Materials Literature
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In this paper, the synthesis and micro/nanoscopic characterizations of polymer-clay nanocomposites are briefly introduced. Dynamic response for mode-I crack tip in polymer-clay nanocomposite is studied by combining high speed photography with optical caustic method. A series of caustic spots surrounding the crack tip…
Abstract The reaction of [{Ir(cod)(μ‐Cl)} 2 ] and K 2 CO 3 or of [{Ir(cod)(μ‐OMe)} 2 ] alone with the non‐natural tetrapyrrole 2,2′‐bidipyrrin (H 2 BDP) yields, depending on the stoichiometry, the mononuclear complex [Ir(cod)(HBDP)] or the homodinuclear complex [{Ir(cod)} 2 (BDP)]. Both complexes react readily with ca…
Abstract The effect of hydration on the dielectric constant and loss factor tan δ of viscose hydrocellulose, hydroxypropyl cellulose, and dextran was studied in a wide range of temperatures and frequencies. The results obtained reveal that (1) whereas hydration shows little effect on the variation with temperature of…
Remarkable hydrolytic stability in the range pH 7.0–8.0 is exhibited by the zwitterionic λ5Si-silicate 1, which can even be prepared in water and forms a stable hydrate 1⋅H2O. The synthetic route to 1 and the structure of the zwitterion in the crystal (O red; N blue; Si green; C gray) are shown in the picture.
Abstract This article deals with the effect of the kneading temperature on the crystallization of a matrix polymer and the viscoelasticity of a bamboo‐fiber‐reinforced biodegradable polymer composite. Upon the investigation of poly(butylene succinate) after melt mixing, spherulite generation was observed with polarize…
Abstract The copper complex [CuCl 2 (TzHy)] has been synthesized and its crystal structure determined. The coordination complex contains polymeric [CuCl 2 (TzHy)] n chains in which the units are linked by μ‐chloro bridges. The chains run along the crystallographic c axis. The geometry around the copper(II) is best des…
Novel fibrous Al 2 O 3 –(m‐ZrO 2 )/t‐ZrO 2 (m, monoclinic; t, tetragonal) composites having a core/shell structure were fabricated by multi‐extrusion, and their microstructures and material properties were investigated depending on the number of extrusions. The composites acquired a homogeneously fine fibrous structur…
Abstract The following triblock–comb copolymers of isoprene (I) and styrene (S)—PS‐ b ‐(PI‐ g ‐PI)‐ b ‐PS, PS‐ b ‐[PI‐ g ‐(PI‐ b ‐PS)]‐ b ‐PS, and (PS‐ g ‐PS)‐ b ‐(PI‐ g ‐PI)‐ b ‐(PS‐ g ‐PS) (where PS is polystyrene and PI is polyisoprene)—with PS contents of 20–30% were synthesized with high‐vacuum techniques and the…
Inorganic-organic hybrid nanostructures doped with magnetic ions have been synthesized via substitution of Zn by Co or Fe in the ZnSe(L)0.5 systems under solvothermal conditions. These dilute magnetic semiconductors (DMS), Zn(1-x)MxSe(L)0.5 (M = Co, Fe; L = ethylenediamine or en, 1,3-propanediamine or pda; 0 < x < 1),…
Abstract A crystal growth rate equation, parameterized from molecular dynamics simulations of n ‐alkanes, is compared to recent experiments on growth rates for polyethylene at high undercooling. The analysis reveals that the growth rate of alkanes and polyethylene can both be described by the same relationship. The ap…
The tribological characteristics of a diamondlike carbon (DLC) film deposited on high‐speed steel were investigated systematically by using a ball‐on‐flat reciprocating tribometer over a range of temperatures (from −40° to 20°C). The results indicated that the temperature dependence of the DLC film's tribological beha…
There is an ongoing interest on the photoluminescence (PL) and related properties of doped nano ZnS since there is a large change in their PL properties with particle size reduction. Such PL properties are theoretically predicted to be much enhanced with ZnS particle sizes below the Bohr radius, i.e., in ZnS for parti…
Abstract Iron oxides, oxyhydroxydes and oxycarbonates derived from the layered Ruddlesden‐Popper (RP) structure form a large family of layered compounds. Besides the classical RP oxides Sr n+1 Fe n O 3n+1 , single intergrowths with the generic formulation (A,Sr) n+2 Fe n O 3n+2 and (A,Sr) n+3 Fe n O 3n+3 (A = Tl, Pb,…
Abstract Crystal structures of R 3 CuSnS 7 (R = La–Nd, Sm, Gd–Ho) (La 3 CuSiS 7 structure type, space group P 6 3 , Pearson symbol hP24 ) were determined by means of X‐ray single crystal diffraction ( a = 1.0317(1) nm, c = 0.60274(7) nm, R 1 = 0.0202 for La 3 CuSnS 7 ; a = 1.0209(1) nm, c = 0.60150(7) nm, R 1 = 0.0273…
Rare-earth ion (Ce3+, Tb3+) doped LaPO4 nanoparticles were prepared by the polyol method and characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), UV-vis absorption spectroscopy, photoluminescence (PL) spectroscopy, and lifetimes. The results of XRD indicate that the as-prepar…
Hydrothermal reaction of the mixed thiolate-carboxylate-aromatic amine ligand, 6-mercaptonicotinic acid (6-mnaH2) with Co(II) and Ni(II) leads to two network coordination solids [M9(6-mna)8(mu3-O)2(OH3)2(OH2)6] (M = Co, Ni), 1, and [M2Ni12(6-mna)12(mu3-OH)2(OH2)6] x 8H2O (M = K, Rb, Cs), 2. These compounds are unusual…
Abstract A natural fiber hybrid composite containing equal proportions of kenaf fibers (KFs) and wood flour (WF) as the reinforcements and polypropylene (PP) as the polymer matrix was prepared, and its static and dynamic mechanical properties were compared with KF/PP and WF/PP composites. Static tensile and flexural t…
The present contribution reports the unlubricated friction and wear properties of Ti 3 SiC 2 against steel. The fretting experiments were performed under varying load (1–10 N) and the detailed wear mechanism is studied using SEM‐EDS, Raman spectroscopy, and atomic force microscopy. Under the selected fretting conditio…
The knowledge of the inelastic double differential scattering cross section (DDSCS) is of utmost importance for microanalysis in electron energy loss spectrometry (EELS) in the electron microscope and for the investigation of electron energy loss near edge structure (ELNES). Calculations are usually based on a nonrela…
Abstract Water‐soluble, electrically conductive polyaniline (PANI)–poly(vinyl alcohol) (PVA) blends of different compositions (10, 30, 50, and 70 w/w) were synthesized by emulsion and inverted emulsion methods with ammonium persulfate and benzoyl peroxide as the oxidants, respectively, with PANI protonated with sulfos…