Ultrahigh molecular mass polyethylene (UHMMPE) is filled with carbon nano-tubes (CNTs) by solution in the presence of maleic
anhydride grafted styrene-(ethylene-co-butylene)-styrene copolymer (MA-SEBS) as a compatibilizer. The UHMMPE/CNT composites
crystallized from melt were prepared at a cooling rate of 20C min-1. The melting and crystallization behaviors of UHMMPE/ CNT composites were investigated by differential scanning calorimetry.
The results showed that onset melting temperature (Tm) and degree of crystallinity (Xc) of UHMMPE/CNT composites crystallized from solution are higher than those from melt due to the larger crystalline lamellar
thickness. The onset crystallization temperature (Tc) of UHMMPE/CNT composites tends to shift to higher temperature region with increasing CNT content in the composites. Tm and
Tc of UHMMPE phase in UHMMPE/CNT composites decrease with the addition of MA-SEBS. Moreover, the crystallization rate of UHMMPE
phase in UHMMPE/CNT composite is increased due to the introduction of CNTs. MA-SEBS acts as compatilizer, enhances the dispersion
of CNTs in the UHMMPE matrix. Thereby, the crystallization rate of UHMMPE phase in UHMMPE/CNT composite is further increased
with the addition of MA-SEBS.
Authors:J. Ying, S. Liu, F. Guo, X. Zhou, and X. Xie
Polypropylene (PP) /ethylene-octene copolymer (POE) blends with different content of POE were prepared by mixing chamber of
a Haake torque rheometer. The crystallization behaviors and crystal structure of PP/POE blends were systematically investigated
by differential scanning calorimetry (DSC), wide angle X-ray diffraction (WAXD) and polarized optical microscopy (POM). The
results showed that PP spherulites became defective and the crystallization behavior was influenced intensely with the introduction
of POE. At the low content of POE, the addition of POE decreases the apparent incubation period (Δti) and the apparent total crystallization period (Δtc) of PP in blends due to the heterogeneous nucleation of POE, and small amount of β-form PP crystals form because of the existence
of POE. However, at high content of POE, the addition of POE decreases the mobility of PP segments due to their strong intermolecular
interaction and chain entanglements, resulting in retarding the crystallization of PP, decreasing in the amount of β-form
PP crystals, and increasing in Δti and Δtc of PP in blends.
Authors:A.-M. Hu, K.-M. Liang, G. Wang, F. Zhou, and F. Peng
The processes of nucleation of Li2O-Al2O3-SiO2 glasses with TiO2 and TiO2+ZrO2 as nucleating agents were discussed. The DTA peak temperature and DTA peak height shown a strong dependence on the nucleation
temperature in the glass with TiO2, while in the glass with TiO2+ZrO2 this tendency was small. The optimum nucleation temperatures were 745 and 760°C for two glasses. It suggested that with TiO2+ZrO2 as nucleating agents, the crystallization had lower sensitivity for nucleation temperature, and the glass had higher nucleation
efficiency than with TiO2.
Authors:X.-L. Zhou, Y. Yang, Z.-F. Li, B.-H. Wang, and Y.-M. Zhang
The effects of cisplatin and its trans isomer transplatin on the thermal denaturation of G-actin were studied with a Micro DSC-III differential scanning calorimeter. The denaturation enthalpy of G-actin was found to be 12 J g–1, and the denaturation temperature was 328 K. The thermal denaturation curve showed that increasing cisplatin concentration decreased the enthalpy change. However, after the ratio of cisplatin to G-actin attained 8:1 (mol:mol), the denaturation enthalpy no longer decreased. Transplatin decreased the enthalpy change more rapidly. In contrast with cisplatin, the denaturation peak at 328 K disappeared, and a strong exothermic peak appeared at 341 K when the ratio of transplatin to G-actin was 8:1 (mol:mol). The enthalpy change was 75 J g–1, which is far in excess of the range of weak interactions. This strong exothermic phenomenon probably reflects the agglutination of protein. The effects of cisplatin and transplatin on the number of the free thiol groups of G-actin are discussed.
