TRIBOLOGY LETTERS
·
2023
·Vol. 71
·期 4
·1-11
·
IF 3.2
Tang Qiong,Zhao Zhiping,Li Ting,Ge Leizhen,Xu Hong,Liu Lei,Dong Jinxiang
A novel dual-functional group base oil was synthesized by alkylation of methyl oleate from biomass and tetralin from coal chemical industry. Interestingly, the monoalkylated product (MOAT) exhibited low pour point, high flash point, and viscosity index compared with the traditional alkyl aromatic lubricating oil (AN5), owing to the combination of the naphthenic aromatic (tetralin) and the methyl oleate framework. MOAT as co-base oil with PAO8 was studied to prepare lithium-based greases for the first time, and their rheological and tribological properties were evaluated in detail. The microstructure of the MOAT-based grease displayed high entanglement of lithium fiber. The 20% MOAT-based grease markedly reduced friction and wear compared with PAO8-based grease and 20% AN5-based grease. The excellent tribological performances were attributed to the strong interaction between the ester group and the soap fiber that provides more relative elasticity of grease and improves tribological behavior. Our finding clearly demonstrated that MOAT had the potential as a new class of base oil for obtaining high-performance lithium grease. Graphical Abstract
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KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2020
·Vol. 37
·期 4
·614-622
·
IF 2.69
Haleem Abdul,Syaal Sidra Bibi,Ajmal Muhammad,Ambreen Jaweria,Rauf Sajid,Ali Nasir,Muhammad Saz,Shah Afzal,Zia Muhammad Abid,Siddiq Muhammad
Here in, we demonstrate facile fabrication of silver and palladium nanoparticles in dual responsive poly(N-isopropylacrylamide- co -2-Acrylamido-2-methylpropane sulfonic acid) microgel with temperature- and pH-dependent catalytic potential. Palladium-based catalyst showed better catalytic efficiency as compared to silver-based catalyst for degradation of Rhodamine-B and P-Nitrophenol in aqueous medium under the same set of reaction conditions. The responsive nature of the microgel was found to be useful to tune the catalytic activity of the as-prepared catalysts, and reduction rate was enhanced with the pH and temperature elevation of the reaction medium; however, the increasing trend was slowed in the volume phase transition region of the microgel. Under a specific set of reaction conditions, the reduction of Rhodamine-B was as fast as 0.968 and 0.571 min −1 when catalyzed with palladium and silver based catalysts, respectively. The hydrodynamic radius of the particles of microgel support was found to be in the range of 65-180 nm when pH and temperature of the medium were varied in the range of 2-12 and 25-45, respectively. The estimated diameter of silver and palladium nanoparticles fabricated in the microgel support under the same set of reaction conditions was 9-15 and 7-11 nm, respectively.
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CATALYSIS LETTERS
·
2021
·Vol. 151
·期 10
·2833-2841
·
IF 3.186
Zhang Rui-Ying,Zhang Yue,Tong Jian,Liu Lin,Han Zheng-Bo
Abstract A cationic covalent organic polymer with bifunctional active site was synthesized, which was treated by N, N'-bis(5-bromomethylsalicylaldehyde)ethylenediamine (salen ligand) and tris(1H-imidazol-1-yl) triazine (TIT) in the presence of aluminum ethoxide. The bifunctional cationic covalent organic polymer was investigated by various characterization technologies including PXRD, FT-IR, XPS, TG, SEM, EDS, N 2 -adsorption and CO 2 -adsorption. In this polymer, aluminum acts as lewis acid site and bromine ion acts as nucleophile, cooperatively catalyzing the cycloaddition reaction of CO 2 and epoxides. Due to its cooperative effect, a higher catalytic activity was found to exhibit 98.1% conversion of epichlorohydrin under optimized conditions (Initial pressure 1.0 MPa, 0.57 mol% catalyst of COP-Al, 90 °C, reaction time 18 h, in the absence of a co-catalyst). Notably, the heterogeneous catalyst still showed good activity and stability after five cycles. Graphic Abstract
A salen-based cationic covalent organic polymers (COP-Al) was used as a bifunctional catalyst for the cycloaddition reaction of CO 2 and epoxides with high activity under solvent-free and co-catalyst-free conditions.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 23
·21379-21388
·
IF 2.22
Chang Jian,Li Hua,Yang Lei,Liu Hezhou
Surface electrolyte-philic functionalization of carbon aerogels (CAs) by surface-initiated electrochemically mediated atom transfer radical polymerization (SI-eATRP) of hydrophilic polymer brushes of poly(N-vinylpyrrolidone) (PVP) was successfully carried out. The modified composite electrode is more hydrophilic with better wettability in an aqueous electrolyte than the pristine CAs. The modified electrodes possess a higher specific capacitance of 279 F/g, excellent rate performance, and good cycling stability due to combining the advantages of both CAs and hydrophilic property. In addition, this study confirmed that higher electrode/electrolyte contact area lead to higher charge/discharge rates during the energy storage progress. Through the simple modification method, hydrophilic CAs with excellent properties were obtained which have promising application in energy conversion and storage fields.
