JOURNAL OF MATERIALS SCIENCE
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2019
·Vol. 54
·期 22
·14055-14063
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IF 3.442
Wang Yu-Chong,Sun Zhong-Sen,Wang Su-Zhen,Wang Shu-Ying,Cai Sheng-Xun,Huang Xin-Yu,Li Ke,Chi Zong-Tao,Pan Shu-Di,Xie Wan-Feng
Metal oxide semiconductor sensors based on nanocrystalline In 2 O 3 and its composites are found to be very sensitive in detecting low-concentration (~ 5 ppm) gases such as ozone, nitrogen dioxide, formaldehyde and butane. Here, we successfully obtained fiber-shaped In 2 O 3 crystalline nanofibers via electrospun and calcination routes. The gas sensing properties of the In 2 O 3 nanofibers were studied by exposing them to the acetic acid vapor with different concentrations from 500 ppb to 2000 ppm at the optimum operating temperature (250 °C). The device possesses ultra-high response of 66.7 toward 2000 ppm acetic acid vapor, low response and recovery times of 25 s and 37 s (100 ppm), respectively, and significant selectivity to acetic acid at 100 ppm. In particular, the sensor based on In 2 O 3 nanofibers has very low detection limit and can reach 500 ppb. Therefore, the presented In 2 O 3 nanofiber sensor can be used in practice in acetic acid detection area in the future.
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JOURNAL OF CHROMATOGRAPHY A
·
2018
·
IF 3.716
Bowen Tian,Bin Zhao,Fei Feng,Fan Luo,Haimei Zhou,Xiaohong Ge,Wu Yanhong,Xinxin Li
In this paper, a novel embeded elliptic cylindrical posts (ECPs) with large surface area and wide effective width, which could support more stationary phase and decrease the pressure drop, is applied on the micro-fabricated gas chromatographic (μGC) column. Compared with μGC column with cylindrical posts (CPs), the surface area and effective width of μGC column with ECPs are increased by 29% and 30%. Separation experiments are performed under the same head pressure at column inlet: in experiments of separating mixture 1, the column efficiency of the μGC column with ECPs for C9 has a 76% improvement, and the separation resolution between C8 and C9 also has a 34% improvement; in experiments of separating mixture 2, seven kinds of analytes can be identified by the μGC column with ECPs less than ten minutes, while, only six kinds can be identified by the μGC column with CPs in almost the same time. In detail, the column efficiency of the μGC column with ECPs for toluene has a 129% improvement, and the separation resolution between benzene and toluene also has a 56.4% improvement. Hence, the μGC column with the inner structures of ECPs is a valid means to improve column efficiency and resolution in a lower pressure drop.
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ANALYTICAL CHEMISTRY
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2018
·
IF 6.042
Jingni Fu,Luning Zhang
A fluorescence spectroscopic assay using Newton black film (NBF) for sensitive and selective detection of gaseous formaldehyde at room temperature is reported. The method relies on the Hantzsch reaction of formaldehyde with ammonium citrate and acetylacetone, plus a combination of the large surface area-to-volume ratio (5 × 108 m–1) and efficient uptake of gas by the nanometer-thick aqueous core of NBF. The assay has a limit of detection (LOD) of 4 ppb, a linear signal-to-concentration correlation up to 300 ppb of HCHO gas in the air, and a nonlinear monotonic increasing correlation in the range of 300 ppb to 1.2 ppm. It is unaffected by relevant analytes such as acetaldehyde, benzaldehyde, acetone, and propionaldehyde. We also demonstrate the sensing of formaldehyde outgassing from a plywood sample using this method and the results agree with the factory specifications.
