JOURNAL OF CHROMATOGRAPHY A
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2025
·
IF 4
Lei Yu,Bo Liu,Pucheng Wang,Shuai Liu,Junjie Sheng,Yinyong Ao
1,4-Bis(phenylethynyl)benzene blended with an activated carbon-supported palladium catalyst (DEB-Pd/C) has been demonstrated as an effective hydrogen scavenger in reducing hydrogen gas accumulation within vacuum-sealed and hermetically closed systems. Accurate determination of the hydrogen mass fraction in reacted 1,4-bis(phenylethynyl)benzene is essential for guiding the replacement of hydrogen-absorbing materials. In this study, a novel method for determining the hydrogen mass fraction in reacted DEB was developed. First, the reaction products of DEB with hydrogen gas were isolated and characterized using gas chromatography-mass spectrometry (GC-MS). A correlation between the peak areas of the reaction products and the saturation level of DEB was established. The hydrogen mass fraction in the reacted DEB was precisely determined based on the relationship between DEB saturation and hydrogen content. Furthermore, the effect of O₂ on the hydrogen uptake of DEB was investigated using the developed method. The results demonstrate that this method exhibits high detection sensitivity and accuracy for determining the hydrogen mass fraction in reacted DEB, offering a reliable approach for monitoring hydrogen absorption in such systems.
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SENSORS AND ACTUATORS B-CHEMICAL
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2025
·
IF 7.7
Jihua Xu,Chengrui Zhang,Ziluo Chen,Xiaofei Zhao,Zhen Li,Jing Yu,Chao Zhang,Yuzhi Song,Mingrui Shao
There is an immense potential for surface-enhanced Raman scattering (SERS) sensors in realizing the monitoring of poison gas. However, conventional SERS detection techniques are difficult to achieve omnidirectional detection, resulting in poor signals under large-angle laser excitation. Herein, urchin-shaped manganese dioxide (MnO 2 ) microspheres were grown directly in the flexible polyvinylidene fluoride (PVDF) cavity (PC) to obtain PC/MnO 2 (PCM). The PCM was modified by silver nanoparticles (Ag NPs) and zeolite imidazole framework-8 (ZIF-8) to form the PCM/Ag/ZIF-8 SERS sensor. In addition to enriching the target molecules and protecting the internal Ag NPs, ZIF-8 nanoparticles are able to modulate the distribution of “hot spots” on the spines of urchin-shaped MnO 2 . This modulation ensures the reliability of the PCM/Ag/ZIF-8 sensor by maintaining excellent SERS detection performance even under large-angle laser excitation. Furthermore, the unique urchin-shaped structure enables the gas to form vortex between neighboring spines, which greatly slows down the airflow and improves the contact time between the gas molecules and the sensor, thus achieving effective enrichment of the gas molecules. Experimental results show that the PCM/Ag/ZIF-8 sensor is capable of detecting formaldehyde gas at concentrations as low as 1 ppb. This work provides an innovative approach for reliable detection of toxic gases in practical applications.
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MICROCHIMICA ACTA
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2025
·Vol. 192
·期 8
·1-12
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IF 5.3
Ali Luqman,Adhikari Kishor Kumar,Wei Jie,Yi Yang,Wang Gaofeng,Wang Cong
Recent advancements in sensor technology have heightened the demand for more sensitive gas detection methods, crucial for improving environmental monitoring and industrial safety applications. This study investigates the potential of a hybrid of laser-induced graphene (LIG) and MoO 3 nanoflakes via a planar microwave resonator for detecting ethanol gas with high sensitivity. To implement the proposed sensor, a rectangular-shaped graphene layer was patterned on a polyimide substrate using a computer-controlled CO 2 laser and functionalized with MoO 3 nanoflakes. The LIG/MoO 3 hybrid was attached to the high-field distribution zone of a planar microwave resonator, which consisted of electromagnetically coupled split-ring resonators (SRRs), thereby improving the detection sensitivity for ethanol gas. As a proof of concept, a prototype of the microwave resonator sensor interfaced with a LIG/MoO 3 hybrid was developed and tested for its ability to detect different volatile organic compounds (VOCs) and monitor a wide range of ethanol concentrations. Integrating the resonator sensor with a LIG/MoO 3 hybrid achieved rapid (~ 45 s), linear, and sensitive (193 kHz/ppm) detection and characterization of ethanol gas (25 to 800 ppm) using shifts in its baseline resonant frequency of 4.067 GHz. Additionally, functionalizing the LIG interface with MoO 3 nanoflakes resulted in a gas sensing response that was boosted by a factor of up to 1.825 times the sensitivity compared to LIG and MoO 3 as gas-sensitive interfaces. The achieved results demonstrate the potential of LIG/M O O 3 -interfaced microwave resonator sensor in detecting and characterizing ethanol gas for environmental quality monitoring. Graphical
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ADVANCED FUNCTIONAL MATERIALS
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2024
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IF 18.5
Xiulian Fan,Zhihui Chen,Defeng Xu,Luwei Zou,Fangping Ouyang,Shibin Deng,Xiao Wang,Jiong Zhao,Yu Zhou
