Boundary layer viscosity of CNT-doped liquid crystals: effects of phase behavior
Carbon nanotube (CNT)-doped liquid crystals (LCs) have attracted intensive research studies as prospective materials in optic display devices, microfluidic sensors, and lubricants due to their unique molecular structures and properties. In this paper, the interaction between the doped CNTs and the h...
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| Veröffentlicht in: | Rheologica acta 2013-11, Vol.52 (10-12), p.939-947 |
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| creator | Qiao, Xiaoxi Zhang, Xiangjun Guo, Yanbao Yang, Shikuan Tian, Yu Meng, Yonggang |
| description | Carbon nanotube (CNT)-doped liquid crystals (LCs) have attracted intensive research studies as prospective materials in optic display devices, microfluidic sensors, and lubricants due to their unique molecular structures and properties. In this paper, the interaction between the doped CNTs and the hosting 4-cyano-4
′
-pentylbiphenyl (5CB) molecules (in both nematic and isotropic phases) was investigated and we focused on the boundary layer rheological properties of the CNT-doped 5CB under external electric field. The experiments were performed by using a quartz crystal microbalance (for boundary layer viscosity investigation) and a rheometer (for bulk viscosity measurement). The results indicate that the bulk viscosity of the CNT-doped 5CB presents an obvious electroviscous effect in its nematic phase while no electroviscous effect in its isotropic phase. Additionally, we found that the boundary layer viscosity of the CNT-doped 5CB demonstrated significant electroviscous effects both in its nematic phase and isotropic phase. The enhanced electroviscous effects on the boundary layer viscosity of CNT-doped 5CB can be attributed to the highly ordered structures of LC molecules and CNTs on the substrate under external electric field. The unique properties of the boundary layer rheology of CNT-doped 5CB LC were further discussed in view of the ordering of LC molecules induced by the electric field, the polarity of CNTs, and the aligning interaction between CNTs and LC molecules. |
| doi_str_mv | 10.1007/s00397-013-0732-4 |
| format | Article |
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′
-pentylbiphenyl (5CB) molecules (in both nematic and isotropic phases) was investigated and we focused on the boundary layer rheological properties of the CNT-doped 5CB under external electric field. The experiments were performed by using a quartz crystal microbalance (for boundary layer viscosity investigation) and a rheometer (for bulk viscosity measurement). The results indicate that the bulk viscosity of the CNT-doped 5CB presents an obvious electroviscous effect in its nematic phase while no electroviscous effect in its isotropic phase. Additionally, we found that the boundary layer viscosity of the CNT-doped 5CB demonstrated significant electroviscous effects both in its nematic phase and isotropic phase. The enhanced electroviscous effects on the boundary layer viscosity of CNT-doped 5CB can be attributed to the highly ordered structures of LC molecules and CNTs on the substrate under external electric field. The unique properties of the boundary layer rheology of CNT-doped 5CB LC were further discussed in view of the ordering of LC molecules induced by the electric field, the polarity of CNTs, and the aligning interaction between CNTs and LC molecules.</description><identifier>ISSN: 0035-4511</identifier><identifier>EISSN: 1435-1528</identifier><identifier>DOI: 10.1007/s00397-013-0732-4</identifier><language>eng</language><publisher>Berlin/Heidelberg: Springer Berlin Heidelberg</publisher><subject>Boundary layers ; Carbon nanotubes ; Characterization and Evaluation of Materials ; Chemistry and Materials Science ; Complex Fluids and Microfluidics ; Display devices ; Electric fields ; Food Science ; Liquid crystals ; Materials Science ; Mechanical Engineering ; Microbalances ; Microfluidics ; Original Contribution ; Polarity ; Polymer Sciences ; Properties (attributes) ; Quartz crystals ; Rheological properties ; Rheology ; Soft and Granular Matter ; Substrates ; Viscosity ; Viscosity measurement</subject><ispartof>Rheologica acta, 2013-11, Vol.52 (10-12), p.939-947</ispartof><rights>Springer-Verlag Berlin Heidelberg 2013</rights><rights>Rheologica Acta is a copyright of Springer, (2013). All Rights Reserved.