ACS Omega
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2020
·
IF 2.87
Qiao Chen,Ning-bo Feng,Xian-he Huang,Yao Yao,Ying-rong Jin,Wei Pan,Dong Liu
The performance of a bismuth oxychloride (BiOCl)-based quartz crystal microbalance (QCM) humidity sensor was studied using an oscillating circuit method. The BiOCl powder was prepared by a hydrolysis method. Scanning electron microscopy, X-ray diffraction, and Fourier transform infrared spectroscopy were used to characterize the BiOCl sample. Its humidity-sensing property was analyzed by combining it with a QCM at room temperature (25 °C). Experimental results indicated that the BiOCl-based QCM sensor showed good humidity characteristics from 11.3 to 97.3%, such as good logarithmic frequency response to humidity levels (R2 = 0.994), fast response time (5.2 s)/recovery time (4.5 s), good reversibility, stability, repeatability, and low humidity hysteresis. In addition, the response to human nose breaths showed excellent practicability. Finally, the humidity sensing mechanism of the BiOCl-based QCM humidity sensor was discussed in detail. This work demonstrates that BiOCl is a promising candidate material for humidity detection.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2020
·
IF 2.369
Jingping Sun,Long Wang,Shuaiwei Ding,Xiaobo Sun,Li Xu
The solubility of bisphenol A in 14 different pure solvents (N,N-dimethylformamide, formamide, acetone, 1,4-dioxane, cyclohexanone, ethyl acetate, methyl acetate, acetonitrile, ethanol, methanol, 1-propanol, 1-butanol, 2-propanol, and 2-butanol) was measured at T = (273.15–313.15) K under atmospheric pressure using a laser dynamic method. The experimental data of bisphenol A were correlated by modified Apelblat equation, λh equation, nonrandom two-liquid model and Wilson model, and the fitting results showed that the modified Apelblat equation gave the best correlation with the experimental results. The thermodynamic functions of bisphenol A in 14 pure solvents, such as dissolution enthalpy (ΔmixH), Gibbs energy (ΔmixG), and dissolution entropy (ΔmixS), were obtained from the Wilson model. The results of the ΔmixG < 0 and ΔmixH < 0 indicated that the dissolution process of bisphenol A in selected solvents was exothermic and spontaneous. The values of γ1∞ and γ1 were not close, indicating that bisphenol A in selected solvent solution systems was nonideal.
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ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
M.W. Guo,C.B. Sun,W.Q. Yang,L. Chen,H. Lei,Q.B. Zhang
Deep eutectic solvents with the advantages of being less expensive, non-toxic, renewable, and biodegradable are emerging as versatile solvent systems for the electrochemical synthesis of advanced functional materials. Herein, we study the electrochemical deposition of Mn nanoflake arrays grown on Cu foam and the morphology evolution of Mn crystals in the early stages of nucleation and growth in a choline chloride/ethylene glycol-based deep eutectic solvent (Ethaline-based DES). Thiourea (TU) is an efficient additive that is found to promote the electrochemical reduction of Mn(II) species in Ethaline-based DES and induce the formation of Mn nanoflake architectures with a nanoporous configuration. Investigation of the nucleation and growth processes with chronoamperometric transients reveals that the presence of TU can accelerate the generation of homogeneous Mn nuclei and dramatically enhanced the nucleation rate by modifying the corresponding nucleation and growth model from 3D progressive to 3D instantaneous. TU is found to play an important role in the crystallization kinetics of Mn crystals and manipulate the shapes, sizes, and growth morphologies of the formed Mn films. Our work highlights the importance of additives for controlling the microtopography of nanostructured Mn in Ethaline-based DES for potential electrochemical applications.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2020
·
IF 2.369
Rongrong Li,Wei Wang,Xianlang Chen,Hong Chen,Huanhuan Bao,Yuwei Zhu,Jia Zhao,Deman Han
