Journal article 1050 views
Relaxation time of dilute polymer solutions: A microfluidic approach
Francesco Del Giudice 
,
Simon J. Haward,
Amy Q. Shen
,
Simon J. Haward,
Amy Q. Shen
Journal of Rheology, Volume: 61, Issue: 2, Pages: 327 - 337
Swansea University Author:
Francesco Del Giudice
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DOI (Published version): 10.1122/1.4975933
Abstract
Polymer solutions are considered dilute when polymer chains in a solution do not interact with each other. One important step in the characterization of these systems is the measurement of their longest relaxation times λ. For dilute polymer solutions in low-viscous solvents, this measurement can be...
| Published in: | Journal of Rheology |
|---|---|
| ISSN: | 0148-6055 1520-8516 |
| Published: |
Society of Rheology
2017
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa41012 |
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<?xml version="1.0"?><rfc1807><datestamp>2020-09-29T12:24:46.0967901</datestamp><bib-version>v2</bib-version><id>41012</id><entry>2018-07-13</entry><title>Relaxation time of dilute polymer solutions: A microfluidic approach</title><swanseaauthors><author><sid>742d483071479b44d7888e16166b1309</sid><ORCID>0000-0002-9414-6937</ORCID><firstname>Francesco</firstname><surname>Del Giudice</surname><name>Francesco Del Giudice</name><active>true</active><ethesisStudent>false</ethesisStudent></author></swanseaauthors><date>2018-07-13</date><deptcode>CHEG</deptcode><abstract>Polymer solutions are considered dilute when polymer chains in a solution do not interact with each other. One important step in the characterization of these systems is the measurement of their longest relaxation times λ. For dilute polymer solutions in low-viscous solvents, this measurement can be very challenging through conventional techniques. Recently, several microfluidic platforms have been successfully employed to measure the rheological properties of weakly viscoelastic solutions. Nevertheless, a comparison between data generated from different microfluidic platforms has not yet been presented. In this work, we measure λ of dilute polymer solutions for concentrations down to a few parts per million, by using two distinct microfluidic platforms with shear and extensional flow configurations. We consider three representative polymer classes: Neutral polymers in near-theta and good solvents, and a biological polyelectrolyte in a good solvent in the presence of salt. Relaxation times in shear flow λshear are measured through the μ-rheometer based on the viscoelastic alignment of particles in a straight microchannel. Relaxation times in extensional flow λext are measured in a microfluidic optimized cross-slot configuration based on the onset of the flow-induced birefringence. A good agreement between experimental measurements from the two platforms is found. Experimental measures are also compared with available theories.</abstract><type>Journal Article</type><journal>Journal of Rheology</journal><volume>61</volume><journalNumber>2</journalNumber><paginationStart>327</paginationStart><paginationEnd>337</paginationEnd><publisher>Society of Rheology</publisher><issnPrint>0148-6055</issnPrint><issnElectronic>1520-8516</issnElectronic><keywords>Time measurement, Solution polymerization, Polyelectrolytes, Relaxation times, Solvents, Viscosity, Microfluidics, Birefringence, Extensional flows</keywords><publishedDay>31</publishedDay><publishedMonth>3</publishedMonth><publishedYear>2017</publishedYear><publishedDate>2017-03-31</publishedDate><doi>10.1122/1.4975933</doi><url/><notes/><college>COLLEGE NANME</college><department>Chemical Engineering</department><CollegeCode>COLLEGE CODE</CollegeCode><DepartmentCode>CHEG</DepartmentCode><institution>Swansea University</institution><apcterm/><lastEdited>2020-09-29T12:24:46.0967901</lastEdited><Created>2018-07-13T14:44:21.8543139</Created><path><level id="1">Faculty of Science and Engineering</level><level id="2">School of Engineering and Applied Sciences - Chemical Engineering</level></path><authors><author><firstname>Francesco</firstname><surname>Del Giudice</surname><orcid>0000-0002-9414-6937</orcid><order>1</order></author><author><firstname>Simon J.</firstname><surname>Haward</surname><order>2</order></author><author><firstname>Amy Q.</firstname><surname>Shen</surname><order>3</order></author></authors><documents/><OutputDurs/></rfc1807> |
| spelling |
