COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
·
IF 4.539
Zewei Zhao,Zhiguang Wu,Sven Rutkowski,Sergei I. Tverdokhlebov,Johannes Frueh
Micropumps are in animal and human bodies and on cellular levels vital for the life functions. In case of critical problems like diseases, artificial micropumps are candidates to take over important functions. These functions are ranging from release of substances over removing toxics to stirring stomach fluids, helping to disperse medicine. We hereby present a Janus micropump, powered by hydrogen bubbles, which is able to operate in a gastric pH environment. This Janus micropump consumes hydrochloric acid as an external fuel and releases magnesium ions , which act as micronutrients . The presented Janus micropumps do display significant pumping power by moving external tracer particles and stop after exhausting their magnesium or alternatively acid fuel. The pumping properties depend significantly on the surrounding pH environment and the amount of external surfactant added. Analysis of tracer particle motion shows, that the cause of this movement are the bubbles generated that drag the liquid along after bubble release.
研究领域:
生物医学工程
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材料科学
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DOI
高影响因子
Surface Topography-Metrology and Properties
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2022
·Vol. 10
·期 4
·045004
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IF 2.185
Fuliang Ma,Luli Shen,Zhixiang Zeng
In recent years, the development of the slippery liquid-infused porous surface (SLIPS) for metal corrosion protection has attracted extensive attention. The current construction method of SLIPS micro-nano structure has certain limitations. In this paper, a porous structure was firstly constructed by electroplating nickel based on the hydrogen bubble template method, and then the porous structure was modified by 1H, 1H, 2H, 2H-perfluorodecyltriethoxysilane (PFDS) to obtain the superhydrophobic coating, and finally, The SLIPS coating was obtained by infusing perfluoropolyether (PFPE) on the basis of superhydrophobic coating. After immersed in 3.5 wt% NaCl solution for 4 weeks, the WCA of SLIPS constructed in this paper only decreased from 121° to 114°. Importantly, the corrosion resistance of SLIPS was enhanced by one and three orders of magnitude compared with SHC and Cu substrate. In addition, it was worth mentioning that the SLIPS also exhibited a superior self-healing property even after several scratching healing cycles. The simple method of building porous structures in this paper will promote the further development of the SLIPS coating and its application in engineering.
研究领域:
材料科学
·
腐蚀与防护
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DOI
高影响因子
Journal of Cleaner Production
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2024
·
IF 9.7
Teng Lu,Zhaomin Li,Liping Du
Within the broader strategy of deep decarbonization, hydrogen stands out as an emerging energy vector poised to influence various sectors. Recognizing that its role is in development and not yet fully realized, our research focuses on the transitional use of depleted oil reservoirs for hydrogen storage and enhanced oil recovery (EOR). While these reservoirs are not geologically superior for hydrogen storage, their established containment capabilities and existing infrastructure offer dual benefits and economic incentives through the valorization of residual oil. To circumvent the limitations of conventional hydrogen injection, such as poor sweep efficiency and premature breakthrough, we propose the use of high-viscosity hydrogen foam. Our experimental data reveals that such foam can significantly enhance oil recovery by 17.95% and increase storage efficiency to 36.2%. These improvements underscore the foam's ability to control hydrogen mobility and optimize sweep efficiency within heterogeneous geological formations. These findings suggest that high-viscosity hydrogen foam could significantly improve the effectiveness of depleted reservoirs for both energy storage and the recovery of residual oil. Looking forward, it is crucial to investigate the long-term integrity of subsurface hydrogen storage, the transition from laboratory to field-scale applications, and the environmental consequences to ensure that this approach is sustainable. Our study serves as an incremental step in recognizing the integral role hydrogen could play in achieving a decarbonized energy future.
