Advanced Healthcare Materials
·
2021
·Vol. 10
·期 18
·2100046
·
IF 9.933
Ya-Lei Li,Yan-Hua Liu,Lin-Sen Chen,Jian-Long Xu
Monitoring the concentration of useful biomarkers via electronic skins (e-skins) is highly important for the development of wearable health management systems. While some biosensor e-skins with high flexibility, sensitivity, and stability have been developed, little attention has been paid to their long-term comfortability and optical transparency. Here, a conformable, gas permeable, and transparent skin-like Cu 2 O@Ni micromesh structural glucose monitoring patch is reported. With its self-supporting micromesh structure, the skin-like glucose monitoring patch exhibits excellent shape conformability, high gas permeability, and high optical transmittance. The skin-like glucose biosensor achieves real-time monitoring of glucose concentrations with high sensitivity (15 420 µA cm − 2 mM − 1 ), low detection limit (50 nM), fast response time (＜2 s), high selectivity, and long-term stability. These desirable performance properties arise from the synergistic effects of the self-supporting micromesh configuration, high conductivity of the metallic Ni micromesh, and high electrocatalytic activities of the Cu 2 O toward glucose. This work presents a versatile and efficient strategy for constructing conformable, gas permeable, and transparent biosensor e-skins with excellent practicability towards wearable electronics.
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PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Han Bi,Le-Xi Zhang,Yue Xing,Peng Zhang,Jing-Jing Chen,Jing Yin,Li-Jian Bie
Recently, the influence of polar facets on the gas sensing performance of metal oxides has drawn much attention, yet the facet-dependent gas sensing properties of rare earth oxides have not been reported so far. In this work, taking CeO 2 as an example, uniform single-crystalline nanopolyhedra, nanorods and nanocubes of cubic CeO 2 were selectively prepared by a hydrothermal method at different temperatures and NaOH concentrations, using Ce(NO 3 ) 3 as the cerium source. According to X-ray powder diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM) analysis, these CeO 2 nanocrystals possess different exposed crystal planes: {111} and {100} for nanopolyhedra, {110} and {100} for nanorods, and {100} for nanocubes. Abundant defects were confirmed on the surface of three CeO 2 nanocrystals by X-ray photoelectron spectroscopy (XPS), electron paramagnetic resonance (EPR) and photoluminescence (PL). Notably, gas sensors based on these three CeO 2 nanocrystals exhibited distinct response values towards dimethylamine vapor in the following order: nanocubes > nanorods > nanopolyhedra, while excluding the effects of characteristic dimension and specific surface area. The response order of CeO 2 nanocrystals is primarily ascribed to the different content of surface defects and {100} polar facets instead of {111} and {110} nonpolar facets.
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高影响因子
POLYMER TESTING
·
2020
·
IF 3.275
Lidong Feng,Sheng Xiang,Yanlong Liu,Xinchao Bian,Gao Li,Xuesi Chen
An analytical method was developed to quantitatively determine residual monomers, namely, lactide (LA) and ε -caprolactone (CL), in poly(lactide- co - ε -caprolactone) (PLCL) using an internal-standard method of gas chromatography (GC). PLCL and diphenyl ether (DPE) as an internal standard were initially dissolved in dichloromethane (DCM), and then PLCL was precipitated in cyclohexane. The residual LA and CL monomers in PLCL, as well as DPE, were extracted into cyclohexane from the polymer solution. The resulting solution was directly injected into a GC system. This method was practical for measuring the residual LA and CL contents in PLCL. The relative standard deviation ( RSD ) ( n = 5) denoting the repeatability of this method was less than 5.6% and 4.3% for the LA and CL measurements, respectively, indicating that the method was sufficiently precise. The recovery rate of standard addition was 96.5%–101.5% and 98.4%–104.2% for the determination of LA and CL in PLCL, respectively. The RSD of the recovery of standard addition ( n = 5) was not more than 2.0%, indicating that the method was sufficiently accurate.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Bingbing Yang,Lu Bai,Shaojuan Zeng,Shuangjiang Luo,Lei Liu,Jiuli Han,Yi Nie,Xiangping Zhang,Suojiang Zhang
