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dc.contributor.authorNAYAK, PKen_US
dc.contributor.authorSINGH, Sen_US
dc.contributor.authorTALWAR, SSen_US
dc.contributor.authorSRINIVASA, RSen_US
dc.contributor.authorMAJOR, SSen_US
dc.date.accessioned2009-03-18T09:10:20Zen_US
dc.date.accessioned2011-11-25T19:19:16Zen_US
dc.date.accessioned2011-12-26T13:07:30Zen_US
dc.date.accessioned2011-12-27T05:55:32Z
dc.date.available2009-03-18T09:10:20Zen_US
dc.date.available2011-11-25T19:19:16Zen_US
dc.date.available2011-12-26T13:07:30Zen_US
dc.date.available2011-12-27T05:55:32Z
dc.date.issued2006en_US
dc.identifier.citationColloids and Surfaces A: Physicochemical and Engineering Aspects 284-285, 192-197en_US
dc.identifier.issn0927-7757en_US
dc.identifier.urihttp://dx.doi.org/10.1016/j.colsurfa.2005.10.074en_US
dc.identifier.urihttp://hdl.handle.net/10054/965en_US
dc.identifier.urihttp://dspace.library.iitb.ac.in/xmlui/handle/10054/965en_US
dc.description.abstractZinc 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.isoenen_US
dc.publisherElsevieren_US
dc.subjectFourier Transform Infrared Spectroscopyen_US
dc.subjectMultilayeren_US
dc.subjectZinc Compoundsen_US
dc.subjectPh Effectsen_US
dc.titleDependence of the structure of zinc arachidate LB multilayers on subphase zinc ion concentration and pHen_US
dc.typeArticleen_US
dc.description.copyright© Elsevieren_US


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