JOURNAL OF MOLECULAR STRUCTURE
·
2022
·
IF 3.841
Zhengjun Cheng,Yucong Fan,Lei Zhang,Chen Wang
A water-soluble, stable, simple, and dual ligands (bovine serum albumin and lysozyme) and Ag doping co-enhanced Au nanoclusters (Lys/BSA-Ag/AuNCs) was synthesized by one-step wet chemical synthesis. The introduction of Lys-and Ag could improve significantly the quantum yields of AuNCs (QYs, 2.54% to 12.73%). A new ratio fluorescent probe (RF-probe) was successfully obtained for sensitively and selectively mensurating 4-hexylresorcinol (4-HR) and Cr 6+ . That is, the fluorescence (FL) intensity of nanoclusters at 610 nm was used as the built-in reference, while dopamine (DA) reacting with 4-HR could produce a new fluorescent substance, and its FL intensities at 490 nm were enhanced gradually with increasing the concentrations of 4-HR. On the other hand, Cr 6+ will react with DA and consume the amount of DA reacting with 4-HR, resulting in the weakening of FL intensity at 490 nm, so the ratiometric fluorescence detection of Cr 6+ was also realized. The contents of 4-HR and Cr 6+ could be monitored by the RF-probe with linear ranges of 1.0–140.0 and 3.0–110.0 nM, and corresponding values of LOD (limit of detection) were calculated to be 0.16 and 0.37 nM (3σ/slope). Moreover, the proposed method was extended to the detections 4-HR and Cr 6+ in practical samples, and the results were consistent with those of the standard HPLC and UV–vis spectrophotometric methods. In addition, Lys/BSA-Ag/AuNCs exhibited an excellent temperature sensing performance in the range of 10.0–64.0 ℃.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energetic Materials
·
2023
·
IF 2.1
Hua Fang,Xueyong Guo,Liping Shi,Kehua Han,Jianxin Nie,Shuji Wang,Chengcheng Wu,Peng Deng
In order to promote the development of molecular perovskite energetic materials, studying thermal decomposition performances of AP-based molecular perovskite energetic materials ((H2dabco)[NH4(ClO4)3], DAP-4) catalyzed by metal hydrogen storage fuel is significant. In this study, the morphology, structure and thermal decomposition characteristics of TiH2, DAP-4 and DAP-4/TiH2 composite materials were characterized and investigated. The experimental results showed that the DAP-4 peak exothermic temperature at different heating rates both showed a decreasing trend with TiH2 content increased. With 20 wt% TiH2 added, the DAP-4 peak exothermic temperature decreased from 394.3 ℃ to 352.8 ℃ (10 ℃/min heating rate), and the apparent activation energy (Ea) also decreased from 201.5 KJ/mol to 182.3 KJ/mol. A possible catalytic thermal decomposition mechanism of perovskite catalyzed by TiH2 was proposed. This work is helpful to further understand the thermal decomposition characteristics of molecular perovskite energetic materials in the presence of metal hydrides.
✓ 已验证
产品关联
DOI
高影响因子
Defence Technology
·
2022
·
IF 4.035
Peng Deng,Xue-yong Guo,Hua Fang,Rui Liu,Peng-wan Chen
Combined with the oxidizer anions and fuel cations, molecular perovskite energetic materials show a good potential. In this work, the combustion behavior and mechanism of metal fuel aluminium (Al) with molecular perovskite energetic material (H 2 dabco)[NH 4 (ClO 4 ) 3 ] (DAP-4) as a high-energy oxidant was investigated. The DAP-4 based composites with metal fuel Al were designed and fabricated by the different mass ratios. Results showed that DAP-4 exhibits a good oxygen-supplied capacity for enhancing the combustion performance of Al. The maximum combustion heat of DAP-4/Al-3 at the Al/O mass ratio of 38:62 is up to 10,412 J/g in the inert gas, which is higher than those of other ratios and the mixtures of other energetic materials and Al. The evolution of pressure output, pressurization rate, and flame temperature was monitored for DAP-4/Al with different mass ratios. Composites DAP-4/Al/F were characterized by burning rates. The combustion reaction mechanism of metal fuel Al with DAP-4 as a high-energy oxidant was provided. DAP-4 was ignited firstly and released acid and oxidizing gases, which corroded Al 2 O 3 shells on Al particle surfaces and accelerated the combustion reaction with Al to release a lot of energy. This work offered a new idea that molecular perovskite energetic materials have great potential in the high-energy Al-based solid rocket propellants.
