ACS Omega
·
2020
·
IF 2.87
Sanbao Dong,Chenwei Liu,Weiwei Han,Mingzhong Li,Jie Zhang,Gang Chen
Clathrate hydrates are ice-like compounds consisting of small gas molecules enclosed in water molecule cages. The formation of gas hydrate in oil and gas pipelines may result in flow assurance failure and serious safety and environmental concerns. Antiagglomeration is a promising method to mitigate gas hydrate risks in hydrocarbon flowlines. Morphological behavior of hydrates in the presence of antiagglomerants can provide important information on the antiagglomeration mechanisms. This study reports the visual observations of the morphology of hydrate formed with a water droplet immersed in cyclopentane with and without the presence of a hydrate antiagglomerant (AA). The effect of AA on the hydrate crystal growth was investigated. The AA exhibited a kinetic inhibition effect. With no AA, a faceted hydrate shell formed around the water droplet was observed. The subcooling can affect the rate of lateral growth. Higher subcooling facilitates hydrate growth. With the presence of 0.04 wt % AA, a hairy and porous morphology of hydrate was observed. At higher AA concentrations, a vertical type of growth after the lateral growth of the hydrate shell was observed. This is probably the first report of vertical growth of cyclopentane hydrate formed with a water droplet. A hypothesis is proposed to explain the vertical growth mechanism of the hydrate crystals.
研究领域:
化学工程
·
石油工程
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DOI
高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 33
·10379-10388
·
IF 6.641
Tao Hua,Keyi Zhang,Zu-Sheng Huang,Lingyun Wang,Hao Tang,Herbert Meier,Derong Cao
In this paper, the encapsulated insulated molecular wire (EIMW) and 2′,7′-bis(hexyloxy)spiro[cyclopenta[2,1-b:3,4-b′]dithiophene-4,9′-fluorene] (SPDF) were specifically designed as efficient anti-aggregation π-bridges for two novel D–A–π–A metal-free sensitizers (IBT1 and IBT2). Compared with the reference dye IBT3 with 3,3′-dihexyl-2,2′-bithiophene (DHBT) as an anti-aggregation π-bridge, both the dyes IBT1 with EIMW and IBT2 with SPDF as π-bridges can suppress intermolecular aggregation more efficiently. The π-bridge of SPDF shows the strongest anti-aggregation ability due to the rigid ‘T’ configuration among these dyes. Meanwhile, the π-bridge of EIMW shows better anti-aggregation ability than DHBT because of the larger steric hindrance of the former. Finally, when the dyes IBT1 and IBT2 are co-sensitized with IBT3, respectively, the new devices exhibit high efficiencies of 7.85% and 7.64%, respectively, which are comparable to that of N719 (7.85%). The results demonstrate that the dyes with EIMW and SPDF as anti-aggregation π-bridges are promising candidates for efficient DSSCs and dye aggregation can be effectively inhibited by structural engineering of the π-spacer.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
CELLULOSE
·
2020
·Vol. 27
·期 15
·8843-8858
·
IF 4.21
Jiang Mengting,Zhang Yakang,Chen Jingwen,Liang Qian,Xu Song,Yao Chao,Zhou Man,Li Zhongyu
A series of morphology-controlled BiOBr nano/macrostructures was successfully synthesized via a novel biomass-route derived from bacterial cellulose (BC). In the BiOBr/BC system compared with pure BiOBr, the three-dimensional BC scaffolds not only effectively prevented the aggregation of BiOBr units by pore confinement, but also strengthened the controllability of BiOBr size with the help of abundant anchoring sites provided by cross-linked BC fibers. By associating the results of characterizations and the photodegradation of RhB dye, the relationship between morphology and photocatalytic activity of BiOBr/BC was investigated. In addition, a possible mechanism for the enhanced photocatalytic activity of the optimized BiOBr/BC has been discussed. This biomass-derived route provides a platform for further design of bismuth-based composite photocatalysts with potential advantages of being anti-aggregation, highly-dispersed, easily recovered and having enhanced catalytic performance.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
Analytical Methods
·
2017
·Vol. 9
·期 19
·2890-2896
·
IF 1.9
Zhuangwei Zhou,Yujie Zhang,Jingyan Kang,Chen Dong,Ningyi Chen,Xing Li,Zhiyong Guo,Aiguo Wu
In this study, a new detection method for glyphosate (GPS) based on an anti-aggregation mechanism by using gold nanoparticles (AuNPs) is proposed. A certain amount of Pb2+ can cause the aggregation of AuNPs because of electrostatic interactions and the color of the solution changed from red to gray. However, in the presence of GPS, the above-mentioned process can be strongly hindered due to the chelation between GPS and Pb2+. Based on this anti-aggregation mechanism, the colorimetric detection method exhibits excellent sensitivity for GPS. The limit of detection (LOD) is 0.5 μM by the naked eye and 2.38 nM by UV-vis spectroscopy. The selectivity of the AuNP detection system for GPS is excellent compared with other pesticides. A good linear relationship (R2 = 0.99695) between the absorption intensity ratio and GPS concentrations indicates that our probe can be used for the quantitative assay of GPS. The detection method has been successfully used for detecting GPS in real environmental samples.
