Materials Literature
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Abstract We synthesize poly(oligoaniline)s consisting of multiple oligoaniline units linked by alkane spacers with their structures and properties controlled over three different oxidation states. tert‐Butoxycarbonyl (t‐BOC)‐protected diamino‐oligoanilines are synthesized and polymerized with diisocyanatoalkanes to pr…
Monodispersed ceria nanocrystals have been synthesized by an oleate-modified precipitation method combined with a hydrothermal treatment at 200°C. TEM observation indicated that ceria nanoparticles with low-crystallinity were produced by synthesis at room temperature, which were crystallized by subsequent heat treatme…
Surface treatment of water hyacinth fiber (WHF) was investigated as a mean of improving interfacial of WHF reinforced poly (lactic acid) (PLA) composites. Fiber was treated with sodium hydroxide 15% w/v at 85 °C for 3 h. The composite materials were processed using internal melt mixer and compression molding machine.…
The microwave-assisted polycondensation of maleic anhydride and 1,6-hexanediol was carried out using p-toluenesulfonic acid as catalyst. The resulting unsaturated polyester was characterized using Fourier transform infrared (FTIR) and 1H NMR spectroscopy, and the molecular weight determined using gel permeation chroma…
Abstract This paper shows how supporting the Dawson heteropoly compound (HPC) (NH4)6P2Mo18O62 opens up the possibility to enhance its catalytic activity by controlling its molecular behaviour. The effect of parameters such as the loading of the Dawson species onto a support and the nature of its interaction is explore…
Carbon nanotube (CNT) diodes with different channel length between L = 0.6 μm to 3.5 μm are fabricated on the same tube, and the electric and photovoltaic characteristics are investigated. It is found that although the open voltage of the diode increases rapidly for channel length L less than 1.0 μm, it saturates for…
In this paper, reactive ion etching of porous silicon (PS) passivated using a low-temperature anneal in N2atmosphere is studied. The average etch rates of both as-fabricated PS and passivated PS required tens of seconds to stabilize due to plasma initialization. The steady-state etch rate of our passivated PS was lowe…
Abstract In order to improve the photostability of polyoxymethylene (POM), a core‐shell acrylate elastomer with UV stabilization, i.e. poly[(methyl methacrylate)‐(butyl acrylate)‐2‐hydroxy‐4‐(3‐methacryloxy‐2‐hydroxypropoxy)benzophenone] (core‐shell poly(MMA‐BA‐BPMA)), was added into the POM matrix using a melt‐mixing…
Pyrene-fused tetraazaporphyrins were synthesized from pyrene-4,5-dicarbonitrile precursors using a recently reported procedure as the key step for the asymmetric substitution of pyrene. Metal-free, zinc- and lead-centered pyrenocyanines were obtained and their optical properties as well as their molecular assembly in…
Abstract Thermotropic main chain liquid‐crystalline poly (benzylidene‐ether)s were synthesized by Claisen‐Schmidt polycondensation reaction of 4,4′‐diformyl‐2,2′‐dimethoxy‐α,ω‐diphenoxyalkanes with acetone, cyclopentanone, and cyclohexanone. The diformyl precursors were synthesized from 4‐hydroxy‐3‐methoxybenzaldehyde…
The study aims to validate an original bio-based material, obtained by grafting fatty chains, and more especially lauric chains (C12) onto cellulose, for medical applications. The mechanical properties of the synthesized cellulose laurate (C12) are close to those of petrochemical ones such as low density polyethylene.…
CP (capsular polysaccharide) is an important virulence factor during infections by the bacterium Staphylococcus aureus. The enzyme CapF is an attractive therapeutic candidate belonging to the biosynthetic route of CP of pathogenic strains of S. aureus. In the present study, we report two independent crystal structures…
We use confocal microscopy to study the three-dimensional (3D) structure of colloidal crystals formed by poly(N-isopropylacrylamide)-co-(acrylic acid) microgels of diameter 1.0-1.5 μm. The confocal images are tracked to locate particle positions in 3D, which are used to compute pair-correlation functions g(r), bond or…
Abstract To combine temperature responsivity and degradability, novel alternating copolymers with polyester backbone and oligo(ethylene glycol) side chain were designed and prepared by alternating ring‐opening copolymerization of succinic anhydride (SA) and functional epoxide monomer(s). The epoxide monomer containing…
We present an efficient approach to study the carrier transport in graphene nanoribbon (GNR) devices using the non-equilibrium Green's function approach (NEGF) based on the Dirac equation calibrated to the tight-binding π-bond model for graphene. The approach has the advantage of the computational efficiency of the Di…
An opioid (leucine-enkephalin) conformational analogue forms diverse nanostructures such as vesicles, tubes, and organogels through self-assembly. The nanovesicles encapsulate the natural hydrophobic drug curcumin and allow the controlled release through cation-generated porogens in membrane mimetic solvent.
Abstract La0.7Sr0.3MnO3/BaTiO3 (LSMO/BTO) bilayer films were grown on (0 0 1) oriented SrTiO3 (STO), LaAlO3 (LAO) and (LaAlO3)0.3(SrAl0.5Ta0.5O3)0.7 (LSAT) substrates by pulsed laser deposition. The bilayer deposited on the LSAT substrate presented the best ferromagnetic properties due to the smallest lattice mismatch…
The microstructure and mechanical properties of ZrO2/Ni functionally graded materials (FGMs) fabricated by powder metallurgy technique were investigated experimentally. The relative density of non-graded composite and functionally graded materials (FGM) was also measured. Microscopic examination exhibits that the mate…
Titanium dioxide thin films were deposited by DC reactive magnetron sputtering on silicon wafer and glass slide at sputtering power of 210 watt under total pressure of 5.0×10-3 mbar at different oxygen partial pressure. A pure metallic titanium target was sputtered in a mixture of argon and oxygen gases. The crystal s…
In bulk single-crystal silicon, the semiconducting diamond-to-metallic \ss{}-Sn phase transformation nucleates on defects, and is manifested by a sharp uptake in light absorption at a threshold of \ensuremath{\sim}11 Gpa, accompanied with the creation of nanosized (20--50 nm) fragmentation domains. We report on the ob…