TALANTA
·
2026
·
IF 6.7
Mingzhi Jiao,Xinyang Chen,Bing Deng,Kaiguo Mao,Chenyu Wen
Monitoring and identification of combustible gases are crucial tasks in fields such as industrial safety, environmental protection. In real-world scenarios, different types of combustible gases, such as H 2 , C 2 H 4 , and C 2 H 2 , often coexist, which makes recognition more difficult. To address this challenge, we propose a gas sensor based on a ZnO–Au–SnO 2 heterostructure. The morphology and chemical state of the material were characterized using scanning electron microscopy and X-ray photoelectron spectroscopy, which revealed a uniform distribution of Au and binding-energy shifts indicative of electron transfer between ZnO and SnO 2 . Experimental results demonstrate that modifying Au and SnO 2 significantly enhances the sensor's response to H 2 , C 2 H 4 , and C 2 H 2 . By applying a one-dimensional convolutional neural network (1DCNN) to a sensor array, efficient feature extraction of response signals and high-precision gas classification were achieved. The recognition accuracy for gas mixtures exceeds 96%. Furthermore, the lightweight 1DCNN model has been deployed on a Raspberry Pi edge computing platform, verifying its feasibility on small-sized, low-power devices. The system achieves millisecond-level inference and high-confidence predictions, indicating its potential for real-time on-site gas detection. This study synergistically optimizes the gas sensing system from both material and algorithm aspects, providing a feasible way to the intelligent recognition of multi-component combustible gases.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Wenxiang Zhang,Yinhui Li,Yue Wu,Yu Fu,Shuhui Chen,Zhonghui Zhang,Songjie He,Tong Yan,Heping Ma
Recovering of high value-added perfluorinated electronic specialty gases (F-gases) in plasma etching waste gas is a challenging task in the silicon-based semiconductor industry. In recent years, the adsorptive separation technology based on porous materials has been regarded as a effective strategy to capture and recover F-gases due to its energy-saving and high operational feasibility. Herein, two porous organic polymers (POPs) with fluorinated skeleton structure (termed POPTrA-4F and POPTrA-8F) were developed to selective capture and recycle of F-gases in plasma etching exhaust gas. Single-component gas adsorption and IAST calculation show that two fluorinated porous polymers can selectively capture F-gases from mixed gas. Theoretical simulations based on DFT reveal the selective adsorption mechanism of fluorinated polymers to F-gases at molecular level, and give the binding energy between polymers and gas molecules. Furthermore, time-dependent adsorption rate tests and dynamic breakthrough experiments confirm that two fluorinated polymers could preferentially adsorb F-gases and exhibit excellent cycling durability. These results demonstrate that fluorine-functionalized POPs have great potential to effectively capture and recover F-gases in plasma etching exhaust gas.
研究领域:
材料科学
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环境工程
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化学工程
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半导体技术
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2021
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IF 5.279
Jinju Ma,Zhiqiang Zhou,Kai Li,Xinghao Tu,Kun Li,Lanxiang Liu,Juan Xu,Wenwen Zhang,Liqing Du,Chunyin Li,Hong Zhang
Food wastage represented by the deterioration of perishable food like fruits and vegetables is a serious global problem with tremendous ethical, financial, and environmental costs. The atmosphere (CO2 and O2) has a crucial role in food storage and can regulate physiological food metabolism and microbial growth. Modified atmosphere packaging (MAP) is a promising method used to extend shelf life and preserve the quality of perishable food; yet, its use depends on the specific gas permeability and selectivity of polymer membranes to generate an atmosphere desirable for storage. In this study, we established and validated a new plant leaf-mimetic shellac-based MAP membrane embedded with chitosan porous microspheres loaded with antimicrobial tannic acid (TA-CPM) as gas “switches” for regulating O2 and CO2 permeability and CO2/O2 selectivity. The effects of different amounts of TA-CPM added into the hybrid membranes were examined for litchi preservation at room temperature. Our results showed that this hybrid TA-CPM/shellac packaging membrane could regulate the internal CO2 and O2 concentrations and the CO2/O2 ratio within the packages containing litchis by adjusting the addition amount of TA-CPM. The 0.05% TA-CPM/shellac and 0.10% TA-CPM/shellac packages, especially 0.05% TA-CPM/shellac, generated a more desirable CO2 and O2 atmosphere for litchi preservation compared with controls, which was reflected by the delaying of browning and rotting, maintaining of the natural color of the litchi pericarp, preservation of pulp quality, inhibition of polyphenol oxidase and guaiacol peroxidase activities, and reduction of oxidative cell damage in litchis. The results suggested that 0.05% TA-CPM/shellac and 0.10% TA-CPM/shellac packaging membranes, especially 0.05% TA-CPM/shellac, could generate an ideal atmosphere for litchi storage at room temperature, demonstrating that this permeation-controlled hybrid membrane has great potential in food preservation and other applications requiring a modified atmosphere.
