MICROPOROUS AND MESOPOROUS MATERIALS
·
2016
·
IF 3.349
Chen Liu,Lu Bai,Jianming Zhang,Deng Hu,Meng Li,Gaofeng Zeng,Yanfeng Zhang,Wei Wei,Yuhan Sun
Rapid synthesis and characterization of all-silica Deca-Dodecasil 3 Rhombohedral (DD3R) zeolite were systematically studied with (NH 4 ) 2 SiF 6 as silica source. The effects of gel recipe, synthesis temperature and time, seeding, aging and silica source were investigated systematically. Big DD3R crystals (50–150 μm) with various morphologies (hexagonal plate, polyhedron and rhombohedron) were obtained by tuning the synthesis temperature, time, seeding and aging. Compared with other silica sources, (NH 4 ) 2 SiF 6 is very reactive which enhances the nucleation and crystal growth of DD3R zeolite significantly. At 220 °C, highly crystalline DD3R was obtained in 12 h without seeding, which is the fastest synthesis up to now. Aging and seeding reduced the synthesis time substantially and led to smaller crystals. With the help of seeding and aging, pure DD3R crystals were obtained in 6 d at 100 °C, which opens the door to synthesis at low temperature and ambient pressure. Mixed silica sources can reduce the consumption of expensive (NH 4 ) 2 SiF 6 . Higher calcination temperature is required for the complete template removal of the big DD3R crystals obtained in this study, which hinders the diffusion of oxidation products from the template. Zeolites SGT and DOH are competing phases in the synthesis of DD3R. The introduction of Al into the mother liquor led to the formation of zeolite SGT.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Junsen Zhong,Bingkun Huang,Jianxin Song,Xiaolong Zhang,Lingyu Du,Yanfeng Gao,Wei Liu,Litao Kang
As the best-known and extensively-studied electrochromic material, tungsten trioxide (WO 3 ) has drawn tremendous interest due to its low material cost, environmental benignity, dual band regulation, high optical modulation, and high chemical stability. However, these films always suffer from ion-trapping-induced degradation in electrochromic performance when cycled in alkali cation (such as Li + , Na + , K + , etc.) electrolytes. Herein, we report a stable WO 3 electrochromic system enabled by a NH 4 CF 3 SO 3 -TEP (Triethyl phosphate) organic electrolyte. Based on comparative experiments and systematic characterizations, the prolonged cycling stability is mainly attributed to the formation of hydrogen bonds between the NH 4 + ions and the WO 3 lattice, which are much weaker than metallic coordination bonds. Furthermore, the bulky CF 3 SO 3 − anion and large TEP solvent molecule are also favorable to stabilize WO 3 , since they are more resistive to be co-inserted into the WO 3 lattice along with the shuttling NH 4 + cations. Thanks to these merits, this NH 4 CF 3 SO 3 -TEP electrolyte simultaneously enables great electrochromic activity (76.1 % transmittance modulating ability at 633 nm) and impressive cyclic color-switching stability (1000 times color change without any detectable electrochromic performance or mechanical degradation), overwhelmingly outperforming the conventional Li + /K + electrolytes. Furthermore, as a demonstration of its application, a WO 3 /Zn electrochromic device is fabricated based on a NH 4 + /Zn 2+ -CF 3 SO 3 dual-cation TEP electrolyte. These findings may shed light on the in-depth understanding of WO 3 ′s “ion trapping” effect, as well as the electrolyte design of high-performance WO 3 -based electrochromic devices.