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Royal Society Open Science
·
2019
·Vol. 6
·期 3
·
IF 2.515
Zhanyang Gao,Min Wang,Shiyao Wang,Yi Wang,Ruichao Peng,Ping Yu,Yunbai Luo
A novel and efficient preparation route of insulating gas-heptafluoroisobutyronitrile was developed. The synthetic route involved halogen-exchange fluorination, decomposition of bis-(perfluoroisopropyl) ketone and dehydration reaction. Overall, the desired compound was produced without the use of extremely toxic and expensive substances. Structures of the as-obtained products were determined by 19F NMR, 13C NMR, IR and GC-MS. The effects of several variables on reaction yield including nature of potassium fluoride, the catalyst dosage, temperature, solvent and molar ratio of raw materials were all investigated. The results indicated that the total yield of heptafluoroisobutyronitrile could reach 42% from original materials under optimal conditions and the mechanism of the reaction was proposed.
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ACS Omega
·
2025
·
IF 4.3
Xiaoyu Chen,Cong Chen,Yutong Liu,Kun Tang,Mengqi Chen,Jianhua Qiu,Lin Yuan,Hongtao Shen,Zhiyong Wu
In order to investigate characterization and the differences of volatile substances in different types of flue-cured tobacco, the volatile components (VOCs) and relative contents of six varieties of flue-cured tobacco were analyzed by headspace gas chromatography–ion mobility spectrometry (HS-GC-IMS) and headspace solid-phase microextraction–gas chromatography–mass spectrometry (HS-SPME-GC-MS). Combined with the relative odor activity value (ROAV), important flavor substances were determined and different aroma components were screened by multivariate statistical analysis. The results showed that 93 and 80 kinds of compounds, such as esters, alcohols, and aldehydes, were detected by GC-IMS and HS-SPME-GC-MS in six flue-cured tobacco varieties, respectively. A total of 19 volatile flavor compounds, such as benzaldehyde, acetic acid, valeraldehyde, and methyl acetate, were selected as compounds to distinguish the aroma of different toasted tobaccos by orthogonal partial least-squares discrimination analysis (OPLS-DA). In this study, more comprehensive information about volatile flavor components of six flavor types of flue-cured tobacco has been obtained by the synergistic analysis of two distinct analytical instruments. Meanwhile, this study clarified the composition and differences of aroma components of six types of flue-cured tobacco, which lays a foundation for the flavor control of different types of flue-cured tobacco.
研究领域:
烟草科学
·
分析化学
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SURFACE & COATINGS TECHNOLOGY
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2025
·
IF 6.1
Lang Guo,Liqin Wang,Siyu Zhang,Lebin Wang,Zeduan Pan,Xin Leng,Zhuang Ma,Xing Zhao
Corrosive solutions and gases are the most critical factors in the corrosion of metal artefacts. Preventing both electrolyte and gas corrosion without altering the appearance remains a challenge. In this paper, a superhydrophobic coating BTA-B72-FSiO 2 was prepared by stepwise treatments using benzotriazole (BTA), Paraloid B72 (B72) and fluorinated SiO 2 (FSiO 2 ) materials. The coating resulted in a colour difference of only 2.01 and no significant bleaching, in line with the requirements for artefact treatment. With a punctiform, rough structure, the surface exhibited superhydrophobic, anti-adhesive, anti-fouling and self-cleaning properties. The electrochemical corrosion current of the coated bronze was three orders of magnitude lower than that of the untreated substrate, and the impedance modulus at 0.1 Hz was four orders of magnitude higher than that of the untreated substrate. The coating showed no significant corrosion after one hour of immersion in HCl solution at pH = 1. The coating had excellent corrosion resistance due to the insulation of the corrosive electrolyte by air pockets on the FSiO 2 surface. Furthermore, the coated bronze substrate did not corrode significantly in the corrosive gas environment for 18 d. The inner B72 film provided a barrier to corrosive gases, making the coating resistant to gas corrosion. Finally, the synergistic effect of FSiO 2 and B72 provided dual protection against corrosive electrolytes and gases. This coating is expected to offer a new way of protecting metal artefacts in complex environments.
