SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Chengyu Zheng,Qin'an Zhou,Jun Wang,Dongdong Du
Plants are susceptible to biotic and abiotic stresses, they always make morphologic and metabonomic responses for self-preservation. The volatile organic compounds (VOCs) emissions generally change significantly in the face of different external stresses. In this study, an Au interdigital electrode (IDE) chemiresistor was induced to monitor the α-pinene vapor generated from Platycladus orientalis plants in real time to determine its external stress. The composite material of polyethylene-co-vinyl acetate (PEVA)/multi-walled carbon nanotube (MWCNT) was used as the sensitive film. The sensing material showed good selectivity and sensitivity (8.32 kΩ/ppm) with the detection limit of at least 0.5 ppm, and it was hardly affected by the relative humidity . In an actual test on the P. orientalis branch, the sensor resistance got about 15% increase to 4 mm-wide bark damage and 2% increase to 40-day water stress. The near field communication (NFC) tag was integrated with the Au IDE chemiresistor, which was used as a wireless and passive switch for plant stress monitoring. This study indicated that our developed α-pinene gas sensor worked steadily in laboratory tests, and it had the potential for wireless plant stress monitoring in the field.
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International Journal of Green Energy
·
2023
·
IF 3.3
Yuhang Fan,Changxin Liu,Kaiyuan Zhao,Tong Shao,Ruoshui Chen,Yilin Pan,Zhijian Liu,Xinxiang Pan
Harmful gas leakage often occurs in the engine room of ocean-going ships. Among these harmful gases, NO2 gas accounts for a high proportion. Generally, sensors for detecting NO2 gas in the machinery space have problems such as small detection range, poor sensitivity, and poor stability. Therefore, we present a novel self-powered sensing prototype using electronic printing. This prototype consists of a flexible thermoelectric film and a flexible gas sensor. At 80K temperature difference, the maximum output voltage and power of the prototype reached 102.5 mv and 64.5μw, respectively. The prototype can charge the supercapacitor (5.5 V, 0.47uF) to 5.5 v in 10 minutes. The sensitivity, selectivity and repeatability of gas sensor in different concentration gas environment were studied. The results show that in the range of 20 -100 ppm, the detection current of NO2 concentration curve is approximately linear. The prototype has good stability and repeatability. After 1,000 flexibility tests, the prototype still has high flexibility. After connecting the boost circuit, the prototype can drive the single chip microcomputer to realize the self-power supply and danger. This study provides a new way for the monitoring of harmful gases in the ship engine rooms.
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CHEMISTRY & BIODIVERSITY
·
2023
·Vol. 20
·期 8
·e202300350
·
IF 2.9
Mengyi Ba,Ruonan Chen,Qiuchen Huang,Yanli Song,Wen Li,Yuanyuan Zhang,Haixin Liu,Xiang Xu,Weidong Zhang,Zhiqiang Cai,Tao Sun
This work firstly reported a new polycaprolactone based material functionalized with guanidinium ionic liquid (PCL-GIL) as the stationary phase with high resolution performance for capillary gas chromatography (GC). It is composed of polycaprolactone (PCL) and guanidinium ionic liquid (GIL) with amphiphilic conformation. The PCL-GIL capillary column coated by static method exhibited high column efficiency of 3942 plates/m and moderate polarity. As a result, the PCL-GIL column exhibited high-resolution capability. For a mixture of 27 analytes with a wide ranging polarity and outperformed the PCL-2OH and HP-35 columns, showing its advantageous separation capability for analytes of diverse types. Moreover, the PCL-GIL column showed high resolving capability for various positional isomers and cis-/trans- isomers, including alkylbenzenes, chlorobenzenes, naphthalenes, bromonitrobenzenes, chloronitrobenzenes, benzaldehydes, phenols, alcohols, respectively. In a word, PCL derivatized by GIL units as a new type of stationary phase has a promising future in GC separations. Graphical
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高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 34
·11897-11903
·
IF 4
Ying Liu,Baoteng Li,Sailong Xu,Ying Guo
In this paper, highly dispersed hierarchical coral spheres of CeO2/ZnO have been constructed through a facile template-free hydrothermal strategy, followed by an annealing treatment. The resulting coral spheres exhibit enhanced activity for acetone sensing compared with CeO2 or ZnO as well as excellent cyclability and long-term stability. At the optimum working temperature of 245 °C, by controlling the ratio of Ce/Zn, the highest response of the coral spheres towards 100 ppm acetone is up to 145, which is about 5.5 times that of ZnO coral spheres. The significantly improved gas sensing activity may be ascribed to the well-dispersed and assembled CeO2 nanoparticles on the surface of ZnO coral spheres and the heterojunctions between CeO2 and ZnO, which produced abundant oxygen vacancies in the CeO2/ZnO coral spheres.
