Wettability of coal pitch surface by aqueous solutions of cationic Gemini surfactants

Chang, Honghong; Zhang, Haochun; Jia, Zhigang; Li, Xing; Gao, Wenchao; Wei, Wenlong

doi:10.1016/j.colsurfa.2016.01.022

Cited by 39 publications

(12 citation statements)

References 26 publications

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“…H. Guo and A. Kantzas 14 applied low eld Nuclear Magnetic Resonance (LF-NMR) to measure the wettability of coal samples of different dimensions and studied the inuence of CO 2 in coals on the wettability of coal samples. H. Chang et al 15 adopted an electrophoretic technique to analyze the wetting relationship between a series of cationic and zwitterionic surfactants and coal pitch. It is concluded that this kind of wetting behavior results from both electrostatic interactions and van der Waals adsorption.…”

Section: -5mentioning

confidence: 99%

Analysis of the microscopic mechanism of coal wettability evolution in different metamorphic states based on NMR and XPS experiments

Zhou

Han

2017

RSC Adv.

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To investigate the evolution of carbon-and oxygen-containing groups during metamorphism and the influence of the structural variation of coal on its wettability, NMR and XPS were employed to study the two main elements, carbon and oxygen, in coal dust. Our results show that with an increase of the metamorphic degree, the number of highly reactive hydroxyl and carboxyl groups show a descending trend whereas the number of low reactivity ether and carbonyl groups increases. The number of carboncontaining groups gradually increases when the metamorphic degree increases, due to a clustering change process which includes an increase in the number of aromatic carbons (Ar-C, H) and a simultaneous decrease in the number of carboxyl carbons (-COOH), methylene carbons (CH 2 ) and ether based carbons (Ar-O, R-O). The reduction rate of carboxyl carbon (-COOH) is closest to the growth rate of aromatic carbon (Ar-C, H). The methyl (CH 3 ) and carboxyl (C]O) carbon evolve discontinuously with the metamorphic degree, which is different from the other carbon groups. Linearregression analysis suggests that the correlation coefficients between aromatic (Ar-C, H), ether (R-O), methylene (CH 2 ) and carboxyl (-COOH) carbons and wettability are 0.98, 0.97, 0.96 and 0.92, respectively, indicating that the main contribution to the wettability from carbon-containing groups comes from these groups. In contrast, hydroxyl oxygen (-OH) has a correlation coefficient as high as 0.98, and is a major contributor from the oxygen-containing groups.

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Section: -5mentioning

confidence: 99%

Analysis of the microscopic mechanism of coal wettability evolution in different metamorphic states based on NMR and XPS experiments

Zhou

Han

2017

RSC Adv.

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“…Chang et al studied the influence of different types of Gemini cationic surfactants on the wettability of coal tar pitch. 24 The results show that the Gemini surfactant changes the surface charge and polarity of coal tar pitch through electrostatic adsorption and van der Waals interactions, thereby affecting the wettability of coal. Though there are numerous reports on the interaction between the surfactant and coal surface, the effect of the surfactant on coal pore water absorption has rarely been studied.…”

Section: Introductionmentioning

confidence: 94%

Effect of Dodecyl Trimethyl Ammonium Bromide on the Migration of Water Molecules in the Pores of Lignite: An Experimental and Molecular Simulation Study

2020

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Molecular dynamics simulations and experiments were used to study the influence of dodecyl trimethyl ammonium bromide (DTAB) on the migration of water molecules in the pores of lignite. To simulate the accuracy, 13 C NMR was used to confirm the structure of Shengli lignite. It was found through adsorption experiments that DTAB reduces the specific surface area and pore volume of lignite. Molecular simulations indicate that the lignite and water molecules are primarily connected by hydrogen bonding. DTAB impedes the movement of water molecules in the pores of lignite and the storage space of compressed water molecules. Water molecules are mainly present in the pores of lignite in a posture parallel to the XOY plane, which facilitates the formation of hydrogen-bonding networks. However, this also leads to a decrease in the mobility of water molecules. Experimental and simulation results show that DTAB can enter lignite pores, reducing the water absorption in lignite. This is highly significant for the processing and utilization of lignite.

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“…Electrostatic theory points out that the asphalt-aggregate interface forms a double-layer electrical layer, which produces attractive electrostatic coulomb force. The strength of interface phase comes from the interaction between the two-layer electrical layers [14,15]. The theory of surface free energy focuses on the physical and chemical adsorption between asphalt and aggregate.…”

Section: Introductionmentioning

confidence: 99%

Effect of asphalt film thickness on shear mechanical properties of asphalt-aggregate interface

Dong

Sun

et al. 2020

Construction and Building Materials

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This paper focuses on the effect of asphalt film thickness on the shear mechanical properties of asphalt aggregate interface. Firstly, an experiment controlling the asphalt film thickness was designed to build the relationship between the asphalt film thickness and the molding load. Then, a shear test was carried out to characterize the properties of asphalt-aggregate interface under different asphalt film. The stressdisplacement curves showed two modes: single and double wave peaks. The probability relationship between the two modes and the asphalt film thickness was established.Finally, the influence of asphalt film thickness on the shear failure mechanism of asphalt-aggregate interface phase was analyzed. Results show that an experimental method for controlling the asphalt film thickness is effectively developed. When the asphalt film thickness is 23.6 μm and 219 μm, only the single wave peak mode appears in the stress-displacement curves. Otherwise, the stress-displacement curves of comparison experiments with other thicknesses show single wave peak and double wave peak, respectively. The double peak probability is found to be related to the asphalt film thickness. The asphalt film thickness is the key point which determines the shear failure behavior of the aggregate-asphalt interface phase, such as cohesive failure or adhesion failure.

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Wettability of coal pitch surface by aqueous solutions of cationic Gemini surfactants

Cited by 39 publications

References 26 publications

Analysis of the microscopic mechanism of coal wettability evolution in different metamorphic states based on NMR and XPS experiments

Analysis of the microscopic mechanism of coal wettability evolution in different metamorphic states based on NMR and XPS experiments

Effect of Dodecyl Trimethyl Ammonium Bromide on the Migration of Water Molecules in the Pores of Lignite: An Experimental and Molecular Simulation Study

Effect of asphalt film thickness on shear mechanical properties of asphalt-aggregate interface

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