期刊
CELLULOSE
卷 21, 期 6, 页码 4209-4218出版社
SPRINGER
DOI: 10.1007/s10570-014-0426-9
关键词
Cellulose nanocrystals; Reducing end; Thiolation; Chemisorption
资金
- Academy of Finland through its Centres of Excellence Programme [2014-2019, 132723612 HYBER]
Cellulose nanocrystals (CNC) were functionalized in aqueous media at the reducing, aldehyde ends of cellulose. CNC oxidation to produce carboxyl groups was followed by carbodiimide-mediated reaction to install thiol groups. The selectivity and extent of thiolation at the reducing ends was qualitatively confirmed by imaging (transmission electron microscopy) silver nanoparticles that tagged the CNC termini and by X-ray photoelectron spectroscopy, respectively. The adsorption of thiolated CNC onto gold surfaces as well as the viscoelastic property of the formed adlayer was investigated by using quartz crystal microgravimetry. The thiolated CNC chemisorbed on the surfaces were further analyzed for surface density and distribution by using atomic force microscopy. Overall we introduce a facile, mild asymmetric thiolation procedure as an efficient alternative to conventional reductive amination.
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