研究领域:
材料科学
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电化学
·
光电
✓ 已验证
产品关联
DOI
高影响因子
ANALYST
·
2021
·Vol. 146
·期 22
·6883-6892
·
IF 4.616
Jing Chen,Fanghong Xu,Qian Zhang,Shuying Li,Xiaoquan Lu
A fluorescent probe based on single metal–organic framework material without additional fluorophores and active sites can significantly improve the stability of the probe for detection, and has very important application value in environmental analysis and detection. In this paper, a simple and rapid fluorescence detection method was established with Zn-MOF, which realized the highly sensitive detection of tetracycline antibiotics and NH4+ in water. The prepared Zn-MOF has abundant pores and can exist stably in water. When tetracycline antibiotics are present in Zn-MOF aqueous solution, based on the unique coordination ability between Zn and N, tetracycline antibiotics rich in N will be adsorbed into the pore canals of MOF, and aggregation-induced luminescence will occur. The original non-fluorescent Zn-MOF will immediately produce yellow fluorescence, realizing the detection of tetracycline antibiotics in water, with the limit of detection reaching 0.017 μM in a linear range of 0.02–13 μM. Zn-MOF is further used for the detection of tetracycline antibiotics in actual samples of milk and honey. Oxytetracycline (OTC) with the best fluorescence response of tetracycline antibiotics was coated on Zn-MOF to synthesize OTC@Zn-MOF fluorescent probe. NH4+ will replace the original ligand of Zn-MOF, which will disintegrate MOF and release OTC, resulting in a fluorescence decrease. Therefore, NH4+ can be detected with low limit of detection (0.038 μM) in a linear range of 0 to 3 mM. The probe is expected to be able to detect ammonia in the environment.
研究领域:
环境分析
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化学传感
·
药物检测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Yan Wu,Tao Liu,Bin Ji,Wei Wang
Iron-cobalt alloy is a potential and economical magnetostrictive material, however, our microscopic understanding of the co-electrodeposition process of Fe-Co alloys is still unsatisfactory. In this work, a flat Fe-Co film with 10 μm was successfully prepared by electrodeposition with a non-toxic sulfate solution. The effects of (NH 4 ) 2 SO 4 , an important additive, were studied and DFT calculation was used to analyze the mechanism of (NH 4 ) 2 SO 4 . EIS shows that (NH 4 ) 2 SO 4 can promote the Fe-Co co-deposition process and obviously inhibits the hydrogen evolution reaction. In addition, (NH 4 ) 2 SO 4 can significantly reduce the internal stress of the Fe-Co film by 110,000 MPa, so that the cracks caused by the internal stress are obviously removed. The results of quantum chemistry calculation further show that NH 4 + is more inclined to adsorb on Fe-Co surface than H 2 O and H + , which reduces the hydrogen evolution on the electrode surface. The results are beneficial to improve the Fe-Co co-deposition process, reduce the internal stress and to prepare a high-performance Fe-Co magnetic film. The films will be assembled on the electronic devices with sensors.
研究领域:
材料科学
·
电化学
·
表面化学
·
量子化学
✓ 已验证
产品关联
DOI
高影响因子
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
·
2020
·Vol. 46
·期 1
·485-494
·
IF 1.711
Wang Han,Huang Wuji,Huang Shiyi,Xia Ling,Liu Xinyue,Li Yinta,Song Shaoxian,Yang Lang
Extracellular polymeric substances (EPS) occur naturally and widely on the surface of microbial cells; their reducibility may play a crucial role in graphene oxide reduction. In this work, the conversion of graphene oxide (GO) into reduction graphene oxide (rGO) with EPS (extracted from Bacillus sp.NT 10 ) as green reductant had been conducted to explore their potential application for graphene preparation. The results showed the GO could be reduced by EPS, especially in the presence of NH 4 + , and a synergetic effect was found between EPS and NH 4 + . Further studies hinted the rGO could be also obtained from GO by EPS reduction even under a mild alkaline condition (pH = 8), lightly higher room temperature (40 °C) and a certain amount of time (24 h). The good reduction performance was found to be ascribed to the real deoxygenation of oxygenous functional groups and restoration of electronic conjugation within GO, according to the analysis of XRD, XPS and FT-IR as well as Raman spectra, while the electron-rich tryptophan-like protein and aromatic protein on the surface of EPS as well as the assistance of NH 4 + should account for the deoxygenation and restoration in terms of the detection on Zeta potential, AFM and 3D-EEM. These findings revealed the reduction of GO with EPS would be a green, environment-friendly and promising path to obtain rGO, which may open a novel route for the preparing graphene alternatively.