As ecological pollution and resource waste caused by NH 3 emission become increasingly serious, thus the separation and recovery of NH 3 from exhausted gases is of great significance both for environment and economy. Herein, we present a kind of novel ionic liquids (ILs)-based hybrid membranes for efficient NH 3 separation. Protic ILs (PILs) are adopted to form self-assembled gas highways in the hybrid membranes with the nanostructures of a middle-sulfonated pentablock copolymer, exhibiting extremely high NH 3 affinity and gas diffusion. The highest NH 3 permeability and ideal NH 3 /N 2 selectivity is up to 2711 Barrer and 1407 at ambient temperature and 1 bar, much superior to the state-of-the-art membranes reported. The results indicated that the novel IL-based hybrid membranes are promising candidates for high-efficient NH 3 separation and purification.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Zhonghui Zhang,Bolun Yang,Heping Ma
The efficient capture of SO 2 using porous adsorbents is of great significance in flue gas desulfurization (FGD) process as the reversible physical adsorption can avoid solvents/water consumption and minimize waste generation. Metal organic frameworks (MOFs) are interesting and promising candidates to sequestrate SO 2 in flue gas as their high porosities, regular pore sizes and easy functionalization. However, the coordination bond nature of MOFs makes stably and persistently capture acidic SO 2 gas remains a challenge in MOF. Herein, an aliphatic amine decorating strategy was introduced in a MOF (MIL-101(Cr)) with open metal sites for reversible and durable SO 2 capture. The successful synthesis of N,N'-dimethylethylenediamine (mmen) decorated MIL-101(Cr) named mmen-MIL-101(Cr), was confirmed by powder X-ray diffraction (PXRD), Fourier transform-infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy-dispersive spectra (EDS) and nitrogen adsorption–desorption isotherm. Compared with chemisorption of SO 2 on open Cr sites in MIL-101(Cr), the SO 2 adsorption sites are transferred from Cr to N atom in mmen-MIL-101(Cr), leading to reversible SO 2 adsorption and desorption. The dipole–dipole interaction between N atom and S(SO 2 ) atom, combining with hydrogen bonding interaction between O(SO 2 ) and H in mmen can increase the SO 2 absorption capacity of mmen-MIL-101(Cr) under low SO 2 partial pressure. The SO 2 adsorption capacity and cycle stability properties were studied in detail by adsorption isotherm and dynamic breakthrough measurement. An unprecedented high SO 2 adsorb capacity (upto 4.27 mmol·g −1 ) at SO 2 partial pressure (0.5 mbar) is achieved in mmen-MIL-101(Cr), which is a great improvement compared to 2.92 mmol·g −1 SO 2 adsorption capacity for primordial MIL-101(Cr) under the same condition. Moreover, mmen-MIL-101(Cr) manifests reversible SO 2 adsorption–desorption performance while MIL-101(Cr) gradually loses its adsorption capacity during dynamic breakthrough cycles. The high SO 2 sorption capacity in low partial pressure and impressive cycle stability of mmen-MIL-101(Cr) demonstrate aliphatic amine decorating strategy is an efficient way to improve MOF’s SO 2 capture capability, which also can extend to other porous adsorbents for low concentration FGD process.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Haixiang Sun,Shanshan Bao,Haoru Zhao,Yuhao Chen,Yaxuan Wang,Chi Jiang,Peng Li,Q. Jason Niu
Microporous polymer membranes have received extensive attention in the membrane separation field based on the advantage of high gas permeance and low cost. However, there are a few reports of microporous polyacrylate membranes fabricated by interfacial polymerization (IP), and the formation mechanism and influence factor of the microporous structure is rarely illuminated. In this work, thin-film polyacrylate membrane with circular microporous morphology were prepared by IP method with cyclodextrin and acyl chloride as the aqueous and oil phase monomer respectively for effective gas separation. The effects of the aqueous and organic phase monomer structure and concentration, the concentration and type of alkali in the aqueous solution on the membrane morphology and gas separation performance were investigated in detail. As a result, the polyacrylate membrane fabricated by β-cyclodextrin (β-CD) and trimesoyl chloride (TMC) with optimal content of NaOH in the aqueous phase formed the special circular microporous structure by the scanning electronic microscope (SEM) characterization. The resulting membrane showed CO 2 permeance of 200 GPU with CO 2 /N 2 ideal separation selectivity of 10.53. This work provides an effective strategy to fabricate high performance polyacrylate membrane by regulating the monomer structure and the alkali concentration in the aqueous phenol solution with IP method, which would inspire the exploration of other phenolic monomer for the assembly of microporous polymer membranes for gas separation or seawater desalination.
