JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
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2017
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IF 1.591
Lei Fu,Zhongni Wang,Xuepeng Li,Li Zhang
The mixed micellization of the anionic surfactant sodium oleate (NaOL) and three anionic surfactants (NaDC, AOT, SDS) of different structures in 0.01 mol/L NaCl solution was investigated by surface tension measurement at different temperatures. All the investigated mixtures exhibited nonideal behaviors as the experimental critical micelle concentration (CMC) values were less than the values calculated by using the Clint’s equation. Negative βm values calculated by using Rubingh’s equation and |ln(CMC1/CMC2)| < |βm| proved synergism in the three systems of higher αNaOL or lower αNaOL. An interesting phenomenon of double inflection points was observed for pure NaOL and mixtures of high αNaOL. The negative ΔG0m values for the mixed systems imply that the micelle formations are spontaneous process. The NaOL/NaDC system was also studied in buffer solution (pH 8, 12) at 30°C which also exhibited nonideal behavior. Synergism existed at pH 12 but not at pH 8 for the NaOL/NaDC system. It is noteworthy that there were no double inflection points for NaOL/NaDC system in buffer solution (pH 8, 12). Krafft point and calcium stability data show that these three anionic surfactants can improve the water solubility and hard-water resistance of soap.
研究领域:
化学
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表面科学
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DOI
高影响因子
GEOFLUIDS
·
2024
·Vol. 2024
·期 1
·9112308
·
IF 1.2
Hongmei Li,Yun Zhao,Jie Deng,Jing Xie,Weiqi Zhou,Yiting Liu,Luming Li,Futing Xia,Rui Qi
The optimization of coal dust management in fluidized mining environments is of paramount importance, yet it is currently impeded by a gap in understanding chemical dust suppression mechanisms. This study combines indoor experiments with molecular simulation to investigate the mechanisms by which three anionic surfactants with different hydrophilic and hydrophobic groups (SDBS, SDS, and SLS) influence coal wettability. Using hydrophobic bituminous coal as the experimental subject, basic physical and chemical properties are analyzed through proximate analysis, XRD, and FTIR. The effect of different surfactants on coal wettability is characterized based on sedimentation experiments, while the coal–surfactant–water three-phase model examines the equilibrium adsorption configuration, water molecule diffusion coefficient, and interaction energy in different adsorption systems. The surface free energy of coal dust and its components is measured before and after surfactant adsorption, verifying the adsorption-wetting mechanism of surfactants at the coal–water interface. Results show that anionic surfactants enhance wettability through a bidirectional adsorption mechanism at the coal–water interface: the hydrophobic tail adheres to the coal surface via van der Waals forces, while the hydrophilic head faces the water phase, driven by electrostatic and hydrogen bonding interactions. This coordinated adsorption process alters water diffusion and the surface free energy of coal, thereby improving wettability. SDBS, due to its benzene ring, significantly amplifies the bidirectional adsorption effect, achieving the most substantial improvement in coal dust wettability. The findings provide a robust theoretical framework for developing dust control strategies in fluidized mining operations, advancing the field toward more efficient and sustainable mining practices.
研究领域:
矿业工程
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化学工程
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计算科学
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2025
·
IF 9
Wan-Ting Lin,Jia-Wen Yu,Ping Fu,Wan-Long Li,Zi-Lu Zhang,Xiao-Wei Luo,Zhi-Kang Xu,Ling-Shu Wan
Polymer nanofiltration membrane has been widely used in various fields. However, it generally suffers from pore expansion at high operating temperature, leading to deterioration in separation performance. It is important to develop thermally resistant membranes to meet high temperature separation requirement for energy conservation and improving economic benefit. Herein, three kinds of anionic dodecyl surfactants were used to assist the interfacial polymerization process to form polyamide layers with high crosslinking degree for high-temperature separation. Results show that the thickness of the polyamide layer increases dramatically with the addition of surfactant, and the surface wettability and surface charges change little. The appropriate addition of surfactants can increase the harmonic amide bond density of the polyamide layer. The optimal membrane exhibits excellent pore size stability as well as high-temperature separation performance with water permeance of 31.3 L m −2 h −1 bar −1 and MgSO 4 rejection of 98.0 % at 85 °C. The membrane also shows stable separation performance during cycling variations between 25 and 85 °C and a 100-h long-term operation at 85 °C. This work demonstrates a feasible and scalable method for fabricating nanofiltration membranes for high-temperature separation.
