MOLECULES
·
2023
·Vol. 28
·期 23
·7894
·
IF 4.6
Jia-Bin Xiong,Yong-Juan Zhou,Shi-Hui Wang,Zhang-Qi Xiong,Zi-Kun Zhang,Shan-Shan Zhang,Chen-Kunlun Zhang,Chao-Fan Xu,Guo-Qun Liu
MOF (metal organic framework) materials have been used as functional materials in a number of fields due to their diverse spatial tunability, which produces rich porous structures with stable and continuous pores and a high specific surface area. A triboelectric nanogenerator can convert trace mechanical energy into electrical energy, and the application of MOF materials to triboelectric nanogenerators has been intensively studied. In this work, we report on two MOFs with similar spatial structures, and the modulation of the end microstructures was achieved using the difference in F content. The output performance of friction power generation increases with the increase in F content, and the obtained polyacidic ligand materials can be used to construct self-powered corrosion protection systems, which can effectively protect metallic materials from corrosion.Keywords:TENG;MOF;corrosion protection;cathodic protection
研究领域:
材料科学
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能量转换
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腐蚀工程
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DOI
PubMed
高影响因子
NORDIC PULP & PAPER RESEARCH JOURNAL
·
2022
·Vol. 38
·期 1
·87-98
·
IF 1.595
Huijuan Shi,Zhenzhen Chen,Yingping Qi,Hua Li
A novel paper multifunctional protective solution was prepared by mixing berberine modified trimethoprimed carboxymethyl cellulose (TMP-DCMC-BBR), KH-791 modified nano-SiO 2 (KH791-SiO 2 ) and hydroxypropyl starch phosphate (HPDSP), and the mechanical properties, optical properties, antibacterial properties, aging resistance, acid and alkali resistance of the paper coated with the protective solution were investigated. It is shown that the paper coated with the multifunctional protective liquid showed good mechanical properties, and has little influence on optical properties of the paper. At the same time, it had good antibacterial properties, aging resistance and acid and alkali corrosion resistance, and there is no obvious change in paper appearance, no decolorization and ink diffusion, which is in line with the principle of “repairing the old as the old and keeping the original appearance”. Moreover, the compound solution has certain reversibility and can absorb a certain degree of ultraviolet rays, so as to weaken the damage of ultraviolet rays to the paper. It is an ideal multifunctional protective liquid for paper and has broad application prospects in paper protection.
研究领域:
材料科学
·
文物保护
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Juan Qiu,Xiang Gao,Guiqiu Li,Kanglu Feng,Kangwei Gongsun,Chunchao Chen,Changming Bu,Houyi Ma
An approach to fabricate protective film on copper substrate utilizing molybdate or tungstate assisted by dithiol was proposed. The fabricated films exhibited double-layer structure. The top layer was an organic layer primarily composed of interconnected dithiol molecules through disulfide bonds originating from the oxidation of molybdate or tungstate. The Cu 2 S bottom-layer formed as a result of the cleavage of C-S bonds subsequent to the adsorption of dithiol molecules onto the copper matrix. The molybdate participated the film via MoO x and MoS x . Although no tungstate species were detected in the film, the oxidizing effect of tungstate facilitated a conversion of dithiol molecules into polymers, resulting in a significantly thicker surface layer. The corrosion protection efficiencies of the films reached 99.7 % and 99.8 %, respectively, attributed to the incorporation of molybdate or tungstate additives. Theoretical calculations provided valuable insights into the process of film formation and elucidated the relationship between film structure and anti-corrosion performance.
