SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Xu Tian,Lijia Yao,Xiuxiu Cui,Rongjun Zhao,Xuechun Xiao,Yude Wang
Fast and effective detection of harmful gases is crucial criterion for the current development of gas sensors. In this paper, a novel n-butanol gas sensor using Al-doped CdIn 2 O 4 nanofibers (ACO NFs) is synthesized by an electrospinning method . The different morphologies of the as-prepared ACO NFs are controlled by doping different Al contents . Systematic characterizations demonstrate that the doping of Al to CdIn 2 O 4 NFs would enhance the reaction activities between the gas and sensing materials, such as generating large amounts of adsorbed oxygen and improving the specific surface area of sensing materials. The results show that the detection limit of all prepared sensors for n-butanol is sub-ppm, and less than 250 ppb. The optimal Al-doped CdIn 2 O 4 (5.0% Al/Cd molar ratio) based gas sensor results in 3.32-fold enhancement in gas response to 200 ppm n-butanol at an operating temperature of 300 °C and exhibits excellent long-term stability compared with the pure CdIn 2 O 4 . Hence, ACO NFs can be regarded as a promising sensing material for low-concentration n-butanol gas detecting. Also, the mechanisms for improving the sensing performance of ACO NFs based gas sensor are proposed.
研究领域:
材料科学
·
化学
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DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2015
·Vol. 31
·期 5
·787-791
·
IF 0.875
Tang Cen,Jin Yanxia,Wang Xiaoxia,Hu Gengshen,Xie Guanqun,Li Xiaonian,Luo Mengfei
The manufacture of 1,1-dichloroethylene(1,1-DCE) usually employs liquid phase method to perform the dehydrochlorination of 1,1,2-trichloroethane(TCE), where large amounts of high-concentration salty wastewater is produced inevitably. It has been a long-term goal to achieve the gas phase synthesis of 1,1-DCE via supported catalysts. In this work, the gas-phase synthesis of 1,1-DCE from TCE was studied in the presence of pentaethylenehexamine( PEHA) supported on silica. High and stable selectivity to 1,1-DCE(up to 98%) was obtained, which could be ascribed to the relatively strong basicity of PEHA according to a proposed E2 mechanism. The formation of PEHA chloride from the HCl generated in situ was detected and was considered to be the main reason for the deactivation of PEHA catalyst.
研究领域:
化学工程
·
催化化学
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DOI
高影响因子
Gels
·
2022
·Vol. 8
·期 9
·556
·
IF 4.432
Xiao-Xiao Guo,Shi-Chang Hou,Hui-Juan Li,Jun Chen,Abdul Haleem,Wei-Dong He
The macro-porous structure of polymer cryogels provides an appropriate channel for the adsorption and transport of substances, endowing its application in the field of electrochemical sensing. The combination mode of a polymer matrix and electro-active substance, particularly the distribution of an electro-active substance in the matrix, has an important effect on the overall performance of the sensor. In this work, through the simultaneous oxidation coupling polymerization of aniline (ANI) and radical polymerization of acrylamide (AAm) under cryogenic condition, conductive composite cryogels were prepared, aiming for the uniform distribution of PANI in the PAAm matrix. The possibility of simultaneous polymerizations was symmetrically investigated, and the obtained PANI/PAAm cryogels were characterized. Due to the acid-doping of PANI, the electrical conductivity of PANI/PAAm cryogels could be modulated with acidic and basic gases. Thus, the performance of the gas sensor was studied by making conductive PANI/PAAm cryogel sheets as resistive sensor electrodes. We found that the content of PANI, the sheet thickness and the dry/wet state of the cryogel influenced the response sensitivity and rate as well as the recovery properties. The response duration for HCl and NH3gas was shorter than 70 and 120 s, respectively. The cyclic detection of HCl gas and the alternate detection of NH3/HCl were achieved. This gas sensor with advantages, including simple preparation, low cost and high sensitivity, would have great potential for the application to monitor the leakage of acidic and basic gases.Keywords:cryogels;electric conductivity;gas detection;polyaniline;polyacrylamide;simultaneous polymerization