研究领域:
材料科学
·
微生物学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-11
·
IF 15.7
Tong Bo,Xu Jiajun,Du Jinhong,Liu Peitao,Du Tianming,Wang Qiang,Li Langjun,Wei Yuning,Li Jiangxu,Liang Jinhua,Liu Chi,Liu Zhibo,Li Chen,Ma Lai-Peng,Chai Yang,Ren Wencai
Machine learning is the core of artificial intelligence. Using optical signals for training and converting them into electrical signals for inference, combines the strengths of both, and thus can greatly improve machine learning efficiency. Optoelectronic memories are the hardware foundation for this strategy. However, the existing optoelectronic memories cannot modulate a large number of non-volatile resistive states using ultra-short and ultra-dim light pulses, leading to low training accuracy, slow computing speed and high energy consumption. Here, we synthesized a van der Waals layered photoconductive material, (NH 4 )BiI 3 , with excellent photoconductivity and strong dielectric screening effect. We further employed it as the photosensitive control gate in a floating-gate transistor, replacing the commonly used metal control gate, to construct an optical floating gate transistor which achieves adjustable synaptic weights under ultra-dim light without gate voltage assistance. Moreover, it shows ultra-low training energy consumption to generate a non-volatile state and the largest resistive state numbers among the known non-volatile optoelectronic memories. These exceptional performances enable the construction of one-transistor-one-memory device arrays to achieve ~99% accuracy in Artificial Neural Networks. Moreover, the device arrays can match the performance of GPU in YOLOv8 while greatly reducing energy consumption.
研究领域:
材料科学
·
人工智能
·
电子工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Yongheng Xiong,Qin Zhong,Man Ou,Wei Cai,Shipeng Wan,Yang Yu,Shule Zhang
The discovery of effective methods toward nitric oxide (NO) removal by solution is valuable for the cost-effective flue gas control. In this study, it is first reported that nitrous oxide (N2O) is obviously suppressed by using copper oxide (CuO) combined with (NH4)2SO3 (NS) solution. CuO has been characterized, and the effects of reactants concentration, additives, temperature, pH and powder size on NO absorption process have been evaluated. The selectivity of N2O can drop from 91.30% to 11.25% under the optimum experimental conditions. Furthermore, based on the method of single-factor analysis, the inhibition of N2O is identified as the coeffect of NS/CuO. In addition, the pathways of NO removal are divided into two parts—N2O formation and NO absorption—and its ratio is calculated in the range of 0.29–0.53. Because of the continuous supply of NS from ammonia desulfurization, this study opens the feasibility of simultaneous desulfurization and denitrification.
研究领域:
环境科学
·
化学工程
·
大气污染控制
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Yanzhou Bao,Jiabao Yan,Jie Hu,Jing Li
Potential stability and reproducibility of solid-contact ion-selective electrodes (SC-ISEs) are key to ensure reliable accuracy of actual water sample monitoring. However, undesirable water layer formed at interface of SCs and ion-selective membranes inevitably changes the interfacial potential. Here a superhydrophobic polyaniline (PANI) SC is presented to improve potential response of NH 4 + -ISE. Electrodeposition methods are used to control PANI growth and perfluorooctanoic acid co-doping, forming PANI SCs with different wettabilities. Though constructed SC-NH 4 + -ISEs show detection linear ranges from 10 -5 to 10 -1 M, superhydrophobic SC-ISE has a slope (58.07 mV/dec) closest to the ideal Nernstian slope. Importantly, superhydrophobic SC greatly inhibits water layer formation and enables SC-NH 4 + -ISE to have a very stable potential response. Potential drift is only 13.6 ± 3.2 µV/h for 12 h continuous measurement and standard deviation of the standard potential is 0.96 mV (n = 3), which are 55.7 and 5.4 times lower than those of unmodified SC-ISE, respectively. Moreover, superhydrophobic SC-ISE exhibits excellent potential stability against external interferences and even during actual wastewater monitoring. Once water layer is formed in unmodified SC-ISE, inaccuracy of measured NH 4 + concentrations in actual wastewater reaches ca. 37%. This study demonstrates that superhydrophobic SC can efficiently improve potential response of SC-ISEs.
