Dependence of the structure of zinc arachidate LB multilayers on subphase zinc ion concentration and pH

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Dependence of the structure of zinc arachidate LB multilayers on subphase zinc ion concentration and pH

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dc.contributor.author NAYAK, PK en_US
dc.contributor.author SINGH, S en_US
dc.contributor.author TALWAR, SS en_US
dc.contributor.author SRINIVASA, RS en_US
dc.contributor.author MAJOR, SS en_US
dc.date.accessioned 2009-03-18T09:10:20Z en_US
dc.date.accessioned 2011-11-25T19:19:16Z en_US
dc.date.accessioned 2011-12-26T13:07:30Z en_US
dc.date.accessioned 2011-12-27T05:55:32Z
dc.date.available 2009-03-18T09:10:20Z en_US
dc.date.available 2011-11-25T19:19:16Z en_US
dc.date.available 2011-12-26T13:07:30Z en_US
dc.date.available 2011-12-27T05:55:32Z
dc.date.issued 2006 en_US
dc.identifier.citation Colloids and Surfaces A: Physicochemical and Engineering Aspects 284-285, 192-197 en_US
dc.identifier.issn 0927-7757 en_US
dc.identifier.uri http://dx.doi.org/10.1016/j.colsurfa.2005.10.074 en_US
dc.identifier.uri http://hdl.handle.net/10054/965 en_US
dc.identifier.uri http://dspace.library.iitb.ac.in/xmlui/handle/10054/965 en_US
dc.description.abstract Zinc arachidate (ZnA) multilayers transferred at different subphase pH and zinc ion concentrations in subphase are studied by X-ray reflection (XR) and FTIR studies. In this range of process parameters, the multilayers showed the presence of several phases, which were often coexistent. The observed phases were characterized by bilayer periods of ~56 Å (α),~52 Å (β),~51 Å (γ) and ~47 Å (δ). Although these polymorphic phases were observed at all the concentrations studied, pH windows over which the phases were observed, varied with concentration of zinc ions in the subphase. At lower end of zinc concentration, multilayers with single δ-phase could be obtained in the range of pH 6.6–7.1, but under most other conditions, the multilayers were found to be bi-phasic. Similar behavior was observed in the mid-range of zinc concentrations. However, at higher zinc ion concentrations, pure δ-phase could be deposited only in a narrow pH range of 6.2–6.3. Interestingly, in the pH range of 7.4–7.6, multilayers with pure α-phase could be deposited. FTIR spectra of all the multilayers showed overlapping singlet and doublet features corresponding to CH2 scissoring band, indicating the presence of sub-cell packing of alkyl chains with both one and two molecules per unit cells. Thermal stability studies show that the δ-phase is the most stable phase of ZnA and melts at ~140 °C. The α-phase melts at relatively lower temperature (~110 °C). However, both β and γ phases undergo a gradual phase transition to δ-phase at ~130 °C. en_US
dc.language.iso en en_US
dc.publisher Elsevier en_US
dc.subject fourier transform infrared spectroscopy en_US
dc.subject multilayer en_US
dc.subject zinc compounds en_US
dc.subject ph effects en_US
dc.title Dependence of the structure of zinc arachidate LB multilayers on subphase zinc ion concentration and pH en_US
dc.type Article en_US
dc.description.copyright © Elsevier en_US


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