研究领域:
分析化学
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环境科学
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2013
·
IF 3.535
Hao-Hua Deng,Chun-Lin Wu,Ai-Lin Liu,Guang-Wen Li,Wei Chen,Xin-Hua Lin
A convenient colorimetric sensor based on anti-aggregation of citrate-capped gold nanoparticles (AuNPs) is demonstrated for thiocyanate (SCN − ) sensing. The citrate-capped AuNPs aggregated readily in the presence of sulfuric acid , leading to a color change from red to blue. This particle aggregation could be suppressed by SCN − , which had strong protective effect on the gold colloid . The thiocyanate recognition suffers insignificant interference from most of common ions. With this strategy, 1 μM of SCN − can be recognized within 5 min by naked-eye observation. This simple, selective, and sensitive approach can be potentially applied for SCN − assays in environmental aqueous samples.
研究领域:
分析化学
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纳米科技
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环境科学
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DOI
高影响因子
Nanomaterials
·
2018
·Vol. 8
·期 7
·499
·
IF 3.504
Guangyang Liu,Ruonan Zhang,Lingyun Li,Xiaodong Huang,Tengfei Li,Meng Lu,Donghui Xu,Jing Wang
Monitoring of low levels of chlorsulfuron in environmental water samples is important. Although several detection methods have been developed, they all have some drawbacks, such as being time-consuming, requiring expensive instruments and experienced operators, and consuming large volumes of organic solvents. There is an urgent need for a simple, rapid, and inexpensive detection method for chlorsulfuron. Herein, such a method was developed using anti-aggregation of gold nanoparticles (AuNPs) in the presence of acetamiprid in agricultural irrigation water samples. Aggregation of the AuNPs was induced by acetamiprid, and this produced a distinct color change from Bordeaux red to blue. However, the strong hydrogen bonding interaction between chlorsulfuron and acetamiprid could inhibit AuNP aggregation. The effect of chlorsulfuron on the anti-agglomeration behavior of AuNPs was monitored by ultraviolet–visiblespectroscopy (UV-Vis) and the naked eye over a concentration range 0.1–100 mg/L. The detection limit for chlorsulfuron was 0.025 mg/L (signal-to-noise ratio of three). This colorimetric method was successfully applied to the determination of chlorsulfuron in spiked tap water and agricultural irrigation water with satisfactory recoveries (76.3%–94.2%).
研究领域:
环境科学
·
分析化学
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DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2019
·Vol. 411
·期 12
·2645-2652
·
IF 3.286
Li Dongxian,Wang Shun,Wang Ling,Zhang Hao,Hu Jiandong
In this study, a simple colorimetric probe was developed for rapid and highly sensitive detection of malathion based on gold nanoparticles (AuNPs) anti-aggregation mechanism. A certain amount of NaOH can cause the aggregation of citrate-stabilized AuNPs due to the electrostatic interactions, and the color of AuNP solution changes from wine-red to gray. While in the presence of malathion, malathion is easily hydrolyzed in a strong alkali environment (pH > 9), followed by the production of a mass of negative charges, and thus the aggregated AuNPs turns to well-dispersed and the color of AuNP solution changes from gray to wine-red. This characteristic change can be visualized with the naked eye and quantitatively detected by an ultraviolet-visible (UV-Vis) spectrometer. Under optimized conditions, this probe exhibited a linear response to malathion in the concentration range of 0.05–0.8 μM with a limit of detection (LOD) down to 11.8 nM. The probe also showed good specificity for malathion detection in the presence of other interfering pesticide residues. Furthermore, the probe was successfully employed to detect malathion in environmental samples, with a recovery of 94–107% and a relative standard deviation (RSD) less than 8%. The results demonstrated that the proposed colorimetric probe based on anti-aggregation of AuNPs could be used for quantitative analysis of malathion and provided great potential for malathion determination in environmental samples.
