Petroleum
·
2021
·
IF 0
Heng Wang,Junying Hu,Zhi Yang,Zebin Yin,Qi Xiong,Xiankang Zhong
A highly efficient and environment-friendly scale inhibitor (MA-VA-VS) was synthesized via free radical solution polymerization method, where maleic anhydride (MA), vinyl acetate (VA) and vinyl sulfonate (VS) acted as monomers, while ammonium persulfate was used as initiator. The inhibition performance and the structure as well as properties was characterized using static jar measurement and dynamic test, Fourier transform infrared spectroscopy and thermogravimetric analysis. The surface morphology and composition of scale formed in the solution were examined using scanning electron microscopy and X-ray diffraction, respectively. The binding energies of inhibitor with calcite (104) face were calculated using Materials Studio 2017 (MS) at 323 K. The results show that the inhibition efficiency gradually increases with increasing inhibitor concentration. While as the Ca 2+ concentration increases, the efficiency first increases and then decreases. With the increase in temperature or pH, the efficiency generally decreases. It is confirmed that the inhibition efficiency can reach 91.4% when 150 mg/L MA-VA-VS is used in a flow condition. Both the calculated binding energy and inhibition performance evaluation results demonstrate that the scale inhibition performance of MA-VA-VS is better than a commercial scale inhibitor (HPMA). The excellent inhibition performance of this inhibitor is due to its chelation and dispersion properties.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
CARBON
·
2024
·
IF 10.5
Xi Wang,Yujie Gao,Jianing Guo,Mingxing Wu
Carbon-based hole transport layer (HTL)-free all-inorganic perovskite solar cells (C-PSCs) exhibit advantages of simplified preparation procedure, high stability, and low cost, showcasing significant application potential. Nonetheless, the development of C-PSCs requires overcoming challenges such as the misalignment of energy levels between carbon counter electrode and the CsPbBr₃ perovskite, abundant defects at the perovskite/carbon back interface, and the carbon counter electrode's low conductivity. Herein, VS₄ and VO-deposited carbon nanofibers (CNF), termed VS₄@CNF and VO@CNF respectively, have been synthesized to adjust the work function and improve the conductivity of the carbon counter electrode. CsPbBr₃-based C-PSCs employing VS₄@CNF and VO@CNF as counter electrodes yield power conversion efficiencies of 7.88 % and 8.80 %, indicating great PCE enhancements of 15.4 % and 28.8 % as compared with the device with unmodified CNF counter electrodes. This improvement is attributed to the optimized conductivity and adjusted work function of the counter electrodes, which can optimize the energy level alignment, thereby enhancing charge carrier extraction and transport while effectively inhibiting recombination. Furthermore, VS₄@CNF and VO@CNF demonstrate a notable passivation effect on defects at the back interface. This study offers a valuable path for the design of novel carbon counter electrodes and the modification of the back interface in carbon-based all-inorganic C-PSCs.
研究领域:
材料科学
·
能源技术
·
光电转换
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2014
·Vol. 39
·期 21
·10892-10901
·
IF 2.93
C.D. Gu,M.L. Huang,X. Ge,H. Zheng,X.L. Wang,J.P. Tu
Two NiO products with different microstructures have been obtained using a traditional NaOH-induced aqueous-phase precipitation and a homogeneous precipitation in choline chloride/urea mixture-based deep eutectic solvent (DES), respectively. The synthesis processes play a key role in the structure construction of NiO precursors as well as the final NiO products, and possible formation mechanisms are proposed. The DES-based homogeneous precipitation method provides plentiful nucleation sites , moderate crystal growth process and possible template effect, which could conduce to the production of flower-like NiO with continuously self-supporting mesoporous structure assembled by tiny grains. The flower-like NiO electrode exhibits higher current density , faster charge-transfer process, better electrode accessibility, and improved stability for methanol electro-oxidation in an electrolyte of 0.1 M CH 3 OH + 0.005 M KOH than the disorderly aggregated NiO nanoparticles . We believe that the DES-based homogeneous precipitation method can provide an effective approach to fabricate advanced electrocatalyst materials with homogeneous and well-assembled microstructure.