研究领域:
材料科学
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电化学
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表面工程
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产品关联
DOI
高影响因子
Marine Drugs
·
2017
·Vol. 15
·期 7
·223
·
IF 3.503
Na Li,Huanhuan Wang,Xiaosai Qu,Yu Chen
ROMP is an effective method for preparing functional polymers due to its having characteristics of “living” polymerization and rapid development of catalysts. In the present work, poly(norbornene-methylamine), a mimic of chitosan, was synthesized via ROMP reaction. The amino-protected product, 5-norbornene-2-(N-methyl)-phthalimide, was prepared by a reaction of 5-norbornene-2-methylamine with phthalic anhydride, which was then subjected to the ROMP reaction in the presence of Hoveyda-Grubbs 2nd catalyst to afford poly(norbornene-(N-methyl)-phthalimide). The target product, poly(norbornene-methylamine), was obtained by deprotection reaction of poly(norbornene-(N-methyl)-phthalimide). The products in each step were characterized by FTIR and1H-NMR, and their thermal stabilities were determined by TG analysis. The effects of molar ratio between monomer ([M]/[I]) and catalyst on the average relative molecular weight (Mn¯) and molecular weight distribution of the produced polymer products were determined by gel permeation chromatography (GPC). It was found that theMn¯of poly(norbornene-(N-methyl)-phthalimide) was controllable and exhibited a narrow polydispersity index (PDI) (~1.10). The synthesis condition of 5-norbornene-2-(N-methyl)-phthalimide was optimized by determining the yields at different reaction temperatures and reaction times. The highest yield was obtained at a reaction temperature of 130 °C and a reaction time of 20 min. Our work provides a new strategy to synthesize polymers with controllable structures and free –NH2groups via ROMP.Keywords:ROMP;poly(norbornene-methylamine);controllable;living polymerization;chitosan
研究领域:
高分子化学
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生物材料科学
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产品关联
DOI
PubMed
高影响因子
Materials
·
2021
·Vol. 14
·期 10
·2629
·
IF 3.623
Shimin Chen,Bo Li,Rengui Xiao,Huanhu Luo,Siwu Yu,Jinghang He,Xia Liao
In this work, a ternary TiO2/Graphene oxide/Polyaniline (TiO2/GO/PANI) nanocomposite was synthesized by in situ oxidation and use as a filler on epoxy resin (TiO2/GO/PANI/EP), a bifunctional in situ protective coating has been developed and reinforced the Q235 carbon steel protection against corrosion. The structure and optical properties of the obtained composites are characterized by XRD, FTIR, and UV–vis. Compared to bare TiO2and bare Q235, the TiO2/GO/PANI/EP coating exhibited prominent photoelectrochemical properties, such as the photocurrent density increased 0.06 A/cm2and the corrosion potential shifted from −651 mV to −851 mV, respectively. The results show that the TiO2/GO/PANI nanocomposite has an extended light absorption range and the effective separation of electron-hole pairs improves the photoelectrochemical performance, and also provides cathodic protection to Q235 steel under dark conditions. The TiO2/GO/PANI/EP coating can isolate the Q235 steel from the external corrosive environment, and may generally be regarded a useful protective barrier coating to metallic materials. When the TiO2/GO/PANI composite is dispersed in the EP, the compactness of the coating is improved and the protective barrier effect is enhanced.Keywords:TiO2/GO/PANI nanocomposite;epoxy resin;barrier protection;photocathode protection
研究领域:
材料科学
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腐蚀工程
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纳米技术
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产品关联
DOI
PubMed
高影响因子
Food & Function
·
2020
·Vol. 12
·期 1
·191-202
·
IF 4.171
Xiaoting Yu,Ruiying Wang,Bin Lai,Mingqian Tan
In this paper, the protective effect of Auricularia auricula (A. auricula) fermentation broth on the liver and stomach of mice with acute alcoholism was studied. The A. auricula fermentation broth was prepared by adding Bacillus subtilis, lactic acid bacteria, and Saccharomyces cerevisiae to A. auricula solution. The changes of physical and chemical indexes during the fermentation of A. auricula were monitored, and the results showed the content of polysaccharides and protein in the two kinds of fermentation broth after the fermentation was completed. Furthermore, the characteristic structures of active substances such as proteins, polysaccharides and phenolics were found in the A. auricula fermentation by structural analysis. Antioxidant activity test results showed that the A. auricula fermentation broth had a strong ability to scavenge 1,1-diphenyl-2-picrylhydrazyl (DPPH) and hydroxyl radicals. Cell experiments showed that the fermentation broth of A. auricula could significantly enhance the activity of NRK cells and protect NRK cells from H2O2 damage. Animal experiments showed that the A. auricula fermentation broth had protective effects on the liver and stomach of mice with acute alcoholism, and significantly reduced the levels of alanine aminotransferase (ALT), aspartate aminotransferase (AST), total cholesterol (TC) and triglycerides (TG) in serum. These results indicated that the A. auricula fermentation broth had protective effects on the liver and stomach of mice with acute alcoholism, and could be used as a potential functional food to prevent liver and stomach damage caused by acute alcoholism.
