RSC Advances
·
2017
·Vol. 7
·期 38
·23550-23559
·
IF 3.108
Nanfang Jia,Guofeng Tian,Shengli Qi,Junhao Cheng,Xiaodong Wang,Dezhen Wu
To elucidate the influence of spatial structure on memory behavior, three isomeric polyimides (PIs), PI-3,6-DAPCz-6FDA, PI-3,4′-DAPCz-6FDA, and PI-2′,4′-DAPCz-6FDA, for electrical memory applications are designed and synthesized. Current–voltage characteristics indicate that the three isomeric PIs display vastly deviating memory effects. PI-3,6-DAPCz-6FDA and PI-3,4′-DAPCz-6FDA both show volatile static random access memory (SRAM) behavior, while PI-2′,4′-DAPCz-6FDA exhibits a non-volatile write once read many times (WORM) memory characteristic. The mechanisms associated with the memory effect were analyzed based on molecular simulation results. PI-3,6-DAPCz-6FDA possesses the best structural coplanarity, which greatly facilitates its charge transfer (CT) and back CT process, leading to the volatile SRAM feature. However, PI-2′,4′-DAPCz-6FDA exhibits more torsional structures, which consequently prohibits the back CT process, explaining its non-volatile behavior. Additionally, the three isomeric PIs show fast transient responses. The results show the importance of the spatial structure on polymer memory and the viability of adjusting memory types by isomerization.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
Science of Advanced Materials
·
2019
·Vol. 11
·期 1
·105-111
·
IF 1.158
Di Huang,Long Yanju,Luo Lijun,Li Lingxin,Zhang Sifeng,Wang Lulu,Jiang Fengzhi
N-doped Bi2O3 with hierarchical structure was synthesized using precipitation/calcination method. In this method, ethylenediamine was used as both the nitrogen source and morphology controller besides the P123 triblock copolymer as main structure directing agent,
to control the texture and morphology of the catalyst. The microstructure and chemical composition of N-doped Bi2O3 photocatalyst were characterized with XRD, XPS, SEM-EDS, DR UV-vis, and N2 physisorption. The prepared hierarchical N-doped Bi2O3
was used for the photocatalytic degradation of 17β-estradiol (E2) under visible light. The absorption edge of prepared N doped Bi2O3 appeared an obvious red shift comparing with pure phase Bi2O3. This would help photocatalyst make full
use of light source to degrade E2. Under the same conditions of the photocatalytic reaction, the rate constant of degradation of E2 over N-doped Bi2O3 was 6.3 times of that obtained over Bi2O3. The stability of N-doped Bi2O3
and the mechanism of the photocatalytic degradation of E2 under visible light were studied.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Dandan Guo,Shuxin Yu,Nadeem Muhammad,Shaohua Huang,Yan Zhu
In this work, poly amidoamine grafted composites were proposed as enrichment adsorption materials. The composites were synthesized by grafting poly amidoamine dendrimers onto the surface of poly (styrene–divinylbenzene-glycidylmethacrylate) beads. The number of surface functional groups and adsorption capacities of the composites were controllable by varying the generations of poly amidoamine dendrimers. Afterward, adsorption parameters and desorption eluents were optimized by using N-phosphoryl dipeptide as a target molecular. Under the optimized condition, N-phosphoryl dipeptides in aqueous could be rapidly adsorbed within 30 s, and comparatively high selectivity, enrichment efficiency and recovery efficiency were obtained at pH 3 to 7. The used adsorbents show good reproducibility after being washed by methanol solvent. Reliability of the adsorbents was demonstrated by the determination of N-phosphoryl dipeptide in drinking water samples with the efficient dispersive solid phase extraction-high performance liquid chromatography method. According to the obtained result, the adsorbent showed satisfactory repeatability (RSD ≤ 5.51) and good recoveries (90.52–102.84%).
研究领域:
分析化学
·
生物化学
✓ 已验证
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Fanggang Zhang,Sheng Su,Juan Wang
Aiming to achieve efficient utilization of high-energy–density fuels in the promising portable power systems, self-sustained combustion of n-decane over Co 3 O 4 -based catalysts in a narrow quartz reactor was investigated. Chemiluminescence, gas chromatography and various physicochemical characterization methods were used in this study. The evidences suggest that Co 3 O 4 -based catalysts can significantly reduce the ignition temperature and broaden the flammability limits of n-decane. The heat release stored in the catalyst bed can help improve the flame stability, delay the flame extinction, and achieve auto-ignition without forced heating. Besides, great promotion of the catalytic performance of Co 3 O 4 spinel is achieved by doping with 6 wt% PdO. PdO/Co 3 O 4 catalysts exhibit higher activity and enhanced ability in effectual resistance toward deactivate than pure Co 3 O 4 . Furthermore, the coupling of heterogeneous and homogeneous reactions of n-decane has been analyzed. It can be revealed that both the adsorbed and gaseous OH* radicals play greatly different roles when using different catalysts. These findings promote the use of heavy hydrocarbon fuels for energy supply and contribute to designing efficient Co 3 O 4 -based catalysts rationally.
