Sustainability
·
2023
·Vol. 15
·期 3
·2751
·
IF 3.9
Jiaqi Wu,Wenbo Li,Wenting Xu,Lin Yuan
There is a growing global trend to encourage citizen participation in solving urban problems, and there is worldwide consensus that the public voice needs to be considered. This study uses an extended Theory of Planned Behavior (TPB) to focus on the factors influencing resident engagement following changes in renewal strategies in older residential communities in China. Empirical analysis was carried out based on structural equation modeling (SEM) of a completed questionnaire with 865 respondents. The results showed that Neighborhood Relations (NR) had a positive impact on Participation Attitude (PA); both PA and Awareness Participation (AP) had a positive effect on Self-evaluation (SE), and SE and AP had a positive impact on Participation Guarantee (PG). A survey was also conducted on residents’ concerns and perceptions of the redevelopment of the old neighborhood, analyzing the current issues of residents’ more significant concerns. It showed that public emergencies can affect residents’ inherent perceptions. This study enriches the China-specific focus of the issue and is a reference for similar studies in the future.
研究领域:
城市规划
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公共政策
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环境心理学
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城市发展中社会行为
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Journal of Energy Chemistry
·
2026
·
IF 15.6
Lu Lin,Ziwei Tong,Zhiqing Xue,Tong Qiu,Yong Chen,Zhongchao Bai,Shixue Dou,Nana Wang,Xiaoqi Sun,Guoxiu Wang
Organic small molecules are promising cathode materials for aqueous zinc batteries due to their structural tunability and sustainability. However, their intrinsically poor electrical and ionic conductivities seriously hinder the rate capability. To compensate, organic electrode preparation usually requires the addition of a large amount of carbon agents, typically ≥30%, which adds processing complexity and limits the practical energy density of the system. To address these very important limitations, we design and synthesize a fully conjugated quinone molecule, tri-(pyrene-4,5,9,10-tetraone)-di-(tetraamino-p-benzoquinone) (TPDT), featuring multiple redox-active sites with unique dynamic tautomerization. Experimental and theoretical analyses reveal that TPDT possesses extended π-conjugation, cationic radical stabilization, and π-π stacking interactions, which together promote efficient through-plan and through-space charge transport. Remarkably, the partially reduced TPDT isomers with different C=O or C=N reaction sites exhibit low energy differences, enabling dynamic tautomerization at room temperature. This equilibrium facilitates charge redistribution and continuous charge-transfer pathways across the molecular framework. As a result, TPDT exhibits excellent electrical and ionic conductivities and outstanding electrochemical performance. The composite with graphene oxide further ensures stable cycling. With only 5% Ketjen black (KB) additive, the composite cathode delivers a high capacity of 313 mAh g −1 at 0.1 A g −1 and retains 81 mAh g −1 at 50 A g −1 together with 92% capacity retention after 20,000 cycles. At the low temperature of −20 °C, it still maintains 128 mAh g −1 at 5 A g −1 over 5400 cycles. This work highlights the importance of structural dynamics in designing organic cathodes and has a guiding significance for developing high-performance zinc-organic batteries.
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Journal of Materials Chemistry A
·
2026
·
IF 9.2
Xiaodong Wu,Weiye Zhang,Jie Sun,Jiarui Xue,Jiyuan Zhang,Ruibin Jiang,Xuexia He,Qi Li,zhibin lei,Zonghuai Liu
The development of lithium sulfur (Li-S) battery is considerably limited due to the "shuttle effect" of the soluble lithium polysulfides (LiPSs). The introduction of modified separator at the cathode side is proved to be one of the effective solutions. In this work, TiO nanoflakes (TiO-NFs) with (001) exposed facets were successfully prepared to block the shuttle of LiPSs and improve the redox kinetics at the same time. The employment of the polydopamine (PDA) was confirmed to be helpful on inhibiting the morphology change of TiO-NFs during magnesiothermic reduction reaction process. Through visible adsorption, symmetric cells and Li2S nucleation testing, the TiO-NFs is confirmed to possess excellent adsorption and catalytic activity on LiPSs. The assembled batteries by using TiO-NFs@PP modified separator exhibit the initial capacity of 1492 mAh g -1 at 0.1 C. When the current density reached 1 C, the capacity decay per cycle revealed as low as 0.067% after 1000 cycles. Even under the high sulfur loading of 5.5 mg cm -2 , a high areal capacity of 4 mAh cm -2 can be maintained after 100 cycles at 0.2 C. This work provided new methods for the design and preparation of non-stoichiometric metal oxides with specific exposed facets toward high-performance Li-S batteries.
