Micromachines
·
2025
·Vol. 17
·期 1
·20
·
IF 3
Rongguang Zhang,Xuanzhi Zhang,Jianfeng Sun,Shize Huang,Xuan Zhang,Guohuai Lin,Xun Chen,Zhifeng Wang,Jiecai Long,Weiming Shu
Gas-assisted coaxial electrospinning (GACES), a simple and versatile technique for the large-scale fabrication of coaxial nanofiber membranes, possesses significant industrial potential across advanced manufacturing sectors including semiconductors—particularly for fabricating high-precision dielectric layers, high-uniformity encapsulation materials, and flexible semiconductor substrates requiring tailored core-shell architectures. However, there is still a lack of relevant studies on the effective regulation of the core-shell structures of coaxial fibers based on GACES, which greatly limits the batch preparation and wide application of coaxial fibers. Finite element simulation analysis of the flow field and development of the coaxial jet mechanics model with a gas-driven flow field—two key methodologies in this study—successfully uncovered the influence mechanism of gas-assisted flow fields on the core-shell structures of coaxial nanofibers. By adjusting the gas-assisted flow fields parameters, we reduced the total diameter of coaxial fibers by 47.33% (average fiber diameter: 334.12 ± 16.29 nm → 175.98 ± 1.18 nm), decreased the shell thickness by 72.98%, increased the core-shell ratio by 289% (core-shell ratio: 0.49 → 1.91), and improved the uniformity of the total diameter distribution of coaxial fibers by 30.64%. This study delivers a practical conceptual framework and robust experimental underpinnings for the scalable fabrication of coaxial nanofiber membranes with controllable core-shell structures, thereby promoting their practical application in semiconductor devices such as ultra-thin dielectric layers, precisely structured encapsulation materials, and high-uniformity templates for nanoscale circuit patterning.
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产品关联
DOI
PubMed
高影响因子
Atmosphere
·
2025
·Vol. 17
·期 1
·
IF 2.3
Chengyi Qiu,Zekai Jin,Meisi Chen,Li Wang,Sisi Li,Gang Zhang,Muhua Chen,Xinbao Zhu,Bo Fu
In order to solve the problems of high volatility and insufficient absorption effect when using chemical by-product washing oil to treat benzene-containing waste gas, this study innovatively proposed a composite solvent screening method based on the solvation free energy (ΔGsol), and reasonably predicted the absorption performance of 26 solvents for benzene. Through theoretical calculation and experimental verification, tetraethylene glycol dimethyl ether (TGDE) was finally determined to be the optimal composite component of washing oil. The absorption efficiency of the composite solvent reached 96.2%, and the regeneration efficiency was stable after 12 cycles with a mass loss of only 2.4%. Quantum computing simulation revealed that the dispersion force is dominant between benzene and the solvent, and TGDE enhances the electrostatic interaction through weak hydrogen bonds. The synergistic effect of the two improves the absorption performance. This study provides theoretical and technical support for the development of efficient and renewable benzene waste gas recovery solvent systems.
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高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2025
·
IF 6.2
Yixin Cai,Wenxuan Xu,Kangrui Yuan,Ranhua Xiong,Louqian Zhang,Chaobo Huang
Pancreatic α and β cells secrete glucagon and insulin, respectively, and regulate blood glucose through feedback mechanisms. To fully simulate the functions of pancreatic α and β cells within the same microsphere, cellulose/chitosan-based Janus microspheres (JMs) were created using the gas-shearing microfluidics, allowing for precise blood glucose regulation through coordinated dual-hormone release. One compartment of the JMs is primarily made up of carboxymethyl cellulose and glucagon. The dissociation of hydrogen bonds in the cellulose hydroxyl network causes swelling and releases glucagon when pH > 7.4. The other compartments of the JMs primarily consist of chitosan, insulin, and glucose oxidase (GOD). GOD reacts with glucose to produce gluconic acid (3.77 < pH < 6.86), which protonates the amino groups on chitosan, releasing insulin. In coculture experiment, JMs maintained blood glucose within the normal range within 1–2 h without showing hypoglycemic symptoms, with microspheres sustaining normal blood glucose levels for approximately 10–11 h.
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DOI
PubMed
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2018
·
IF 3.716
Yan-Xia Li,Shi-Guo Fu,Jun-Hui Zhang,Sheng-Ming Xie,Lang Li,Yu-Yu He,Min Zi,Li-Ming Yuan
A highly ordered chiral mesoporous silica-coated capillary column has been used for high-resolution gas chromatographic separations. The column has excellent selectivity, not only for the separation of isomers, polycyclic aromatic hydrocarbons, linear alkanes, long chain alkanes, Grob’s test mixture and aromatic hydrocarbons, but also for the resolution of different classes of chiral compounds. Additionally, the column exhibits high column efficiency, excellent temperature resistance, and analysis times are short. This is the first report of a highly ordered chiral inorganic mesoporous silica used in separation science.
