Watching cellulose grow – Kinetic investigations on cellulose thin film formation at the gas–solid interface using a quartz crystal microbalance with dissipation (QCM-D)

[Display omitted] ► The reaction of trimethylsilyl cellulose thin films with HCl vapor is studied. ► QCM-D allows an in situ monitoring of this reaction under ambient atmosphere. ► Rate constants for this reaction have been determined. ► The reaction proceeds via a first fast phase and a second slow...

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Bibliographic Details
Published in:Colloids and surfaces. A, Physicochemical and engineering aspects Physicochemical and engineering aspects, 2012-04, Vol.400, p.67-72
Main Authors: Mohan, Tamilselvan, Spirk, Stefan, Kargl, Rupert, Doliška, Aleš, Ehmann, Heike M.A., Köstler, Stefan, Ribitsch, Volker, Stana-Kleinschek, Karin
Format: Article
Language:English
Subjects:
Cellulose
Cellulose model films
Concentration (composition)
Dissipation
Hydrolysis
Interface reaction
Kinetics
Microorganisms
Quartz crystal microbalance
Reaction kinetics
Thin films
Trimethylsilyl cellulose
Vapor phases
Wettability
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Summary:[Display omitted] ► The reaction of trimethylsilyl cellulose thin films with HCl vapor is studied. ► QCM-D allows an in situ monitoring of this reaction under ambient atmosphere. ► Rate constants for this reaction have been determined. ► The reaction proceeds via a first fast phase and a second slower phase. ► The formed cellulose films show a layer thickness of 23nm. The conversion of trimethylsilyl cellulose (TMSC) to cellulose films via acid vapor hydrolysis is investigated at the gas solid interface in situ, in real time and under ambient conditions using the QCM-D technique. For this purpose, a permanent flow of gaseous HCl is employed which reacts with TMSC spun on QCM sensors to form cellulose films. The kinetics behind this reaction is elucidated and reveals first order. This desilylation reaction proceeds via a fast first phase (k=3.01×10−3s−1) and a second slower phase (k=6.29×10−5s−1) where less accessible silyl groups are cleaved off. Besides kinetics, film thicknesses have been determined using the QCM method. Moreover, the influence of the acid concentration on the kinetics and layer thickness was studied. A comparison between the materials synthesized in the QCM chamber with those obtained by classical vapor phase hydrolysis does not show any differences in the surface characteristics and composition as proven by X-ray photoelectron spectroscopy, atomic force microscopy, and wettability studies.
ISSN:0927-7757
1873-4359
DOI:10.1016/j.colsurfa.2012.02.053