JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Zhiying Li,Zhiwei Li,Ning Zhang,Junjiang Bao,Xiaopeng Zhang,Gaohong He,Cong Chen,Yongchen Song
Ultrathin and defect-free MOF membranes are actively pursued to realize high-performance hydrogen purification and carbon capture, which are of great significance for energy conservation and environmental sustainability. Zeolitic imidazolate framework-67 (ZIF-67) possesses exceptional pore apertures for sieving hydrogen from other larger gases. However, the preferential heterogeneous nucleation and growth of ZIF-67 crystals greatly challenge the synthesis of ZIF-67 membranes. In this work, a tunable-reaction-zone contra-diffusion synthesis is proposed to effectively assemble ZIF-67 nanocrystals into ultrathin GO laminates. The contra-diffusion-match growth of ZIF-67 constructs a compact ZIF-67@GO hybrid structure with superior H 2 /CO 2 separation factor of 140.8 and H 2 permeance of 1.7 × 10 −7 mol m −2 s −1 Pa −1 , transcending the state-of-art upper bounds. The excellent separation performance is attributed to the collaborative effect of the size-sieving and the selective attraction of the ZIF-67@GO hybrid structure. Long-term operation also reveals the superior stability of the ZIF-67@GO hybrid membrane for H 2 /CO 2 separation. The rational-design approach grants a novel way to fabricate ultrathin and defect-free ZIF-67 crystalline membranes for high-performance gas separation.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 30
·14363-14374
·
IF 3.925
Jun Li,Yongjiao Sun,Zhaomin Tong,Zhenting Zhao,Wendong Zhang,Jie Hu,Lin Chen
Morphology control and noble-metal modification have become effective ways to improve the gas sensing performances of mixed-metal-oxide sensors. In this study, ZnSnO3 nanocube structures with different morphologies were synthesized via combining NaOH-assisted dissolution and a calcination process, and they were then modified with various amounts of Au nanoparticles through a chemical reduction method. Some important parameters were systematically investigated to optimize the gas sensing performance toward toluene detection. Noticeably, the as-prepared Au2NPs@ZnSnO3 hollow nanocube sensor exhibits an ultra-high response (80.82@100 ppm), fast response and recovery times (11 s/12 s, respectively), a low limit of detection (10 ppb), excellent repeatability, long-term stability, and good anti-humidity properties. The enhanced gas sensing mechanism of the Au2NPs@ZnSnO3 sensor is also thoroughly discussed, which can be attributed to the unique hollow nanocube structure and the excellent electron sensitization and chemical sensitization properties of AuNPs. As a result, the optimum AuNP-modified ZnSnO3 sensing material is promising for high-sensitivity toluene detection for practical applications.
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NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 29
·12945-12956
·
IF 3.591
Zhenghui Yang,Haiquan Guo,Chuanqing Kang,Lianxun Gao
A series of polymer substrates based on the polyimides (PIs) containing diphenylpyridine for flexible OLED displays were successfully fabricated by the incorporation of graphene oxide (GO) and organically modified layered double hydroxide (OLDH) nanosheets. In comparison with pristine PI, the OTR and WVTR of PI nanocomposite films at a loading of 3% OLDH were reduced by 78% and 25.7%, respectively, whereas by incorporation of 0.3% GO, the OTR and WVTR of PI nanocomposite films declined by 85.5% and 31.8%, respectively. The results revealed that GO nanosheets could have a great advantage over OLDH from the aspect of improving the gas barrier performance. Moreover, compared with the pristine PI films (CTE: 4.73 ppm K−1), the incorporation of GO and OLDH nanosheets was of great benefit in reducing the CTE value, such as 1.57 ppm K−1 for PIL-3.0 and 3.33 ppm K−1 for PIG-0.3, while maintaining high Tg values exceeding 450 °C and excellent thermal stability. The resulting PI nanocomposite films showed improved barrier properties without sacrificing the thermal and mechanical performance, and could serve as a promising candidate for substrate materials of flexible OLED displays.
