NANOTECHNOLOGY
·
2022
·Vol. 33
·期 19
·195601
·
IF 3.953
Zhongming Jiang,Jiamin Zhang,Kaizhao Wang,Tianyou Chen,Jiuwei Zhao,Kaijun Wang,Jin Hu
A mild strategy for fabricating nanoporous silver (np-Ag) pieces was reported via preparation of Ag–Ga alloys in relatively low temperature and subsequent electrochemical dealloying in nitric acid (HNO3) aqueous solution. After selectively etching Ga out of the Ag–Ga alloy, a typical three-dimensional (3D) bicontinuous nanoporous structure with a pore size of ∼67.21–159.33 nm was observed. A series of studies have shown that the addition of sodium dodecyl sulfate (SDS) results in minimum pore size. The coarsen exponent (n) is 1.61, and the activation energy was calculated to be 27.04 kJ mol−1. The ζ'-AgGa alloy prepared at low temperature can be used as the precursor for the preparation of fine np-Ags, and this method provides a new strategy for the industrial production of dealloyed np-Ag.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Wentong Liu,Zunli Mo,Chao Shuai,Simin He,Ruimei Yue,Xudong Guo,Ying Chen,Hui Zheng,Jianchen Zhu,Ruibin Guo,Nijuan Liu
The TiO 2 /CeO 2 /PPS composite coating is prepared by air spraying method. The introduction of TiO 2 and CeO 2 into the PPS substrate significantly improves the corrosion resistance of the composite coating , and the electrochemical corrosion current density reduces two orders of magnitude. The coating is surface-modified with cetyltrimethoxysilane and has good hydrophobicity , so it has excellent anti-fouling and self-cleaning ability. It has the advantages of low processing cost and simple preparation method compared with other anti-corrosion coatings, since the coating is only prepared by a physical mixing method and does not involve complex chemical reactions, which possess the potential for practical application.
研究领域:
材料科学
·
防腐蚀工程
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Limin Zhang,Yunyan Wang,Yong Ke,Zhumei Sun,Yun Li,Cong Peng,Mingfei Zhu,Yongjian Luo,Xiaobo Min
Zinc ferrite is a dominant phase in mass solid wastes generated from zinc or iron production, which causes the obstacle of metal recovery and recycling. A facile and efficient sulfuric acid leaching process of zinc ferrite assisted by copper powder was proposed in this study. The effects of factors on the leaching of zinc ferrite and copper were investigated. The results showed that zinc ferrite and copper were coupled and leached. The complete dissolution of zinc ferrite was obtained with wide ranges of leaching conditions. The shortest time for the complete dissolution of zinc ferrite was 10 min at 80 ℃ under the conditions: copper to zinc ferrite molar ratio of 1.5, sulfuric acid concentration of 100 g/L, liquid to solid ratio of 30 mL/g, and copper powder of + 38.5–20 μm. The least consumption of copper to realize the complete dissolution of zinc ferrite was 27.15%. The leaching kinetics was studied by the shrinking core model. It was found that zinc ferrite leaching assisted by copper was controlled by surface chemical reaction. The apparent activation energies for zinc, iron, and copper are 56 kJ/mol, 56 kJ/mol, and 50 kJ/mol, respectively. Characterization of the leaching residues and determination of iron and copper species in the leaching solution showed galvanic corrosion took place between zinc ferrite and copper, enhancing their acid dissolution.
研究领域:
冶金学
·
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CORROSION SCIENCE
·
2020
·
IF 6.479
Ning Peng,Libo Liang,Yuqing Wen
This study investigated the adsorption of hydrogen bubbles and tunnel formation on aluminium foil during direct current (DC) electrochemical etching in an electrolyte with and without silicone oil additive. The results indicated that the etched tunnels obtained in the electrolyte containing silicone oil were more uniformly distributed with a more consistent size and length. This was attributed to the additive ability to facilitate the desorption of large bubbles on the aluminium surface, resulting in uniform corroded regions. Moreover, the generated narrow tunnels can accelerate the hydrogen evolution inside the tunnels, resulting in increasing the length of the etched tunnels.
研究领域:
材料科学
·
电化学
·
金属腐蚀与防护
·
表面工程
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2021
·
IF 3.871
Bin Han,Shigen Zhu,Weiwei Dong,Yunfeng Bai,Hao Ding,Yilan Luo,Ping Di
In this study, 85-xWC-xTiC-15wt%Al 2 O 3 (x = 0, 5, 10 and 20 wt%) composites were fabricated via hot pressing sintering technology. The influences of TiC additives on the mechanical performance and electrochemical behavior of WC-Al 2 O 3 composite in NaCl solution were investigated. The mean size of WC grain showed a downward trend with the increase of TiC content. The relative density, hardness and fracture toughness of WC-based composites were improved by TiC additives. The maximum values of mechanical performance were obtained when TiC content was 10 wt%. Moreover, the research results indicated that TiC additives significantly increase the corrosion potential and decrease the corrosion current density in NaCl solution. When TiC content increased, the charge-change resistance (R ct ) value presented an uptrend, and then decreased obviously when the TiC content reached 20 wt%. The XPS spectrum and SEM images proved that TiO 2 passivation film was formed on the surface of WA15-10TiC composite. Therefore, it could be concluded that TiO 2 passive film could inhibit further corrosion of the composite.
