Materials Literature
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The aim of this study was to investigate the usefulness of automated sorption isotherm methods for determining the glassy to rubbery transition in a model amorphous food material, polydextrose. The automated sorption isotherms were obtained from 20 to 40??C at 5??C intervals using dynamic vapor sorption (DVS). The DVS…
Abstract The platinum(II) salt Pt(H2O)4(SbF6)2 is a stable compound. In the solid state the compound consists of isolated Pt(H2O)42+ cations and SbF6– anions. Space group P$\rm P\bar1$ , Z = 1, lattice dimensions at 133 K: a = 503.7(2), b = 783.4(2), c = 854.1(2) pm, α = 69.03(2), β = 83.36(2), γ = 75.88(2).
The molecular orientation of a nematic sample limited by two concentric cylinders is theoretically investigated. The surfaces are assumed as having an inhomogeneous distribution of easy directions. The results are found in the one-constant approximation, in the presence of an external electric field, for weak anchorin…
The square gradient free energy functional is used to describe the distribution of sub-critical crystalline fluctuations in a supercooled liquid. We show that for any supercooling there exists a cluster radius of 3-4 particle diameters below which the crystalline order is no longer stable. We explore the consequences…
최근 안의료용 소재는 광학적 특성, 물리․화학적 안정성, 생체적합성과 같은 기본적인 특성뿐만 아니라 고 산소투과 성, 항균성, 자외선 차단성 등의 기능성을 갖춘 고분자 재료 의 연구가 다양하게 진행되고 있다
[M(L/L') $(NO_3)_n$ ]. $mH_2O$ 및 [VO(L/L')( $SO_4)$ ]. $2H_2O$ (여기서 L/L'는 Schiff 염기로 thiocarbohydrazide (TCH), benzilmonohydrazone (BMH)/diacetylmonohydrazone (DMH) 및 carbon disulphide에서 유도된 "3,4,10,11-tetraphenyl/tetramethyl-1,2,5,6,8,9,12,13-octaazacyclotetradeca-2,4,9,11-tetraene-7,14-dithione")의 분자식을 갖는 일련의 거대고리 착…
A variety of artificial fibers extensively employed as lining in high-temperature apparatus may undergo a devitrification process that leads to significant changes in the chemical-physical properties of the materials. Among them, the crystallization of carcinogenic minerals, such as cristobalite, has already been docu…
Mechanical damage to bulk polymers typically begins as a microcrack, which can lead to eventual failure of the material if there is no method to inhibit crack growth. In living systems, this damage automatically initiates a healing response. Following the example of nature, self-healing polymers are engineered with th…
In this study, some novel thiosubstituted butenyne (3a-d, 7b, 15b), butadiene (4a-b, 4d, 5a, 5c, 6b, 8e, 9c, 10b, 16b, 18e) and [3]cumulene (11a-b with isomer 3a-b, 12a with isomer 13a, 14b, 17e) compounds were synthesized from the reaction of 2H-pentachloro-1,3-butadiene with thiols. The new compounds were characteri…
GaAs processed using gallium-focused ion beams for the fabrication of photonic devices mostly results in gallium nanodots on the surface. These gallium nanodots may produce unwanted effects and deteriorate the optical and electrical properties of the devices. We have investigated the FIB processing of GaAs with and wi…
The influence of parent materials on soil properties has long been recognized. Early pedologists and soil geographers based their concepts of soils largely on its presumed parent material. Later, parent material was viewed simply as a factor that influences soil development-an influence that diminishes in importance w…
In the title compound, [Co(II)Cl(2)(C(6)H(10)N(2))(2)], a pair of 3,4,5-trimethyl-pyrazoles act as monodentate ligands. Two Cl(-) anions are also bonded directly to the Co(II) atom, which has a CoN(2)Cl(2) chromophore in a slightly distorted tetra-hedral geometry. The two mol-ecules in the asymmetric unit are related…
Abstract Crosslinked polyurethanes based on a mixture of toluene diisocyanate, polypropylene glycol, trimethylol propane (TMP), glycerol (GLY), and desmophen (DES) were synthesized with various ratios of DES and GLY. Chemical crosslinks were introduced through the hard segment (TMP, GLY) and through the soft segment (…
Due to the size scale of the molecules they work with, chemists are normally limited to indirect means of inducing and controlling chemical reactions. Sometimes, the inherent reactivity and structure of the reactants and the properties of the products such as thermodynamic stability can be relied upon to give the desi…
Abstract All growth methods for single‐walled carbon nanotubes (SWNTs) usually result in a wide distribution of chiral indices (n,m). Bimetallic catalysts can narrow this distribution 1,2 . Here we grow SWNTs by a Co‐Mo catalyst and measure the different chiral distributions for an array of growth parameters. A CoMo‐a…
Abstract Mixed carboxylate complexes of cerium(III) and yttrium(III), [Ce2(OAc)4(salH)2(OH2)4]·4HOAc and [Y2(OAc)4(salH)2(OH2)4]·2H2sal (HOAc, H2sal ≡ acetic, salicylic acids) have been structurally characterized as tetrakis(acetic) and bis(salicylic) acid solvates, respectively. The dinuclear complex components take…
Quantum mechanical properties of unsymmetrical and unfunctionalized trans-stilbene derivatives 1-3, which had been prepared by solid-phase parallel syntheses, were characterized using mPW1PW91/6-311G(d,p) (hybrid HF-DF) calculations. The total electronic energies, normal vibrational modes, Gibbs free energies, and HOM…
Reaction of [(bpy)Pd] $(PF_6)_2$ (bpy = 2,2'-bipyridine) with racemic bis(isonicotinoyl)-1,1'-bi-2-naphtholate (L) in acetone, and followed by addition of chloroform and solvent evaporation allows to form amorphous micro-bowl morphology consisting of $[(bpy)PdL]_2(PF_6)_4$ without any template or additive. In contrast…
We construct a theoretical model for a thermotropic ferronematic (magnetic liquid crystal colloid) in an asymmetric twisted nematic cell, subject to in-plane magnetic fields. At low colloidal concentrations, the nematic director [ncirc] is unchanged by strong fields, the magnetic director [mcirc] principally responds…
Antimicrobial resistant is becoming a major factor in virtually all hospital acquired infection may soon untreatable is a serious public health problem. These concerns have led to major research effort to discover alternative strategies for the treatment of bacterial infection. Nanobiotehnology is an upcoming and fast…