研究领域:
石油工程
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能源科学
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环境科学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2021
·
IF 9.229
Yanfang Shen,Jiannan Pan,Xinyue Hu,Hui-Min Wen,John Q. Xiao,Jun Hu
Nanowire arrays can be conveniently fabricated by electrodeposition methods using porous anodized alumina oxide templates. They have found applications in numerous fields. Nanotube arrays, with their hollow structure and much enhanced surface-to-volume ratio, as well as an additional tuning parameter in tube wall thickness, promise additional functions compared with nanowire arrays. Using a similar fabrication method, we have developed a facile and general method to fabricate metallic nanotubes (NTs). Using Ni NTs as a model system, the mechanism of the hydrogen-assisted NT growth was postulated and confirmed by controlling the hydrogen formation with conductive salts in an electrodeposition solution, which improves the H2 concentration but prevents the large H2 bubbles from blocking the nanochannel of a template. The controlled hydrogen generation forces the growth along the wall of nanochannels in the templates, leading to the NT formation. The magnetic properties can be controlled by the NT wall thickness, making these NTs useful for various applications.
研究领域:
材料科学
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Nan Gao,Ziqi Xu,Yanjie Xue,Xiaoying Liu,Yunpeng Wang,Haitao Ma
This paper systematically conducted a study on the microstructural evolution of tin foam prepared by the hydrogen bubble dynamic template (HBDT) under key deposition parameters, and established a growth model for three-dimensional (3D) porous tin foam based on the coupled effects of competitive reduction reactions and interface regulation. By exploring the competitive relationship between hydrogen evolution and metal deposition, a novel mechanism was proposed for the hydrogen bubble template, revealing the dual role of hydrogen bubbles in metal deposition under the coupling of tin ion concentration and deposition potential. It was also elucidated that the competitive equilibrium between hydrogen evolution and tin ion reduction was crucial for sustaining the dynamic stability of the bubble template, ultimately inducing the formation of 3D porous structures. In addition, the correlation between pore structures (pore size and density) and bubble behavior was deeply discussed to gain a comprehensive perspective. Therefore, this study holds significant importance for guiding the research on customizing the 3D porous tin foam structures in controlled crystallization reactions.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Jiacheng Guo,Xingwu Guo,Jiyong Zeng,Lewen Nie,Jie Dong,Liming Peng,Wenjiang Ding
The purpose of this study is to prepare porous Zn-Ni coating with high infrared emissivity at a lower current density (1 A/cm 2 ) by using dynamic hydrogen bubble template (DHBT) method. Three types of ceramic micro-particles (Al 2 O 3 , SiO 2 and TiO 2 ) are introduced into the electrolyte to investigate their effects on the surface morphology and infrared emissivity of Zn-Ni coating. The results show that uniform porous coatings can be obtained when these micro-particles are added into the electrolyte. The suspended micro-particles in electrolyte can prevent the H 2 bubbles from rising up and escaping from the cathode, which is beneficial to the formation of porous structure, especially the insulating micro-particles, Al 2 O 3 and SiO 2 . The uniform porous structure containing ceramic micro-particles is beneficial to improve infrared emissivity. In addition, the infrared emissivity of porous composite coating is also significantly dependents on the type of ceramic particles inside pores. Among the three types of micro-particles, TiO 2 micro-particles have the greatest effect on the improvement of infrared emissivity which is increased from 0.83 to 0.91 when TiO 2 micro-particles are deposited into the Zn-Ni coating.
