Geoenergy Science and Engineering
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2024
·
IF 0
Jian-gen Xu,Liang Wang,Xueying Lyu,Saman Azadbakht,Meng Li,Kanhua Su,Yuhao Huang
High-performance shale stabilizers are urgently required to address the concerns of wellbore instability when drilling troublesome shale wells. Herein, a novel paraffin wax microemulsion (PM) containing cationic surfactant was prepared and evaluated for shale formations. The shale stability performance of PM was studied using shale pressure penetration test, shale swelling and dispersion test. The shale stabilization mechanism of PM was investigated by surface tension, contact angle, surface free energy , capillary tube rise and SEM tests. The experimental findings showed that the pressure penetration time in shale after treatment with PM was extended from 13 to 107 min. And PM could decrease the shale swelling rate by 41.5%, and increase the recovery rate to 89.4%. PM exhibited better sealing and inhibition properties than that of commonly used shale stabilizers. The mechanism research revealed that the nano-droplets in PM could freely penetrate into shale pores and cracks of different sizes to form an effective sealing membrane. The water contact angle reached 91.4° after treatment with PM and the surface energy was significantly reduced, effectively inhibiting surface hydration. Through decreasing the surface tension and changing the wettability , the capillary force experienced a noticeable decrease with further enhanced inhibition of shale hydration. Therefore, the application of PM for shale stabilization exhibited promising potential, suggesting its possible effective utilization in shale drilling.
研究领域:
石油工程
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材料科学
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产品关联
DOI
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
·
IF 3.131
Jincheng Mao,Jizhen Tian,Wenlong Zhang,Xiaojiang Yang,Heng Zhang,Chong Lin,Yang Zhang,Zhaoyang Zhang,Jinzhou Zhao
Gemini cationic surfactants, which have two cationic surfactant molecules connected by a spacer, have received increased attention in recent years as very good thickeners for clean fracturing fluids. We synthesized four Gemini cationic surfactants with three, four, five, and six methylene groups in the spacers. Salts can promote micelle aggregation of viscoelastic surfactants (VESs) and affect their performance and we used potassium chloride (KCl) to study the performance differences of the surfactants with different spacer lengths. The results showed that the surfactant with three methylene groups in its spacer had the lowest critical micelle concentration, and when combined with KCl in solution, it had the best salt tolerance and apparent viscosity in KCl concentrations ranging from 0.2 wt% to 2.6 wt%. In addition, the solution also exhibited an excellent viscoelasticity and a tighter network microstructure, which was confirmed by SEM observation and oscillatory measurement. We conducted rheological measurements for the four Gemini cationic surfactant fracturing fluid formulations with a shear rate of 170 s −1 at up to 100 °C. The solution with KCl and the surfactant with the shortest spacer had distinctly superior rheological properties, and its viscosity could be maintained above 58 mPa.s after 120 min. Finally, we did proppant suspension tests, gel breaking property tests, and core matrix permeability damage rate tests on the four optimized fracturing fluid systems. The solution prepared by KCl and the surfactant with the shortest spacer was found to have the most favorable properties for fracturing fluids. These results demonstrate that decreasing the spacer length of a Gemini cationic surfactant leads to better performance in fracturing fluids.
研究领域:
化学工程
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材料科学
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石油工程
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DOI
高影响因子
STAR Protocols
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2024
·
IF 1.3
Shuqi Wang,Hao Chen,Tianyu Zhong,Quanzheng Deng,Shaobo Yang,Yuanyuan Cao,Lu Han,Yongsheng Li
Summary New symmetries of the gyroid (G) surfaces are the key to their intriguing properties. Here, we present a protocol to create a tetragonal gyroid substructure (shifted tG) outside the traditional cubic symmetry of G surfaces. We describe steps for employing a binary self-assembly system consisting of block copolymers and surfactants. We detail procedures for fabrication and structure regulations by changing the proportion of the reaction components. For complete details on the use and execution of this protocol, please refer to Wang et al. 1
研究领域:
材料科学
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高分子化学
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DOI
PubMed
高影响因子
Nanoscale Research Letters
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2011
·Vol. 6
·期 1
·1-6
·
IF 2.56
Zou Yu,Li Dongsheng,Yang Deren
Monodispersed CdS nanocrystals with controllable shape and phase have been successfully synthesized in this study by adding cationic surfactant in noninjection synthesis system. With the increase of the amount of cetyltrimethylammonium chloride (CTAC) added, the shape of the CdS nanocrystals changed from spherical to multi-armed, and the phase changed from zinc-blende to wurtzite. It was found that halide ion Cl - plays a key role in the transformation, and other halide ions such as Br - can also induce similar transformation. We proposed that the strong binding between Cd 2+ and halide ions reduced the reactivity of the precursors, decreased the nuclei formed in the nucleation stage, and led to the high concentration of precursor in the growth stage, resulting in the increase of size and phase transformation of CdS nanocrystals. In addition, it was found that the multi-armed CdS nanocrystals lost quantum confinement effect because of the increase of the size with the increase of the concentration of CTAC.
