Materials Literature
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The effect of chirality on the liquid crystal organization has been systematically investigated between (S,S)- and (R,R)-isomers of a dichiral azobenzene compound. The racemic mixture was found to show the cubic phase (Im3m), indicating that the studied compound shows the cubic structure without the effect of chiralit…
Multifunctional nano-micelles formed by amphiphilic gold-polycaprolactone-methoxy poly(ethylene glycol) (Au-PCL-MPEG) nanoparticles were synthesized and evaluated for potential drug delivery applications. Amphiphilic Au-PCL-MPEG nanoparticles were synthesized by the ring-opening polymerization of epsilon-caprolactone…
Abstract Effects of filler size and content on the shrinkage of injection molded poly(butylene terephthalate)/poly(ethylene terephthalate)/talc (PBT/PET/talc) composites were investigated. Circular plate specimens were examined by a field emission scanning electron microscope and a numerical analysis code was used for…
Energy and exergy assessments are reported of integrated power generation using solid oxide fuel cells (SOFCs) with internal reforming and a gas turbine cycle. The gas turbine inlet temperature is fixed at 1573 K and the high-temperature turbine exhaust heats the natural gas and air inputs, and generates pressurized s…
Epoxy nanocomposites were fabricated using two kinds of nanofiller, amino-functionalized multi-walled carbon nanotubes (CNTs) and non-treated long carbon nanofibers (CNFs). The non-cured mixtures were analysed through viscosity measurements. The effect of the nanoreinforcement on the curing process was determined by d…
High-density horizontally aligned single-walled carbon nanotubes (SWCNTs) have been grown by annealing Fe catalyst in air and optimizing catalyst thickness in the gas flow process. The aligned SWCNT density reaches >60 nanotubes per 100 microm and the length can be a few millimeters. Interestingly, the growth of align…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTChemical Vapor Detection Using Parent Polythiophene NanofibersVineet Dua, Sumedh P. Surwade, Srikanth Ammu, Xinyu Zhang, Sujit Jain, and Sanjeev K. Manohar*View Author Information Department of Chemical Engineering, University of Ma…
By combining the results of both x-ray diffraction and neutron total-scattering experiments, we show that $\text{Ni}{(\text{CN})}_{2}$ exhibits long-range structural order only in two dimensions, with no true periodicity perpendicular to its gridlike layers. Reverse Monte Carlo analysis gives an experimental distincti…
The application of enantioseparation methods alone can only yield up to 50% of the desired chiral product. Thus enantioseparation becomes more attractive when accompanied by the racemization of the counter-enantiomer. Here we present first results of dynamic kinetic resolution of L-asparagine (L-Asn) via preferential…
Abstract The objective of this research was to evaluate the effect of kenaf fiber orientation and furnish formulation on the properties of laminated natural fiber–polymer composites (LNPC). The uniaxial fiber orientation provided property enhancement of the LNPC. The randomly oriented kenaf fibers, regardless of fiber…
Abstract Star‐like polyurethane (PU) hybrid films containing octafunctional cubic silsesquioxanes are prepared by polyaddition reaction between octakis(dimethylsilyloxy) silsesquioxane isopropenyldimethylbenzyl isocyanate (OS‐PDBI) and octakis(dimethylsilyloxy) hydroxypropyl silsesquioxane (HPS); and between OS‐PDBI a…
The reported fluorescence from inner shells of double-walled carbon nanotubes (DWCNTs) is an intriguing and potentially useful property. A combination of bulk and single-molecule methods was used to study the spectroscopy, chemical quenching, mechanical rigidity, abundance, density, and TEM images of the near-IR emitt…
Three amines with different molecular structure, triethylenetetramine (TETA) and two polyetheramines (Jeffamine D-230 and Jeffamine T-403) were employed to functionalize multi-walled carbon nanotubes (MWCNT) previously oxidized by acid treatment. The functionalized MWCNT were characterized by Fourier transform infrare…
Abstract Bimodal polyethylenes comprising varying proportions of high‐ and low‐molecular‐weight fractions are synthesized in a single polymerization stage, via the co‐immobilization of a chromium and an iron catalyst on an MgCl 2 /AlEt n (OEt) 3− n support. Changes observed in the viscoelastic response of the polymer…
Heterometallic lead-manganese beta-diketonates have been isolated in pure form by several synthetic methods that include solid-state and solution techniques. Two compounds with different Pb/Mn ratios, PbMn(2)(hfac)(6) (1) and PbMn(hfac)(4) (2) (hfac = hexafluoroacetylacetonate), can be obtained in quantitative yield b…
Silicon nanocrystals were synthesized by CO(2) laser pyrolysis of SiH(4). The fresh silicon nanopowder was oxidized in water to obtain SiO(2) nanoparticles (NPs) exhibiting strong red-orange photoluminescence. Samples of SiO(2) NPs embedded in low concentration in a thin polymer layer were prepared by spin-coating a d…
A technique to prepare well-equilibrated polymer melts is presented. The method, named fine-graining, consists of two steps: the generation of continuum random walks characterized by different Kuhn lengths and the insertion of the atomistic units on the "parent" random walk chains. The procedure ensures a good equilib…
Abstract NMR and dielectric studies were carried out for ferroelectric NaNO 2 embedded into porous alumina. 23 Na spin‐lattice relaxation and static lineshape were measured within a large temperature range covering the ferroelectric phase transition in bulk sodium nitrite till NaNO 2 melting. The coexistence of the cr…
The aggregation behavior of the zinc porphyrin-beta-CD conjugate in a water/ethanol binary mixed solution was investigated. The spectroscopic data and the atomic force microscopy (AFM) image strongly suggest that a part of a Zn porphyrin is included in the beta-CD nanocavity of another ZnP-beta-CD conjugate at certain…
The crystallization of a SiO 2 –Al 2 O 3 –CaO–MgO–(R 2 O) glass in the presence of Cr 2 O 3 , Fe 2 O 3 , and TiO 2 nucleants was investigated utilizing differential thermal analyses, X‐ray diffraction, and scanning electron microscope. The optimum nucleation and growth rates of aluminian diopside crystals was determin…