✓ 已验证
产品关联
DOI
高影响因子
Chemical Engineering and Processing-Process Intensification
·
2023
·
IF 4.3
Qi Zhang,Dongmao Yan,Lixia Li,Guoqiang Yin,Wei Wei,Wenxuan Sun,Shulong Li,Chuan Zhou,Dong Liu,Jingnan Zhao,Qingwei Meng
2,3-dimethyl-4-methylsulfonylbromobenzene(BDSO) is an important intermediate of topramezone, a highly effective corn herbicide. However, its synthesis requires peroxyacetic acid as oxidant and poses a safety risk. In this work, a continuous flow to in situ generations of peroxyacetic acid and thioether oxidation for the preparation of BDSO was developed using a three-stream micromixing process. By in-situ generation and consumption of peroxyacetic acid, the safety hazard of peroxyacetic acid was eliminated, and a green and efficient preparation of BDSO was also achieved. Compared to the batch reactor, the three-stream micromixing process has a shorter residence time(6 min), and higher space-time yield(8.56 mol L −1 h −1 ). This method has great potential in industrial applications.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Jiaming Xiong,Minghui Ye,Zhijian Wang,Jiajun Chen,Yufei Zhang,Yongchao Tang,Cheng Chao Li
The uneven distribution and slow diffusion kinetics of potassium ions (K + ) result in the formation and growth of K dendrites as well as poor rate capabilities, restricting the development of K metal anodes (KMAs). Paired with a Mn-based Prussian blue (PB) cathode, the KMA-based full battery exhibits a low average discharging voltage of ≈3.6 V and a high overpotential. Herein, a N-doped graphene nanomesh (NGM) acts as a conductive and potassiophilic host to solve this issue. First, the NGM enables K + ions to rapidly transport its nanopores and edges to reach the whole electrode, offering unblocked transport channels for K + ions and thus acquiring an enhanced rate capability. Second, the N atoms and defects within NGM reduce the nuclear energy barrier of K + ions and induce their homogeneous deposition, avoiding the formation of K dendrites. Third, the nano-/micro-pores within NGM can accommodate the volume exchange of KMA during cycles, improving its cycling stability. Benefiting from these merits, the symmetric K@NGM cell delivers an ultra-low overpotential of 12.4 mV after 1700 h. Matched with a K 1.7 Mn[Fe(CN) 6 ] 0.9 /graphene cathode, a 4 V and dendrite-free KMnHCF/G‖K@NGM full cell is designed, which exhibits excellent cycling stabilities and rate capabilities.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Xiangming Li,Zihua Lin,Qi Yuan,Bo Sun,Feifei Chen,Zequn Ma,Tao Long,Guanghuan Li,Meng Fu
To develop Pt nanomaterials with facile approach is of great significance for the improvement of their catalytic properties for organic pollutants degradation. In this study, we report a simple in-situ reduction strategy to prepare Pt nanoblocks based on graphene/ polyamino acid self-assembly nanofilms. Polyamino acid modified graphene nanofilms severed as the nanoreactor and reducing agent for further fabrication of Pt nanoblocks. The as-prepared complex efficiently transformed 4-nitrophenol into 4-aminophenol completely within 4.5 min (k app is 0.962 min −1 ) and kept good long-term stability. We expect this work to offer a new valuable insight for facile preparation of Pt materials as efficient and recyclable catalysts for water pollution remediation.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Yanping Guo,Jichun Zhu,Dongxing Kou,Wenhui Zhou,Zhengji Zhou,Shengjie Yuan,Yafang Qi,Yuena Meng,Litao Han,Zhi Zheng,Sixin Wu