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高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Hui Mei,Shixiang Zhou,Mingyang Lu,Yong Zhao,Laifei Cheng
For real-time environmental monitoring and gas detection under harsh conditions, gas sensors with high reliability, sensitivity, and selectivity are in increasing demand. Therefore, pine-branch-like α-Fe 2 O 3 /TiO 2 with a core–shell hierarchical heterojunction structure was designed and fabricated for ethanol sensing. The heterojunction increased the O adsorption, resulting in the formation of more chemisorbed O species for reaction with the target gas. Moreover, the pine-branch-like morphology formed three-dimensional hollow holes as channels for molecule diffusion and adsorption. Compared with gas-proof structures, the hollow regions can realize gas diffusion in the inner and outer surfaces of materials simultaneously. Further, in contrast to aggregated structures, the fibers were separated from each other, and charge conduction between the fibers needed to pass through the surface sensing layer at the fiber boundary; thus, the overall resistance change of the sensors was significantly affected by the response of the heterojunction to the target gas. Consequently, the α-Fe 2 O 3 /TiO 2 sensor exhibited a high response value of 40.4 toward 500 ppm ethanol gas and had excellent selectivity to ethanol. The proposed strategy may facilitate the design and construction of effective heterojunctions and nanostructures for gas sensing.
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高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2020
·Vol. 95
·期 9
·2403-2410
·
IF 2.75
Li Sun,Chuanliang Li,Hua Zhang,Binlin Dou,Wenxian Su,Lixin Zhang
BACKGROUND At present, much attention has been focused on the development of methane (CH 4 ) sensors due to a series of explosions and fires caused by CH 4 gas leakage. RESULTS Here, a CH 4 thermoelectric gas sensor (TGS) was fabricated by fixing 3D porous palladium/cobalt oxide (Pd/Co 3 O 4 ) catalyst on a commercial thermoelectric module. 3D porous Pd/Co 3 O 4 catalysts were prepared by a co-precipitation and gel-casting method. The pore structure in catalysts could be tailored only by adjusting the gel viscosity during the formation process. The protocol to tune the pore structure is facile and effective for the improvement of the activity of catalysts. By means of various techniques, the catalysts were characterized and then the possible catalytic mechanism was revealed. The CH 4 TGS based on the optimal Pd/Co 3 O 4 catalyst began to respond at 200 °C, following an obvious output voltage (Δ V ) of 5 mV. Enhancing the operating temperature to 240 °C, the value of Δ V reached to 31 mV and exhibited a linear relationship with CH 4 gas concentration. Meanwhile, the CH 4 TGS showed high sensitivity, repeatability and stability. CONCLUSION The easy and effective preparation method presented to prepare 3D porous Pd/Co 3 O 4 catalyst can provide an unique perspective on the development of 3D porous materials with excellent properties. It can be anticipated that the CH 4 TGS based on the 3D porous Pd/Co 3 O 4 catalyst will be a potential candidate for the detection of CH 4 gas in industrial settings. © 2020 Society of Chemical Industry
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Li Lv,Pengfei Cheng,Yinglin Wang,Luping Xu,Bao Zhang,Chao Lv,Jian Ma,Yue Zhang
In this paper, the preparation process and gas sensing performance of Sb-doped three-dimensional spinel ferrite (3D ZnFe 2 O 4 ) with well-assembled macroporous spherical structure have been investigated. Sb-doped 3D ZnFe 2 O 4 macroporous spheres (MPs) were prepared through a one-step ultrasonic spray pyrolysis (USP) method by sacrificing self-assembly sulfonated polystyrene spheres (S-PSs). The interconnected macropores (an average pore size about 200 nm) can be observed in the as-prepared materials by SEM and TEM characterization, which provided the dual functions of accelerating the diffusion of gas molecules and providing more reactive sites. The XPS analysis showed that the element Sb existed as Sb 5+ in doped samples. Compared with the pure 3D ZnFe 2 O 4 MPs (response = 18), 0.5 % Sb-doped sample presented the response of 35.5–100 ppm n-butanol at 250 °C, and also revealed excellent selectivity and long-term stability to n-butanol. The greatly enhanced sensing performance of Sb-doped simples can be attributed to the construction of 3D spheres with interconnected macroporous structures and the modification of Sb doping. The formation of p-n junctions at interface through Sb doping also improved the sensing performance for n-butanol. In addition, the relative sensing mechanism of Sb-doped 3D ZnFe 2 O 4 MPs for n-butanol sensing has been discussed in detail.
