Imperial College London
Alternate

ProfessorDarylWilliams

Faculty of Engineering, Department of Chemical Engineering

Professor of Particle Science
 
 
 
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Contact

 

+44 (0)20 7594 5611d.r.williams Website

 
 
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Location

 

439ACE ExtensionSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Kondor:2021:10.3389/fceng.2021.738995,
author = {Kondor, A and Santmarti, A and Mautner, A and Williams, D and Bismarck, A and Lee, K-Y},
doi = {10.3389/fceng.2021.738995},
journal = {Frontiers in Chemical Engineering},
pages = {1--12},
title = {On the BET surface area of nanocellulose determined using volumetric, gravimetric and chromatographic adsorption methods},
url = {http://dx.doi.org/10.3389/fceng.2021.738995},
volume = {3},
year = {2021}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Volumetric N2 adsorption at –196 °C is generally accepted as “gold standard” for estimating the Brunauer-Emmet-Teller (BET) surface area of nanocellulose. It is unclear however, whether the BET surface area of nanocellulose obtained at such low temperatures and pressures is meaningful at an absolute sense, as nanocellulose is used at ambient temperature and pressure. In this work, a systematic evaluation of the BET surface area of nanocellulose using a highly crystalline bacterial cellulose (BC) as model nanocellulose was undertaken to achieve a comprehensive understanding of the limitations of BET method for nanocellulose. BET surface area obtained using volumetric N2 adsorption at –196 °C was compared with the BET surface area acquired from gravimetric experiments using n-octane adsorption measured using dynamic vapour sorption (DVS) and n-octane adsorption determined by inverse gas chromatography (iGC), both at 25 °C. It was found that the BET surface area calculated from volumetric N2 adsorption data was 25% lower than that of n-octane adsorption at 25 °C obtained using DVS and iGC adsorption methods. These results supported the hypothesis that the BET surface area of nanocellulose is both a molecular scale (N2 vs n-octane, molecular cross section of 0.162 nm2 vs 0.646 nm2) and temperature (–196 °C vs 25 °C) dependent property. This study also demonstrates the importance of selecting appropriate BET pressure range based on established criteria and would suggest that the room temperature gravimetric measurement is more relevant for many nanocellulose applications.
AU  - Kondor,A
AU  - Santmarti,A
AU  - Mautner,A
AU  - Williams,D
AU  - Bismarck,A
AU  - Lee,K-Y
DO  - 10.3389/fceng.2021.738995
EP  - 12
PY  - 2021///
SN  - 2673-2718
SP  - 1
TI  - On the BET surface area of nanocellulose determined using volumetric, gravimetric and chromatographic adsorption methods
T2  - Frontiers in Chemical Engineering
UR  - http://dx.doi.org/10.3389/fceng.2021.738995
UR  - https://www.frontiersin.org/articles/10.3389/fceng.2021.738995/full
UR  - http://hdl.handle.net/10044/1/91309
VL  - 3
ER  -
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