JOURNAL OF ELECTRONIC MATERIALS
·
2023
·Vol. 52
·期 4
·2665-2675
·
IF 2.1
He Bangrong,Zou Zhengguang,Zhang Weijian,Jiang Xinyu,Mao Zheng
The Pechini sol–gel and solid-state methods were used to prepare La 0.7 Sr 0.3 Mn 0.95 Ni 0.05 O 3 specimens for analysis of their microscopic morphology, magnetic and magnetocaloric effect properties. The results showed that the average particle size of the sample made by the Pechini sol–gel method was 127.7 nm, smaller than 444.6 nm using the solid-state method . The Curie temperature ( T C ) of Pechini sol–gel (S–G) and solid-state (S-S) samples was 321.7 K and 334 K; the Δ S M was 4.15 J kg −1 K −1 and 3.11 J kg −1 K −1 under an applied magnetic field of 5 T. The samples were all second-order phase transition materials, indicating that the phase transition order was independent of the synthesis method. The T C of the S–G sample shifted to a lower temperature and the Δ S M was significant, which is desired for magnetic refrigeration. This shows that the synthesis path strongly impacts the morphology and physical properties, explaining the physical mechanism of these property changes in detail. Graphical Abstract
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
TRIBOLOGY LETTERS
·
2020
·Vol. 68
·期 3
·1-14
·
IF 2.566
Liu Chenxu,Meng Yonggang,Tian Yu
Abstract The active control of friction in oil-based lubricants was realized in the present study with the use of MoS 2 particle additives and the application of an electric field. By modifying the surface charging state of the MoS 2 particles, the dependence of potential-controlled boundary lubrication behavior on the electrical properties of the particles was demonstrated. For a diethyl succinate lubricant containing negatively charged MoS 2 particles, the coefficient of friction (COF) was reduced by 60–70% when a positive potential was applied to a lower friction pair of copper plates. After modification with poly(diallyldimethylammonium chloride), the particles were positively charged, and the COF was reduced with the application of a negative potential. The mechanisms underlying the potential control of the COF were investigated by observing the distributions of the particle additives and characterizing the tribofilms formed at different potentials. Most of the charged particles were locally concentrated near the opposite pole, and this was reversed when the electric field changed. For locally high concentrations of MoS 2 particles, a MoS 2 /MoO x tribofilm with a thickness of 100–500 nm and a loose structure formed on the lower friction pair, which significantly decreased the shear force during the friction process. Graphical Abstract
研究领域:
材料科学
·
机械工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2023
·Vol. 38
·期 5
·1266-1281
·
IF 2.7
Zhou F. Y.,Xu J. C.,Hong B.,Peng X. L.,Zeng Y. X.,Li J.,Ge H. L.,Wang X. Q.
Mesoporous SnO 2 nanospheres are synthesized by template-free solvothermal method, and then reduced graphene oxide (rGO) nanosheets are anchored on SnO 2 nanospheres (SnO 2 @rGO nanocomposites) by hydrothermal method. The gas-sensing results indicate that rGO nanosheets greatly affect the formaldehyde (HCHO) gas-sensing properties, which the response to 100 ppm HCHO gas increases with the rGO content and reach the maximum of 113.56 at 190 °C for SnO 2 @0.5%rGO sensor. Owing to the huge surface area and conductivity, rGO nanosheets absorb more oxygen molecules and extract electrons from SnO 2 nanospheres, leading to the thicker electron depletion layer of SnO 2 nanospheres. Furthermore, p-n heterojunctions at the interface of rGO nanosheets and SnO 2 nanospheres further increase the thickness of electron depletion layer. However, SnO 2 @0.8%rGO sensor presents the lower response for the new conductive pathways between the surface rGO nanosheets due to the excess of rGO content.