研究领域:
材料科学
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环境工程
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DOI
高影响因子
ENVIRONMENTAL POLLUTION
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2019
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IF 5.714
Changjing Li,Yuan Gao,Aimin Li,Lei Zhang,Guozhao Ji,Kongyun Zhu,Xuexue Wang,Yulin Zhang
Norfloxacin (NOR) is a persistent organic pollutant and can be effectively removed from effluent by adsorption of biochar. However, the presence of other emerging contaminants , such as surfactants, will potentially alter adsorption performance of norfloxacin by biochar and the molecular-scale mechanisms of the interaction between surfactants and biochar remain poorly understood. In this study, adsorption of norfloxacin on magnetic biochar prepared with iron-containing furfural residue (FRMB) in the presence or absence of anionic surfactants was investigated. The adsorption of NOR was significantly affected by the initial pH and anionic surfactants-sodium dodecyl sulfate (SDS) and sodium dodecyl benzene sulfonate (SDBS). In the presence of SDS and SDBS, the maximum sorption capacities of NOR were 2.33 and 1.97 times higher than that in the absence of surfactants, reached to 698.6 mg g −1 and 589.9 mg g −1 , respectively. The optimal pH condition which was 4 indicated that electrostatic adsorption played a decisive role in the adsorption process after introduction of SDS/SDBS. The adsorption data were fitted well by the Elovich model and Freundlich model at the optimal conditions in which both SDS and SDBS were hemimicelle (0.8 mM SDS or 0.4 mM SDBS), indicating surface heterogeneity of FRMB and the adsorption mechanism was related to the assembly of surfactants on biochar. FTIR results showed that FRMB and SDS/SDBS interacted through hydrophobic action, and more complex or aggregates were formed between the NOR and biochar/SDS/SDBS. This work highlights the synergistic enhancement effects of tested surfactants on the removal of NOR by magnetic biochar from aqueous systems.
研究领域:
环境科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2023
·
IF 6
Xiaolin Wu,Zhaowei Hou,Haifeng Wang,Yong Yang,Xiaomin Liu,Zhao Chen,Zhenggang Cui
In foam flooding, foams stabilized by conventional anionic surfactants are usually raptured in contacting with crude oil, which behaves as a strong defoamer. In this article the synergistic effects between anionic surfactant SDS and negatively charged hydrophilic silica nanoparticles in stabilization of aqueous foams were examined. The results show that in either deionized (DI) water at 25 °C or Daqing simulated connate (SC) water with a total salinity of 6,778 mg/L at 45 °C, in absence of oil adding low concentration of silica nanoparticles into the SDS aqueous solutions can improve the foam performance of SDS mainly by increasing foam stability, as indicated by a synergistic effect index Se(d/s) (ratio of the composite foaming index of dispersion to that of solution) of 2.7 to 2.8. In presence of oil the foam performance of SDS in SC water at 45 °C can still be improved as indicated by an increased Se(d/s) of 3.7, but the maximum composite forming index is catastrophically reduced from 3222 Ls in absence of oil to 470 Ls in presence of oil. As similarly charged nanoparticles the silica nanoparticles do not adsorb at gas/liquid or oil/water interface to stabilize Pickering foams or Pickering emulsions but can improve emulsification of the oil, and the emulsified oil droplets together with the silica nanoparticles distribute in aqueous lamellae enhancing liquid viscosity and slowing down the liquid drainage in the foams. However, this effect weakens at high surfactant concentration, and addition of silica nanoparticles does not significantly reduce the interfacial tensions involved. The Enter (E), Spreading (S) and Bridging (B) coefficients of the oil in the foam systems are therefore still positive. The defoaming action of the oil in this system is not eliminated by only partially inhibited by addition of silica nanoparticles.
研究领域:
石油工程
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材料科学
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界面化学
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产品关联
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
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2023
·
IF 6.4
Sisi Liu,Lu Luo,Hualiang Huang,Gangliang Huang
The efficient and long-lasting corrosion inhibition mechanism of bis(2-ethylhexyl) sulfosuccinate sodium (AOT) on AZ91D Mg alloy in oxalic acid solution were studied by electrochemical methods, surface techniques, theoretical calculations and simulations. The findings demonstrated that AOT was an effective and long-lasting corrosion inhibitor, the corrosion inhibition rate of 6.75 mM AOT was 89.84 % and raised in corrosion inhibition effectiveness with increasing soaking duration. The adsorption of AOT followed Langmuir adsorption isotherm and belonged to physical and chemical mixed adsorption. The polar sulfonyl group of AOT gradually almost vertically adsorbed on its surface to produce a uniform, dense, and thick protective layer to inhibit its corrosion, and the hydrophobicity of the alkyl chain of AOT repelled corrosive medium.