研究领域:
食品科学
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材料科学
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PubMed
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2024
·
IF 4.1
Zhihua Zhao,Zhikun Wang,Chunhua Zheng,Guixin Jin,Xiaoqing Shen,Lan Wu
Nitrogen dioxide is a toxic gas to the human body, which is the cause of acid rain and respiratory diseases. In this study, VTe 2 was first created for use in gas sensors by hydrothermal synthesis. After examining the gas-sensitive characteristics, it was found that the VTe 2 gas sensor responds 105 % to 50 ppm nitrogen dioxide (NO 2 ) gas at 140°C and 40 % relative humidity (RH), with a relative humidity setting temperature of 25°C. Furthermore, the sensor has fast response recovery time, good selectivity, repeatability, stability and moisture resistance. Finally, a sensing mechanism for NO 2 detection was suggested.
研究领域:
材料科学
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环境科学
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传感技术
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2025
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IF 7.7
Wenyu Li,Hui Yu,Ming Yang,Xiangting Dong,Ying Yang,Tianqi Wang
Photosensitized metal oxide gas sensors have been a research hotspot in the field of gas sensors in recent years, the vast majority of related studies use the ultraviolet light as the excitation light source, there are relatively few related studies on the ceramic gas sensors using a single LED as the excitation light sources, and even fewer studies on using natural sunlight as the light excitation source. In this study, porous ZnO precursor particles were introduced into the channels of ZIF-8 to ensure the integrity of its skeleton after calcination, and ZnO/ZIF-8 derivative was prepared and used to construct gas sensors to detect NO x under the different excitation light source (the natural sunlight, 365 nm LED and xenon lamp). Compared with the test under darkness conditions, the operating temperature was reduced 70℃ under light excitation conditions, the gas-sensitive response of the gas sensor to 20 ppm NO x under the natural sunlight excitation was 7.48 times of the darkness conditions, and the measured detection limit was as low as 50 ppb. Under the excitation of natural sunlight, 365 nm LED or xenon lamp, the room temperature gas sensitive response to NO x gas could be achieved. The prepared gas sensor was used for the actual detection of NO x concentration in vehicle exhaust, which showed the attractive practicality and excellent detection sensitivity.
研究领域:
气体传感器
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材料科学
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环境监测
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光电传感
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纳米材料
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高影响因子
Soft Matter
·
2022
·Vol. 18
·期 43
·8251-8261
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IF 4.046
Hengxin Fang,Zhanli Geng,Nan Guan,Limin Zhou,Lijuan Zhang,Jun Hu
Spherical nanobubbles and flat micropancakes are two typical states of gas aggregation on solid–liquid surfaces. Micropancakes, which are quasi-two-dimensional gaseous structures, are often produced accompanied by surface nanobubbles. Compared with surface nanobubbles, the intrinsic properties of micropancakes are barely understood due to the challenge of the highly efficient preparation and characterization of such structures. The hydrophobicity of the substrate and gas saturation of solvents are two crucial factors for the nucleation and stability of interfacial gas domains. Herein, we investigated the synergistic effect of the surface hydrophobicity and gas saturation on the generation of interfacial gas structures. Different surface hydrophobicities were achieved by the aging process of highly oriented pyrolytic graphite (HOPG). The results indicated that higher surface hydrophobicity and gas oversaturation could create surface nanobubbles and micropancakes with higher efficiency. Strong surface hydrophobicity could promote nanobubble nucleation and higher gas saturation would induce bigger nanobubbles. Degassed experiments could remove most of these structures and prove that they are actually gaseous domains. Finally, we draw a region diagram to describe the formation conditions of nanobubbles, micropancakes based on observations. These results would be very helpful for further understanding the formation of interfacial gas structures on the hydrophobic surface under different gas saturation.