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PROCESS BIOCHEMISTRY
·
2026
·
IF 4.4
Hongjian Xue,Jingwen Zhou,Guocheng Du,Song Liu
Phospholipase A1 (PLA1) selectively hydrolyzes the sn-1 ester of phospholipids and is ideal for enzymatic oil degumming. To efficiently produce PLA1, this study heterologously expressed the saPLA1 gene from Streptomyces albidoflavus NA297 in the genome-reduced strain Streptomyces mobaraensis smYS1-Δ tg , and analyzed the enzymatic properties and degumming performance of the recombinant enzyme. Results showed that under the control of the strong promoter P gapdh and the transglutaminase (TGase) signal peptide, secretory activity peaked at 39.4 U/mL within 48 h. It exhibited optimal activity at 50°C and pH 6.0, with good stability over pH 5–8. Additionally, saPLA1 was significantly activated by Mn 2 + , Fe 2+ and citrate, and functioned in a Ca 2+ -independent manner. Under optimized process conditions, saPLA1 reduced the phosphorus content in crude soybean oil from 113.01 to 7.27 mg/kg within 2.5 h, meeting the physical refining requirement. This study provides a novel strategy for the industrial production and application of food-grade saPLA1.
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CERAMICS INTERNATIONAL
·
2022
·Vol. 48
·期 8
·11869-11871
·
IF 5.532
Xueyin Liu,Kezhuo Li,Ke Bao,Junfeng Chen,Haijun Zhang,Shaowei Zhang
Phase pure MgAl 2 O 4 –ZrB 2 composite powder was successfully synthesized at 1200 °C for 4 h from ZrO 2 , B 2 O 3 , and Al, in molten MgCl 2 which acted as not only an Mg-bearing reactant but also a liquid reaction medium. Mediated by such a liquid medium, Al initially reduced B 2 O 3 , forming B and Al 2 O 3 which further reacted with ZrO 2 and MgCl 2 , forming ZrB 2 and MgAl 2 O 4 , respectively. As prepared powder comprised angular MgAl 2 O 4 grains with sizes from ∼100 nm to ∼2 μm, and ZrB 2 particles of ∼100 nm in average. The molten salt synthesis strategy demonstrated here is believed to be universally applicable to preparations of a range of MgAl 2 O 4 -boride composite powders for future in-depth exploration.
研究领域:
材料科学
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陶瓷
·
无机合成
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复合材料
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高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Zheng Ma,Jingdan Lei,De Zhang,Chao Wang,Jianli Wang,Zhenxiang Cheng,Yuanxu Wang
SnTe has attracted more and more attention due to the similar band and crystal structure with high performance thermoelectric materials PbTe. Here, we introduced Pd into SnTe and the valence band convergence was confirmed by first-principles calculation. In the experimental process, we found that Pd-doped SnTe exhibit a reduced thermal conductivity because of softening chemical bonds and grain refining effects. To further improve the thermoelectric performance, Pd–In codoped SnTe samples were prepared, and the abnormal change of thermal conductivity was observed. The results of synchrotron powder diffraction suggest that the local phase transition (local structural distortions) near 400 K results in the first turn on thermal conductivity. Similarly, the second local phase transition in near 600 K observed by neutron powder diffraction lead to a decrease thermal conductivity of the sample. Finally, a peak thermoelectric figure of merit (ZT) ≈ 1.51 has been obtained in Sn0.98Pd0.025In0.025Te at 800 K.
