JOURNAL OF CHEMICAL THERMODYNAMICS
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2016
·
IF 2.196
Dong Fu,LeMeng Wang,XiangFeng Tian
The surface tension (γ) of 1-dimethylamino-2-propanol (DMA2P), DMA2P-monoethanolamine (MEA), and DMA2P-piperazine (PZ) aqueous solutions was measured by using the BZY-1 surface tension meter. The temperature ranged from 303.2 K to 323.2 K. The mass fractions of DMA2P, MEA and PZ respectively ranged from 0.30 to 0.50, 0.05 to 0.15 and 0.025 to 0.075. An equation was proposed to model the surface tension and the calculated results agreed well with the experiments. The surface thermodynamics including surface enthalpy and surface entropy were determined and their concentration dependence was analysed.
研究领域:
物理化学
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热力学
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表面科学
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产品关联
DOI
高影响因子
JOURNAL OF SURFACTANTS AND DETERGENTS
·
2019
·Vol. 22
·期 6
·1331-1342
·
IF 1.672
Juan Wu,Ping Mei,Wu Chen,Zhong-Bao Li,Qing Tian,Qi-Xiang Mei
As a class of novel surfactants, Gemini surfactants usually exhibit fairly excellent interfacial properties in aqueous solutions on account of the unique structure. They have significant application and development potential for industrial production. However, the mixing properties of Gemini surfactants with conventional surfactants are the key to their application. The equilibrium surface tension curves of anionic/nonionic surfactant mixtures based on the sulfonate Gemini surfactant (SGS-12) were measured using the Wilhelmy Plate method. The parameters of surface adsorption, the interaction parameters between anionic and nonionic surfactants, and the thermodynamic parameters of micelle formation were calculated from the corresponding equations. In addition, the dynamic surface tension (DST) curves of anionic/nonionic surfactant mixtures were examined through bubble profile analysis, and the diffusion performance parameters were acquired from empirical formulas. The solubilization of pyrene in micelle solutions was studied using UV–vis absorption spectroscopy. The results show that the interaction parameters of all anionic/nonionic surfactants are negative, indicating that there is a synergistic effect on reducing the surface tension. For the SGS-12/OP-10, SGS-12/Tween 80, SGS-12/AEO9, and SGS-12/APG0810 mixtures, the optimum mixing ratios are 6:4, 7:3, 7:3, and 8:2, respectively. The thermodynamic data of micelles show that the formation of mixed micelles for SGS-12/APG0810 mixtures is an enthalpy-driven process. The tendency of DST curves of the SGS-12/APG0810 mixture is similar to that of SGS-12. In comparison with single-surfactant solutions, the anionic/nonionic surfactant mixtures show stronger solubilization capacity toward pyrene. Graphical
研究领域:
化学工程
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界面科学
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产品关联
DOI
高影响因子
SOLAR ENERGY
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2025
·
IF 6.6
Wuzhi Yuan,Huaming Li,Jiechao Chen,Ya Ge,Liehui Xiao,Si-Min Huang
Solar energy offers a promising and sustainable alternative to traditional energy. However, surface soiling can reduce the efficiency of PV panels dramatically. In this paper, we investigate the continuous droplets impacting on dusty surfaces to achieve surface cleaning. The effects of surface wettability, dust types, water volume, and surfactants on the dynamic behavior and macroscopic efficacy of droplet dust removal are analyzed. For distilled water, the superhydrophilic surface achieves the best dust removal with transmittance recovering to 96 % of a clean surface, while the hydrophilic surface is worst. Notable water channels are observed on the hydrophilic surface, which results in a significant contrast in surface transmittance between the interior and exterior of these channels, 90 % and 73 %, respectively. The overall dust-removal performance on the surface is rather poor, and a large amount of water resources are wasted. Interestingly, surfactants solution can disrupt the water channels on the hydrophilic surface relying on sequential sliding and bouncing, thus enhancing the dust removal efficiency. It is found that anionic surfactant (AS) solution demonstrates the optimal performance. The relative dust removal mass is just 48 % using 5 ml water, while it increases to 84 % for AS0.5. This is attributed to the repulsive forces between the negatively charged dust and molecules of anionic surfactant. This finding helps to the self-cleaning applications of water droplet impacting for PV modules.
