Dense fine-grained aggregates prepared by spark plasma sintering (SPS), an original technique in experimental petrology
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Near‐infrared laser delivery of nanoparticles to developing embryos: A study of efficacy and viability
Targeted delivery of materials to individual cells remains a challenge in nanoscience and nanomedicine. Near infrared (NIR) laser injection may be a promising alternative to manual injection (where the micropipet diameter limits targeting to small cells) or other laser techniques (such as picosecond green and UV laser…
Electrospinning of poly(hydroxybutyrate‐ co ‐hydroxyvalerate) fibrous tissue engineering scaffolds in two different electric fields
Abstract Poly(hydroxybutyrate‐ co ‐hydroxyvalerate) (PHBV) was electrospun into ultrafine fibrous nonwoven mats. Different from the conventional electrospinning process, which involves a positively charged conductive needle and a grounded fiber collector (i.e., positive voltage (PV) electrospinning), pseudo‐negative v…
Optical Enhancement and Structural Properties of a Hybrid Organic−Inorganic Ternary Nanocomposite
The assembly among gold nanoparticles, the water-soluble tetrakis(4-sulfonatophenyl)porphyrin and spermine, in acidic solution, forms a hybrid nanocomposite exhibiting scattering enhancement. A scaling law of a cluster−cluster aggregate of metal nanoparticle composites, with 0.3 as optical spectral dimension, is obser…
Accurate freezing and melting equations for the Lennard-Jones system
Analyzing three approximate methods to locate liquid-solid coexistence in simple systems, an observation is made that all of them predict the same functional dependence of the temperature on density at freezing and melting of the conventional Lennard-Jones system. The emerging equations can be written as $T={\mathcal…
Multiferroic response to magnetic field in orthorhombic manganites
The magnetoelectric coupling in Eu0.55Y0.45MnO3 is studied based on a microscopic spin model which includes the superexchange interaction, the single-ion anisotropy, the Dzyaloshinskii–Moriya interaction, and the cubic anisotropy. Our Monte Carlo simulation reproduces the experimentally observed multiferroic response…
The nanostructure and dewetting of block copolymer thin films annealed in different neutral solvents
Abstract The morphology of polystyrene‐ b ‐poly(2‐vinyl pyridine) thin films annealed under various neutral solvents was investigated. The morphological transition depends on the vapor pressure of the solvent, the quantity of the solvent in the film, and annealing time. We introduced the volume fraction of solvent in…
Silica Obtained Via Pyrolysis of Waste ‘Green’ Tyres - A Filler for Tyre Tread Rubber Blends
A solid product SiO 2 D has been obtained as a result of subjecting the tread of ‘green’ tyres to pyrolysis-cum-water vapor. It has been found by IR-FTIR and EDXRF spectroscopy that the product contains 65% of SiO 2 , 30% of carbon, 3% of ZnO, and 2% of other components. The mechanical and dynamic properties, and SEM…
Behaviour of electrical conductivity in CsI–Al2O3 and CsI–TiO2 systems
This paper reports the effect of heterogeneously doped alumina and titania on the ionic conductivity of CsI. Composite materials (1 − x)CsI–xAl2O3 and (1 − x)CsI–xTiO2, x = 0–0.7 have been prepared and studied by X-ray diffraction (XRD), differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and i…
Nonisothermal melt‐crystallization behavior of calcium phosphate/poly(3‐hydroxybutyrate‐co‐3‐hydroxyvalerate) nanocomposite microspheres
Abstract Microspheres consisting of poly(3‐hydroxybutyrate‐co‐3‐hydroxyvalerate) (PHBV) polymer matrix and calcium phosphate (Ca‐P) nanoparticles were made using the solid‐in‐oil‐in‐water (S/O/W) emulsion solvent evaporation technique. Amorphous Ca‐P nanoparticles with the calcium to phosphate ratio of 1.5 were relati…
Synthesis and characterization of styrenated rubber seed oil alkyd
