Materials Literature
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Benefiting from excitonic charge-transfer states, an efficient non-linear optical response is observed in type-II nanocrystals by four-wave mixing when the incident photon energy lies below the bandgaps of constituent semiconductors. The non-linear optical properties in nanocrystals can be manipulated by the band alig…
Abstract A simple, versatile, rapid, and inexpensive procedure based on the immersion method is developed to fabricate chemical gradients on chemically activated Si/SiO 2 surfaces by a trichloro (1H,1H,2H,2H‐perfluorooctyl) silane self‐assembly monolayer (SAM). Contact angle measurements, atomic force microscopy, and…
In this work, we investigated the effect of topological structures of block copolymers on the formation of the nanophase in epoxy thermosets containing amphiphilic block copolymers. Two block copolymers composed of poly(ε-caprolactone) (PCL) and poly(2,2,2-trifluoroethyl acrylate) (PTFEA) blocks were synthesized to po…
ABSTRACT To obtain homogeneous dispersion and good interfacial interaction between MWCNT and polymer matrix, the functionalization of MWCNTs with 3,5‐diaminobenzoic acid (DAB) via a direct Friedel‐Crafts acylation was accomplished. FTIR, XPS, and FT‐Raman analysis was performed to confirm that diaminobenzoyl moieties…
A continuous section of hydromorphic to well‐drained podzols in a Late Pleistocene marine terrace of southeastern Brazil offers a unique opportunity for a detailed interpretation of podzol morphology. The soils show very deep and homogeneously colored B horizons in the most hydromorphic members, where the predominant…
Aqueous foams of oleic acid/oleate solution were found to be pH-responsive with pH changes. Detailed characterization of the aqueous foams of oleic acid/oleate solution was conducted with respect to their stability, structure, and pH response. The pH values required for foam circulation were studied through pH adjustm…
Bilayer graphene has attracted a great deal of attention for many electronic and optical applications. Although large-area bilayer graphene can be synthesized by chemical vapor deposition (CVD), multilayer growth often occurs and subsequent processes are required to obtain uniform bilayer films. We report an efficient…
Conformations of a single-component bottle-brush polymer with a fully flexible backbone under poor solvent conditions are studied by molecular dynamics simulations, using a coarse-grained bead-spring model with side chains of up to N = 40 effective monomers. By variation of the solvent quality and the grafting density…
ABSTRACT Synthesized polylactides (PLA) with different D ‐isomer contents in the polymer chain were melt‐blended with a series of “green” plasticizers by extrusion. Mechanical and thermal properties as well as the morphology of the plasticized materials were characterized to demonstrate how the combination of PLA with…
Multiobjective optimization using a Reduced Space Searching Algorithm (RSSA) is employed to optimally design titanium alloys suitable for prosthetic applications, i.e., with high strength, low elastic modulus, adequate biocompatibility, and low costs. The objectives in question are conflicting in nature, and thus mult…
Fast responsive photochromic materials are obtained by encapsulation of the photoactive molecules within liquid-filled capsules. By properly selecting the nature of the liquid core, solid stable materials are prepared with solution-like color-changing rates that are at least tenfold faster than those measured for rigi…
The effect of (Sc,Ta) doping on the properties of Bi 3 TiNbO 9 -based ceramics was investigated. The (Sc,Ta) modification greatly improves the piezoelectric activity of Bi 3 TiNbO 9 -based ceramics and significantly decreases the dielectric dissipation. The d 33 of Bi 3 (Ti 0.96 Sc 0.02 Ta 0.02 )NbO 9 was found to be…
This paper describes the results obtained on the preparation of films composed of linter cellulose and the corresponding acetates. The acetylation was carried out in the LiCl/DMAc solvent system. Films were prepared from a LiCl/DMAc solution of cellulose acetates (degree of substitution, DS 0.8-2.9) mixed with linter…
Abstract The interaction of widespread monoterpenes limonene, α‐pinene, and β‐pinene with crotonaldehyde using silica‐supported tungstophosphoric heteropoly acid H 3 PW 12 O 40 and its acidic cesium salt Cs 2.5 H 0.5 PW 12 O 40 as solid acid catalysts in dichloroethane solutions results in cycloaddition, which gives t…
Biocomposites: Influence of Matrix Nature and Additives on the Properties and Biodegradation Behaviour
We present a detailed theoretical and experimental study of the reflectance response of a deformed-helix ferroelectric (DHF) liquid crystal (LC) cell to an applied voltage under cross-polarisers. Using a model based on the effective dielectric tensor approximation, we derive simple analytical formulas to design a LC c…
Although the corrosion performance of spinel‐containing castables has been extensively investigated in recent years, no previous studies accessed the different conditions present in the ladle bottom. In this region, strong variations in the atmospheric environment are often detected, which could drastically change the…
A series of 4-bromonaphthalimide systems (BNI-C n; n = 4, 6, 10, 12, and 16) comprising different alkyl side chains have been synthesized and used as the building blocks to fabricate organic fluorescent micro materials. The systems have been developed basically to investigate the effect of alkyl side chains on the agg…
Transport measurements were performed on the organic layered compound $\ensuremath{\alpha}\ensuremath{-}{(\mathrm{BEDT}\ensuremath{-}\mathrm{TTF})}_{2}{\mathrm{I}}_{3}$ under hydrostatic pressure. The carrier types, densities, and mobilities are determined from the magnetoconductance of $\ensuremath{\alpha}\ensuremath…
A new approach is presented to produce amorphous porous silicon coatings (a-pSi) with closed porosity by magnetron sputtering of a silicon target. It is shown how the use of He as the process gas at moderated power (50-150 W RF) promotes the formation of closed nanometric pores during the growth of the silicon films.…