研究领域:
能源科学
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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
Friction
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2022
·Vol. 11
·期 4
·513-523
·
IF 4.924
Gao Tianyang,Li Jinjin,Wang Weiqi,Luo Jianbin
An extremely low friction state was observed on the gold surface induced by applying a specific negative potential in cationic surfactant solution. The friction force showed a remarkable reduction from 8.3 to 3.5 × 10 −2 nN (reduced by 99.6%) with increasing the period of negative applied potential, and the final friction coefficient could reduce down to 3 × 10 −4 . The extremely low friction state was robust, and it also exhibited an excellent load bearing capacity, which cannot be damaged by a high load. Moreover, the extremely low friction state achieved under negative applied potential could keep stable even after the removal of potential, but failed in a short time, once a specific positive potential was applied. It was demonstrated that there was a stable electro-adsorption of surfactant molecules on the gold surface induced by applying a negative potential, leading to the formation of a bilayer structure on the gold surface. The hydration layers of the bilayer on the gold surface and micelles on the silica probe provided a shear plane with an extremely low shear strength, leading to the extremely low friction state on the gold surface. This study provides a method to achieve extremely low friction state by applied potential.
研究领域:
材料科学
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界面化学
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DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2017
·
IF 3.648
Jialin Xie,Fang Wang,Dong Fu
The surface tensions (γ) of 2-diethylaminoethanol (DEAE)–tetramethylammonium glycinate ([N 1111 ][Gly]), DEAE–1-butyl-3-methylimidazolium glycinate ([Bmim][Gly]) and DEAE–1-butyl-3-methylimidazolium l -lysinate ([Bmim][Lys]) aqueous solutions were measured by using the BZY-1 surface tension meter. The temperature ranged from 303.2 K to 323.2 K. The mass fractions of DEAE and amino acid ionic liquids (AAILs) respectively ranged from 0.30 to 0.50 and 0.025 to 0.075. A thermodynamic equation was proposed to model the surface tension and the calculated results agreed well with the experiments. The effects of temperature and mass fractions of DEAE and AAILs on the surface tension were demonstrated on the basis of experiments and calculations. The surface enthalpy and surface entropy were determined and their concentration dependences were illustrated.
研究领域:
物理化学
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表面科学
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产品关联
DOI
高影响因子
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
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2016
·
IF 1.914
Kun Shan,Ping Zhou,Yunsheng Zuo,Renke Kang,Dongming Guo
Electrogenerated chemical polishing (EGCP) had been proved effective in improving both the smoothness and the flatness of copper surface in our previous work. In this paper the polishing ability, defined as the ratio between the material removal rate at the peak and at the valley of a rough surface, is studied theoretically and experimentally. In a mathematical model, the effects of the special wavelength L , the peak-to-valley height h of the workpiece surface profile and the working distance d between working electrode and workpiece surface on the polishing ability are studied. The results show that the polishing ability decreases with increasing the working distance and finally approaches the value ( d + h )/ d , if L is much larger than d . However, the effect of the working distance on polishing ability is negligible, if L is close to or less than d . The polishing ability also decreases with h decreasing. Based on the above analysis, an analytical expression of the polishing ability of EGCP is given. For validating the theoretical analysis, a copper surface is polished by EGCP and the change of the surface profile is measured and analyzed using the analytical expression. The measured polishing ability agrees well with the simulation results.