研究领域:
化学工程
·
催化科学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Yan Zhao,Luyi Yang,Yunxing Zuo,Zhibo Song,Fang Liu,Ke Li,Feng Pan
Employing conductive binders in silicon (Si) anode has been considered as a fundamental solution to the pulverization of Si particles. Therefore, it is still a great challenge to improve the charge transfer capability of the conductive binder. Herein, a copolymer (PFPQ-COONa) is synthesized, characterized, and electrochemically tested as conductive binder for Si anode. It is found that PFPQ-COONa exhibits not only excellent cycling stability, but also satisfactory rate performance with relatively high areal loading, which outperforms currently reported single-component conductive binders. The superior electrochemical performance can be attributed to the molecular-level contact between binder and Si particles and to the enhanced intrinsic conductivity of PFPQ-COONa at reductive potential. This method provides a fresh perspective to design and develop conductive binder for high-capacity battery anode.
研究领域:
材料科学
·
电化学
·
电池技术
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ORGANIC CHEMISTRY
·
2023
·
IF 3.6
Jianyu Dong,Shaofeng Wu,Furong Geng,Yani Yan,Long Liu,Yongbo Zhou
A metal-free and selective oxidative methyl C–H functionalization of BHT with aniline compounds has been developed. This innovative method enables the facile and efficient synthesis of a diverse array of BHT-functionalized N-containing skeletons, including arylamines, benzoxazoles, benzothiazoles, benzimidazoles, quinazolines, and quinazolinones, all of which are challenging to access. The control experiment involving TEMP18O suggests that the radical adduct of TEMPO with the benzyl radical of BHT may serve as an intermediate.
研究领域:
有机化学
·
合成化学
✓ 已验证
DOI
PubMed
高影响因子
Fuel Cells
·
2022
·
IF 2.948
Yanqi Hao,Lin Ge,Siew Hwa Chan
Looking for non-noble metal catalysts with low cost, high activity, and high stability to replace platinum in oxygen reduction reaction (ORR) has aroused great concern. According to previous studies, Fe-N x /C material is one of the most promising non-noble metal catalysts for ORR. In this study, new Fe-N x /C material was synthesized by introducing CeO 2 and Fe 3 O 4 nanoparticles into a Fe-N x /C material derived from ZIF-8 as precursors. The new material was called CeO 2 -Fe 3 O 4 @Fe-N/C catalyst and the activity of the catalyst was found to be significantly improved in 0.1 mol L −1 KOH. The half-wave potential of CeO 2 -Fe 3 O 4 @Fe-N/C (0.892 V) is higher than that of Pt/C by 67 mV. In the stability test, the half-wave potential of CeO 2 -Fe 3 O 4 @Fe-N/C was only reduced by 4 mV after 5,000 cycles. The high performance is attributed to the introduction of CeO 2 and Fe 3 O 4 , which gives CeO 2 -Fe 3 O 4 @Fe-N/C enhanced electrocatalytic activity and long-term stability. This approach makes CeO 2 -Fe 3 O 4 @Fe-N/C a promising candidate for cathode catalysts in renewable energy conversion devices.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
Heliyon
·
2022
·
IF 3.776
Xiang Liu,Yongliang Wang,Li Xiao,Licheng Ma,Peiwei Han,Shufeng Ye
Gold is a valued, critical element whose chemical activation or extraction is challenging. Non-cyanide extraction of gold is now the focus, and N-bromosuccinimide(NBS) is attracting attention. Herein, new insights into the possible mechanism are deeply revealed through comprehensive analysis and detection of the reaction by using elementary gold and gold bearing ore. Experiments on gold foil indicate that Au can be activated in NBS solution to perform a satisfactory dissolution. Application of NBS in gold extraction from ore show a high yield of 86.24% under optimal conditions of NBS dosage 0.05 M, liquid-solid ratio 4:1, stirring speed 400 rpm, pH 8, 25 °C and leaching for 20 h, while yields of other coexisting metals are nearly negligible. The process leads to direct, efficient, one-pot conversion of gold, into simple water-soluble salts. Characterizations show that the framework of NBS are not destroyed, only bromine separates from the framework. The oxidation of neutral gold atom to trivalent Au (III) occurs in a mild, clean and room-temperature chemistry, which converts gold to [AuBr 4 ] - , and the framework to succinimide. The active bromine and radical Br (Br•) generated from in-situ autocatalysis of NBS are responsible for this. The systematic results herald a green procedure for preparation of gold derivatives and gold extraction industry.
