CARBON
·
2021
·
IF 9.594
Jian Liu,Xin Li,Lingie Zhang,Xiangyang Liu,Xu Wang
The transformation of graphene into sp 3 -bonded carbon films through ultra-high pressure, hydrogenation or fluorination has been studied for years. It is considered that only few layers of graphenes on metal surfaces can realize this transformation and the electron orbitals hybridization between metal substrate and graphene layer is thought to be the drving force and stabilize the formed sp 3 carbon structure. Here, we use nanographene molecule, hexa-peri-hexabenzocoronene (HBC), as the model compound to exploit the fluorination reaction between graphene and fluorine gas. MALDI-TOF mass, XPS and XRD results show that the direct fluorination realized the intermolecular cross-linking of nanographene molecules without the assistence of mental substrate. Combining with theoretical calculation and EPR test results, we proved that the fluorination of nanographene molecules with F 2 follows a free-radical mechanism, and the carbon radicals formed during fluorination caused the covalent cross-linking between graphene molecules which have a tight π-π stacking. Meanwhile, the fluorination of other small nanographene molecules, pyrene and perylene, further confirmed the universality of this free-radical cross-linking mechanism. This would provide a further understanding for the chemical transformation from graphene layers to 2D diamond structure under chemical adsorption process.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sensors
·
2020
·
IF 7.333
Hui Zhi,Jianmei Gao,Liang Feng
In this study, an innovative gas sensing mechanism, self-responsive sensing mechanism, has been detected in the supramolecular hydrogel-based sensors. The self-responsive ability of as-fabricated hydrogel-based sensors to the target gas (e.g., NO2, NH3, etc.) is determined by three synergetic supramolecular interactions, namely, hydrogen bonding, molecule crystallization, and electrostatic interactions existing in hydroxyls, poly(vinyl alcohol) (PVA) crystallization, and poly(ionic liquids) of the intrinsic hydrogel networks, respectively. On account of unique synergetic supramolecular interactions, the sensors not only exhibit a rapid, reversible, and reproducible response but also show good tensile and compressive properties and excellent recovery property. The results demonstrate the potential of the self-responsive sensing mechanism as a pathway to realize a new generation of highly responsive hydrogel-based gas sensors.
研究领域:
材料科学
·
化学传感器
·
超分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2020
·
IF 0
Qi Hu,Jiaqi He,Junyu Chang,Jianmei Gao,Jiahui Huang,Liang Feng
The accurate and rapid monitoring of triethylamine (TEA) is highly desired for human health, environmental protection, and food safety. Herein, we have fabricated a WO3 sample with a morphology of needle-shaped nanorods via a simple hydrothermal method and subsequent calcination. The WO3 needle-shaped nanorods with 5 μm length and 400 nm diameter possess a uniform and homogeneous morphology, which avails large-scale industrialization. The sensing based on needle-shaped WO3 nanorods exhibits an ultrasensitive response to TEA, with a response up to 6.7 toward 1 ppm TEA at 250 °C. The outstanding selectivity and repeatability are observed as well. The excellent sensing performance is tentatively attributed to the uniform and large-scale morphology, highly active C–N bonds in TEA, and the effective interaction between WO3 and TEA. Furthermore, the sensor is directly employed to monitor the TEA given off from a grass carp in 48 h, and a good linearity (R2 = 0.996) between the response and preserving time is obtained, proving its promising prospect in daily use. The architecture strategy opens an available route for large-scale practical fabrication of WO3 needle-shaped nanorods, and it is a pioneering attempt to apply the sensor for trace TEA detection in marine food safety testing.