研究领域:
材料科学
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表面工程
·
电化学
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DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2019
·
IF 2.298
Lemeng Wang,Xiangfeng Tian,Chi Fang,Hao Huang,Dong Fu,Yuheng Quan
In this work, the surface tensions (γ) of the aqueous blends of 1-dimethylamino-2-propanol (DMA2P) + amino acid ionic liquids (AAILs) were studied using the Wilhelmy plate method at temperatures from 303.2 to 323.2 K and atmospheric pressure. The AAILs include tetramethylammoniumglycinate ([N1111][Gly]), 1-butyl-3-methylimidazolium glycinate ([Bmim][Gly]), and 1-butyl-3-methylimidazolium-l-lysinate ([Bmim][Lys]). The concentrations of DMA2P and AAILs were varied between 0.300 and 0.500 wt % and 0.025 and 0.075 wt %, respectively. A thermodynamic correlation approach with respect to the mass fraction and temperature was employed to correlate the surface tension of DMA2P–AAILs aqueous solutions. The surface entropy (SS) and surface enthalpy (HS) were calculated from the analytical formulation, and their variation with mass fraction and temperature was demonstrated. The effects of the types of AAILs on the surface properties were also analyzed and compared.
研究领域:
物理化学
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材料科学
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DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 7
·1202
·
IF 5.719
Zhenming Wang,Jianxun Liu,Jiawei Wang,Zongjun Ma,Delai Kong,Shouzhen Jiang,Dan Luo,Yan Jun Liu
Surface-enhanced Raman spectroscopy (SERS) has long been an ultrasensitive technique for trace molecule detection. However, the development of a sensitive, stable, and reproducible SERS substrate is still a challenge for practical applications. Here, we demonstrate a cost-effective, centimeter-sized, and highly reproducible SERS substrate using the nanosphere lithography technique. It consists of a hexagonally packed Ag metasurface on a SiO2/Au/Si substrate. A seconds-lasting etching process of a self-assembled nanosphere mask manipulates the geometry of the deposited Ag metasurface on the SiO2/Au/Si substrate, which attains the wavelength matching between the optical absorbance of the Ag/SiO2/Au/Si substrate and the excitation laser wavelength as well as the enhancement of Raman signals. By spin-coating a thin layer of graphene oxide on the substrate, a SERS performance with 1.1 × 105analytical enhancement factor and a limit of detection of 10−9M for melamine is achieved. Experimental results reveal that our proposed strategy could provide a promising platform for SERS-based rapid trace detection in food safety control and environmental monitoring.Keywords:SERS;self-assembly;metasurface;surface plasmon;hot spot;sensitivity
研究领域:
分析化学
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材料科学
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食品安全
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环境科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Qianhui Cheng,Dayang Wang
Hypothesis Integration of ultralow surface energy and surface functionality on one surface coatings is highly desirable in chemical and biomedical applications. However, it is a fundamental challenge to reduce surface energy without cost of surface functionality and vice versa. To address this challenge, the present work made use of the rapid and reversible change of surface orientation conformations of weak polyelectrolyte multilayers to create ionic, perfluorinated surfaces. Experiments Poly(allylamine hydrochloride) (PAH) chains and the micelles of sodium perfluorooctanoate (SPFO) were layer-by-layer (LbL) assembled into (SPFO/PAH) n multilayer films , which readily exfoliated to freestanding membranes. The static and dynamic surface wetting behaviors of the resulting membranes were studied by sessile drop technique and their surface charge behaviors in water by electrokinetic analysis. Findings As-prepared (SPFO/PAH) n membranes exhibited ultralow surface energy in air; the lowest surface energy is 2.6 ± 0.5 mJ/m 2 for PAH-capped surfaces and 7.0 ± 0.9 mJ/m 2 for SPFO-capped surfaces. They readily became positively charged in water, which allowed not only effective adsorption of ionic species for further functionalization with subtle change in surface energy, but effective adhesion onto various solid substrates such as glass, stainless steel , and polytetrafluoroethylene to endorse the wide applicability of (SPFO/PAH) n membranes.