As for nonlayered 2D polymorphic materials, especially for Cr-based chalcogenides, large-area thin film growth with phase control is considered the most important synthesis challenge for magnetic, electronic, and optoelectronic devices. However, the synthesis methods of large continuous thin films for nonlayered 2D materials are still limited and rarely reported, also for the phase control growth, which is inhibited by isotropic 3D growth and similar Gibbs free energy for different phases. Herein, enhanced mass transport chemical vapor deposition is established to achieve the control synthesis of trigonal Cr 2 S 3 thin films, in which the stable boundary layer supplies the continuous reaction species and tunes the reaction kinetics. The trigonal phase formation is confirmed by atomic structure characterization, optical absorption and piezoelectric measurements, demonstrating unique physical properties different from rhombohedral phase. The trigonal Cr 2 S 3 thin films show obvious layer independent and dissimilar angle-resolved harmonic generation, indicating the surface broken symmetry that can be understood by the combination of negligible piezoelectric response for bulk. The work presents the large-area synthesized strategy by the modification of mass transport for nonlayered 2D materials with new phase formation and establishes the surface symmetry breaking dominated SHG mechanism for future nonlinear optical materials.
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JOURNAL OF MEMBRANE SCIENCE
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2025
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IF 9
Jinwei Zhang,Yujun Zhang,Ning Li,Shilin Nie,Leixin Yang,Yihao Luan,Yuchao Ma,Ge Wang,Kaihua Li,Long Jiao,Bowen Cheng
Physical aging presents a significant challenge that hinders the practical application of high-permeability polymer-based membranes. Herein, we have designed a polymer network membrane (PI–CO@Trip-TB (1:10)) featuring H-bonding interactions by regulating the ratio of the carboxyl-containing copolymer PI-CO (6FDA-FDA-DABA) to Trip-TB (Tröger's base), which significantly improved the anti-aging performance without compromising the high permeability. The introduction of PI-CO not only generates H-bonding interactions to enhance compatibility, but also the introduction of its linear chain segments effectively hinders the relaxation of the chain of the Trip-TB spatial structure. Which synergistically stabilizes the free volume elements and mitigates the rate of their temporal collapse. Compared to Trip-TB, the PI-CO@Trip-TB (1:10) polymer network membrane demonstrates outstanding anti-aging performance, in which the permeability of CO 2 and O 2 is maintained at approximately 60 % even after 90 days. Notably, the performance of both fresh and aged PI-CO@Trip-TB (1:10) membranes surpasses the 2008 Robeson upper bound (CO 2 /CH 4 ) and the 2015 Robeson upper bound (O 2 /N 2 ). Overall, this study establishes an effective strategy for designing high-permeability polymers with anti-aging properties for practical applications in separation membranes.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2025
·
IF 3.8
Sun Tao,Shen Xin,Yang Xinyu,Qi Haolong,Yang Kexin,Xing Yilin,You Mengyi,Duan Mengyao,Cai Zhiqiang,Nardiello Donatella,Quinto Maurizio,Liu Xianming,Zhang Shusheng
Cyclotriveratrylene (CTV) possesses a rigid and bowl-shaped architecture with a π -electron-rich cavity. In this work, CTV modified with C10 alkyl chains (CTV-C10) has been synthesized and used for the first time as a stationary phase for gas chromatography (GC) analysis. The statically coated CTV-C10 column showed moderate polarity and high column efficiency (3446 plates m −1 , determined by n -dodecane at 120 °C). Due to its nanoscale channels, the CTV-C10 column displayed a strong affinity for aromatic compounds. Compared with CTV and commercial HP-5 and HP-35 columns, the CTV-C10 column exhibited better performance for the critical resolution of dibromobenzene, dichlorobenzene, and chloronitrobenzene isomers. Moreover, CTV-C10 columns showed 0.02%, 0.09%, and 4.96% repeatability RSD values for intra-day, inter-day, and between-columns, respectively. This study demonstrated the feasibility of CTV-C10 columns, providing a new perspective for developing selective nanoscale separation channels through CTV stationary phases in chromatographic analysis. Graphical abstract
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JOURNAL OF MEMBRANE SCIENCE
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2025
·
IF 9
Linjun Wu,Yanying Xiu,Zhiqiang Shen,Yuexi Zhou,Jiane Zuo
This research introduces an innovative series-connected two-stage submerged gas permeable membrane (STSGPM) system for anaerobic digestate treatment, integrating ammonia recovery, digestate concentration, and water reclamation. The system achieved over 99 % ammonia removal across various temperature gradients, with the 65/55/25 °C gradient showing optimal water flux, where the average water flux of the first-stage SGPM (SGPM1) was recorded at 3.43 L/m 2 /h, while the second-stage SGPM (SGPM2) maintained a consistent flux of 4.25 L/m 2 /h. STSGPM achieved interception rates of 99.8 % and 99.41 % for inorganic ions and organic matter, respectively. After 10 cycles, SGPM2 remained stable, but SGPM1 experienced fouling from gel-like organic deposits (proteins, microbial products, fulvic acid), which were fully removed post-cleaning. The high-purity (NH 4 ) 2 SO 4 , the concentrated digestate meeting agricultural standards, and the reclaimed water compliant with urban miscellaneous water use standards highlight the effective reutilization of the three by-products. This aligns with the zero-discharge objective, underscoring the potential of STSGPM to advance resource recovery from anaerobic digestate. Additionally, the recovery of (NH 4 ) 2 SO 4 and high-quality water generates potential profits, reducing the net operating cost of the STSGPM system to $0.155 per kilogram of NH 3 recovery. Overall, the STSGPM process represents a cost-effective and efficient ammonia recovery strategy with significant potential for widespread application.