2020-09-29T12:24:46.0967901 v2 41012 2018-07-13 Relaxation time of dilute polymer solutions: A microfluidic approach 742d483071479b44d7888e16166b1309 0000-0002-9414-6937 Francesco Del Giudice Francesco Del Giudice true false 2018-07-13 CHEG Polymer solutions are considered dilute when polymer chains in a solution do not interact with each other. One important step in the characterization of these systems is the measurement of their longest relaxation times λ. For dilute polymer solutions in low-viscous solvents, this measurement can be very challenging through conventional techniques. Recently, several microfluidic platforms have been successfully employed to measure the rheological properties of weakly viscoelastic solutions. Nevertheless, a comparison between data generated from different microfluidic platforms has not yet been presented. In this work, we measure λ of dilute polymer solutions for concentrations down to a few parts per million, by using two distinct microfluidic platforms with shear and extensional flow configurations. We consider three representative polymer classes: Neutral polymers in near-theta and good solvents, and a biological polyelectrolyte in a good solvent in the presence of salt. Relaxation times in shear flow λshear are measured through the μ-rheometer based on the viscoelastic alignment of particles in a straight microchannel. Relaxation times in extensional flow λext are measured in a microfluidic optimized cross-slot configuration based on the onset of the flow-induced birefringence. A good agreement between experimental measurements from the two platforms is found. Experimental measures are also compared with available theories. Journal Article Journal of Rheology 61 2 327 337 Society of Rheology 0148-6055 1520-8516 Time measurement, Solution polymerization, Polyelectrolytes, Relaxation times, Solvents, Viscosity, Microfluidics, Birefringence, Extensional flows 31 3 2017 2017-03-31 10.1122/1.4975933 COLLEGE NANME Chemical Engineering COLLEGE CODE CHEG Swansea University 2020-09-29T12:24:46.0967901 2018-07-13T14:44:21.8543139 Faculty of Science and Engineering School of Engineering and Applied Sciences - Chemical Engineering Francesco Del Giudice 0000-0002-9414-6937 1 Simon J. Haward 2 Amy Q. Shen 3 |
| title |
Relaxation time of dilute polymer solutions: A microfluidic approach |
| spellingShingle |
Relaxation time of dilute polymer solutions: A microfluidic approach Francesco Del Giudice |
| title_short |
Relaxation time of dilute polymer solutions: A microfluidic approach |
| title_full |
Relaxation time of dilute polymer solutions: A microfluidic approach |
| title_fullStr |
Relaxation time of dilute polymer solutions: A microfluidic approach |
| title_full_unstemmed |
Relaxation time of dilute polymer solutions: A microfluidic approach |
| title_sort |
Relaxation time of dilute polymer solutions: A microfluidic approach |
| author_id_str_mv |
742d483071479b44d7888e16166b1309 |
| author_id_fullname_str_mv |
742d483071479b44d7888e16166b1309_***_Francesco Del Giudice |
| author |
Francesco Del Giudice |
| author2 |
Francesco Del Giudice Simon J. Haward Amy Q. Shen |
| format |
Journal article |
| container_title |
Journal of Rheology |
| container_volume |
61 |
| container_issue |
2 |
| container_start_page |
327 |
| publishDate |
2017 |
| institution |
Swansea University |
| issn |
0148-6055 1520-8516 |
| doi_str_mv |
10.1122/1.4975933 |
| publisher |
Society of Rheology |
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Faculty of Science and Engineering |
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facultyofscienceandengineering |
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Faculty of Science and Engineering |
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facultyofscienceandengineering |
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Faculty of Science and Engineering |
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School of Engineering and Applied Sciences - Chemical Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Chemical Engineering |
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0 |
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| description |
Polymer solutions are considered dilute when polymer chains in a solution do not interact with each other. One important step in the characterization of these systems is the measurement of their longest relaxation times λ. For dilute polymer solutions in low-viscous solvents, this measurement can be very challenging through conventional techniques. Recently, several microfluidic platforms have been successfully employed to measure the rheological properties of weakly viscoelastic solutions. Nevertheless, a comparison between data generated from different microfluidic platforms has not yet been presented. In this work, we measure λ of dilute polymer solutions for concentrations down to a few parts per million, by using two distinct microfluidic platforms with shear and extensional flow configurations. We consider three representative polymer classes: Neutral polymers in near-theta and good solvents, and a biological polyelectrolyte in a good solvent in the presence of salt. Relaxation times in shear flow λshear are measured through the μ-rheometer based on the viscoelastic alignment of particles in a straight microchannel. Relaxation times in extensional flow λext are measured in a microfluidic optimized cross-slot configuration based on the onset of the flow-induced birefringence. A good agreement between experimental measurements from the two platforms is found. Experimental measures are also compared with available theories. |
| published_date |
2017-03-31T03:52:16Z |
| _version_ |
1763752580300668928 |
| score |
11.013731 |