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POLYMER BULLETIN
·
2020
·Vol. 78
·期 4
·2067-2083
·
IF 2.014
Shan Changli,Ning Chuang,Lou Jingjie,Xu Wei,Zhang Yingqiang
A series of UV-curable waterborne fluorinated polyurethane (UV-WFPU) were prepared successfully based on novel fluorinated side chain extender (F-TMP). The structure of F-TMP and particle size of UV-WFPU dispersions, contact angle (CA) and surface free energy, morphology, and damping property of UV-WFPU films were characterized through Fourier transform infrared spectroscopy, nanoparticle size analysis, contact angle test, scanning electron microscope and dynamic mechanical analysis (DMA), respectively. The results indicated that UV-WFPU dispersions had a particle size between 49.01 and 61.52 nm. The latex particle size and tan δ value of UV-WFPU films increased with the increase in F-TMP contents. The studies of surface properties confirmed that UV-WFPU films based on F-TMP had outstanding hydrophobicity properties. The highest CA of water and lowest surface free energy of UV-WFPU films reached 96.2° and 21.17 mJ/m 2 , respectively. Meanwhile, the DMA results showed UV-WFPU films possessed great damping property which had the broad temperature range enhanced by F-TMP, with a maximum value at 190.4 °C. The results of mechanical properties showed that the addition of fluorine increased in the tensile strength of the film. And these films have potential application values in the technical fields of damping, anti-corrosion and dust prevention.
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Nano Research
·
2023
·Vol. 16
·期 6
·8448-8456
·
IF 9.9
Xiong Xiaosong,Qiao Qiao,Zhou Qi,Cheng Xinbing,Liu Lili,Fu Lijun,Chen Yuhui,Wang Bin,Wu Xiongwei,Wu Yuping
Metallic lithium is regarded as one of the most promising electrode materials to break through the energy density bottleneck of current commercial lithium-ion batteries. However, the practical implementation of lithium metal anode is limited by the unstable electrode interface significantly, which directly induces a low Coulombic efficiency, short cycling lifespan, and dendritic lithium growth behavior. In this study, via in situ electropolymerization, lithiophilic and conformal polyaniline layer is developed to improve the initial lithium nucleation and plating process, reducing the interface charge transfer resistance and promoting uniform lithium plating/stripping behavior. Meanwhile, the polyaniline layer exhibits good adhesion to the substrate. As a result, the Li/Cu half cell delivers a high Coulombic efficiency of 99.1% for 400 cycles at 1.0 mA·cm −2 with polyaniline layer. In addition, long-term stable cycling at a current density of 1.0 mA·cm −2 for 1300 h has been achieved for lithium metal anode. This strategy provides a new perspective for the practical lithium metal batteries.