研究领域:
分析化学
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环境科学
·
农业科学
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产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2012
·
IF 3.898
Wenquan Liu,Zongfeng Du,Yi Qian,Feng Li
A simple, highly sensitive and selective colorimetric strategy for phosphate (Pi) detection is proposed based on anti-aggregation of gold nanoparticles (AuNPs) via competition reaction between Pi and carboxylate group-modified AuNPs for Eu 3+ ions. In the presence of Eu 3+ , MA-AuNPs underwent an aggregation process due to the coordination of Eu 3+ with neighboring carboxylate groups, revealing a color change from wine red to blue. Once Eu 3+ ions were pre-mixed with Pi and then introduced into MA-AuNPs, the coordination of carboxylate groups with Eu 3+ would be significantly interrupted due to the higher binding affinity of Eu 3+ for Pi. Accordingly, the solution color of MA-AuNPs changed from blue to red with increasing the concentration of Pi. The anti-aggregation effect of Pi on AuNPs was seen by the naked eye and monitored by UV–vis extinction spectra. The linear range of the colorimetric sensor for Pi is from 5.0 × 10 −7 M to 3.0 × 10 −5 M with a low detection limit of 76 nM. The as-established colorimetric strategy opened a new avenue for Pi determination.
研究领域:
分析化学
·
纳米生物学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Hui Zhao,Xin-Pu Fu,Wei-Wei Wang,Jin-Cheng Liu,Chun-Jiang Jia
Despite the supported Au demonstrating superior activity in catalyzing various reactions, their stubborn and widespread deactivation issue has long remained unsolved. Therefore, the challenge in current investigations of Au-based catalysts could be divided into two aspects: uncovering the authentic molecular induction for the deactivated evolution and fabricating interfacial structures combining efficiency and stability. In this work, by incorporating NiO x (H) adjacent to small active Au 1 /Au n species, the as-formed 0.5Au-5NiO x (H)/CeO 2 catalyst simultaneously achieved high reactivity ( r = 5.23 mmol CO ·g Au −1 ·s −1 ) toward the water-gas shift (WGS) reaction and remarkable long-term stability with time-on-stream of 100 h at 250 °C, significantly surpassing the reference Au/CeO 2 counterpart as well as the other oxides-supported Au catalysts reported previously. Comprehensive in-situ characterizations and DFT calculations revealed that the CO molecules, rather than H 2 , H 2 O, or CO 2 molecules, are the dominant molecular driver for Au aggregation, correspondingly inducing the degraded catalytic efficiency. Specifically, on the one hand, the strong CO−Au coordination degraded the ejection barrier of Au atoms from Au-Au coordination; on the other hand, the −OH groups as intermediates from H 2 O dissociation, participating in the stabilization of Au species upon the surface, were dynamically consumed by CO molecules. For these regards, the adjacent Ni adatoms promote the sufficient generation of stable −OH groups for stabilizing Au atoms under WGS reaction. As a result, the corresponding Au−Au ejection and Au−O diffusion barriers of as-formed Au n −O(H)−Ni/CeO 2 combinations are significantly enlarged, which thereby boosts the structural stability in the CO-containing atmospheres.
