Electro-thermal tuning in a negative dielectric cholesteric liquid crystal material
The thermal and electrical tunability of a cholesteric liquid crystal containing a negative dielectric anisotropy liquid crystal in a planar alignment was studied. The physical, optical, and electro-optical characteristics of mixtures containing different ratios of chiral dopant S811 and the negativ...
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| Veröffentlicht in: | Journal of applied physics 2008-05, Vol.103 (9), p.093107-093107-6 |
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| container_end_page | 093107-6 |
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| container_issue | 9 |
| container_start_page | 093107 |
| container_title | Journal of applied physics |
| container_volume | 103 |
| creator | Natarajan, Lalgudi V. Wofford, Jeremy M. Tondiglia, Vincent P. Sutherland, Richard L. Koerner, Hilmar Vaia, Richard A. Bunning, Timothy J. |
| description | The thermal and electrical tunability of a cholesteric liquid crystal containing a negative dielectric anisotropy liquid crystal in a planar alignment was studied. The physical, optical, and electro-optical characteristics of mixtures containing different ratios of chiral dopant S811 and the negative dielectric anisotropy liquid crystal ZLI-2806 were examined. A smectic A phase was seen at room temperature for S811 loadings
>
20
wt
%
. Below 20%, a room temperature cholesteric phase was observed. Upon heating mixtures with composition S811
>
20
%
, the selective reflection notch of the cholesteric phase appeared and blueshifted with temperature. Thermal tuning from
2300
to
500
nm
was observed over the temperature range of
23
-
55
°
C
. Polarized optical microscopy, differential scanning calorimetry, and x-ray studies were utilized to confirm the temperature-dependent phase behavior. Tuning of
∼
50
nm
by the application of a direct current electric field was also observed with no onset of electrohydrodynamic instabilities for voltages up to
∼
300
V
. Bandwidth broadening but not tuning was obtained with the application of alternating current fields. Electrical tuning is likely due to pitch contraction brought about through the annealing of defects. |
| doi_str_mv | 10.1063/1.2913326 |
| format | Article |
| fullrecord | <record><control><sourceid>scitation_osti_</sourceid><recordid>TN_cdi_osti_scitechconnect_959698</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>jap</sourcerecordid><originalsourceid>FETCH-LOGICAL-c376t-37ea988a51a5b71fd9f9b176512adfeaadd34bb8dfd6e61579321f8fad75d07b3</originalsourceid><addsrcrecordid>eNp1kE1LAzEQhoMoWKsH_8F69LA1szFfF0FK_YCCB_UcsvloI9usJqngv3fX7tXTDMMzLzMPQpeAF4AZuYFFI4GQhh2hGWAha04pPkYzjBuoheTyFJ3l_IExgCByhl5XnTMl9XXZurTTXVX2McRNFWKlq-g2uoRvV9ng_rBgKrPtO5eLG_sufO2DrUz6yWVY3elxrLtzdOJ1l93FVOfo_WH1tnyq1y-Pz8v7dW0IZ6Um3GkphKagacvBW-llC5xRaLT1TmtryW3bCustcwwol6QBL7y2nFrMWzJHV4fcPpegsgnFma3pYxxOVZJKJsXAXB8Yk_qck_PqM4WdTj8KsBqNKVCTsYG9O7Bj1PB4H_-HJ21q0qZGbeQXQxN0-A</addsrcrecordid><sourcetype>Open Access Repository</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype></control><display><type>article</type><title>Electro-thermal tuning in a negative dielectric cholesteric liquid crystal material</title><source>AIP Journals Complete</source><source>AIP Digital Archive</source><source>Alma/SFX Local Collection</source><creator>Natarajan, Lalgudi V. ; Wofford, Jeremy M. ; Tondiglia, Vincent P. ; Sutherland, Richard L. ; Koerner, Hilmar ; Vaia, Richard A. ; Bunning, Timothy J.