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CHINESE JOURNAL OF POLYMER SCIENCE
·
2021
·Vol. 40
·期 1
·85-92
·
IF 3.603
Li Zhi-Yun,Song Yi-Hu,Zheng Qiang
Payne effect and its associated weak overshoot are of importance for understanding and regulating the softening of rubber nanocomposites under large amplitude oscillations. Herein, Payne effect in diverse filled vulcanizates is investigated for generalizing the common characteristics. Master curves of strain amplitude dependent storage modulus are created with respect to microscopic strain amplitude of the matrix, revealing a matrix-dominated elastic nonlinearity being independent of type and dispersity of filler, crosslinking density and sol fraction of matrix and filler-rubber interfacial interactions. However, carbonaceous fillers with higher affinity to the rubber matrices yield lower strain amplification and higher overshoot behavior in comparison with siliceous silica. The investigation would be illuminating for preparing rubber nanocomposites with optimized reinforcement and softening performances.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 16
·21188-21196
·
IF 2.478
Sun Ying,Liu Hongbo,Liu Fangchao,Liu Gang
Recently, it is shown that the thin films of BiFeO 3 –BaTiO 3 –SrTiO 3 have ultrahigh-energy storage density. However, the energy storage properties of BiFeO 3 –BaTiO 3 –SrTiO 3 ternary bulk ceramics have not been studied. In this work, the BiFeO 3 –BaTiO 3 –SrTiO 3 ceramics have been prepared by a conventional solid-state reaction method and the dielectric and electrical energy storage properties have been studied in detail. The ceramic with the composition of 0.25BiFeO 3 –0.30BaTiO 3 –0.45SrTiO 3 is experimental evidenced to be the best with the highest dielectric permittivity in the ternary system. To suppress the dielectric loss and leakage current, 0.25BiFeO 3 –0.30BaTiO 3 –0.45SrTiO 3 has been doped with Mn. Mn-doped ceramics have the same perovskite structure but the fine grains are formed and the number of pores decreases. Mn-doping reduces dielectric loss, enlarges the thermally stable zone of the dielectric, and improves the electrical energy storage density simultaneously. 2 mol% Mn-doped 0.25BiFeO 3 –0.30BaTiO 3 –0.45SrTiO 3 has the most optimized electrical energy storage properties. The energy storage density is 1.33 J/cm 3 and the efficiency is 88.5% at 185 kV/cm. The discharge energy density is 2.7 times that of undoped 0.25BiFeO 3 –0.30BaTiO 3 –0.45SrTiO 3 and 90% stored energy can release in 120 ns.
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Journal of Ocean University of China
·
2022
·Vol. 21
·期 5
·1237-1243
·
IF 1.179
Hou Jin,Ye Yongcheng
Copper oxide-loaded zeolite 4A nanocomposites (CuO-zeolite NCs) were successfully prepared by modifying zeolite 4A with CuSO 4 aqueous solution as the copper source. Zeolite 4A showed an important role in hosting copper oxide, and CuO-zeolite NCs exhibited a controlled release of copper ions. XRD patterns confirmed the appearance of new diffraction peaks of copper oxide at 35.83° and 38.83°. CuO nanosheets formed on the surface of zeolite 4A were about 30–40nm thick over a width of 200–300nm. CuO-zeolite NCs were primarily composed of Cu, Si, Al and O, as measured by XPS. Cu 2p 3/2 and Cu 2p 1/2 peaks were fitted into two main peaks centered at 934.7eV and 954.6eV, which were attributed to Cu (II). Zeolite 4A and CuO-zeolite NC displayed reversible Langmuir isotherm (type-I) characteristics and showed maximum adsorption quantities of almost 200 cm 3 g −1 at a relative pressure of 1.0 by CO 2 adsorption-desorption experiments. The antibacterial efficiencies of the CuO-zeolite NC were 99.4%, 96.7%, and 96.8% against Pseudoalteromonas tetraodonis ( P. tetraodonis ), Micrococcus luteus ( M. luteus ), and Shewanella putrefaciens ( S. putrefaciens ), respectively. These values showed that nano CuO-loaded zeolite 4A acted as a strong bactericide against marine bacteria. CuO-zeolite NCs can be further applied to marine antifouling coating.