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CONSTRUCTION AND BUILDING MATERIALS
·
2023
·
IF 7.4
Jingxuan Cai,Jinghong Zhou,Cheng Liu,Kaiyuan Mei,Chunmei Zhang,Xiaowei Cheng
To cement natural gas hydrate (NGH) layers in the deep and ultra-deep water environment, cement slurries must display both low heat of hydration (HOH) and high early strength. Herein, chemical precipitation was used to prepare a microencapsulated phase change material (MPCM) comprising a core of phase change materials and a shell of silica. The MPCM could effectively control the temperature increase during cement hydration and improve the early strength of cement pastes by accelerating hardening. Comprehensive physical and chemical analyses were carried out to identify a suitable ratio of MPCM and its underlying mechanisms. A laboratory device was further used to test the effect of MPCM-cement composite slurries on the thermal stability of NGHs. The properties of this new cement slurry system meet the requirements for cementing NGH layers in deep and ultra-deep water areas. This cement composite has broad application potential in the oil and natural gas industry.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Shuai Wang,Chunliang Shang,Yimin Deng,Jan Baeyens,Tatiana V. Plisko,Alexandr V. Bildyukevich,Tejraj M Aminabhavi,Xinying Liu,Mahluli Moyo,Helei Liu
The mass transfer plays a decisive role in screening and evaluation of amine solvents as well as in designing and scale-up of CO 2 capture. The influence of different operating parameters on mass transfer processes in CO 2 capture by EAE-1DMA2P amine solution was thoroughly investigated using a small-scale packed column. The mass transfer mechanism of EAE-1DMA2P amine solution in the capture of CO 2 was discussed by determining both mass transfer control steps and the reaction region between CO 2 and amine solvent, which provided a theoretical guidance for subsequent development of new solvents for large-scale applications. In addition, based on the experimental observations of K G a v , a prediction model for K G a v of EAE-1DMA2P composite amine solution was established by comparing two empirical models viz., Kohl-Riesenfeld-Astarita and Sheng of which Kohl-Riesenfeld-Astarita model provided a better fitting of the experimental results. The commonly used amine solvents and EAE-1DMA2P composite solvents were further compared and analyzed in terms of packed column size design and solvent consumption. The required packed column volume using EAE-1DMA2P composite solvent was only 4.95 m 3 , while the EAE-1DMA2P composite solvent has the smallest solvent consumption among all the solvents, indicating that this solvent has a lower operating cost than the other solvents, suggesting better industrial application.
