Materials Literature
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The combined effects of alkali and ultrasound treatment of wood flour on the mechanical properties of polypropylene-based wood/plastic composites (WPCs) were examined. FT-IR measurements confirmed that the alkali treatment removed both hemicellulose and lignin from the wood, and there was an increase in the number of…
Surface enhanced Raman scattering (SERS) has been used to detect specific pterin molecules at sub-nanomolar concentrations. SERS is fast becoming a widely used technique for the sensitive and specific detection of multiple analytes. The information-rich and concentration-dependent spectra obtained from SERS make the t…
We develop a mesoscopic density functional theory (DFT)-based Monte-Carlo approach for studying the phase behaviour of multi-component systems comprised of irreversibly bonded, conventional macromolecules and supramolecular entities. The latter can reversibly associate with each other and the conventional components t…
Serat sisal merupakan penguat yang menjanjikan untuk digunakan sebagai komposit karena harganya yang murah, densitasnya yang rendah, kekuatan spesifik dan modulusnya yang tinggi, tanpa resiko kesehatan serta tersedia melimpah dan merupakan bahan alam terbarukan. Pengambilan serat sisal dapat dilakukan dengan pembusuka…
A-site-doped lanthanum ferrite perovskites are considered to be promising cathode materials for the lower temperature operation of solid oxide fuel cells due to their high catalytic activity, mixed electronic and ionic conductivities at reduced temperature, and adjustable thermal-expansion coefficient. The defect chem…
Using an approximate time-dependent density functional theory method, we calculate the absorption and luminescence spectra for hydrogen passivated silicon nanoscale structures with large aspect ratio. The effect of electron confinement in axial and radial directions is systematically investigated. Excited state relaxa…
The electronic properties of multiferroic BiFeO3 with paraelectric paramagnetic phase at high-temperature and ferroelectric antiferromagnetic phase are calculated using density functional theory with spin-polarized generalized-gradient approximation (GGS) and plane wave pseudopotentials. study of Born effective charge…
The mechanical properties of Q235 steel after high temperature treatment were discussed. The hot treating temperature is 200 ℃, 400 ℃, 600 ℃, and 800 ℃, respectively. The experimental specimens were cooled in two different cooling modes, which are natural cooling mode and swamp cooling mode. After cooled, the surface…
Optothermal conversion mediated by gold nanoparticles was exploited to generate localized Au/TiO2 inverse opal structures in direct opal substrates. The local enhancement of the electromagnetic field made these nanostructures active sites for SERS and contributed to boosting the efficiency of some reactions, such as t…
Phenol‐based novolac resins were synthesized with different mole ratios of phenol‐to‐formaldehyde. These novolac resins were epoxidized with molar excess of epichlorohydrin at 120 °C in basic medium. Novolac and epoxy novolac resin were characterized by FTIR, NMR and GPC analysis. Molecular weight was found to be 838.…
The case where the background material of a cloak possesses magnetoelectric coupling is investigated in this paper, for examples, the base medium is bianisotropic or an isotropic medium moving with uniform speed which may be comparable with that of light.The specifically proposed constitutive parameters for such kind…
An analytic theory for the electromagnetic scattering from a coated perfect electromagnetic conductor (PEMC) sphere is developed. The sphere is characterized by its M parameter, and the coating material by its permittivity and permeability, which may attain arbitrary values, including negative ones. The theory is appl…
The curing kinetics of neat epoxy (NE) and hemp fibre/epoxy composites was studied and assessed using two dynamic models (the Kissinger and Flynn–Wall–Ozawa Models) and an isothermal model (the Autocatalytic Model) which was generally supported by the experimental data obtained from dynamic and isothermal differential…
The photoluminescence (PL) of riboflavin-methyl cellulose hydrogel is 93 fold enhanced in the gel state compared to that in the sol state at pH ≤7. AND molecular logic gate like behaviour is observed using temperature and pH as inputs and enhanced PL of riboflavin as the output. Thermal gelation of methyl cellulose at…
Spin triads of copper(ii) with two nitroxides are responsible for the magnetic anomalies in a new family of molecular-magnetic compounds called "breathing crystals". We have shown previously that electron paramagnetic resonance (EPR) spectroscopy allows one to investigate the peculiarities of these systems and obtain…
We introduce a compact model for the temperature distribution in cylindrical nanowire (NW) phase-change memory (PCM) cells for both transient (nanoseconds) and steady-state time scales. The model takes advantage of the symmetry of the cell to efficiently calculate temperature distribution dependence on geometry and ma…
The gelation and conductivity behaviour of gellan gum–carbon nanotube composite materials was investigated. It was shown that addition of carbon nanotubes allowed for more efficient cooling and heating of composite dispersions compared to gellan gum solutions. Free-standing films were prepared by an evaporative castin…
We present a series of experimental results indicating improved oxygen reduction characteristics on nanocrystalline yttria-stabilized zirconia (YSZ) surfaces. We compare ( i ) cathodic interface impedances on nanocrystalline and microcrystalline YSZ, ( ii ) oxygen exchange rate on and bulk diffusivity in nano- and sin…
To systematically study the effect of surface composition on the catalytic activity for oxygen exchange, (LSM) powder was infiltrated with various metal nitrate solutions (La, Sr, Co, Fe) and then calcined to deposit the resultant metal oxide on the surface of the powder. The elements chosen for LSM infiltration were…
Abstract Superhydrophobicity is dependent on both the surface energy and the texture of the surface. These factors are discussed in terms of a series of electrospun poly(methyl methacrylate)-graft-poly(dimethylsiloxane) (PMMA- g -PDMS) copolymers with different poly(dimethylsiloxane) (PDMS) content. These copolymers a…