• Title/Summary/Keyword: Material chemistry

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The Seventeen Plane Groups (Two-dimensional Space Groups)

  • Kim Jin-Gyu;Kim Youn-Joong;Kim Young-Sang;Ko Jaejung;Kang Sang Ook;Han Won-Sik;Suh Il-Hwan
    • Korean Journal of Crystallography
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    • v.16 no.1
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    • pp.11-20
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    • 2005

  • Six basic symmetries and five Bravais lattices existing in the two-dimensional lattice are derived and then ten two-dimensional point groups are classified by each of five Bravais lattices. Finally seventeen two-dimensional space groups belonging to the ten point groups are studied.

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Anisotropic Temperature Factors at Special Positions (특수위치(特殊位置)에서의 비등방성온도인자(比等方性溫度因子))

  • Kim, Young-Sang;Ko, Jae-Jung;Kang, Sang-Ook;Son, Ho-Jin;Son, Ki-Chul;Han, Won-Sik;Suh, Il-Hwan;Kim, Youn-Joong;Kim, Jin-Gyu
    • Korean Journal of Crystallography
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    • v.16 no.2
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    • pp.81-88
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    • 2005

  • The atoms located at a general position in a crystal do thermally ellipsoidal vibration satisfying 1-fold rotation symmetry. Likewise the thermal vibration of atom at special position must comply with the symmetry of the special position. This paper shows how to calculate the anisotropic temperature factors of the atoms located at special positions.

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Adsorption of methyl orange from aqueous solution on anion exchange membranes: Adsorption kinetics and equilibrium

  • Khan, Muhammad Imran;Wu, Liang;Mondal, Abhishek N.;Yao, Zilu;Ge, Liang;Xu, Tongwen
    • Membrane and Water Treatment
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    • v.7 no.1
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    • pp.23-38
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    • 2016

  • Batch adsorption of methyl orange (MO) from aqueous solution using three kinds of anion exchange membranes BI, BIII and DF-120B having different ion exchange capacities (IECs) and water uptakes ($W_R$) was investigated at room temperature. The FTIR spectra of anion exchange membranes was analysed before and after the adsorption of MO dye to investigate the intractions between dye molecules and anion exchange membranes. The effect of various parameters such as contact time, initial dye concentration and molarity of NaCl on the adsorption capacity was studied. The adsorption capacity found to be increased with contact time and initial dye concentration but decreased with ionic strength. The adsorption of MO on BI, BIII and DF-120B followed pseudo-first-order kinetics and the nonlinear forms of Freundlich and Langmuir were used to predict the isotherm parameters. This study demonstrates that anion exchange membranes could be used as useful adsorbents for removal of MO dye from wastewater.

  • https://doi.org/10.12989/mwt.2016.7.1.023 인용 KSCI