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LWT-FOOD SCIENCE AND TECHNOLOGY
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2025
·
IF 6.6
Shasha Yu,Xuchao Lan,Yimiao Tang,Yiruo He,Xiaxi Pan,Liming Ge,Changdao Mu,Zhilang Xu,Defu Li
Modified Atmosphere Packaging (MAP) technology holds significant potential for preserving fruits and vegetables. In this study, we explored a novel MAP gas regulation technology that regulates selective gas permeation and achieves gas equilibrium within the package. Inspired by natural leaf stomata that regulate plant respiration, we fabricated polyethyleneimine-modified porous chitosan microspheres (PEI-PCM) that mimic the function of stomatal ‘switches’ in order to enhance respiratory regulation. And PEI-PCM were introduced into the gelatin-tannic acid (GT) film to construct a biomimetic porous chitosan microsphere-composite gelatin-based film (GT@PEI-PCM, GTPP) for the preservation of perishable fruits (litchi and waxberry). GTPP film can control and regulate gas exchange driven by CO 2 concentration levels, achieving atmospheric equilibrium within 24 h and preventing oxidative damage to fruits. In addition, GTPP films demonstrated excellent tensile strength as well as water resistance, antibacterial, and antioxidant properties. The incorporation of modified microspheres could regulate the gas permeability and selectivity (CO 2 /O 2 : 0.79–2.53) of the gelatin-based films, which successfully prolonged the freshness of litchis and waxberries. Overall, this innovative gas permeation control strategy provides a novel concept for improving MAP technology.
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Catalysts
·
2025
·Vol. 15
·期 7
·694
·
IF 4
Ziyan Mi,Huayun Long,Yuhua Jia,Yue Ma,Cuilan Miao,Yan Xie,Xiaomei Zhu,Jiahui Huang
The development of non-noble metal catalysts for gas-phase propylene epoxidation with H2/O2remains challenging due to their inadequate activity and stability. Herein, we report a Cs+-modified Ni/TS-1 catalyst (9%Ni-Cs/TS-1), which exhibits unprecedented catalytic performance, giving a state-of-the-art PO formation rate of 382.9 gPO·kgcat−1·h−1with 87.8% selectivity at 200 °C. The catalyst stability was sustainable for 150 h, far surpassing reported Ni-based catalysts. Ni/TS-1 exhibited low catalytic activity. However, the Cs modification significantly enhanced the performance of Ni/TS-1. Furthermore, the intrinsic reason for the enhanced performance was elucidated by multiple techniques such as XPS, N2physisorption, TEM,29Si NMR, NH3-TPD-MS, UV–vis, and so on. The findings indicated that the incorporation of Cs+markedly boosted the reduction of Ni, enhanced Ni0formation, strengthened Ni-Ti interactions, reduced acid sites to inhibit PO isomerization, improved the dispersion of Ni nanoparticles, reduced particle size, and improved the hydrophobicity of Ni/TS-1 to facilitate propylene adsorption/PO desorption. The 9%Ni-Cs/TS-1 catalyst demonstrated exceptional performance characterized by a low cost, high activity, and long-term stability, offering a viable alternative to Au-based systems.