The kesterite Cu2ZnSn(S,Se)4 (CZTSSe) solar cells have shown a continuous rise in power conversion efficiencies in the past years. However, the encountered interfacial problems with respect to charge recombination and extraction losses at the CdS/CZTSSe heterojunction still hinder their further development. In this work, an additional plasmonic local electric field is imposed into the CdS/CZTSSe interface through the electrostatic assembly of a two-dimensional (2D) ordered Au@SiO2 NP array onto an aminosilane-modified surface absorber. The interfacial electric properties are tuned by controlling the coverage particle distance, and the finite-difference time domain (FDTD) simulation demonstrates that the strong near-field enhancement mainly occurs near the p-n junction interface. It is shown that the imposed local electric field leads to interfacial electrostatic potential (Velec) augmentation and improves the charge extraction and recombination processes. These electric benefits enable remarkable improvements in open-circuit voltage (Voc) and short-circuit current (Jsc), leading to the cell efficiency being increased from 10.19 to 11.50%. This work highlights the dramatic role of the plasmonic local electric field and the use of the 2D Au@SiO2 NP array to modify a surface absorber instead of the extensively used ion passivation, providing a new strategy for p-n junction engineering in kesterite photovoltaics.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RENEWABLE ENERGY
·
2022
·
IF 8.634
Wenjing Song,Mengxue Song,Wenqing Cai,Weichu Li,Xingmao Jiang,Weiping Fang,Weikun Lai
Development of highly active and stable catalyst for C–O bonds cracking is important in biomass conversion , in this work, we report a SiO 2 -encapsulated NiPt/HY core-shell catalyst for phenethoxybenzene (PEB) catalytic cracking . The as-grown silica shell with defined pores serves as a ‘storage’ to enhance local concentration of PEB and intermediate isomers and promotes catalytic cracking on NiPt/HY core. With the increase of silica shell thickness from 0 to 40 nm, PEB reaction rate has increased more than five times, and the major cracking product selectivity is raised to above 90%, which is attributed to the continuous conversion of PEB isomers within the shell. This designed structure endows the NiPt/HY@SiO 2 with a high activity and no obvious deactivation in PEB cracking to corresponding phenol and aromatics. The outstanding performance benefit from the enrichment effect on the unique core-shell structure, as well as the moderate acidity originated from silica regulation. This work can be extended to the modulation of microenvironment to promote the catalytic behavior of core-shell catalysts.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Li Sun,Yuanyuan Diao,Yuejin Shan,Yuan Zhi,Hua Zhang,Binlin Dou,Weijia Huang
Based on a normal copper wire, an effective photocatalyst (ACW) for the 4-nitrophenol (4-NP) reduction is successfully synthesized by an in-situ redox method. The constitution of ACW is similar to “ants on a tree”, i.e., dense Au and Cu nanoparticles (NPs) are loaded on the copper wire surface covered by submicro-sized Cu cubes. Employing ACW as photocatalyst, the conversion efficiency of 4-NP can achieve to 100% at 2.5 min and the rate constant for the 4-NP reduction can reach up to 1.45 min −1 . Moreover, ACW exhibits satisfactory reusability for 25 cycles and stability in 12 months. These excellent performance can be attributed to the synergistic effect of Au NPs, Cu NPs and the Cu wire surface covered with submicro-sized cubes. Clearly, the above in-situ redox method provides a facile route to prepare metal NPs-supported bulk photocatalysts. Meanwhile, as-synthesized ACW can be a promising photocatalyst candidate for the practical treatment of 4-NP.
