JOURNAL OF APPLIED POLYMER SCIENCE
·
2014
·Vol. 131
·期 19
·
IF 1.64
Hailu Liu,Hao Pang,Juhua Ou,Lei Zhang,Yongqiang Dai,Bing Liao
Fluidity and slump loss are main technical indicators for the quality of concrete. They are related to the dispersion of cement and hydration process, and are greatly affected by the structure of superplasticizers (SPs). For the purpose of obtaining SPs with excellent fluidity and slump retention, water-soluble cross-linked polycarboxylate ether copolymers (CLPCs) of acrylic acid and alkenyl alcohol type polyoxyethylene ether were synthesized. In order to gain full understanding of the effect of cross-linked SPs on the properties in cementitious system, properties of the new SPs in cement paste were compared to those of traditional ones without cross-linking agents. Mortar tests showed that CLPC performed obvious slow-release function and kept about 10 mm higher than its initial paste flow after 150 min, while PC incurred loss of 15 mm after 150 min. Adsorption of CLPC on cement resulted in zeta potential being roughly the same as that in the case of PC, and enabled more effective slump retention to cement suspensions by rheological property tests. Ettringite peaks disappeared for CLPC on 1-day curve and reappeared after 35 days, and the intensity of CH peaks for CLPC appeared weaker than Blank and PC after 1 day. The microstructure of CLPC after 1 day showed a very dense structure of smaller and thinner crystallites, which indicated that the early hydration was greatly delayed. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 40856.
研究领域:
建筑材料
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化学工程
·
土木工程
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 8
·4112-4118
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IF 2.936
Bin Yue,Xinlu Wang,Jinxian Wang,Jing Yao,Xinru Zhao,Hongbo Zhang,Wensheng Yu,Guixia Liu,Xiangting Dong
The Au-doped Li1.2Ni0.7Co0.1Mn0.2O2 (Au = 0%, 1%, 2%, 3%, 4%) nanofibers are successfully prepared by electrospinning technology. The impact of Au doping on the structure, morphology and electrochemical properties of samples is studied in detail. The X-ray diffraction patterns demonstrate that appropriate Au-doping does not significantly change the structure of Li1.2Ni0.7Co0.1Mn0.2O2. Scanning electron microscope images revealed the electrospun nanofibers have uniform particle size in the range of 300–400 nm. The optimum doping amount of Au is 2% in Li1.2Ni0.7Co0.1Mn0.2O2 to obtain high discharge capacity and excellent capacity retention. Electrochemical impedance spectroscopy test results elucidated that the LNCMA-2% cell has excellent Li+ electrical conductivity and lower charge transfer resistance. The results show that stable structure with good particle contact of the Au-doped cathode materials can enhance electrochemical properties, which can be interpreted as an important inhibition of phase transitions and increased charge transfer impedance during cycling.
研究领域:
材料科学
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能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Polymer Science
·
2024
·
IF 3.4
Shuangjie Liu,Jialin Yu,Yongping Hao,Feng Gao,Mo Zhou,Lijun Zhao
Using Nafion212 membrane and TEOS solution as raw materials, Nafion212/SiO2 composite membranes were prepared. In the in situ sol-gel reaction process, a series of Nafion/SiO2 composite membranes were prepared by varying the reaction temperature and reaction time. The effects of different modification schemes on Nafion/SiO2 composite membranes were studied using SEM, EDS, TEM, TGA, XRD, and mechanical tensile experiments, among other methods. The results show that Nafion/SiO2 composite membranes prepared at 3°C exhibit a well-separated phase structure and excellent water retention properties, with a water uptake of 29.23% and a swelling ratio of 24.25%. These membranes also demonstrate outstanding physical and chemical performance, with a maximum tensile stress of 13.6 MPa and an elongation at a break of 270%. At 110°C, the proton conductivity of the Nafion/SiO2 composite membrane reaches 0.172 S/cm, meeting the requirements for high-temperature proton exchange membrane fuel cells.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2016
·
IF 5.267
Xinggang Wang,Shaoyu Lü,Chunmei Gao,Chen Feng,Xiubin Xu,Xiao Bai,Nannan Gao,Jinlong Yang,Mingzhu Liu,Lan Wu
To minimize the negative impact of nitrogen and phosphorus pollution from wastewater and improve fertilizer use efficiency, a novel multifunctional slow-release compound fertilizer was prepared by recovery of NH4+ and H2PO4– from aqueous solutions onto amphoteric straw cellulose (ASC) adsorbent. The effects of adsorbent dosage, solution pH, contact time and ionic strength on adsorption were investigated. The adsorption quickly reached equilibrium. The maximum NH4+ adsorption capacity of ASC was 68.4 mg g–1 at around pH 7.0, whereas it was 38.6 mg g–1 for H2PO4– adsorption at pH 5.0. Moreover, the feasibility of reusing the nutrients-laden carrier material as a multifunctional slow-release compound fertilizer was determined. The study demonstrated the product with excellent slow-release and water-retention properties. Thus, it could improve soil moisture content and reduce soil moisture evaporation rate and was economical and environmentally friendly for application in horticulture and agriculture.
