Papers by Keyword: Dissolution Rate

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Authors: Ting Ting Sun, Yong Tang Jia, Wei Li Nie, Gang Huang, Feng Chun Dong
Abstract: The dissolution rate of bagasse cellulose in LiCl/DMAc solution actived by thermal DMAc and KMnO4 were compared. The effects of several factors on the dissolution rate were discussed, including cellulose concentration, LiCl concentration, solution temperature, and disssolving time. The results showed that the dissolution rate of bagasse cellulose actived by KMnO4 is higher than that actived by thermal DMAc. The dissolution rate increased with the increasing of LiCl concentration, solution temperature, and dissolving time, respectively.
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Authors: Hee Song, Soo Ryong Kim, S.J. Jung, J.K. Lee, Hee Joong Kim, Y. Kim
Abstract: Silicon containing self setting bone cement has been prepared by adding silicon containing hydroxyapatite whisker to obtain a biomaterial having an improved resorption properties. Silicon containing calcium phosphate bone cement was composed of a-TCP: TeCP: DCPD: Si-HA whisker with a NH4H2PO4 as a setting liquid. From the XRD analysis, it was confirmed that calcium deficient hydroxyapatite phase appeared when it immersed in PBS solution. The dissolution rate of silicon containing calcium phosphate cement was measured in PBS solution and showed high dissolution rate. Based on in-vivo test, silicon containing self setting bone cement can be considered a useful material for bone bonding materials.
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Authors: Hirohiko Watanabe, Marie Nagai, Tsutomu Osawa, Ikuo Shohji
Abstract: Dissolution properties of Cu in molten Sn-Ag-Cu-Ni-Ge alloys have been investigated. In particular, the effect of the Ni content in the alloys on the dissolution properties has been examined. Moreover, the dissolution properties have been compared with those of Sn-Ag and Sn-Ag-Cu alloys. To investigate the dissolution rate of Cu in molten alloys, Cu wires were dipped in molten alloys heated at 250, 270 and 290°C. Dissolution thickness of Cu wire is proportional to dipping time regardless of alloy type. The dissolution rates of Cu follow the order Sn-Ag > Sn-Ag-Cu > Sn-Ag-Cu-Ni-Ge. In Sn-Ag-Cu-Ni-Ge alloys, the dissolution rate of Cu decreases with increasing the Ni content. In cases of Sn-Ag and Sn-Ag-Cu alloys, a thin Cu-Sn compounds layer forms at the interface between Cu and the alloy and dissolution of Cu does not proceed uniformly. On the contrary, a thick reaction layer, which consists of granular Cu-Ni-Sn compounds, forms at the interface between Cu and the Sn-Ag-Cu-Ni-Ge alloy. Since the reaction layer inhibits dissolution of Cu in molten alloy, the dissolution rate slows down and dissolution of Cu proceeds uniformly in the Sn-Ag-Cu-Ni-Ge alloys.
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Authors: Hui Wang, Hong Xin Xu, Na Zhang, Lian Dong Hu
Abstract: The purpose of this study was to enhance the dissolution rate of daidzein (DZ) by solid dispersions. DZ solid dispersion was prepared by solvent method, with PVP K30 and surfactant as carriers. The influences of drug-carrier proportion, the kind of surfactant and the amount of surfactant on the dissolution of DZ were examined. Solid dispersions were characterized by infrared spectroscopy (IR), X-ray diffraction spectroscopy, and dissolution tests. When appropriate amount of poloxamer was added into the solid dispersion, the dissolution of DZ could be improved obviously. The data of IR showed that the absence of well-defined drug-polymer interactions. The data of X-ray diffraction showed that the drug might exist in the form of amorphism or molecule in solid dispersions. Both the binary and ternary solid dispersions enhanced the dissolution of DZ. Moreover, poloxamer played an important positive role in improving the dissolution rate of DZ in the solid dispersion.
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Authors: Yan Bing Zong, Yu Li, Da Qiang Cang
Abstract: Composition of stainless steel slag was compared with that of ceramic paste first. DTA curves of ceramic samples were obtained to determine the firing temperature schedule. It is concluded that the stainless steel slag mixed with certain chemically pure materials can serve as raw material for the production of high added value ceramics. Pilot plant scale tests show that the principal crystal phase is diopside, contributing to the making of high strength and high density ceramics. Heating rate, cooling rate and holding time should be controlled appropriately during sintering process for the sake of forming and growth of crystals. The total performance detection of ceramic samples accords with national standards in China when stainless steel slag is used to sinter calcium-magnesium-silicon type ceramic in roller kiln. The proportion of stainless steel slag is 45% during pilot tracey. Dissolution rate of chromium during stainless steel slag used as mainly diopside type of building ceramic is only 25.17 mg/kg ceramic, which resolves the harmless of chromium. This work provides a feasible and effective way for resource of stainless steel slag.
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Authors: Tadashi Takemoto
Abstract: Sn-based lead-free solders have some characteristics that are different from the conventionally used Sn-Pb eutectic. One is the high dissolution rate of metals and alloys into molten lead-free solder. Several problems due to this high dissolution rate were reviewed. The prominent materials that suffered from this high dissolution rate are copper and iron based. High dissolution rate of Cu resulted in thick Cu-Sn intermetallic compound formation during soldering and Cu enrichment in wave soldering bath. The iron-based materials used for soldering equipments are damaged by erosion. Suppression of the dissolution rate is important to secure quality of micro-soldered joints, to prevent contamination of solder bath and to prolong the life of soldering equipments. The method of suppressing dissolution in practical soldering operation and some examples of erosion damage are introduced.
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Authors: Gui Zhen Ke, Yi Wen Guo, Hai Ling Zhan, Wei Dong Yu
Abstract: Wool fiber was dissolved with compound solvent(urea, β-mercapitoethanol and sodium dodecyl sulfate(SDS)) and stable keratin aqueous solution was prepared through filtration and dialysis. Dissolution rate under different conditions was disscused. The results showed that dissolution rate increased with the increase of dissolving temperature, reduction β-mercaptoethanol and assistant agent urea concentration and the addition of SDS. SDS PAGE showed the major molecular weight of the aqueous keratin solution was about 44.3KDa.
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Authors: Jun Qi Li, Yong Zou, Chao Yi Chen, Yong Zhen Jia
Abstract: Dissolution behavior of high titanium bauxite was investigated. The effect of several factors on dissolution of alumina and titanium dioxide were examined. The experimental results showed that the titanium dioxide dissolution rate was 9.82% and alumina relative dissolution rate was 88.83% under the best dissolution conditions for dissolution temperature of 240°C, lime add volume of 4%, and alkali concentration of 220g/L.
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