ChemPlusChem
·
2022
·Vol. 87
·期 1
·e202100491
·
IF 3.21
Ruijie Wang,Pengchang Liu,Xiaoyan Yu,Xinchao Sun,Hua Lai,Zhongjun Cheng
Graphical A mesh film was prepared by coating polypyrrole (PPy) film on Ti mesh , which is underwater superaerophilic when PPy is doped with perfluorooctanesulfonate ions (PFOS − ), and becomes underwater superaerophobic as the PFOS − are removed. The transition of the wettability can be triggered by the electro-stimuli, and adjustable bubble permeation in water is also demonstrated based on the film. Recently, materials with controllable superwettability have attracted much attention. However, almost all studies focused on controlling wetting of water and oil; research on underwater gas bubble wetting control is still rare. Herein, we report a mesh film prepared by coating polypyrrole (PPy) film on Ti mesh. Briefly, the film mesh is underwater superaerophilic when PPy is doped with perfluorooctanesulfonate ions (PFOS − ), and becomes underwater superaerophobic as the PFOS − are removed. The transition of the wettability can be triggered by electrical stimuli, which is attributed to the cooperative effect between the rough structure and chemical components variation. The controllable wettability allows adjustable bubble permeation. It can be envisioned that the film will provide potential applications in the future, such as underwater bubble capture/release and microfluidic devices.
研究领域:
材料科学
·
表面科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Zhaolong Wang,Jinsong Xiong,Yibo Liao,Mingzhu Xie,Dongsheng Yang,Ce Zhang,Yongping Chen,Zhigang Zou
Manipulation of bubbles underwater is attracting a wide range of interests due to the immense potential applications for industry, human health, etc. Inspired by superaerophilic legs of the water strider, a unique type of superaerophilic/aerophobic Janus membrane with precisely controllable geometric parameters and morphologies for unidirectional transportation of bubbles underwater is proposed and fabricated by projection micro-stereolithography (P μ SL) based 3D printing technique. The bionic Janus membranes possess different wettability on their two sides, which enables them stable and ultra-fast unidirectional bubbles transportation underwater. The superhydrophobic microholes forbid the water entering them but provide numerous gas channels, which is dominated by the superaerophilic coating (nano-SiO 2 ). Most significantly, we apply our bionic Janus membranes for the ultra-fast removal of hydrogen bubbles adhering to the copper cathode during the hydrogen evolution reaction (HER). The amazing performance of our 3D printed bionic Janus membranes promises applications in terms of ultra-fast unidirectional gas transportation underwater, such as fast gas–liquid separation, bubble collection, gas removal for chemical reaction, and so on.
研究领域:
材料科学
·
化学工程
·
生物仿生学
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2018
·Vol. 8
·期 1
·1-9
·
IF 4.122
Li Yongfei,Wang Yanling,Wang Kun,Gomado Foster,Wang Gangxiao,Tang Longhao,Rong Xufeng
The wettability of the formation is critical for the flow back of the fracturing fluid and can further affect the gas production. So it is very necessary to study the wettability of shale reservoir. Here, a novel fluorocarbon surfactant, N-ethyl-N-hydroxyethyl perfluorooctanoamide, was synthesized and characterized by different methods. the contact angles of water and n-decane on the shale increased from 36° and 0° to 121° and 105°, respectively, after treated by N-ethyl-N-hydroxyethyl perfluorooctanoamide (0.5 wt.%). The surface free energy reduced from 72 mN/m to 7.4 mN/m. The results agreed with that of imbibition and capillary tube rise test. Additionally, the analysis of scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS) showed that the roughness of shale surface remarkably increased. These results fully proved that the shale wettability is changed to super gas-wetting. Besides, the thermal analysis revealed that the novel fluorocarbon surfactant has good thermal stability. This indicates that it can be better applied to reservoir modifications at higher temperatures.
