TALANTA
·
2026
·
IF 6.1
Chu Zeng,Hong-Tao Jiang,Ming Xu,Zhi-Yuan Gu
Flexible metal–organic frameworks (MOFs) with dynamic adaptability offered exciting opportunities for advanced separation, yet their tendency to undergo void collapse severely limited their application as gas chromatography (GC) stationary phases. Here, we overcame this challenge by stabilizing the scu -topology Zr-MOF NU-903 through a linker installation strategy. By incorporating biphenyl-4,4′-dicarboxylic acid (BPDC) into the vacant coordination pockets along the c-axis, the resulting material, NU-903-BPDC, exhibited markedly enhanced stability and structural rigidity, retaining its porosity even at 250 °C. Comprehensive characterization confirmed that the original structure was preserved, while framework flexibility was effectively suppressed. Fluorescence spectroscopy further revealed restricted ligand dynamics, corroborating the rigidified framework environment. When employed as a GC stationary phase, NU-903-BPDC delivered significantly improved resolution for C 7 hydrocarbons and dichlorobenzene isomers, benefitting from stronger thermodynamic interactions and reduced band broadening. Crucially, NU-903-BPDC maintained stable separation performance after thermal treatment, in sharp contrast to the pronounced degradation observed for pristine NU-903. This work demonstrated linker installation as an effective strategy to modulate framework flexibility, opening a general pathway toward robust, high-performance MOF-based stationary phases for chromatographic separations.
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产品关联
DOI
PubMed
高影响因子
ACS Applied Polymer Materials
·
2026
·
IF 4.7
Ruishu Kang,Peng Shan,Jian Du,Chao Li,Xiaodong Xia,Junchen Luo,Dong Lv,Yehan Tao,Jinwen Hu,Chenglong Fu,Haisong Wang
The design of efficient adsorption sites within triboelectric materials is crucial for improving the atmospheric response sensitivity and operational performance of triboelectric nanogenerators (TENGs). In this work, zeolitic imidazolate framework-67 (ZIF-67) was synthesized using sodium lignosulfonate (SLS) as a polymeric soft template (ZIF-67@SLS) and subsequently incorporated as a nanofiller with abundant adsorption sites into sodium carboxymethyl cellulose (CMC) and poly(vinyl alcohol) (PVA) matrices. The resulting flexible TENG exhibits a rapid and sensitive response to ammonia. The ZIF-67@SLS features a high specific surface area and dense active sites, which enhance ammonia molecule adsorption. The lone-pair electrons of ammonia neutralize surface charges on the TENG, altering the surface electron density and leading to a reduced output voltage. A clear concentration-dependent voltage drop is observed as the ammonia levels increase. Due to the high specific surface area and high triboelectric output performance, we used CMC/PVA/ZIF-67@0.1SLS (CPZS0.1) composite film for ammonia sensing performance evaluation. Compared to pristine ZIF-67, the CPZS0.1-based TENG shows a 41.67% reduction in response time (42 s vs 72 s) and a 58.81% increase in sensitivity (0.539 V/ppm vs 0.222 V/ppm) within the 0–180 ppm range. The optimized system enables accurate ammonia detection and effective monitoring of meat freshness in packaging applications. This study offers a promising strategy for constructing cellulose-based triboelectric composites with tailored gas-responsive behavior, advancing the development of smart sensing materials for environmental and food safety monitoring.
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产品关联
DOI
高影响因子
POLYMER
·
2026
·
IF 4.5
Yuxin Song,Rong Guo,Jianming Zhong,Xu Zhang,Fuchang Shu,Yongbing Zhuang
Polyimides are widely utilized in functional applications such as gas separation membranes, owing to their outstanding properties. However, the influence of repeat unit sequences on physical and gas transport properties remains insufficiently explored. In this work, three imide-containing diamines, Diamine N, Diamine B, and Diamine 1, were synthesized by reacting 2,5-dimethyl-1,4-phenylenediamine (DPD) with 1,4,5,8-naphthalenetetracarboxylic dianhydride (NTCDA), 4,4′-(4,4′-isopropylidenediphenoxy)bis(phthalic anhydride) (BPADA), and 4,4′-(hexafluoroisopropylidene)diphthalic anhydride (6FDA), respectively. Subsequently, alternating copolymers NT6F-A and BP6F-A were prepared from Diamine N or Diamine B with 6FDA, while BPBT-A and 6FBT-A were obtained from Diamine B or Diamine 1 with 3,3′,4,4′-benzophenonetetracarboxylic dianhydride (BTDA). For comparative evaluation, four corresponding random copolymers (NT6F-R, BP6F-R, BPBT-R, and 6FBT-R) were also synthesized under identical conditions. The effects of repeat unit sequencing on the copolyimides’ physical and gas transport properties were systematically investigated. Compared to their random analogs, alternating copolymers exhibited more ordered and dense chain packing that imparts higher diffusion selectivity, thereby substantially enhancing membrane gas separation selectivity. And the alternating copolymer 6FBT-A in particular demonstrated superior solubility, mechanical properties and thermal conductivity relative to its random counterpart 6FBT-R. Specifically, 6FBT-A exhibited tensile strength and modulus of 98.9 MPa and 2.80 GPa, representing increases of 23.9% and 12.0%, respectively. Its thermal conductivity reached 0.1640 W·m -1 ·K -1 , a 138% improvement over 6FBT-R. Furthermore, the O 2 /N 2 selectivity increased by 26%, from 5.8 to 7.3. This study provides valuable insights into the rational design of advanced polyimides with optimal physical and gas separation performance.