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF TECHNOLOGY AND DESIGN EDUCATION
·
2024
·Vol. 34
·期 5
·1687-1704
·
IF 2
Cai Lu
Based on Folk theory, Media Equation, and AI literacy research, the study constructed an interview outline and selected 72 students in 4th and 5th grade in three primary schools located in the Minhang and Putuo districts of Shanghai (two in the Minhang district and one in the Putuo district) as the study participants for focus group interviews. The study found that the availability of voice interaction is an essential basis for children to judge the level of intelligence of a machine; additionally, chatting is also the starting point for young children to build a close relationship with AI. Although AI cannot replace their friends, it can become a friend to them. While children expect the future of AI to be beyond the current level of intelligence and emotion and to enable the full use of machines in multiple scenarios and various fields, they are also concerned about issues such as privacy breaches that devices may cause in the future and believe that technology should not develop outside of human control.
研究领域:
教育心理学
·
人机交互
·
儿童发展研究
✓ 已验证
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2018
·
IF 4.61
Mengdi Jiang,Qingyue Zhang,Yuefei Ji,Deyang Kong,Junhe Lu,Xiaoming Yin,Quansuo Zhou,Corinne Ferronato,Jean-Marc Chovelon
Peroxymonosulfate (PMS) is increasingly used as an oxidant for in situ remediation of organic contaminants in soil and groundwater. In this study we demonstrated that sulfamethazine (SMZ) could be transformed by PMS in the absence of any activators. Such transformation was ascribed to the oxidation by PMS per se, rather than free radicals (SO 4 − or HO ), superoxide (O 2 − ), or singlet oxygen ( 1 O 2 ). The aniline moiety of SMZ molecule was the reactive site for PMS oxidation, leading to the formation of nitrated products. This nitration pathway in fact played a significant role in the removal of SMZ in activated PMS oxidation processes. For instance, it contributed 26% of the total SMZ transformation, while SO 4 − contributed the other 74% during the removal of SMZ, in Co(II)/PMS oxidation process with initial PMS and Co(II) concentrations of 1.0 mM and 0.1 μM, respectively. Similar nitration reaction also occurred to other sulfonamide antibiotics bearing an aniline moiety upon the reaction with PMS. Since nitrated sulfonamide antibiotics appear more persistent than the parent compounds and may cause other environmental problems, such a pathway should not be desired. Therefore, PMS might not be an ideal oxidant for the treatment of sulfonamide antibiotics and other compounds having aniline moieties, especially in subsurface remediation practices where efficient activation of PMS represents a major challenge.
研究领域:
环境科学
·
化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2025
·
IF 4.7
Qingqing Yang,Chaosheng Yuan,Yongfu Liang,Xiang Zhu,Zheng Wang,Kai Shi,Xuerui Cheng,Lei Su
The phase transition of pyrrole was studied under static pressure and dynamic pressure by in situ Raman spectroscopy. Under static compression, pyrrole underwent three phase transitions: a liquid-to-crystal (phase Ⅰ) transition at 1.15 GPa, followed by transformation into phase II at 7.45 GPa and the start of amorphous phase transition at 16 GPa. Under dynamic compression, pyrrole was compressed into an amorphous phase as the pressure increased from 0.71 GPa to 5.02 GPa, 8.07 GPa, 10.30 GPa, 11.30 GPa and 12.84 GPa within 5 ms, respectively. Rapid compression rate and high pressure provide a greater degree of disorder in amorphous pyrrole by fitting the partial Raman peak linewidth with pressure. During the pressure relief process, the amorphous pyrrole crystallized and transformed into phase II at 3.20 GPa and then reverted to its initial liquid state at around 0.55 GPa. The phase behaviors can be attributed to different solidification mechanisms of liquid pyrrole induced by different compression rates under the two compression conditions.
