Cellulose nanofibers vs. cellulose nanocrystals: a comparative study on their influence on the properties of imidazole-doped proton-conducting nanocomposites
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389013%3A_____%2F25%3A00636157" target="_blank" >RIV/61389013:_____/25:00636157 - isvavai.cz</a>
Result on the web
<a href="https://link.springer.com/article/10.1007/s10570-025-06559-y" target="_blank" >https://link.springer.com/article/10.1007/s10570-025-06559-y</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1007/s10570-025-06559-y" target="_blank" >10.1007/s10570-025-06559-y</a>
Alternative languages
Result language
angličtina
Original language name
Cellulose nanofibers vs. cellulose nanocrystals: a comparative study on their influence on the properties of imidazole-doped proton-conducting nanocomposites
Original language description
Nanocellulose-based nanocomposites exhibit properties dependent on nanocellulose morphology, affecting thermal, electrical, and molecular characteristics. The study compares imidazole-doped nanocomposites from cellulose nanofibers (CNFs) and nanocrystals (CNCs). Scanning electron microscopy shows CNFs form entangled networks, while CNCs form compact grains, influencing the imidazole’s interaction within the matrix. CNC-based composites have higher electrical conductivity (0.326 S/m at 150 °C) due to weaker imidazole hydrogen bonds and compact structure, facilitating proton transport. In contrast, CNF-based composites, with a disordered structure and stronger hydrogen bonds between imidazole and polymer matrix, exhibit lower conductivity (0.021 S/m at 140 °C) but enhanced thermal stability, degrading above 220 °C. Solid-state nuclear magnetic resonance (NMR) spectroscopy revealed two imidazole species: slowly and rapidly reorienting and exchanging protons. The activation energy for proton exchange and reorientation of imidazole is lower in the CNC-based composite (0.39 eV) than CNF-based (0.44 eV), indicating weaker hydrogen bonds. The CNF matrix is inhomogeneous, and the imidazole molecules bond in different environments. The wider activation energy distribution in CNF composites supports this conclusion. Heteronuclear correlation (1H-15N HETCOR NMR) spectroscopy identified imidazole bonding to cellulose OH groups and residual water. Proton transport involves imidazole reorientation and exchange via cellulose OH groups and water, contributing to conductivity.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10404 - Polymer science
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Cellulose
ISSN
0969-0239
e-ISSN
1572-882X
Volume of the periodical
32
Issue of the periodical within the volume
8
Country of publishing house
DE - GERMANY
Number of pages
17
Pages from-to
4763-4779
UT code for WoS article
001489300300001
EID of the result in the Scopus database
2-s2.0-105005103376