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产品关联
DOI
高影响因子
Inorganic and Nano-Metal Chemistry
·
2026
·
IF 1.6
Xie Xiaoling,Li Wei
By precisely tailoring the calcination temperature of the electrospun polymer precursor, we succeeded in fabricating spinel-structured CuFe2O4 nanotubes that possess a well-defined nanotube architecture with outer diameters ranging from 200 to 300 nm. Compared with the mixed CuO and α-Fe2O3 phases formed at lower temperatures, these single-phase nanotubes offer significantly enhanced gas-sensing performance. Operating at an optimal working temperature of 200 °C, the CuFe2O4 nanotubes exhibit a pronounced response toward 1 ppm hydrogen sulfide (H2S), achieve an impressive detection limit as low as 100 ppb, and demonstrate excellent linearity (R2 ≈ 0.996) across the concentration range of 0.1–3 ppm. This combination of high sensitivity, low detection limit, and reliable quantification capability makes the CuFe2O4 nanotubes highly promising for real-time, trace-level H2S monitoring in environmental, industrial, and breath-analysis applications.
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DOI
高影响因子
Coatings
·
2021
·Vol. 11
·期 5
·547
·
IF 2.881
Minyu Bai,Shuai Wen,Jijie Zhao,Yuxuan Du,Fei Xie,Huan Liu
The carrier gas flow field plays a vital role in the chemical vapor deposition (CVD) process of two dimensional (2D) MoS2crystal, which was studied by simulations and experiments. Different carrier gas flow fields were studied by utilizing three types of precursor carrier which affected the local gas flow field significantly. The experiment results showed that the appropriate precursor vapor concentration could be achieved by local carrier gas flow field conditioning, resulting in single 2D MoS2crystals of a large size and a high coating rate of 2D MoS2crystal on the target substrate surface. The carrier gas flow also contributed to the growth of the 2D MoS2crystal when it flew towards the target surface. The size of deposited single 2D MoS2crystal reached tens of micrometers and a few layers of 2D MoS2crystal were characterized and confirmed.
研究领域:
材料科学
·
物理化学
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DOI
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 41
·15451-15457
·
IF 8.067
Xi-Zhu Zhang,Wen-Jing Zhu,Zhong-Xi Yang,Yi Feng,Lin-Lin Fan,Guang-Gang Gao,Hong Liu
The sensitive and selective detection of ethylenediamine (EDA) has great significance due to its threat to environment and human health. Herein, a rationally designed polyoxometalate–viologen complex (1) has been demonstrated, in which the viologen molecules are hydrogen bonded to Dawson-type polyoxoanions. When complex 1 is in the atmosphere of EDA, the chromic intensity or Raman signals present proportional response to EDA concentrations. In particular, a very low detection limit of 0.1 ppb can be obtained for 1 based on its Raman signal output, which is the most sensitive complex than the reported EDA sensors. Also, high selectivity is observed for 1 when other amine molecules coexist as interfering compounds. According to the structural analysis and comparative experimental results, the highly sensitive and selective chromic or Raman response can be ascribed to the existence of viologen in the crystal lattice, which can not only accept electrons from EDA but also effectively accelerate the electron transfer to polyoxometalate. This work affords a novel concept for the design of highly sensitive and dual response polyoxometalate-based sensors by virtue of viologen-boosting electron transfer.
