Optical birefringence studies of a binary mixture with the nematic–smectic Ad-re-entrant nematic phase sequence
We report the measurements of birefringence as a function of temperature of a binary system 4-cyanophenyl [4'(4''-n-heptylphenyl)]benzoate (7CPB) + 4-cyanophenyl 4-nonylbenzoate (9.CN) showing a nematic-smectic A(d)-re-entrant nematic phase sequence by means of the optical transmissio...
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| Veröffentlicht in: | Journal of physics. Condensed matter 2010-05, Vol.22 (19), p.195106-195106 |
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| container_end_page | 195106 |
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| container_title | Journal of physics. Condensed matter |
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| creator | Prasad, Akhileshwar Das, Malay Kumar |
| description | We report the measurements of birefringence as a function of temperature of a binary system 4-cyanophenyl [4'(4''-n-heptylphenyl)]benzoate (7CPB) + 4-cyanophenyl 4-nonylbenzoate (9.CN) showing a nematic-smectic A(d)-re-entrant nematic phase sequence by means of the optical transmission method. The temperature dependence of the birefringence has been determined from the transmitted intensity data and the orientational order parameters have been calculated. These observations indicate that re-entrant nematic to induced smectic A(d) and induced smectic A(d) to nematic phase transitions for all the mixtures are of second order. There is a continuous change in the Δn values at the nematic-smectic A(d) and smectic A(d)-re-entrant nematic phase transitions. However, for some mixtures a slight increase in birefringence on cooling in the vicinity of the smectic A(d)-re-entrant nematic transition has been observed. We have also fitted our experimental results with those calculated from the modified McMillan theory as proposed by Luckhurst and Timimi. |
| doi_str_mv | 10.1088/0953-8984/22/19/195106 |
| format | Article |
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The temperature dependence of the birefringence has been determined from the transmitted intensity data and the orientational order parameters have been calculated. These observations indicate that re-entrant nematic to induced smectic A(d) and induced smectic A(d) to nematic phase transitions for all the mixtures are of second order. There is a continuous change in the Δn values at the nematic-smectic A(d) and smectic A(d)-re-entrant nematic phase transitions. However, for some mixtures a slight increase in birefringence on cooling in the vicinity of the smectic A(d)-re-entrant nematic transition has been observed. We have also fitted our experimental results with those calculated from the modified McMillan theory as proposed by Luckhurst and Timimi.</description><identifier>ISSN: 0953-8984</identifier><identifier>EISSN: 1361-648X</identifier><identifier>DOI: 10.1088/0953-8984/22/19/195106</identifier><identifier>PMID: 21386450</identifier><identifier>CODEN: JCOMEL</identifier><language>eng</language><publisher>Bristol: IOP Publishing</publisher><subject>Birefringence ; Birefringence (including stress birefringence, flow birefringence, etc.) ; Condensed matter ; Condensed matter: electronic structure, electrical, magnetic, and optical properties ; Condensed matter: structure, mechanical and thermal properties ; Cooling ; Equations of state, phase equilibria, and phase transitions ; Exact sciences and technology ; Liquid Crystals - chemistry ; Mathematical analysis ; Nematic ; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation ; Optical properties of bulk materials and thin films ; Order parameters ; Phase transformations ; Phase Transition ; Physics ; Specific phase transitions ; Temperature dependence ; Transitions in liquid crystals</subject><ispartof>Journal of physics. 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Condensed matter</title><addtitle>J Phys Condens Matter</addtitle><description>We report the measurements of birefringence as a function of temperature of a binary system 4-cyanophenyl [4'(4''-n-heptylphenyl)]benzoate (7CPB) + 4-cyanophenyl 4-nonylbenzoate (9.CN) showing a nematic-smectic A(d)-re-entrant nematic phase sequence by means of the optical transmission method. The temperature dependence of the birefringence has been determined from the transmitted intensity data and the orientational order parameters have been calculated. These observations indicate that re-entrant nematic to induced smectic A(d) and induced smectic A(d) to nematic phase transitions for all the mixtures are of second order. There is a continuous change in the Δn values at the nematic-smectic A(d) and smectic A(d)-re-entrant nematic phase transitions. However, for some mixtures a slight increase in birefringence on cooling in the vicinity of the smectic A(d)-re-entrant nematic transition has been observed. 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Condensed matter</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Prasad, Akhileshwar</au><au>Das, Malay Kumar</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Optical birefringence studies of a binary mixture with the nematic–smectic Ad-re-entrant nematic phase sequence</atitle><jtitle>Journal of physics. Condensed matter</jtitle><addtitle>J Phys Condens Matter</addtitle><date>2010-05-19</date><risdate>2010</risdate><volume>22</volume><issue>19</issue><spage>195106</spage><epage>195106</epage><pages>195106-195106</pages><issn>0953-8984</issn><eissn>1361-648X</eissn><coden>JCOMEL</coden><abstract>We report the measurements of birefringence as a function of temperature of a binary system 4-cyanophenyl [4'(4''-n-heptylphenyl)]benzoate (7CPB) + 4-cyanophenyl 4-nonylbenzoate (9.CN) showing a nematic-smectic A(d)-re-entrant nematic phase sequence by means of the optical transmission method. The temperature dependence of the birefringence has been determined from the transmitted intensity data and the orientational order parameters have been calculated. These observations indicate that re-entrant nematic to induced smectic A(d) and induced smectic A(d) to nematic phase transitions for all the mixtures are of second order. There is a continuous change in the Δn values at the nematic-smectic A(d) and smectic A(d)-re-entrant nematic phase transitions. However, for some mixtures a slight increase in birefringence on cooling in the vicinity of the smectic A(d)-re-entrant nematic transition has been observed. We have also fitted our experimental results with those calculated from the modified McMillan theory as proposed by Luckhurst and Timimi.</abstract><cop>Bristol</cop><pub>IOP Publishing</pub><pmid>21386450</pmid><doi>10.1088/0953-8984/22/19/195106</doi><tpages>1</tpages></addata></record> |
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| subjects | Birefringence Birefringence (including stress birefringence, flow birefringence, etc.) Condensed matter Condensed matter: electronic structure, electrical, magnetic, and optical properties Condensed matter: structure, mechanical and thermal properties Cooling Equations of state, phase equilibria, and phase transitions Exact sciences and technology Liquid Crystals - chemistry Mathematical analysis Nematic Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation Optical properties of bulk materials and thin films Order parameters Phase transformations Phase Transition Physics Specific phase transitions Temperature dependence Transitions in liquid crystals |
| title | Optical birefringence studies of a binary mixture with the nematic–smectic Ad-re-entrant nematic phase sequence |
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