ACS Applied Nano Materials
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2018
·
IF 0
Jinjin Li,Zengpei Dou,Yuhong Liu,Jianbin Luo,Jinxin Xiao
Although surfactant micelles usually exhibit superlow friction at the nanoscale due to the formation of the hydration layer, the load-bearing capacity (LBC) is limited. In this study, the friction behaviors of two different surfactant micelles (fluorinated and hydrocarbon surfactants, denoted as F-surfactant and H-surfactant) were compared, with the results showing that both can achieve superlow friction (μ = 0.001–0.002) when the self-assembled micelle layers on the two surfaces were not ruptured. Although the two different surfactant micelles have the similar friction behaviors, the LBC of superlow friction for the F-surfactant is 2.5 times larger than that for the H-surfactant. The mechanisms of the superlow friction and the reasons for different LBC were investigated using an atomic force microscopy. The superlow friction can be attributed to the formation of hydration layer on the surfactant headgroups, whereas the higher LBC for F-surfactant originates from the fatness of its carbon chain, which produces the larger hydrophobic attraction and meanwhile increases the stiffness of the micelle layer.
研究领域:
材料科学
·
纳米技术
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产品关联
DOI
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 41
·17791-17814
·
IF 3.288
Hany M. Abd El-Lateef,K. Shalabi,Ahmed H. Tantawy
The facile synthesis approach, surface-active properties, and anti-corrosive efficiency of innovative urea-based cationic fluorinated surfactants (FUS) of variable alkyl chain length were investigated. The effect of as-prepared FUS inhibitors on carbon steel corrosion in 15% HCl solution at 20–50 °C was examined using weight loss and various electrochemical methods (open circuit potential (OCP) vs. time, potentiodynamic polarization (PDA) and electrochemical impedance spectroscopy (EIS) methods). The corrosion protection capacities at an optimum concentration (0.5 mM) are 93.2% (FUS-8), 96.3% (FUS-10) and 97.6% (FUS-12) by PDA, comparable to the findings achieved by EIS. PDA measurements indicated that the studied FUS act as inhibitors of mixed-type and chemical adsorption on a carbon steel interface following the Langmuir isotherm model. The thermodynamic and kinetic indices of the corrosion and adsorption processes were estimated and interpreted. Surface examinations by X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared spectroscopy (FTIR), field emission scanning electron microscopy and energy dispersive X-ray analysis (FESEM/EDX) revealed the formation of a protecting layer at the carbon steel/HCl interface. Quantum chemical indices (DFT based) delivered more understanding of the inhibition mechanism. Molecular dynamics (MD) simulations were accomplished to explore the configurational adsorption performance of the studied fluorosurfactants on the iron(110) interface. It is supposed that these findings are of some significance for the reasonable design of effective inhibitors for acidic corrosion.
研究领域:
材料科学
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电化学
·
计算化学
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DOI
高影响因子
ACS Applied Materials & Interfaces
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2021
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IF 9.229
Guangyao Cheng,Kuan-Ting Lin,Yinghua Ye,Hang Jiang,To Ngai,Yi-Ping Ho
The past decade has witnessed a significant development of droplet microfluidics for applications such as directed evolution and single-cell analysis. While the stability and manipulation of droplets are part of the prerequisites to further their applications, most of the currently available surfactants serve solely as stabilizers between the interfaces of water and oil. In this study, we present a novel type of photo-responsive fluorosurfactant based on fluorinated plasmonic nanoparticles (NPs). The demonstration by fluorinated gold–silica core–shell NPs (f-Au@SiO2) has been shown to be effective in stabilizing the water-in-fluorocarbon oil droplets. More importantly, the photothermal response enabled by the f-Au@SiO2 has been shown to be promising for the movement of droplets as well as the alteration of interfacial stability. The unique photo-responsiveness provided by the plasmonic NPs is expected to gear up the droplet microfluidics with an “active” surfactant for reconfigurable optical manipulation.
研究领域:
材料科学
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化学工程
·
微流控技术
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DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Guangyu Zeng,Chuanrong Zhong,Xiangcheng Wang,Xigao He,Enzhe Pu
A new Gemini hybrid surfactant DFCS was prepared to improve salt resistance and interface activity of fluorinated surfactants. This surfactant was expected to be used as a cleanup additive in fracturing and an active agent in water flooding for shale and superlow-permeability sandstone reservoirs. At high salinities, it displayed lower interface tensions than current fluorinated surfactants as well as the obvious non-wettability of water on glass, and the modified natural sandstone surface using DFCS was close to intermediately wetting for the water and oil phases. Also, DFCS exhibited good temperature resistance, and the surface and interface tensions reduced markedly with the temperature below 70 ℃ in water and brine. For DFCS, the molecular area was large, e.g. A CMC = 129.61 Å 2 at 30 °C; the micelle formation was entropy-driven, and the spontaneity was stronger than that of reported hybrid surfactants with single −SO 3 − ion. The TEM observation showed that the diameters of mono-molecules and micelles were respectively 3–5 and 20–30 nm for 1.9 g/L (CMC) DFCS in water. It was found by the UV data that the non-polarity in micellar micro-domains was visibly weaker for Gemini hybrid surfactants in comparison to hydrocarbon surfactants and that salt hardly influenced the sizes of their micelles, resulting in good salt resistance.