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Journal of Future Foods
·
2025
·
IF 7.2
Jinju Ma,Lijuan Yu,Kun Li,Hong Zhang,Baoshan Tang,Juan Xu,Lanxiang Liu
The rapid deterioration of fresh-cut fruits and vegetables remains a critical challenge to food safety and sustainability, highlighting the need for natural preservation strategies. Herein, we presented a bio-inspired shellac gel/chitosan (SG/CS) edible coating with gas-permeation control to extend the shelf life of fresh-cut lotus root. Molecular dynamics simulations revealed that shellac, as an atypical amphiphile, self-assembled under glucono delta-lactone induction through hydrophilic and hydrophobic interactions into transient vesicles or micelles, which aggregated into a porous gel network. Shellac gel particles incorporated into chitosan coatings retained abundant nanoporous structure upon drying on fresh-cut lotus root, modulating gas permeability and enabling a gas-permeation controlled edible coating. Acute oral toxicity tests in mice (LD₅₀ > 15,000 mg kg⁻¹) confirmed the coating to be practically non-toxic. Functionally, SG/CS coatings suppressed respiration rate, ethylene release, moisture loss, and enzymatic browning, maintaining color, texture, and nutritional quality of lotus root by modulating the surrounding gas microenvironment. Notably, the 0.1% SG/CS coating achieved superior preservation effects, extending freshness of fresh-cut lotus root to 8 days. This study introduces a safe and efficient preservation strategy and provides a promising alternative to conventional antibacterial or antioxidant coatings in the development of edible coatings for fresh-cut produce.
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International Journal of Minerals Metallurgy and Materials
·
2025
·Vol. 32
·期 5
·1220-1233
·
IF 7.2
Qin Qing,Xiong Gang,Han Lin,Zhang Yujuan,Shen Zhen,Ge Changchun
Digital light processing (DLP) is a crucial additive manufacturing (AM) technique for producing high-precision ceramic components. This study aims to optimize the formulation of Si 3 N 4 slurry to enhance both its performance and manufacturability in the DLP process, and investigate key factors such as particle size distribution, photopolymer resin monomer ratios, and dispersant types to improve the slurry’s rheological properties. Through these optimizations, a photosensitive Si 3 N 4 slurry with 50vol% solid content was developed, exhibiting excellent stability, and low viscosity (2.48 Pa·s at a shear rate of 12.8 s −1 ). The effects of gas-pressure sintering on the material’s phase composition, microstructure, and mechanical properties were further explored, revealing that this technique significantly increases the flexural strength of the green sample from (109 ± 10.24) to (618 ± 42.15) MPa. The sintered ceramics exhibited high hardness ((16.59 ± 0.05) GPa) and improved fracture toughness ((4.45 ± 0.03) MPa·m 1/2 ). Crack trajectory analysis revealed that crack deflection, crack bridging, and the pull-out of rod-like β-Si 3 N 4 grains, are the main toughening mechanisms, which could effectively mitigate crack propagation. Among these mechanisms, crack deflection and bridging were particularly influential, significantly enhancing the fracture toughness of the Si 3 N 4 matrix. Overall, this research highlights how monomer formulation and gas-pressure sintering strengthen the performance of Si 3 N 4 slurry in the DLP three-dimensional printing technique. This work is expected to provide new insights for fabricating complex Si 3 N 4 ceramic components with superior mechanical properties.
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JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Liyuan Chen,Guannan Chen,Zhiwei Zhao,Xiaolu Chen,Jinhui Pang,Zhenhua Jiang
Polymers of intrinsic microporosity (PIMs), as extremely promising materials for gas separation membranes, it is crucial to deeply investigate the relationship between their structures and properties. However, current efforts in PIMs structural development focus primarily on screening tetraphenol monomers with suitable contorted units, while systematic studies on the precise structural design of tetrafluorinated monomers and the corresponding structure-property relationships of the resulting PIMs remain scarce. In this study, a novel tetrafluorinated monomer featuring Schiff base units, namely 2,3,6,7-tetrafluoro-N9,N10-diphenylanthracene-9,10-diimine (TFNAD), was synthesized. A series of its derivatives with substituents of different sizes and positions (ortho-methyl, meta-methyl, meta-trifluoromethyl) was also developed. These monomers were then copolymerized with TTSBI and TFTPN to prepare a series of PIM-TFNAD-X copolymers. The influence of the substituents on the chain packing behavior, BET surface area, and pore size distribution of this series was systematically investigated, thereby revealing their impact on gas separation performance and physical aging behavior. Notably, the ortho-methyl substituted polymer (PIM-TFNAD-oMe), benefiting from the effect of the methyl in effectively disrupting the dense packing of polymer chains and restricting C-N bond rotation, significantly enhanced gas permeability while simultaneously maintaining selectivity, overcoming the permeability-selectivity trade-off to some extent. Furthermore, the separation performance of PIM-TFNAD-X was also evaluated under 15/85 CO 2 /N 2 mixed-gas conditions. This study not only introduces structurally tunable novel tetrafluorinated monomers to enrich the PIMs material library but also offers new insights into understanding their structure-property relationships.
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