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高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2021
·
IF 3.927
Qian Ma,Hang Li,Jia Guo,Shushu Chu,Qi Zhang,Ziqiong Lin
Porous SnO 2 /NiO hollow nanofibers with effective surface transmission behavior have been prepared through a facile modified electrospinning method . The introduction of Ni component into the precursor solution can not only regulate the morphological evolution together with the nucleation and crystallization of oxide heterostructures at the elevated temperature action, but also significantly contribute to the enhancement of the gas-sensing performance for testing n-butanol gas. SnO 2 /NiO composites can present the highest response of 199 at the optimum operating temperature of 280 °C toward 100 ppm n-butanol gas, which is 4.5 times than that of pure SnO 2 nanofibers. Meanwhile, the response/recovery times of the sensors can be immensely decreased from 57/16 s of pure sample to 36/10 s as the adding amount of Ni component increasing to 5%, along with the superior selectivity and long-term stability toward n-butanol. The excellent gas-sensing properties of the sensors can be mainly attributed to the flourishing porous one-dimensional (1D) microstructure containing the closely connected p-n heterojunctions of SnO 2 and NiO, which can provide large specific surface areas with a mass of active sites to promote the reaction between n-butanol molecule and O δ− on the surface.
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高影响因子
MEASUREMENT SCIENCE and TECHNOLOGY
·
2021
·Vol. 33
·期 3
·035102
·
IF 2.046
Sijie He,Yushan Liu,Wenlin Feng,Bangxing Li,Xiaozhan Yang,Xinyue Huang
A carbon monoxide (CO) sensor based on a Michelson interferometer combined with α-Fe2O3/reduced graphene oxide quantum dots (rGOQDs) composite film is proposed and fabricated. First, a waist-enlarged taper is formed between the single-mode fiber (SMF) and the no-core fiber (NCF), then the other end of the NCF is spliced with a section of thin-core fiber (TCF). The end of the TCF is coated with a layer of silver film to enhance the reflection. Thus, a Michelson interferometer comprising SMF–NCF–TCF is formed. The α-Fe2O3/rGOQDs composite film is deposited on the outside surface of the TCF. The specific adsorption of CO by the composite film leads to a change in the sensor's effective refractive index, realizing the detection of CO. The results show that the interference intensity of the monitoring valley decreases with increase in the concentration of CO. The sensitivity of the sensor is 0.057 dBm ppm−1, the detection limit of the sensor is 105 ppb and the response time and recovery time are 70 s and 100 s, respectively. The sensor has the advantages of high sensitivity, high selectivity and simple structure, and it is expected to be used for the detection of low concentrations of CO gas.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Ningyi Wang,Wei Tao,Nan Zhang,Tianshuang Wang,Xiaolong Wang,Fangmeng Liu,Xu Yan,Fengmin Liu,Xishuang Liang,Peng Sun,Geyu Lu
Microwave gas sensor (MGS), being as a kind of new-developed sensing device, possesses the ability to resolve the poor stability, imprecise selectivity, slow response speed and other problems plaguing room-temperature gas sensors. However, the nature of gas sensing mechanism of MGS has not yet been revealed, and the sensitive materials currently applied on MGS are relatively unstable and insensitive under high humidity. Here we have for the first time reported a highly sensitive, selective, and stable MGS composed of ultra-narrowband microwave filter transducer and organic-inorganic hybrid sensitive material (multilayered structured polyaniline (PANI)-SnO 2 ). Owing to the standout capacity of ammonia (NH 3 ) adsorption, the high resistance to water poisoning, and the efficient tuning of relative permittivity ascribed to p-n (PANI-SnO 2 ) heterojunction , the organic-inorganic hybrid based MGS operating at room-temperature can selectively detect low concentration of NH 3 with high sensitivity, fast response speed, and anti-humidity capacity, which has never been reported before. This work develops a new class of microwave sensing functional materials, and demonstrates that the concept in tuning relative permittivity for constructing outstanding performance microwave gas sensor.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Qiang Liu,Bingsi Liu,Qinze Liu,Shitong Guo,Xuanyue Wu
Developing structurally stable sorbents for high-temperature H 2 S direct removal is recognized as a valuable energy-saving strategy for efficient utilization of hot coal gas (HCG), which depends upon their mesoporous features and desulfurization capabilities. Herein, tailored hierarchical Ca x Cu y Mn z O i /MAS-9 sorbents were fabricated via a facile sol–gel method using high-activity phase Ca x Cu y Mn z O i anchored onto versatile mesoporous MAS-9. After O/S-exchange procedure, noteworthy straight channels of MAS-9 ( S BET = 808 m 2 g −1 ) provided enough available spaces for the storage of generative large MeS y nanoparticles, which was better than other conventional zeolites. The probing of variables ( i.e. support type, active ingredient, loadings, and sulfidation temperature) on H 2 S removal revealed that 50%Ca 3 Cu 10 Mn 87 O i /MAS-9 shared an excellent breakthrough sulfur capacity (171.57 mg g −1 ) at 800 °C, even it experienced six reusable cycles, due to synergistic stabilizing effect of Ca-Cu-Mn and high-temperature tolerance of Si O Al framework of MAS-9. Especially, CaO dopant endowed the sorbent with superficial alkalinity and high-temperature resistance. The brilliant desulfurization behavior was also described by the fast H 2 S diffusion or component deactivation vs . duration time on stream according to the followed kinetic investigation. Thus, the refined Ca 3 Cu 10 Mn 87 O i /MAS-9 possesses the expected representative desulfurization nature and great potentiality for raw HCG in practical applications.