研究领域:
材料科学
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界面化学
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DOI
高影响因子
Gas Science and Engineering
·
2023
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IF 0
Xian Sun,Xiao-Hui Wang,Peng Xiao,Yi-Fei Sun,Xing-Xun Li,Wei-Xin Pang,Qing-Ping Li,Chang-Yu Sun,Guang-Jin Chen
Hydrate reservoirs with underlying gas show significant potential for commercial exploitation. An experimental apparatus capable of applying confining pressure and axial pressure was built to simulate the accumulation and dissociation of naturally occurring marine hydrate and a novel method for synthesizing hydrate reservoirs with underlying gas was proposed. With the formed methane hydrate-bearing coarse sediment (HBCS) with underlying gas, hydrate dissociation experiments via depressurization under constrained conditions were carried out at different HBCS proportions. The characteristics of heat transfer and dual-gas co-production during the exploitation of hydrate reservoir at various HBCS proportions were presented. Due to the influence of hydrate decomposition, the diverging temperature variations of the underlying layer and upper HBCS layer were observed at HBCS proportions of 0.21, 0.48, and 0.77. The negative effect of the outside pressure on gas production was not observed in our experimental conditions owing to the adopted coarse quartz sand deposits. The final produced gas volume increases with the HBCS proportion increasing. The produced gas percentage is negative or positive related to the HBCS proportions respectively with the extended production time. In addition, the different production behavior of the underlying gas and hydrate decomposed gas may induce the unexpected exploitation accidents such as blowouts resulting from unstable gas production rate. These findings guide the design of exploitation scheme for reservoirs with different HBCS distribution. And an exploitation method by setting the production well in the underlying gas layer/underlying sediment layer with free gas is then proposed, which can inhibit hydrate reformation and ice generation and improve the production well stability during the hydrate exploitation process.
研究领域:
海洋地质学
·
能源工程
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DOI
Industrial Chemistry & Materials
·
2024
·
IF 0
Huige Chen,Zhenhua Li,Chao Zhou,Run Shi,Tierui Zhang
The exothermic characteristic of the water-gas-shift (WGS) reaction, coupled with the thermodynamic constraints at elevated temperatures, has spurred a research inclination towards conducting the WGS reaction at reduced temperatures. Nonetheless, the challenge of achieving efficient mass transfer between gaseous CO and liquid H2O at the photocatalytic interface under mild reaction conditions hinders the advancement of the photocatalytic WGS reaction. In this study, we introduce a gas–liquid–solid triphase photocatalytic WGS reaction system. This system facilitates swift transportation of gaseous CO to the photocatalyst's surface while ensuring a consistent water supply. Among various metal-loaded TiO2 photocatalysts, Rh/TiO2 nanoparticles positioned at the triphase interface demonstrated an impressive H2 production rate of 27.60 mmol g−1 h−1. This rate is roughly 2 and 10 times greater than that observed in the liquid–solid and gas–solid diphase systems. Additionally, finite element simulations indicate that the concentrations of CO and H2O at the gas–liquid–solid interface remain stable. This suggests that the triphase interface establishes a conducive microenvironment with sufficient CO and H2O supply to the surface of photocatalysts. These insights offer a foundational approach to enhance the interfacial mass transfer of gaseous CO and liquid H2O, thereby optimizing the photocatalytic WGS reaction's efficiency.
研究领域:
化学工程
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材料科学
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环境科学
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DOI
ATMOSPHERIC ENVIRONMENT
·
2026
·
IF 3.8
Jin Zhang,Jianze Zhang,Yifan Qiao,Xinxing Zhang,Yifan Meng
Direct capture of carbon dioxide (CO 2 ) by organic amines is often inefficient in bulk aqueous solutions under mild conditions, whereas microdroplets provide a unique gas-water interfacial environment that enables the transformation. However, whether CO 2 capture occurs from the gas side or the water side of the microdroplet interface remains unclear. Here we show that amines capture CO 2 predominantly on water microdroplets to form carbamates, suggesting that the gas–water interface plays a key role in this process. In the presence of dipropylamine vapor, spraying water microdroplets generates a carbamate anion which is directly detected by mass spectrometry (MS) and tandem mass spectrometry (MS 2 ). Control experiments show that removing dissolved CO 2 from water has little effect on product formation, whereas replacing the surrounding gaseous CO 2 with N 2 strongly suppresses the carbamate signal. These results indicate that CO 2 capture occurs predominantly from the gas side rather than from the water side of the gas–water interface. Comparison of vapor-phase amine and dissolved amine conditions shows that the carbamate formation occurs more readily when the amine is introduced from the gas side of the gas–water interface. Water microdroplets are also found to be more effective than other organic solvents, demonstrating that water provides a unique interfacial environment for efficient CO 2 -capture and stabilization of the product. Primary and secondary amines give analogous products, whereas a tertiary amine does not, further supporting carbamate formation. This work suggests a directional role of the gas–water interface in amine-mediated CO 2 capture and provides preliminary mechanistic insight into gas uptake at microscopic aqueous interfaces.
