Materials Literature
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We demonstrate the concept of a merged nanoscale photonic crystal slot waveguide that acts as a bandpass filter in the near infrared region of the spectrum. The device is based on the integration of a photonic crystal cavity in a slot waveguide on a silicon on insulator substrate. The device is further embedded in amo…
Compared to grinding which has low efficiency, serious pollution, and hard turning together with serious tool wear, whirlwind milling (WM) is a more competitive machining process in manufacturing. However, as a technology under development, the complicated mechanism in WM processes has not yet been fully understood. I…
We have studied the self-assembly of a series of multicomponent cyclic supramolecular polygons on a Au(111) surface using scanning tunneling microscopy and kinetic Monte Carlo simulations. Our results indicate that while closed polygons or cages efficiently self-assemble in three dimensions at appropriate temperatures…
Abstract Quaternary kesterite‐type Cu2ZnSnS4 (CZTS) nanoparticles (NPs) were successfully synthesized by a single‐step solvothermal process. Semiconductor CZTS nanoparticles were obtained from ethylene glycol (EG) and CZTS precursor after solvothermal process at 180 °C for 30 h in polyvinylpyrrolidone (PVP) medium. Th…
Spin and charge transport: The electronic and structural properties obtained from KC60(THF)5⋅2 THF single crystals are reported (see picture). An important finding is the presence of one-dimensional electric conductivity and the observation of counterintuitive anisotropy for electron transport.
We develop a general method for calculating conduction-diffusion transport properties of strong electrolyte mixtures, including specific conductivities, steady-state electrophoretic mobilities, and self-diffusion coefficients. The ions are described as charged Brownian spheres, and the solvent-mediated hydrodynamic in…
The microstructure of rolling element bearings can experience significant transformation when subjected to repetitive contact cycling. In Part 1 of this article, a detailed overview of the known microstructure alteration phenomena was presented and the different mechanisms for describing them proposed by various inves…
Solvent crystallization is the main method used for preparing anthracene and carbazole from the crude anthracene. The key to the optimization of this method is improving the solubility selectivity of the solvent by means of solvent modulating and process optimization. In this study, the solubility of anthracene, phena…
In this paper, a procedure for fabricating and testing a seamless spherical dielectric elastomer actuator (DEA) is presented. In previously developed spherical prototypes, the DEA material is pre-strained by a rigid frame to improve the actuator's output force; however, it is possible to pre-strain a spherical DEA by…
Riboswitches are RNA elements that allosterically regulate gene expression by binding cellular metabolites. The SAM-III riboswitch, one of several classes that binds S-adenosylmethionine (SAM), represses translation upon binding SAM (OFF state) by encrypting the ribosome binding sequence. We have carried out simulatio…
Traditionally, magneto-dielectric effects have been developed by combining ferroelectric and magnetic materials. Here, we show a magneto-dielectric effect from optically-generated intermolecular charge-transfer states in an organic semiconducting donor:acceptor (PVK:TCNB) system. We observe in magnetic field effects o…
Epoxy resin/ceramic barium titanate nano-and micro-composites were prepared and studied.Investigation of morphological characteristics was conducted by means of x-ray diffraction spectra and scanning electron microscopy images, while the dielectric response of the composite systems was examined via broadband dielectri…
The present study was conducted at the Composting Unit, Universiti Putra Malaysia to determine the physico-chemical changes, microbial dynamics, and enzyme activities during microbial composting of rice straw at different pH conditions. Different treatments comprising of composting substrates (A), substrates with micr…
This paper describes the surface modification of TiO2 with 3-aminopropyltriethoxysilane (APTES) followed by covalent attachment of Ru-based N719 dye molecules to TiO2 through an amide linkage for use as photoanodes (PAs) in dye-sensitized solar cells (DSSCs). Attenuated total reflectance-Fourier transform infrared spe…
Abstract Crystals of two new hexammoniates, namely, [Ga(NH3)6]I3·NH3 and [Ga(NH3)6]Br3·NH3, were grown from liquid ammonia solutions of GaI3 and GaBr3 in a wide temperature range. The known compound [Ga(NH3)5Cl]Cl2 and the new triammoniate of gallium fluoride Ga(NH3)3F3 were obtained ammonothermally during the synthes…
This paper reports the coupling of operando infrared (IR) and steady-state isotopic transient kinetic analysis (SSITKA) for air purification studies from volatile organic campounds (VOCs) by photocatalysis. Methanol photo-oxidation has been used as a model reaction. A new photocatalyst (TiO 2 -L) has been studied and…
The red pigment α-HgS tends to blacken in the presence of light and chloride ions. Hypotheses exist for the decomposition and discoloration, including formation of β-HgS (black) or of metallic mercury, but these have not been detected on naturally or synthetically degraded HgS paint. Electrochemical experiments now de…
The photocatalytic activity in aqueous solutions of TiO2 and Ag enhanced TiO2 sol-gel produced films was characterized using tris(hydroxymethyl)aminomethane (Tris) under black light (365 nm) and the observed differences in efficiency were further investigated by O2 adsorption studies using the same probe. Hydrogen abs…
Fractal TiO 2 nanostructures in crystalline form are obtained at ambient pressure and temperature by pulsed laser deposition with femtosecond pulses. The synthesized structures have been studied by scanning electron microscopy, Raman spectroscopy, and X-ray photoemission spectroscopy. We show that the dendritic aggreg…
Two anionic iridium complexes [(R-ppy)2Ir(O^N)]TBA with R-ppy = 2-phenylpyridine or 4,5'-dimethyl-2-phenylpyridine, O^N = dianionic form of orotic acid and TBA = tetrabutylammonium have been synthesised and fully characterised by UV-Vis, emission, IR, NMR and cyclic voltammetric studies. These cyclometallated luminesc…