JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Bing Xue,Mei Yu,Jianjun Liu,Jianhua Liu,Songmei Li,Liangliang Xiong
Graphene oxide (GO) was introduced into sol-gel systems to enhance the corrosion protective properties of the obtained film on AA2024-T3 aluminum alloy . The characterization of morphology, microstructure and component of the films indicated that GO covalently reacted with silanol groups from hydrolyzed 3-glycidoxypropyl-trimethoxysilane (GPTMS) monomer , forming silane functionalized GO (SGO) by C O Si covalent bonds . Corrosion protective properties of the films were evaluated through electrochemical impedance spectroscopy (EIS), potentiodynamic polarization and immersion tests studies. The results showed that the addition of GO improved the corrosion protective properties of sol-gel film distinctly by providing the good barrier property of layered GO and enhancing the cross-linking density of the film. The significant improvement of GO on sol-gel film mainly focused on the resistance and capacitance of film itself. The optimal concentration of GO addition was 0.5 mg mL −1 , at which the film was uniform and showed good corrosion protective properties in 0.05 M NaCl aqueous solution. The corrosion current density of the sol-gel film with 0.5 mg mL −1 GO was one order magnitude smaller than that of sol-gel film without GO. The protection efficiency of the film was up to 99.45%.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Tianyu Zheng,Jinyan Liu,Lu Wang,Jia Wang,Guixiao Jia
To enhance the corrosion resistance of AA2024-T3 in 0.01 mol·L −1 NaOH aqueous solution, the inhibition characteristics of the amphoteric surfactant disodium- N -dodecyliminodiacetate (RNC-12) were assessed by means of the static weight loss method, electrochemical impedance spectroscopy , potentiodynamic polarisation curves, atomic force microscopy and X-ray photoelectron spectroscopy, and the results were compared with those of sodium laurate (SL). Quantum chemical calculations and molecular dynamics (MD) simulations were also performed to predict and analyse the relationships between the molecular structure and inhibition efficiency. The results of the experiments revealed that RNC-12 achieved a higher inhibition efficiency of 91% as a valid inhibitor of AA2024-T3 in alkaline medium compared with SL (81%). The results of surface analysis showed that the two inhibitors could be well adsorbed on the alloy surface, and the degree of surface corrosion was as follows: without inhibitor >SL >RNC-12. Quantum chemical calculations and MD simulations showed that the anionic state of RNC-12 possesses a smaller band gap, larger dipole moment , and more negative energy of adsorption, indicating that RNC-12 is more easily adsorbed on the alloy surface than SL. Therefore, the experimental results were in accordance with the theoretical calculations.
研究领域:
材料科学
·
电化学
·
理论化学
✓ 已验证
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2020
·
IF 4.469
Liangliang Xiong,Mei Yu,Yingquan Li,Xiangxin Kong,Songmei Li,Jianhua Liu
Salicylaldehyde@ZIF-8/graphene oxide (SZG) nanosheets were fabricated by anchoring salicylaldehyde@ZIF-8 nanoparticles on graphene oxide. SZG nanosheets were modified by amino silane 3-aminopropyltriethoxysilane (f-SZG) to improve the compatibility with epoxy coating. Sedimentation test showed the excellent dispersion stability of f-SZG in resin epoxy even after standing for 480 h. The cross-sectional microstructure of coatings implied the strong f-SZG/coating matrix interface by transforming the cleavage fracture to the ductile. Additionally, the stimuli-responsive release to H + and Al 3+ ions of f-SZG is maintained after the silanization. Compared with other samples, f-SZG0.5 epoxy coatings show the optimal long-term corrosion protection property with the lowest reduction rate of |Z| 0.01Hz (13.6%) after 480 h immersion and the intact surface after 27d salt spray test due to the stronger interfaces of f-SZG/epoxy matrix and coating/substrate, the proper content (0.5 wt.%) and the enhanced cross-linked density of coating.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2022
·
IF 3.841
Jia Wang,Jinyan Liu,Xiaojuan Wang
Inhibitory effects of sodium abietate (SA) and sodium lignin sulfonate (SLS) were discussed using a series of tests and theoretical calculations. Experimental outcomes obtained via weight loss and electrochemistry data showed that SA and SLS significantly inhibited the corrosion of AA2024-T3 Aluminum alloys in NaOH media. The inhibition efficiency ( η %) for SA and SLS was up to 96.02% and 98.82% at 5 × 10 −3 mol·L −1 , respectively. SA and SLS acted as anode-dominated mixed-type inhibitors in aggressive solutions as recorded by electrochemical methods. In addition, the surface analyses further corroborated the protection of the metal surface from corrosion as added with SA and SLS that can form an adsorbed film on the metal surface. The adsorption obeyed Langmuir isotherm which illustrated the adsorptions of the SA and SLS were a mix of physical and chemical adsorptions. Moreover, the inhibition performance of both inhibitors with the molecular structure shown in quantum chemical calculations and molecular dynamics simulation found that be suitable for explaining the inhibitive action of the two. The study suggests SA and SLS as green sources appropriate for anticorrosive applications.
