Magnetic alignment study of rare-earth-containing liquid crystals.
Identifieur interne : 000607 ( PubMed/Curation ); précédent : 000606; suivant : 000608Magnetic 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
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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></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></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></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><pubmed><MedlineCitation Owner="NLM" Status="PubMed-not-MEDLINE"><PMID Version="1">18044875</PMID><DateCreated><Year>2007</Year><Month>12</Month><Day>13</Day></DateCreated><DateCompleted><Year>2008</Year><Month>02</Month><Day>01</Day></DateCompleted><Article PubModel="Print-Electronic"><Journal><ISSN IssnType="Print">1520-6106</ISSN><JournalIssue CitedMedium="Print"><Volume>111</Volume><Issue>50</Issue><PubDate><Year>2007</Year><Month>Dec</Month><Day>20</Day></PubDate></JournalIssue><Title>The journal of physical chemistry. B</Title><ISOAbbreviation>J Phys Chem B</ISOAbbreviation></Journal><ArticleTitle>Magnetic alignment study of rare-earth-containing liquid crystals.</ArticleTitle><Pagination><MedlinePgn>13881-5</MedlinePgn></Pagination><Abstract><AbstractText>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.</AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Galyametdinov</LastName><ForeName>Yury G</ForeName><Initials>YG</Initials><AffiliationInfo><Affiliation>Physical and Colloid Chemistry Department, Kazan State Technological University, Karl Marx Street 68, 420015 Kazan, Russia. yugal2002@mail.ru</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Haase</LastName><ForeName>Wolfgang</ForeName><Initials>W</Initials></Author><Author ValidYN="Y"><LastName>Goderis</LastName><ForeName>Bart</ForeName><Initials>B</Initials></Author><Author ValidYN="Y"><LastName>Moors</LastName><ForeName>Dries</ForeName><Initials>D</Initials></Author><Author ValidYN="Y"><LastName>Driesen</LastName><ForeName>Kris</ForeName><Initials>K</Initials></Author><Author ValidYN="Y"><LastName>Van Deun</LastName><ForeName>Rik</ForeName><Initials>R</Initials></Author><Author ValidYN="Y"><LastName>Binnemans</LastName><ForeName>Koen</ForeName><Initials>K</Initials></Author></AuthorList><Language>eng</Language><PublicationTypeList><PublicationType UI="D016428">Journal Article</PublicationType></PublicationTypeList><ArticleDate DateType="Electronic"><Year>2007</Year><Month>11</Month><Day>29</Day></ArticleDate></Article><MedlineJournalInfo><Country>United States</Country><MedlineTA>J Phys Chem B</MedlineTA><NlmUniqueID>101157530</NlmUniqueID><ISSNLinking>1520-5207</ISSNLinking></MedlineJournalInfo></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="aheadofprint"><Year>2007</Year><Month>11</Month><Day>29</Day></PubMedPubDate><PubMedPubDate PubStatus="pubmed"><Year>2007</Year><Month>11</Month><Day>30</Day><Hour>9</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>2007</Year><Month>11</Month><Day>30</Day><Hour>9</Hour><Minute>1</Minute></PubMedPubDate><PubMedPubDate PubStatus="entrez"><Year>2007</Year><Month>11</Month><Day>30</Day><Hour>9</Hour><Minute>0</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="doi">10.1021/jp0771724</ArticleId><ArticleId IdType="pubmed">18044875</ArticleId></ArticleIdList></PubmedData></pubmed></record>Pour manipuler ce document sous Unix (Dilib)
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