研究领域:
材料科学
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电化学
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表面科学
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DOI
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2020
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IF 4.192
Zhaolan Zhai,Shengfeng Ye,Xinyan Yan,Zhanqian Song,Shibin Shang,Xiaoping Rao,Jie Song
A novel pH-responsive wormlike micellar viscoelastic solution was constructed by a rosin-based anionic surfactant (Na-MPA-AZO-Na) in the presence of cetyltrimethylammonium bromide (CTAB). The viscoelasticity, aggregate morphology, and pH-responsiveness of the pH-responsive wormlike micelles have been investigated through the method of rheology and cryogenic-transmission electron microscopy. Its corresponding mechanism has been studied using 1H NMR and 1H–1H 2D NOESY HNMR. The zero-shear viscosity (η0) of the wormlike micellar solution rapidly decreases by 3 orders of magnitude as the pH increases from 5.21 to 9.56. The viscoelastic fluids and water-like solutions can be converted by tuning the pH between 3.62 and 12.00, and the corresponding aggregates also transform between wormlike micelles and spherical micelles. In addition, the wormlike micellar cross-sectional diameter is approximately 10 nm, which is remarkably larger than that of the common wormlike micelles. The phenomenon can be attributed to the large steric volume of the rosin rigid skeleton. When the pH is 12.00, a “pseudo” Gemini surfactant is constructed by Na-MPA-AZO-Na and CTAB through the electrostatic interactions. Wormlike micelles also can be formed with the increasing concentrations. The η0 of the wormlike micellar system shows strong dependence on concentration with an exponent of 9.6 (η0 ∝ C9.6). This work further promotes new applications of forest resources.
研究领域:
材料科学
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化学工程
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生物医学
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DOI
PubMed
高影响因子
Scientific Reports
·
2023
·Vol. 13
·期 1
·1-7
·
IF 4.6
Qin Guofu,Zou Keting,He Fengrui,Shao Ji,Zuo Bei,Liu Jia,Liu Ruixiao,Yang Bixia,Zhao Guipeng
This study developed a method for the simultaneous determination of volatile phenol, cyanide, anionic surfactant, and ammonia nitrogen in drinking water, using a continuous flow analyzer. The samples were first distilled at 145 °C. The phenol in the distillate then subsequently reacted with alkaline ferricyanide and 4-aminoantipyrine to form a red complex that was measured colorimetrically at 505 nm. Cyanide in the distillate subsequently reacted with chloramine T to form cyanogen chloride, which then formed a blue complex with pyridinecarboxylic acid that was measured colorimetrically at 630 nm. The anionic surfactant reacted with basic methylene blue to form a compound that was extracted into chloroform and washed with acidic methylene blue to remove interfering substances. The blue compound in chloroform was determined colorimetrically at 660 nm. Ammonia reacted with salicylate and chlorine from dichloroisocyanuric acid to produce indophenol blue at 37 °C in an alkaline environment that was measured at 660 nm. The relative standard deviations were 0.75–6.10% and 0.36–5.41%, respectively, and the recoveries were 96.2–103.6% and 96.0–102.4% when the mass concentration of volatile phenol and cyanide was in the range of 2–100 μg/L. The linear correlation coefficients were ≥ 0.9999, and the detection limits were1.2 μg/L and 0.9 μg/L, respectively. The relative standard deviations were 0.27–4.86% and 0.33–5.39%, and the recoveries were 93.7–107.0% and 94.4–101.7%. When the mass concentration of anionic surfactant and ammonia nitrogen was 10–1000 μg/L. The linear correlation coefficients were 0.9995 and 0.9999, and the detection limits were 10.7 μg/L and 7.3 μg/L, respectively. When compared to the national standard method, no statistically significant difference was found. This approach saves time and labor, has a lower detection limit, higher precision and accuracy, less contamination, and is more appropriate for the analysis and determination of large-volume samples.