</creator><creatorcontrib>Natarajan, Lalgudi V. ; Wofford, Jeremy M. ; Tondiglia, Vincent P. ; Sutherland, Richard L. ; Koerner, Hilmar ; Vaia, Richard A. ; Bunning, Timothy J. ; Brookhaven National Laboratory (BNL) National Synchrotron Light Source</creatorcontrib><description>The thermal and electrical tunability of a cholesteric liquid crystal containing a negative dielectric anisotropy liquid crystal in a planar alignment was studied. The physical, optical, and electro-optical characteristics of mixtures containing different ratios of chiral dopant S811 and the negative dielectric anisotropy liquid crystal ZLI-2806 were examined. A smectic A phase was seen at room temperature for S811 loadings
>
20
wt
%
. Below 20%, a room temperature cholesteric phase was observed. Upon heating mixtures with composition S811
>
20
%
, the selective reflection notch of the cholesteric phase appeared and blueshifted with temperature. Thermal tuning from
2300
to
500
nm
was observed over the temperature range of
23
-
55
°
C
. Polarized optical microscopy, differential scanning calorimetry, and x-ray studies were utilized to confirm the temperature-dependent phase behavior. Tuning of
∼
50
nm
by the application of a direct current electric field was also observed with no onset of electrohydrodynamic instabilities for voltages up to
∼
300
V
. Bandwidth broadening but not tuning was obtained with the application of alternating current fields. Electrical tuning is likely due to pitch contraction brought about through the annealing of defects.</description><identifier>ISSN: 0021-8979</identifier><identifier>EISSN: 1089-7550</identifier><identifier>DOI: 10.1063/1.2913326</identifier><identifier>CODEN: JAPIAU</identifier><language>eng</language><publisher>United States: American Institute of Physics</publisher><subject>ALIGNMENT ; ALTERNATING CURRENT ; ANISOTROPY ; ANNEALING ; CALORIMETRY ; CONTRACTION ; DEFECTS ; DIELECTRIC MATERIALS ; DIRECT CURRENT ; ELECTRIC FIELDS ; ELECTROHYDRODYNAMICS ; HEATING ; LIQUID CRYSTALS ; MATERIALS SCIENCE ; MIXTURES ; national synchrotron light source ; OPTICAL MICROSCOPY ; REFLECTION ; TUNING</subject><ispartof>Journal of applied physics, 2008-05, Vol.103 (9), p.093107-093107-6</ispartof><rights>2008 American Institute of Physics</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c376t-37ea988a51a5b71fd9f9b176512adfeaadd34bb8dfd6e61579321f8fad75d07b3</citedby><cites>FETCH-LOGICAL-c376t-37ea988a51a5b71fd9f9b176512adfeaadd34bb8dfd6e61579321f8fad75d07b3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://pubs.aip.org/jap/article-lookup/doi/10.1063/1.2913326$$EHTML$$P50$$Gscitation$$H</linktohtml><link.rule.ids>230,315,781,785,795,886,1560,4513,27929,27930,76389,76395</link.rule.ids><backlink>$$Uhttps://www.osti.gov/biblio/959698$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>Natarajan, Lalgudi V.</creatorcontrib><creatorcontrib>Wofford, Jeremy M.</creatorcontrib><creatorcontrib>Tondiglia, Vincent P.</creatorcontrib><creatorcontrib>Sutherland, Richard L.</creatorcontrib><creatorcontrib>Koerner, Hilmar</creatorcontrib><creatorcontrib>Vaia, Richard A.</creatorcontrib><creatorcontrib>Bunning, Timothy J.</creatorcontrib><creatorcontrib>Brookhaven National Laboratory (BNL) National Synchrotron Light Source</creatorcontrib><title>Electro-thermal tuning in a negative dielectric cholesteric liquid crystal material</title><title>Journal of applied physics</title><description>The thermal and electrical tunability of a cholesteric liquid crystal containing a negative dielectric anisotropy liquid crystal in a planar alignment was studied. The physical, optical, and electro-optical characteristics of mixtures containing different ratios of chiral dopant S811 and the negative dielectric anisotropy liquid crystal ZLI-2806 were examined. A smectic A phase was seen at room temperature for S811 loadings
