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Revisiting the diss...
Revisiting the dissolution of cellulose in H3PO4(aq) through cryo-TEM, PTssNMR and DWS
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- Alves, Luis (författare)
- University of Coimbra
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- Medronho, Bruno (författare)
- Mid Sweden University,Mittuniversitetet,Institutionen för kemiteknik,University of Algarve, Portugal,FSCN
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- Filipe, Alexandra (författare)
- University of Coimbra
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- Romano, Anabela (författare)
- University of Algarve, Portugal
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- Rasteiro, Maria G. (författare)
- University of Coimbra
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- Lindman, Björn (författare)
- Mid Sweden University,Lund University,Lunds universitet,Mittuniversitetet,Institutionen för kemiteknik,FSCN,Fysikalisk kemi,Enheten för fysikalisk och teoretisk kemi,Kemiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Physical Chemistry,Physical and theoretical chemistry,Department of Chemistry,Departments at LTH,Faculty of Engineering, LTH
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- Topgaard, Daniel (författare)
- Lund University,Lunds universitet,Fysikalisk kemi,Enheten för fysikalisk och teoretisk kemi,Kemiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Physical Chemistry,Physical and theoretical chemistry,Department of Chemistry,Departments at LTH,Faculty of Engineering, LTH
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- Davidovich, Irina (författare)
- Technion - Israel Institute of Technology
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- Talmon, Yeshayahu (författare)
- Technion - Israel Institute of Technology
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(creator_code:org_t)
- Elsevier BV, 2021
- 2021
- Engelska.
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Ingår i: Carbohydrate Polymers. - : Elsevier BV. - 0144-8617 .- 1879-1344. ; 252
- Relaterad länk:
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https://www.scienced...
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http://dx.doi.org/10...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://lup.lub.lu.s...
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Abstract
Ämnesord
Stäng
- Cellulose can be dissolved in concentrated acidic aqueous solvents forming extremely viscous solutions, and, in some cases, liquid crystalline phases. In this work, the concentrated phosphoric acid aqueous solvent is revisited implementing a set of advanced techniques, such as cryo-transmission electronic microscopy (cryo-TEM), polarization transfer solid-state nuclear magnetic resonance (PTssNMR), and diffusing wave spectroscopy (DWS). Cryo-TEM images confirm that this solvent system is capable to efficiently dissolve cellulose. No cellulose particles, fibrils, or aggregates are visible. Conversely, PTssNMR revealed a dominant CP signal at 25 °C, characteristic of C-H bond reorientation with correlation time longer than 100 ns and/or order parameter above 0.5, which was ascribed to a transient gel-like network or an anisotropic liquid crystalline phase. Increasing the temperature leads to a gradual transition from CP to INEPT-dominant signal and a loss of birefringence in optical microscopy, suggesting an anisotropic-to-isotropic phase transition. Finally, an excellent agreement between optical microrheology and conventional mechanical rheometry was also obtained.
Ämnesord
- NATURVETENSKAP -- Kemi -- Fysikalisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Physical Chemistry (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Kemiteknik -- Polymerteknologi (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Chemical Engineering -- Polymer Technologies (hsv//eng)
Nyckelord
- Anisotropy
- Cellulose dissolution
- cryo-TEM
- DWS
- Liquid crystalline phase
- Phosphoric acid
- PTssNMR
- Anisotropy
- Cellulose dissolution
- cryo-TEM
- DWS
- Liquid crystalline phase
- Phosphoric acid
- PTssNMR
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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