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Relaxation time of polyelectrolyte solutions: When μ-rheometry steps in charge

Francesco Del Giudice Orcid Logo, Vincenzo Calcagno, Valeria Esposito Taliento, Francesco Greco, Paolo Antonio Netti, Pier Luca Maffettone

Journal of Rheology, Volume: 61, Issue: 1, Pages: 13 - 21

Swansea University Author: Francesco Del Giudice Orcid Logo

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DOI (Published version): 10.1122/1.4965930

Abstract

Measuring the longest relaxation time of a viscoelastic liquid is an important step in its rheological characterization. In several instances, however, such measurement is unfeasible through conventional techniques, e.g., frequency response in linear viscoelasticity or measure of first normal stress...

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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/cronfa41011
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spelling 2018-08-31T12:23:37.4012413 v2 41011 2018-07-13 Relaxation time of polyelectrolyte solutions: When μ-rheometry steps in charge 742d483071479b44d7888e16166b1309 0000-0002-9414-6937 Francesco Del Giudice Francesco Del Giudice true false 2018-07-13 CHEG Measuring the longest relaxation time of a viscoelastic liquid is an important step in its rheological characterization. In several instances, however, such measurement is unfeasible through conventional techniques, e.g., frequency response in linear viscoelasticity or measure of first normal stress difference. This difficulty is often found for very dilute macromolecular solutions. The case of polyelectrolyte solutions is especially important for their relevance in several bioengineering problems: Even theoretical predictions for this case can often not be tested in the absence of an experimental characterization. In this work, we succeed in measuring the relaxation time of two dilute/semidilute polyelectrolyte solutions as a function of added salt concentration. The relaxation time is measured through a novel microrheometrical technique based on the viscoelasticity-induced alignment of particles suspended in a microfluidic channel. We apply such technique to characterize two polyelectrolyte solutions, namely, hyaluronic acid and chitosan solutions. Relaxation times as small as ≈ 60 μs are detected, which are otherwise unmeasurable when using both conventional or other μ-rheometrical techniques. Journal Article Journal of Rheology 61 1 13 21 Society of Rheology 0148-6055 1520-8516 Time measurement, Shear rate dependent viscosity, Solution polymerization, Polyelectrolytes, Relaxation times, Solvents, Viscosity, Microfluidics, Viscoelasticity 31 12 2017 2017-12-31 10.1122/1.4965930 COLLEGE NANME Chemical Engineering COLLEGE CODE CHEG Swansea University 2018-08-31T12:23:37.4012413 2018-07-13T14:43:53.8052030 Faculty of Science and Engineering School of Engineering and Applied Sciences - Chemical Engineering Francesco Del Giudice 0000-0002-9414-6937 1 Vincenzo Calcagno 2 Valeria Esposito Taliento 3 Francesco Greco 4 Paolo Antonio Netti 5 Pier Luca Maffettone 6
title Relaxation time of polyelectrolyte solutions: When μ-rheometry steps in charge
spellingShingle Relaxation time of polyelectrolyte solutions: When μ-rheometry steps in charge
Francesco Del Giudice
title_short Relaxation time of polyelectrolyte solutions: When μ-rheometry steps in charge
title_full Relaxation time of polyelectrolyte solutions: When μ-rheometry steps in charge
title_fullStr Relaxation time of polyelectrolyte solutions: When μ-rheometry steps in charge
title_full_unstemmed Relaxation time of polyelectrolyte solutions: When μ-rheometry steps in charge
title_sort Relaxation time of polyelectrolyte solutions: When μ-rheometry steps in charge
author_id_str_mv 742d483071479b44d7888e16166b1309
author_id_fullname_str_mv 742d483071479b44d7888e16166b1309_***_Francesco Del Giudice
author Francesco Del Giudice
author2 Francesco Del Giudice
Vincenzo Calcagno
Valeria Esposito Taliento
Francesco Greco
Paolo Antonio Netti
Pier Luca Maffettone
format Journal article
container_title Journal of Rheology
container_volume 61
container_issue 1
container_start_page 13
publishDate 2017
institution Swansea University
issn 0148-6055
1520-8516
doi_str_mv 10.1122/1.4965930
publisher Society of Rheology
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Chemical Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Chemical Engineering
document_store_str 0
active_str 0
description Measuring the longest relaxation time of a viscoelastic liquid is an important step in its rheological characterization. In several instances, however, such measurement is unfeasible through conventional techniques, e.g., frequency response in linear viscoelasticity or measure of first normal stress difference. This difficulty is often found for very dilute macromolecular solutions. The case of polyelectrolyte solutions is especially important for their relevance in several bioengineering problems: Even theoretical predictions for this case can often not be tested in the absence of an experimental characterization. In this work, we succeed in measuring the relaxation time of two dilute/semidilute polyelectrolyte solutions as a function of added salt concentration. The relaxation time is measured through a novel microrheometrical technique based on the viscoelasticity-induced alignment of particles suspended in a microfluidic channel. We apply such technique to characterize two polyelectrolyte solutions, namely, hyaluronic acid and chitosan solutions. Relaxation times as small as ≈ 60 μs are detected, which are otherwise unmeasurable when using both conventional or other μ-rheometrical techniques.
published_date 2017-12-31T03:52:16Z
_version_ 1763752580171694080
score 10.9517765

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