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RISS 인기검색어
- 검색키워드
- 저자 : M. Shahul Hameed (검색결과 2 건)
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Shahul Hameed, A.,Nagarathinam, Mangayarkarasi,Reddy, M. V.,Chowdari, B. V. R.,Vittal, Jagadese J. The Royal Society of Chemistry 2012 Journal of materials chemistry Vol.22 No.15
<P>The layer structured α<SUB>I</SUB>-LiVOPO<SUB>4</SUB> was obtained <I>via</I> a two step chemical synthesis. In the first step, a hydrated phase, LiVOPO<SUB>4</SUB>·2H<SUB>2</SUB>O, was obtained by a simple hydrothermal route at 120 °C. Single crystal X-ray diffraction analysis revealed the structure of LiVOPO<SUB>4</SUB>·2H<SUB>2</SUB>O to be orthorhombic with lattice parameters: <I>a</I> = 8.9454(7) Å, <I>b</I> = 9.0406(7) Å and <I>c</I> = 12.7373(10) Å. Dehydration of the parent compound led to its structural transformation to tetragonal α<SUB>I</SUB>-LiVOPO<SUB>4</SUB>, which was only identified previously during the lithium insertion in VOPO<SUB>4</SUB>. We have investigated the solid-state dehydration of LiVOPO<SUB>4</SUB>·2H<SUB>2</SUB>O and proposed a possible mechanism for the crystal structure transformation. Electrochemical characterization of this rarely studied tetragonal phase revealed its good lithium cycling at high operating voltage. Galvanostatic charge–discharge cycling of α<SUB>I</SUB>-LiVOPO<SUB>4</SUB> was studied in a voltage window of 2.5–4.5 V, which shows a stable reversible capacity of 103(±3) mA h g<SUP>−1</SUP> at a current density of 16 mA g<SUP>−1</SUP> (0.1 C). At higher current rates, although it exhibited good cyclability, the capacity was found to decrease with increasing current rates. The long term cycling stability of the above material was demonstrated at a current rate of 0.5 C up to 200 cycles.</P> <P>Graphic Abstract</P><P>Highly reversible lithium insertion and extraction with a good capacity are observed for the rarely studied α<SUB>I</SUB>-LiVOPO<SUB>4</SUB> which was obtained by the thermal dehydration of LiVOPO<SUB>4</SUB>·2H<SUB>2</SUB>O. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2jm00062h'> </P>
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Self-Compacting Concrete Using Marble Sludge Powder and Crushed Rock Dust
M. Shahul Hameed,A. S. S. Sekar,L. Balamurugan,V. Saraswathy 대한토목학회 2012 KSCE JOURNAL OF CIVIL ENGINEERING Vol.16 No.6
Self Compacting Concrete (SCC) has had a remarkable impact on the concrete construction industry, especially the precast concrete industry. Crushed Rock Dust (CRD) and Marble Sludge Powder (MSP) are discarded in the nearby land and the natural fertility of the soil is spoiled. MSP and CRD can be used as filler and helps to reduce the total voids content in concrete. Consequently, this contributes to improve the strength of concrete. An experimental investigation has been carried out to study the combined effect of addition of MSP and CRD on the strength and durability of SCC. The study on physical, chemical and mechanical properties such as compressive strength and split tensile strength and the durability tests include water absorption test, water permeability, rapid chloride permeability; electrical resistivity and half cell potential are carried out in this study. From the results it is confirmed that compressive strength increases with increase in percentage replacement of MSP up to 15% of CRD in place of FA. It is found that split tensile strength is directly proportional to the compressive strength. The highest electrical resistivity values were obtained for Normal Concrete with 100% CRD and significant increase in resistivity values for SCC. Self Compacting Concrete (SCC) has had a remarkable impact on the concrete construction industry, especially the precast concrete industry. Crushed Rock Dust (CRD) and Marble Sludge Powder (MSP) are discarded in the nearby land and the natural fertility of the soil is spoiled. MSP and CRD can be used as filler and helps to reduce the total voids content in concrete. Consequently, this contributes to improve the strength of concrete. An experimental investigation has been carried out to study the combined effect of addition of MSP and CRD on the strength and durability of SCC. The study on physical, chemical and mechanical properties such as compressive strength and split tensile strength and the durability tests include water absorption test, water permeability, rapid chloride permeability; electrical resistivity and half cell potential are carried out in this study. From the results it is confirmed that compressive strength increases with increase in percentage replacement of MSP up to 15% of CRD in place of FA. It is found that split tensile strength is directly proportional to the compressive strength. The highest electrical resistivity values were obtained for Normal Concrete with 100% CRD and significant increase in resistivity values for SCC.
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