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c316t-5cb874040c7c33ff4a7fae526fc8342cfb8e7e4e6ed469a25383002f3ac7f4e23</citedby><cites>FETCH-LOGICAL-c316t-5cb874040c7c33ff4a7fae526fc8342cfb8e7e4e6ed469a25383002f3ac7f4e23</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://link.springer.com/content/pdf/10.1007/s00397-013-0732-4$$EPDF$$P50$$Gspringer$$H</linktopdf><linktohtml>$$Uhttps://link.springer.com/10.1007/s00397-013-0732-4$$EHTML$$P50$$Gspringer$$H</linktohtml><link.rule.ids>315,781,785,27926,27927,41490,42559,51321</link.rule.ids></links><search><creatorcontrib>Qiao, Xiaoxi</creatorcontrib><creatorcontrib>Zhang, Xiangjun</creatorcontrib><creatorcontrib>Guo, Yanbao</creatorcontrib><creatorcontrib>Yang, Shikuan</creatorcontrib><creatorcontrib>Tian, Yu</creatorcontrib><creatorcontrib>Meng, Yonggang</creatorcontrib><title>Boundary layer viscosity of CNT-doped liquid crystals: effects of phase behavior</title><title>Rheologica acta</title><addtitle>Rheol Acta</addtitle><description>Carbon nanotube (CNT)-doped liquid crystals (LCs) have attracted intensive research studies as prospective materials in optic display devices, microfluidic sensors, and lubricants due to their unique molecular structures and properties. In this paper, the interaction between the doped CNTs and the hosting 4-cyano-4
′
-pentylbiphenyl (5CB) molecules (in both nematic and isotropic phases) was investigated and we focused on the boundary layer rheological properties of the CNT-doped 5CB under external electric field. The experiments were performed by using a quartz crystal microbalance (for boundary layer viscosity investigation) and a rheometer (for bulk viscosity measurement). The results indicate that the bulk viscosity of the CNT-doped 5CB presents an obvious electroviscous effect in its nematic phase while no electroviscous effect in its isotropic phase. Additionally, we found that the boundary layer viscosity of the CNT-doped 5CB demonstrated significant electroviscous effects both in its nematic phase and isotropic phase. The enhanced electroviscous effects on the boundary layer viscosity of CNT-doped 5CB can be attributed to the highly ordered structures of LC molecules and CNTs on the substrate under external electric field. The unique properties of the boundary layer rheology of CNT-doped 5CB LC were further discussed in view of the ordering of LC molecules induced by the electric field, the polarity of CNTs, and the aligning interaction between CNTs and LC molecules.</description><subject>Boundary layers</subject><subject>Carbon nanotubes</subject><subject>Characterization and Evaluation of Materials</subject><subject>Chemistry and Materials Science</subject><subject>Complex Fluids and Microfluidics</subject><subject>Display devices</subject><subject>Electric fields</subject><subject>Food Science</subject><subject>Liquid crystals</subject><subject>Materials Science</subject><subject>Mechanical Engineering</subject><subject>Microbalances</subject><subject>Microfluidics</subject><subject>Original Contribution</subject><subject>Polarity</subject><subject>Polymer Sciences</subject><subject>Properties (attributes)</subject><subject>Quartz crystals</subject><subject>Rheological properties</subject><subject>Rheology</subject><subject>Soft and Granular Matter</subject><subject>Substrates</subject><subject>Viscosity</subject><subject>Viscosity measurement</subject><issn>0035-4511</issn><issn>1435-1528</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2013</creationdate><recordtype>article</recordtype><sourceid>AFKRA</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><recordid>eNp1kMtOwzAQRS0EEqXwAewssTaMH4lTdlDxkipgUdaW64xpqlKndoqUv8dRkFixmsWce0dzCLnkcM0B9E0CkDPNgEsGWgqmjsiEK1kwXojqmEzyumCq4PyUnKW0AeC61GJC3u_DYVfb2NOt7THS7ya5kJqup8HT-euS1aHFmm6b_aGpqYt96uw23VL0Hl2XBqpd24R0hWv73YR4Tk58JvDid07Jx-PDcv7MFm9PL_O7BXOSlx0r3KrSChQ47aT0XlntLRai9K6SSji_qlCjwhJrVc6sKGQlAYSX1mmvUMgpuRp72xj2B0yd2YRD3OWTRohSZCdQDhQfKRdDShG9aWPzld81HMwgzoziTBZnBnFG5YwYMymzu0-Mf83_h34A3M9wYQ</recordid><startdate>20131101</startdate><enddate>20131101</enddate><creator>Qiao, Xiaoxi</creator><creator>Zhang, Xiangjun</creator><creator>Guo, Yanbao</creator><creator>Yang, Shikuan</creator><creator>Tian, Yu</creator><creator>Meng, Yonggang</creator><general>Springer Berlin Heidelberg</general><general>Springer Nature B.V</general><scope>AAYXX</scope><scope>CITATION</scope><scope>8FE</scope><scope>8FG</scope><scope>ABJCF</scope><scope>AFKRA</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>D1I</scope><scope>DWQXO</scope><scope>HCIFZ</scope><scope>KB.