研究领域:
材料科学
·
环境科学
·
传感器技术
✓ 已验证
产品关联
DOI
POLYMER
·
2022
·
IF 4.432
Junbo Yue,Jingjing Hou,Yixuan Li,Yanqin Yang,Lu Han,Shuzheng Sun,Jingde Li
Here we report the synthesis of branched Tröger's base polymers ( x -BTB) with different degree of tetraphenylmethane branch structure by incorporating varied amounts of tetrakis(4-aminopheny)methane into the main chains of Tröger's base polymer (TB). We show that branching increases porosity of x -BTB, leading to improved gas permeability . Specifically, the BET surface area and pore volume of x -BTB polymers increase continuously from 410 to 544 m 2 g −1 and 0.584–0.607 cm 3 g −1 , respectively, for branched polymers containing progressively more branch structure. For CO 2 /N 2 , CO 2 /CH 4 , and O 2 /N 2 binary gas separation, a significant improvement in the gas permeability without obvious compromising the membrane selectivity is observed on the x -BTB membranes with higher branch degree. In particular, for CO 2 /N 2 binary gas separation, the CO 2 permeability of 5 wt%-BTB membrane is 145 Barrers, creating an enhancement of 64.8% as compared to TB membrane. Moreover, x -BTB membranes are much more resistant to physical aging than TB membrane. These results suggest that introduction of tetraphenylmethane branch structure is an effective strategy to fabricate polymeric membranes with high performance suitable for gas separation applications.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2026
·Vol. 65
·期 28
·15176-15189
·
IF 3.9
Wu Zuhao,Wu Shengji,Han Zhongxi,Li Siyue,Wang Hui,Yin Haoyong,Liu Juanjuan,Zhou Jie
Cerium-based
composite oxides have been intensively investigated
for the elimination of elemental mercury (Hg 0 ) from natural
gas and flue gas. Because of distinct operational conditions, the
required types of active oxygen species in composite oxides differ
substantially between these two atmospheric environments. Nevertheless,
the diversity of oxygen species has led to considerable debate regarding
the active sites responsible for the Hg 0 removal. The exploration
of these oxygen species is essential as it directly guides the rational
design of active sites in sorbents. In this work, we designed and
synthesized sorbents with different oxygen species and systematically
investigated the contributions of these oxygen species in the Hg 0 removal reaction. Cu–Mn–Ce (CMC) composite
oxides were successfully prepared by the coprecipitation method. Characterization
results indicate that the incorporation of Cu and Mn ions into the
CeO 2 lattice indeed significantly increases the concentration
of oxygen vacancies and releasable lattice oxygen. The Hg 0 removal efficiencies of CMC for natural gas and flue gas can be
maintained above 90.0% and 99.0%, respectively, even under a high
gas hourly space velocity of 480,000 h –1 . Furthermore,
CMC exhibits superior cyclic stability and high SO 2 resistance
for Hg 0 removal. Combined with the results from adsorption
tests and characterization, it can be concluded that the surface-active
oxygen species determine the catalytic oxidation and adsorption efficiency
of Hg 0 , while the releasable lattice oxygen species ensure
the continuous supply of active oxygen under extremely oxygen-deficient
conditions.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Shun-Shun Chen,Zi-Yi Shen,Jin-Xuan Song,Ming Tang,Guo-Hui Jiang
The cross-interference of multiple gases and their unknown concentrations in mixed environments renders identifying and determining single-phase gas concentrations in mixed environments a challenge for chemical-resistant metal oxide gas sensors. In this study, a dynamic temperature modulation strategy is proposed, and the temperature-controlled sensitivity behavior of porous SnO 2 nanofibers embedded with Fe 2 O 3 hollow spheres (Fe 2 O 3 @SnO 2 ) as a gas sensor under different frequency modulations is explored. Based on differences in their characteristic curves, linear discriminant analysis was employed to extract features and reduce dimensions. Seven different volatile organic compounds were successfully identified and analyzed. Convolutional neural networks were used to identify certain characteristics and predict the concentrations of single-phase gases in mixed-gas environments. Using training and data validation, seven single-phase gases were successfully separated and identified, with an accuracy of 99.8% for n-butanol. Linear regression analysis was also performed on different gas targets, and the actual concentration was highly consistent with the predicted concentration, rendering the Fe 2 O 3 @SnO 2 gas sensors useful for quantitative analysis.