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 30
·期 1
·2283-2297
·
IF 5.19
Hu Yuting,Wang Shixing,Zhang Libo,Yang Fan
In wastewater, heavy metal Hg causes serious harm to ecology, so it needs to be removed. In this paper, a novel MOF adsorbent (UiO-66-QU) was prepared by modifying UiO-66-NH 2 with 4-quinolinecarboxaldehyde, which was used to selectively remove Hg(II) from water. The adsorbent was characterized using Fourier transform infrared spectroscopy (FT-IR), field emission scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET), zeta potentiometer, and X-ray photoelectron spectroscopy (XPS). In order to investigate the Hg(II) adsorption performance of UiO-66-QU, the effect of time, initial concentration, pH, and temperature were carried out. Langmuir model fitting shows that the maximum adsorption capacity of UiO-66-QU for Hg(II) is 556 mg/g at 298 K. The experimental results show that UiO-66-QU has better Hg(II) adsorption capacity than UiO-66-NH 2 . The isotherm is in accordance with pseudo-second-order models. It is indicated that the adsorption process is mainly monolayer chemical adsorption. The thermodynamic parameters also indicate that the adsorption process is spontaneous and endothermic. It has excellent reusability and selectivity. XPS and the zeta potential showed that the adsorption mechanism was the complex reaction of Hg(II) with nitrogenous group. Therefore, the adsorbent has potential application prospects in removal of Hg(II) from wastewater.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2022
·
IF 5.204
Xinyu Cui,Quan Wu,Jun Sun,Xiaoyu Gu,Hongfei Li,Sheng Zhang
A boron-based biological flame retardant phenylboronic acid functionalized chitosan (B-CH) was prepared by reacting chitosan (CH) with 4-formylphenylboronic acids. The structure characterization was carried out by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and thermogravimetric analysis. B-CH was added into polylactic acid (PLA) by the melt blending method to improve the fire performance of the composite. The results showed that the peak heat release rate (PHRR) of PLA-7% B-CH decreased to 432 kW·m −2 from 564 kW·m −2 of control PLA. The limiting oxygen index (LOI) was increased from 19.1% to 26.2%, and the vertical burning test (UL-94) could reach a V-0 rating. The B-CH participated in the char formation process, which could generate a continuous compact char layer during the combustion to effectively protect the PLA matrix. This work provided an effective strategy to develop environmental friendly flame retardant PLA composites.
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2022
·
IF 4.432
Ze-Kun Zhang,Shi-Peng Ding,Ze Ye,Ding-Li Xia,Jun-Ting Xu
In this study, the poly(ionic liquid)s (PILs)-based block copolymers (BCPs) with a high charge density, poly(ethylene oxide)- b -quaternized poly(4-vinylpyridinium) with X − as counterion (PEO- b -QP4VP-X), were prepared by full quaternization of the poly(4-vinylpyridine) (P4VP) block in neutral PEO- b -P4VP BCP. The complete quaternization of P4VP block was confirmed by NMR and FT-IR. The phase separation behavior of PEO- b -QP4VP-X BCPs was examined, which was found to be strongly dependent on the counterion species. Specifically, as compared with the neutral PEO- b -P4VP, PEO- b -QP4VP-Br exhibits a stronger segregation strength , while the other three PEO- b -QP4VP-X (X = PF 6 , TFO and TFSI) BCPs show a weaker phase separation ability. The phase behavior of PEO- b -QP4VP-X was explained using the thermodynamic mechanism originally applied for salt-doped BCPs of low charge density. The variation of the Flory-Huggins parameter (Δ χ ) can be divided into three terms: Δ χ 1 due to the change in monomer identity after quaternization, Δ χ Born from the Born energy of counterions and χ Γ arising from the local charge cohesion. For PEO- b -QP4VP-X BCPs, both Δ χ 1 and Δ χ Born are negative, but χ Γ is positive, and they vary with counterion size in different ways. The competition of these three terms dominates the change tendency of phase behavior, among which Δ χ 1 plays an important role at high level of charge density. The rationality of the aforementioned thermodynamic mechanism of Δ χ was also verified by the phase behavior of salt-doped PEO- b -QP4VP-X.
✓ 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）