Graphical abstract
研究领域:
材料科学
·
传感器技术
·
纳米科技
✓ 已验证
DOI
高影响因子
ARCHIVES OF MICROBIOLOGY
·
2023
·Vol. 205
·期 5
·1-14
·
IF 2.8
Yang Yu,Zhang Yu,Liu Cong,Su Zhiqiang,Zhao Ruizhi,Zhou Jiti
In this study, three cold-tolerant phenol-degrading strains, Pseudomonas veronii Ju-A1 (Ju-A1), Leifsonia naganoensis Ju-A4 (Ju-A4), and Rhodococcus qingshengii Ju-A6 (Ju-A6), were isolated. All three strains can produce cis, cis -muconic acid by ortho-cleavage of catechol at 12 ℃. Response surface methodology (RSM) was used to optimize the proportional composition of low-temperature phenol-degrading microbiota. Degradation of phenol below 160 mg L −1 by low-temperature phenol-degrading microbiota followed first-order degradation kinetics. When the phenol concentration was greater than 200 mg L −1 , the overall degradation trend was in accordance with the modified Gompertz model. The experiments showed that the microbial agent (three strains of low-temperature phenol-degrading bacteria were fermented separately and constructed in the optimal ratio) could completely degrade 200 mg L −1 phenol within 36 h. The above construction method is more advantageous in bio-enhanced treatment of actual wastewater. Through the construction of microbial agents to enhance the degradation effect of phenol, it provides a feasible scheme for the biodegradation of phenol wastewater at low temperature and shows good application potential. Graphical abstract
研究领域:
环境微生物学
·
废水处理工程
✓ 已验证
DOI
PubMed
高影响因子
Environmental Earth Sciences
·
2022
·Vol. 81
·期 21
·1-19
·
IF 3.119
An Xiaoyu,Zuo Dianjun,Wang Fei,Liang Chao
The cement solidification/stabilization method of heavy metal contaminated soils has been promoted in engineering practice and applied on a large scale for site remediation, but it still reveals some scientific problems in the current complex and variable global extreme climate. To solve these problems, this study used waste soda residue as a composite additive, and established an innovative composite model (cement-soda) to remediate lead-contaminated soil. The innovative composite model for unconfined compressive strength (UCS) and toxic leaching properties under different conditions were investigated As well as curing and leaching mechanisms are discussed, and future industrial practice was evaluated. The results showed that the addition of soda residue improved the early (20 days) UCS of the composite curing agent for lead-contaminated soil by an average of 23.1% MPa. The UCS strength was 0.96 MPa, which was the maximum when the percentage of soda residue composite was 40%. The concentration of Pb 2+ in the leachate of the cement-soda residue (CSH) composite curing agent was greatly reduced (average 3.28 times) compared with that of a single cement in the same situation, with an average leached Pb 2+ concentration of 1.87 mg·L −1 . This finding indicates that the addition of alkali residue improved the curing effect. The curing mechanism was divided into four steps, mainly a complex physicochemical reaction between the CSH composite and soil particles. The leaching mechanism of CSH to aqueous solution is mainly the consumption of acid ions by alkaline substances. Collectively, this study will provide scientific data to support potential lead-containing soil in site remediation technologies and future large-scale engineering applications.
研究领域:
环境科学
·
土壤修复
✓ 已验证
DOI
高影响因子
Waste and Biomass Valorization
·
2020
·Vol. 12
·期 9
·4805-4823
·
IF 2.851
Shrestha Sarita,Kognou Aristide Laurel Mokale,Zhang Jin,Qin Wensheng
The plant matter, lignocellulosic biomass, is a renewable and inexpensive abundant natural resource in the world. The development of inexhaustible energy rehabilitated from agricultural waste is an alternative for fossil fuel to reduce CO 2 emission and prevent global warming. The amount of waste generated has a direct correlation with the human population. Thus, the waste generated by the community is being added to the environment as the municipal, agricultural waste, and waste produced from forest-based industries. Moreover, there are high possibilities of having environment-friendly valuable bio-based products, including biofuels, biogas, enzymes, and biochar from biomass without competing with the food supply chain. However, only a few or limited kinds of products are produced industrially. This review highlights the significance of lignocellulosic biomass. It describes the different valuable products like biochemicals, biochar, enzymes, single-cell protein, dye dispersant, and bioplastic from lignocellulosic biomass, emphasizing their applications briefly. Besides, this review also highlights the pretreatment of biomass, mainly focusing on biological pretreatment. Natural biomass utilization would lead to solving the energy shortage, food security issues, and obstacles for developing technological solutions in agriculture, agro-processing, and other related manufacturing sectors. Graphic Abstract
研究领域:
环境科学
·
生物技术
·
能源科学
✓ 已验证
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2023
·Vol. 30
·期 5
·1643-1652
·
IF 2.6
He Zhaocai,Gu Yuke,Liu Huaifei,Sun Yating,Liu Gonggang,Chang Shanshan,Bai Yuanjuan,Hu Jinbo
In recent years, wood with unique porous structure, renewability, low cost and easy processing has attracted increasing attentions, which are frequently used as a structural functional material in energy, environment, catalysis and other applications. For energy storage/conversion, high electrical conductivity of wood is desirable for its feasible application. However, carbonization treatment as commonly used method to improve the conductivity of wood will sacrifice its mechanical strength. Here, reduced graphene oxide as excellent conductive coating has been used to improve electrical conductivity of pristine wood without any carbonization process. After graphene oxide reduction process (RGO), fir wood capillary (wood lumen) skeleton with RGO conductive layers (RGO/Fe 3+ /wood) endows wood with decent anisotropic conductive. Compared with the untreated wood slice, the conductivity of RGO/Fe 3+ /wood slice is significantly increased. Besides, RGO/Fe 3+ /wood has been proved to be an effective substrate of Au catalyst as electrode in electrochemical reduction of CO 2 , which is superior to commercial carbon paper. Conductive wood slice modified by RGO shows potential application prospects in the fields of good mechanical strength required and flexible wood-derived functional devices.