研究领域:
材料科学
·
腐蚀科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Bin Han,Shigen Zhu,Weiwei Dong,Yunfeng Bai,Hao Ding,Yilan Luo,Ping Di
(85-x)WC–15 wt%Al 2 O 3 –xTiC (x = 0, 1.5, 2.5, 5, 10, and 20 wt%) composites were prepared by vacuum hot-press sintering. The influence of TiC addition on the corrosion behaviour of WC–Al 2 O 3 composites in 0.1 M NaOH solution was revealed. The results suggest that all the samples containing added TiC had the TiC phase and (W, Ti) C solid-solution phase, while the base composite had neither phase. With increasing added TiC content, the average grain size of WC decreased, and the relative density first increased and then decreased. Furthermore, the results suggest that the addition of TiC could noticeably increase the free corrosion potential and impedance and reduce the corrosion current density. However, the composite containing 20 wt% added TiC showed the opposite trend. Therefore, it can be concluded that the corrosion performance of the composites in an alkaline medium can be improved by adding an appropriate amount of TiC. The change in corrosion properties was caused by changes in the solid-solution phase, relative density, and TiO 2 oxide film .
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2019
·Vol. 29
·期 45
·1904429
·
IF 15.621
Yonggang Feng,Bolong Huang,Chengyong Yang,Qi Shao,Xiaoqing Huang
Unlike the well-established shape/composition control, surface distortion is a newly emerged yet largely unexplored nanosurface engineering for boosting electrocatalysis. Tapping into the novel electrocatalysts for taking full use of the distortion effect is therefore of importance but remains a formidable challenge. Here, an approach to designing highly distorted porous Pt nanosheets (NSs) by electrochemical erosion of ultrathin PtTe 2 NSs is reported. The inherent ultrathin feature and massive leaching of Te have conspired to produce a highly distorted structure. As a result, the generated Pt NSs exhibit a much-enhanced oxygen reduction reaction (ORR) mass and specific activity of 2.07 A mg Pt −1 and 3.1 mA cm −2 at 0.90 V versus reversible hydrogen electrode, 9.8 and 10.7 times higher than those of commercial Pt/C. The highly distorted Pt NSs can endure 30 000 cycles with negligible activity decay and structure variation. Density functional theory calculations reveal that the electrochemical corrosion induced nanopores, boundaries, and vacancies consist of Pt sites with substantially low coordination numbers deviating from the one of pristine Pt (111) surface. These Pt sites actively act as electron-depleting centers for highly efficient electron transfer toward the adsorbing O-species. This study opens a new design for fully using the distortion effect to promote ORR performance and beyond.
研究领域:
材料科学
·
电化学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2015
·
IF 3.088
Yong Liu,Kaiyang Li,Tao Luo,Min Song,Hong Wu,Jian Xiao,Yanni Tan,Ming Cheng,Bing Chen,Xinrui Niu,Rong Hu,Xiaohui Li,Huiping Tang
In this work, powder metallurgical (PM) Ti–Mg alloys were prepared using combined techniques of mechanical alloying and spark plasma sintering. The alloys mainly consist of super saturations of Mg in Ti matrix, and some laminar structured Ti- and Mg-rich phases. The PM Ti–Mg alloys contain a homogeneous mixtures of nanocrystalline Mg and Ti phases. The novel microstructures result in unconventional mechanical and biological properties. It has been shown that the PM Ti–Mg alloys have a much lower compression modulus (36–50 GPa) compared to other Ti alloys, but still remain a very high compressive strength (1500–1800 MPa). In addition, the PM Ti–Mg alloys show good biocompatibility and bioactivity. Mg can dissolve in the simulated body fluids, and induce the formation of the calcium phosphate layer. The compression modulus of PM Ti–Mg alloys decreases with the amount of Mg, while the bioactivity increases. Although the corrosion resistance of Ti–Mg alloys decreases with the content of Mg, the alloys still show good stability in simulated body fluid under electrochemical conditions. The indirect and direct cytotoxicity results show that PM Ti–Mg alloys have a good biocompatibility to NIH-3T3 cells. Therefore, the PM Ti–Mg alloys are promising candidates in biomedical applications.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Mengyao Li,Jingyu Wang,Hongxia Cao,Xing Zhao,Yuchun Zhang,Yong Yan
Controlling and directing colloidal micro/nanoparticle assembly using external forces is essential to developing modern electro-optical devices. Here we show that the concentration gradients of metal ions produced by chemical/electrochemical corrosion could drive the motion of colloidal microspheres under the assistance of a well-known osmotic force. This force is programmable in both direction and strength which enables us to guide the moving directions of microspheres at controlled rates. To demonstrate the utility of this force in producing ordered assemblies, dynamic colloidal “crystals” built with one and/or two types of microspheres that replicate the electrode templating patterns are created. In addition, the motion of particles and their dynamic assembly are reproduced by a simulation combining Poisson–Nernst–Planck and Navier–Stokes equations. We believe this method opens the door to the development of complex patterns (e.g., differing in pattern shapes, homo- and/or heterojunctions with two or multiple components) self-assembled by colloidal particles and functional materials with electro-optical properties.
