SENSORS AND ACTUATORS B-CHEMICAL
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2024
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IF 8
Da Xu,Feng Sun,Hong Shao,Feng Liu,Qianli Ma,Wensheng Yu,Feng Li,Xiangting Dong
Metal oxide semiconductors (MOSs) are widely utilized in the gas-sensing field owing to their superior gas sensing performances. Herein, a hierarchical nanostructure consisting of Bi 2 MoO 6 nanosheets (NSs) assembled on LaFeO 3 nanofibers (NFs) was successfully synthesized by combining an electrospinning with a solvothermal method . The full study of the sensing performances was conducted by manufacturing commercial gas sensors based on Bi 2 MoO 6 /LaFeO 3 hierarchical nanostructure in order to showcase its potential application in gas sensing. The results show that the sensor based on Bi 2 MoO 6 /LaFeO 3 hierarchical nanostructure exhibits excellent HCHO gas sensing performances including a high response (R a /R g = 36.5), a superior selectivity and a short recovery time (τ rec = 20 s). Additionally, sensors based on Bi 2 MoO 6 NSs and LaFeO 3 NFs were also respectively fabricated to measure HCHO gas sensing performances in order to elucidate the sensing mechanism and structural superiority of the Bi 2 MoO 6 /LaFeO 3 hierarchical nanostructure. The increased capability of detecting HCHO gas can be attributed to the n-p heterostructure formed within the Bi 2 MoO 6 /LaFeO 3 hierarchical nanostructure. The findings in this work can contribute to the realization to enhance the sensing performances by designing n-p heterostructure in gas sensing material.
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CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Yang Li,Xuemei Diao,Peicheng Li,Panpan Liu,Yan Gao,Zhiyong Zhao,Xiao Chen,Ge Wang
To cope with the complex and changeable extreme environments, extending multifunctionality is crucial for potable smart wearable composite phase change materials (PCMs). Herein, we developed advanced Co/N co-doped carbon foam-based multifunctional “five-in-one” composite PCMs integrating dual-temperature thermal management, light-triggered heating, waterproof, flame retardant, and microwave absorption through high-temperature calcination of melamine foam@ZIF67 and melting encapsulation of paraffin wax (PW). Benefiting from the strong full-spectrum absorption, fast photon and phonon transport, and local surface plasmon resonance effect, our designed foam-based composite PCMs exhibited an ultrahigh photothermal conversion efficiency of 95.17 %. More importantly, foam-based composite PCMs demonstrated excellent thermal management, structural stability and thermal storage stability after undergoing 300 heating–cooling cycles. Furthermore, foam-based composite PCMs showed superior microwave absorption (RL min = -57.93 dB), good flame retardancy and satisfactory hydrophobicity (contact angle > 100°). Thus, our developed multifunctional foam-based composite PCMs provide great potential for personalized thermal management and anti-radiation smart wearables even in harsh environments (e.g., rain, snow, sweat, fire, extreme cold, extreme heat and electromagnetic interference), creating a versatile platform for smart wearable light-triggered phase change heater with on-demand properties.
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DYES AND PIGMENTS
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2024
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IF 4.1
Xiaochen Zhu,Haiyan Qi,Tao Jing,Jun Li,Ming Zhao,Jiayu Zhang,Chao Luo,Maoxia Ran
4-Hydroxybenzoic acid is one of the important metabolism biochemical markers of the urine in gastric cancer patients. In this work, a fluorescence sensor based on N,S-doped carbon dots conjugated molecular imprinting polymers (N,S-CDs@SiO 2 @MIPs) was prepared to detect4-hydroxybenzoic acid. The novel fluorescence sensor in response to 4-hydroxybenzoic acid ranged from 0 to 100 μmol/L, with a detection limit of 1.27 μmol/L. Furthermore, 4-hydroxybenzoic acid demonstrated strong fluorescence quenching capability on our fluorescence sensor, with the fluorescence quenching mechanism involving a combined effects of dynamic quenching and electron transfer. Lastly, the N,S-CDs@SiO 2 @MIPs were applied to analyze 4-hydroxybenzoic acid inhuman urine samples with high accuracy. The findings showed that N,S-CDs@SiO 2 @MIPs sensor might have high potential for effectively, selectively, accurately diagnosing gastric cancer patients.