研究领域:
材料科学
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纳米技术
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF CATALYSIS
·
2012
·
IF 6.002
Lin Guo,Xiaojun Bao,Yu Fan,Gang Shi,Haiyan Liu,Danjiang Bai
The structure, acidity, and n -octane di-branched isomerization of SAPO-11 synthesized with surfactants of different chain lengths in water–propanol system were investigated. The results showed that with the increasing chain length of surfactants, the crystallite size of SAPO-11 firstly decreased and then increased, but the external surface area and the active B acid sites of SAPO-11 firstly increased and then decreased. The smallest crystallite, the highest external surface area, and the most B acid sites were obtained simultaneously with the surfactant of 12 carbon atoms. The isomerization results of n -octane indicated that among the series Pt/SAPO-11 catalysts, the catalyst with DoTAB-directed SAPO-11 as support had the highest selectivity to di-branched isomers and the lowest cracking selectivity due to the largest external surface area that created more active sites to promote the formation of di-branched isomers by the key-lock mechanism and improve the diffusion of intermediates and products for reducing cracking reactions.
研究领域:
化学工程
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催化科学
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产品关联
DOI
高影响因子
International Journal of Nanomedicine
·
2018
·
IF 4.37
Hongwei Lin,Qingchun Xie,Xin Huang,Junfeng Ban,Bo Wang,Xing Wei,Yanzhong Chen,Zhufen Lu
Aim The aim of this work was to develop a novel vesicular carrier, ultradeformable liposomes (UDLs), to expand the applications of the Chinese herbal medicine, imperatorin (IMP), and increase its transdermal delivery.Methods In this study, we prepared IMP-loaded UDLs using the thin-film hydration method and evaluated their encapsulation efficiency, vesicle deformability, skin permeation, and the amounts accumulated in different depths of the skin in vitro. The influence of different charged surfactants on the properties of the UDLs was also investigated.Results The results showed that the UDLs containing cationic surfactants had high entrapment efficiency (60.32%±2.82%), an acceptable particle size (82.4±0.65 nm), high elasticity, and prolonged drug release. The penetration rate of IMP in cationic-UDLs was 3.45-fold greater than that of IMP suspension, which was the highest value among the vesicular carriers. UDLs modified with cationic surfactant also showed higher fluorescence intensity in deeper regions of the epidermis.Conclusion The results of our study suggest that cationic surfactant-modified UDLs could increase the transdermal flux, prolong the release of the drug, and serve as an effective dermal delivery system for IMP.
研究领域:
药学
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药物递送系统
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中药
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DOI
PubMed
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 24
·13378-13385
·
IF 3.049
Fangfang Peng,Yangchuan Ke,Yi Zhao,Xu Hu,Xi Zhao
The properties of O/W emulsions can be improved by the addition of nanomaterials. To explore the influence of organically intercalated montmorillonites (OMts) on the properties of O/W emulsions, we introduced an OMt into a nanoemulsion as a co-stabilizer with the quaternary ammonium Gemini cationic surfactant (G16-2-16) and nonionic lauryl polyoxyethylene ether (Brij 30). The influence of the organically intercalated montmorillonite (OMt) on the properties, such as the interfacial tension, zeta potential, stability, conductivity and morphology of the droplets, of the nanoemulsions was investigated. The results indicate obvious synergistic effects of OMt with G16-2-16. At the concentration of 0.15% w/v G16-2-16, ultralow interfacial tension (IFT) of the O/W results in the formation of nanoemulsions in a much shorter time with 3.4 × 10−3% w/v OMt than that in the case of without OMt; however, at the concentration of 0.2% w/v G16-2-16, the interfacial tension of the O/W increased upon the addition of 3.4 × 10−3% w/v OMt. In addition, light transmission measurements showed that the transmission of the nanoemulsions varied with temperature, and the process was reversible. The mechanisms of these phenomena were analyzed and confirmed by TEM.