研究领域:
文化遗产保护
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材料科学
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腐蚀工程
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表面化学
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Advanced Materials Technologies
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2025
·
IF 6.2
Mathankumar Ganesan,Jin Li,Tongheng Cheng,Fei Wang
Pyrochlore-based metal oxide nanocomposites offer an attractive pathway for developing next-generation gas sensors by exploiting interfacial charge transfer and band engineering. Here, we report for the first time the use of Ce 2 Sn 2 O 7 /TiO 2 nanocomposites for ultra-trace NH 3 detection at room temperature. The materials are synthesized via a facile hydrothermal route and systematically evaluated against common volatile organic compounds, including ethanol, acetone, methanol, n-butanol, isopropanol, and triethanolamine. The Ce 2 Sn 2 O 7 /TiO 2 heterojunction demonstrated outstanding selectivity toward NH 3 , with the optimized CeTi2 sensor delivering an ultrahigh response of 83.8% to 100 ppm, a rapid response time of 12 and 5 s, and an exceptionally low detection limit of 2 ppb under ambient conditions (25°C). At 100°C, the prepared CeTi2 sensor displays a gas sensing response of 82.1% towards 100 ppm of NH 3 . Beyond sensitivity, the device exhibited excellent repeatability and long-term stability, and ensured reliable operation under realistic environments. Mechanistic analysis revealed that the Ce 2 Sn 2 O 7 /TiO 2 interface induces strong surface band bending and remarkably accelerates charge transport and reversible adsorption–desorption dynamics. This work establishes Ce 2 Sn 2 O 7 /TiO 2 as a pioneering platform for ppt-level NH 3 detection, offering a powerful combination of selectivity, stability, and energy-efficient operation for environmental monitoring and industrial safety.
研究领域:
材料科学
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气体传感技术
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纳米材料
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环境监测
·
微机电系统（MEMS）
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JOURNAL OF CHROMATOGRAPHY A
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2019
·
IF 3.858
Lining Yu,Jun He,Meiling Qi,Xuebin Huang
This work reports a new type of triptycene-based amphiphilic stationary phase (TP-2IL) for gas chromatography (GC). It is an integration of the 3D π-rich triptycene framework with ionic liquids. Its capillary column showed the efficiency of 3880 plates/m determined by n -dodecane at 120 °C (k = 2.79) and exhibited good performance for analytes from apolar to polar nature. Particularly, it has outstanding capability for resolving critical pairs of anilines and phenols with good peak shapes and shows distinct advantages over its composing counterparts (TP-2BO and O-IL) and widely-used commercial columns, namely 35% phenyl methyl polysiloxane (DB-35) and polyethylene glycol (INNOWAX). Moreover, the TP-2IL column exhibited good repeatability and reproducibility with the values of relative standard deviation in the range of 0.02%–0.07% for run-to-run, 0.10%–0.35% for day-to-day and 2.9%–5.1% for column-to-column, respectively, and good thermal stability up to 300 °C. Furthermore, its applications for determining isomer impurities in real samples demonstrate its feasibility for practical GC analysis. This work presents a facile strategy for constructing triptycene-based stationary phases with amphiphilic selectivity and provides alternatives of highly selective stationary phases for chromatographic analysis.
研究领域:
分析化学
·
材料科学
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ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Danke Chen,Wen Ying,Yi Guo,Yulong Ying,Xinsheng Peng
Two-dimensional (2D) materials-based membranes show great potential for gas separation. Herein an ionic liquid, 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM][BF4]), was confined in the 2D channels of MoS2-laminated membranes via an infiltration process. Compared with the corresponding bulk [BMIM][BF4], nanoconfined [BMIM][BF4] shows an obvious incremental increase in freezing point and a shift of vibration bands. The resulting MoS2-supported ionic liquid membrane (MoS2 SILM) exhibits excellent CO2 separation performance with high CO2 permeance (47.88 GPU) and superb selectivity for CO2/N2 (131.42), CO2/CH4 (43.52), and CO2/H2 (14.95), which is much better than that of neat [BMIM][BF4] and [BMIM][BF4]-based membranes. The outstanding performance of MoS2 SILMs is attributed to the nanoconfined [BMIM][BF4], which enables fast transport of CO2. Long-term operation also reveals the durability and stability of the prepared MoS2 SILMs. The method of confining ILs in the 2D nanochannels of 2D materials may pave a new way for CO2 capture and separation.