研究领域:
材料科学
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热电学
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固态物理
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晶体学
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Chemical Engineering and Processing-Process Intensification
·
2015
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IF 2.071
Taotao Fu,Lijuan Wei,Chunying Zhu,Youguang Ma
This paper presents an experimental investigation on the flow patterns of Newtonian/non-Newtonian fluids two-phase flow in T-shaped rectangular microchannels by using a high-speed camera. Three different dimensions of microchannels are employed with 400 μm × 400 μm, 400 μm × 600 μm, 400 μm × 800 μm in depth and width, respectively. The cyclohexane is used as the dispersed phase , and various concentrations of carboxyl methyl cellulose (CMC) aqueous solutions as the continuous phase. Results show that slug flow, droplet flow, parallel flow and jet flow are the main flow patterns for cyclohexane-CMC two-phase flow in rectangular microchannels . The larger the concentration of CMC solutions and the smaller the size of the microchannels are, the wider of the regimes are for the droplet flow and parallel flow. A model is proposed to predict the transitions between adjacent flow regimes for liquid–liquid two-phase flow in non-Newtonian fluids in rectangular microchannels.
研究领域:
微流控
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多相流
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非牛顿流体力学
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化学工程
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yi Zhang,Da Luo,Yin Zhang,Qi-Hai Zhang,Qing-Yuan Ji,Shi-Kang Zhou,Shan Huang,Li-li Li,Feng Lu,Wei-Feng Yao,Fang-Fang Cheng,Jun-Jie Zhu,Li Zhang
Upconversion nanoparticles (UCNPs) are promising materials for imaging biomolecules and predicting the progression of diseases, especially for tumors. However, conventional luminescence resonance energy transfer (LRET) based nanosensors remain challenging with complicated modification and unsatisfactory sensitivity. Herein, a sensing platform integrating confined emission effect and cycling amplification strategy into one substrate with high LRET efficiency and sensitivity has been developed for the in - vitro and in - vivo detection of microRNA-21. Washing UCNPs with hydrochloric acid was conducted for electrostatic absorption of 8–17 DNAzyme labeled with BHQ1 (8–17 DNAzyme-BHQ1) and complementary capturing template-aDNA3 complex (CPT-aDNA3) to form energy donor–acceptor pair (UCNPs-BHQ1) and capture miR-21. It not only avoids the complex modification procedure but also shortens the distance between the donor (UCNPs) and the acceptor (BHQ1). The quenching efficiency of 60.94 % was obtained. Targeted miR-21 could bind with CPT to release aDNA3 that can unlock 8–17 DNAzyme-BHQ1 to form aDNA3-DNAzyme-BHQ1 duplex. This aDNA3-DNAzyme-BHQ1 duplex owning -rA- group can be cleaved by Zn 2+ so that UCNPs restored green UCL emission because of the desorption of BHQ1. aDNA3 becomes dissociative again to trigger the next cycle. This [email protected] /CPT- aDNA3 achieved a wide linear range from 4 × 10 -14 M to 1 × 10 -8 M with a low limit detection of 31 fM for the sensitive detection of miR-21 in vitro . Furthermore, it was successfully applied to the real-time intracellular detection of miR-21 in HeLa cells and in - vivo monitoring of miR-21 expression in KS-01 treated tumor-bearing mouse. This proposed DNA-conjugated upconversion nanoamplicon provides new sights into monitoring of anti-cancer active ingredients efficacy and the progress evaluation of miRNA-related diseases.
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Materials Today Communications
·
2023
·
IF 3.8
Yusheng Yang,Bai Sun,Guangdong Zhou,Chuan Ke,Jie Zhang,Yongzan Zhou,Shuangsuo Mao,Jiajia Qin,Yong Zhao
Since memristors have shown great application prospects in non-volatile memory, neural synapse, brain-like chips, artificial intelligence (AI) and quantum computers, the research of memristors has received extensive attention. In this work, the resistive switching (RS) device with Ag/SrTiO 3 (STO)/Ti structure was fabricated, and it can significantly improve the RS performance of device by doping Mn ions into STO to replace part of Ti ions . That is to say, the Ag/Mn-doped SrTiO 3 (SMTO)/Ti device exhibits larger resistance window and better retention at room temperature. Finally, through in-depth mechanistic analysis, a physical model of the conducting filament and Schottky emission was established to understand the charge transport mechanism and RS behavior of the device. In particular, it provides favorable factors for the migration of ions and electrons through the Mn doping because the substitution of Mn for Ti ions reduces the volume of the STO crystal while distorting its crystal shape since the ionic radius of Mn is smaller than that of Ti. This work provides an important way to improve the RS properties of ABO 3 -type perovskite-based resistive random access memory (RRAM), and helps to explore the cutting-edge applications of high-performance RS devices in information processing and AI.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2022
