Advanced Materials Research Vol. 427

Abstract: The effect of activated water on the growth of epidermal cells of newborn mice is studied by cell culture in vitro. To investigate the influence of activated water on the growth of cells, parameters of water are measured. Then, biological mechanism about how the water effects on cells is discussed. It shows that activated water has the promoter action to growth of cells comparing with non-activated water by detecting optical density (OD) at 570 nm with the MTT colorimetry. Statistically, the probability P, less than 0.01, is obvious. We believe that water cluster has become smaller and small water clusters are beneficial for transporting nutrients.

Abstract: The aim of this work was to fabricate novel microPCMs containing dodecanol by an in-situ polymerization using methanol-modified melamine-formaldehyde (MMF) prepolymer as shell material and investigate the interface morphologies of microPCMs/epoxy composites treated by a simulant thermal process with a 10 times repeated temperature variation. A series of microPCMs were fabricated by 1000-3000 r·min^-1 emulsion speed with the PCM contents of 40-70%. Micro-cracks and gaps occurred after a thermal treatment in the interface of microPCMs and epoxy matrix obviously. The internal stress generated by the expansion or shrinking of the microPCMs was the main factor leading to the interface morphology changes and damaged of composites.

Abstract: The thermal degradation of PVC in air ambience was investigated by the thermogravimetric analysis (TGA). The experiments were carried out at different heating rate of 5, 10, 20 and 40°C/min, respectively. The activation energy was calculated by the Friedman method. The pyrolysis mechanism of PVC in air was discussed and compared with that in Nitrogen atmosphere. The pyrolysis process of PVC in air could be divided into two main stages: 200 °C ~ 380 °C and 400 °C ~ 600 °C, which obtained by TGA at the heating rate of 5°C/min. The second stage could be further subdivided into two parts by 465 °C. It can be concluded that the oxygen in air affected the second stage more obviously than that of the first one, in comparison with inert atmosphere. The activation energy of the second stage was still larger than the first stage.

Abstract: The structure of sericite is stable, and it is hard to prepare polymer layered silicate nanocomposites (PLSN). Therefore, structural modification was employed to activate sericite to reduce the layer charger. The thermal treated sericite (S₁) was prepared by thermal modification at 800 for one hour. Then, the resulting product was modified with sodium fluorosilicate, whose effect was characterized by X-ray diffraction (XRD) analysis. The dissolving-out amount of Al³⁺ of salt-treated product (S₂) reached circa 2.55 mg/g at the optimal processing conditions. CEC of S₂ was increased to 10.52 meq/100g compared with that of original sericite (4.94 meq/100g). The results of XRD analysis indicated that mica-type phase persisted after salt modification with sodium fluosilicate.

Abstract: A series of rare earth perovskite-type oxides La₀₉Sr_0.1Co_0.9Mn_0.1O₃La₀₈Sr_0.2Co_0.8Mn_0.2O₃ and La₀₅Sr_0.5Co_0.5Mn_0.5O₃ were prepared along the sol-gel method and characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (SEM), transmission electron microscopy techniques (TEM) and catalytic activity measurement for combustion of CH₄. The results indicated that a perfect crystal structure of perovskite was formed and La³⁺ and Co³⁺ ions were partly replaced by Sr²⁺ and Mn³⁺ ions, respectively, and perovskite-type oxides were composed of nanocrystals with particle size of 20~50nm. The catalytic activity for the combustion of CH4 was evaluated and La₀₅Sr_0.5Co_0.5Mn_0.5O₃ exhibited best performance with the temperature of 50% and 90% conversion efficiency of 723K and 833K.

Abstract: The sepiolite samples were defibered by using microwave chemical technique, and then different sepiolite samples were obtained with different treatment process. The effect of reaction time on the defibering for sepiolite fiber bundles was studied systematically. Through characterization by scanning electron microscope (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscope (FTIR), it was found that the defibered sepiolite samples had an average diameter of about 100 nm and length greater than 20μm. The defibering effect of sepiolite samples as prepared reached optimum at the reaction time of 13 min, and the structural stability of sepiolite was kept after defibering treatment.

Abstract: The silica-alumina-pillared rectorite materials (SiAl-REC) were developed a novel method, which combined several techniques such as ion-exchange, intercalation and surfactant modification. The morphology, composite structure and pore properties of such composite materials, were investigated by X-ray powder diffraction (XRD), Fourier-transform infra-red (FTIR) spectra, as well as Nitrogen Adsorption-Desorption Isotherms. The layer structure of the prepared materials retained and their pore structures were found to be slit-shaped pores located between plate-like particles. The prepared SiAl-REC materials had a BJH pore volume of 0.65cm³ g-1, a remarkably high BET specific surface area940m² g^-1 and a narrow pore size distribution in the mesoporous region 4.3 nm after thermal treatment at 600 °C.

Abstract: Alygorskite is a kind of hydrated magnesium aluminium silicate clay mineral. A novel linear core-shell structured Ni-P coated micro-fiber palygorskite (MFP) was fabricated via an electroless plating process in acid bath. The composition, morphology and structure of the as-prepared products were characterized by the techniques such as powder X-ray diffra-ction (XRD), energy-dispersive X-ray spectrum (EDS), and scanning electron microscopy (SEM). The Magnetic Property of the powders was conducted from a vibrating sample magnetometer (VSM). It was observed that the MFPs surface was compactly coated with irregular Ni-P particle. The XRD patterns indicate the amorphous Ni-P microstructure of coating. Magnetic properties show that coated MFPs are ferromagnetic materials. The satura-tion magnetization (σ_s) and coercivity (jHc) of the powders are 13.86emu/g and 43.97 Oe respectively.

Abstract: Prepared a series of castor oil modified NaHSO₃ waterborne blocked polyurethane, discussed the influence on the emulsion stability by C.O. addition amount, R value, DMPA and the influences on latex film mechanical property and water absorption by C.O. content, R value. Then analyzed the characterization by FTIP and DSC, its shown that emulsion is stable when the R value controlled in the range of 1.4~1.8 and the stability will become poor with the increase of C.O. content; and with the increase of R value the elongation at break of latex film reduced and tensile strength increased. In short the C.O.s mixing can make latex film initial decomposition temperature increased by 60, reduced elongation at break, increased tensile strength and reduced the water absorption.

Abstract: Sericite-TiO₂ composite particle material was prepared via mechano-chemical method. SEMEDS and XPS ananlysis indicates that the surface of the sericite were coated by the TiO₂ layers and the Ti⁴⁺ cations were anchored by formation of SiOTi bonds. Otherwise, the TiO₂-coated sericite powders have higher light scattering indexes and other more outstanding properties than the naked sericite powders. Especially, the whiteness, adsorbed value, and hiding power indexes of the rutile TiO₂-coated sericite powders were higher than those of the anatase TiO₂-coated sericite powders. Hence, rutile TiO₂-coated sericite powders can be substitute for the titanium dioxide pigment.