Journal of Thermal Science
·
2020
·Vol. 29
·期 2
·477-485
·
IF 1.972
Xu Qian,Akkurt Nevzat,Zou Zhenwei,Liu Yang,Feng Junxiao,Yu Chuqiao,Ding Chong,Xiong Yaxuan,Zhou Jingzhi,Zang Yong,Ding Yulong
Organic and inorganic phase change materials (PCMs) are considered potential materials for thermal energy storage (TES) with different phase change characteristics. In this study, a novel organic-inorganic composite phase change material (PCM) called disodium hydrogen phosphate dodecahydrate-lauric-palmitic acid (D-LA-PACM) was prepared. Expanded graphite (EG) was selected as the support material, and the novel organic-inorganic form-stable PCM called D-LA-PAPCM/EG was prepared using the vacuum adsorption method. Differential scanning calorimetry, Fourier transform infrared spectroscopy, X-ray diffraction, leakage testing, melting and solidification cycle testing, thermal conductivity testing, scanning electron microscopy observation of the micromorphology, and other characterization methods were used to study the micro structure and morphology, thermal physical parameters, thermal conductivity, stability of the PCMs, and the comprehensive material properties of D-LA-PAPCM under the composite action of EG. Results indicated that the melting and freezing temperatures and latent heats of D-LA-PAPCM/EG were measured to be 31.6°C and 34.3°C and 142.9 and 142.8 J/g, respectively. Although some of the lauric-palmitic acid (LA-PA) and disodium hydrogen phosphate dodecahydrate (DHPD) separated in the multiple porous structures of EG after 1000 cycles, they could still absorb and release latent heats independently, with D-LA-PAPCM/EG still exhibiting good thermal stability. The thermal conductivity of D-LA-PAPCM/EG was 1.361 W/(mK). Therefore, the material and thermal properties of the prepared D-LA-PAPCM/EG indicate that it could be well used as a feasible material for energy-saving phase change floor units in indoor TES systems.
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JOURNAL OF MATERIALS SCIENCE
·
2015
·Vol. 51
·期 3
·1344-1353
·
IF 2.371
Yang Xia,Meng Nannan,Zhu Yuanchao,Zhou Yifeng,Nie Wangyan,Chen Pengpeng
In this work, molybdenum disulfide (MoS 2 ) nanosheets were employed to enhance the mechanical and thermal properties of chitosan (CS), which was one of the most promising biomaterials. In order to promote a homogeneous dispersion of MoS 2 and improved interface interactions between CS and fillers, carboxyl functionalization was subjected to the exfoliated MoS 2 nanosheets by chemical conjugation with thioglycolic acid before compositing with CS. Afterward, the CS/MoS 2 – g –COOH composite films were prepared by a simple solution blending method. Micromorphology characterizations showed that MoS 2 – g –COOH nanosheets dispersed much better than unmodified MoS 2 nanosheets, which was considered to be quite beneficial for the enhanced properties of CS nanocomposites. DMA results indicated that the mechanical properties of CS were improved by incorporating with MoS 2 – g –COOH nanosheets compared with neat CS and unmodified MoS 2 -filled CS. The thermal stability of CS/MoS 2 – g –COOH was also improved. This work demonstrated a promising route to prepare MoS 2 -based polymer nanocomposites with excellent performances.
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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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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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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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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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高影响因子
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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高影响因子
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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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2015
·Vol. 77
·期 3
·666-674
·
IF 1.532
Cui Wei,Wang Shixing,Peng Jinhui,Zhang Libo,Zhang Gengwei
Abstract We prepared the catechol-functionalized nanosilica for adsorption of germanium (Ge) ions from aqueous media. The functionalized nanosilica was characterized by FTIR, TGA, TEM, BET, and XPS. The influence of pH, Ge initial concentration, and time of the adsorption process was investigated. Under the optimum condition, the maximum adsorption capacity of Ge ions was 0.048 mg m −2 at pH 4.5. The adsorption mechanism is the chelating interaction between hydroxyl and Ge(OH) 4 . The functionalized nanosilica was able to selectively adsorb Ge ions from tellurium(IV) and boron. Langmuir isotherm was found to better fit the experiment data rather than Freundlich isotherm. The kinetics of the adsorption process of Ge ions on the functionalized nanosilica was investigated using the pseudo-first-order and pseudo-second-order models, and the results indicated that the pseudo-second order equation model provided the best correlation with the experimental results. Graphical Abstract
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危险品化学品经营许可证（带存储）