研究领域:
材料科学
·
电化学
·
理论计算
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2018
·Vol. 5
·期 6
·1415-1422
·
IF 5.106
Ailijiang Abudurusuli,Kui Wu,Yilimiranmu Rouzhahong,Zhihua Yang,Shilie Pan
Four new quaternary chalcogenides with the formula of Na6Zn3MIII2Q9 (MIII = Ga, In; Q = S, Se) have been successfully synthesized for the first time. They are isostructural and crystallize in the monoclinic C2/c space group. As seen from their structures, they exhibit two opposite direction layers composed of the interconnection of countless (Zn/MIII)10Q20 supertetrahedra (T3-type) clusters, and then three coordination-type NaQn units (n = 4–6) exist among the interlayers to bridge them together. Note that these T3 clusters connect with each other by vertex-sharing to form the layers in the title compounds, which can be viewed as the first discovered examples in the known quaternary chalcogenides that only exhibit the tetrahedron-sharing T3 clusters. Moreover, we have also systematically compared the structural differences of all the T3-containing quaternary chalcogenides and the result shows that the title compounds possess the shortest interlayer spacing and more tilting T3 cluster-built layers in comparison with other related compounds. The measured optical properties indicate that their optical bandgaps are in the range from 2.22 to 3.15 eV, respectively. The photoluminescence result shows that the title compounds have potential application prospects as blue and green light emitters in view of their obvious emission peaks centered at 463 and 541 nm. Electronic structures and density of states were also calculated by first-principles calculations and the results indicate that their optical bandgaps are mainly determined by the T3 clusters.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
NUTRITION RESEARCH
·
2015
·
IF 2.472
Qian Wang,Shuang-ting Wang,Xin Yang,Pan-pan You,Wen Zhang
Myricetin (MyR), a naturally occurring flavonol widely distributed in fruits, vegetables, and medicinal plants , has anticancer, anti-inflammatory, antihyperlipidaemic , and antiobesity activities. In the present study, we hypothesized that the antiobesity property of MyR is mediated via suppression of differentiation of preadipocytes into adipocytes and promotion of lipolysis of mature adipocytes, which effectively decrease the intracellular triglyceride concentration of adipocytes. Accordingly, the aim of this work was to investigate the effects of MyR on adipocyte differentiation and lipolysis in differentiated 3 T3-L1 adipocytes. Our results showed that MyR inhibited differentiation of 3 T3-L1 preadipocytes in a concentration-dependent manner. Myricetin downregulated the mRNA and protein levels of CCAAT/enhancer-binding protein α and peroxisome proliferator-activated receptor γ , both of which are major adipogenic transcription factors. Furthermore, the mRNA levels of other adipogenesis-related transcription factors, namely, CCAAT/enhancer-binding protein β , sterin regulatory element binding protein 1-c, peroxisome proliferator-activated receptor γ coactivator–1, adipocyte protein 2 , lipoprotein lipase and glucose transporter 4 , were also reduced by MyR treatment. Moreover, MyR significantly inhibited the phosphorylation of extracellular signal–regulated kinase, Jun N-terminal kinase, and p38 during the differentiation process. On the other hand, MyR induced a dose-dependent increase in glycerol release in fully differentiated adipocytes, indicating its stimulatory effect on adipocyte lipolysis. Furthermore, MyR downregulated mRNA level of perilipin A and enhanced the phosphorylation level of extracellular signal–regulated kinase, Jun N-terminal kinase, and p38 during lipolysis. Taken together, these findings indicate that MyR exerts antiobesity activity in adipocytes.