研究领域:
材料科学
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表面工程
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产品关联
DOI
高影响因子
DALTON TRANSACTIONS
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2022
·Vol. 51
·期 25
·9681-9688
·
IF 4.569
Yucheng Dong,Shan Ji,Hui Wang,Vladimir Linkov,Rongfang Wang
Metal substrates are frequently used as current collectors and supports for electrochemically active materials, but their effect on the physical and electrochemical performance of electrocatalysts is rarely investigated. In this study, the electrodeposition method was used to coat four different metal meshes with three-dimensional nickel porous structures using hydrogen bubbles as a template. The significant influence of the metal substrates on the morphology of deposited nickel was demonstrated. 3D porous structures formed on nickel, iron, copper, and titanium meshes via the hydrogen bubble template method varied significantly. It was found that differences in the physical adsorption of hydrogen and electrochemical hydrogen evolution on metal substrates are the fundamental reasons behind the diverse morphology of the coatings. Lattice matching of the substrate and the active material also plays an important role during the electrodeposition process. Electrocatalytic performance of the newly prepared materials in water electrolysis was evaluated using the hydrogen and oxygen evolution reactions (HER and OER). The results demonstrate the high electrocatalytic activity of Ni/FeM in the OER and HER, and the good stability of Ni/TiM in HER.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2024
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IF 4.1
Yunhao Zhang,Yanxin Qiao,Yihui Wu
The development of efficient, inexpensive, and earth-abundant electrocatalysts for the oxygen evolution reaction (OER) represents a significant challenge for the large-scale production of hydrogen. The primary obstacle to the advancement of OER is the necessity for a considerably higher overpotential than the theoretical oxygen evolution potential, due to the sluggish kinetics of the electron transfer reaction, which involves a large amount of thermodynamic energy. In this article, amorphous and cauliflower-like Co-P electrocatalysts were in situ grown on nickel foam by dynamic hydrogen bubble template (DHBT) electrodeposition method. The Co-P electrocatalyst with Co/P ratio optimal presented excellent electrocatalytic activities with a low overpotential of 239 mV for OER at 10 mA·cm −2 and long-term stability in 1.0 M KOH. The outstanding OER performance of the catalyst is mainly attributed the synergistic effect of amorphous and cauliflower-like structure, superhydrophilicity surface, and the electronic regulation by adjusting the atomic ratio of Co to P. This research will bring fresh ideas and strategies for developing novel simple, affordable, and efficient electrocatalysts to boost OER kinetics.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2019
·Vol. 9
·期 1
·1-11
·
IF 4.011
Chandrashekar Bananakere Nanjegowda,Smitha Ankanahalli Shankaregowda,Wu Yingchun,Cai Nianduo,Li Yunlong,Huang Ziyu,Wang Weijun,Shi Run,Wang Jingwei,Liu Shiyuan,Krishnaveni S.,Wang Fei,Cheng Chun
Transfer method of chemically vapor deposition graphene is an appealing issue to realize its application as flexible and transparent electrodes. A universal stamping method to transfer as grown graphene from copper onto different flexible and transparent polymers (FTPs) reported here ensures simple, robust, rapid, clean and low-cost. This method relies on coating ethylene vinyl acetate (EVA) onto the as grown graphene, binding EVA coated graphene/Cu with FTPs and delamination by hydrogen bubbling process, which is analogous to the method used by stamping process where ink carries the imprint of the object onto any materials. The fate of the stamping method depends on how strongly the adhesion of EVA coated graphene/Cu with target FTPs. Interestingly, we have found that the thin film of EVA/graphene/Cu can only bind strongly with the FTPs of less than 25 µm in thickness and lower glass transition temperature value to the EVA while wide range of other FTPs are considered upon surface engineering to enhance the binding strength between FTPs and EVA. What’s more, the electrical performance was investigated with a demonstration of triboelectric nanogenerators which confirmed the reliability of graphene transfer onto the FTPs and prospect for the development of flexible and transparent electronics.