·
IF 10.753
Jiayi Xu,Hanpei Yang,Jun Hou,Lingzhan Miao,Jun Wu
Ferrihydrite (Fh) often coexists with organic matter (i.e., humic acid (HA)) in the environment; however, its impacts on the transformation of hexavalent chromium (Cr(VI)) is poorly understood during the sulfidation of Fh. Upon exposed to 2 mM sulfide for 12 h, the total amount of Fe(II) (Fe( II ) tot , 0.78 mM) in treatments with HA (300 mg HA/L) was higher than that (0.67 mM) in treatments without HA, since HA could enhance the solubility of Fe(II). After then, the Cr(VI) was reduced by sulfidated Fh. Aqueous Cr(VI) concentration (Cr( VI ) aq ) declined from 0.67 to 0.43 mM with the increase of HA concentration from 0 to 400 mg/L, which was partly ascribed to the inhibition of surface passivation by HA. Moreover, the increase in Fe(II) during the sulfidation of Fh also exerted a strong impact on the transformation of Cr(VI) subsequently. In addition of HA, batch experiments suggested that EDTA could also promote the formation of Fe(II) (Fe( II ) tot , 0.80 mM), rendering a lower Cr( VI ) aq (0.59 mM) in EDTA-300 treatments. This study further demonstrated that HA played an important role in the transformation of Cr(VI), hence providing a theoretical basis for in-situ remediation of Cr(VI) in the future.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Jie Zhou,Hao Liu,Chao Xiong,Peng Hu,Hao Wang,Xuyu Wang,Hongbing Ji
Propane dehydrogenation (PDH) has been a promising method to satisfy the increasing demand for propylene, but Pt-based catalysts always suffer from sintering and coke formation. Developing stable and efficient catalysts for PDH is of great significance for the industry. Herein, the paper reports that a catalyst with potassium-promoted Pt-In bimetallic clusters encapsulated in silicalite-1 (S-1) zeolite works as an efficient and stable catalyst for PDH. The catalyst achieves a propane conversion of 43.73 % with 97.14 % selectivity of propene and an extremely high propylene productivity of 20.33 mol g Pt -1 h -1 with a weight hourly space velocity (WHSV) of 6.75 h −1 . No obvious deactivation occurs after 48 h on stream, affording an extremely low deactivation constant of 0.0025 h −1 . The introduction of indium species greatly improves the propene selectivity and restricts the coke formation. The introduction of K + into S-1 can significantly enhance the catalytic activity and the stability of the catalyst. The catalyst with excellent activity and stability is potential for industrial application.
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Nutrients
·
2022
·Vol. 14
·期 20
·4413
·
IF 6.706
Hanlei Wang,Kun Zhang,Xuelin Chen,Mei Han,Jing Lu,Yumei Zhang
In folk medicine,Ficus tikoua(F. tikoua) has been used to treat diabetes for a long time, but there is a rare modern pharmacological investigation for its antidiabetic effect and mechanisms. Our study aimed to evaluate its hypoglycemic effect using in vitro and in vivo experimental models and then explore the possible mechanisms. In the ethanol extracts and fractions ofF. tikoua, n-butanol fraction (NBF) exhibited the most potent effect on inhibitingα-glucosidase activity (IC50= 0.89 ± 0.04 μg/mL) and promoting glucose uptake in 3T3-L1 adipocytes. Further animal experiments showed that NBF could play an antidiabetic role by ameliorating random blood glucose, fasting blood glucose, oral glucose tolerance, HbA1c level, and islets damage in diabetic mice. Then, the activities of the five subfractions of NBF (NBF1-NBF5) were further evaluated; NBF2 showed strongerα-glucosidase inhibition activities (IC50= 0.32 ± 0.05 μg/mL) than NBF. Moreover, NBF2 also possessed the ability to promote glucose uptake, which was mediated via P13K/AKT and AMPK pathways. This study demonstrated thatF. tikouapossesses antidiabetic efficacy in vitro and in vivo and provided a scientific basis for its folk medicinal use. NBF2 might be potential natural candidate drugs to treat diabetes mellitus. It is the first time the antidiabetic activity and the potential mechanisms of NBF2 were reported.Keywords:Ficus tikouaBur.;diabetes mellitus;α-glucosidase;3T3-L1 adipocytes;db/dbmice
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高影响因子
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