研究领域:
材料科学
·
化学工程
·
传感器技术
✓ 已验证
DOI
PubMed
高影响因子
POLYMER
·
2021
·
IF 4.43
Yu Zhang,Won Hee Lee,Jong Geun Seong,Junming Dai,Shichao Feng,Yinhua Wan,Young Moo Lee,Yongbing Zhuang
The physical and gas transport properties of Tröger's Base (TB)-based polyimides (PI-TBs) synthesized by isomeric monomers were rarely reported. Here, a series of PI-TBs was synthesized from two iso -ether dianhydrides [4,4′-oxydiphthalic anhydride (4,4′-ODPA)/3,4′-oxydiphthalic anhydride (3,4′-ODPA)] and two iso -biphenyl dianhydrides [3,3′,4,4′-biphenyltetracarboxylic dianhydride (4,4′-BPDA)/3,4′-biphthalic anhydride (3,4′-BPDA)], with two diamines, 2,5-dimethyl-1,4-phenylenediamine (DPD) or 2,6-diaminotoluene (DAT). The solubility, microporosity, chain packing, mechanical performance and thermal stability, and gas transport properties were investigated for the PI-TBs derived from the isomeric dianhydrides. The polyimides derived from DPD and appropriate dianhydrides had better solubility and film-forming capability, mechanical properties , and higher gas permeability than those from DAT analogues. Furthermore, the polyimides based on different isomeric dianhydrides showed good solubility, mechanical properties, and high thermal stability and glass transition temperatures ( T g s), up to 400 °C. The chemical structures of isomeric dianhydrides have a noticeable influence on the chain packing and gas separation performance of the PI-TBs. The PI-TBs with rigid 3,4’-/4,4′-BPDA residues showed microporosity and their BET values in the range of 235.2–324.9 m 2 /g. The PI-TB membranes from the 3,4′-BPDA showed both higher gas permeability and selectivity (H 2 /CO 2 , H 2 /CH 4 , CO 2 /CH 4 ) compared to those from the 4,4′-BPDA. On the contrary, the PI-TB membranes from the 3,4′-ODPA had lower gas permeability with improved gas selectivity compared to those from the corresponding 4,4′-ODPA.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Xiangyu Bi,Yong’an Zhang,Feng Zhang,Shenxiang Zhang,Zhenggong Wang,Jian Jin
In the mixed matrix membrane (MMM), the interface between the filler and the polymer matrix will directly affect the gas separation performance of the membranes. Reasonable interfacial design in MMMs is thus important and necessary. In this work, metal–organic coordination interaction is used to construct the interface in metal–organic framework (MOF) nanosheet-based polyimide MMMs where ultrathin Co-benzenedicarboxylate MOF nanosheets (CBMNs) with a thickness less than 5 nm and a lateral size more than 5 μm are synthesized as fillers and a carboxyl-functionalized polyimide (6FDA-durene-DABA) is used as a polymer matrix. Because of the high aspect ratio (>1000) of CBMNs, abundant metal–organic coordination bonds are formed between Co2+ in CBMNs and the −COOH group in 6FDA-durene-DABA. As a result, the 6FDA-durene-DABA/CBMN MMMs exhibit improved separation performance for the CO2/CH4 and H2/CH4 gas pairs with H2/CH4 and CO2/CH4 selectivities up to 42.0 ± 4.0 and 33.6 ± 3.0, respectively. The enhanced interfacial interaction leads to the comprehensive separation performance of CO2/CH4 and H2/CH4 gas pairs approaching or surpassing the 2008 Robeson upper bound. In addition, the CO2 plasticization pressure of the MMMs is significantly enhanced up to ∼20 bar, which is 2 times that of the pure 6FDA-durene-DABA membrane. When separating a mixed gas of CO2/CH4, the selectivity of CO2/CH4 remains stable at around 23 and the CO2 permeability keeps around 400 barrer during the long-term test.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
MACROMOLECULES
·
2024
·
IF 5.1
Kai Geng,Tengyao Xue,Xiaodan Li,Haoqi Sang,Shichao Feng,Chenyi Wang,Hanli Wang,Yongbing Zhuang