研究领域:
环境科学
·
农业科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Ao Gao,Wei Lu,Yuntao Liang,Zhenglong He,Jinliang Li,Yong Sun,Shuanglin Song
A multifunctional LiCl@PAM powder material with both fire prevention and dust suppression functions was prepared. It features simple synthesis, convenient production processes, and sprayability. The physical and chemical structure, water absorption/retention and thermal conductivity of LiCl@PAM gel were investigated. Experimental studies were conducted on the effects of LiCl@PAM gel powders with different salt contents on lignite coal spontaneous combustion (CSC) and dust suppression. Results from FTIR, SEM, water absorption and retention tests, swelling tests, infrared thermal imaging, low-temperature oxidation experiments, thermogravimetric analysis, immersion tests and simulated dust suppression tests showed that the 20 wt%LiCl@PAM gel powder exhibited the best overall performance. This gives it significant advantages in both preventing CSC and suppressing dust. In terms of CSC inhibition, compared to raw coal, the crossing point temperature of 20 wt%LiCl@PAM/coal increased by 33.9 °C and the inhibition rate reached 74.37 % at 90 °C. The apparent activation energies increased by 8.5 kJ/mol (at 30–90 °C) and 10.9 kJ/mol (at 110–190 °C), respectively. In terms of dust suppression, 20 wt%LiCl@PAM showed excellent dust suppression and wetting properties through the combined effect of the strong hygroscopicity of LiCl and the adhesive and agglomeration ability of PAM. This LiCl@PAM powder material provides a novel multifunctional integrated material and solution for the prevention of CSC and dust hazards.
✓ 已验证
产品关联
DOI
高影响因子
POLYMER BULLETIN
·
2024
·
IF 3.1
Yu Tingting,Wang Xu,Hu Yuehang,Zhao Yang,Zhu Cenming,Cheng Liang,Kong Linghan,Zheng Han,Yue Baoshan,Zhan Jianbo,Yu Zhenhua,Wang Hao,Zhang Ying
In this work, a bio-based resin of acrylated epoxidized soybean oil (AESO) mixed with three types of active diluents (Isoborneol methacrylates [IBOMA], tripropylene glycol diacrylate [TPGDA], and Ethoxylated trimethylolpropane triacrylate [ETPTA]) is used to form a protective UV-curable coating film on calcium alginate water-carrying microspheres (CA-WCMs). Calcium alginate microspheres (CAMs) have previously been used to encapsulate only ester soluble or oil-in-water core materials, thus limiting their application. After UV-curing with an increased active diluent dose, the pencil hardness, pendulum hardness, and mechanical strength of the CAMs increased. A photopolymerization kinetics study reveals that the maximum double bond (C=C) conversion rates of AESO-IBOMA, AESO-TPGDA, and AESO-ETPTA are 95, 92, and 86%, respectively, and the maximum conversion rate of C=C bond is 87% in their mixed system. Additionally, the water retention rate of the water-carrying microspheres (WCMs) increased with an increasing number of coating layers, plateauing after the number of layers exceeded four. The water retention is favorable, with more than 75% of the water stored for a duration of 50 days. Overall, the cost-effective and environmentally friendly method has shown encouraging results in the acquisition of water-absorbing CAMs, with the potential to overcome existing implementation constraints.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
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2025
·
IF 19
Di Yang,Liqiang Zhang,Tongtong Yu,Changhe Du,Liucheng Wang,Wenpeng Wang,Yange Feng,Weimin Liu,Daoai Wang
Self-lubricating porous polyimides (PPI) are widely used in aerospace, microelectronics and other fields because of their excellent properties. The porous structure of PPI can present drawbacks, such as reduced surface strength, elastic collapse and diminished wear resistance, making the exploration of strategies to minimize surface wear of PPI essential for extending its service life and enhancing material stability. In this work, a novel self-lubricating porous polyimide (PPI-gel-TAM) with outstanding tribological properties is synthesized, exhibiting high oil-bearing capacity and superior retention stability. PPI-gel-TAM attains macro-superlubricity, exhibiting a coefficient of friction (COF) of ≈0.007. The wear rate of the PPI decreased significantly from 3.52 × 10 −5 to 2.81 × 10 −8 mm 3 ·N −1 ·m −1 after the incorporation of tannic acid-functionalized MoS 2 nanosheets (TA-MoS 2 ). The attainment of superlubricity is enabled by a self-adaptive confined lubrication strategy, which integrates the synergistic effects of four mechanisms: oil supply from the porous structure, the shear-thinning properties of lubricants, the interaction between functionalized MoS 2 and oil molecules, and the formation of a protective tribofilm. This study presents a novel and effective strategy for self-lubricating porous polymers to maintain both superior oil content and retention capabilities, while also exhibiting exceptional tribological properties.
