{"title":"Determination of Particle Size Distribution (PSD) of Highly Concentrated Inorganic Fine Particle Suspensions Using Ultrasonic Attenuation Spectroscopy, Examination of Measurement Reproducibility and Accuracy","authors":"Kinue Yada, Kazuyuki Hosoi, S. Takeda","doi":"10.4011/SHIKIZAI.81.280","DOIUrl":"https://doi.org/10.4011/SHIKIZAI.81.280","url":null,"abstract":"近年開発された超音波減衰法を用いて高濃度系無機粉体スラリーの粒度分布を測定し, 従来から用いられているレーザー回折法, 光子相関法による希薄系粒度分布測定との再現性および精度の比較を行った。その結果, 測定の再現性については, 超音波減衰法を用いた場合は従来法と同等以上の良好な再現性を得た。また測定精度については, 従来法と同等の粒子径の値を得た。これらの結果から, 超音波減衰法を用いた粒度分布測定によって, 高濃度系無機粉体スラリーを希釈することなく粒子径を評価することが可能であり, この手法が工程管理に有用であることが見いだせた。","PeriodicalId":21870,"journal":{"name":"Shikizai Kyokaishi","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85743301","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We prepared chemical compounds whose Ce 3+ ions are replaced with Bi 3 + ions at a certain rate in LiCeMo 2 O 8 , NaCeMo 2 O 8 , Ca 0.5 CeMo 2 O 8 , and Sr 0.5 CeMo 2 O 8 that have the sheelite crystal structure, and the change of the hue of these materials was investigated. In addition, the cause of Ce 3+ ion color development in the sheelite structure was studied based on the result of substituting Bi 3+ ions for Ce 3+ ions and change of the hue of the compounds whose Mo 6+ ions are replaced with W 6+ ions. The result revealed that the absorption edge shifted to the longer wavelength side as the amount of the replaced Bi 3 + ions increased, and the hue of the product changed from yellow to reddish yellow. The changes in the chemical bonding nature of the crystal were found to give a great impact on the color development of the Ce 3+ ion. Although the Ce 3+ ion takes on the yellow hue in the sheelite crystal structure, its absorption edge can be shifted freely by generating the substitutional solid solution of metal ions with different electronegativity.
{"title":"The Color Sift of Cerium Molybdenum Sheelite by Substituting Bi3 + or W6 + Ion","authors":"T. Odaki, K. Hashimoto, Y. Toda","doi":"10.4011/SHIKIZAI.81.73","DOIUrl":"https://doi.org/10.4011/SHIKIZAI.81.73","url":null,"abstract":"We prepared chemical compounds whose Ce 3+ ions are replaced with Bi 3 + ions at a certain rate in LiCeMo 2 O 8 , NaCeMo 2 O 8 , Ca 0.5 CeMo 2 O 8 , and Sr 0.5 CeMo 2 O 8 that have the sheelite crystal structure, and the change of the hue of these materials was investigated. In addition, the cause of Ce 3+ ion color development in the sheelite structure was studied based on the result of substituting Bi 3+ ions for Ce 3+ ions and change of the hue of the compounds whose Mo 6+ ions are replaced with W 6+ ions. The result revealed that the absorption edge shifted to the longer wavelength side as the amount of the replaced Bi 3 + ions increased, and the hue of the product changed from yellow to reddish yellow. The changes in the chemical bonding nature of the crystal were found to give a great impact on the color development of the Ce 3+ ion. Although the Ce 3+ ion takes on the yellow hue in the sheelite crystal structure, its absorption edge can be shifted freely by generating the substitutional solid solution of metal ions with different electronegativity.","PeriodicalId":21870,"journal":{"name":"Shikizai Kyokaishi","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81135969","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2005-01-01DOI: 10.4011/SHIKIZAI1937.78.112
Shintaro Akiyama, Tomokazu Yoshimura, K. Esumi
Three different platinum-biopolymer nanocomposites have been prepared independently in the presence of hexachloroplatinic acid and biopolymers like fucoidan, alginic acid and sodium hyaluronate (NaHA) via sodium borohydride reduction. The average particle diameter of platinum nanoparticles using fucoidan becomes slightly smaller, with a decrease of the concentration of fucoidan, ranging from 3.1 to 2.6nm. On the other hand, the average particle diameter of platinum nanoparticles using NaHA becomes slightly larger, with a decrease of the concentration of NaHA, ranging from 3.4nm to 3.8nm. The average particle diameter of platinum nanoparticles using alginic acid is 3.2-3.4nm which is independent of the biopolymer concentrations. The antioxidant activities of the platinum-biopolymer nanoconiposites upon elimination of hydroxyl radicals formed in an H 2 O 2 /FeSO 4 system have been studied using a spin-trapping method; All the nanocomposites exhibit high catalytic activities that are affected by the concentration and the kind of the biopolymer. In addition, the activities of the platinum-biopolymer nanocomposites are higher than those of the gold biopolymer nanocomposites. The highest antioxidant activity for the platinum-alginic acid nanocomposites was 110 times higher than that of ascorbic acid.