研究领域:
材料科学
·
环境科学
·
化学传感器
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DOI
高影响因子
Gas Science and Engineering
·
2023
·
IF 0
Rui Zhang,Haonan Liu,Ruixi Liu,Yingjie Niu,Luning Yang,Francesco Barzagli,Chao'en Li,Min Xiao
The blending of primary amines, with fast reaction kinetic, together with tertiary amines, with a large loading capacity, is an increasingly popular approach to develop high-performance CO 2 capture sorbents with low energy requirements for regeneration. In this study, we investigated the CO 2 absorption performance of several aqueous solutions obtained by mixing ethanolamine (MEA) and diethylethanolamine (DEEA) and compared them with that of individual MEA and DEEA. CO 2 loadings at equilibrium were measured experimentally under a wide range of operating conditions, at temperatures between 298 and 323 K, CO 2 partial pressures in the range 5–60 kPa, and different amine mixing ratios. In addition, 13 C NMR spectroscopy was employed to elucidate the reaction mechanisms and identify the species formed during CO 2 capture. The results of the study reveal the intricate interplay of MEA and DEEA in CO 2 capture, where MEA carbamate formation predominates in the early stages, gradually shifting to bicarbonate formation as the amine concentration decreases. Moreover, excess properties, which reflect non-ideal behaviors in amine blends, were introduced as a key parameter in the study. An excess property model, based on excess CO 2 loading, was developed to accurately predict the CO 2 equilibrium solubility without constant experimental measurement. As a result, good agreement was found between the experimental data and those calculated with the model (excess CO 2 loading) under the same operating conditions, with a average relative deviation of 1.1%.
研究领域:
化学工程
·
环境科学
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DOI
CHINESE JOURNAL OF POLYMER SCIENCE
·
2020
·Vol. 39
·期 3
·355-364
·
IF 3.154
Ma Ying-Ying,Liu Min,Wang Jing-Tao,Zhu Bin,Li Yi-Fan
Recently, hollow filler as an emerging concept is attracting more attention in preparation of mixed matrix membranes (MMMs). Herein, poly(ethylene glycol) microcapsules (PMC) are synthesized via distillation precipitation polymerization and embedded into the polyetherimide (Ultem®1000) matrix to fabricate MMMs for CO 2 capture. The PMC exhibits a preferential hollow structure within the Ultem matrix to furnish highways within membrane, and thus achieve high gas permeability. Meanwhile, the favorable affinity of poly(ethylene glycol) (PEG) microcapsule with ether oxygen group (EO) towards CO 2 enhances the CO 2 solubility selectivity. Such integration of physical and chemical microenvironments in the as-designed PEG microcapsule affords highly enhanced CO 2 separation performance. Compared to pristine Ultem®1000, the membrane with 2.5 wt% PMC loading exhibits 310% increment in CO 2 permeability and 22% increment in CO 2 /N 2 selectivity, which shows the promising prospects of designing PEG-containing microcapsules as the filler of MMMs for CO 2 capture.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
JOURNAL OF PHYSICAL CHEMISTRY A
·
2017
·
IF 2.847
Anne Rodriguez,Olivier Herbinet,Xiangzan Meng,Christa Fittschen,Zhandong Wang,Lili Xing,Lidong Zhang,Frédérique Battin-Leclerc
A wide range of hydroperoxides (C1–C3 alkyl hydroperoxides, C3–C7 alkenyl hydroperoxides, C7 ketohydroperoxides, and hydrogen peroxide (H2O2)), as well as ketene and diones, have been quantified during the gas-phase oxidation of n-heptane. Some of these species, as well as C10 alkenyl hydroperoxides and ketohydroperoxides, were also measured during the oxidation of n-decane. These experiments were performed using an atmospheric-pressure jet-stirred reactor at temperatures from 500 to 1100 K and one of three analytical methods, time-of-flight mass spectrometry combined with tunable synchrotron photoionization with a molecular beam sampling: time-of-flight mass spectrometry combined with laser photoionization with a capillary tube sampling, continuous wave cavity ring-down spectroscopy with sonic probe sampling. The experimental temperature at which the maximum mole fraction is observed increases significantly for alkyl hydroperoxides, alkenyl hydroperoxides, and then more so again for hydrogen peroxide, compared to ketohydroperoxides. The influence of the equivalence ratio from 0.25 to 4 on the formation of these peroxides has been studied during n-heptane oxidation. The up-to-date detailed kinetic oxidation models for n-heptane and for n-decane found in the literature have been used to discuss the possible pathways by which these peroxides, ketene, and diones are formed. In general, the model predicts well the reactivity of the two fuels, as well as the formation of major intermediates.
