Advanced Materials Research Vols. 535-537

Abstract: Inkjet Printing is a non-contact printing, and it has wide adaptability, high speed and intelligence, low cost and no pollution as well, so it is the best printing form for food and drug surface printing. Drops control technology is the key to the development of ink-jet printing technology, and viscosity is also the key factor that influences the drop state. In this article, the samples which have different viscosity are got by the way of adding different levels of resin to the ink. Drop state is observed through drops observatory, the speed, tail length and volume are measured by it in order to evaluate the influence of viscosity to ink-jet drop state. The result shows that viscosity has big influence to ink-jet drop state, if the viscosity is larger, the speed of drops is smaller. The ink with high viscosity is easier to gather into a circular drop than that with small viscosity. If the viscosity more than 13.2mPa•s, the rupture time and tail length of the drop increases along with the increase of viscosity. When the viscosity is 10.3mPa•s, its rupture time is 80s and the ink soon gather into a circular drop under the action of cohesion, its drop state is the best.

Abstract: The synthesis of hydrophobic sol by one-step sol-gel process ammonia catalyzed was investigated. The water molar ratio and catalyst molar ratio were discussed to prevent phase segregation during the hydrolysis and co-condensation of the organic and inorganic precursors. The reactant system with water molar ratio 70 could make the reaction rate of MTES slightly less than that of TEOS, so that the hydrolysis - condensation – gelling reaction with MTES and TEOS as co-precursors could be synchronously. With the increase of the MTES/TEOS molar ratio, the reaction rate of the silica sol preparation decreased, the hydrophobicity of the sol and gel increased as the molar ratio MTES/TEOS change from 0.5~4. But the hydrophobicity of the methyl-modified silica sol and gel prepared with pure MTES in the sol-gel process were slightly lower than that of the methyl-modified silica sol and gel prepared with MTES and TEOS as co-precursors.

Abstract: Ba2B5O9Cl whiskers with uniform morphology were synthesized by a simple flux method, using BaCl2•2H2O, H3BO3 as the starting materials, and KCl as the flux. The products were characterized by X-ray diffraction (XRD) and scanning electron microcopy (SEM), and the optimum conditions for preparing high quality Ba2B5O9Cl whiskers were studied. Results show that a sintering temperature around 700 °C, an Ba/B mole ratio of 1:3 and a raw materials to flux mass ratio of 1:2 lead to uniform orthorhombic Ba2B5O9Cl whiskers with a diameter of 0.4-1.0 µm and a length of 10-25 µm.

Abstract: Single crystal of Rutile has been grown successfully by the flame fusion method by using high purity (4N5) ultrafine titania powder as starting material. The effects of growth atmosphere, growth rate and temperature gradient in the chamber on crystal growing were investigated and the specific growth conditions have been defined. The annealing of the as-grown crystals was performed in the oxygen and in the air respectively. It was shown that growth atmosphere where the oxygen partial pressure is higher than that of the oxygen decomposing pressure at the liquid-solid interface is a necessary condition for growing perfect crystals. In addition to reducing thermal stresses, the more important role of annealing is to eliminate oxygen vacancies by oxidization reaction. The annealing time can be considerably shortened in an oxygen atmosphere as compared to in the air and the grown crystal has more perfect structure.

Abstract: In this paper , a new treatment method based on polyacrylonitrile (PAN) based carbon fiber treated by supercritical carbon dioxide (SCCO2) is proposed. This method aiming to obtain a controlled interface is green and pollutionless . The surface state of carbon fibers both untreated and treated on different temperature was studied by using SEM, AFM and XPS. The results show that SCCO2 can erode the surface of carbon fibers. Roughness of modified carbon fiber is higher than that of the untreated. Interfacial properties of the treated carbon fiber /epoxy microcomposites were improved. Interfacial shear strength (ILSS) of CFRP shows that treated carbon fiber /epoxy at a lower temperature can be increased by 17.35%, which means that an effect of optimized interface is obtained.

Abstract: The postharvest Litchi (Litchi chinensis Sonn.) fruit was treated with colour protective agent composed of 1% citric acid and 3% NaCl and stored in modified atmosphere (5%CO₂/5%O₂/90%N₂) at (4±1)°C. The anthocycanin, moisture content and the browning index of the pericarp were investigated as factors responsible for the decline of the exterior quality, while the soluble solid content, titratable acidity and the ascorbic acid content of pulp were measured as factors responsible for the decline of the interior quality. The results showed that both the exterior quality and interior quality of Litchi fruit with postharvest treatments were better than that without any treatments. The shelf life of the samples which were dipped in the colour protective agent and packaged in modified atmosphere bags could prolong to 39 days. The good fruit rate was more than 90% with the browning index 1.52.

Abstract: Temperature-controlled HNO3-H2O2 wet digestion and flame atomic absorption spectrometry (FAAS) were employed in the determination of mineral elements in the fermented liquid residue of livestock dung. The 8 most common mineral elements-K, Na, Fe, Mn, Cu, Zn, Ca and Mg-in fermented liquid were selected for analysis, and the experimental results showed that the correlation coefficient (r) of each mineral element’s quantitative standard curve was >0.9993, the quantitation limit was 0.90-67.0 ng/L, the relative standard deviation (RSD) was 0.79%-2.51%, and the standard addition recovery rate was 95%-103%. It was found that the average content of the 8 mineral elements in fermented liquid was in a descending order of K, Na, Ca, Mg, Fe, Mn, Zn and Cu.

Abstract: The degree pattern of a finite group G associated with its prime graph has been introduced in [1] and denoted by D(G). The group G is called k-fold OD-characterizable if there exist exactly k non-isomorphic groups H satisfying conditions |G|=|H| and D(G)=D(H).Moreover, a 1-fold OD-characterizable group is simply called an OD-characterizable group. In this paper, we will show that the symmetric group S₄₉ can be characterized by its order and degree pattern. In fact, the symmetric group S₄₉ is 3-fold OD-characterizable

Abstract: The toughness of blends composed of PA6 and acrylonitrile-butadiene-styrene (ABS) compatibilized by using styrene-maleic anhydride (SMA) as a compatibilizer was measured over a wide temperature region. The addition of SMA results in a significant increase of the PA6 phase viscosity due to the in situ formation of graft polymers during the melt processing, and the significant change in viscosity ratio between the PA6 and ABS due to the formation of SMA-g-PA6 graft polymer may be prevent the coalescence of the dispersed phase. All results in this paper were consistent, and showed the good interaction between PA6 and ABS, which were proved by the morphology and mechanical properties of the blends.

Abstract: Semisolid A356 alloy feedstock was generated by reversed cone channel pouring. The influence of pouring temperatures and the reversed cone angle on the semisolid microstructure were investigated, and the microstructure of the slurry after soaking was also studied. The results indicate that the suitable pouring temperature for obtaining semisolid feedstock is not above 660°C and the semisolid microstructure can be improved by increasing the reversed cone angle, but proper reversed cone angle should be considered for avoiding solid shell in the condition of big reversed cone angle.