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高影响因子
International Journal of Nanomedicine
·
2024
·
IF 6.6
Junjuan Li,Yue Tian,Qi Qin,Zhaolei Ding,Xue Zhao,Wei Tan
Purpose: Owing to its noninvasive nature, broad-spectrum effectiveness, minimal bacterial resistance, and high efficiency, phototherapy has significant potential for antibiotic-free antibacterial interventions and combating antibacterial biofilms. However, finding effective strategies to mitigate the detrimental effects of excessive temperature and elevated concentrations of reactive oxygen species (ROS) remains a pressing issue that requires immediate attention.Methods: In this study, we designed a pH-responsive cationic polymer sodium nitroside dihydrate/branched polyethylenimine–indocyanine green@polyethylene glycol (SNP/PEI-ICG@PEG) nanoplatform using the electrostatic adsorption method and Schiff’s base reaction. Relevant testing techniques were applied to characterize and analyze SNP/PEI-ICG@PEG, proving the successful synthesis of the nanomaterials. In vivo and in vitro experiments were performed to evaluate the antimicrobial properties of SNP/PEI-ICG@PEG.Results: The morphology and particle size of SNP/PEI-ICG@PEG were observed via TEM. The zeta potential and UV-visible (UV‐vis) results indicated the synthesis of the nanomaterials. The negligible cytotoxicity of up to 1 mg/mL of SNP/PEI-ICG@PEG in the presence or absence of light demonstrated its biosafety. Systematic in vivo and in vitro antimicrobial assays confirmed that SNP/PEI-ICG@PEG had good water solubility and biosafety and could be activated by near-infrared (NIR) light and synergistically treated using four therapeutic modes, photodynamic therapy (PDT), gaseous therapy (GT), mild photothermal therapy (PTT, 46 °C), and cation. Ultimately, the development of Gram-positive (G+) Staphylococcus aureus (S. aureus) and Gram-negative (G−) Escherichia coli (E. coli) were both completely killed in the free state, and the biofilm that had formed was eliminated.Conclusion: SNP/PEI-ICG@PEG demonstrated remarkable efficacy in achieving controlled multimodal synergistic antibacterial activity and biofilm infection treatment. The nanoplatform thus holds promise for future clinical applications.
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PubMed
高影响因子
FUEL
·
2024
·
IF 6.7
Peiyong Ma,Bowen Li,Rui Diao,Xiaohao Liu,Zhusong Cheng,Fenglei Qi
Biomass as the only carbon-bearing renewable energy has enormous potential to challenge the established energy structure dominated by fossil resources, and incineration technology is one of the most direct and efficient pathways for utilizing biomass resources, unfortunately enduring the inevitable sintering and slagging problems owing to the excessive alkali metals. Herein, we comparatively investigated the effects of five leaching solvents (water, acetic acid, wood vinegar, hydrochloric acid, and oxalic acid) on the physicochemical properties and ash-removal capabilities of wheat straw (WS) and rice husk (RH), with a view to achieving better performance in the subsequent combustion characteristics, kinetic examination, flue gas, and slag evolution. Results indicated with ionization ability increased (water < acetic acid < hydrochloric acid), the WS exhibited a strong demineralization performance (maximum 61.1%), further leading to a steep weight loss in its combustion characteristic curve at approximately 350 °C and a delayed peak temperature after the removal of alkali metal. Multiple distributed activation energy model and sensitivity analysis revealed that leaching pretreatment enhanced the activation energy (189–191.8 kJ mol −1 ) and optimized energy distribution at the preliminary stage of the combustion reaction. In addition, the absence of alkali metals suppressed the catalytic oxidation reaction in the flue gas, remarkably limiting the formation of CO 2 but facilitating the release of CO and CH 4 . Meanwhile, a considerable optimal in biomass ash slagging, in which the initial temperature of the liquid phase slag for WS ash increased to 991 °C. Notably, HCl showed the strongest demineralization performance among the five leaching solvents during pretreatment, but the high-temperature slag content was still higher than that of acetic acid. Therefore, slagging performance is not only associated with the demineralization ability of leaching solvents, but also with ash composition.