研究领域:
药理学
·
细胞生物学
·
分子生物学
·
营养学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2019
·
IF 4.527
Shaojun Liang,Shengxian Liang,Hui Zhou,Nuoya Yin,Francesco Faiola
2′,2′,4,4′-tetrabromo diphenyl ether (BDE-47), one of the most abundant congeners of commercial pentaBDE utilized as flame retardants , has been phased out of production due to its potential neural toxicity and endocrine disrupting activities, and yet still present in the environment. Several alternatives to BDE-47, including tetrabromobisphenol A (TBBPA), tetrabromobisphenol S (TBBPS), tetrachlorobisphenol A (TCBPA) and decabromodiphenyl ether (BDE-209), are presently employed without restrictions and their potential toxic effects on human neural development are still unclear. In this study, we utilized a human neural stem cell (hNSC)-based system to evaluate the potential developmental neurotoxic effects of the above-mentioned five chemicals, at environment and human exposure relevant concentrations. We found that those compounds slightly altered the expression of hNSC identity markers ( SOX2 , SOX3 and NES ), without impairing cell viability or proliferation, in part by either modulating glycogen synthase kinase 3 beta (GSK3β) signaling (TBBPS, TCBPA and BDE-47), and slightly disturbing the NOTCH pathway (TBBPA, TBBPS and TCBPA). Moreover, the five chemicals seemed to alter hNSC differentiation by perturbing triiodothyronine (T3) cellular signaling. Thus, our findings suggest that the five compounds, especially TBBPS, TCBPA, and BDE-47, may affect hNSC self-renewal and differentiation abilities and potentially elicit neural developmental toxicity.
研究领域:
神经科学
·
毒理学
·
细胞生物学
·
分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BMC Complementary Medicine and Therapies
·
2021
·Vol. 21
·期 1
·1-11
·
IF 0
Lou Hai-xia,Fu Wen-cheng,Chen Jia-xiang,Li Tian-tian,Jiang Ying-ying,Liu Chun-hui,Zhang Wen
Background Alisol A 24-acetate (AA-24-a), one of the main active triterpenes isolated from the well-known medicinal plant Alisma orientale (Sam.) Juz., exhibits multiple biological activities including hypolipidemic activity. However, its effect on lipid metabolism in adipocytes remains unclear. The present study aimed to clarify the effect of AA-24-a on adipocyte lipolysis and to determine its potential mechanism of action using 3 T3-L1 cells. Methods We assayed the release of glycerol into culture medium of 3 T3-L1 cells under treatment with AA-24-a. Protein and mRNA expression and phosphorylation levels of the main lipases and kinases involved in lipolysis regulation were determined by quantitative polymerase chain reaction and western blotting. Specific inhibitors of protein kinase A (PKA; H89) and extracellular signal-regulated kinase (ERK; PD98059), which are key enzymes in relevant signaling pathways, were used to examine their roles in AA-24-a-stimulated lipolysis. Results AA-24-a significantly stimulated neutral lipolysis in fully differentiated adipocytes. To determine the underlying mechanism, we assessed the changes in mRNA and protein levels of key lipolysis-related genes in the presence or absence of H89 and PD98059. Both inhibitors reduced AA-24-a-induced lipolysis. Moreover, pretreatment with H89 attenuated AA-24-a-induced phosphorylation of hormone-sensitive lipase at Ser660, while pretreatment with PD98059 attenuated AA-24-a-induced downregulation of peroxisome proliferator-activated receptor-γ and perilipin A. Conclusions Our results indicate that AA-24-a promoted neutral lipolysis in 3 T3-L1 adipocytes by activating PKA-mediated phosphorylation of hormone-sensitive lipase and ERK- mediated downregulation of expression of perilipin A.