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高影响因子
JOURNAL OF SEPARATION SCIENCE
·
2016
·Vol. 39
·期 6
·1137-1143
·
IF 2.741
Yi Wang,Haiyan Hu,Yue Su,Fang Zhang,Yinlong Guo
Because of the extreme complexity of metabolomic samples, the effectiveness of quantitative gas chromatography with time-of-flight mass spectrometry depends substantially on the expansion of the linear dynamic range. Facing the existence of numerous saturated detector signals, a data processing method based on monitoring isotopologues has been developed. The monoisotopic ion kept the high mass spectrometry sensitivity, and the less abundant isotopologue ions extended the linear dynamic range. This alternative method was proved to extend the linear dynamic range to five orders of magnitude successfully and overcome the quantitative problems induced by the ion detector saturation. Finally, to validate the applicability, the method was applied to a metabolomic assay of Alzheimer's disease. Comparing with the traditional monoisotopic method, the use of monitoring isotopologues helped us to discover an additional eight metabolites with significant difference and to conduct a more reliable principal component analysis as well. The results demonstrated that monitoring isotopologues in quantitative gas chromatography with time-of-flight mass spectrometry could improve the authenticity of metabolomic analysis.
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高影响因子
JOURNAL OF PHYSICS D-APPLIED PHYSICS
·
2020
·Vol. 53
·期 32
·325102
·
IF 3.169
Guojia Huang,Yujie Li,Cui Chen,Zizheng Yue,Wei Zhai,Maodong Li,Bo Yang
A novel photonic crystal fiber (PCF) Mach–Zehnder interferometer (MZI) was proposed for detecting hydrogen sulfide (H2S) gas. Two single-mode fibers (SMFs), two multi-mode fibers (MMFs), and a PCF are sequentially fused to form a MZI with SMF-MMF-PCF-MMF-SMF structure. Titanium dioxide/amino-functionalized graphene quantum dots (TiO2/af-GQDs) composite is coated on the surface of the PCF as a sensing membrane. The fabricated sensing membrane is characterized by x-ray photoelectron spectroscopy, x-ray diffraction and scanning electron microscopy. Furthermore, the properties of the sensor are examined. The results show that a uniform TiO2/af-GQDs film with a thickness of 1 μm is successfully coated on the surface of the PCF. The sensor has a sensitivity of 26.62 pm ppm−1, showing good linearity and selectivity for H2S in the range of 0 ∼ 55 ppm. The response time and recovery time are about 68 s and 77 s, respectively. The sensor has the advantages of low cost, small volume and simple structure, which is suitable for on-line monitoring of H2S.
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高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Shuai Fan,Zihao Fan,Huiyuan Cheng,Manman Feng,Xuemei Wu,Dongwei Pan,Fujun Cui,Gaohong He
A 3D integrated hierarchical porous N-doped Sn/CNT@N C gas diffusion electrode is proposed via phase inversion to synergistically improve electron-proton-gas transfer and efficiency of CO 2 reduction reaction (CO2RR). Hierarchical porous structure is tuned by the carbon nanotube additive during phase inversion, which integrates microporous layer and diffusion layer to decrease mass transfer resistance comparing with the 2D layer structure of commercial carbon paper . XPS results show that Sn/CNT@N C 800 contains pyridinic nitrogen and pyrrolic nitrogen with catalytic activity. EIS and LSV curves show that Sn/CNT@N C 800 is beneficial to reduce mass transfer resistance and increase current density after twice hydrophobic treatments. As a result, Sn/CNT@N C 800 shows higher CO 2 RR electrocatalytic activity. The reaction rate and Faraday efficiency of CO at 12 mA cm −2 increase by 40.2% and 40.6%, respectively compared with Sn/carbon paper. The reaction rate and Faraday efficiency of formate are also slightly higher than those of Sn/carbon paper.
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高影响因子
Journal of Environmental Sciences
·
2018
·
IF 3.12
Yongpeng Ma,Bailong Mu,Xiaojing Zhang,Hongzhong Zhang,Haomiao Xu,Zan Qu,Li Gao
Hierarchical Ag-SiO 2 @Fe 3 O 4 magnetic composites were selected for elemental mercury (Hg 0 ) removal from non-ferrous metal smelting flue gas in this study. Results showed that the hierarchical Ag-SiO 2 @Fe 3 O 4 magnetic composites had favorable Hg 0 removal ability at low temperature. Moreover, the adsorption capacity of hierarchical magnetic composite is much larger than that of pure Fe 3 O 4 and SiO 2 @Fe 3 O 4 . The Hg 0 removal efficiency reached the highest value as approximately 92% under the reaction temperature of 150°C, while the removal efficiency sharply reduced in the absence of O 2 . The characterization results indicated that Ag nanoparticles grew on the surface of SiO 2 @Fe 3 O 4 support. The large surface area of SiO 2 supplied efficient reaction room for Hg and Ag atoms. Ag–Hg amalgam is generated on the surface of the composites. In addition, this magnetic material could be easily separated from fly ashes when adopted for treating real flue gas, and the spent materials could be regenerated using a simple thermal-desorption method.