研究领域:
环境科学
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分析化学
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产品关联
DOI
PubMed
高影响因子
ACS Omega
·
2019
·
IF 2.584
Chaochao Qu,Ji Wang,Hongyao Yin,Guangliang Lu,Zuyou Li,Yujun Feng
Foams are widely used to remove liquid loading at the bottom of gas wells to improve natural gas production. However, it becomes ineffective when a gas well contains a large amount of hydrocarbon condensate because oil will rupture the foams. In this work, condensate oil-tolerant foams were developed and stabilized by a mixture of cocamidopropyl hydroxyl sulfobetaine (CHSB) and sodium dodecyl sulfate (SDS). The foam properties are examined at different temperatures under atmospheric conditions and high pressures with various contents of condensate oil. It is found that the foam stability is improved when the oil content is increased; in addition, high temperature, high salinity, and high pressure are beneficial for foam stabilizing. To reveal the mechanism of stable foam in the presence of high content of oil, a confocal microscope was employed to visualize oil–foam interactions. It was observed that the high stability of the SDS–CHSB foams is ascribed to the formation of stable pseudoemulsion between oil droplets and the gas–liquid interface. Such condensate oil-tolerant foams show promising potential to be used in the foam-assisted lift process during natural gas production.
研究领域:
石油工程
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界面化学
·
能源技术
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DOI
PubMed
高影响因子
JOURNAL OF SURFACTANTS AND DETERGENTS
·
2025
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IF 1.8
Xueyi Hu,Yongjin Zhang,Fei Qian,Jianyi Liu,Guiju Zhang,Yongmei Xia
Surfactant-assisted soil cleaning has been considered as a promising technology for remediating of dye-contaminated soil, but is significantly impeded by limitations such as the adsorption or precipitation of surfactants in soil. To take the advantage of effective remediation of anionic surfactant and lower adsorption of nonionic surfactant, a remediation system has been developed in this study for soil contaminated with model dyes methyl orange and alizarin red, employing a designed anionic-nonionic surfactant known as sodium nonylcyclohexanol ethoxylates sulfate (NCEO 5 S) and a commercial surfactant—sodium alkyl alcohol ethoxylate sulfate (AES). Using simple wash, the elution efficiency on highly-contaminated soil (methyl orange and alizarin red) reached up to 94.34% and 97.66%, respectively, at 25°C in 24 h with 1 wt% of surfactant solution. Electrostatic repulsion noticeably mitigates surfactant adsorption on the soil surface. The low adsorption of surfactants on the eluted soil surface was characterized with SEM-EDS and thermogravimetric analysis. The kinetics of surfactant-enhanced dyes desorption from contaminated soil follow the Elovich equation. The findings will be benefit for developing eco-friendly surfactant systems to clean-up dyes-contaminated soils while minimizing surfactant adsorption. Graphical Schematic diagram of remediation of dye-contaminated soil by surfactant.
研究领域:
环境科学
·
化学工程
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2018
·
IF 11.698
Tingting Huang,Qingyi Peng,Wenjin Shi,Jundong Xu,Yu Fan
This article proposes a novel sodium dodecylbenzenesulfonate (SDBS)-assisted equilibrium adsorption method for preparing highly dispersed Ni/Al 2 O 3 and Fe-promoted NiFe/Al 2 O 3 thioetherification catalysts. The proposed strategy anchors nickel cations onto the electronegative surface of an Al 2 O 3 support modified by negatively charged DBS − bilayers. As a result, this method achieves highly dispersed Ni nanoparticles without strengthening the metal-support interaction, promoting the reducibility and sulfurization of the supported Ni species. The as-prepared Ni-based catalysts have a smaller size, a higher dispersion of metal nanoparticles, and a greater amount of active metal sulfides than their counterparts prepared by the conventional impregnation method, endowing them with excellent catalytic performance for the highly selective removal of mercaptans. This method provides a new opportunity to prepare highly dispersed metal nanoparticles without a strong metal-support interaction.
研究领域:
催化化学
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材料科学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Shasha Jiang,Weilin Qi,Cheng Ma,Tongyue Wu,Xiaoyu Li,Xingyue Chen,Shuitao Gao,Jinwan Qi,Yun Yan,Jianbin Huang
Precipitates occur readily in the aqueous mixture of cationic and anionic surfactants. We report that the precipitates formed in the catanionic surfactant systems at charge ratios deviated from 1:1 can be solubilized by simply increasing the total surfactant concentrations. At higher concentrations, there are vesicles in the supernatant, which will sequester the monomer surfactant in equilibrium with the precipitates. This shifts precipitation-solvation equilibrium continuously. As a result, the precipitates vanish when all the surfactants in the precipitates are taken into the vesicles. In this way, a high-concentration stable phase (HCSP) can be formed in the precipitated surfactant systems, which can be generalized to all catanionic surfactant systems. We envision the concentration-triggered HCSP is very promising in guiding the large-scale application of catanionic surfactants.
研究领域:
化学
·
材料科学
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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）