研究领域:
化学传感
·
纳米材料
·
气体检测
·
机器学习应用
·
环境监测
✓ 已验证
DOI
高影响因子
Polymers
·
2021
·Vol. 13
·期 22
·3962
·
IF 4.329
Abdul Shakoor Shar,Caili Zhang,Xieqing Song,Yunxuan Weng,Qiuyue Du
Polymer/clay composites are an innovative class of materials. In this study, we present a facile method for the preparation of biodegradable and robust PLA/organomodified montmorillonite (OMMT) composite films with excellent gas barrier performance. When the design of PLA/OMMT composite films, in addition to making OMMT have good intercalation effect in the matrix, the compatibility of intercalating polymer and matrix should also be considered. In this work, two polymers with high gas barrier properties, namely poly(vinyl alcohol) (PVA) and ethylene vinyl alcohol copolymer (EVOH), were selected to intercalate OMMT. The morphology and microstructures of the prepared PLA/PVA/OMMT and PLA/EVOH/OMMT composites were characterized by the X-ray diffraction measurement, scanning electron microscopy, and differential scanning calorimetry. It was shown that the good dispersibility of PVA in the PLA matrix, rather than the intercalation effect, was responsible for the improved gas barrier and mechanical properties of PLA/PVA/OMMT composite. The elongation at break increases from 4.5% to 22.7% when 1 wt % PVA is added to PLA/OMMT. Moreover, gas barrier of PLA/PVA1/OMMT measured as O2permeability is 52.8% higher than that of neat PLA. This work provides a route to intercalate OMMT interlayer with high gas barrier polymers and thus can be a useful reference to fabricate PLA/OMMT composites with improved gas barrier and mechanical properties. A comparison of oxygen permeabilities with existing commercial packaging films indicates that the biodegradable PLA/PVA/OMMT may serve as a viable substitute for packaging film applications.Keywords:poly(lactic acid);OMMT;gas barrier films;nanocomposites
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF FOOD SCIENCE AND TECHNOLOGY-MYSORE
·
2022
·Vol. 59
·期 10
·4108-4121
·
IF 3.117
Chen Jia-Nan,Han Hao-Ting,Liu Chun-Ju,Gao Qi,Wang Xiao-Wen,Zhang Jun-Wei,Tanokura Masaru,Xue You-Lin
Dongli , or frozen pear, is a traditional Chinese snack with a unique flavor. This study identified the aroma-active volatile compounds (VOCs) in Dongli using quantitative descriptive analysis (QDA), gas chromatography-triple quadrupole tandem mass spectrometry (GC-MS/MS), and gas chromatography-olfactometry (GC-O). QDA indicated that Dongli of all cultivars presented increased sweet and wine aromas. A total of 21 VOCs were identified by GC-MS/MS. Bidirectional orthogonal partial least square (O2PLS) analysis, GC-O analysis, detection frequency analysis (DFA), and relative odor activity values (ROAV) showed that: estragole and anethole contributing “anise, green” aromas were the key aromatic VOCs of fresh pears, while ethyl butanoate, butyl acetate, heptyl acetate, benzaldehyde, and geranyl acetone contributing “sweet, fruity, green” aromas were the key aromatic VOCs of Dongli . The results revealed that the repeated freezing treatment promoted a unique aroma in pears. This study would contribute to developing new pear products. Graphical abstract
研究领域:
食品科学
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植物学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NANOTECHNOLOGY
·
2023
·Vol. 34
·期 45
·455501
·
IF 3.5
Baoqing Han,Xinyu Zhang,Yan Wang,Wenjuan Wang,Benben Wang,Shuai Li,Hairong Wang,Yuefei Yan,Jiusheng Han,Chuanliu Wang,Congsi Wang
Isoprene is a typical physiological marker that can be used to screen for chronic liver disease. This work developed a portable micro-integrated chromatography analysis system based on micro-electromechanical system technology, nanomaterials technology and embedded microcontroller technology. The system integrated components such as graphene oxide quantum dots modified semi-packed microcolumn, In2O3 nanoflower (NF) gas-sensitive detector and 3D printed miniature solenoid valve group. The effectiveness of the separation effect of the micro-integrated system was verified by gas mixture test; the laws of the influence of carrier gas pressure and column temperature on the chromatographic separation performance, respectively, were investigated, and the working conditions (column temperature 90 °C and carrier gas pressure 7.5 kPa) for system testing were determined. The percentages of relative standard deviation of the peak areas and retention times obtained for the separated gases were in the range of 0.95%–6.06%, indicating the good reproducibility of the system. Meanwhile, the microintegrated system could detect isoprene down to 50 ppb at small injection volume (1 ml). The system response increased with increasing isoprene concentration and was linearly correlated with isoprene concentration (R2 = 0.986), indicating that the system was expected to be used for trace detection of isoprene, a marker gas for liver disease, in the future.
