Hydrophobic precipitation of carbonaceous spheres from fructose by a hydrothermal process

Zhang, Mu; Yang, Hong; Liu, Yinong; Sun, Xudong; Zhang, Dongke; Xue, Dongfeng

doi:10.1016/j.carbon.2012.01.024

Cited by 99 publications

(64 citation statements)

References 21 publications

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“…The morphologies of the products changed with different dehydration temperatures because the dehydration temperatures determined the carbonized degrees of the CNSs, and the structural changes were affected by carbonized degrees. (4) Finally the tiny particles were aggregated to form CNSs by LaMer model that involved subsequent continuous growth by molecular attachment [7] or hydrophobic precipitation of carbonaceous spheres [8]. Under different dehydration temperatures, the carbonized extent and structural differences resulted in the aggregation and morphology changes of the products.…”

Section: Resultsmentioning

confidence: 99%

“…During the process of exploring the formation mechanism of the CNSs, we found that, neither Lamer [7] model which involved an outburst nucleation and subsequent continuous growth by molecular attachment nor hydrophobic precipitation of carbonaceous spheres [8], they all have a common point of view that these CNSs are gathered together by the tiny carbon particles, which recently refer to luminescent carbonaceous dots (CDs) with the diameter below 10 nm. The luminescent CDs have aroused widespread concern due to its chemical stability and low toxicity while compared to the traditional semiconductor quantum dots [9].…”

Section: Introductionmentioning

confidence: 99%

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A simple route to prepare carbonaceous nanospheres from bagasse

et al. 2013

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A simple route to prepare carbonaceous nanospheres from bagasse

et al. 2013

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“…The peaks near 1509 and 780 cm -1 are characteristic of the C=C stretching vibration and the unsubstituted CH=CH of the furan ring, respectively (Chuntanapum and Matsumura. 2009;Zhang et al 2012;Alakhras and Holze 2007). The peak located around 1200 cm -1 was associated with the the dimethylene ether bridges and/or -CO stretching of the benzene nucleus (-CH2OCH2-) Choi et al 2002).…”

Section: Insoluble Matter and Ft-ir Analysismentioning

confidence: 99%

Investigation of a New Natural Particleboard Adhesive Composed of Tannin and Sucrose. 2. Effect of Pressing Temperature and Time on Board Properties, and Characterization of Adhesive

Zhao¹,

Umemura²

2015

BioResources

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In a previous study by the authors, particleboard was manufactured using a new natural adhesive composed of tannin and sucrose. The optimal ratio between tannin and sucrose was 25/75, and the suitable resin content was 30 to 40 wt%. In this study, the effects of hot pressing temperature and hot pressing time on board properties were investigated. The optimal values for the hot pressing temperature and hot pressing time were found to be 220 °C and 10 min, respectively. When the particleboard was made under these optimum conditions, the physical properties of the particleboard bonded with tannin and sucrose met the requirement of the JIS A 5908 type 18 standard (2003). Thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), insoluble matter, and Fourier transform infrared spectroscopy (FT-IR) tests were carried out. The results of TGA and DSC measurements showed that the weight loss and endothermic reaction of the adhesive composed of tannin and sucrose at a ratio of 25/75 occurred at 204 and 215 °C, respectively. When the adhesive was heated at 220 °C for longer than 10 min, the level of insoluble matter was higher than 70 wt%. FT-IR analysis showed the existence of a furan ring, a carbonyl group, and dimethylene ether bridges in the cured adhesives before and after the boiling treatment. When the heating time was longer than 10 min, no further change of chemical structure was observed.

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“…The hydrothermal carbonization mechanism was illustrated by Sevilla, Titirici, and Xue et al 42,50,53 During hydrothermal treatment at 473 K, the glucose transforms into a series of water-soluble substances (WSS) and partly watersoluble substances (PWSS), mainly furan derivatives, which undergo complex chemical reactions and form polyfuranic intermediates. 29,42,50,54 TEM and SEM research on HTC spheres has shown that the nano-size spheres spread all over the surface of the HTC spheres, 53,55 and it has been inferred that the nano-size primary polyfuranic particle is the intermediate. 53 Considering that the nano-size primary polyfuranic particle is derived from WSS or PWSS in water solution, abundant hydrophilic groups must be reserved on the surface to maintain the low interfacial tension in the solution, similar to water-soluble Nano carbon dots prepared under the same experimental condition.…”

Section: Possible Formation Mechanism Of Mhtcl On Cfsmentioning

confidence: 99%

A multiscale hydrothermal carbon layer modified carbon fiber for composite fabrication

Chen

Wang

et al. 2018

RSC Adv.

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A novel multiscale hydrothermal carbon layer (MHTCL) for carbon fiber (CF) surface modification was developed. The MHTCL is a multiscale high-disorder amorphous carbon coating with a colored appearance, abundant functional groups, multiscale roughness, a large specific surface area, a high surface energy, and good wetting ability. The O/C atom ratios of the MHTCL-modified CF were in the range of 0.17-0.23, and the functional groups were mainly C-O and C]O groups. During the lowconcentration glucose hydrothermal treatment with the carbon fibers (CFs), the glucose generates furan derivative intermediates, which adsorb on the surface of the CFs and carbonize continuously, finally forming the MHTCL on the CFs. The fracture and rupture of the MHTCL during the forming process produce new nucleation centers on the CF surface, which result in abundant multiscale irregular particles. The MHTCL is a facile method for the modification of CFs. The fabrication of the CF composites demonstrated that the MHTCL obviously increases the interlaminar shear strength of the CF/ polyimide composite and the interfacial interaction of the CF and polyetheretherketone.

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Hydrophobic precipitation of carbonaceous spheres from fructose by a hydrothermal process

Cited by 99 publications

References 21 publications

A simple route to prepare carbonaceous nanospheres from bagasse

A simple route to prepare carbonaceous nanospheres from bagasse

Investigation of a New Natural Particleboard Adhesive Composed of Tannin and Sucrose. 2. Effect of Pressing Temperature and Time on Board Properties, and Characterization of Adhesive

A multiscale hydrothermal carbon layer modified carbon fiber for composite fabrication

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