研究领域:
材料科学
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化学工程
·
环境科学
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ACS Applied Nano Materials
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2019
·
IF 0
Zi-Meng Wang,Yuan-Yuan Cui,Cheng-Xiong Yang,Xiu-Ping Yan
Porous organic nanocages (POCs) have received great concern in diverse areas recently. However, a long reaction time as well as a toxic catalyst or solvents are still used to synthesize POCs, which may limit their broad applications. In addition, the synthesis of modified POCs will largely promote and expand their applications. Here we report a rapid, green, and catalyst-free method to synthesize model nano-POC CC3R and modified CC3S to tune their selectivity and to expand their applications in chiral gas chromatographic (GC) separation of many challengeable chiral alcohols. The nanosized CC3R is successfully synthesized via an ethanolic refluxing method within 4 h without any toxic catalyst or inert gas protection. The prepared CC3R coated capillary column provides good resolution and selectivity to diverse chiral alcohols. The mirrored CC3S and hydroxyl-modified CC3R–OH are also designed and synthesized via the ethanolic refluxing method to tune their selectivity and resolution for chiral alcohols. The introduction of hydroxyl groups into CC3R–OH nanocages largely enhanced their hydrogen-bonding forces to chiral alcohols, leading to the improved resolution and selectivity for chiral alcohols, which revealed the promise of modified POCs in chiral separation. This work may promote the synthesis, modification, and chiral chromatographic application of POCs.
研究领域:
材料科学
·
分析化学
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Nature Communications
·
2026
·
IF 18.1
Zhang Xinjing,Feng Qiuxia,Zhang Liming,Cao Zhongwei,Li Hongbo,Zhu Xuefeng,Yang Weishen
Membrane materials and fabrication methods often need to be co-developed to meet the specific permeance and selectivity requirements of different gas separation application, which limits the adaptability of membrane technology. Here we propose a post-regulation strategy—adjusting the pore structures of a standard “primitive” membrane to meet various separation needs—that greatly simplifies membrane preparation and accelerates technological advancement. Graphene quantum dots (GQDs) are introduced as innovative building blocks: a continuous GQD membrane is constructed by tightly stacking GQDs, and then its pore structure is tuned via heat treatment and in-situ cross-linking with small amine molecules. Combining adjustable angstrom-scale pores with preferential CO 2 adsorption, the resulting GQD membranes exhibit widely tunable CO 2 /N 2 and CO 2 /CH 4 separation performances. The CO 2 permeance and separation factors surpass most reported membranes and can be tuned to exceed industrial targets for CO 2 capture. By varying the heat treatment temperature, the separation scope of the membrane is further extended to challenging gas pairs such as C 3 H 6 /C 3 H 8 , demonstrating the high potential of this customizable post-regulation pore structure strategy.
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CERAMICS INTERNATIONAL
·
2026
·
IF 6
Lei Dong
Although porous ceramics with well-defined submicron pores have garnered research interest, controlling porosity remains challenging. In this study, porous corundum was successfully prepared via a compacting–hydration approach, wherein ρ-Al 2 O 3 was molded, hydrated to homogenize the structure, and finally heat-treated. After hydrophobic modification with methyltrimethoxysilane, the prepared porous corundum was used for active gas capture and transport from water via a diving–floating mechanism. The evolution of crystal phases and microstructures was systematically investigated from room temperature up to 1600 °C. The prepared porous corundum exhibited tunable pore sizes from 151.1 nm to 484.7 nm, which could be controlled by the sintering temperature. The pore size of the corundum is much smaller than that of polymer foams or metal meshes (typically larger than 100 μm) currently used for underwater bubble collection applications, thereby enhancing the material's liquid entry pressure. This work demonstrates that the proposed method for the preparation of porous corundum with controllable submicron pores has potential applications in underwater gas collection.
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