研究领域:
石油工程
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界面化学
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材料科学
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DOI
高影响因子
Theoretical and Experimental Chemistry
·
2023
·Vol. 59
·期 1
·66-74
·
IF 1
Xu Yuan,Jing Xianwu,Zhou Lang,Tang Yongfan,Xiao Yongjun
The formation heats for a number of gemini fluorocarbon surfactants have been estimated using density functional theory (DFT), the values of air/water interface formation energies (IFE) have been compared. It is shown that the fluorocarbon surfactants can efficiently reduce the surface tension of the air/water interface. One of the representatives of the surfactants, possessing the highest IFE value (in absolute value), has been prepared and its critical micelle concentration and the corresponding surface tension have been experimentally determined.
研究领域:
化学
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材料科学
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
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IF 3.8
Zihan Liu,Chaojie Li,Zhiru Yuan,Weiwei He,Lifen Zhang,Zhenping Cheng
A fluorinated surfactant exhibits extremely high surface activity and is the key component of the aqueous film-forming foam (AFFF) extinguishing agent. Unfortunately, the long fluorinated carbon chain has been proven to be bioaccumulative and has been banned internationally. This study aims to design and synthesize Y-shaped surfactants based on short fluorocarbon chains through atom transfer radical addition (ATRA), while maintaining the excellent performance as that with a long fluorocarbon chain. A minimum surface tension of 13.5 mN/m for (FC6HC6)2-CHOSO3Na can be reached with even a quite low concentration (0.04 g/L) according to a surface activity test, satisfying the performance requirements of the surfactant used for AFFF extinguishing agent. Moreover, the aqueous solution on the oil spreads out rapidly (<0.5 s), with a large spreading area of 2.89 cm2. In addition, an AFFF extinguishing agent formula based on the synthesized fluorinated surfactant is successfully obtained, whose foam production fulfills the requirements of the national standard of a fire-extinguishing agent (GB 15308-2006). In subsequent fire extinguishing tests, this extinguishing agent behaves successfully. To sum up, the Y-type surfactant is a degradable surfactant, which can be used as an AFFF extinguishing agent with excellent performance, highly promising in practical application.
研究领域:
化学工程
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材料科学
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环境科学
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产品关联
DOI
高影响因子
LAB ON A CHIP
·
2021
·Vol. 21
·期 18
·3412-3419
·
IF 6.799
Chuanfeng An,Yujie Zhang,Hanting Li,Haoyue Zhang,Yonghao Zhang,Jiamian Wang,Yang Zhang,Fang Cheng,Kai Sun,Huanan Wang
Droplet microfluidics has recently emerged as a powerful platform for a variety of biomedical applications including microreactors, bioactive compound encapsulation, and single cell culture and analysis; all these applications require long-term droplet stability, which, however, makes breaking the emulsion and retrieving the loaded samples difficult. Herein, we developed a novel class of thermo-responsive fluorosurfactants to control the droplet status simply by temperature. The surfactants were synthesized by coupling perfluorinated polyethers (PFPEs) with a thermo-responsive block of poly(N-isopropylacrylamide) (pNIPAM) or poly(2-ethyl-2-oxazoline) (pEtOx) with lower critical solution temperature (LCST). These diblock surfactants can stabilize the emulsion at temperatures below LCST due to the hydrophilic head, which became hydrophobic upon increasing the ambient temperature above LCST, thereby destabilizing the droplets and realizing demulsification simply via temperature control. The diblock surfactant can be applied for templating cell encapsulation using alginate microgels, which allowed one-step and high-throughput microfluidic generation of cell-laden microgels without compromising cell viability. This non-invasive, on-demand demulsification strategy provides a high degree of freedom for microencapsulation and on-demand recovery of the samples or reaction products within the droplets, which opens a new avenue for a wide range of applications of droplet-templating microfluidics.
