultrastructural level. However, the current methods for high-resolution labeling of proteins in situ, and for directly correlating observations made by light microscopy (LM) and electron microscopy (E…
Effects of electron beam oscillation techniques (sinusoidal, square, triangular, ramp, circle and elliptical) in controlling Nb segregation, Laves formation and stress rupture behaviour of Inconel 718 electron beam welds are studied. Effects of various post-weld heat treatments on stress rupture behaviour are compared…
Local cation environments in the pyrochlore dielectrics A 2 B 2 O 6 O‘ = (Bi,M) 2 (M,Nb) 2 O 6 O‘ (M = Zn, Fe) were determined from the extended X-ray absorption fine structure. The A cations and O‘ ions are displaced from their ideal positions, yielding the effective (4 + 2 + 2) coordination for the A cations. The A-…
In this work, the growth kinetics of thiol-capped PbS nanoparticles was studied. Two-stage growth process was observed, which was controlled first by oriented attachment (OA) mechanism and then by the hybrid Ostwald ripening (OR) and OA mechanism. Different from the NaOH-ZnS system, where OA will occur between any two…
Multifunctional nanoparticle probes based on semiconductor quantum dots (QDs) are developed for simultaneous targeting and imaging of cancer cells in living animals. The structural design involves encapsulating luminescent QDs with an ABC triblock copolymer, and linking this polymer to tumor-targeting ligands, such as…
The mechanism of [gamma-H2SiV2W10O40]4--catalyzed epoxidation of alkenes with hydrogen peroxide in acetonitrile/tert-butyl alcohol was investigated. The negative Hammett rho+ (-0.88) for the competitive oxidation of p-substituted styrenes and the low XSO (XSO = (nucleophilic oxidation)/(total oxidation)) value of <0.0…
Amorphous materials are prevalent in the pharmaceutical setting. Whether they are a help or hindrance, their physico-chemical characteristics must be investigated. However, the amorphous form remains a challenge to characterise with many of its properties poorly understood. In this study, gamma-crystalline and amorpho…
Polymer dispersed liquid crystals (PDLCs) are a class of electrooptic materials most often formed by polymer-induced phase separation, a one-step fabrication technique often based on photopolymerization of the commercial thiol−ene mixture NOA65. To allow further understanding regarding PDLC formation, this work system…
Lithium−sodium metazirconate solid solutions, Li 2- x Na x ZrO 3, were tested as CO 2 captors. The thermal analyses of these materials showed that all the solid solutions present similar behaviors under air and N 2 . The samples lost weight due to two different processes, desorption of physisorbed water (∼100 °C) and…
High Resolution Image Download MS PowerPoint Slide Periodic arrays of subwavelength double-hole apertures in a 100 nm gold film were used for surface-enhanced Raman scattering (SERS). The periodicity of the arrays and the double-hole overlap were varied to measure their effect on the Raman enhancement. The experiments…
Large colorless single crystals of sodium zeolite X, stoichiometry |Na80 |[Si112Al80O384]-FAU, with diameters up to 200 μm and Si/Al = 1.41 have been synthesized from gels with the composition of 2.40SiO2 : 2.00NaAlO2 : 7.52NaOH : 454H2O : 5.00TEA. One of these, a colorless octahedron about 200 μm in cross-section has…
Photophysics and photochemistry of 2-anthracenecarboxylate (AC) bound to bovine serum albumin (BSA) were investigated in detail for the first time by electronic absorption, circular dichroism (CD), steady-state and time-resolved fluorescence, fluorescence quenching, and product analysis studies. Through the spectrosco…
Reporting extensions of a recently developed approach to density functional theory with correct long-range be-havior (Phys. Rev. Lett. 94, 043002 (2005)). The central quantities are a splitting functional gamma[n] and a complementary exchange-correlation functional. We give a practical method for determining the value…
The structural, electronic and transport properties of metallocene molecules (MCp$_2$) and isolated or nanotube-encapsulated chains are studied by using a combination of density functional theory and non-equilibrium Green's functions. The analysis first discusses the whole series of isolated MCp$_2$ molecules, where M…
We have explored a synthetic route toward poly( N- isopropylacrylamide) (pNIPAm) nanogels by growing a pNIPAm shell onto a metal nanoparticle seed. Nuclei compatible with precipitation polymerization of thermoresponsive polymers were formed by adsorption of NH 2 -terminated pNIPAm on Au nanoparticles. The adsorbed pNI…