In this study, a novel diamine monomer (BTPA) containing a benzocyclobutene (BCB) cross-linking site was synthesized, and two polyimides (PIs), PI-BCB-1 and PI-BCB-2, were synthesized using BTPA with dianhydrides, 4,4′-(hexafluoroisopropyl) diphenyl anhydride (6FDA) and 4,4′-(4,4-isopropylidenediphenoxy)bis(phthalic anhydride) (BPADA), respectively. The BCB-based PIs were soluble in common organic solvents and exhibited a desirable toughness. The cross-linking behavior of the BCB-based PIs was investigated using nonisothermal differential scanning calorimetry, and a mathematical model for the curing kinetics was established. Further, the effects of BCB cross-linking on the interchain packing, thermal performance, and gas transport properties of the PIs were thoroughly examined. The cross-linked PIs exhibited excellent heat resistance with glass-transition temperatures exceeding 400 °C. In addition, the CO2 and CH4 permeabilities for the cross-linked PI membranes increased 16- and 27-fold, respectively, compared with their counterparts before cross-linking. Remarkably, the CO2 permeability for PI-BCB-1 increased from 33 to 1559 Barrer after cross-linking, while maintaining a nearly unchanged CO2/CH4 selectivity of 35 (39 for its uncross-linked counterpart), surpassing the 2008 Robeson upper limit. In addition, the cross-linked PI membranes showed desirable aging resistance and excellent plasticization resistance. This study offers insights for designing PIs containing BCB side group-cross-linked units to enhance membrane-based gas separation performance.
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Changchun Wang,Xingming Jie,Guohui Xu,Lixin Li,Guangliang Song,Guodong Kang,Yiming Cao,Tianjun Sun,Yi Wei,Lina Wang
Thermally rearranged (TR) polymers are promising membrane materials due to their excellent gas permeability and thermal stability. Nevertheless, the harsh thermal rearrangement conditions (typically >400 °C) and limited intrinsic selectivity severely hinder their application for helium (He) recovery. Herein, we propose a synergistic Claisen rearrangement-crosslinking (CRX) strategy to address this issue. The He/CH 4 selectivity of the CRX hollow fibers increased from 59.47 in precursors to 120.51, corresponding to an enhancement of 102.6%. Moreover, SEM images revealed that 2D shrinkage mode effectively alleviated thermal densification, resulting in a ∼ 15% thinner skin layer. Consequently, the CRX-240-1 h-2D membranes achieved a higher He permeance of 281.66 GPU while maintaining excellent He/CH 4 selectivity. Importantly, under operating conditions of 70 °C and 0.5 MPa, CRX-240-1 h-2D membranes still maintained outstanding performance. Overall, this work provides an energy-efficient and reliable approach for the fabrication of TR hollow fiber membranes, showing great potential for helium recovery from natural gas.
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产品关联
DOI
高影响因子
Catalysts
·
2026
·Vol. 16
·期 7
·620
·
IF 4.5
Li Fang,Yuxian Jiang,Xueyang Jiang,Qin Zhang,Sihui Suo,Chenhui Zhao,Jiayu Song,Jiancong Liu
Oxygen vacancies are a key factor determining the efficiency of the CO2hydrogenation reaction and play a crucial role in CO2adsorption and activation. However, effectively regulating the concentration of oxygen vacancies to enhance the performance of the light-driven reverse water gas shift (RWGS) reaction remains a challenge. To address this, this study successfully developed Pt/TiO2catalysts with varying oxygen vacancy concentrations by controlling the morphology of TiO2. Structural characterization results indicate that, compared to Pt/TiO2-NR, Pt/TiO2-NB exhibits a higher oxygen vacancy (OV) concentration and greater CO2absorption. Catalytic performance evaluation results showed that under an irradiance of 2.5 W/cm2, the CO production rates of the Pt/TiO2-NB catalyst reached 57.03 mol·gPt−1·h−1. Furthermore, the catalyst maintained excellent catalytic stability during 45 h of continuous operation, demonstrating good potential for practical applications.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Jingwen Dong,Junjie Zhou,Shuguang Huang,Junmei Mu,Ye Tian,Zhifei Ding,Yihui Li,Aiping Wang,Zhanwei Zhou,Zeyu Xu,Minjie Sun