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高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2020
·
IF 3.085
Qinghao Zeng,Yanfa Cui,Lianfeng Zhu,Youwei Yao
Partially reduced SnO 2 was prepared by using NaBH 4 as reducer under room temperature. After NaBH 4 treatment, the oxygen vacancy density of SnO 2 was increased greatly. X-ray photoelectron spectroscopy, photoluminescence and electron paramagnetic resonance indicates that the obtained materials are characteristic of a high concentration of oxygen vacancies. Owing to increased oxygen vacancy concentration, these materials showed significantly high gas-sensing response to ethanol. Compared with the ethanol-sensing response value of 36.9 for pristine SnO 2 towards 300 ppm ethanol, the response value for the partially reduced SnO 2 is 120.3. This ethanol-sensing response enhancement may be attributed to the fact that the increased surface oxygen vacancy facilitates oxygen adsorption, and promotes chemical reaction on the surface.
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高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2020
·
IF 3.871
Ya-Ni Ji,Wen-Jie Geng,Chun-Yang Ma,Jing Tan,Wen-Sheng Deng,Bin Liu,Yue-Feng Su
A simple and effective method was conducted for preparing microdispersed droplets with decreased size and increased uniformity, in which phase inversion in high-phase-ratio liquid/liquid system was combined with addition of microbubbles. Five typical flow patterns were observed, including W/O, O/W/O, transition regime, O/W and G/W/O regimes. Flow regime transition was observed, according to which physical properties of systems and operating conditions for preparing single-oil-droplet-in-water emulsion were determined in different liquid/liquid and gas/liquid/liquid modes. Effects of liquid viscosities as well as interfacial tension on droplet size ( D O ) and its standard deviation (SD) were studied systematically and the most effective gas/liquid/liquid mode was recommended. Mathematical models were established for correlating D O in five different modes, which show relatively good agreement with experimental results. D O decreases by 42% via introducing phase inversion and further reduces to 25% by addition of microbubbles, both under the same operating conditions.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Peng Xiao,Jia Li,Hong-Liang Zhang,Guang-Jin Chen,Chang-Yu Sun
Fluidizing highly converted hydrate particles is a potential way for continuously producing gas hydrate in gas storage application. However, the fundamental problem is to prevent hydrate agglomeration while keeping a high formation rate. In this study, water–oil systems were used to investigate the feasibility of fluidizing the methane hydrate with fast formation rate. The formation kinetics and the slurry morphology of methane hydrate were systematically studied in the presence of single or commingled additives. Among the single additives, Span 20 provided the highest volumetric gas uptake of 177.7 V/V w (standard volume of gas per volume of water) at water cut of 20 vol%; with an increase in water cut, the volumetric gas uptake decreased and more hydrate agglomerated. All the single additives could not prevent hydrate agglomeration perfectly, even for Span 20, the best-performing single additive, prevented hydrate agglomeration well only at low water cut of 5 vol% and 10 vol%. The commingled additives comprised 1.0 wt% (to water) Span 20 and 2.0 ~ 3.0 wt% co-additives. When these co-additives were used in coordination with Span 20, most of them inhibited hydrate formation. By decreasing the concentration of TBAB from 5.5 wt% to 0.025 wt%, the inhibiting effect of TBAB faded away, while the anti-agglomerating effect remained. Similar phenomena were also found with some other co-additives. The results showed that low water cut, high Span 20 concentration, particularly the commingled additives could be solutions for fluidizing highly converted hydrate particles.
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高影响因子
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