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Experimental Study of the Adsorption-Induced Coal Matrix swelling.and Its Impact on ECBM

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Journal of Earth Science 2017年第5期28卷 917-925页

作者： Jia Lin Ting Ren Gongda Wang Patrick Booth Jan Nemcik School of Civil Mining and Environmental Engineering University of Wollongong Mine Safety Technology Branch China Coal Research Institute

Carbon dioxide （CO2） enhanced coalbed methane （ECBM） is an effective method to im- prove methane （CH4） production and this technology has already been used to increase gas production in several field trials worldwide. One major problem is the injection drop in the later period due to permeability decrease caused by coal matrix swelling.induced by CO2 injection. In order to quantify the swelling.effect, in this work, coal samples were collected from the Bulli coal seam, Sydney Basin and adsorption tests with simultaneous matrix swelling.measurement were conducted. The adsorption and swelling.characteristics were analyzed by measuring the adsorption mass simultaneously with the strain measurement. Then experiments were conducted to replicate the ECBM process using the indi- rect gravity method to obtain the swelfing strain change with CO2 injection. The results show that the coal adsorption capacity in CO2 is almost two times greater than that in CH4, and nitrogen adsorption is the least among these gases. A Langmuir-fike model can be used to describe the strain with the gas pressure and the swelling.strain induced by gas adsorption has a Hnear relationship with gas adsorp- tion quantity. Moreover, swelling.strain increase was observed when CO2 was injected into the sample cell and the swelling.strain was almost the sum of the strains induced by different gases at correspond- ing partial gas pressure.

关键词： coal sorption strain ECBM adsorption isotherm swelling.

The role of calcium ions in red light-induced swelling.of mung bean protoplasts

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Chinese Science Bulletin 1995年第3期40卷 248-251页

作者：龙程王小菁潘瑞炽 South China Normal University Guangzhou 510631 China

The process of light signal transduction in photomorphogenesis research is still unknown. Based on the model described by Haupt and Weisenseel, Roux et al. proposed that some phytochrome responses were mediated by calcium ions. This hypothesis has been demonstrated by two well-characterized phytochrome responses, i.e. chloroplast rotation in the alga, Mougeotiat, and red light stimulating spore germenation in the fern, Onoclea.

关键词： calcium ions Ca2+ channel red light mung bean protoplast swelling.

NMR Microimaging of Swollen γ-Irradiated Crosslinked cis 1,4-Polybutadiene

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Chinese Science Bulletin 1994年第18期39卷 1524-1527页

作者：赵新沈伊民杜有如叶朝辉 State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics Academia Sinica Wuhan 430071 PRC Fudan University shanghai 200433PRC

NMR imaging has become a routine technique for medical and biological science and is finding increasing application to materials research. It is a nondestructive and noninvasive technique used to study properties of v... 详细信息

关键词： NMR microscopy irradiation crosslinking cis 1 4-polybutadiene swelling.

Temperature-, and pH-Responsiveness Properties of a Biopolymer Based on kC-g-poly （AA-co-NIPAM）

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Journal of Chemistry and Chemical Engineering 2011年第6期5卷 569-575页

作者： Mohammad Sadeghi Mojgan Yarahmadi Department of Chemistry Science Faculty Islamic Azad University Arak Branch Arak Iran Department of English Islamic Azad University Arak Branch Arak 38135-567 Arak Iran

A novel thermo-sensitive superabsorbent hydrogel with salt- and pH-responsiveness properties was obtained by grafting of mixtures of acrylic acid （AA） and N-isopropylacrylamide （N1PAM） monomers onto kappa-carrageenan, kC, using ammonium persulfate （APS） as a free radical initiator in the presence of methylene bisacrylamide （MBA） as a crosslinker. Infrared spectroscopy was carried out to confirm the chemical structure of the hydrogel. Moreover, morphology of the samples was examined by scanning electron microscopy （SEM）. The effect of MBA concentration and AA/NIPAM weight ratio on the water absorbency capacity has been investigated. The swelling.variations of hydrogels were explained according to swelling.theory based on the hydrogel chemical structure. The hydrogels exhibited salt-sensitivity and cation exchange properties. The temperature- and pH-reversibility properties of the hydrogels make the intelligent polymers as good candidates for considering as potential carriers for bioactive agents, e.g. drugs.

关键词： Superabsorbent carrageenan acrylic acid N-isopropylacrylamide hydrogel swelling.