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POWDER TECHNOLOGY
·
2023
·
IF 5.2
Fupeng He,Jianbo Zhao,Qingqing Hu,Yongjie Liu,Qingyun Huang,Zhixiong You,Xuewei Lv
We investigate the isothermal kinetics of the reduction and nitridation of V 2 O 3 using NH 3 . The reaction mechanism is also discussed based on the thermodynamic and experimental results. The reaction procedure between V 2 O 3 and NH 3 can be divided into two stages. The first stage is mainly the deoxygenation process, whereas the second is the nitridation process. The deoxygenation process follows a two-dimensional phase boundary reaction model, and a modified integrated model (IM + diffusion) was proved to be the best function at temperatures above 1023 K. For the second stage, the three-dimensional diffusion model is determined as the mechanism function. Thermodynamic analysis predicts the feasibility between V 2 O 3 and NH 3 to form VN . The VN product is a solid solution (VN x O y ) (0 < x,y < 1, x + y = 1), which can be formed at 873 K. The Rietveld refinement analysis indicates the N content of VN x O y gradually increases with increasing temperature. The highest N content is approximately 15.83% at 1073 K for 2 h.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Mengying Xu,Pier-Luc Tremblay,Tian Zhang
A heterojunction metal oxide semiconductor made of three phases of bismuth molybdate (BMO) (α, β, γ) was synthesized by a one-pot process from a metal–organic framework (MOF) and evaluated in a side-heated sensor for the detection of the toxic gas triethylamine (TEA). An X-ray diffraction analysis indicated that the heterostructure comprises 24.1% α-Bi2Mo3O12, 59.1% β-Bi2Mo2O9, and 16.8% γ-Bi2MoO6. Because of the collapse of the MOF structure during the synthesis process, BMO nanorods exhibited surface defects beneficial for gas sensing. Consequently, the TEA sensing performance of αβγ-BMOMOF was significantly superior to αβγ-BMO prepared instead with uncoordinated bismuth nitrate. When compared to single-phase α-Bi2Mo3O12MOF and γ-Bi2MoO6MOF sensors, the αβγ-BMOMOF heterojunction sensor exhibited high performance with a limit of detection of 0.5 ppm and a response value of 58.5 to 100 ppm TEA at an optimal temperature of 340 °C. In addition, αβγ-BMOMOF nanorods exhibited excellent selectivity, long-term stability, and short response and recovery times of 2 and 5 s, respectively. Because of heterojunctions between the different phases, the αβγ-BMOMOF sensor had a higher electrical resistance in air and adsorbed a larger quantity of oxygen anions capable of reacting with TEA. These features of the heterostructure material explain its superior TEA sensing performance. The low-cost and low-toxicity αβγ-BMOMOF sensor described here is a promising alternative for the detection of volatile organic molecules.
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Chemosensors
·
2023
·Vol. 11
·期 7
·370
·
IF 4.2
Futong Tian,Guoxing Ma,Xing Zhao,Jie Gao,Jingwen Zhang,Hui Suo,Chun Zhao
For semiconductor tin dioxide (SnO2) materials, the oxygen adsorption theory often struggles to explain their selectivity towards specific gases. Therefore, it is worth considering altering the surface functional groups of SnO2to modify its surface state and enhance its selectivity towards specific gases. Due to the rich functional groups on the surfaces of carbon dots, this study employed a hydrothermal method to prepare three types of carbon dots with varying carboxyl functional group contents by adjusting the hydrothermal time. These carbon dots were then used as dopants and combined with SnO2to create composite gas-sensitive devices. The gas-sensing test results indicate that the introduction of carboxyl functional groups can enhance the selectivity of SnO2towards ethanol. Furthermore, at any operating temperature within the range of 150–300 °C, the higher the carboxyl functional group content on the surface of carbon dot-doped SnO2, the higher the sensitivity towards ethanol. By employing density functional theory (DFT), the interaction energies between the surfaces of carbon dots and surface carboxyl groups with the target gas were calculated. These calculations validated the gas-sensing test results, confirming that the presence of carboxyl functional groups enhances the selectivity towards ethanol. The results of this study can provide new insights into the research on the selective mechanism of gas-sensitive materials.Keywords:metal oxide semiconductor;carbon dots;gas sensors;carboxyl functional group;ethanol
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Xianglei Cao,Changyan Guo,Liugen Zhang,Meng Wang,Jia Guo,Yanfang Ma,Tingxiang Chen,Jide Wang
Photocatalytic alcohols decomposition is of great significance for the preparation of hydrogen and alcohol derivatives. Among which, the improvement of the hydrogen purity is very important for the later utilization. In this study, the photocatalytic gas-liquid products and formation rules/paths with C1-3 alcohols as substrates were summarized, and the reaction mechanisms were inferred based on the cycle experimental data and DFT calculation. For gaseous products, CH 4 , CO, C 2 H 4 or C 2 H 6 were also detected during the photocatalyzed alcohols decomposition in addition to hydrogen. The hydrogen yield from photocatalytic decomposition of isopropyl alcohol reached 65.98 mmol/g within 6 h, and it was proved to be the best substrate for hydrogen production due to the lowest CO content. For liquid products, the selectivity of acetal produced from ethanol can up to 99%. This work could facilitate the development of photocatalytic alcohol decomposition to produce higher purity hydrogen coupled with higher value-added liquid products.