>
20
wt
%
. Below 20%, a room temperature cholesteric phase was observed. Upon heating mixtures with composition S811
>
20
%
, the selective reflection notch of the cholesteric phase appeared and blueshifted with temperature. Thermal tuning from
2300
to
500
nm
was observed over the temperature range of
23
-
55
°
C
. Polarized optical microscopy, differential scanning calorimetry, and x-ray studies were utilized to confirm the temperature-dependent phase behavior. Tuning of
∼
50
nm
by the application of a direct current electric field was also observed with no onset of electrohydrodynamic instabilities for voltages up to
∼
300
V
. Bandwidth broadening but not tuning was obtained with the application of alternating current fields. Electrical tuning is likely due to pitch contraction brought about through the annealing of defects.</description><subject>ALIGNMENT</subject><subject>ALTERNATING CURRENT</subject><subject>ANISOTROPY</subject><subject>ANNEALING</subject><subject>CALORIMETRY</subject><subject>CONTRACTION</subject><subject>DEFECTS</subject><subject>DIELECTRIC MATERIALS</subject><subject>DIRECT CURRENT</subject><subject>ELECTRIC FIELDS</subject><subject>ELECTROHYDRODYNAMICS</subject><subject>HEATING</subject><subject>LIQUID CRYSTALS</subject><subject>MATERIALS SCIENCE</subject><subject>MIXTURES</subject><subject>national synchrotron light source</subject><subject>OPTICAL MICROSCOPY</subject><subject>REFLECTION</subject><subject>TUNING</subject><issn>0021-8979</issn><issn>1089-7550</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2008</creationdate><recordtype>article</recordtype><recordid>eNp1kE1LAzEQhoMoWKsH_8F69LA1szFfF0FK_YCCB_UcsvloI9usJqngv3fX7tXTDMMzLzMPQpeAF4AZuYFFI4GQhh2hGWAha04pPkYzjBuoheTyFJ3l_IExgCByhl5XnTMl9XXZurTTXVX2McRNFWKlq-g2uoRvV9ng_rBgKrPtO5eLG_sufO2DrUz6yWVY3elxrLtzdOJ1l93FVOfo_WH1tnyq1y-Pz8v7dW0IZ6Um3GkphKagacvBW-llC5xRaLT1TmtryW3bCustcwwol6QBL7y2nFrMWzJHV4fcPpegsgnFma3pYxxOVZJKJsXAXB8Yk_qck_PqM4WdTj8KsBqNKVCTsYG9O7Bj1PB4H_-HJ21q0qZGbeQXQxN0-A</recordid><startdate>20080501</startdate><enddate>20080501</enddate><creator>Natarajan, Lalgudi V.</creator><creator>Wofford, Jeremy M.</creator><creator>Tondiglia, Vincent P.</creator><creator>Sutherland, Richard L.</creator><creator>Koerner, Hilmar</creator><creator>Vaia, Richard A.</creator><creator>Bunning, Timothy J.</creator><general>American Institute of Physics</general><scope>AAYXX</scope><scope>CITATION</scope><scope>OTOTI</scope></search><sort><creationdate>20080501</creationdate><title>Electro-thermal tuning in a negative dielectric cholesteric liquid crystal material</title><author>Natarajan, Lalgudi V. ; Wofford, Jeremy M. ; Tondiglia, Vincent P. ; Sutherland, Richard L. ; Koerner, Hilmar ; Vaia, Richard A. ; Bunning, Timothy J.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c376t-37ea988a51a5b71fd9f9b176512adfeaadd34bb8dfd6e61579321f8fad75d07b3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2008</creationdate><topic>ALIGNMENT</topic><topic>ALTERNATING CURRENT</topic><topic>ANISOTROPY</topic><topic>ANNEALING</topic><topic>CALORIMETRY</topic><topic>CONTRACTION</topic><topic>DEFECTS</topic><topic>DIELECTRIC MATERIALS</topic><topic>DIRECT CURRENT</topic><topic>ELECTRIC FIELDS</topic><topic>ELECTROHYDRODYNAMICS</topic><topic>HEATING</topic><topic>LIQUID CRYSTALS</topic><topic>MATERIALS SCIENCE</topic><topic>MIXTURES</topic><topic>national synchrotron light source</topic><topic>OPTICAL MICROSCOPY</topic><topic>REFLECTION</topic><topic>TUNING</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Natarajan, Lalgudi V.