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2021
·
IF 3.247
Yangyang Wang,Qiang Ren,Wenhao Zhan,Kaixuan Zheng,Qi Liao,Zhihui Yang,Yansong Wang,Xinling Ruan
A previous isolated Gordonia sp. (Lff) was used to degrade di-n-octyl phthalate (DOP) contamination in both aqueous solution and soil. The influence of temperature, pH, inoculum size, salt content and initial concentration of DOP on DOP degradation by Lff were analysed. The response of soil bacterial community to DOP and Lff was also analysed by Illumina MiSeq sequence method. Results showed that the optimal temperature, pH, inoculum size and salt content were 35oC, 8.0, 5% and <5%, respectively. Under the optimal condition, more than 91.25% of DOP with different initial concentrations (100–2000 mg/L) could be degraded by Lff. Kinetics analysis indicated that biodegradation of DOP by Lff could be described by first-order kinetics (R2 > 0.917) with the half-life (t1/2) changing irregularly between 0.58 and 0.83 d. In addition, Lff enhanced the removal of DOP in soil and alleviated the toxicity of DOP on soil microorganisms. Furthermore, its influence on soil bacterial community is not obvious. These results suggested that Lff was effective in remediating DOP contamination in different environments.
研究领域:
环境科学
·
微生物学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Md Manik Mian,Guijian Liu,Biao Fu,Yu Song
Sewage sludge (SS), the inevitable byproduct of wastewater treatment plants, is facing numerous challenges of environmentally safe and cost-effective disposal. Thus, exploration of efficient SS valorization technique is highly desired. In this study, a sludge derived carbon-supported MnO x as a catalyst (ASMn-Nb) was synthesized through NH 4 OH activation and pyrolysis (800 °C) to enhance peroxymonosulfate (PMS) decomposition and subsequent degradation of acid orange 7 and rhodamine B. The sample characterization indicated that MnCl 2 conditioning produces mixed valent Mn oxides on ASMn-Nb, while NH 4 OH activation significantly enhances N-heteroatoms, surface area, and microporosity. The as-synthesized hybrid catalyst exhibited excellent PMS decomposition ability in a wide range of pH, which enhances AO7 removal efficiency 16%–100% in 40 min compared with that treated with raw sludge biochar. Moreover, the catalyst is recyclable, chemically stable, and produce negligible metal leaching during catalysis. Further investigation of catalytic mechanisms revealed that both radicle and non-radicle processes governing PMS decomposition, whereas mediated electron transfer as the primary and 1 O 2 , SO 4 − , and OH radicals induced catalysis as the secondary mechanisms of PMS activation and subsequent AO7 degradation. Finally, a probable mechanism of PMS decomposition over ASMn-Nb and AO7 degradation path is proposed. This study concurrently provides a facile route of improving the catalytic performance of sludge derived-biochar and a probable SS valorization technique.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Hongtao Wang,Yueyue Li,Chenchang Wang,Yuan Li,Jihao Bai,Yueying liu,Linsheng Zhou,Fengmin Liu,Kengo Shimanoe,Geyu Lu
As one of the most promising “next generation” alcohol fuels, n-pentanol brings convenience to our lives as well as challenges. Realizing real-time monitoring of n-pentanol is important to the health of workers in chemical plants. In this work, a series of Au nanoparticles functionalized ZnO nanorods were prepared by a facile one-step solvothermal method. The electronic sensitization and chemical sensitization of Au nanoparticles regulate the thickness of initial depletion layer of ZnO nanorods and increase the amount of adsorbed oxygen species on the surface. The gas-sensing results showed that 2 mol% Au nanoparticles functionalized ZnO nanorods exhibited the highest response of 71.8 to 4 ppm n-pentanol at 260 °C, and showed much higher response than other various saturated monohydric alcohols with different carbon chain lengths. Moreover, the sensor possessed ultra-fast response speed (1 s), excellent stability, and a certain ability of moisture resistance. The sensor was heated at 350 °C to promote the desorption of n-pentanol. The surface depletion layer model and energy band theory were used to explain the enhanced gas-sensing performance. This work provides a suitable candidate for real-time monitoring of n-pentanol in chemical plants.
研究领域:
材料科学
·
传感器技术
·
纳米材料
·
环境监测
·
职业健康
✓ 已验证
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 8
·1743-1751
·
IF 7.779
Hao Wang,Yuruo Qi,Fangyuan Xiao,Pan Liu,Yi Li,Shu-juan Bao,Maowen Xu
The construction of highly conductive structures with excellent adsorption–catalytic properties to accelerate electron transfer and suppress polysulfide shuttle is considered as an effective strategy to achieve well-performing sodium–sulfur batteries. Herein, a self-supported tessellated N-doped carbon/CoSe2 (NCCS) is developed as a sulfur host for sodium–sulfur batteries by a simple deposition–selenization of lyophilized bacterial cellulose (BC), where NC acts as a conductive network to ensure the rapid initiation of efficient catalytic reactions at the tessellated CoSe2 interface and maintain good structural stability. The CoSe2 nanoparticles provide strong ability in anchoring, trapping and catalyzing polysulfides. As a result, the prepared tessellated NCCS@S cathode demonstrates a high initial discharge specific capacity of 871.3 mA h g−1 at a current rate of 0.1C and good electrochemical stability for up to 500 cycles at 1C.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）