ACS Materials Letters
·
2023
·
IF 11.4
Xueying Fan,Miao Xu,Weizhe Liu,Aleksandr Kuchmizhak,Lorenzo Pattelli,Yao Li,Hongbo Xu
Traditional environmental photonic sensing based on the balanced reflection of a photonic structure can hardly be applied to distinguish molecular size and homologues, since the refractive index change introduced by these analytes can be too similar to be unambiguously distinguished. Here, a sensing method based on the pore size selectivity and organics adsorption–desorption capacity of self-assembled ZIF-8 photonics crystal is demonstrated, which can tell apart different molecular sizes, homologues, and organics with similar structures and physical properties. Specificity is improved by the inherent relationships between the pore size of ZIF-8 metal–organic frameworks and the associated molecular diffusion rates in the pores, so that the combination of the observed peak shift and recovery time are unique to each analyte. Using this method, selective detection of molecular size is also demonstrated in the case of linear vs cyclic molecules, since only the former can penetrate inside the ZIF-8 pores to induce a large wavelength shift. The reflection peak shift caused by the linear molecules was found to be about 30–40 nm, an order of magnitude larger compared to those for the cyclic molecules. A relationship between the diffusion rate of linear molecules in ZIF-8 pore and the recovery time of photonic crystal reflective peak is further established, linking the recovery time and the linear molecular diffusion coefficient. Finally, different linear molecules are identified by their associated recovery time to detect homologues or organics with similar refractive index.
研究领域:
材料科学
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环境科学
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化学传感
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产品关联
DOI
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Yi Zhao,Meixia Fan,Wenlin Zhou,Yanwei Li,Yan Wang,Zongming Xiu,Baoyu Gao
Sludge generated in wastewater treatment facilities is an integral part for the introduction of silver nanoparticles (AgNPs) to the terrestrial environment, which would cause some adverse ecosystem responses. The understanding of silver release process from the sludge is important to evaluate their risks. In this study, the amount and speciation of the released silver were investigated by taking the sludge generated by wastewater coagulation with AgNPs added (denoted as sludge C-AgNPs ) an example, and kinetic analysis and density functional theory (DFT) calculations were first used to explore the controlling steps and pathways about the silver release. The results showed that sludge C-AgNPs could release the dissolved silver and the colloidal silver. Beside Cl − , Ca 2+ in the leaching solution could enhance the silver release of sludge C-AgNPs , especially for the colloidal silver. The released colloidal silver restricted in size from 40 nm to 100 nm with irregular shape. Although the oxidative dissolution of Ag 0 was the origin of the silver release pathways from the sludge C-AgNPs , the silver diffusion was the controlling step due to the spontaneous binding between silver and the hydrolysates of polyaluminium chloride in sludge C-AgNPs . However, Ca 2+ in the leaching solution could occupy the binding site of silver on sludge C-AgNPs , which would increase the diffusion rate of silver over the oxidative rate of Ag 0 . With this condition, the controlling step of silver release from sludge C-AgNPs turned to the oxidative dissolution of Ag 0 . Our findings are important to assess the fate of AgNPs in wastewater treatment as well as sludge applications.
研究领域:
环境科学
·
化学
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DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Kewei Wang,Baisheng Ma,Tao Li,Chunxiao Xie,Zhenzhong Sun,Dianguang Liu,Jinling Liu,Linan An
In this study, powder mixtures at atomic ratios suitable for formation of Sr(Ti 0.2 Y 0.2 Zr 0.2 Sn 0.2 Hf 0.2 )O 3-x were flash sintered at 1000 °C and 40 mA/mm 2 . X-ray diffraction and energy-dispersive spectroscopy analyses revealed the formation of single-phase oxides after sintering for 1 min. This rapid formation of single-phase oxide was attributed to flash sintering characteristics, which not only enhanced the diffusion rate, but also softened the lattice. Compared to conventional heat treatment sintering, the sintering time was shortened to 1 min from 10 h, while the sample temperature was reduced to 1314 from 1500 °C. Therefore, flash sintering is a promising technique for rapid synthesis of high-entropy oxides.