研究领域:
分析化学
·
生物医学工程
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yan-nan Wang,Jingfeng Li,Zhiqiang Yang,Zhenyu Yuan,Jin Li,Fanli Meng
In this study, a hollow malposition structure (HMS) optical fiber 2-butanone gas sensor based on double-layer WO 3 @CQDs porous film is proposed, and realizes the ppb detection of 2-butanone gas at room temperature. The HMS can excite the evanescent field and sense the gas adsorption on the fiber surface. The experimental results show sensitivity of 3.09 pm/ppm for this HMS optical fiber gas sensor based on double-layered WO 3 @CQDs porous film, which is 6.05 times higher than that of the sensor coated with single-layer WO 3 @CQDs porous film. In addition, a limit of detection (LOD) reaches 500 ppb. The response time is 11.7 s and the recovery time is 5.72 s. Density functional theory (DFT) results show that the modification of CQDs improves the adsorption capacity of WO 3 @CQDs for 2-butanone gas molecules and changes the refractive index of the material. The sensor has the advantages of small volume, high sensitivity and a low LOD, which is of great significance for the detection of trace 2-butanone gas.
研究领域:
材料科学
·
光学传感
·
气体检测
✓ 已验证
DOI
高影响因子
Science Bulletin
·
2024
·
IF 18.8
Gang Wang,Jingrui Li,Shumin Sun,Yuqi Yang,Zhihui Han,Zifan Pei,Liang Cheng
Excess intracellular H 2 S induces destructive mitochondrial toxicity, while overload of Zn 2+ results in cell pyroptosis and potentiates the tumor immunogenicity for immunotherapy. However, the precise delivery of both therapeutics remains a great challenge. Herein, an electrically activable ZnS nanochip for the controlled release of H 2 S and Zn 2+ was developed for enhanced gas-ionic-immunotherapy (GIIT). Under an electric field, a locality with particularly high concentrations of H 2 S and Zn 2+ was established by the voltage-controlled degradation of the ZnS nanoparticles (NPs). Consequently, the ZnS nanochip-mediated gas-ionic therapy (GIT) resulted in mitochondrial membrane potential depolarization, energy generation inhibition, and oxidative stress imbalance in tumor cells. Interestingly, the cyclic guanosine monophosphate-adenosine monophosphate synthase-stimulator of interferon genes (cGAS-STING) signaling pathway was activated due to the mitochondrial destruction. Moreover, the released Zn 2+ resulted in the increase of the intracellular Zn levels and cell pyroptosis, which enhanced the immunogenicity via the release of damage-associated molecular patterns (DAMPs). In vitro and in vivo studies revealed that the ZnS nanochip-based GIT effectively eliminated the tumors under an electric field and mobilized the cytotoxic T lymphocytes for immunotherapy. The combination with αCTLA-4 further promoted the adaptive immune response and inhibited tumor metastasis and long-term tumor recurrence. This work presented an electrically activable ZnS nanochip for combined immunotherapy, which might inspire the development of electric stimulation therapy.
研究领域:
癌症治疗
·
纳米技术
·
免疫学
·
细胞生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Ziying Jin,Zhihua Zhao,Guixin Jin,Zhigang Shao,Lan Wu
Prolonged exposure to ethanol gas in the air can have deleterious effects on the human respiratory system and even pose an explosion risk. Therefore, it is imperative to monitor the concentration of ethanol gas and reliably detect its presence. In this study, tungsten-doped indium oxide (W-In 2 O 3 ) nanocomposites were synthesized by a hydrothermal method and utilized in gas sensors. The microstructures and morphologies of the nanocomposites were examined using various analytical methods, and the results indicated that W-In 2 O 3 was successfully synthesized. For instance, at optimal temperatures (280 °C) the gas-sensitive characteristics of W-In 2 O 3 composites were examined in response to varying ethanol gas concentrations (1−100 ppm). In particular, the sensor with a doping concentration of 10 % provided the best performance, as compared to the pure In 2 O 3 sensor, and displayed the highest response to 100 ppm of ethanol (33.2). Furthermore, this response is approximately 1.5–2 times better than that of pure In 2 O 3 , and simultaneously, in a cyclic test, the sensors consisting of W-In 2 O 3 exhibited excellent selectivity, fast response, short recovery times (10 and 60 s, respectively), good repeatability, and stability. In particular, the shift in microcrystal size caused by W doping was responsible for the notable augmentation of the sensitivity to ethanol, suggesting that the sensor may have potential applications for the detection and monitoring of ethanol gas.
研究领域:
材料科学
·
传感器技术
·
环境监测
✓ 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）