研究领域:
材料科学
·
能源环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 19
·8845-8853
·
IF 4.682
Shu Ling,Liu Wei,Deng Hong-Bin
Integrating energetic materials with microelectromechanical systems (MEMS) to realize miniaturized energetic chips has shown broad application prospects in micro-spacecraft, micro-satellites, ballistic correction munitions, and smart munitions. In this work, a new type of MEMS compatible Cu/ICM-101 energetic film was successfully fabricated on copper substrates by in-situ electrochemical synthesis, the morphology and ignition property of which can be effectively controlled by adjusting the voltage and electrochemical deposition time. The morphology, composition, thermal properties, and ignition performance of as-prepared Cu/ICM-101 films were characterized by scanning electron microscopy, X-ray diffraction, differential scanning calorimetry, and pulsed laser. The results show that the as-prepared Cu/ICM-101 films possesses nano porous framework structure with an exothermic heat of 1800.9 J·g −1 and a thermal decomposition peak temperature of 256.4 °C. In addition, the flame height and ignition duration of which reach 10 mm and 300 μs, respectively. This work provides a reference for the integration and application of energetic materials in MEMS systems.
研究领域:
材料科学
·
微机电系统
·
能量材料
✓ 已验证
DOI
高影响因子
RARE METALS
·
2023
·
IF 8.8
Zhang Lei,Meng Qian-Kun,Feng Xiang-Ping,Shen Ming,Zhang Yu-Qing,Zhuang Quan-Chao,Zheng Run-Guo,Wang Zhi-Yuan,Cui Yan-Hua,Sun Hong-Yu,Liu Yan-Guo
The high energy density and stability of solid-state lithium metal batteries (SSLMBs) have garnered great attention. Garnet-type oxides, especially Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 (LLZTO), with high ionic conductivity, wide electrochemical window, and stability to Li metal anode, are promising solid-state electrolyte (SSEs) materials for SSLMBs. However, Li/LLZTO interface issues including high interface resistance, inhomogeneous Li deposition, and Li dendrite growth have hindered the practical application of SSLMBs. Herein, a multi-functional Li–SnF 2 composite anode with Li, LiF, and Li-Sn alloy was specifically designed and prepared. The composite anode improves the wettability to LLZTO, constructing an intimate contact interface between it and LLZTO. Meanwhile, ionic/electronic conductive paths in situ formed at the interface can effectively uniform Li deposition and suppress Li dendrite. The solid-state symmetric cell exhibits low interface resistance (11 Ω·cm 2 ) and high critical current density (1.3 mA·cm −2 ) at 25 °C. The full SSLMB based on LiFePO 4 or LiNi 0.5 Co 0.2 Mn 0.3 O 2 cathode also shows stable cycling performance and high rate capability. This work provides a new composite anode strategy for achieving high-energy density and high-safety SSLMBs. Graphical abstract
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
Biochar
·
2022
·Vol. 4
·期 1
·1-17
·
IF 11.452
Che Naiju,Liu Na,Li Yinhui,Li Chao,Liu Yanli,Li Chengliang
Graphene-based composite aerogel doped with other low-cost materials can reduce the cost and promote the use in water treatment. This work prepared ball-milled biochar/reduced graphene oxide aerogel (BC/rGA) using GO and low-cost ball-milled biochar (BC) in a certain proportion with the freeze-thawing technique and sol–gel method, and applied BC/rGA on the Cr(VI) removal from aquatic environments. The characterization results showed that aerogel had a honeycomb briquette three-dimension (3D) and mesoporous structure with interconnected pores, and proved the preparation progress of aerogel in principle. Compared with GO, rGA and BC/rGA had better adsorption performance with 3D structure and well-developed pores, and BC/rGA with the