研究领域:
食品科学
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生物化学
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医学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Ye He,Mengyang Wang,Haotian Zhang,Youxi Zhang,Yikun Gao,Siling Wang
Numerous types of mesoporous silica nanoparticles (MSNs) have been studied as carriers for small molecular drugs. However, few reports have been conducted on small MSNs having large pores, and that are suitable for loading and orally delivering therapeutic proteins. In particular, their protective properties against aggregation and enzymatic hydrolysis of loaded proteins have been rarely studied. In this study, mesocellular silica foams (MCFs) with large and different pore sizes were prepared. The loading and release behaviors of three model proteins with different molecular weights were studied. The protective properties of the MCFs against enzymatic hydrolysis of the loaded proteins were tested by sodium dodecyl sulfate polyacrylamide gel electrophoresis and high-performance liquid chromatography. The protecting effects of the MCFs against conformational change and aggregation of the loaded proteins were evaluated by circular dichroism and synchronous fluorescence spectra . Diabetic mice were inducted to evaluate in a preliminary manner the in vivo hypoglycemic effect of insulin loaded MCFs. The prepared MCFs showed rapid and high drug loading (up to 43%) of proteins. The release of proteins was tunable depending on the pore size. The lysozyme loaded MCFs could release 87% intact protein after incubation with pancreatin for 0.5 h. The digestion times for the insulin loaded in MCFs were prolonged to twice that of naked insulin. The secondary conformational changes for the insulin loaded in MCFs were only 1/40 to 1/20 of that of naked insulin incubated with Zn 2+ . Orally administered insulin-loaded MCF could reduce the blood glucose level to 69%. The prepared MCFs could effectively protect the loaded proteins from aggregation and enzymatic hydrolysis, thus exhibiting potential for application as carriers for protein delivery.
研究领域:
药剂学
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生物材料
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蛋白质工程
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产品关联
DOI
PubMed
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2021
·
IF 5.161
Shan Wan,Huikai Chen,Xiaoze Ma,Lijuan Chen,Kang Lei,Bokai Liao,Zehua Dong,Xinpeng Guo
The 5-aminotetrazole@ZIF-7@zinc gluconate/boron nitride nanosheets (NZ/BNNS) nanocomposites were synthesized by a facile one-pot method for anticorrosive reinforcement of waterborne epoxy (WEP) coating. The electrochemical tests and scratch tests show that the incorporation of NZ/BNNS nanocomposite can significantly improve the corrosion protection performance of WEP coating by the synergetic effects of passive and active protection. The impedance modulus at 0.01 Hz of WEP NZ/BNNS coating is about 1–1.5 orders of magnitude higher than that of pure WEP coating during the 288 h immersion corrosion test. The enhanced passive protection mainly derives from the two-dimensional structure and impermeability of NZ/BNNS. NZ/BNNS nanocomposites can prolong the diffusion path of corrosive medium. UV–vis spectra indicate that 5-aminotetrazole inhibitor encapsulated in NZ is stimuli-responsively released under acidic conditions. After the intrusion of corrosive ions on Q235 carbon steel, the hydrolysis of iron ions induces local acidification. NZ nanocontainers dissociate under acidic condition and release the corrosion inhibitors . The adsorption of corrosion inhibitors on the substrate then provides the active protection. Relevant corrosion protection mechanism has been proposed.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
DOI
高影响因子
Science China-Technological Sciences
·
2023
·Vol. 66
·期 9
·2681-2695
·
IF 4.6
Du JingJing,Nie ZhaoJun,Yu Hui,Xu JianXiong,Xu LiJian,Chen Qiang
Up to now, it is always a delicate and challenging task to clean and protect Xuan paper ink painting. Xuan paper is composed of cellulose with a rough surface and easy to absorb dust, which leads to poor cleaning effect and irreversible damage in traditional cleaning process. Hydrogel is one of the most effective tools to clean the artworks. However, in the practice of cleaning Xuan paper, most hydrogels cannot achieve fine cleaning result due to the interfacial adhesion issues. Herein, to protectively and effectively clean Xuan paper, using physical yet strong poly(vinyl alcohol)/poly( N -(2-hydroxyethyl) acrylamide) (PVA/PHEAA) hydrogel with suitable stiffness as the model, the interfacial adhesion between hydrogel and Xuan paper was systematically investigated, and various technologies were used to evaluate the cleaning effect. A critical interfacial adhesive energy (< 4 J/m 2 ) is found to achieve the protective and effective cleaning purpose. To the best of our knowledge, this is the first report to estimate the adhesion of hydrogel on the cleaning of paper artwork, which will provide a new viewport in the conservation practice.