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2024
·Vol. 35
·期 38
·385705
·
IF 2.9
Yongguang Xiao,Lisha Yang,Yong Jiang,Siwei Liu,Gang Li,Jun Ouyang,Minghua Tang
Lu doped Hf0.5Zr0.5O2 (HZO) ferroelectric films were prepared on Pt/TiN/SiO2/Si substrate by chemical solution deposition method, and an interfacial engineering strategy for improving the ferroelectric property was explored by capping the Lu doped HZO films with a cerium oxide layer. Compared with the Lu doped HZO film without the CeOx coating layer, the Lu doped HZO film with the CeOx coating layer has a larger remanent polarization (2Pr = 34.72 µC cm−2) and presents weaker wake-up behavior, which result from the higher orthogonal phase ratio and the lower oxygen vacancy of the CeOx coated Lu doped HZO film. In addition, the CeOx coating can remarkably improve the fatigue resistance and retention performance of the Lu doped HZO films. It is hoped that the results can provide an effective approach for the realization of high-performance and highly reliable hafnium oxide based ferroelectric thin films.
研究领域:
材料科学
·
铁电材料
·
薄膜
✓ 已验证
DOI
高影响因子
COMPOSITES COMMUNICATIONS
·
2019
·
IF 0
Xinxin Ding,Yuyao Li,Yang Si,Xia Yin,Jianyong Yu,Bin Ding
There is a critical need for air filters with the abilities of removing particles effectively and allowing air to pass through easily to protect the public from increasingly serious air pollution; however, creating such a filter medium has proven to be extremely challenging. Herein, an air filtration material equipped with remarkable electrostatic effect is fabricated by electrospining polyvinylidene fluoride (PVDF) as the matrix polymer and silicon dioxide nanoparticles (SiO 2 NPs) modified by γ-glycidoxypropyl trimethoxysilane (GPS) as the charge enhancer. The premise of the design is that GPS modified SiO 2 NPs can be uniformly distributed in PVDF fibers, generating abundant stable interfacial charges. Benefiting from the monodisperse state of GPS@SiO 2 NPs, the resultant PVDF/GPS@SiO 2 nanofibrous membrane exhibits remarkable electret effect with a surface potential of 12.4 kV and high filtration performance with a quality factor of 0.14, which has never been reported before. We envision that this work can provide new insight into the design and development of electret air filter media for various applications.
研究领域:
材料科学
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环境工程
·
纳米技术
✓ 已验证
产品关联
DOI
Nanomaterials
·
2022
·Vol. 13
·期 1
·39
·
IF 5.719
Yuan-Dong Xu,Yan-Ping Jiang,Xin-Gui Tang,Qiu-Xiang Liu,Zhenhua Tang,Wen-Hua Li,Xiao-Bin Guo,Yi-Chun Zhou
Resistive random-access memory (RRAM) is a promising candidate for next-generation non-volatile memory. However, due to the random formation and rupture of conductive filaments, RRMS still has disadvantages, such as small storage windows and poor stability. Therefore, the performance of RRAM can be improved by optimizing the formation and rupture of conductive filaments. In this study, a hafnium oxide-/aluminum-doped zinc oxide/hafnium oxide (HfO2/Al-ZnO/HfO2) tri-layer structure device was prepared using the sol–gel method. The oxygen-rich vacancy Al-ZnO layer was inserted into the HfO2layers. The device had excellent RS properties, such as an excellent switch ratio of 104, retention of 104s, and multi-level storage capability of six resistance states (one low-resistance state and five high-resistance states) and four resistance states (three low-resistance states and one high-resistance state) which were obtained by controlling stop voltage and compliance current, respectively. Mechanism analysis revealed that the device is dominated by ohmic conduction and space-charge-limited current (SCLC). We believe that the oxygen-rich vacancy concentration of the Al-ZnO insertion layer can improve the formation and rupture behaviors of conductive filaments, thereby enhancing the resistive switching (RS) performance of the device.
研究领域:
材料科学
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电气工程
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纳米技术
·
半导体器件
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）