mixture ratio of BC and GO of 1:4 was more appropriate. The adsorption kinetics data of rGA and BC/rGA (1:4) were fitting well with the pseudo-second-order model ( R 2 > 0.951), and the isotherm adsorption results were fitting the Langmuir model well ( R 2 > 0.974). The results demonstrated that the adsorption process was monolayer and endothermic adsorption involving chemisorption. Additionally, the adsorption capacities of rGA and BC/rGA (1:4) at solution pH 2 were 3.71 and 3.89 times greater than those at solution pH 8, respectively. High background ion strength and low temperature slightly inhibited the adsorption of Cr(VI) by both rGA and BC/rGA (1:4) . The adsorption mechanisms of Cr(VI) on rGA and BC/rGA (1:4) were electrostatic interaction, reduction and ion exchange. The use of BC/rGA could reduce the cost and promote the green reuse of agricultural waste. Overall, BC/rGA could be used as a promising green adsorbent alternative for the feasible treatment of heavy metal contaminated water. Graphical Abstract
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2021
·Vol. 127
·期 10
·1-9
·
IF 2.584
Meng Ke,Li Wenhua,Tang Xingui,Guo Xiaobin,Liu Qiuxiang,Jiang Yanping
Ferroelectric materials with the typical perovskite structure are widely used in capacitors, ultrasonic devices, oil drilling, transducers, and other fields. Lead-lanthanum-zirconium-titanate ceramics co-doped with Sn and Ba , have been widely investigated. However, there is little attention has been focused on the dielectric properties of barium-lanthanum-zirconium-titanate. Thus, in this work, Sn doped Ba 0.955 La 0.03 Zr 0.02 Ti 0.98 O 3 ferroelectric ceramics were prepared via a classical high-temperature solid state reaction. Scanning Electron Microscopy (SEM) was used to observe the surface appearance of ceramics. The X-ray diffraction (XRD) patterns at room temperature, indicate that the ceramics are well crystallized. Impedance properties and dielectric properties reflect the characteristic of typical high temperature dielectric relaxation behavior. The conductive activation energy and the relaxation activation energy are obtained through the calculation of the Arrhenius law. The fitting results show that the dielectric relaxation behavior at high-temperature, was related to the oxygen defect. The electrical modulus verified the partial short-range carrier migration, also contribute to the high-temperature dielectric properties.
研究领域:
材料科学
·
固态物理
✓ 已验证
DOI
高影响因子
Nature Communications
·
2021
·Vol. 12
·期 1
·1-8
·
IF 14.919
Wan Quan,Yang Mei,Hu Jiaqi,Lei Fang,Shuai Yajun,Wang Jie,Holland Chris,Rodenburg Cornelia,Yang Mingying
Silk fibre mechanical properties are attributed to the development of a multi-scale hierarchical structure during spinning. By careful ex vivo processing of a B. mori silkworm silk solution we arrest the spinning process, freezing-in mesoscale structures corresponding to three distinctive structure development stages; gelation, fibrilization and the consolidation phase identified in this work, a process highlighted by the emergence and extinction of ‘water pockets’. These transient water pockets are a manifestation of the interplay between protein dehydration, phase separation and nanofibril assembly, with their removal due to nanofibril coalescence during consolidation. We modeled and validated how post-draw improves mechanical properties and refines a silk’s hierarchical structure as a result of consolidation. These insights enable a better understanding of the sequence of events that occur during spinning, ultimately leading us to propose a robust definition of when a silkworm silk is actually ‘spun’.
研究领域:
材料科学
·
生物物理学
·
生物材料
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）