研究领域:
材料科学
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陶瓷工程
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产品关联
DOI
高影响因子
CHEMIE INGENIEUR TECHNIK
·
2021
·
IF 1.672
Luxi Lyu,Houxiao Wu,Libo Li,Yanying Wei,Haihui Wang
Metal-organic frameworks (MOFs) show great potential for adsorption separation. However, MOFs' flexibility may influence their adsorption behaviors. Here, for the first time we prepare ZIF-8 powder dominated with stiffened ZIF-8_Cm phase under an external E-field. By comparison, we find that the flexibility of ZIF-8 has little influence in equilibrium-based separation behavior for C 3 H 6 /C 3 H 8 . However, the stiffened ZIF-8 formed in E-field presents an obviously decreased diffusion rate for C 3 H 8 , whose C 3 H 6 /C 3 H 8 kinetic-based separation factor is around 2.5 times higher than that of the traditional ZIF-8 powder.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xuan Tang,Xiaowei Bai,Yating Wang,Xu Yang,Xiaomin Li,Jinping Li,Jiangfeng Yang
The separation of nitrogen and methane via molecular sieving is often accompanied by mass transfer limitations. Here, we report a NaK-PHI zeolite that not only achieves the precise sieving of nitrogen and methane, but also significantly enhances the diffusion rate of nitrogen. By adjusting the framework composition of the zeolite, the metal cation in the NaK-PHI channel allows smaller nitrogen molecules to enter the channel but blocks methane entry, achieving precise N 2 /CH 4 sieving. A growth inhibitor (GI) was introduced to reduce the crystal size of the NaK-PHI@GI zeolite, and the adsorption kinetics were optimized, resulting in a diffusion rate enhancement of approximately three times; NaK-PHI@GI also exhibited an enhanced nitrogen adsorption capacity (10.5 cm 3 g −1 ) as well as a higher nitrogen/methane uptake ratio (20.9). After multiple cycle-breakthrough tests and regeneration processes involving evacuation and depressurization, NaK-PHI@GI maintained a stable separation capacity, confirming its good recyclability.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
高影响因子
Polymers
·
2021
·Vol. 13
·期 11
·1754
·
IF 4.329
Huishi Pi,Weiping Li,Zhiwei Shi,Haining Chen,Xiaoyu Jiang
N-vinylpyrrolidone (NVP) has a large molecular structure, so it is difficult to diffuse during holographic recording, especially at low spatial frequencies. We used glycerol to promote the diffusion of NVP, and successfully improved the holographic performance of the photopolymer at low spatial frequencies. As the concentration of glycerol increases, the holographic performance first increases and then remains stable. The optimal concentration of glycerol is 0.21 mol/L. At this concentration, the maximum diffraction efficiency of the photopolymer is 84%, the refractive index modulation is 1.95 × 10−3, and the photosensitive sensitivity is 7.91 × 10−4cm2/mJ. Compared with the control group, the maximum diffraction efficiency, maximum refractive index modulation and photosensitivity at low spatial frequencies (800 lp/mm) have increased by 11.19 times, 4.69 times and 1.71 times, respectively. Using the optimized photopolymer for transmission holographic recording and reproduction, we have obtained a clear and bright transmission hologram. The photopolymer modified with glycerol is expected to be applied to the fields of holography, diffractive optics, and so on.Keywords:transmission holography;photopolymer;polymerization rate;diffusion rate;diffraction efficiency
研究领域:
光学材料
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全息技术
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DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2023
·
IF 9.5
Jun Cheng,Zheyu Li,Xian Bao,Ruijun Zhang,Zhiqiang Zhang,Guangtong Hai,Kai Sun,Wenxin Shi
An urgent challenge during the preparation of polyamide thin film composite membrane via the interfacial polymerization method was excessive diffusion rate of piperazine to form uncontrollable polyamide layer thickness, ultimately leaded to low water permeability to increase the operating cost. Herein, a uniquely new method, which brought down one order of magnitude of piperazine concentration to ultra-low grade (0.01% w·v −1 ) to retard the diffusion rate, was utilized to avoid the problem. However, the ultra-low concentration of piperazine could not easily react with trimesoyl chloride, bis-tris propane as conditioning agent was needed to overcame the trouble. The kinetics diffusion process of piperazine under the function of bis-tris propane was intensively studied by molecular dynamics simulation and other characterizations. Bis-tris propane could combine with piperazine to generate intermolecular force and then carry piperazine molecules moving toward the interface of aqueous/organic phase, which tuned the trans -state of piperazine to the benefit of rection. This work offered a novelty insight to surmount the problem of the excessive diffusion rate, which could promote the development of membrane technology .
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-12
·
IF 15.7
Zou Guodong,Wang Jinming,Sun Yong,Yang Weihao,Niu Tingting,Li Jinyu,Ren Liqun,Seh Zhi Wei,Peng Qiuming
Sodium (Na) metal batteries are considered promising solutions for next-generation electrochemical energy storage because of their low costs and high energy densities. However, the slow Na dynamics result in unfavorable Na deposition and dendrite growth, which compromise cycling performance. Here we propose a nanotwinned alloy strategy prepared by high-pressure solid solution followed by Joule-heating treatment to address sluggish Na dynamics, achieving homogeneous Na deposition. By employing cost-effective Al-Si alloys for validation, Si solubility of 10 wt.% is extended through a high-pressure solid solution, and nanotwinned-Si particles, with a volume fraction of 82.7%, are subsequently formed through Joule-heating treatment. The sodiophilic nanotwinned-Si sites exhibit a high diffusion rate, which reduces the nondimensional electrochemical Damköhler number to far below 1, shifting the diffusion-controlled deposition behavior to reaction-controlled deposition. This transition facilitates spherical Na deposition and dendrite-free growth, allowing a symmetric cell to achieve stable Na plating/stripping over 5300 h at 5 mA cm −2 with a cumulative capacity of 13.25 Ah cm −2 . This strategy is also demonstrated in another CuAg system with nanotwinned Ag structures.
