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Dynamic and Static ...
Dynamic and Static Assembly of Sulfated Cellulose Nanocrystals with Alkali Metal Counter Cations
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- Petschacher, P. (author)
- Technische Universität Graz
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- Ghanbari, Reza, 1984 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Sampl, C. (author)
- Technische Universität Graz
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- Wiltsche, H. (author)
- Technische Universität Graz
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- Kádár, Roland, 1982 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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Spirk, Stefan (author)
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- Nypelö, Tiina, 1982 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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(creator_code:org_t)
- 2022-09-09
- 2022
- English.
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In: Nanomaterials. - : MDPI AG. - 2079-4991. ; 12
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Abstract
Subject headings
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- Sulfate groups on cellulose particles such as cellulose nanocrystals (CNCs) provide colloidal stability credit to electrostatic repulsion between the like-charged particles. The introduction of sodium counter cations on the sulfate groups enables drying of the CNC suspensions without irreversible aggregation. Less is known about the effect of other counter cations than sodium on extending the properties of the CNC particles. Here, we introduce the alkali metal counter cations, Li+, Na+, K+, Rb+, and Cs+, on sulfated CNCs without an ion exchange resin, which, so far, has been a common practice. We demonstrate that the facile ion exchange is an efficient method to exchange to any alkali metal cation of sulfate half esters, with exchange rates between 76 and 89%. The ability to form liquid crystalline order in rest was observed by the presence of birefringence patterns and followed the Hofmeister series prediction of a decreasing ability to form anisotropy with an increasing element number. However, we observed the K-CNC rheology and birefringence as a stand-out case within the series of alkali metal modifications, with dynamic moduli and loss tangent indicating a network disruptive effect compared to the other counter cations, whereas observation of the development of birefringence patterns in flow showed the absence of self- or dynamically-assembled liquid crystalline order.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Annan maskinteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Other Mechanical Engineering (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Pappers-, massa- och fiberteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Paper, Pulp and Fiber Technology (hsv//eng)
Keyword
- rheo-PLI
- cellulose nanocrystals
- rheology
- ion exchange
- ion pairs
- birefringence
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Petschacher, P.
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Ghanbari, Reza, ...
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Sampl, C.
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Wiltsche, H.
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Kádár, Roland, 1 ...
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Spirk, Stefan
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show more...
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Nypelö, Tiina, 1 ...
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show less...
- About the subject
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- ENGINEERING AND TECHNOLOGY
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ENGINEERING AND ...
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and Mechanical Engin ...
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and Other Mechanical ...
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- ENGINEERING AND TECHNOLOGY
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ENGINEERING AND ...
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and Materials Engine ...
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and Paper Pulp and F ...
- Articles in the publication
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Nanomaterials
- By the university
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Chalmers University of Technology