Near infrared light-triggered three-dimensional adaptive release in depth, time and dose for the treatment of diabetic foot ulcers. • A triphasic sequential NO release hydrogel achieves antibacterial, angiogenic and remodeling effects. • Triphasic sequential strategy for adapting NO dosage enhances the NO metabolic microenvironment at the wound condition, ultimately expediting wound healing. Diabetic foot ulcer (DFU) requires spatiotemporal coordinated modulation of the inflammatory response and tissue regeneration process, which is still the bottleneck. Here, a triphasic-sequential hydrogel was explored to tackle the infection treatment and tissue regeneration in DFU. The PDA@B6/L-Arg hydrogel was loaded with near infrared-responsive polydopamine nanoparticles, carrying the nitric oxide (NO) donors for different healing stages. Upon exposure to laser irradiation, 1) the PDA@B6/L-Arg hydrogel rapidly released a substantial amount of nitric oxide (NO) (μM) from N , N ′-di-sec-butyl-N,N′-dinitroso-1,4-phenylenediamine (BNN6), thereby synergistically achieving effective anti-bactericidal and anti-inflammatory effects; 2) L-Arg, as the substrate for nitric oxide synthases NOS, provided the support for deep angiogenesis; 3) the hydrogel degraded, allowing the released L-Arg to penetrate the wound and promote additional extracellular matrix remodeling. Compared to non-sequential NO therapy, PDA@B6/L-Arg hydrogel exhibited spatiotemporal modulation, enhancing the biofilm inhibition and angiogenesis. Furthermore, PDA@B6/L-Arg hydrogel, as a reactive oxygen species-scavenging agent, simultaneously attenuating inflammatory to improve the healing efficiency of chronic wounds, achieving 97.9% closure of infected wounds. It offers a promising therapeutic option for managing diabetic foot ulcers.
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产品关联
DOI
高影响因子
Nano Energy
·
2026
·
IF 16.7
Jiangdong Sun,Liang Xiao,Kuikui Xiao,Youtan Pan,Dong Cai,Shuo Yang,Xuemei Zhou,Huagui Nie,Zhi Yang
In situ tracking reveals the electrochemical decomposition pathway of Li 2 NiO 2 . • Metal doping stabilizes lattice oxygen and mitigates gas evolution. • Excellent cycling stability: 87% capacity retention at 1 C after 250 cycles. Li 2 NiO 2 (LNO) as a prelithiation additive faces critical challenges including poor rate capability (≤0.1 C), limited capacity, and gas evolution during cycling. Here, we report a metal-dopant lattice engineering strategy that simultaneously addresses these challenges through three synergistic mechanisms: (i) particle size reduction from 30 μm to 500 nm, shortening Li + diffusion pathways; (ii) b-axis lattice expansion (Δb/b ≈ 0.29%) and bandgap narrowing (from 1.2 eV to 0.6 eV), enhancing both ionic and electronic transport; and (iii) strengthened oxygen anchoring via short Cu–O bonds (1.885 Å), suppressing superoxide-related side reactions. Critically, this synthesis employs a one-step solid-state heat treatment using only conventional furnace equipment, directly compatible with existing production lines. The doped LNO (Li 2 Ni 0.9 Cu 0.1 O 2 , designated as LCNO) delivers an exceptional capacity of 492.1 mAh g⁻ 1 at 0.5 C (vs. 282.0 mAh g⁻ 1 for pristine LNO). When integrated into manufacturing-relevant NCM-811‖Si/C pouch cells activated under fast-formation protocols (2 h), LCNO delivers 87% capacity retention (vs. 80% for pristine LNO) after 250 cycles with suppressed gas evolution. Notably, this scalable doping strategy enables industrial manufacturing, bridging the gap from laboratory innovation to commercial production for high-performance prelithiation additives. Download: Download high-res image (163KB) Download: Download full-size image In this work, we report lattice engineering of Li 2 NiO 2 via metal doping (LCNO and LGNO), as the prelithiation, which enables scalable Li 2 NiO 2 prelithiation additives with fast kinetics, high capacity, and suppressed gas evolution. This scalable doping strategy enables industrial manufacturing, bridging the gap from laboratory innovation to commercial production for high-performance prelithiation additives.
