Hydrothermal Syntheses of Colloidal Carbon Spheres from Cyclodextrins
Colloidal carbon spheres have been prepared from aqueous alpha-, beta-, and gamma-cyclodextrin (CD) solutions in closed systems under hydrothermal conditions at 160 oC. Both liquid and solid-state 13C NMR spectra taken for samples at different reaction times have been used to monitor the dehydration and carbonization pathways. CD slowly hydrolyzes to glucose and forms 5-hydroxymethyl furfural (HMF) followed by carbonization into colloidal carbon spheres. The isolated carbon spheres are 70-150 nm in diameter, exhibit a core-shell structure, and are comprised of a condensed core (C=C) peppered with resident chemical functionalities including carboxylate and hydroxyl groups. Evidence from 13C solid-state NMR and FT-IR spectra reveal that the evolving carbon spheres show a gradual increase in the amount of aromatic carbon as a function of reaction time and that the carbon spheres generated from gamma-CD contain significantly higher aromatic carbon than those derived from alpha- and beta-CD.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 946653
- Report Number(s):
- PNNL-SA-59363; 13500; KC0201050; TRN: US200903%%447
- Journal Information:
- Journal of Physical Chemistry C, 112(37):14236-14240, Vol. 112, Issue 37
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
77 NANOSCIENCE AND NANOTECHNOLOGY
CARBON
MICROSPHERES
COLLOIDS
DEXTRIN
HYDROTHERMAL SYNTHESIS
CHEMICAL REACTION KINETICS
CARBONIZATION
DEHYDRATION
NANOSTRUCTURES
cyclodextrin
hydrothermal
carbon sphere
hydrolysis
dehydration
Environmental Molecular Sciences Laboratory