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Influence of TiO_2 on the alkali resistance and Structure of Invert Glass

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Journal of Wuhan University of Technology(Materials Science) 2003年第3期18卷 23-26页

作者：赵青林 Center of Silicate Engineering Wuhan University of Technology

Through measuring the alkali resistance of the invert glass and the quantity of SiO 2 and TiO 2 migrating fron the glass into the solution,the influence of TiO 2 on the alkali resistance of the glass is discussed and its structure is also analyzed by infrared *** is concluded that TiO 2 has double functions for the alkali resistance of the invert *** the one hand ,both TiO 2 polarizing the secondary ions in glass and TiO 2 isomorphism replacement of SiO 2 make the alkali resistance of the glass *** the ther hand,TiO 2 patching network and anti erosion covering help to increase the alkali resistance.

关键词： invert glass doped oxide alkali resistance

Research on alkali resistance of Alumina-rich MgAl2O4 Spinel for alkali Recovery Furnace

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China's Refractories 2018年第2期27卷 37-40页

作者： CHEN Ding GU Huazhi HUANG Ao XIE Jing The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081China

Chrame containing refractories are a kind of traditional material for the lining of alkali recovery furnaces, but the formation of hexavalent chrome compounds will give rise to detrimental effect on environment and human＇s health. With the gradual awakening of people＇s comciousness about environment protection, it is urgent to prepare environmental-friendly materials for alkali recovery jurnaces with high quality and long life. In this paper, alumina-rich MgAl2O4 spinel （ AR90 ） was used to replace chromite. The physical properties of dried （110 ℃ for 24 h） or fired （1 300 ℃ for 3 h） AR90 and chromite were studied, respectively. The alkali vapor method was used to determine the alkali resistance of the two materials. The results show that：（1） after drying at 110 ℃ for 24 h, AR90 specimens show higher apparent porosity and slightly lower bulk density than chromite specimens; after firing at 1 300 ℃ for 3 h, AR90 has significantly higher apparent porosity as well as higher bulk density; （2） after the alkali attack, the AR90 specimens sintered at 1 300 ℃ exhibit smaller strength change and much higher compressive strength than the chromite specimens; meanwhile, the permeability degree of alkali salt in chromite specimens is more serious than that in AR90 specimens, which indicates that AR90 possesses better alkali resistance.

关键词： alkali recovery furnace chrome free alumina-rich magnesium aluminate spinel alkali resistance

Steric hindrance shielding viologen against alkali attack in realizing ultrastable aqueous flow batteries

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Journal of Energy Chemistry 2024年第10期97卷 529-534,I0011页

作者： Liwen Wang Kai Wan Xianzhi Yuan Zhipeng Xiang Zhiyong Fu Zhenxing Liang Guangdong Provincial Key Laboratory of Fuel Cell Technology School of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhou 510641GuangdongChina State Key Laboratory of Pulp and Paper Engineering South China University of TechnologyGuangzhou 510641GuangdongChina Guangdong Provincial Laboratory of Chemistry and Fine Chemical Engineering Jieyang Center Jieyang 522000GuangdongChina

Viologens known as a kind of promising negolyte materials for aqueous organic redox flow batteries,face a critical stability challenge due to the S_N2 nucleophilic attack by hydroxide ions(OH-)during the battery *** this work,a N-cyclic quaternary ammonium-grafted viologen molecule,viz.1,1'-bis(4,4'-dime thylpiperidiniumyl)-4,4'-bipyridinium tetrachloride((DBPPy)Cl_(4)),is developed by the molecular engineering *** obtained(DBPPy)Cl_(4) molecule shows a decent solubility of 1.84 M and a redox potential of-0.52 V ***/AgCl,Experimental and theoretical results reveal that the grafted N-cyclic quaternary ammonium groups act as the steric hindrance to prevent nucleophilic attack by OH~-,increasing the alkali resistance of the electroactive *** symmetrical battery with 0.50 M(DBPPy)Cl4shows negligible decay during the 13-day cycling *** demonstration,the flow battery utilizing 1.0 M(DBPPy)Cl_(4) as the negolyte and 1-(1-oxyl-2,2',6,6'-tetramethylpiperidin-4-yl)-1'-(3-(trimethylammonio)propyl)-4,4'-bipyridinium trichloride as the posolyte exhibits a high capacity retention rate of 99.99%per cycle at 60 mA cm^(-2).

