Magnetic alignment study of rare-earth-containing liquid crystals.
Identifieur interne : 001477 ( Main/Exploration ); précédent : 001476; suivant : 001478Magnetic alignment study of rare-earth-containing liquid crystals.
Auteurs : Yury G. Galyametdinov [Russie] ; Wolfgang Haase ; Bart Goderis ; Dries Moors ; Kris Driesen ; Rik Van Deun ; Koen BinnemansSource :
- The journal of physical chemistry. B [ 1520-6106 ] ; 2007.
Abstract
The liquid-crystalline rare-earth complexes of the type [Ln(LH)3(DOS)3]-where Ln is Tb, Dy, Ho, Er, Tm, or Yb; LH is the Schiff base N-octadecyl-4-tetradecyloxysalicylaldimine; and DOS is dodecylsulfate-exhibit a smectic A phase. Because of the presence of rare-earth ions with a large magnetic anisotropy, the smectic A phase of these liquid crystals can be easier aligned in an external magnetic field than smectic A phases of conventional liquid crystals. The magnetic anisotropy of the [Ln(LH)3(DOS)3] complexes was determined by measurement of the temperature-dependence of the magnetic susceptibility using a Faraday balance. The highest value for the magnetic anisotropy was found for the dysprosium(III) complex. The magnetic alignment of these liquid crystals was studied by time-resolved synchrotron small-angle X-ray scattering experiments. Depending on the sign of the magnetic anisotropy, the director of the liquid-crystalline molecules was aligned parallel or perpendicular to the magnetic field lines. A positive value of the magnetic anisotropy (and parallel alignment) was found for the thulium(III) and the ytterbium(III) complexes, whereas a negative value of the magnetic anisotropy (and perpendicular alignment) was observed for the terbium(III) and dysprosium(III) complexes.
DOI: 10.1021/jp0771724
PubMed: 18044875
Affiliations:
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Galyametdinov</name><affiliation wicri:level="1"><nlm:affiliation>Physical and Colloid Chemistry Department, Kazan State Technological University, Karl Marx Street 68, 420015 Kazan, Russia. yugal2002@mail.ru</nlm:affiliation><country xml:lang="fr">Russie</country><wicri:regionArea>Physical and Colloid Chemistry Department, Kazan State Technological University, Karl Marx Street 68, 420015 Kazan</wicri:regionArea><wicri:noRegion>420015 Kazan</wicri:noRegion></affiliation></author><author><name sortKey="Haase, Wolfgang" sort="Haase, Wolfgang" uniqKey="Haase W" first="Wolfgang" last="Haase">Wolfgang Haase</name></author><author><name sortKey="Goderis, Bart" sort="Goderis, Bart" uniqKey="Goderis B" first="Bart" last="Goderis">Bart Goderis</name></author><author><name sortKey="Moors, Dries" sort="Moors, Dries" uniqKey="Moors D" first="Dries" last="Moors">Dries Moors</name></author><author><name sortKey="Driesen, Kris" sort="Driesen, Kris" uniqKey="Driesen K" first="Kris" last="Driesen">Kris Driesen</name></author><author><name sortKey="Van Deun, Rik" sort="Van Deun, Rik" uniqKey="Van Deun R" first="Rik" last="Van Deun">Rik Van Deun</name></author><author><name sortKey="Binnemans, Koen" sort="Binnemans, Koen" uniqKey="Binnemans K" first="Koen" last="Binnemans">Koen Binnemans</name></author></titleStmt><publicationStmt><idno type="wicri:source">PubMed</idno><date when="2007">2007</date><idno type="doi">10.1021/jp0771724</idno><idno type="RBID">pubmed:18044875</idno><idno type="pmid">18044875</idno><idno type="wicri:Area/PubMed/Corpus">000607</idno><idno type="wicri:explorRef" wicri:stream="PubMed" wicri:step="Corpus" wicri:corpus="PubMed">000607</idno><idno type="wicri:Area/PubMed/Curation">000607</idno><idno type="wicri:explorRef" wicri:stream="PubMed" wicri:step="Curation">000607</idno><idno type="wicri:Area/PubMed/Checkpoint">000607</idno><idno type="wicri:explorRef" wicri:stream="Checkpoint" wicri:step="PubMed">000607</idno><idno type="wicri:Area/Ncbi/Merge">000202</idno><idno type="wicri:Area/Ncbi/Curation">000202</idno><idno type="wicri:Area/Ncbi/Checkpoint">000202</idno><idno type="wicri:doubleKey">1520-6106:2007:Galyametdinov Y:magnetic:alignment:study</idno><idno type="wicri:Area/Main/Merge">001522</idno><idno type="wicri:Area/Main/Curation">001477</idno><idno type="wicri:Area/Main/Exploration">001477</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en">Magnetic alignment study of rare-earth-containing liquid crystals.