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JOURNAL OF MOLECULAR CATALYSIS B-ENZYMATIC
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2012
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IF 2.735
Xinjiong Fan,Xiaolong Liu,Yuhuan Liu
A novel gene (designated as est816 ) encoding an esterase was isolated from a Turban Basin metagenomic library with a functional screening method. Sequence analysis revealed that est816 encoded a protein of 271 amino acids with a predicted molecular mass (Mr) of 29.9 kDa and was expressed in Escherichia coli BL21 (DE3) in soluble form. The optimum pH and temperature of the recombinant Est816 were 7.5 and 60 °C, respectively. The enzyme was stable in the pH range of 5.0–9.0 and at temperatures below 50 °C. The residual activity of Est816 was 47.7% when stored at 25 °C for 5 months. The enzyme could hydrolyze a wide range of ρ-nitrophenyl esters, but its best substrate is ρ-nitrophenyl acetate with the highest activity (364 U/mg). It could also degrade medium to long-chain AHLs at the concentration of 1 mM in half an hour with more than 90% degradation efficiency. This is the first report to construct one metagenomic library from Turban Basin to obtain one esterase, which belongs to family V esterases/lipases and has AHL-lactonase activity. The recombinant enzyme displayed broad substrate spectrum, high activity and thermostability. These excellent properties make it an attractive enzyme for quorum quenching.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2012
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IF 2.237
Rulong Li,Huabin Xing,Qiwei Yang,Xu Zhao,Baogen Su,Zongbi Bao,Yiwen Yang,Qilong Ren
This paper presents an extensive study on the feasibility of ionic liquids (ILs) for the extractive separation of a 1-hexene/n-hexane mixture. Seventeen ILs were tested at 313 K. The extraction selectivities of 1-hexene to n-hexane were in the range 1.5–3.0. The chemical structures of anion and cation in ILs greatly affected the extraction, and the functional groups, such as carbon–carbon double bond, nitrile, ester, and amide, in the ILs led to higher selectivities. The increase of alkyl chain length in cation led to the increase of extraction capacity of 1-hexene. To increase the distribution of 1-hexene in IL phase, silver salt was added to the ILs. It was found that ILs containing silver salt had a high distribution of 1-hexene, as well as high selectivity of 1-hexene against n-hexane. The extraction efficiency increased with the concentration of silver salt in ILs. When the initial feed concentration of 1-hexene was smaller, the selectivity of 1-hexene to n-hexane was higher. A simple mathematical model has been developed to describe the total 1-hexene content in the reaction media under study, on the basis of the formation of complexes between silver and 1-hexene with different stoichiometry. This work proves that the ILs can act as effective extractants in 1-hexene/n-hexane separation.
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ANALYTICA CHIMICA ACTA
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2024
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IF 5.7
Jun-Yi Zhou,Yan-Qing Chen,Guang Hu,Haiyu Zhao,Jian-Bo Wan
Background N-acylethanolamines (NAEs) are a class of naturally occurring bioactive lipids that play crucial roles in various physiological processes, particularly exhibiting neuroprotective and anti-inflammatory properties. However, the comprehensive profiling of endogenous NAEs in complex biological matrices is challenging due to their low abundance, structural similarity and the limited availability of commercial standards. Here, we propose an integrated strategy for comprehensive profiling of NAEs that combines chemical derivatization and a three-dimensional (3D) prediction model based on quantitative structure-retention time relationship (QSRR) using liquid chromatography coupled with high-resolution tandem mass spectrometry (LC-HRMS). Results After acetyl chloride (ACC) derivatization, the detection sensitivity of NAEs was significantly improved. We developed a QSRR prediction model to construct an in-house database for 141 NAEs, encompassing information on RT, MS 1 ( m/z ), and MS/MS spectra. Propargylamine-labeled fatty acids were synthesized as RT calibrants across various analytical conditions to enhance the robustness of the RT prediction model. NAEs in biological samples were then in-depth profiled using parallel reaction monitoring (PRM) acquisition. This integrated strategy identified and annotated a total of 50 NAEs across serum, hippocampus and cortex tissues from a 5xFAD mouse model of Alzheimer's disease (AD). Notably, the levels of polyunsaturated NAEs, particularly NAE 20:5 and NAE 22:6, were significantly decreased in 5xFAD mice compared to WT mice, as confirmed by accurate quantitation using ACC- d 0 / d 3 derivatization. Significance Our integrated strategy exhibits great potential for the in-depth profiling of NAEs in complex biological samples, facilitating the elucidation of NAE functions in diverse physiological and pathological processes.