</creatorcontrib><creatorcontrib>Wofford, Jeremy M.</creatorcontrib><creatorcontrib>Tondiglia, Vincent P.</creatorcontrib><creatorcontrib>Sutherland, Richard L.</creatorcontrib><creatorcontrib>Koerner, Hilmar</creatorcontrib><creatorcontrib>Vaia, Richard A.</creatorcontrib><creatorcontrib>Bunning, Timothy J.</creatorcontrib><creatorcontrib>Brookhaven National Laboratory (BNL) National Synchrotron Light Source</creatorcontrib><collection>CrossRef</collection><collection>OSTI.GOV</collection><jtitle>Journal of applied physics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Natarajan, Lalgudi V.</au><au>Wofford, Jeremy M.</au><au>Tondiglia, Vincent P.</au><au>Sutherland, Richard L.</au><au>Koerner, Hilmar</au><au>Vaia, Richard A.</au><au>Bunning, Timothy J.</au><aucorp>Brookhaven National Laboratory (BNL) National Synchrotron Light Source</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Electro-thermal tuning in a negative dielectric cholesteric liquid crystal material</atitle><jtitle>Journal of applied physics</jtitle><date>2008-05-01</date><risdate>2008</risdate><volume>103</volume><issue>9</issue><spage>093107</spage><epage>093107-6</epage><pages>093107-093107-6</pages><issn>0021-8979</issn><eissn>1089-7550</eissn><coden>JAPIAU</coden><abstract>The thermal and electrical tunability of a cholesteric liquid crystal containing a negative dielectric anisotropy liquid crystal in a planar alignment was studied. The physical, optical, and electro-optical characteristics of mixtures containing different ratios of chiral dopant S811 and the negative dielectric anisotropy liquid crystal ZLI-2806 were examined. A smectic A phase was seen at room temperature for S811 loadings
>
20
wt
%
. Below 20%, a room temperature cholesteric phase was observed. Upon heating mixtures with composition S811
>
20
%
, the selective reflection notch of the cholesteric phase appeared and blueshifted with temperature. Thermal tuning from
2300
to
500
nm
was observed over the temperature range of
23
-
55
°
C
. Polarized optical microscopy, differential scanning calorimetry, and x-ray studies were utilized to confirm the temperature-dependent phase behavior. Tuning of
∼
50
nm
by the application of a direct current electric field was also observed with no onset of electrohydrodynamic instabilities for voltages up to
∼
300
V
. Bandwidth broadening but not tuning was obtained with the application of alternating current fields. Electrical tuning is likely due to pitch contraction brought about through the annealing of defects.</abstract><cop>United States</cop><pub>American Institute of Physics</pub><doi>10.1063/1.2913326</doi></addata></record> |
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| identifier | ISSN: 0021-8979 |
| ispartof | Journal of applied physics, 2008-05, Vol.103 (9), p.093107-093107-6 |
| issn | 0021-8979 1089-7550 |
| language | eng |
| recordid | cdi_osti_scitechconnect_959698 |
| source | AIP Journals Complete; AIP Digital Archive; Alma/SFX Local Collection |
| subjects | ALIGNMENT ALTERNATING CURRENT ANISOTROPY ANNEALING CALORIMETRY CONTRACTION DEFECTS DIELECTRIC MATERIALS DIRECT CURRENT ELECTRIC FIELDS ELECTROHYDRODYNAMICS HEATING LIQUID CRYSTALS MATERIALS SCIENCE MIXTURES national synchrotron light source OPTICAL MICROSCOPY REFLECTION TUNING |
| title | Electro-thermal tuning in a negative dielectric cholesteric liquid crystal material |
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