研究领域:
材料科学
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化学工程
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DOI
PubMed
高影响因子
Journal of Physical Chemistry C
·
2021
·
IF 4.126
Xiaofeng Sun,Xiaobin Dai,Shengju Zhou,Haiqiao Wang,Aoxue Xu,Litang Yan,Hongguang Li,Jingcheng Hao
To prepare supramolecular structures with interesting dimensions and morphologies using nanometer-sized building blocks is highly challenging. Herein, negatively charged carbon dots (n-CDs), which bear carboxy and hydroxyl groups on the surfaces, are mixed, respectively, with two cationic surfactants in water, i.e., 1-tetradecyl-3-methylimidazolium bromide (C14mimB) and tetradecyltrimethylammonium bromide (TTAB). The phase behavior and aggregate transition in n-CDs/C14mimB and n-CDs/TTAB mixtures were investigated in detail. At a fixed concentration of n-CDs (cn-CDs, 0.1 mg·mL–1), both systems exhibit a phase sequence of an isotropic phase (I1), a turbid phase (T1), a precipitated phase (P), a second turbid phase (T2), and a second isotropic phase (I2) with increasing concentration of the surfactant (cs). While only vesicles were observed in the T1 phase, hexosomes were also detected in the T2 phase in addition to vesicles. The phase transition obtained by the experiments gains solid support from computer simulations using a dissipative particle dynamics method, which give structural details of the hexosomes and evidence of anion−π interaction in an n-CDs/C14mimB system. The results obtained in the current study reinforce the conclusion that CDs/surfactant is a good combination for facile construction of supramolecular structures. The aggregates with diverse morphologies open up the possibility of a variety of future applications.
研究领域:
材料科学
·
化学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Meng Cun,Jincheng Mao,HaiLin Sun,Guo Wei,Feng Tang,Wenlong Zhang,Jizhen Tian,Xiaojiang Yang,Chong Lin,ZiGao Huang
In recent years, cationic surfactants have received extensive attention in cleaning fracturing fluid thickeners due to various unique properties. At the same time, the development of temperature-resistant and salt-resistant clean fracturing fluid is the key to deep well oil and gas resource development. In this study, the rigid-soft combined strategy is adopted for molecular structure designs. N,N -dimethylcyclohexylamine and epichlorohydrin are used as the initial reactants; after the ring-opening reaction occurs, they are quaternized with erucamide propyl dimethyl ammonium to synthesize a novel double-cation viscoelastic surfactant , SY–JS. With double-cationic charges on the head group, water molecules are selectively adsorbed around the cation lattice to increase the hydration layer, and thus, salt tolerance is improved. Cyclohexane with a rigid structure improves temperature resistance. The ultra-long unsaturated hydrophobic tail imparts excellent heat tolerance and dissolubility to the designed viscoelastic surfactant. The clean fracturing fluid prepared by 3 wt% SY–JS with 130,000 ppm NaCl or KCl performs well under a shear rate of 170 s −1 at 140 °C, and the apparent viscosity remains above 30 mPa s −1 after 120 min.. Additionally, the results show that single-tail surfactants exhibit excellent performance at approximately 140 °C. Afterward, the brine produced from Rumaila and Jiyuan oil fields is used to prepare brine-based clean fracturing fluids, and evaluations, including proppant suspension, gel breaking, and permeability damage, were conducted. The results show that the brine-based clean fracturing fluid completely meets the requirements of hydraulic fracturing industrial application.