研究领域:
石油工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Fang Li,Xiaoyang Yue,Lei Cheng,Jiajie Fan,Quanjun Xiang
Inspired by the lotus leaf effect, constructing a hydrophobic surface to endow photocatalysts with underwater aerophilicity, is an effective measure to improve the accessibility of CO 2 on the catalyst surface during CO 2 photoreduction in the liquid phase. Unfortunately, the aerophilic advantages of the material cannot be fully exploited with the extremely low solubility of CO 2 in water. Thus, applying the “hydrophobicity-aerophilicity effect” to gaseous CO 2 atmosphere, that is, proving that the hydrophobic material has aerophilic effect in air, has become a challenge. Herein, a hydrophobic graphitic carbon nitride (g-C 3 N 4 ) photocatalyst modified by CF 2 groups (CF 2 -TCN) is developed to enhance the aerophilicity of the CF 2 -TCN in air. A theoretical model of the gas-phase “hydrophobicity-aerophilicity effect” and the corresponding theoretical support are presented. Experimental characterizations demonstrate that the grafted CF 2 groups create a hydrophobic surface for CF 2 -TCN, acting as a gas transport layer and enhancing the aerophilicity of CF 2 -TCN. Theoretical calculations further explain that the strong electronegativity of F atoms in CF 2 groups affects the electron cloud distribution of g-C 3 N 4 , facilitating the adsorption and activation of CO 2 by CF 2 -TCN. Furthermore, the electron-withdrawing effect of F atoms efficiently extracts electrons, accelerating the intramolecular charge transfer. Benefiting from enhanced aerophilicity and improved electron transfer, the output of CO and CH 4 by CF 2 -TCN are 30.94 and 7.39 μmol·h −1 ·g −1 without any sacrificial agents, far exceeding that of bulk g-C 3 N 4 (BCN) by 5.54 and 18.95 times, respectively.
研究领域:
材料科学
·
环境科学
·
理论化学
✓ 已验证
产品关联
DOI
高影响因子
Science Advances
·
2023
·Vol. 9
·期 3
·
IF 13.6
Chunhui Zhang,Zhe Xu,Nana Han,Ye Tian,Tanja Kallio,Cunming Yu,Lei Jiang
Hydrogen evolution reaction (HER), as an effective method to produce green hydrogen, is greatly impeded by inefficient mass transfer, i.e., bubble adhesion on electrode, bubble dispersion in the vicinity of electrode, and poor dissolved H2 diffusion, which results in blocked electrocatalytic area and large H2 concentration overpotential. Here, we report a superaerophilic/superaerophobic (SAL/SAB) cooperative electrode to efficiently promote bubble transfer by asymmetric Laplace pressure and accelerate dissolved H2 diffusion through reducing diffusion distance. Benefiting from the enhanced mass transfer, the overpotential for the SAL/SAB cooperative electrode at −10 mA cm−2 is only −19 mV, compared to −61 mV on the flat Pt electrode. By optimizing H2SO4 concentration, the SAL/SAB cooperative electrode can achieve ultrahigh current density (−1867 mA cm−2) at an overpotential of −500 mV. We can envision that the SAL/SAB cooperative strategy is an effective method to improve HER efficiency and stimulate the understanding of various gas-involved processes.
研究领域:
电化学
·
能量转换
·
材料科学
·
纳米技术
·
化学工程
✓ 已验证
DOI
高影响因子
Advanced Sustainable Systems
·
2024
·
IF 6.5
Xu Chen,Yingjie Wen,Yuechu Wang,Li Yi,Hao Yang,Zhiyi Lu
Heterogeneous catalysts for catalytic ozonation are elaborately designed with commendable intrinsic activity, while their industrial applications are limited by inadequate mass transfer of ozone (O 3 ). In this work, it is demonstrated that engineering the surface aerophilicity of heterogeneous catalyst enables fast mass transfer of O 3 reactant, giving rise to much enhanced catalytic ozonation performance. Taking active 4A zeolite catalyst as an example, the aerophilicity of spherical 4A zeolite can be greatly enhanced by coating polytetrafluoroethylene (PTFE) with low surface energy, and the optimized sample exhibits a 99.5% removal of atrazine (ATZ) within 20 min (corresponding to a k of 0.269 min −1 ), much better than 4A zeolite without surface aerophilicity engineering ( k ≈0.156 min −1 ). The PTFE coating does not change the ozone activation mechanism and degradation pathways for ATZ, further demonstrating that the enhanced ozonation activity is attributed to the enhanced mass transfer process. In addition, the general applicability of this surface aerophilicity and the potential ozonation application for industrial wastewater treatment are both demonstrated.
研究领域:
环境科学
·
催化
·
化学工程
·
水处理
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）