研究领域:
材料科学
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
VACUUM
·
2025
·
IF 3.9
Kang Zheng,Hong Zeng,Wenlong Lv,Lingyun Wang
The DHBT method is widely used for the preparation of metallic porous materials. However, the porous metals prepared by this method have many disadvantages, such as: large average pore diameter, wide pore distribution and low pore density, which limit the method's application. In this study, low-pressure electroplating was introduced into the DHBT process, guided by gas solubility and liquid-phase mass transfer theories. By adjusting bubble desorption time, improving current distribution uniformity, and enhancing mass transfer at the cathode surface, the controllable preparation of porous nickel with an optimized pore structure was achieved. Results show that low-pressure porous nickel has smaller average pore sizes, higher pore densities, and better pore consistency compared to those prepared at atmospheric pressure. The average pore size at 40 kPa is only 43 % of that at atmospheric pressure, with pore density and specific surface area (SSA) increased 3.5 and 1.4 times, respectively. Additionally, the adsorption performance tests revealed that the porous nickel at 40 kPa had the highest initial adsorption rate, about 3 times that of atmospheric pressure, but the adsorption capacity did not differ much, perhaps that the adsorption capacity mainly depends on the thickness of the getter when the getter layer is thin.
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Jie Mei,Guangya Hou,Huibin Zhang,Qiang Chen,Huazhen Cao,Yiping Tang,Jianli Zhang,Guoqu Zheng
In multifunctional catalysts, Ni-based alloys and compounds can be used for methanol oxidation reaction (MOR) and urea oxidation reaction (UOR). Herein, the porous dendritic NiCu@PPy/316L stainless steel mesh (SSM) electrode is prepared by dynamic hydrogen bubble template electrodeposition, followed by cyclic voltammetry electrodeposition of polypyrrole (PPy) conductive polymer on the electrode surface. Among them, dynamic hydrogen bubbles successfully assisted the formation of porous structures in the Ni-based deposition layer. In addition, the morphology of the resulting Ni-based layer further evolves from particle stacking to dendritic with high specific surface area with Cu doping. Eventually, 2-NiCu/SSM achieves current densities of 294.5 mA·cm −2 (MOR) and 278.6 mA·cm −2 (UOR) at 0.8 V, respectively. The PPy coating prevents the agglomeration of NiCu particles in the catalytic layer and further improves the persistence of the electrochemical performance. After 2000 cycles, the current densities of 2-NiCu @PPy/SSM in the new electrolyte are maintained at 89.1% (MOR) and 94.8% (UOR) of the original value, with a 10% increase for MOR and a 7% increase for UOR compared to the sample without PPy coating (2-NiCu /SSM).
研究领域:
材料科学
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电化学
·
催化领域
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2025
·
IF 4.9
Hongye Qin,Bendong Liu,Runqiu Wu,Lezhi Ye,Jiahui Yang
Micromotors demonstrate significant potential in environmental sensing, targeted biomedical therapeutics, and microscale engineering applications due to their miniaturized architecture and ability to harness environmental energy for autonomous propulsion. Nevertheless, current magnesium (Mg)-based micromotors predominantly utilize Mg microspheres as their structural foundation, restricting geometric diversity and limiting performance improvements. This paper presents a self-propelled Mg-based micromotor fabricated via the self-rolling of titanium (Ti)/magnesium (Mg) bilayer nanomembranes. Through synergistic integration of nanomembrane patterning, bilayer stress engineering, and directional sacrificial layer release, we achieved programmable assembly of three-dimensional (3D) single-tube and V-shaped double-tube architectures. The V-shaped double-tube micromotor features a hollow, asymmetric architecture with expanded Mg-acetic acid (CH₃COOH) interfacial contact area. This configuration enables directional ejection of the generated hydrogen bubbles, thereby enhancing propulsion force and increasing speed. The double-tube micromotor achieved a propulsion speed of approximately 203 μm/s in a solution of 1.2 % CH 3 COOH, significantly outperforming the 52 μm/s speed of single-tube and surpassing the speed of Janus Mg microspheres in strong acid. The Mg-based micromotor proposed in this study features structural versatility and preferable motion performance. Combined with the known biocompatibility of Ti/Mg and the therapeutic potential of hydrogen, this work may hold potential for future applications in targeted drug delivery and hydrogen-mediated synergistic therapy.
研究领域:
微纳机器人
·
生物医学工程
·
环境传感
·
靶向药物递送
·
氢气治疗
✓ 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）