Materials Literature
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Computer simulations of a simple model of liquid crystals confined between parallel walls have been used to investigate the properties of nematic wetting films and the planar nematic–isotropic interface. Comparison is made with the theoretical predictions of Onsager’s density-functional theory, obtained by numerical m…
In the applications of thermoluminescence (TL) in dosimetry and archaeological dating, it is usually assumed that the measured TL depends on the total dose applied and it is independent of the dose rate. Thus, calibration of a TL specimen is usually performed at a significantly higher dose rate than that of the dose t…
Multiwall carbon nanotubes (MWCNTs) were fabricated by a new cathodic vacuum arc method, in which the anode itself was the vacuum chamber and was inert. The cathodic vacuum arc discharge was performed at 0.5 Pa of He and H 2 gas atmospheres using a dc arc current of 100 A. The cathode materials were pure graphite and…
Isotherm hysteresis and pore-blocking effects of trapped molecules on adsorption dynamics is studied here, using the iodine−carbon system in the 300−343 K temperature range. It is found that a portion of the iodine is strongly adsorbed, and does not desorb, even over very long time scales, while the remainder adsorbs…
We have studied thermal composition fluctuations of a ternary symmetric homopolymer/diblock copolymer system of PEE/PDMS/PEE-PDMS [PEE and PDMS being poly(ethyl ethylene) and poly(dimethyl siloxane), respectively] in its disordered state with small angle neutron scattering for concentration Φ of diblocks up to 15%. Th…
This study describes the syntheses and thermal properties of aromatic boronic acids and their use as flame retardants. The possible flame-retardancy mechanisms are also discussed. The materials were synthesized from aromatic bromides using one of two procedures. The first procedure involved traditional approaches to b…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTFabrication of Ordered Porous Structures by Self-Assembly of Zeolite NanocrystalsLimin Huang, Zhengbao Wang, Jinyu Sun, Lei Miao, Quanzhi Li, Yushan Yan, and Dongyuan ZhaoView Author Information Department of Chemistry, Fudan University Shanghai 200433, P. R. China Dep…
Hybrid thin films are prepared from 8 to 10 nm Fe 3 O 4 nanoparticles and exfoliated montmorillonite clay by using layer-by-layer assembly on poly(diallyldimethylammonium bromide), PDDA. Distinct stratification of the Fe 3 O 4 /PDDA/clay films is obtained due to the sheetlike structure of the clay particles. This feat…
In this work we investigate the influence of the use of YSZ and CeO2/YSZ as insulators for Metal- Ferroelectric-Insulator-Semiconductor (MFIS) structures made with SrBi2Ta2O9 (SBT). We show that by using YSZ only the a-axis oriented Pyrochlore phase could be obtained. On the other hand the use of a CeO2/YSZ double-buf…
We show that whereas the critical point is very sensitive to the range of interaction, the second virial coefficient has a fairly constant value at the critical temperature. This enables us to predict the critical temperature with fair accuracy. We discuss the connection between the second virial coefficient as a pred…
Nanocrystalline ferromagnetic La 0.7 Ca 0.3 MnO 3 perovskites with magnetoresistance effect have been successfully prepared by mechanical alloying. Thermal transformation of the amorphous phase, resulting from ball milling, to perovskite structure was studied by differential scanning calorimetry. Following the law of…
A series of degradable polyurethanes of variable soft segment chemistry and content were synthesized and characterized. An amino acid-based diester chain extender was used to confer degradability and both polycaprolactone diol (PCL) and polyethylene oxide (PEO) were used as soft segments. In addition, the diisocyanate…
The magnetic structures of tetragonal La 0.8 Y 0.2 Mn 2 Si 2 have been investigated by neutron diffraction measurements over the temperature range ~2 - 513 K. This compound corresponds to the critical concentration x c ~ 0.2 in the La 1 - x Y x Mn 2 Si 2 series for the transition from the antiferromagnetism of YMn 2 S…
Density functional quantum chemical calculations have been used to compare the acid strengths of phosphotungstic and phosphomolybdic acids by computing the adsorption energy of ammonia on model clusters of each heteropolyacid. The adsorption of ammonia on a phosphotungstic acid cluster was stronger than the adsorption…
Char oxidation is often modeled using an m th order intrinsic reaction rate in conjunction with an effectiveness factor (η) to account for intraparticle diffusion of gas species. This approach involves the use of a general modulus ( M T ) and using the first-order curve of η vs M T . This method was originally referre…
A study of the influence of employing ultrahigh molecular weight polyethylene (UHMWPE) on the toughness of CaCO3/high-density polyethylene (HDPE) composites was carried out. Binary and ternary HDPE-based composites with calcium carbonate in the range of 0–40% and UHMWPE in the range of 0–50% were produced by twin-scre…
Melon-seed and rubber-seed oils have been used in the synthesis of polyester resins. Results reveal that rubber-seed oil can completely be substituted for linseed and soyabean oils in the synthesis of both long and medium-oil–length polyester resins. Melon-seed oil was found to be a substitute for 50% of linseed oil a…
Tris(2,2‘-bipyridine)ruthenium(II) ([Ru(bpy) 3 ] 2+ )−fluortetrasilicic mica−poly(vinylpyrrolidone) intercalation compounds were prepared by the intercalation of poly(vinylpyrrolidone) into the presynthesized [Ru(bpy) 3 ] 2+ −fluortetrasilicic mica intercalation compounds. The formation of the intercalation compounds…
2,2′-Mercaptoethylsulfide dimethacrylate (MESDMA) was synthesized from 2,2′-mercaptoethylsulfide (MES) by a Phase-Transfer Catalysis technique and, was characterized and corroborated by 1H-NMR and FTIR spectra. Except for the poor impact strength, the MESDMA homopolymer resin shows better comprehensive properties, suc…
Sulfur-cured filled natural rubber (NR) is successfully reclaimed by using a renewable resource material (RRM) and diallyl disulfide (DADS), which is the major constituent of RRM. Reclaiming of NR vulcanizate was carried out at 60°C for 35 min in an open two-roll mixing mill. Evaluation of the properties of NR reclaim…