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高影响因子
ChemPlusChem
·
2025
·
IF 2.8
Yufei Liang,Tingting Zhao,Shuanjin Wang,Dongmei Han,Sheng Huang,Wei Liu,Hui Guo,Min Xiao,Yuezhong Meng
As the sole commercial polycarbonate derived from CO2, poly(propylene carbonate) (PPC) is still hindered by poor thermal stability and a low glass transition temperature. Hererin, we first report the terpolymerization of CO2, propylene oxide (PO) and epichlorohydrin (ECH) to synthesize PPC-ECH terpolymers via one-pot and metal-free method using multi-nuclear organoboron catalysts. The PPC-ECH terpolymers with well-rounded properties can be easily synthesized by adjusting reaction conditions, monomer ratios, catalyst types and loading. The molecular weight of the PPC-ECH terpolymer can reach up to 59.4 kg/mol, which is the highest known. Notably, the synthesized PPC-ECH exhibits outstanding barrier performance with oxygen permeability as low as 1.31 cm3·mm/(m2·day) and water vapor permeability as low as 0.016 g·mm/(m2·day), significantly lower than those of pure PPC or other common packaging materials. Importantly, the introduction of a small amount of ECH not only preserves the biodegradability of polycarbonate but also markedly enhances its mechanical properties, glass transition temperature, thermal stability and flame retardancy, offering promising prospects for application in packaging materials.
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产品关联
DOI
PubMed
高影响因子
Foods
·
2022
·Vol. 11
·期 24
·4109
·
IF 5.561
Yue Zhang,Suyoung Kang,Han Yan,Dongchao Xie,Qincao Chen,Haipeng Lv,Zhi Lin,Yin Zhu
Wuyi rock tea (WRT) is one of the most famous subcategories of oolong tea, exhibiting distinct aroma characteristics with the application of different cultivars. However, a comprehensive comparison of the characteristic volatiles among WRTs with different cultivars has rarely been carried out. In this study, non-targeted analyses of volatile fragrant compounds (VFCs) and targeted aroma-active compounds in WRTs from four different cultivars were performed using chemometrics and gas chromatography olfactometry/mass spectrometry (GC-O/MS). A total of 166, 169, 166, and 169 VFCs were identified for Dahongpao (DHP), Rougui (RG), Shuixian (SX), and Jinfo (JF), respectively; and 40 components were considered as the key differential VFCs among WRTs by multivariate statistical analysis. Furthermore, 56 aroma-active compounds were recognized with predominant performances in “floral & fruity”, “green & fresh”, “roasted and caramel”, “sweet”, and “herbal” attributes. The comprehensive analysis of the chemometrics and GC-O/MS results indicated that methyl salicylate,p-cymene, 2,5-dimethylpyrazine, and 1-furfurylpyrrole in DHP; phenylethyl alcohol, phenethyl acetate, indole, and (E)-β-famesene in RG; linalool, phenethyl butyrate, hexyl hexanoate, and dihydroactinidiolide in JF; and naphthalene in SX were the characteristic volatiles for each type of WRT. The obtained results provide a fundamental basis for distinguishing tea cultivars, recombination, and simulation of the WRT aroma.Keywords:characteristic volatiles;cultivars;aroma-active compounds;GC-O/MS;multivariate statistical analysis;Wuyi rock teas
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PubMed
高影响因子
Journal of the American Chemical Society
·
2022
·
IF 16.383
Lingqiang Zhou,Zheyi Liu,Yongjie Guo,Shiwen Liu,Heng Zhao,Shan Zhao,Chunlei Xiao,Shun Feng,Xueming Yang,Fangjun Wang
Maintaining the protein high-order structures and interactions during the transition from aqueous solution to gas phase is essential to the structural analysis of native mass spectrometry (nMS). Herein, we systematically interrogate the effects of charge state and crown ether (CE) complexation on the gas-phase native-like protein structure by integrating nMS with 193 nm ultraviolet photodissociation (UVPD). The alterations of photofragmentation yields of protein residues and the charge site distribution of fragment ions reveal the specific sites and sequence regions where charge and CE take effect. Our results exhibit the CE complexation on protonated residues can largely alleviate the structure disruption induced by the intramolecular solvation of charged side chains. The influences of CE complexation and positive charge on gas-phase protein structure exhibit generally opposite trends because the CE microsolvation avoids the hydrogen-bonding formation between the charged side chains with backbone carbonyls. Thus, CE complexation leads to a more stable and native-like protein structure in the gas phase.
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PubMed
高影响因子
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