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ANALYTICA CHIMICA ACTA
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2024
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IF 5.7
Yuanyuan Li,Huinan Chen,Rong Huang,Dongmei Deng,Xiaoxia Yan,Liqiang Luo
Backgroud The global prevalence of diabetes mellitus, a serious chronic disease with fatal consequences for millions annually, is of utmost concern. The development of efficient and simple devices for monitoring glucose levels is of utmost significance in managing diabetes. The advancement of nanotechnology has resulted in the indispensable utilization of advanced nanomaterials in high-performance glucose sensors. Modulating the morphology and intricate composition of transition metals represents a viable approach to exploit their structure/function correlation, thereby achieving optimal electrocatalytic performance of the synthesized catalysts. Results Herein, a sensitive and rapid Cu-encapsulated Cu 2 S@nitrogen-doped carbon (Cu@Cu 2 S@N–C) hollow nanocubes-functionalized microfluidic paper-based analytical device (μ-PAD) was fabricated. Through a delicate sacrificial template/interface technique and thermal decomposition, inter-connected hollow networks were formed to boost the active sites, and the carbon shell was coated to protect Cu from being oxidation . For application, the constructed μ-PAD is used for glucose sensing utilizing an origami automated sample pretreatment system enabled by a simple application of strong alkaline solution on wax paper. Under optimal circumstances, the Cu@Cu 2 S@N–C electrochemical biosensor exhibits broad detection range of 2–7500 μM (R 2 = 0.996) with low detection limit of 0.16 μM (S/N = 3) and high sensitivity of 1996 μA mM −1 cm −2 . Additionally, the constructed μ-PAD also exhibited excellent selectivity, stability, and reproducibility. Significance By rationally designing the double-shell hollow nanostructure and introducing Cu-encapsulated inner layer, the synthesized Cu@Cu 2 S@N–C hollow nanocubes show large specific surface area , short diffusion channels, and high stability. The proposed origami μ-PAD has been successfully applied to serum samples without any additional sample preparation steps for glucose determination, offering a new perspective for early nonenzymatic glucose diagnosis.
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Journal of Materials Chemistry A
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2024
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IF 10.7
Simin Li,Yinghong Xu,Zhiwei Li,Shengliang Zhang,Hui Dou,Xiaogang Zhang
Ionic thermoelectric (i-TE) materials, based on the thermodiffusion effect, have demonstrated great potential due to their exceptional heat-to-electricity properties, low cost, and flexibility. However, a comprehensive understanding of ion transport mechanism and interaction between ion and the polymer matrix is still in its early stage. In this work, we developed a functional i-TE material with hierarchical pathways for anion by employing an interpenetrating polymer network composed of sodium polystyrene sulfonate modified polyvinyl alcohol. Notably, such specific pathway integrates coordination and electrostatic interactions between cations and functional groups, resulting in an n-type behavior of i-TE hydrogel with enhanced anion diffusion efficiency. The developed i-TE system achieves a high thermopower of −16.8 mV K−1 and an output power density of 47.8 mW m−2 at a temperature difference of 10 K. Moreover, the constructed device demonstrates high sensitivity and responsivity to varying heat input, which provides valuable insights for the design and development of potential i-TE materials and devices for low-grade heat conversion.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
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IF 8.1
Yijun Luo,Zhendong Liu,Jincheng Liu,Wei Cai,Zewei Liao,Xuyang Feng,Jia Zheng,Chengzhi Zhang,Yanxiong Fang
The photocatalytic efficiency of graphitic carbon nitride (g-C 3 N 4 ) in hydrogen production is primarily hindered by its poor absorption of visible light , rapid recombination of electron-hole pairs, and the absence of hydroxyl radical formation. Herein, a novel g-C 3 N 4 nanosheets functionalized with sulfonic acid groups were effectively produced through thermal polymerization of melamine and 2, 4-diamino-6-phenyl-1, 3, 5-triazine (DPT), followed by sulfonation treatment. The introduction of the phenyl group brings about alterations to the initial symmetrical arrangement of g-C 3 N 4 , leading to the disruption of certain hydrogen bonds . This, in turn, facilitates the movement of electrons from the n to π* orbitals, resulting in enhanced light absorption and improved efficiency in charge separation. Moreover, it induces modifications to the band structure and amplifies the production of hydroxyl radicals. Additionally, the introduction of sulfonic acid enhances the water affinity and the ability of dispersing graphitic carbon nitride in water. The optimized sulfonated benzene-substituted g-C 3 N 4 (1000-BCN-SO 3 H) with a melamine to DPT ratio of 4:1 exhibits a maximum hydrogen production rate of 6.52 mmol·h −1 ·g −1 under simulated sunlight irradiation with good cycling stability, which is 3.93 times higher than that of g-C 3 N 4 nanosheets . This research offers a promising opportunity for a novel approach in advancing carbon nitride materials for effective photocatalytic processes.