</scope><scope>L6V</scope><scope>M7S</scope><scope>PDBOC</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>PTHSS</scope></search><sort><creationdate>20131101</creationdate><title>Boundary layer viscosity of CNT-doped liquid crystals: effects of phase behavior</title><author>Qiao, Xiaoxi ; Zhang, Xiangjun ; Guo, Yanbao ; Yang, Shikuan ; Tian, Yu ; Meng, Yonggang</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c316t-5cb874040c7c33ff4a7fae526fc8342cfb8e7e4e6ed469a25383002f3ac7f4e23</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2013</creationdate><topic>Boundary layers</topic><topic>Carbon nanotubes</topic><topic>Characterization and Evaluation of Materials</topic><topic>Chemistry and Materials Science</topic><topic>Complex Fluids and Microfluidics</topic><topic>Display devices</topic><topic>Electric fields</topic><topic>Food Science</topic><topic>Liquid crystals</topic><topic>Materials Science</topic><topic>Mechanical Engineering</topic><topic>Microbalances</topic><topic>Microfluidics</topic><topic>Original Contribution</topic><topic>Polarity</topic><topic>Polymer Sciences</topic><topic>Properties (attributes)</topic><topic>Quartz crystals</topic><topic>Rheological properties</topic><topic>Rheology</topic><topic>Soft and Granular Matter</topic><topic>Substrates</topic><topic>Viscosity</topic><topic>Viscosity measurement</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Qiao, Xiaoxi</creatorcontrib><creatorcontrib>Zhang, Xiangjun</creatorcontrib><creatorcontrib>Guo, Yanbao</creatorcontrib><creatorcontrib>Yang, Shikuan</creatorcontrib><creatorcontrib>Tian, Yu</creatorcontrib><creatorcontrib>Meng, Yonggang</creatorcontrib><collection>CrossRef</collection><collection>ProQuest SciTech Collection</collection><collection>ProQuest Technology Collection</collection><collection>Materials Science & Engineering Collection</collection><collection>ProQuest Central UK/Ireland</collection><collection>ProQuest Central</collection><collection>Technology Collection</collection><collection>ProQuest One Community College</collection><collection>ProQuest Materials Science Collection</collection><collection>ProQuest Central</collection><collection>SciTech Premium Collection</collection><collection>https://resources.nclive.org/materials</collection><collection>ProQuest Engineering Collection</collection><collection>Engineering Database</collection><collection>Materials science collection</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>ProQuest Central China</collection><collection>Engineering collection</collection><jtitle>Rheologica acta</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Qiao, Xiaoxi</au><au>Zhang, Xiangjun</au><au>Guo, Yanbao</au><au>Yang, Shikuan</au><au>Tian, Yu</au><au>Meng, Yonggang</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Boundary layer viscosity of CNT-doped liquid crystals: effects of phase behavior</atitle><jtitle>Rheologica acta</jtitle><stitle>Rheol Acta</stitle><date>2013-11-01</date><risdate>2013</risdate><volume>52</volume><issue>10-12</issue><spage>939</spage><epage>947</epage><pages>939-947</pages><issn>0035-4511</issn><eissn>1435-1528</eissn><abstract>Carbon nanotube (CNT)-doped liquid crystals (LCs) have attracted intensive research studies as prospective materials in optic display devices, microfluidic sensors, and lubricants due to their unique molecular structures and properties. In this paper, the interaction between the doped CNTs and the hosting 4-cyano-4
′
-pentylbiphenyl (5CB) molecules (in both nematic and isotropic phases) was investigated and we focused on the boundary layer rheological properties of the CNT-doped 5CB under external electric field. The experiments were performed by using a quartz crystal microbalance (for boundary layer viscosity investigation) and a rheometer (for bulk viscosity measurement). The results indicate that the bulk viscosity of the CNT-doped 5CB presents an obvious electroviscous effect in its nematic phase while no electroviscous effect in its isotropic phase. Additionally, we found that the boundary layer viscosity of the CNT-doped 5CB demonstrated significant electroviscous effects both in its nematic phase and isotropic phase. The enhanced electroviscous effects on the boundary layer viscosity of CNT-doped 5CB can be attributed to the highly ordered structures of LC molecules and CNTs on the substrate under external electric field. The unique properties of the boundary layer rheology of CNT-doped 5CB LC were further discussed in view of the ordering of LC molecules induced by the electric field, the polarity of CNTs, and the aligning interaction between CNTs and LC molecules.</abstract><cop>Berlin/Heidelberg</cop><pub>Springer Berlin Heidelberg</pub><doi>10.1007/s00397-013-0732-4</doi><tpages>9</tpages></addata></record> |
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| subjects | Boundary layers Carbon nanotubes Characterization and Evaluation of Materials Chemistry and Materials Science Complex Fluids and Microfluidics Display devices Electric fields Food Science Liquid crystals Materials Science Mechanical Engineering Microbalances Microfluidics Original Contribution Polarity Polymer Sciences Properties (attributes) Quartz crystals Rheological properties Rheology Soft and Granular Matter Substrates Viscosity Viscosity measurement |
| title | Boundary layer viscosity of CNT-doped liquid crystals: effects of phase behavior |
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