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JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Peng Wu,Yi Li,Song Xiao,Junyi Chen,Ju Tang,Dachang Chen,Xiaoxing Zhang
As a novel eco-friendly gas insulation medium, perfluoroisobutyronitrile (C 4 F 7 N) has been utilized in various gas insulated equipment. Considering the biological toxicity of C 4 F 7 N, it is of great engineering significance to develop highly sensitive sensors for leakage detection scenarios. Herein, we fabricated the first SnO 2 nanoparticles based highly sensitive C 4 F 7 N gas sensor that realized a superior response of 65.01% within 21 s for 50 ppm C 4 F 7 N exposure and a detection limit of 0.25 ppm. Meanwhile, successive response-recovery tests were performed to confirm its durability and stability. We also explored the sensing mechanism of SnO 2 nanoparticles towards C 4 F 7 N and explained the superior sensing performance compared with other gases based on the density functional theory . It was found that the O vacancy demonstrates strong interaction with the -CN group in C 4 F 7 N that promotes the detection response, which was also confirmed by sensing experiments for SnO 2 with different O vacancy density. We believe this paper provides convincing support for lowering the potential operation risk brought by C 4 F 7 N in electrical engineering and the application scenarios of SnO 2 based gas sensors.
研究领域:
材料科学
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电气工程
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环境科学
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高影响因子
ACS Omega
·
2026
·
IF 5.2
Jian Yan,Xuan Yang,Tianyi Wang,Qing Yang,Kai Qi,Meiqi Dang,Mingyao Li
To address the technical challenge of severe performance degradation of foaming agents caused by high-salinity formation water and condensate during drainage gas recovery in tight gas wells, this study developed a composite foam system (BLZP) with excellent salt and oil tolerance. Through chemical modification, zwitterionic groups (sulfonate and quaternary ammonium) were introduced into the poly(vinyl alcohol) (PVA) backbone to synthesize a zwitterionic polymer ZPVA, which served as a stabilizer. ZPVA was then optimized via orthogonal experiments with the zwitterionic primary foaming agent dodecyl dimethyl betaine (BS-12) and the nonionic cofoaming agent lauryl dimethyl amine oxide (LAO). Sodium perfluorononyloxybenzenesulfonate (OBS) was subsequently incorporated as an enhancer. Systematic characterization and evaluation demonstrated that ZPVA effectively suppresses polymer aggregation in 10 wt % NaCl or CaCl2 solutions, maintaining smaller hydrodynamic sizes and higher solution viscosities. The optimized BLZP system exhibited significantly enhanced interfacial dilatational viscoelasticity in simulated high-salinity formation water (TDS 78,050 mg/L). Oil-tolerance tests (with condensate content up to 60%) further revealed that BLZP, owing to its compact and highly elastic composite interfacial adsorption layer, effectively inhibits oil droplet spreading and bridging-induced foam rupture. The decrease in initial foam height (H0) and 5 min foam height (H5) was substantially lower than that of two commercial foaming agents. Even at 60% oil content, BLZP maintained H5 > 150 mm, liquid carrying ratio >40%, and foam water content >4%, demonstrating outstanding potential for field applications. This study provides an innovative chemical solution for efficient foam-assisted drainage gas recovery under challenging reservoir conditions.
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高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Yongfei Li,Yanling Wang,Qian Wang,Zhonghua Liu,Longhao Tang,Lei Liang,Chuanbao Zhang,Qiang Li,Ning Xu,Jinsheng Sun,Wenjing Shi
It is well-known that the production of gas-condensate reservoirs is significantly affected by the liquid condensation near the wellbore region. Gas-wetting alteration can be one of the most effective approaches to alleviate condensate accumulation and improve liquid distribution. However, gas well deliverability is still limited because the wettability of cores is altered only from liquid-wetting to intermediate gas-wetting by using traditional chemical stimulation. To solve this bottleneck problem, herein, we developed a fluorine-functionalized nanosilica to achieve super gas-wetting alteration, increasing the contact angles of water and n-hexadecane on the treated core surface from 23 and 0° to 157 and 145°, respectively. The surface free energy reduces rapidly from 67.97 to 0.23 mN/m. The super gas-wetting adsorption layer on the core surface formed by functionalized nanosilica not only increases the surface roughness but also reduces the surface free energy. The core flooding confirms that the required pressure for displacement is apparently reduced. Meanwhile, the core permeability can be dramatically restored after the super gas-wetting alteration. The microscopic visualization is employed to further understand the impact of fluorine-functionalized nanosilica on the fluid flow behavior and mechanism in porous media. The oil saturation in the micromodel decreases sharply from 48.75 to 7.84%, eliminating the “water locking effect” and “Jiamin effect”, which indicates that the added functional nanosilica effectively improves fluid flow capacity and may contribute to production in the gas condensate reservoirs. In addition, this work reveals the fluid flow behavior and mechanism in the reservoir in detail, which will expand the better application of this material to many oilfields and other mining engineering systems.
研究领域:
石油工程
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材料科学
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高影响因子
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