Effect of cadmium arachidate on molecular packing of zinc arachidate LB multilayers
DSpace at IIT Bombay
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Title |
Effect of cadmium arachidate on molecular packing of zinc arachidate LB multilayers
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Creator |
NAYAK, PK
TALWAR, SS MAJOR, SS SRINIVASA, RS |
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Subject |
zinc compounds
cadmium compounds fourier transform infrared spectroscopy monolayers |
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Description |
Mixed zinc arachidate–cadmium arachidate (ZnA–CdA) LB multilayers deposited from varying subphase compositions have been characterized by FTIR and X-ray reflection (XR). The COO− symmetric stretching band of CdA and changes in CH2 scissoring band were used to monitor the CdA content and nature of molecular packing in the mixed multilayers. The XR pattern of pure ZnA multilayer with bilayer period of not, vert, similar47 Å corresponds to a rotator phase like ‘loose packing’ in a hexagonal layer cell. However, the presence of low concentrations of cadmium ion in subphase (2–5 mol%) results in biphasic multilayers with bilayer periods of not, vert, similar47 and not, vert, similar51 Å. In the cadmium concentration range of 10–25 mol%, the multilayers exhibit sharp (0 0 l) peaks in XR pattern, corresponding to a single layered structure with alkyl chains tilted by not, vert, similar23° from layer-normal. Increase in the cadmium concentration (30–50 mol%) results in biphasic multilayers with bilayer periods of not, vert, similar52 and not, vert, similar55 Å, the later corresponding to a herringbone type packing of alkyl chains, perpendicular to the layer plane. At higher concentrations of CdA, the layered structure and molecular packing resemble that of pure CdA multilayer.
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Publisher |
Elsevier
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Date |
2009-03-18T09:10:48Z
2011-11-25T19:20:17Z 2011-12-26T13:07:25Z 2011-12-27T05:55:27Z 2009-03-18T09:10:48Z 2011-11-25T19:20:17Z 2011-12-26T13:07:25Z 2011-12-27T05:55:27Z 2006 |
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Type |
Article
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Identifier |
Colloids and Surfaces A: Physicochemical and Engineering Aspects 284-285, 187-191
0927-7757 http://dx.doi.org/10.1016/j.colsurfa.2005.10.046 http://hdl.handle.net/10054/968 http://dspace.library.iitb.ac.in/xmlui/handle/10054/968 |
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Language |
en
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