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DOI
高影响因子
ENERGY & FUELS
·
2021
·
IF 3.605
Dongxu Zhang,Qiyu Huang,Rongbin Li,Huiyuan Li,Wei Wang,Haimin Zheng,Xiangrui Zhu,Xun Zhang
Asphaltenes in crude oils may affect hydrate formation in water–oil emulsions, complicating flow assurance and hydrate management in subsea oil–gas multiphase pipelines. In this study, the effects of asphaltenes on hydrate nucleation and growth in water-in-oil emulsions were investigated. It was found that the presence of asphaltenes inhibited hydrate nucleation. The inhibiting effect was enhanced with the increase in asphaltene content from 0 to 0.15 wt % and then was lowered with further increase in asphaltene content from 0.15 to 0.30 wt %. The asphaltenes were found to decrease the formed amount of hydrates. In addition, the effects of water cut, stirring rate, and reformation process on hydrate formation in asphaltene-containing emulsions were studied. The results showed that the nucleation rate of hydrates decreased with a reduction in water cut. The hydrate growth rate first increased and then decreased with decrease in the water cut, which could be attributed to the combined effects of gas concentration and water amount. Furthermore, both the nucleation rate and the growth rate of hydrates were observed to increase with an increase in the stirring rate, indicating the promoting effect of a high stirring rate on hydrate formation in asphaltene-containing emulsions. Finally, it was demonstrated that hydrates nucleated more easily during the reformation process. However, the growth rate during the reformation process was lower than that in the first formation. The results from this study have potential flow assurance applications when asphaltenes and hydrates coexist in the subsea pipelines.
研究领域:
石油工程
·
流体力学
·
胶体与界面化学
·
能源材料
·
多相流系统
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Xiao Wang,Tongkai Wang,Guangkuo Si,Yang Li,Shouwei Zhang,Xiaolong Deng,Xijin Xu
Surface oxygen vacancy defects (OV) are regarded to be beneficial to the gas sensing behavior by significantly improving the carrier density and providing more oxygen adsorption sites. In this work, Ce-doped α-Fe 2 O 3 composites with abundant OV defects were synthesized using an oil bath method assisted with annealing treatment. Morphological characterization results indicate that the lamellar architecture of α-Fe 2 O 3 is transformed to nanospheres composed of massive nanoparticles with small sizes (7–9 nm) after introducing Ce elements. Gas sensing results show that the FeCe10 (Fe/Ce = 10:1) sensors exhibit enhanced acetone sensing response of 26.3–100 ppm gas at the operating temperature of 220 °C toward that of pure α-Fe 2 O 3 . Most importantly, X-ray photoelectron spectroscopy and electron spin resonance spectroscopy results confirm that the sensing responses of Ce-doped α-Fe 2 O 3 sensors are directly related to the OV defects, that is, the larger the quantity of the OV defects, the higher the sensing response. The unpaired electrons trapped in OV defects can provide more active sites for adsorption of oxygen and acetone molecules, resulting in a thicker depletion layer and a higher potential barrier. Our work highlights the decisive role of OV defects in gas sensors, which can also provide a rational approach to boost the sensing performance.
研究领域:
材料科学
·
传感器技术
·
纳米材料
·
表面化学
·
半导体物理
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Zhe Liu,Xichao Mo,Shuhao Tian,Jie Chen,Yanpeng Liu,Haiyang Wu,Yawei Zhao,Yanrong Wang,Shanglong Peng
As one of the two-dimensional (2D) nanomaterials , MXene exhibits great potential on gas-sensing owing to its high specific area, rich functional groups and great charge transfer mobility. Herein, electrostatic adsorption and calcination strategies were taken for ZIF-derived Co 3 O 4 and alkalized Ti 3 C 2 T x MXene to fabricate Co 3 O 4 /MX7.5 heterojunction . It can be found that Co 3 O 4 nanoparticles (NPs) uniformly grow on the surface of alkalized Ti 3 C 2 T x . Alkalized Ti 3 C 2 T x with lower work function (lower than 3.9 eV) can transfer more electrons towards Co 3 O 4 and promote the redox of Co 2+ . These increased Co 2+ ions can help to adsorb more adsorbed oxygen and produce more oxygen defects, which enhances contact interaction between ethanol molecules and adsorption sites. The formation of heterojunction between Co 3 O 4 and MXene is observed by UV–vis spectra, and this interface effect enhances the ability of gas sensors. Therefore, the sensors based on the obtained Co 3 O 4 /MX7.5 heterojunction can operate at a relatively low temperature (140 °C) with a response of 3500 % and a low detection limit of 1 ppm. And it also delivers long-term stability (about 30 days). This work demonstrates practical application for detecting ethanol at a relatively low working temperature and keeping their response in a long term.
研究领域:
材料科学
·
纳米科技
·
传感器技术
·
表面化学
·
功能材料
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DOI
高影响因子
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