研究领域:
材料科学
·
保护科学
·
高分子科学
·
文化遗产保护
✓ 已验证
DOI
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2024
·
IF 5.7
Li Hao,Yulian Ding,Yan Fan,Qiaoji Tian,Yang Liu,Yueting Guo,Jian Zhang,Hu Hou
The development of food-derived antihyperuricemic substances is important for alleviating hyperuricemia (HUA) and associated inflammation. Here, novel peptides fromThunnus albacares (TAP) with strong antihyperuricemic activity were prepared. TAP was prepared by alkaline protease (molecular weight <1000 Da), with an IC50 value of xanthine oxidase inhibitory activity of 2.498 mg/mL, and 5 mg/mL TAP could reduce uric acid (UA) by 33.62% in human kidney-2 (HK-2) cells (P < 0.01). Mice were fed a high-purine diet and injected with potassium oxonate to induce HUA. Oral administration of TAP (600 mg/kg/d) reduced serum UA significantly by 42.22% and increased urine UA by 79.02% (P < 0.01) via regulating urate transporters GLUT9, organic anion transporter 1, and ATP-binding cassette subfamily G2. Meantime, TAP exhibited hepatoprotective and nephroprotective effects, according to histological analysis. Besides, HUA mice treated with TAP showed anti-inflammatory activity by decreasing the levels of toll-like receptor 4, nuclear factors-κB p65, NLRP3, ASC, and Caspase-1 in the kidneys (P < 0.01). According to serum non-targeted metabolomics, 91 differential metabolites between the MC and TAP groups were identified, and purine metabolism was considered to be the main pathway for TAP alleviating HUA. In a word, TAP exhibited strong antihyperuricemic activity both in vitro and in vivo.
研究领域:
营养学
·
分子生物学
·
食品科学
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2020
·
IF 5.162
Kai Chen,Lei Lei,Hongming Lou,Juntao Niu,Dongjie Yang,Xueqing Qiu,Yong Qian
Oil-in-water (O/W) high internal phase emulsions (HIPEs) are widely used in foods, pharmaceuticals and cosmetics due to the high drug loading ratio, specific rheological behaviors and long shelf life. However, protective performance of active components within HIPEs maintains a low level. Herein, a series of carboxymethylated enzymatic hydrolysis lignin (EHL-CM-x) were synthesized by nucleophilic substitution and applied as macromolecular surfactant to stabilize the O/W HIPEs. It was found that EHL-CM-x combined with a small dosage of alkyl polyglycoside (APG) are able to stabilize HIPEs with 87 vol% soybean oil under neutral condition, which could be recognized as the highest internal phase reported in foods and pharmaceuticals. As a bioactive compound carrier, such EHL-CM-x stabilized HIPEs enable to provide outstanding UV, thermal and oxidation protection for sensitive natural extracts. The residual drug level obtained in this work is more than two times other gliadin/chitosan hybrid particles and sulfomethylated lignin stabilized HIPEs after UV irradiation. In vitro experiments showed that the minimum inhibitory concentration of curcumin within HIPEs against S. aureus and E. coli was 3.13 mg/mL and 12.5 mg/mL, respectively. Such lignin stabilized HIPEs could be potentially used in various areas, especially those with high stability and biosafety requirements.
研究领域:
食品科学
·
药学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
Advanced Energy Materials
·
2023
·Vol. 13
·期 22
·2300143
·
IF 27.8
Zezhao Liu,Qian Yu,Nischal Oli,Jose Fernando Florez Gomez,Shen Qiu,Haoran Tian,Qian Qiu,Wei Sun,Kuihao Li,Zhishan Liu,Mingming Chen,Jinliang Yuan,Xianyong Wu,Lan Xia
The safety issue represents a long-standing obstacle that retards large-scale applications of high-energy lithium batteries. Among different causes, thermal runaway is the most prominent one. To date, various approaches have been proposed to inhibit thermal runaway; however, they suffer from some intrinsic drawbacks, either being irreversible (one-time protection), using volatile and flammable electrolytes, or delayed thermal protection (140–150 °C). Herein, this work exploits a non-volatile, non-flammable, and thermo-reversible polymer/ionic liquid gel electrolyte as a built-in safety switch, which provides highly precise and reversible thermal protection for lithium batteries. At high temperature, the gel electrolyte experiences phase separation and deposits polymer on the electrode surfaces/separators, which blocks Li + insertion reactions and thus prevents thermal runaway. When the temperature decreases, the gel electrolyte restores its original properties and battery performance resumes. Notably, the optimal protection effect is achieved at 110 °C, which is the critical temperature right before thermal runaway. More importantly, such a thermal-protection process can repeat multiple times without compromising the battery performance, indicating extraordinary thermal reversibility. To the authors' knowledge, such a precise and reversible protection effect has never been reported in any electrolyte systems, and this work opens an exciting avenue for safe operation of high-energy Li batteries.
研究领域:
材料科学
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能源技术
·
电池安全
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）