研究领域:
分析化学
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材料科学
·
环境监测
✓ 已验证
产品关联
DOI
高影响因子
National Science Review
·
2022
·Vol. 9
·期 8
·
IF 23.178
Cheng Bingliang,Li Zijian,Chu Yu,Tudi Abudukadi,Mutailipu Miriding,Zhang Fangfang,Yang Zhihua,Pan Shilie
Deep-ultraviolet (DUV) nonlinear optical (NLO) crystals that can extend the output range of coherent light below 200 nm are pivotal materials for solid-state lasers. To date, KBe2BO3F2 (KBBF) is the only usable crystal that can generate DUV coherent light by direct second harmonic generation (SHG), but the layered growth habit and toxic ingredients limit its application. Herein, we report a new fluoroborophosphate, (NH4)3B11PO19F3 (ABPF), containing four different functional units: [BO3], [BO4], [BO3F] and [PO4]. ABPF exhibits a KBBF-like structure while eliminating the limitations of KBBF crystal. The unique [B5PO10F]∞ layers enhance ABPF’s performance; for example, it has a large SHG response (1.2 × KDP) and a sufficient birefringence (0.088 at 1064 nm) that enables the shortest phase-matching wavelength to reach the DUV region. Meanwhile, the introduction of strong B-O-P covalent bonds decreases the layered growth habit. These findings will enrich the structural chemistry of fluoroborophosphate and contribute to the discovery of more excellent DUV NLO crystals.
研究领域:
材料科学
·
晶体化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2016
·
IF 2.758
Yining Ma,Huaijuan Zhou,Jingting Zhu,Shidong Ji,Shanhu Bao,Rong Li,Ping Jin
Flake-like VO 2 (M) has been successfully synthesized by annealing plate-like (NH 4 ) 0.6 V 2 O 5 in vacuum and its thermochromicity was investigated. Preparation conditions such as temperature and vacuum degree have been varied to obtain the pure phase. The formation mechanism from ammonium vanadium bronze to VO 2 (M) has been explored. The flake-like VO 2 (M) shows an excellent thermochromicity; the infrared modulation at 2500 nm was up to 56.6% with a 30% visible transmittance which will be beneficial for smart windows, smart curtains or other applications.
研究领域:
材料科学
·
热致变色材料
·
纳米材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2013
·
IF 2.297
Qiu-Yue Kang,Qing Song,Sa-Ying Li,Zhi-Hong Liu
Two pure borophosphates microporous materials, K[ZnBP 2 O 8 ] and NH 4 [ZnBP 2 O 8 ], have been synthesized and characterized by XRD, FT-IR, DTA-TG techniques and chemical analysis. The molar enthalpies of solution of K[ZnBP 2 O 8 ](s) and NH 4 [ZnBP 2 O 8 ](s) in 3 mol · dm −3 HCl(aq), of KCl/NH 4 Cl(s) in (HCl + H 3 BO 3 )(aq), and of Zn(PO 3 ) 2 (s) in (HCl + H 3 BO 3 + KCl/NH 4 Cl)(aq) were measured by microcalorimeter at T = 298.15 K, respectively. With the incorporation of the previously determined enthalpy of solution of H 3 BO 3 (s) in 3 mol · dm −3 HCl(aq), together with the use of the standard molar enthalpies of formation for Zn(PO 3 ) 2 (s), KCl(s), NH 4 Cl(s), H 3 BO 3 (s) and H 2 O(l), the standard molar enthalpies of formation of −(3184.0 ± 1.2) kJ · mol −1 for K[ZnBP 2 O 8 ] and −(3067.6 ± 1.2) kJ · mol −1 for NH 4 [ZnBP 2 O 8 ] at T = 298.15 K was obtained on the basis of the appropriate thermochemical cycles.
研究领域:
无机化学
·
物理化学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2025
·
IF 3.2
Wei Zeng,Sili luo,Da Rong,Yanlong Li,Yunying Fei,Meng Zhao,Linsheng Huang
A highly sensitive electrochemical sensor based on a composite of two-dimensional (2D) reduced graphene oxide (rGO) and three-dimensional (3D) zeolitic imidazolate framework-8 (ZIF-8) for detecting the NH4+ ion is reported. The ZIF-8/rGO composite electrode is in situ grown to be anchored on the Si/Ag substrate. Here, the rGO layer has high conductivity, while ZIF-8 has a large specific surface area, which provides a large number of active sites. This structure significantly increases the electrical conductivity and enhances the electrochemical performance. With a differential pulse voltammetry measurement at the pH value of 7.00, the multidimensional composite electrode with the optimal ZIF-8 structure exhibits a sensitivity of 9.30 μA μM–1, and a detection range of 5–50 μM with a low detection limit of 3.00 × 10–9 M, as well as high repeatability, stability, and selectivity. These results might be due to the oxidation reaction of NH4+ with the ZIF-8 framework and the special 2D–3D electron transfer channel formed by the composite.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）