Materials Literature
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Surface-modified mesoporous silicas (MSs) were investigated for recyclable adsorption of an endocrine disrupter, bisphenol A (BPA). Surface-modified MSs were prepared by (i) post-synthesis surface modification of MSs using surface hydroxyl groups and organosilanes (m-MS) and by (ii) co-condensation of tetraethoxysilan…
The graft copolymerization of acrylic acid (AA) onto styrene butadiene rubber (SBR) was carried out in toluene at 80°C using benzoyl peroxide (BPO) as initiator. The synthesized styrene butadiene rubber-g-acrylic acid (SBR-g-AA) was characterized with Raman IR spectroscopy. A study was conducted on the use of SBR-g-AA…
GCMC simulations are applied to the adsorption of sub-critical ammonia on graphitized carbon black at 240 K. The carbon black was modelled both with and without carbonyl functional groups. Large differences are seen between the amount adsorbed for different carbonyl configurations at low pressure (P < 10 kPa). Once a…
The electron structure of undoped LaMnO3 and slightly doped La1−x SrxMnO3 manganites has been calculated within the framework of a generalized tight binding method with explicit allowance for strong intraatomic electron correlations. According to the results of these calculations, the ground state in orbitally disorde…
Abstract We have investigated a new design for a turning film used in combination with wedge‐shaped light guide plates. The selected design has a top periodic lenticular structure that is in registration with the bottom periodic prisms. Relative registration shift in the prisms and the top lenticular structure was fou…
Frustrated Smectic Phase Appearing as Transitional State between Single-Layer and Antiferroelectric Bilayer Smectic Phases in Binary Mixtures of Dimeric Compounds, Izumi, Tatsuya, Naitou, Yuu, Tokita, Masatoshi, Watanabe, Junji
Highly concentrated suspensions of ultrafine alumina powders are prepared using 2‐phosphonobutane‐1,2,4‐tricarboxylic acid as dispersant. The coagulation of these suspensions is carried out at around 278 K by adding a blend of acetic anhydride plus ethylene glycol. Coagulation takes place through a pH shift because of…
Nano-Ti particles with grain sizes of 56 nm ~ 128 nm were modified by inoculating an organic amine Junctional group onto their surface using a two-step process. These modified nano-Ti particles were dispersed into the bisphenol A-type epoxy resin and then cured with polyamide to form a coating on the metal substrates.…
Este trabalho teve como objetivo determinar as propriedades de painéis fabricados com mistura de partículas de madeira de Eucalyptus grandis, polietileno de alta densidade, polietileno de baixa densidade e polipropileno. Empregaram-se duas formulações adesivas (uréia-formaldeído e uréia-formaldeído contendo 0,5% de ep…
The study evaluates the possibility of enhancing uptake of etoposide (topoisomerase II inhibitor) by tumor when delivered through polysorbate 20 micelles. The micelle formation was ascertained by determining the critical micellar concentration (CMC) with a du Nouy ring tensiometer and by size measurement using dynamic…
The nature of source/drain contacts in graphene field-effect transistors (GFETs) is investigated. We argue that the energy dispersion of the graphene portion underneath of the metal electrodes is substantially altered compared to its original. Moreover, different from other materials, the Fermi levels of these graphen…
The fusion method was used to produce PbS quantum dots (QDs) embedded in S-doped glass matrix (SiO2-Na2CO3-Al2O3-PbO2-B2O3:S). Measurements of optical absorption (OA), photoluminescence (PL) and atomic force microscopy (AFM) have been carried out in order to characterize the produced QDs. A strong red-shift observed i…
George Marsh visited GKN Aerospace's composites centre on the Isle of Wight, UK.
The influence of β crystalline form nucleating agent (β nucleator) on the mechanical properties of homo-polymerized polypropylene (PPH), random-copolymerized polypropylene (PPR), block-copolymerized polypropylene (PPB), and PPH/PPR/PPB blends was studied. Polarized optical microscopy (POM), differential scanning calor…
A hybrid solution‐coated powder method was used to reduce the sintering temperature of TiO 2 ‐modified Ta 2 O 5 ceramics. This simple and effective method allowed chemical homogenization and densification to take place below a densification‐impeding phase transformation, something that has not been achieved by traditi…
Iron and aluminum oxides are widespread in tropical environments and increase soil's isoelectric point (IP). Anion adsorption modifies the IP and the surface charge of oxidic materials. This study evaluated IP changes on A‐ and B‐horizon samples of two Brazilian Oxisols upon reaction with acetate, citrate, oxalate, ph…
Spontaneous polarization P s (T) was measured as a function of temperature in the Sn2P2 S 6 single crystals. The coefficients α, β and γ of the thermodynamic potential were determined. The order parameter critical index β′ is 0.297. Discontinuity of the heat capacity ΔC p and pressure dependence of the quantity ΔC p (…
The temperature dependence of pyroelectric and dielectric properties was measured for polycrystalline Pb[(Fe 1/3 Sb 2/3 ) x Ti y Zr z ]O 3 where x = 0.1, y = 0.4–0.5 and x + y + z = 1 in the temperature range from 300 K to 650 K. The total pyroelectric effect was determined by measuring the pyroelectric current. The c…
Abstract Low alloyed zirconium sheets (Zr702) have been cold-rolled up to 80% thickness reduction and submitted to various isothermal treatments. The aim was to identify the mechanisms which produce microstructure and texture changes during recrystallization and grain growth. XRD and texture analysis, FEG–SEM with EBS…
The coupled-wave method (CWM) has been used for transmission analysis of binary metallic gratings with narrow slots. It is proved that waveguide properties of slot determine the transmission in such gratings. For TE waves at given wavelength a minimum width of slot exists, when a considerable transmission can be achie…