关键词： Aqueous organic flow batteries Viologen Stability Steric hindrance alkali resistance

Stretchable alkaline quasi-solid-state electrolytes created by super-tough, fatigue-resistant and alkali-resistant multi-bond network hydrogels

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Chinese Chemical Letters 2023年第4期34卷 275-278页

作者： Hao Xu Yujun Liu Xu-Ming Xie Key Laboratory of Advanced Materials(MOE) Department of Chemical EngineeringTsinghua UniversityBeijing 100084China

Hydrogel-based quasi-solid-state electrolytes(Q-SSEs) swollen with electrolyte solutions are important components in stretchable supercapacitors and other wearable devices. This work fabricates a supertough, fatigue-resistant, and alkali-resistant multi-bond network(MBN) hydrogel aiming to be an alkaline Q-SSE. To synthesize the hydrogel, a 2-ureido-4[1H]-pyrimidone(UPy) motif is introduced into a poly(acrylic acid) polymer chain. The obtained MBN hydrogels with 75 wt% water content exhibit tensile strength as high as 2.47 MPa, which is enabled by the large energy dissipation ability originated from the dissociation of UPy dimers due to their high bond association energy. Owing to the high dimerization constant of UPy motifs, the dissociated UPy motifs are able to partially re-associate soon after being released from external forces, resulting in excellent fatigue-resistance. More importantly, the MBN hydrogels exhibit excellent alkali-resistance ability. The UPy Gel-10 swollen with 1 mol/L KOH display a tensile strength as high as ~1.0 MPa with elongation at break of ~550%. At the same time, they show ionic conductivity of ~17 m S/cm, which do not decline even when the hydrogels are stretched to 500% *** excellent mechanical property and ionic conductivity of the present hydrogels demonstrate potential application as a stretchable alkaline Q-SSE.

关键词： alkaline quasi-solid-state electrolyte Super-tough hydrogel Fatigue resistance alkali resistance Multi-bond network

Marine urease with higher thermostability, pH and salinity tolerance from marine sponge-derived Penicillium steckii S4-4

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Marine Life Science & Technology 2021年第1期3卷 77-84页

作者： Changrong Liu Yao Xiao Yilin Xiao Zhiyong Li Marine Biotechnology Laboratory State Key Laboratory of Microbial MetabolismSchool of Life Sciences and BiotechnologyShanghai Jiao Tong UniversityShanghai 200240China

Urease has a broad range of applications,however,the current studies on urease mainly focus on terrestrial plants or ***,it is quite necessary to determine if marine-derived ureases have diferent characteristics from terrestrial origins since the fnding of ureases with superior performance is of industrial *** this study,the marine urease produced by Penicillium steckii S4-4 derived from marine sponge Siphonochalina *** *** marine urease exhibited a maximum specifc activity of 1542.2 U mg protein−*** molecular weight of the enzyme was 183 kDa and a single subunit of 47 kDa was detected,indicating that it was a *** N-terminal amino acid sequence of the urease was arranged as GPVLKKTKAAAV with greatest similarity to that from marine algae Ectocarpus *** urease exhibited a K_(m) of 7.3 mmol L^(−1) and a V_(max) of 1.8 mmol urea min^(−1) mg protein^(−1).The optimum temperature,pH and salinity are 55℃,8.5 and 10%,*** urease was stable and more than 80%of its maximum specifc activity was detected after incubating at 25–60℃for 30 min,pH 5.5–10.0 or 0–25%salinity for 6 *** with the terrestrial urease from Jack bean,this marine urease shows higher thermostability,alkaline preference and salinity tolerance,which extends the potential application felds of urease to a great extent.

关键词： Marine urease Penicillium steckii Thermostability alkali resistance Salinity tolerance

Physiological and Biochemical Changes of IrlVHA-c gene Transgenic Tobacco Seedlings and Self-crossed Progeny Under NaHCO_3 Stress

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Journal of Northeast Agricultural University(English Edition) 2013年第1期20卷 5-13页

作者： Li Shan-shan Yang Tao Bi Xiao-lu Fu Guo-hua Wang Jin-gang College of Horticulture Northeast Agricultural University

In order to study the alkali resistivity of VHA-c in Iris lacteal. （IrlVHA-c）, the transgenic tobacco seedlings harboring lrlVHA-c gene from Iris lactea （To）, the self-crossed progeny （T1）, and the non-transgenic lines of tobacco seedlings were grown in Hoagland nutrient solutions supplemented with 0, 100, 200, 300, 400 mmol.L^-1 NaHCO3. The MDA content, CAT, POD and SOD activity, electrical conductivity, chlorophyll content, soluble sugar content, proline content and polyphenol oxidase activity of the seedlings were determined. The results showed that the transgenic lines of tobacco maintained a high activity up to 200 mmol.L^-1 NaHCO3, and activity was slightly lower at 300 mmol.L^-1 NaHCOa. When the concentration of NaHCO3 was as high as 400 mmol.L^-1 the seedlings were badly hurt. In addition, the activity of To and T1 transgentic tobacoo was maintained more or less. While the non- transgenic lines of tobacco could maintain viably up to 100 mmol. L^-1 NaHCO3, and they could not survive at 400 mmol. L^-1 NaHCO3. The conclusion was drawn that the alkali resistance of the tobacoo transformed IrlVHA-c was noticeably improved.

关键词： NaHCO3 stress IrlVttA-c gene transgenic tobacco alkali resistance physiological index