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JOURNAL OF POWER SOURCES
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2017
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IF 6.395
Shumin Wang,Lei Zhang,Yong Qin,Dong Ding,Yunfei Bu,Fuqiang Chu,Yong Kong,Meilin Liu
Co and N co-doped carbon (CNC) material is one of the most promising precious-metal-free catalyst for hydrogen evolution reaction (HER), however, widespread application of CNC will require continuous innovation and optimization of fabrication to maximize electrocatalytic performance, which is always a challenge. Herein, two types of three-dimensional (3D) graphene materials synthesized by one-step of simultaneous doping (Co,N/3DG-1) and two-step of sequential doping (Co,N/3DG-2) respectively, are evaluated and correlated their electrocatalytic activity for HER with experimental parameters. The results indicate that Co,N/3DG-2 exhibits significantly better electrocatalytic activity than Co,N/3DG-1. The structure analysis reveals that Co,N/3DG-2 has more moderate Co-N coordinated number than Co,N/3DG-1. Density functional theory calculations unravels that the equilibrium C and N around Co atom is more favorable to the adsorption and desorption of hydrogen. The results shed new light on the rational design of dual hetero-atom co-doped carbon materials, which may be applicable to other energy conversion and storage systems.
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CARBOHYDRATE POLYMERS
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2017
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IF 4.811
Guoguang Wei,Alei Zhang,Kequan Chen,Pingkai Ouyang
This study presents an efficient pretreatment of crayfish shell using high pressure homogenization that enables N -acetyl- d -glucosamine (GlcNAc) production by chitinase. Firstly, the chitinase from Serratia proteamaculans NJ303 was screened for its ability to degrade crayfish shell and produce GlcNAc as the sole product. Secondly, high pressure homogenization, which caused the crayfish shell to adopt a fluffy netted structure that was characterized by Scanning electron microscope (SEM), Fourier transform infrared spectrometer (FT-IR), X-ray diffraction (XRD), was evaluated as the best pretreatment method. In addition, the optimal conditions of high pressure homogenization of crayfish shell were determined to be five cycles at a pressure of 400 bar, which achieved a yield of 3.9 g/L of GlcNAc from 25 g/L of crayfish shell in a batch enzymatic reaction over 1.5 h. The results showed high pressure homogenization might be an efficient method for direct utilization of crayfish shell for enzymatic production of GlcNAc.
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SOLID STATE SCIENCES
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2024
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IF 3.4
Zhan Tian,He Wang,Guoqiang Li,Hongrui Jia,Guoxin Zhang
NiFe 2 O 4 has emerged as an efficient oxygen evolution reaction (OER) electrocatalyst, with outstanding stability in alkaline media and excellent redox properties. In order to further improve the catalytic performance, thinly-walled NiFe 2 O 4 nanotubes (NiFe 2 O 4 -NTs), efficiently derivable from Ni, Fe, N-codoped carbon nanofibers, were innovatively synthesized through a sequential route combing hydrothermal, electrospinning, and high-temperature sintering in this work. The NiFe 2 O 4 -NTs possess large diameter of around 120 nm and their thickness of the tube wall is only about 10 nm. The surface properties of NiFe 2 O 4 can be adjusted by forming the Ni-N/Fe-N bonds. Excitingly, largely exposed active surface area and boosted catalytic reaction kinetics toward oxygen evolution reaction are realized. The required overpotential to deliver 10 mA cm −2 is only 331 mV, accompanied with favorable Tafel slope of only 51.8 mV dec −1 , small charge transfer resistance, and superior reaction stability.
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