Materials Literature
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After preparing a novel amphiphilic liquid crystal hexamer possessing six cyanobiphenyl moieties and a semiperfluorinated alkyl chain, we used optical microscopy, differential scanning calorimetry, and X-ray diffraction to investigate its physical properties. The liquid crystal oligomer, 1, 10-bis{3, 4, 5-tris[6-(4′-c…
Water-in-oil (W/O) emulsion-induced micelles with narrow size distributions of approximately 140 nm were prepared by sonicating the polystyrene-b-poly(2-vinylpyridine) (PS-b-P2VP) block copolymer in the toluene/water (50:1 vol %). The ordered nanoporous block copolymer films with the hydrophilic P2VP interior and the…
Kenaf fiber (KF) based thermoplastic natural rubber (TPNR) composite was produced by melt blending with polypropylene (PP). Kenaf fiber (15% by volume) and TPNR were mixed in as Haake 600p internal mixer. The fracture behavior of the TPNR matrix and of TPNR—kenaf (with and without maleic anhydride grafted polypropylen…
The interfacial rheology of sorbitan tristearate monolayers formed at the liquid/air interface reveal a distinct nonlinear viscoelastic behavior under oscillatory shear usually observed in many 3D metastable complex fluids with large structural relaxation times. At large strain amplitudes (gamma), the storage modulus…
High-quality polarized Raman spectra have been obtained for various poly(vinylidene fluoride) (PVDF) structures, crystalline and amorphous. The results encouraged us to revisit the Raman band assignment, especially within the conformational sensitive region (400−1100 cm -1 ) and to use the new understanding to charact…
Electrical tunability of a composite consisting of small ferroelectric spheres randomly dispersed into a dielectric background is studied. A new method to calculate the effective permittivity of such a nonlinear composite is introduced. The method is based on the Bruggeman effective medium theory and a specific model…
ADVERTISEMENT RETURN TO ISSUEPREVArticlesNEXTToughening of Artificial Silk by Incorporation of Carbon NanotubesDavid Blond, Denis N. McCarthy, Werner J. Blau, and Jonathan N. Coleman*View Author Information School of Physics, Trinity College Dublin, Dublin 2, Ireland* Corresponding author. E-mail: [email protected]Cit…
Based on first-principles calculations, we propose co-doping method for increasing solubility of magnetic impurities in dilute magnetic semiconductors (DMSs). The concentration dependences of the mixing energy of DMS, such as (Ga,Mn)N, (Ga,Cr)N, (Ga,Mn)As, and (Zn,Cr)Te, show large convexity and these systems have a t…
Two amphipathic polypeptides were coordinated to the cis positions of a square planar Pt(II) complex in order to provide the metal center with two noncovalent oligomerization domains. This resulted in the formation of new metal-peptide nanoassemblies which are shown to exist as nanometer-sized spheres and fibrils. Con…
The melting kinetics of three-dimensional colloidal crystals consisting of poly( N -isopropylacrylamide) microgels was investigated by using UV−visible transmission spectroscopy. It was found that the melting was initiated with a decrease of the interplanar spacing of the crystals and that crystallites broke into smal…
Discotic liquid crystals have been attracting growing interest not only because of the fundamental importance as model systems for the study of charge and energy transport but also due to their potential application in organic electronic devices. The 1,2,3,5,6,7-hexahydroxy-9,10-anthraquinone, commonly known as rufiga…
A series of intrinsically fluorescent hydrophobic and amphiphilic polyphosphazenes with ethyl tryptophan (EtTrp) and poly(N-isopropylacrylamide) (PNIPAAm) or poly(ethylene glycol) (PEG) as hydrophobic and hydrophilic segments, respectively, are synthesized. Depending on polymer composition and preparation procedure, p…
Perovskite samples of the general formula La 0.1 A 0.9 Co y Fe 1- y O 3- δ (where A = Ca, Sr, Ba; y = 0.1, 0.5, 0.9) were synthesized in our laboratory. Further substitution of Sr to a small extent by Ag and complete substitution of La by Sr were also studied. For a fixed perovskite composition (SrCo 0.5 Fe 0.5 O 3- δ…
Ellipsometric porosimetry was used to determine the adsorption isotherms of toluene, methanol, and water on b-oriented Silicalite-1 coatings with a thickness of less than ca. 250 nm and to obtain adsorption kinetics. The adsorption isotherms are of sufficient quality to reveal several aspects of the pore structure suc…
Catalytic partial oxidation of methane (CPOM) at high-temperature, millisecond contact times ( T > 900 °C, τ = 1−50 ms) is a technologically interesting reaction pathway for the production of synthesis gas or hydrogen. While many studies on CPOM over noble metal catalysts have been published in the past 10 years, much…
Dendronized polymers containing a cellulose backbone have been synthesized with the aim of producing complex molecules with versatile functionalization possibilites and high molecular weight from biobased starting materials. The dendronized polymers were built by attaching premade acetonide-protected 2,2-bis(methylol)…
Measurements in acidic media and time-dependent density functional theory and DeltaSCF calculations were performed for Ru(bpy)2(CN)2 in 11 solvents of varying polarity to determine the solvent's influence on the absorption and emission spectra of the complex. The solvent effect caused by both the polarizable continuum…
The perchlorate complexes of manganese, nickel, and zinc with hexamethylenetetramine (HMTA) of the general formula [M(H2O-HMTA-H2O)2(H2O-ClO4)2(H2O)2] (where M=Mn, Ni, and Zn) have been prepared and characterized by X-ray crystallography. Thermal studies were undertaken using thermogravimetry (TG), differential therma…
New nanohybrids were synthesized by grafting organosilanes on silica nanoparticles. These nanohybrids containing dibipyridine, urea, and urethan functionalities can be used as new synthons for nanotechnology, catalysis, or nanocomposites. The influence of the organosilane amount was studied together with the pH and so…
We have developed a facile and direct procedure for the preparation of lanthanide chalcogenide nanocrystals (NCs) with controllable morphologies. Eu(II)S NCs were successfully obtained when protecting the reaction in inert environment, while opening the system to air resulted in lanthanide oxysulfide. Surface ligands…