研究领域:
材料科学
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电化学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Shuai Zhang,Shiliang Luan,Ke Ren,Baosheng Xu,Yiguang Wang
Hot-corrosion behavior of Ba 1/3 Sr 1/3 Ca 1/3 Al 2 Si 2 O 8 (BSCAS) in the presence of molten calcium-magnesium-aluminum-silicate (CMAS) is investigated in the temperature range of 1250–1350 °C. In comparison, the hot corrosion behavior of Ba 0.5 Sr 0.5 Al 2 Si 2 O 8 (BSAS) is also studied under the same conditions. The results indicate that CMAS corrosion of both BSCAS and BSAS is caused by the interdiffusion of Ba/Sr and Ca between CMAS and corroded samples. The presence of Ca cations in BSCAS lowers the diffusion driving force of Ca cations between CMAS and BSCAS, resulting in a reduced diffusion rate of Ca cations from CMAS into BSCAS. Moreover, the sluggish diffusion effect of multi-component cations hinders the outward diffusion of Ba/Sr cations from BSCAS. Thus, the BSCAS shows a better CMAS corrosion resistance than BSAS.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2023
·
IF 2.5
Nie Liu,Zhang Donghuai,Hu Jie,Sun Jian,Lai Changgan,Guo Zhiliang,Wang Helin,Ji Shuai,Lei Lixu
Lead formate (LF) has been successfully prepared from compounds in spent lead-acid batteries by a simple and low-cost method. The irregular sheets of LF pile up to form agglomerated particles. When it is used as an additive in the negative electrode, it makes the electrode perform better and be able to discharge a capacity of 107 mAh g −1 at 100 mA g −1 to 1.75 V; it still discharges 86.5 mAh g −1 after 1200 cycles. EIS shows that the electrode has lower resistance and higher ion diffusion rates than the one without LF. The reason could be that LF produces formic acid when it meets sulfuric acid, and the formic acid could clear up the oxide on lead alloy grid as well as basic lead sulfate in the electrode, thus making the conduction network grow better.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2015
·
IF 2.515
Yajie Jiang,Tao Geng,Qiuxiao Li,Guojin Li,Hongbin Ju
The equilibrium and dynamic surface tension properties of a series of 1:1 salt-free catanionic surfactants (alkyltrimethylammonium decanoate) were investigated; and, the influence of the length of hydrocarbon chain of cationic part (carbon number of 10, 12, 14, 16, 18, respectively) on the surface properties was discussed. The plot of the logarithm of the critical aggregation concentration (cac) against the carbon number showed a linear decrease with an increase in chain length. On the basis of the slope of this plot, it was found that the variation of cac with the chain length is smaller for salt-free catanionic surfactants (C + n –C − 10 ) than that for single anionic or cationic surfactants. The surface tension at the cac was quite low, much lower than that of single cationic or anionic surfactants at cmc. At dilute surfactant concentration, the adsorption process is diffusion-controlled adsorption; at higher concentration (above cac), it became the mixed diffusion-kinetic mechanism. The diffusion rate of the monomer for the salt-free catanionic surfactants was lower than that of conventional cationic or anionic surfactants, due to a larger molecular size. Furthermore, it was confirmed that the kinetic energy of adsorption at the gas/solution interface decreased with an increase in the hydrocarbon chain length.
研究领域:
物理化学
·
表面科学
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产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2014
·Vol. 16
·期 37
·8910-8916
·
IF 3.858
Feng Ye,Hui Liu,Wenlai Huang,Jun Yang
Controlling the morphology of noble metal nanoparticles can be an effective way to produce nanomaterials with favourable properties. Herein, we report our study on the effects of diffusion rate and reaction kinetics on the morphology of a number of noble metal (Au, Ag, Pd, and Pt) nanoparticles. A glass reactor based on electrochemical reduction or photo-reduction has been designed to achieve control of diffusion and chemical reduction of the different noble metal precursors. The results show that the noble metal nanoparticles with flower-like, core–shell, or wheel-like morphologies could be obtained at a relatively high diffusion rate due to the presence of additional growth of metal precursors on the preformed metal nuclei, while at relatively low diffusion, the as-prepared noble metal nanoparticles are small and quasi-spherical due to the relatively fast reduction of metal precursors. The experimental observations are also confirmed qualitatively by kinetic Monte Carlo (kMC) simulations. Since diffusion and reaction kinetics are universal and key factors in the synthesis of nanomaterials, the findings in this work might provide an effective way to manipulate the morphology of nanomaterials for a given application.
研究领域:
纳米材料科学
·
物理化学
·
材料合成
·
胶体与界面化学
·
计算材料学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）