研究领域:
材料科学
·
物理化学
·
纳米技术
✓ 已验证
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2019
·
IF 3.192
Haowei Huang,Huihui Wang,Yuhui Xie,Dexuan Dong,Xiang Jiang,Xinya Zhang
To enhance corrosion resistance of zinc phosphate coatings on mild steel, boron nitride nanosheets (BNs) were introduced into zinc phosphating bath. The effects of BNs on the phase composition, surface morphology and corrosion resistance of phosphate coatings were investigated by varying the concentration of BNs (0.15–0.60 g/L) in the phosphating bath. Results show that the presence of BNs could effectively reduce the crystal sizes of phosphate crystals and thus make BN-incorporated phosphate coatings denser and finer than pure phosphate coatings. Moreover, BN-introduced phosphating bath yields heavier phosphate coatings (25.10 g·m −2 ). In the electrochemical corrosion measurements, BN-incorporated phosphate coatings display the corrosion current of 3.21 × 10 −6 A/cm 2 , which is one order of magnitude lower than the ones without BNs. Moreover, the time against corrosion of copper sulfate dropping prolongs to 328 s for BN-incorporated samples, which is an increase of 182.75% compared with pure ones.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2022
·
IF 4.644
Nengyuan Zeng,Yuling Liu,Yuanshen Cheng,Chong Luo,Hongdong Zhao
The efficient copper removal of the in the multi-layer copper interconnect copper film chemical mechanical planarization (CMP) process is one of the important indicators for high production efficiency of integrated circuit process. The chemical corrosiveness of polishing slurries to copper is the key factor affecting the copper removal rate. Since the copper polishing slurries are relied too much on the synergistic effect of complexing agent and oxidant for the copper chemical dissolution to achieve efficient removal of copper film, the planarization and corrosion of copper CMP cannot be well improved. In this paper, it was found that adding potassium sulfate (K 2 SO 4 ) in polishing slurries can improve the copper removal effect of CMP. In this paper, the mechanism of the effect enhancement of K 2 SO 4 was explored with series of characterization experiments. Firstly, the influence of K 2 SO 4 on the increase of electrochemical corrosion degree of copper electrode was studied by electrochemical method. Secondly, based on X-ray photoelectron spectroscopy (XPS) and laser scanning confocal microscope (LSCM), it was determined that the copper surface oxide formation increased after electrochemical corrosion caused by K 2 SO 4 . Finally, the efficiency of copper polishing removal of K 2 SO 4 in polishing slurries was verified by CMP experiments, and the dynamic oxidation enhancement mechanism of K 2 SO 4 in polishing slurries for CMP copper removal was analyzed.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Xue Xu,Huile Jin,Qian Ren,Aili Liu,Jun Li,Dewu Yin,Xin Feng,Xiaomei Dong,Jichang Wang,Shun Wang
The focus of this study is to explore ways of accelerating the corrosion rate of copper anodes for the possible synthesis of copper nano-composites on the counter electrode, and the subsequent applications of such composites as nonenzymatic glucose sensor. Normally, a strong corrosion resistance of copper anodes emerges in alkaline solutions due to the formation of a passive copper hydroxide film, which prevents further corrosion. In this research the presence of sulfide ions in the electrolyte was found to dramatically promote the corrosion process and eventually led to the production of CuxO/Cu2S (where CuxO was consist of Cu2O and CuO) nanocomposites on the counter electrode during the electrochemical corrosion process. When the as-prepared copper nanocomposites electrodes were used to detect the oxidation of glucose, a strongly enhanced anodic process was obtained, in which the detection limit was found to be around 10 uM with a linear range of 10-1000 uM and a detection sensitivity of 2688 uA cm -2 mM -1 .
研究领域:
材料科学
·
分析化学
·
生物医学工程
✓ 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）