研究领域:
微流控技术
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材料科学
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生物医学工程
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化学工程
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产品关联
DOI
PubMed
高影响因子
COLLOID AND POLYMER SCIENCE
·
2020
·Vol. 298
·期 8
·1013-1021
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IF 1.536
Li Yuwei,Lian Ruili,Wang Xinmin,Liu Yonglu
Although ionic liquids have been studied as self-assembly media, the aggregation of fluorinated surfactants in ionic liquids has not been fully understood. In this work, the aggregation behavior of the fluorinated surfactant, N-ethylperfluorooctane sulfonamide (N-EtFOSA), in the aprotic ionic liquid, 1-ethyl-3-methylimidazolium ethylsulfate ([C 2 mim][EtSO 4 ]), was studied using surface tension, 19 F-NMR, dynamic light scattering (DLS), and cryo transmission electron microscopy (cryo-TEM). The surface properties and thermodynamic parameters were calculated based on the results of surface tension measurements. It was found that the fluorinated surfactant exhibits a considerable surface activity in aprotic ionic liquids, and its critical micelle concentration (cmc) increases with increasing temperature. In addition, the surface properties indicate that solvophobic interactions are the main driving force for micelle formation. The thermodynamic parameters for micelle formation derived from the temperature dependence of the cmc revealed that micelle formation is an enthalpy-driven process. DLS and cryo-TEM results indicated the presence of nanoscale micelles in the N-EtFOSA + [C 2 mim][EtSO 4 ] system. The results of this work imply that this fluorinated surfactant exhibits a more pronounced surface activity than conventional hydrocarbon surfactants in [C 2 mim][EtSO 4 ].
The self-assembly of fluorinated surfactants in aprotic ionic liquids
研究领域:
化学
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材料科学
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界面科学
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DOI
高影响因子
JOURNAL OF SUPERCRITICAL FLUIDS
·
2017
·
IF 2.991
Lei Bao,Shuyi Fang,Dongdong Hu,Yuan Zong,Ling Zhao,Weikang Yuan,Tao Liu
Several amphiphilic nonfluorinated polymers, poly(vinyl acetate)-block-poly(dimethylaminoethyl methacrylate) (PVAc -b- PDMAEMA) and poly(vinyl acetate- alt -diethyl maleate) (PVDBM) -b- PDMAEMA with different ratios of CO 2 -philic and hydrophilic groups, were synthesized using RAFT/MADIX polymerization and ATRP. Stability measurements revealed that PVDBM 8 -b- PDMAEMA 22 could emulsify 80% CO 2 in H 2 O, with stable CO 2 -in-water (C/W) emulsions observed for more than 48 h under 20.0 MPa at 25 °C, which was 20 times longer than PVAc -b- PDMAEMA did. The optimal degree of polymerization (DP) for CO 2 -philic groups in PVDBM- b -PDMAEMA was 8, because increasing the DP of PVDBM increased the CO 2 -philicity, whereas increased molecular weight limited the miscibility in water. Molecular dynamics simulations were applied to determine the hydrophilic/CO 2 -philic balance (HCB). It was found that enhanced CO 2 -philic tails widened the HCB range, and the optimal range of the HCB was varied with CO 2 -philic tail types. Both experimental and simulation results demonstrated that enhancing the CO 2 -philicty of surfactant tails can improve the stability of C/W emulsions.
研究领域:
材料科学
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化学工程
·
高分子化学
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DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2019
·
IF 4.561
Yichao Shen,Yong Jin,Shuangquan Lai,Liangjie Shi,Weining Du,Rong Zhou
Developing suitable alternatives to long fluoroalkyl chain surfactants has drawn considerable attention on account of the concerns over the environmental safety and human health. However, low surface activity, poor water solubility and complex preparation process of most currently reported alternatives restrict their widespread applications. Herein, a series of nonionic urethane fluorinated surfactants (F m EG n F m ) were synthesized by one-pot method using poly (ethylene glycol) (PEG), isophorone diisocyanate (IPDI) and short chain fluorinated alcohol as raw materials. The surfactant molecule is composed of two short fluoroalkyl chains connected to a PEG molecule via two IPDI spacers. Benefit from the special molecular structure design, these fluorinated surfactants displayed high surface activities, which could reduce the surface tensions of 17.8–28.7 mN/m and had low critical micelle concentrations of 0.17–0.98 mmol/L. These fluorinated surfactants showed good salt and pH resistance. Furthermore, contact angle and emulsifying experiments demonstrated that these fluorinated surfactants possessed excellent wetting and emulsifying properties at an extremely low concentration of 0.1 wt%. More importantly, the cytotoxicity experiment verified that these fluorinated surfactants had no obvious cytotoxicity. The ideal properties coupled with a simple and green preparation process make this strategy a new avenue to fabricate sustainable alternatives to long fluoroalkyl chain surfactants.
研究领域:
材料科学
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化学工程
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环境科学
·
毒理学
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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）