{"title":"Antioxidant activity of noble metal (gold, platinum)-biopolymer nanocomposites","authors":"Shintaro Akiyama, Tomokazu Yoshimura, K. Esumi","doi":"10.4011/SHIKIZAI1937.78.112","DOIUrl":"https://doi.org/10.4011/SHIKIZAI1937.78.112","url":null,"abstract":"Three different platinum-biopolymer nanocomposites have been prepared independently in the presence of hexachloroplatinic acid and biopolymers like fucoidan, alginic acid and sodium hyaluronate (NaHA) via sodium borohydride reduction. The average particle diameter of platinum nanoparticles using fucoidan becomes slightly smaller, with a decrease of the concentration of fucoidan, ranging from 3.1 to 2.6nm. On the other hand, the average particle diameter of platinum nanoparticles using NaHA becomes slightly larger, with a decrease of the concentration of NaHA, ranging from 3.4nm to 3.8nm. The average particle diameter of platinum nanoparticles using alginic acid is 3.2-3.4nm which is independent of the biopolymer concentrations. The antioxidant activities of the platinum-biopolymer nanoconiposites upon elimination of hydroxyl radicals formed in an H 2 O 2 /FeSO 4 system have been studied using a spin-trapping method; All the nanocomposites exhibit high catalytic activities that are affected by the concentration and the kind of the biopolymer. In addition, the activities of the platinum-biopolymer nanocomposites are higher than those of the gold biopolymer nanocomposites. The highest antioxidant activity for the platinum-alginic acid nanocomposites was 110 times higher than that of ascorbic acid.","PeriodicalId":21870,"journal":{"name":"Shikizai Kyokaishi","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2005-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85590602","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Masanobu Sagisaka, M. Hino, H. Sakai, M. Abe, A. Yoshizawa
A water/supercritical CO 2 microemulsion (W/scCO 2 μE) with a fluorinated double-tail surfactant bis (1H,1H,2Η,2H-heptadecanuorodecyl)-2-sulfosuccinate (8FS(EO) 2 ) was evaluated in terms of its nanoreactor performance for synthesizing semiconductor ultrafine particles of TiΟ 2 , ZnS, and CdS. By the addition of tetraisopropylorthotitanate (TIP) in W/scCO 2 μE, TiO 2 ultrafine particles were successfully synthesized with a spherical shape and sizes of several tens of nanometers, which were similar to those synthesized in W/cyclohexane μE with a typical hydrocarbon double-tail surfactant AOT. Interestingly, in contrast to the μE system, TiO 2 particle syntheses in liquid-crystal-like (LC-like) surfactant precipitant phase yielded a dendritical morphology of TiO 2 . For metal sulfide synthesis, the addition of metal nitrates as precursors in W/scCO 2 μE was found to lower the maximum W 0 value at which W/scCΟ 2 μE can form, which would result from the promoted aggregation and fusion between reverse micelles, i.e., LC formation. After mixing both the W/scCΟ 2 μEs containing metal nitrate and Na 2 S, metal sulfide ultrafine particles were yielded with spherical shape and sizes of several tens of nanometers. These results suggested that W/scCΟ 2 μE with 8FS (EO) 2 may become a valuable nanoreactor when further investigations reveal size-control techniques for the products.
{"title":"Water/Supercritical CO2 Microemulsions with a Fluorinated Double-tail Surfactant for Syntheses of Semiconductor Ultrafine Particles","authors":"Masanobu Sagisaka, M. Hino, H. Sakai, M. Abe, A. Yoshizawa","doi":"10.4011/SHIKIZAI.81.331","DOIUrl":"https://doi.org/10.4011/SHIKIZAI.81.331","url":null,"abstract":"A water/supercritical CO 2 microemulsion (W/scCO 2 μE) with a fluorinated double-tail surfactant bis (1H,1H,2Η,2H-heptadecanuorodecyl)-2-sulfosuccinate (8FS(EO) 2 ) was evaluated in terms of its nanoreactor performance for synthesizing semiconductor ultrafine particles of TiΟ 2 , ZnS, and CdS. By the addition of tetraisopropylorthotitanate (TIP) in W/scCO 2 μE, TiO 2 ultrafine particles were successfully synthesized with a spherical shape and sizes of several tens of nanometers, which were similar to those synthesized in W/cyclohexane μE with a typical hydrocarbon double-tail surfactant AOT. Interestingly, in contrast to the μE system, TiO 2 particle syntheses in liquid-crystal-like (LC-like) surfactant precipitant phase yielded a dendritical morphology of TiO 2 . For metal sulfide synthesis, the addition of metal nitrates as precursors in W/scCO 2 μE was found to lower the maximum W 0 value at which W/scCΟ 2 μE can form, which would result from the promoted aggregation and fusion between reverse micelles, i.e., LC formation. After mixing both the W/scCΟ 2 μEs containing metal nitrate and Na 2 S, metal sulfide ultrafine particles were yielded with spherical shape and sizes of several tens of nanometers. These results suggested that W/scCΟ 2 μE with 8FS (EO) 2 may become a valuable nanoreactor when further investigations reveal size-control techniques for the products.","PeriodicalId":21870,"journal":{"name":"Shikizai Kyokaishi","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87869493","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：