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JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2021
·Vol. 146
·期 6
·2445-2462
·
IF 4.626
Usman Muhammad,Yu Haojie,Wang Li,Titinchi Salam,Khan Amin,Naveed Kaleem-ur-Rehman,Nazir Ahsan,Elshaarani Tarig,Fahad Shah,Amin Bilal ul
Ferrocene (Fc)-based polymers have promising application in burning rate catalysts (BRCs) for solid composite propellants, and some of them have already been practically used. However, they have some drawbacks such as high migration during a long-time storage. Copolymers of poly(2-(methacryloyloxy) ethyl ferrocene carboxylate- co -glycidyl methacrylic acid)s (P(FHEMA -co- GMA)s) were synthesized to overcome the migration problem of Fc-based BRCs as well as to boost the burning rate (BR) of ammonium perchlorate (AP)-based propellants. The structures of the obtained P(FHEMA -co- GMA)s were confirmed by proton nuclear magnetic resonance ( 1 H NMR) and Fourier transform infrared (FT-IR) spectroscopy. Cyclic voltammetry (CV) method was used to study their electrochemical behavior, and the P(FHEMA -co- GMA)s showed redox behavior for the existence of the Fc units. Because of the formation of integrated network structures, the P(FHEMA -co- GMA)s have good anti-migration performances. The BR catalytic property of P(FHEMA -co- GMA)s were investigated by thermogravimetry (TG) and differential thermogravimetry (DTG). They showed competent catalytic effects on the thermal decomposition of AP.
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Clean Technologies and Environmental Policy
·
2023
·Vol. 25
·期 9
·2929-2949
·
IF 4.3
Soni Ashish,Das Pankaj Kumar,Kumar Sanjay
The recycling of waste plastics has been recognized as an enticing approach towards the circular economy. The post-consumer plastic products with the incorporation of agro-industrial waste were utilized for the advancement of value-added composites for structural applications. The properties of the composites, namely density, water absorption, compressive strength, flexural strength and abrasive wear, were found to influence by the type of plastics which increases the complexity in the material selection. The research proposed an integrated Analytic Hierarchy Process—Weighted Aggregated Sum Product Assessment (AHP-WASPAS) mathematical model for ranking the composites. The research identified the amalgamation of 15 wt % of rice husk ash and 15 wt % of sand with 70 wt % of polyetheretherketone (PEEK) as a suitable composite for structural applications having minimum abrasive wear and water absorption of 0.0937 cm 3 and 0.05059%, respectively. The maximum density, flexural strength and compressive strength were found to be 1.5116 g/cm 3 , 6.564 MPa and 32.7933 MPa, respectively. Spearman's rank correlation coefficient (SRCC) between the proposed AHP-WASPAS model, and AHP-Weighted Sum Method (WSM), AHP-Technique for Order Performance by Similarity to Ideal Solution (TOPSIS), AHP-COmplex PRoportional ASsessment (COPRAS), AHP-Multi-Objective Optimization on the basis of Ratio Analysis (MOORA), AHP-Multi-Attributive Border Approximation area Comparison (MABAC) and AHP-Additive Ratio Assessment (ARAS) was in the range of 0.7854–1. The sensitivity analyses have observed that the ranking is influenced by the changes in criteria weights includes, density, water absorption, compressive strength, flexural strength and abrasive wear. Moreover, the rankings are unaffected by the parameter lambda ( λ ) in the WASPAS method. The research has verified the feasibility of waste plastics and agro-industrial waste as innovative materials. Moreover, the proposed mathematical model is reliable and enhances the material selection process in the development of composites.
Graphical abstract
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JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 35
·16497-16509
·
IF 3.553
Cheng Rui Xue,Tian Fei Yang,Zhang Yun Qian,Chen Kai,Zhu Qian Jiang,Tao Zhu
Abstract Cucurbit[ n ]uril(Q[ n ])-based supramolecular frameworks assembled through outer surface interactions are characterized by their simple composition, convenient preparation, high yields and controllable structures. The most prominent characteristic of these frameworks is their diversity, with various synthesis methods, structural characteristics, structure directing agents and basic building blocks of Q[ n ]s. In this work, a symmetric tetramethyl-substituted Q[6] (TMeQ[6]) is selected as the basic building block, with three different TMeQ[6]-based supramolecular frameworks obtained from 1-, 3- and 5 mol/L aqueous H 2 SO 4 solutions, respectively. The outer surface interactions between TMeQ[6] and the adjacent SO 4 2− anions or TMeQ[6] units are the main driving forces for the formation of these frameworks, which exhibit adsorption properties for fluorophore dyes and organic isomers. These adsorption characteristics may lead to the application of these frameworks in the synthesis of solid fluorescent sensors for volatile organic compounds and the adsorptive separation of alkane isomers. Graphic abstract
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危险品化学品经营许可证（带存储）