研究领域:
药理学
·
细胞生物学
·
分子生物学
✓ 已验证
产品关联
DOI
PubMed
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2016
·Vol. 163
·期 13
·C798
·
IF 3.014
Bing Xue,Mei Yu,Jianhua Liu,Songmei Li,Liangliang Xiong,Xiangxin Kong
3-glycidoxypropyl-trimethoxysilane (GPTMS) functionalized graphene oxide (GO) was used to synthesize graphene-based film for corrosion protection of AA2024-T3 aluminum alloy. GO covalently reacted with the silanol group from the hydrolyzed GPTMS monomer, forming silane functionalized GO (silane-GO) linked by C-O-Si covalent bonds. The silane coupling agents acted as a 'bridge' to link GO to adjacent GO and to the metal surface by covalent bonds. The corrosion protective properties of silane-GO film were determined by electrochemical measurements and immersion tests. Results indicated that silane-GO film provided effective protection for the metal substrate and the readily corrodible areas (at the periphery of protruding constituent particles). This was due to the good barrier property from layered GO, the filled defects and gaps between GO, and the enhanced adhesion strength of GO to adjacent GO and the film to the substrate. The protective efficiency of silane-GO film was up to 95.0%. The successful application of silane-GO film on AA2024-T3 aluminum alloy suggests that there is the considerable potential for broad application of graphene-based protective film on metals, even on the metals with corrosion-sensitive areas.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
DOI
高影响因子
Journal of Coatings Technology and Research
·
2019
·Vol. 16
·期 3
·881-893
·
IF 1.584
Wang Xiao-Xin,Cao Yun-Qing,Fu Hong-Li,Jiang Mei-Yan,Hu Ji-Ming
This work aimed at understanding the role of silane pretreatment layer in an organic coating system. The study consists of two parts. In the first part, the anticorrosion performance and interfacial property of silane-pretreated epoxy coatings were studied. The results showed that pretreatment with functional 3-glycidoxypropyl-trimethoxysilane (GPTMS) strongly improves the adhesion of epoxy-coated AA2024-T3 aluminum alloy due to the high interfacial compatibility between silane and epoxy coatings and that pretreatment with nonfunctional bis-1,2-[triethoxysilyl]ethane (BTSE) remarkably reduces the adhesion to the alloy because of low compatibility. Nevertheless, the BTSE film provides higher resistance to corrosion than the GPTMS-pretreated coating system, because the former is more hydrophobic and thicker.
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
Journal of Coatings Technology and Research
·
2026
·
IF 3.4
Ji Ying,Xie Bin,Shi Hongwei,Song Yingwei,Jiang Xindong
Fluorescent corrosion indicators can identify underlying corrosion on metallic substrates by detecting metal ions resulting from corrosion processes. Nevertheless, the direct incorporation of fluorescent probes into the coating may result in numerous adverse effects. To maximize effective application, encapsulating these probes in specific carriers is considered to be a viable technique. In this work, the design and application of a new fluorescent probe were reported, which contains o-benzylaminophenol (BC) as fluorophores and nanomesoporous silica (MSP) as carrier. MSP, characterized by an average particle size of 90 nm, was synthesized using a sol-gel process. BC was synthesized, which exhibited yellowish-green fluorescence upon the addition of aluminum nitrate, methanol, and water. A novel intelligent container with the function of early corrosion warning was developed by incorporating BC into the MSP carrier by vacuum impregnation. BC@MSP smart containers were included in the solvent-based polyurethane coatings and applied on 2024-T3 aluminum alloy. The coating is engineered to identify corrosion within 24 h following exposure to 3.5 wt.% NaCl by the formation of a complex by BC reacting with metal ions (Al 3+ ). Electrochemical impedance evidenced that the epoxy coating with 4 wt.% BC@MSP presents high corrosion resistance even after 28 d.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Gang Li,Yayun Li,Chuanxi Lin,Hao Peng,Yunsheng Xue,Wenfeng Qin,Xin Zhao,Bin Zhou
2024 aluminum alloy has high strength, processing performance, and good damage tolerance performance, but it is prone to intergranular corrosion and pitting. Therefore, the development of corrosion protective coatings is essential for the aluminum alloy. In this paper, cerium ion (Ce 3+ ) was doped into chitosan-modified montmorillonite (Ce-CS-MMT) by ion exchange method, and the corrosion protective performance of Ce-CS-MMT epoxy coating (Ce-CS-MMT/EP) was investigated. The electrochemical analysis of aluminum alloy in cerium-containing solution showed the corrosion inhibition efficiency reached 95.52%. The result indicates the corrosion inhibition effect of cerium-containing solution was better than pure NaCl solution and MMT solution. The corrosion study of the coating illustrates that the protection rate of Ce-CS-MMT/EP reached 95.82%, which was higher than that 91.83% of Ce-MMT/EP. The result indicates the resistance of charge transfer was greater and the better shielding effect for electrolyte corrosion ions than MMT and Ce-MMT epoxy coatings, and the corrosion protective performance was excellent.
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
危险品化学品经营许可证（带存储）