研究领域:
石油工程
·
化学工程
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产品关联
DOI
高影响因子
Polymers
·
2018
·Vol. 10
·期 11
·1215
·
IF 2.935
Wenlong Zhang,Jincheng Mao,Xiaojiang Yang,Heng Zhang,Zhaoyang Zhang,Bo Yang,Yang Zhang,Jinzhou Zhao
Gemini surfactant, as a functionally flexible polymer-like material in the aqueous solution, has attracted increased attention in reservoir stimulation of hydraulic fracturing in recent decades. A new Gemini cationic viscoelastic surfactant named JS-N-JS, which has a secondary amine spacer group and two ultra-long hydrophobic tails, was synthesized from erucamidopropyl dimethylamine, diethanolamine, and thionyl chloride as a thickener for hydraulic fracturing fluid. Compared with some Gemini cationic surfactant with methylene spacer, JS-N-JS showed a lower critical micellar concentration (CMC) and higher surface activity due to the hydrogen bond formed between the secondary amine and water molecule intends to reduce electrostatic repulsion, which is more beneficial to be the fracturing fluid thickener. Moreover, the performance of JS-N-JS solution can be further improved by salts of potassium chloride (KCl) or sodium salicylate (NaSal), while organic salt behaved better according to the measurements. The SEM observation confirmed that JS-N-JS/NaSal system owned a tighter network microstructure, and JS-N-JS/NaSal system exhibited a distinct superior viscoelasticity system at a sweep frequency of 0.1–10 Hz. As a fracturing fluid, the solution with a formula of 30 mmol JS-N-JS and 100 mmol NaSal was evaluated according to the petroleum industrial standard and presented excellent viscoelastic properties, the viscosity of which can maintain above 70 mPa·s for 110 min under a shear rate of 170 s−1at 120 °C. Meanwhile, the drag reducing rate of the formula could reach above 70% with the increase of shear rate. Finally, the viscous fracturing fluid can be broken into the water-like fluid in 1.2 h after being fully exposed to hydrocarbons and the water-like fluid presented a low damage to the tight sand reservoirs according to the core flooding experiments, in which the permeability recovery rate can reach 85.05%. These results fully demonstrate that the JS-N-JS solution fully meets the requirement of the industrial application of hydraulic fracturing.Keywords:Gemini cationic surfactant;salt-induced;wormlike micelles;viscoelasticity;clean fracturing fluid
研究领域:
化学工程
·
石油工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2017
·
IF 1.591
Yanyan Liu,Lihua Jia,Xiangfeng Guo,Zhenlong Zhao
A new series of cationic surfactants, N–alkyl–N,N–dimethyl–N–(p–(hydroxymethyl) benzyl) ammonium chlorides (p-DHBA-m), were synthesized and the structures were characterized by 1HNMR, 13CNMR, FT–IR and ESI–MS. The surface activities, thermodynamic properties and aggregation behaviors of p-DHBA-m in aqueous solutions were respectively studied by means of surface tension, isothermal titration calorimetry and steady-state fluorescence methods. Thermodynamic parameters show that the micellization is an entropy-driven process. According to the fluorescence quenching method, the micelle aggregation numbers (Nagg) of p-DHBA-m were calculated and found that the increase of temperature or the elongation of alkyl chain length could lead to the reduction of the Nagg, respectively.
研究领域:
化学
·
物理化学
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产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Ling Yao,Lei Ouyang,Jiping Lv,Pei Dai,Lihua Zhu
There is an increasing demand for rapid and sensitive detection of hydrophobic contaminants in foods. A rapid and sensitive surface enhanced Raman scattering (SERS) detection method was developed for this purpose, based on the surface modification of nano-Ag aggregates, which had rich hot spots and controllable hydrophobicity. Cationic surfactants with different carbon chain lengths were employed to modify the aggregation of Ag nanoparticles. The adsorption of cationic surfactants on nano-Ag aggregates increased the hydrophobicity of the surface of the nano-Ag aggregates as the SERS substrate. By changing the carbon chain length of the surfactant, the hydrophobicity of the SERS substrate was able to be tuned to match with the hydrophobicity of the contaminants to be detected. Different hydrophobic contaminants such as Auramine O, Sudan I and Sudan III could be quantitatively detected, with a detection limit as low as 6.1 × 10 −8 , 7.5 × 10 −9 , 2.1 × 10 −9 mol L −1 , respectively. Compared with the traditional inorganic salt aggregation method which was unable to meet the requirements of direct quantitative detection in the sample matrices, the developed method was confirmed to have the advantages of low detection limit, good reproducibility (relative standard deviation (RSD) is less 7.6%), short operation time (about 1 min), and no need of any complicate pretreatment for sample preparation.
研究领域:
分析化学
·
食品安全
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）