研究领域:
材料科学
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化学工程
·
生物医学工程
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产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Lizhi Zhao,Xiaofu Wang,Lixian Wang,Shuhao Chen,Guangyue Du,Baitao Xu,Hui Ye,Qingping Xin,Yuzhong Zhang
The scarcity of freshwater resources has emerged as a significant challenge for humanity. Fog harvesting, a process that converts atmospheric fog into readily accessible water, presents a promising solution. However, the surfaces currently developed for fog collection still face the problems of low efficiency and poor stability. To address these issues, this study designed a biomimetic hydrophobic slippery-superhydrophilic (SLIPS-SHPH) patterned surface. The surface was fabricated by a masked spray coating and lubricant infusion. By refining the pattern design, the wedge-shaped SHPH patterns, with a smaller size and an optimized total area ratio to SLIPS in a dispersed arrangement, were created. The SLIPS-SHPH integrates beetle- and cactus-spine-inspired SHPH patterns for fog accretion/droplet motion and pitcher-plant-mimicking SLIPS for droplet delivery/detachment. This synergy enables an efficient cycle of “fog capture-droplet transport-droplet release”, and achieves a water collection efficiency of 2462 mg·h–1·cm–2, 1.75 times that of the homogeneous hydrophobic surface. Notably, the SLIPS-SHPH patterned surface demonstrates excellent stability over a 120 h testing period owing to the stable water repellence of SLIPS. The research on the multilevel biomimetic strategies and pattern regulation provides a feasible way for efficient and sustainable fog collection.
研究领域:
环境科学
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材料科学
·
仿生学
·
表面工程
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产品关联
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2019
·Vol. 21
·期 28
·15705-15711
·
IF 3.567
Nan Wang,Lingling Tang,Yingfeng Cai,Dangsheng Xiong
Slippery surfaces were prepared by infusing lubricant into smooth or hierarchical-structured superhydrophobic surfaces (SHS) to compare different surface-free energies. The surfaces obtained showed good repellency towards liquids with various values of surface tension/molecular polarity/viscosity, including hexane, tetradecane, water, ethylene glycol and viscous engine oil. The lyophobicity could be realized on a relatively smooth surface, indicating that the first principle of preparing a lyophobic slippery surface is to perform a low surface-free energy modification. The dynamic liquid repellency was also studied: the sliding speeds of different liquids on lubricant infused SHS showed a negative correlation to their kinematic viscosity values, and a higher surface roughness was favorable for dynamic wettability, whereas for the smooth slippery surface, the travelling speeds showed randomness.
研究领域:
材料科学
·
界面化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2022
·
IF 5.895
Fang Fu,Yulin Fan,Langqiu Chen,Jing Zhang,Jiping Li,Jingyi Liao,Guochao Zhang
A series of nonionic disaccharide-based surfactants alkyldi(oxyethylene) β-d-maltosides (4a–4h, n = 6–16) were synthesized, and their physicochemical properties were further investigated. Six β-D-maltosides (4c–4h, n = 8–16) exhibited a fan-shaped texture feature, whereas hexyldi(oxyethylene) β-D-maltoside (4a) had the strongest hygroscopicity. Owing to the incorporation of the hydrophilic dioxyethyl spacer (−(OCH2CH2)2−), the related water solubility improved significantly. Tetradecyldi(oxyethylene) β-D-maltoside (4g) had good water solubility, whereas hexadecyldi(oxyethylene) β-D-maltoside (4h) had weak water solubility. Meanwhile, the surface tension of β-D-maltosides (4a–4g, n = 6–14) had a decreasing tendency with increasing the alkyl chain length, whereas 4g had the best surface activity. Furthermore, decyldi(oxyethylene) β-D-maltoside (4e) had the best foaming ability and foam stability. Dodecyldi(oxyethylene) β-D-maltoside (4f) had the best emulsifying property in the rapeseed oil/water system. In contrast, both ammonium dodecyl sulfate (NH4DS)/4f and cetyltrimethylammonium chloride (CTAC)/4f binary surfactant systems showed a synergistic effect in surface activity because the CCMC/CMCidmix was <1. NaCl impacted the surface activity of the aqueous 4f solution through salt–surfactant synergistic effects. The results showed that such surfactants should have potential applications in the related field in the future.
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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产品关联
DOI
PubMed
高影响因子
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