研究领域:
凝聚态物理
·
材料科学
·
高压科学
·
光谱学
✓ 已验证
产品关联
DOI
高影响因子
FOOD HYDROCOLLOIDS
·
2017
·
IF 4.747
Lingli Deng,Xuefan Kang,Yuyu Liu,Fengqin Feng,Hui Zhang
In this study, the gelatin, zein , and gelatin/zein films were fabricated by electrospinning and solvent casting, respectively. Scanning electron microscopy , differential scanning calorimetry , Fourier transform infrared spectroscopy and water contact angle measurements were performed to characterize the morphology, molecular interactions, thermal behavior, and surface hydrophilicity of the electrospun and casted films. Results showed that the zein particles prevented the gelatin chains from aggregating intra-molecularly in the casted films due to heterogeneous mixing, while strong hydrogen bonding was formed in the nanofibrous film as a result of homogeneous mixing. Interestingly, the gelatin/zein nanofibrous film had a hydrophobic surface (water contact angle of 118.0°), while the casted gelatin/zein film had a hydrophilic surface (water contact angle of 53.5°). The confocal laser scanning microscopy observations suggested that the zein particles were well dispersed in the gelatin network to maintain the nanofibrous structures after immersion in water or ethanol, leading to the improved solvent resistance.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Jiangfan Liao,Guoqiang Lv,Xianghua Zhao,Tao Zhou,Renjie Li,Qingrun Xie,Xiufeng Li,Mingli Xu,Yongsheng Ren,Wenhui Ma
Photoelectrochemical (PEC) water splitting represents a promising strategy for sustainable hydrogen production. The development of highly efficient photoelectrocatalysts that facilitate charge transport and minimize overpotential is therefore of great significance. In this work, a synergistic approach was employed by constructing a PCN/WS 2 heterojunction through electrostatic self-assembly and introducing sulfur vacancies via HF etching. The as-prepared PCN/WS 2 -Vs composite demonstrated outstanding HER performance: under illumination, the overpotential at 10 mA·cm −2 decreased from 157 to 73 mV, and the Tafel slope was reduced from 223 to 114 mV·dec -1 . Moreover, the optimized photocathode delivered an applied bias photon-to-current efficiency (ABPE) of 1.33 % and achieved a photocurrent density of 7.65 mA·cm −2 at 0 V (vs. RHE). Remarkably, the photocathode enabled stable continuous operation for 150 h under simulated solar irradiation. Spectroscopic characterizations (XPS, UV–vis, and EPR) confirmed band structure modulation, including a narrowed bandgap and a downward-shifted valence band, which collectively promoted efficient charge separation and transfer. These results highlight the synergistic contributions of p-n heterojunction formation and sulfur-vacancy engineering toward enhanced PEC-HER, offering an effective strategy for designing efficient, durable, and noble-metal-free photoelectrocatalysts.
研究领域:
材料科学
·
能量转换
·
光催化
·
电化学
·
纳米材料
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Chemistry
·
2021
·
IF 5.221
Lanlan Yu,Zhun Deng,Wenbo Zhang,Shuli Liu,Feiyi Zhang,Jianjian Zhou,Chunhua Ma,Chenxuan Wang
Ions are crucial in modulating the protein structure. For the free ions in bulk solution, ammonium is kosmotropic (structure forming) and guanidinium is chaotropic (structure breaking) to the protein structure within the Hofmeister series. However, the effect of immobilized ions on a protein surface is less explored. Herein, we explored the influence of two immobilized cations (ammonium in the side chain of lysine and guanidinium in the side chain of arginine) on the folding and assembly of melittin. Melittin adopts an α-helix structure and is driven by hydrophobic interactions to associate into a helical bundle. To test the influence of immobilized cations on the peptide structure, we designed the homozygous mutants exclusively containing ammonium (melittin-K) or guanidinium (melittin-R) and compared the differences of melittin-K vs. melittin-R in their folding, assembly, and molecular functions. The side chains of lysine and arginine differ in their influences on the folding and assembly of melittin. Specifically, the side chain of R increases the α-helical propensity of melittin relative to that of K, following an inverse Hofmeister series. In contrast, the side chain of K favors the assembly of melittin relative to the side chain of R in line with a direct Hofmeister series. The opposite regulatory effects of immobilized cations on the folding and assembly of melittin highlight the complexity of the noncovalent interactions that govern protein intermolecular architecture.