Rubber seed oil alkyd was post-polymerized with styrene monomer at ratios of 1:2, 1:4, 1:6, 1:8, and 1:10 at 100°C for 3 h (samples i - v) and 6 h (samples A - B), to obtain two sets of styrenated alkyds. The styrenated alkyds and the rubber seed oil alkyd were all characterized and evaluated by standard methods, for…
Biexcitons in semiconducting single-walled carbon nanotubes
We study numerically the nature of biexcitons in semiconducting single-walled carbon nanotubes by exactly solving the two-electron-two-hole problem in the realistic Hamiltonian derived using the $\mathbit{k}\ifmmode\cdot\else\textperiodcentered\fi{}\mathbit{p}$ and screened Hartree-Fock approximation. Our treatment ca…
CuO-Nanowire Field Emitter Prepared on Glass Substrate
This study reports the growth of CuO nanowires (NWs) on glass substrate, and the fabrication of CuO-NW field emitter. Using CuO as the adhesion layer, we successfully grew CuO NWs of 2.5 μ m average length and 70 nm average diameter by thermal annealing at 450 °C for 5 h in air. It was found that turn-ON field of the…
Defects in low-k organosilicate glass and their response to processing as measured with electron-spin resonance
Defect concentrations in low-k organosilicate glass films deposited on high-resistivity silicon were measured with electron-spin resonance. Bulk dangling bonds were detected. Both plasma exposure and ultraviolet exposure were used. During argon electron cyclotron resonance plasma exposure, ion and photon bombardment i…
Evidence of Multiwall Carbon Nanotube Deformation Caused by Poly(3-hexylthiophene) Adhesion
We show that when a soft polymer like poly(3-hexyl-thiophene) wraps multiwall nanotubes by coiling around the main axis, a localized deformation of the nanotube structure is observed. High resolution transmission electron microscopy shows that radial compressions of about 4% can take place, and could possibly lead to…
Natural Rubber Nanocomposites by In Situ Modification of Clay
Abstract The fabrication of nanocomposites by organic modification of clay during mixing into NR is reported. NR/OMMT nanocomposites show more intercalation and exfoliation at higher modifier content, increasing the tensile modulus primarily by improved filler reinforcement. Comparison with nominally identical pre‐mod…
Analysis of interband, intraband, and plasmon polariton transitions in silver nanoparticle films via in situ real-time spectroscopic ellipsometry
The dielectric function of Ag nanoparticle films, deduced from an analysis of in situ real-time spectroscopic ellipsometry (RTSE) measurements, is found to evolve with time during deposition in close consistency with the film structure, deduced in the same RTSE analysis. In the nucleation regime, the intraband dielect…
Analytic Combustion
Combustion involves change in the chemical state of a substance from a fuel-state to a product-state via chemical reaction accompanied by release of heat energy. Design or performance evaluation of equipment also requires knowledge of the rate of change of state. This rate is governed by the laws of thermodynamics and…
Unprecedented Alkylzinc–Magnesium Alkoxide Clusters as Suitable Organometallic Precursors for Magnesium‐Containing ZnO Nanoparticles
The synthesis and characterization of the first heterobimetallic methylzinc-magnesium alkoxide clusters [Me(6)MgZn(6)(OR)(8)] [R=Et (1 a), n-Pr (1 b), nBu (1 c)] with a bis-cubane-shaped MgZn(6)O(8) core is described. The thermal degradation of 1 a-c and mixtures of 1 a and the homometallic MeZn-alkoxide cubane [{MeZn…
Cocrystallization of ethylene/1‐octene copolymer blends during crystallization analysis fractionation and crystallization elution fractionation
Abstract Blending of ethylene/1‐octene copolymers can be used to achieve a well‐controlled broad chemical composition distribution (CCD) required in several polyolefin applications. The CCD of copolymer blends can be estimated using crystallization analysis fractionation (CRYSTAF) or crystallization elution fractionat…