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alkali activation 1

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Solvability and thermal response of cellulose with different crystal configurations

Qian CHEN, Kai ZHENG, Qingtao FAN, Kun WANG, Haiyan YANG, Jianxin JIANG, Shijie LIU

Frontiers of Engineering Management 2019, Volume 6, Issue 1,   Pages 62-69 doi: 10.1007/s42524-019-0001-z

Abstract:

Cellulose is a biodegradable and renewable natural material that it is naturally resistant to breaking and modification. Moreover, the crystalline structure of cellulose is a major factor restricting its industrial utilization. In this study, cellulose polymorphs were prepared from natural cellulose, and their solvability and thermal response were investigated. Using liquid- and solid-state NMR signals, the distinct types and dissolving states of cellulose polymorphs were identified. The thermal behavior of the polymorphic forms of cellulose-d was also evaluated, and cellulose II exhibited the poorest thermal stability and a unique exothermic reaction.

Keywords： cellulose     crystal structure     thermal response     XRD     CP/MAS 13C NMR    

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Large-scale synthesis of isolated Mn2O3 nanotube/fiber with ferric nitrate as catalyst

ZHANG Aifei, LIU Jiping, L? Guangshu

Frontiers of Chemical Science and Engineering 2007, Volume 1, Issue 1,   Pages 55-58 doi: 10.1007/s11705-007-0011-y

Abstract: X-ray diffraction (XRD) result shows that the O nanotube has a crystalline structure different from o-O

Keywords： different     nickel     exterior diameter     nanotube     XRD    

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Experiments on the effect of the pressure on the mineral transformation of coal ash under the different reaction atmosphere

Nijie JING, Qinhui WANG, Zhongyang LUO, Tao JIE, Xiaomin LI, Kefa CEN

Frontiers of Chemical Science and Engineering 2010, Volume 4, Issue 4,   Pages 394-399 doi: 10.1007/s11705-010-0505-x

Abstract: ash fusibility with high-pressure thermogravimetric analysis (PTGA) apparatus and X-ray diffraction (XRDEach specimen analyzed by XRD was observed for the mineral conversion and formation of new minerals with

Keywords： ash fusibility     XRD analysis     PTGA     low-temperature eutectic    

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Establishing two-stage interaction between fly ash and NaOH by X-ray and infrared analyses

Bhagwanjee JHA,Nevin KOSHY,Devendra Narain SINGH

Frontiers of Environmental Science & Engineering 2015, Volume 9, Issue 2,   Pages 216-221 doi: 10.1007/s11783-014-0630-8

Abstract: The interaction of the fly ash and NaOH, in an open reflux hydrothermal system at 100°C, has been explored by several researchers and formation of fly ash zeolites has been confirmed based on the X-ray diffraction analysis of the residues. However, this method does not reveal much about the characteristic transitions (viz. elemental, electro-negativity and cation exchange capacity) of the residues. In this situation, resorting to Fourier transform-infrared radiation (FT-IR) spectroscopy on the residues obtained from two-stage hydrothermal treatment process, described in this manuscript, appears to be a novel idea to establish transitions in chemical bonds (viz., -Si-OH-Al-, OH-Na, OH-Al-), crystallinity and cation exchange capacity of these residues. Based on extensive studies, it has been demonstrated that FT-IR spectroscopy is extremely useful for 1) detection of chemical bonds in the residues, 2) evaluation of zeolites in the residues and 3) also establishing the superiority of the two-stage interaction of the fly ash with NaOH for synthesizing better fly ash zeolites (viz., Na-P1 and Hydroxysodalte) as compared to those obtained from the conventional single-stage treatment of the fly ash.

Keywords： hydrothermal treatment     alkali activation     fly ash zeolites     X-ray diffraction (XRD) and Fourier transform-infrared    

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β-Nickel hydroxide cathode material for nano-suspension redox flow batteries

Yue LI, Cheng HE, Elena V. TIMOFEEVA, Yujia DING, Javier PARRONDO, Carlo SEGRE, Vijay RAMANI

Frontiers in Energy 2017, Volume 11, Issue 3,   Pages 401-409 doi: 10.1007/s11708-017-0496-0

Abstract: the nanoparticles were characterized by scanning electronic microscopy (SEM) and X-ray diffraction (XRDThe XRD patterns confirmed that β-Ni(OH) was successfully synthesized, while SEM results showed that

Keywords： nano-suspension flow battery     β-Ni(OH)2     scanning electronic microscopy (SEM)     X-ray diffraction (XRD    

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Title Author Date Type Operation

Solvability and thermal response of cellulose with different crystal configurations

Qian CHEN, Kai ZHENG, Qingtao FAN, Kun WANG, Haiyan YANG, Jianxin JIANG, Shijie LIU

Journal Article

Large-scale synthesis of isolated Mn2O3 nanotube/fiber with ferric nitrate as catalyst

ZHANG Aifei, LIU Jiping, L? Guangshu

Journal Article

Experiments on the effect of the pressure on the mineral transformation of coal ash under the different reaction atmosphere

Nijie JING, Qinhui WANG, Zhongyang LUO, Tao JIE, Xiaomin LI, Kefa CEN

Journal Article

Establishing two-stage interaction between fly ash and NaOH by X-ray and infrared analyses

Bhagwanjee JHA,Nevin KOSHY,Devendra Narain SINGH

Journal Article

β-Nickel hydroxide cathode material for nano-suspension redox flow batteries

Yue LI, Cheng HE, Elena V. TIMOFEEVA, Yujia DING, Javier PARRONDO, Carlo SEGRE, Vijay RAMANI

Journal Article