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高影响因子
ACS Applied Energy Materials
·
2020
·
IF 4.473
Manojkumar Balakrishnan,Pranay Shrestha,Nan Ge,ChungHyuk Lee,Kieran F. Fahy,Roswitha Zeis,Volker P. Schulz,Benjamin D. Hatton,Aimy Bazylak
We present electrospinning as a versatile technique to design and fabricate tailored polymer electrolyte membrane (PEM) fuel cell gas diffusion layers (GDLs) with a pore-size gradient (increasing from catalyst layer to flow field) to enhance the high current density performance and water management behavior of a PEM fuel cell. The novel graded electrospun GDL exhibits highly robust performance over a range of inlet gas relative humidities (RH). At relatively dry (50% RH) inlet conditions that exacerbate ohmic losses, the graded GDL lowers ohmic resistance and improves high current density performance compared to a uniform GDL with larger pores and fiber diameters. Specifically, the graded GDL facilitates a beneficial degree of liquid water retention at the catalyst layer/GDL interface due to the high capillary pressure inherent in its microstructure, thereby improving membrane hydration. Additionally, enhanced graphitization and connectivity of the graded electrospun fibers improves heat dissipation from the catalyst layer interface compared to the GDL with larger fiber diameters, thereby reducing membrane dehydration. When the inlet RH is raised to fully humid (100% RH) conditions, the graded GDL mitigates liquid water accumulation and lowers mass transport resistance. Specifically, the pore size gradient directs the removal of liquid water from the GDL, resulting in superior performance at high current densities.
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高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2015
·
IF 4.169
Liu-Lian Huang,Hui-Chao Hu,Li-Hui Chen
This work reports on a novel method for the determination of total acid (TA) in biomass hydrolysates by a solvent-assisted and reaction-based headspace gas chromatography (HS-GC). The neutralization reaction between the acids in hydrolysates and bicarbonate in an ethanol (50%) aqueous solution was performed in a closed headspace sample vial, from which the carbon dioxide generated from the reaction was detected by HS-GC. It was found that the addition of ethanol can effectively eliminate the precipitation of some organic acids in the biomass hydrolysates. The results showed that the reaction and headspace equilibration can be achieved within 45 min at 70 °C; the method has a good precision (RSD < 3.27%) and accuracy (recovery of 97.4–105%); the limit of quantification is 1.36 μmol. The present method is quite suitable to batch analysis of TA content in hydrolysate for the biorefinery related research.
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高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2019
·
IF 3.858
Xiaomei Chen,Zhian Guo,Yi Wang,Yufeng Liu,Yidong Xu,Jie Liu,Zhiqiang Li,Jingchan Zhao
A novel dispersive liquid-liquid microextraction method based on temperature-sensitive polymer-induced phase separation was assessed for the determination of phenol, 2,4-dichlorophenol (2,4-DCP), β-naphthol, and bisphenol A. The interaction between β-cyclodextrin-poly (N-isopropylacrylamide) and 2,4-DCP was investigated. The results showed that there was an interaction between 2,4-DCP and the polymer with coiled structures and globular structures. The parameters that affected the extraction of phenols were optimized for the peak area. Under optimal conditions, the correlation coefficients were in the range of 0.9828-0.9990. The limits of detection for all the analytes varied from 0.01 to 1.0 μg L −1 , and the limits of quantification were between 0.04 and 3.50 μg L −1 . The established method was applied successfully to analyze three moat river samples. The relative recoveries were between 81.3 and 117.3%, and the relative standard deviations were less than 17%.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Zhongming Wang,Xiaoying Peng,Chuyun Huang,Xun Chen,Wenxin Dai,Xianzhi Fu
A series of polyaniline–titanium dioxide (PANI/TiO 2 ) nanocomposite film sensor were fabricated by an in-situ chemical oxidation polymerization of aniline at TiO 2 (anatase) surface, and were evaluated the CO gas sensitivity under UV irradiation at room temperature. Although adding PANI into TiO 2 seemed to weaken the photo-assisted conductivity of film sensor sample at N 2 atmosphere, it enhanced the photo-assisted gas sensitivity to CO. Based on the chemical characterization results of PANI/TiO 2 by FT-IR, Raman and XPS, it is proposed that the protonated N site in PANI chains (formed by TiO 2 interacting with PANI) would promote the adsorption of CO, resulting in the more electrons from CO to PANI by the typical π–conjugated structures of benzenoid and quinonoid units and then to TiO 2 by the hydrogen bonds (N⋯H⋯O) in the interface of PANI and TiO 2 . Moreover, the presence of H 2 O could enhance this photo-assisted gas sensitivity. Furthermore, the PANI/TiO 2 powder sample also exhibited a higher activity of photocatalytic oxidizing CO than the pure TiO 2 sample, indicating that the enhancement in the photo-assisted sensing response to CO would benefit the photocatalytic oxidation of CO over PANI/TiO 2 . This study not only provides a possible approach to develop a photo-assisted gas-sensitive material by introducing the structure of organic-inorganic hybrided nanocomposite, but also provides a possible method to estimate the photocatalytic activity of a semiconductor material by testing its photo-assisted sensitivity to the reactant gas.
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高影响因子
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