Authors:Craig Priest, Syed F. Hashmi, Jingfang Zhou, Rossen Sedev, and John Ralston
Microfluidic solvent extraction (microSX) of metal ions from industrial grade mineral leach solutions was studied. In conventional bulk-scale SX, partially hydrophobic nanoparticles that are present in the leach solution readily adsorb at the liquid-liquid interface of the dispersed droplets, causing delayed or incomplete phase separation and reduce efficiency. In contrast, microSX employs continuous microscopic streams of aqueous and organic phases (without mixing the phases) and, in this way, bypasses the need for a conventional phase separation stage. This makes the technique promising for handling complex leach solutions. The stability of the two-phase flow is considered in terms of the surface wettability and guiding geometry of the microchannel, which determines the Laplace pressure window that stabilizes the liquid-liquid interface. We show that careful characterization of the microchannel wettability, including contact angle hysteresis, is essential to predict long-term flow stability.
Authors:H. J. Ding, Y. N. Niu, Y. B. Xu, W. F. Yang, S. G. Yuan, Z. Qin, and X. H. Zhou
extraction of protactinium with Aliquat 336 (methyl-tri-caprylyl ammonium
chloride) in toluene, cyclohexane and chloroform from HCl, HNO3, H2SO4,
HClO4, HF and mixed HCl-HF media was investigated by radioactive
tracer technique. Distribution ratios of protactinium between the aqueous
solution and the organic phase were determined as a function of shaking time,
concentrations of acid in aqueous solution phase, extractant concentration and
type of diluents in the organic phase. Aliquat 336 can almost quantitatively
extract protactinium from strong HCl solution. At the same time, small amounts
of HF in HCl solutions have a strong effect on Pa distribution.
Authors:J. Yao, F. Wang, L. Tian, Y. Zhou, H. Chen, K. Chen, N. Gai, R. Zhuang, T. Maskow, B. Ceccanti, and G. Zaray
Using TAM III multi-channel calorimetry combined with direct microorganism counting (bacteria, actinomycetes and fungi) under
laboratory conditions, we determined the microbial population count, resistance and activity toward cadmium (Cd(II)) and hexavalent
chromium (Cr(VI)) toxicity in soil. The thermokinetic parameters, which can represent soil microbial activity, were calculated
from power-time curves of soil microbial activity obtained by microcalorimetric measurement. Simultaneous application of the
two methods showed that growth rate constant (k), peak-heat output power (Pmax) and the number of living microorganisms decreased with increasing concentration of Cd and Cr. The accumulation of Cr on
E. coli was conducted by HPLC-ICP-MS. Cr6+ accumulation by Escherichia coli was increased steadily with increasing Cr6+ concentration. The results revealed that the change in some thermo-kinetic parameters could have good corresponding relationship
with metal accumulation. Our work also suggests that microcalorimetry is a fast, simple, more sensitive, on-line and in vitro
method that can be easily performed to study the toxicity of different species of heavy metals on microorganism compared to
other biological methods, and can combine with other analytic methods to study the interaction mechanism between environmental
toxicants and microbes.
Authors:J. Ma, J. Cao, M. J. Ding, L. H. Yuan, M. J. Zhai, J. Zhang, Q. Zhang, F. Li, and X. M. Zhou
A reversed-phase chiral liquid chromatographic method had been developed and validated for resolution of the enantiomers of racemic fudosteine. The effects on the separation of the amounts of anhydrous cupric sulfate and l-phenylalanine, the methanol content, mobile phase pH, and temperature were investigated. The method was validated for linearity, repeatability, intermediate precision, sample recovery, solution stability, and limits of detection (LOD). l-Phenylalanine and anhydrous cupric sulfate as chiral ligand-exchange complexes were used for separation, isomer identification, related substance investigation, and analysis of fudosteine enantiomers in fudosteine bulk drugs and fudosteine tablets.