Materials Literature
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Abstract The field of photocatalysis is an active area owing to the possible contributions to solve some challenging problems such as sustainable energy production, environmental pollution control, and even global warming. Unfortunately, traditional photocatalysts, especially semiconductors, suffer from inherent defic…
VO(x)/Pt(111), which was grown layer-by-layer and exhibited a well-defined structure, was used as a model catalytic surface to study the intrinsic catalytic activity of Pt, as well as the effect of VO(x) additive, for the oxidation of propane. A special sample system was designed to ensure a reliable analysis of the t…
We present a study of the growth and reactivity of ultra-thin films of TiO 2 grown on W(100). Three approaches to film growth are investigated, each resulting in films that show order in low-energy diffraction (LEED) and a low level of non-stoichiometry in X-ray photoelectron spectroscopy (XPS). H 2 O is used as a pro…
Second-phase particles are used extensively in design of polycrystalline materials to control the grain size. According to Zener’s theory, a distribution of particles creates a pinning pressure on a moving grain boundary. As a result, a limiting grain size is observed, but the effect of pinning on the detail of grain…
We have investigated hydrogenated single-wall armchair ($n$,$n$) carbon nanotubes (CNTs) with $4\ensuremath{\le}n\ensuremath{\le}12$ by using density functional theory calculations. Hydrogen adsorption may transform the CNTs into a horseshoe shape. Nonmagnetic edge-localized electron states have been identified in CNT…
ABSTRACT Blends of a commercial polypropylene (PP), typically used as food contact material, with increasing amounts of poly(4‐methyl‐1‐pentene) (PMP) are prepared in a twin‐screw extruder to obtain thin films with improved gas permeation for fresh vegetable packaging. Permeability, haze, and transparency of monolayer…
Different with vacuum powder sintering technique, the porous titanium has been sintered under positive pressure (<0.1 MPa, GP) in argon atmosphere. Using high purity titanium powder as raw material, the preparation conditions affecting porosity have been studied. The results show that pore-forming agent can be removed…
A fabrication process based on the self-assembling polystyrene spheres is proposed to obtain hole arrayed metal-insulator-metal (HA-MIM) structure for surface enhanced Raman scattering (SERS). The localized field enhancement aroused by the gap resonance in the HA-MIM structure is analyzed by finite-different time doma…
Changes induced in the molecular architecture of linear low‐density polyethylene during early stages of peroxide modification in a microcompounder are monitored by means of size exclusion chromatography and dynamic shear oscillatory measurements as a function of peroxide concentration, mixing temperature and resident…
Abstract Furan‐terminated poly(oxyethylene)‐ block ‐poly(L‐lactide) (MePEG‐PLLA‐F) and poly(oxyethylene)‐ block ‐poly(D‐lactide) (MePEG‐PDLA‐F) are synthesized by ring‐opening polymerization of L‐ and D‐lactides, respectively, in the presence of poly(ethylene glycol) monomethyl ether (MePEG) and the following terminal…
ABSTRACT In this study, the factors affecting the Young's modulus of inorganic fibrous particulate‐reinforced polymer composites were analyzed, and a new expression of the Young's modulus was derived and was based on a simplified mechanical model. This equation was used to estimate the composite Young's modulus. The e…
To improve processability, graphene was modified with Tween 80. The amount of binder required for making graphene electrodes was reduced to 4 wt% when modified with Tween 80 thus enhancing the processability for the fabrication of supercapacitors. The Tween 80 modification has considerably improved the surface area of…
A novel miniature device for rapid ultra‐sensitive surface‐enhanced Raman scattering (SERS) detection was developed in the present study. The device was made of a syringe, a piece of filter, and a Teflon tube. Therefore, it was with advantages of simplicity, miniaturization, and easy operability. The tube was filled i…
Monodispersed truncated octahedral (TOH) Au nanoparticles (NPs) with an average edge-length of about 16 nm were synthesized using poly(diallyldimethylammonium chloride) (PDDA) both as a stabilizing and reducing agent via a one-step reaction. Remarkably, no seeds, surfactants or additional reductant were used in this r…
This toxicological assessment evaluated the safety of a hydroethanolic extract prepared from Caralluma fimbriata (CFE), a dietary supplement marketed worldwide as an appetite suppressant. Studies included 2 in vitro genotoxicity assays, a repeated dose oral toxicity study, and a developmental study in rats. No evidenc…
Abstract The kinetics of 3-hexylthiophene polymerization by FeCl3 was investigated. There was observed a simple and rapid rise to a maximum polymerization rate (Rp) followed by a moderate decay to a stationary Rp. The polymerization activity increased monotonically with increasing reaction temperature to correspond to…
Polyferrocenylsilanes (PFSs) [Fe(μ-C 5 H 4 ) 2 SiRR′] n are generally atactic and amorphous when unsymmetrically substituted at silicon (R ≠ R′) but are often able to crystallize if the substitution is symmetrical (R = R′). In this paper we report detailed studies of the ring-opening polymerization (ROP) of [1]methyls…
We present further modifications to aberration-corrected environmental transmission electron microscopy (AC-ETEM) for the dynamic HRTEM observation of single atoms. Additional pumping levels that include three additional turbomolecular pumps (TMPs) enable a base pressure of 3.5 × 10(-5) Pa in the sample chamber. The e…
We report on electronic, thermoelectric, and magneto-dielectric properties of Ca1−xNaxCr2O4 series with a calcium ferrite-type structure prepared by high-pressure-high-temperature synthesis. Dielectric spectroscopy down to 2 K confirms that both CaCr2O4 and NaCr2O4 end members have an insulating ground state notwithst…
In recent years, progress in the field of hybrid materials has been accelerated through use of the sol–gel process for creating materials and devices, which benefit from the incorporation of both inorganic and organic components. In this work, organic–inorganic hybrid membranes were prepared from tetraethoxysilane and…