</title><author><name sortKey="Galyametdinov, Yury G" sort="Galyametdinov, Yury G" uniqKey="Galyametdinov Y" first="Yury G" last="Galyametdinov">Yury G. Galyametdinov</name><affiliation wicri:level="1"><nlm:affiliation>Physical and Colloid Chemistry Department, Kazan State Technological University, Karl Marx Street 68, 420015 Kazan, Russia. yugal2002@mail.ru</nlm:affiliation><country xml:lang="fr">Russie</country><wicri:regionArea>Physical and Colloid Chemistry Department, Kazan State Technological University, Karl Marx Street 68, 420015 Kazan</wicri:regionArea><wicri:noRegion>420015 Kazan</wicri:noRegion></affiliation></author><author><name sortKey="Haase, Wolfgang" sort="Haase, Wolfgang" uniqKey="Haase W" first="Wolfgang" last="Haase">Wolfgang Haase</name></author><author><name sortKey="Goderis, Bart" sort="Goderis, Bart" uniqKey="Goderis B" first="Bart" last="Goderis">Bart Goderis</name></author><author><name sortKey="Moors, Dries" sort="Moors, Dries" uniqKey="Moors D" first="Dries" last="Moors">Dries Moors</name></author><author><name sortKey="Driesen, Kris" sort="Driesen, Kris" uniqKey="Driesen K" first="Kris" last="Driesen">Kris Driesen</name></author><author><name sortKey="Van Deun, Rik" sort="Van Deun, Rik" uniqKey="Van Deun R" first="Rik" last="Van Deun">Rik Van Deun</name></author><author><name sortKey="Binnemans, Koen" sort="Binnemans, Koen" uniqKey="Binnemans K" first="Koen" last="Binnemans">Koen Binnemans</name></author></analytic><series><title level="j">The journal of physical chemistry. B</title><idno type="ISSN">1520-6106</idno><imprint><date when="2007" type="published">2007</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The liquid-crystalline rare-earth complexes of the type [Ln(LH)3(DOS)3]-where Ln is Tb, Dy, Ho, Er, Tm, or Yb; LH is the Schiff base N-octadecyl-4-tetradecyloxysalicylaldimine; and DOS is dodecylsulfate-exhibit a smectic A phase. Because of the presence of rare-earth ions with a large magnetic anisotropy, the smectic A phase of these liquid crystals can be easier aligned in an external magnetic field than smectic A phases of conventional liquid crystals. The magnetic anisotropy of the [Ln(LH)3(DOS)3] complexes was determined by measurement of the temperature-dependence of the magnetic susceptibility using a Faraday balance. The highest value for the magnetic anisotropy was found for the dysprosium(III) complex. The magnetic alignment of these liquid crystals was studied by time-resolved synchrotron small-angle X-ray scattering experiments. Depending on the sign of the magnetic anisotropy, the director of the liquid-crystalline molecules was aligned parallel or perpendicular to the magnetic field lines. A positive value of the magnetic anisotropy (and parallel alignment) was found for the thulium(III) and the ytterbium(III) complexes, whereas a negative value of the magnetic anisotropy (and perpendicular alignment) was observed for the terbium(III) and dysprosium(III) complexes.</div></front></TEI><affiliations><list><country><li>Russie</li></country></list><tree><noCountry><name sortKey="Binnemans, Koen" sort="Binnemans, Koen" uniqKey="Binnemans K" first="Koen" last="Binnemans">Koen Binnemans</name><name sortKey="Driesen, Kris" sort="Driesen, Kris" uniqKey="Driesen K" first="Kris" last="Driesen">Kris Driesen</name><name sortKey="Goderis, Bart" sort="Goderis, Bart" uniqKey="Goderis B" first="Bart" last="Goderis">Bart Goderis</name><name sortKey="Haase, Wolfgang" sort="Haase, Wolfgang" uniqKey="Haase W" first="Wolfgang" last="Haase">Wolfgang Haase</name><name sortKey="Moors, Dries" sort="Moors, Dries" uniqKey="Moors D" first="Dries" last="Moors">Dries Moors</name><name sortKey="Van Deun, Rik" sort="Van Deun, Rik" uniqKey="Van Deun R" first="Rik" last="Van Deun">Rik Van Deun</name></noCountry><country name="Russie"><noRegion><name sortKey="Galyametdinov, Yury G" sort="Galyametdinov, Yury G" uniqKey="Galyametdinov Y" first="Yury G" last="Galyametdinov">Yury G. 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