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2026
·Vol. 37
·期 19
·1466
·
IF 3.2
Valabhoju Madhuker,Pothukanuri Nagaraju,Kathirvelu Velavan,Parne Saidi Reddy
Titanium-based metal–organic frameworks (Ti-BDC MOFs) were synthesized via a solvothermal route at different temperatures ranging from 110 to 170 °C using terephthalic acid as the organic linker. The synthesized samples were systematically characterized using X-ray diffraction (XRD), Raman spectroscopy, field emission scanning electron microscopy (FESEM), energy-dispersive X-ray spectroscopy (EDX), Fourier transform infrared spectroscopy (FTIR), ultraviolet–visible spectroscopy (UV–Vis), Brunauer–Emmett–Teller (BET) surface area analysis, and thermogravimetric analysis (TGA) to investigate their structural, morphological, optical, and thermal properties. X-ray diffraction (XRD) studies revealed temperature-dependent variations in crystallinity and phase evolution, while FESEM analysis demonstrated significant morphological transformations with increasing synthesis temperature. EDX confirmed the presence of Ti, O, and C elements, validating the successful formation of the Ti-BDC framework. FTIR spectra verified the coordination between Ti metal centers and BDC linkers, whereas TGA indicated good thermal stability with framework integrity maintained up to approximately 280 °C. Ultraviolet–visible studies were employed to determine the optical band gap, and BET analysis revealed the microporous and hierarchical porous nature of the synthesized materials. Gas sensing characteristics toward n-butanol were evaluated under ambient conditions using the static liquid distribution method. Among all samples, the Ti-BDC MOF synthesized at 150 °C exhibited the best sensing performance toward 5 ppm n-butanol, showing superior response–recovery behavior, excellent selectivity, and long-term stability, with a limit of detection (LOD) of 2.66 ppm. The enhanced sensing performance is attributed to the optimized crystallinity, porous architecture, and abundant active adsorption sites that facilitate efficient gas diffusion and charge transfer processes. These findings demonstrate the potential of Ti-BDC MOFs as promising sensing materials for low-concentration n-butanol detection in environmental monitoring and workplace safety applications.
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Hao Wang,Yunhua Lu,Pengwei Lv,Guoyong Xiao,Tonghua Wang,Lin Li
While conventional polymeric gas separation membranes are limited by the inherent permeability-selectivity trade-off, mixed matrix membranes (MMMs) often suffer from poor interfacial compatibility and non-selective void defects. Herein, rigid flaky polyimide (PI)-type covalent organic frameworks (COFs) were solvothermally synthesized using 2,4,6-triaminopyrimidine (TAP) and pyromellitic dianhydride (PMDA). The obtained COFs were adopted as functional fillers and blended into hydroxyl-containing polyimide (HPI) precursor derived from 2,2-bis(3-amino-4-hydroxyphenyl)hexafluoropropane (6FAP) and 4,4′-(hexafluoroisopropylidene)diphthalic anhydride (6FDA) to prepare thermally rearranged (TR) MMMs. The as-synthesized COFs possess excellent thermal stability, distinctive porous structure and moderate interfacial affinity with the polymer matrix, which effectively enhances the gas separation performance of the obtained membranes. At a PI-type COF loading of 2.0 wt%, the MMM treated at 450 °C for 1 h achieves superior separation performance. The permeabilities toward H 2 , CO 2 , O 2 and N 2 reach 2446, 2920, 495 and 131 Barrer, and the corresponding ideal selectivities of H 2 /N 2 , CO 2 /N 2 and O 2 /N 2 are 18.67, 22.29 and 3.77, respectively. Remarkably, the H 2 /N 2 separation behavior exceeds the 2008 Robeson upper bound, and CO 2 /N 2 as well as O 2 /N 2 separation performances are close to this limit. Elevated treatment temperature and extended heating time remarkably improve gas permeability but sacrifice membrane selectivity. Moreover, the fabricated MMMs display satisfactory anti-aging stability after 180-day ambient storage. This study develops a valid modification strategy via flaky PI-type COF incorporation to elevate the gas separation performance of TR polymers, providing a promising route for constructing high-efficiency gas separation membranes.
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DOI
高影响因子
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