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FUEL
·
2022
·
IF 8.035
Xinyu Yang,Zezhi Chen,Huijuan Gong,Feng Lin,Tingting Zhu,Ziyi Yang
Deoxygen is a crucial step for landfill gas (LFG) recycling and purification. Pt/γ-Al 2 O 3 is the most active catalyst for LFG deoxygen via catalytic methane oxidation . It is challenging but significant to further improve the performance of this type of catalyst. In regard of homogeneous and heterogeneous activation of methane by superacids , here we demonstrate LFG deoxygen via catalytic methane oxidation using a solid superacid catalyst, Pt/SO 4 2- /Al 2 O 3 , synthesized using pre-sulfated γ-Al 2 O 3 support by impregnated with sulfuric acid . In comparison to Pt/γ-Al 2 O 3 , Pt/SO 4 2- /Al 2 O 3 catalysts exhibit exceptionally improved activity and minimum complete O 2 conversion at a temperature of 264 ℃, a decrease of about 51 ℃. This value is superior to the state-of-the-art Pt-based deoxygen catalysts. Characterizations and theoretical calculations indicate that sulfation enhances the amount of acid sites on γ-Al 2 O 3 support and induces electron deficiency of the supported Pt species (+0.28|e|), thus boosting the low-temperature activity. Furthermore, the Pt/SO 4 2- /Al 2 O 3 catalyst maintained its initial activity after six runs without any detectable coke deposition. This discovery offers simple and effective strategies to precisely design higher performance application-oriented Pt based deoxygen catalysts.
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Small
·
2022
·Vol. 18
·期 40
·2204244
·
IF 15.153
Yayao Li,Yongchun Pan,Chao Chen,Zekun Li,Shiyu Du,Xiaowei Luan,Yanfeng Gao,Xin Han,Yujun Song
As a promising therapeutic modality targeting cancer, gas therapy still faces critical challenges, especially in enhancing therapeutic efficacy and avoiding gas poisoning risks. Here, a pH/glutathione (GSH) dual stimuli-responsive CRISPR/Cas9 gene-editing nanoplatform combined with calcium-enhanced CO gas therapy for precise anticancer therapy, is established. In the tumor microenvironment (TME), the fast biodegradation of the CaCO 3 layer via pH-induced hydrolyzation allows glucose oxidase (GO x ) to catalyze glucose for H 2 O 2 production, which further reacts with manganese carbonyl (MnCO) and achieves the precise release of CO gas. Simultaneously, in situ Ca 2+ overload from CaCO 3 degradation disturbs mitochondrial Ca 2+ homeostasis, resulting in Ca 2+ -driven reactive oxygen species (ROS) formation and subsequent mitochondrial apoptosis signaling pathway activation. Subsequently, by GSH-induced cleavage of a disulfide bond, the released Cas9/sgRNA (RNP) can achieve nuclear factor E2-related factor 2 (Nrf2) gene ablation to sensitize gas therapy by interfering with ROS signaling. This therapeutic modality endows codelivery of CRISPR, ions, and gas with smart control features, which demonstrates great potential for future clinical applications in precise nanomedicine.
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