研究领域:
生物物理学
·
蛋白质化学
·
分子生物学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Ji-Hao Zuo,Chao Wei,Peng Cheng,Xi Yan,Yan Chen,Wan-Zhong Lang
Permeability and mechanical strength normally present an opposite trend for separation membranes . There is a trade-off line of permeability vs. tensile strength for the prepared poly(vinylidene fluoride) (PVDF) membranes via thermally induced phase separation (TIPS) method. In this work, TIPS-prepared PVDF membranes were fabricated with water (PVDF T-water ) and air (PVDF T-air ) as quenching bath for comparatively studying. PVDF T-air membranes present larger average pore size, higher permeability and better mechanical strength than those of PVDF T-water membranes due to the lower cooling rate of air bath. It is wonderful that all PVDF T-air membranes can break though the trade-off line of permeability vs. tensile strength of TIPS-prepared PVDF membranes. The optimal membrane (M-A30) shows superior performance, such as ultrahigh water flux of 3275 L m −2 h −1 ·bar −1 and tensile strength of 5.7 MPa. Additionally, this research provides a feasible method to regulate the morphology, pore size and permeability of TIPS-prepared PVDF membranes.
研究领域:
材料科学
·
膜技术
·
聚合物工程
✓ 已验证
DOI
高影响因子
SENSORS
·
2021
·Vol. 21
·期 8
·2824
·
IF 3.576
Angelo Coluccia,Alessio Fascista,Arne Schumann,Lars Sommer,Anastasios Dimou,Dimitrios Zarpalas,Miguel Méndez,David de la Iglesia,Iago González,Jean-Philippe Mercier,Guillaume Gagné,Arka Mitra,Shobha Rajashekar
Adopting effective techniques to automatically detect and identify small drones is a very compelling need for a number of different stakeholders in both the public and private sectors. This work presents three different original approaches that competed in a grand challenge on the “Drone vs. Bird” detection problem. The goal is to detect one or more drones appearing at some time point in video sequences where birds and other distractor objects may be also present, together with motion in background or foreground. Algorithms should raise an alarm and provide a position estimate only when a drone is present, while not issuing alarms on birds, nor being confused by the rest of the scene. In particular, three original approaches based on different deep learning strategies are proposed and compared on a real-world dataset provided by a consortium of universities and research centers, under the 2020 edition of the Drone vs. Bird Detection Challenge. Results show that there is a range in difficulty among different test sequences, depending on the size and the shape visibility of the drone in the sequence, while sequences recorded by a moving camera and very distant drones are the most challenging ones. The performance comparison reveals that the different approaches perform somewhat complementary, in terms of correct detection rate, false alarm rate, and average precision.
研究领域:
计算机视觉
·
深度学习
·
监控系统
·
模式识别
✓ 已验证
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2019
·
IF 3.621
Chunyang Bao,Qiang Zhang
PEGylation and glycosylation are utilized in this research as different bioconjugation tools to modify proteins, yielding conjugates with different enzyme activity and assembled structure. Active succinimidyl esters are first synthesized through a facile one-step reaction for the alkyne-functionalization of proteins. Well-defined polymers with controlled MW, narrow dispersity and terminal azide groups, including thermoresponsive poly(PEG) and glycopolymers, are then synthesized via a combination of copper mediated living radical polymerization (Cu(0)-LRP) following azidation reaction. Copper catalyzed azide and alkyne cycloaddition reaction (CuAAC) is finally performed to conjugate poly(PEG) or glycopolymers with the alkyne-functionalized laccase from Trametes versicolor . The coupling of polymers induces further self-assembly of laccase-polymer conjugates into spherical nanoparticles with well dispersion stability and stimuli-responsive behaviours in water. Enzyme activity of the conjugates are also studied, during which the glycosylated laccase has shown relatively higher activity than the PEGylated laccase.
研究领域:
生物化学
·
材料科学
·
分子生物学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）