研究领域:
催化化学
·
材料化学
·
表面科学
·
物理化学
·
能源化学
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产品关联
DOI
高影响因子
SENSORS
·
2018
·Vol. 18
·期 5
·1595
·
IF 2.475
Guangyang Liu,Ruonan Zhang,Xiaodong Huang,Lingyun Li,Naixin Liu,Jing Wang,Donghui Xu
Various highly sensitive and selective analytical methods have been used to monitor metsulfuron-methyl residue in the environment. However, these methods involve costly instruments and complex, time-consuming operations performed in laboratories. Here, a rapid, convenient, and sensitive colorimetric sensor based on anti-aggregation of gold nanoparticles (AuNPs) is demonstrated for the rapid detection of metsulfuron-methyl in agricultural irrigation water. The AuNPs could be induced to aggregate in the presence of melamine and exhibited a distinct color change from wine-red to blue. The aggregation was suppressed by a strong hydrogen-bonding interaction between metsulfuron-methyl and melamine. The differences of the absorbance at 523 nm (ΔA523) and the color change was linearly related to metsulfuron-methyl concentration over the range 0.1–100 mg/L, as observed visually and by UV-vis (Ultraviolet-visible) spectrometry. The detection limit of the sensor was as low as 0.05 mg/L (signal/noise = 3), and was used to determine metsulfuron-methyl in spiked water and in agricultural irrigation water samples. Recoveries were in the range of 71.2–100.4%, suggesting that the colorimetric sensor was suitable for the determination of metsulfuron-methyl in agricultural water samples.Keywords:colorimetric sensor;gold nanoparticle;anti-aggregation;metsulfuron-methyl;melamine;agricultural irrigation water
研究领域:
环境科学
·
分析化学
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产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 16
·6435-6442
·
IF 3.288
Jing Li,Jinfu Ma,Hui Lu,Zhilin Sheng,Shaolin Yang,Jiandong Wu
Although carbon nanomaterials show good potential as efficient electrocatalysts for oxygen reduction reaction (ORR), their inferior long-term stability due to their high surface energy resulting in compact restacking limits their practical performance. To overcome this issue, here, we design and construct an anti-agglomerating single-walled carbon nanotube (SWNT) catalyst by using poly-3,4-ethylenedioxythiophene (PEDOT) as an upholder. Physical characteristic results indicate that PEDOT effectively fills in the interweaved zone or adheres to the SWNT surface. Furthermore, S atoms can be doped into the lattice and produce more defects. Electrochemical tests show that SWNTs@PEDOT exhibits similar catalytic activities towards ORR to SWNTs, and both of them can realize a quasi-4e ORR pathway. Within a 32 000 s long-term test, the cathodic current of the SWNTs toward ORR gradually decays to 58% of the initial value; in contrast, SWNTs@PEDOT shows excellent stability with several stages of rise, fall, rise to 105% of the initial current. The excellent stability is due to the stable skeleton caused by PEDOT preventing agglomeration of SWNTs. The equilibrium of swelling and shrinkage of PEDOT even lead to an increase and favorable stability of the current. This suggests a practical method to overcome the weakness of agglomeration, thus enhancing the long-term stability for nano-carbon catalysts.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
ENERGY & FUELS
·
2016
·
IF 2.835
Xiao-Qin Wang,Hui-Bo Qin,Qing-Lan Ma,Zhen-Feng Sun,Ke-Le Yan,Zhi-Yu Song,Kai Guo,Da-Meng Liu,Guang-Jin Chen,Chang-Yu Sun
A terrestrial plant fruit extract was adopted to prevent hydrate accumulation. Four groups with different polarities, water-soluble, n-butanol-soluble, ethyl acetate-soluble, and petroleum ether-soluble portions, were obtained by prefractionation of the plant-extract hydrate antiagglomerant (AA). The hydrate antiagglomeration effect was tested in a high pressure transparent sapphire cell, and the active components were found mainly in the ethyl acetate-soluble portion that accounts for approximately 4.0% of the whole plant extract. Through further separation and purification, the five kinds of components obtained proved experimentally to have the effect of preventing hydrate agglomeration. Their molecules and structural formulas were inferred by the high resolution mass spectrum and nuclear magnetic resonance analysis. Compared with the spectrum library, the components were determined to be eriodictyol, apigenin, naringenin, luteolin, and 5-(4-hydroxy-6,7-dimethoxy-3-methylchroman-2-yl) benzene-1,2,3-triol. The tests on the extracted components and the commercial products verified their effect of preventing hydrate agglomeration, where apigenin and luteolin performed better than others.
研究领域:
化学工程
·
植物化学
·
能源科学
✓ 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）