This study reports the equilibrium solubility for monobenzone in methanol, ethanol, n-propanol, isopropanol, n-butanol, acetonitrile, ethyl acetate, acetone, 1,4-dioxane, cyclohexane, N,N-dimethylformamide (DMF), N-methyl-2-pyrrolidinone (NMP), n-hexane, n-octanol, and water that was determined by means of the isothermal method between 283.15 and 313.15 K under p = 101.1 kPa. The maximum value of monobenzone solubility was 0.6316 in mole fraction at 313.15 K dissolved in ethyl acetate, but the least data was achieved in water. The solubility of monobenzone increased with the rising temperature and the order followed in the 15 pure solvents was ethyl acetate (0.6316, 313.15 K) > 1,4-dioxane (0.4350, 313.15 K) > methanol (0.1356, 313.15 K) > acetonitrile (0.1247, 313.15 K) > (ethanol, isopropanol) > n-propanol (0.09942, 313.15 K) > n-butanol (0.08346, 313.15 K) > n-octanol (0.03546, 313.15 K) > cyclohexane (8.020×10–3, 313.15 K) > n-hexane (3.133 × 10–3, 313.15 K) > NMP (2.372 × 10–4, 313.15 K) > DMF (1.145 × 10–4, 313.15 K) > acetone (4.032 × 10–5, 313.15 K) > water (3.019 × 10–5, 313.15 K). There was no existence of processes such as solvation or polymorphic transformation during the entire experiment. Several models covering the modified Apelblat, λh, Wilson, and non-random two-liquid models were applied to correlate and calculate monobenzone solubility data in fifteen monosolvents. Results showed that the modified Apelblat equation provided the best results with the experimental ones. The largest relative average deviation and root-mean-square deviation were no more than 4.74 × 10–2 and 1.81 × 10–3, respectively.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Xiaolei Wu,Hanqing Zhao,Junmin Xu,Ye Wang,Shuge Dai,Tingting Xu,Shengman Liu,Sen Zhang,Xinchang Wang,Xinjian Li
Marcasite FeS 2 hollow microspheres were selectively synthesized by a simple hydrothermal method . Time-dependent evolution reveal that marcasite FeS 2 hollow microspheres is formed attributed to the phase transformation from greigite Fe 3 S 4 into marcasite FeS 2 with Ostwald ripening mechanism. The hollow marcasite FeS 2 exhibits excellent electrochemical performance as the anode of sodium ion batteries (SIBs). Significantly, the FeS 2 (M) hollow microspheres deliver a high specific discharge capacity of 363 mA h g −1 at 100 mA g −1 after 300 cycles. They also still deliver high-rate and long-life performance with a specific discharge capacity of 280 mA h g −1 at a high current density of 1000 mA g −1 after 1000 cycles. Moreover, the high rate capability and long cycling stability of the FeS 2 (M) hollow microsphere electrodes are investigated by the in-depth kinetics analysis. Our results demonstrate the marcasite FeS 2 hollow microspheres would be a promising anode material for SIBs.
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2020
·
IF 1.943
Shi-wen Wang,Ming Mao,Yang Cao,He-wei Luo,Heng Wang,Dong-jie Guo
Using NiCl 2 ·6H 2 O, CoCl 2 ·6H 2 O, Na 2 HPO 4 , manganese dioxide (MnO 2 ) and Multi-walled carbon nanotubes (MWCNTs) as the main raw materials, the cuboid-like cobalt nickel phosphate/MnO 2 /MWCNTs (CNPMM) composites were successfully prepared by a simple hydrothermal method. The morphology, composition and structure of the composites were studied by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM), X-ray diffraction (XRD), Raman spectrum, specific surface area analyzer and particle size analysis. SEM images showed that the composite material presented a cuboid-like morphology. The width, length and height of cuboids are 0.3–0.8 µm, 2–3 µm and 8–10 µm, respectively. The special structure and morphology of the sample provide more active sites, making it exhibit superior pseudocapacitance. The electrochemical performance of the three-electrode system supercapacitor was systematically studied by cyclic voltammetry, constant current charge-discharge and electrochemical impedance spectroscopy. When the mass ratio of MnO 2 to MWCNTs is 1:1 with the total doping amount of 3.9 wt%, the as-prepared CNPMM 1:1 composite shows the best capacitance performance. With 3 mol·L −1 KOH as the electrolyte, it exhibits a specific capacitance as high as 2334 F g −1 at the current density of 1 A g −1 . Even at the high current density of 10 A g −1 , the specific capacitance can still be maintained at 1672 F g −1 , and the corresponding specific capacitance retention of 71.6%, indicating that the composite electrode material has good rate performance. The results show that the cuboid-like CNPMM 1:1 composite is a promising electrode material for supercapacitors.
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NANOTECHNOLOGY
·
2020
·Vol. 31
·期 16
·165503
·
IF 3.551
Hang Song,Jie Liu,Haiyang Lu,Chao Chen,Long Ba
A gas sensor made from graphene vertical field effect transistor (VGr-FET) has been fabricated using graphene as the source electrode, C60 thin film as the semiconductor layer and aluminum thin film as the drain electrode. The on/off ratio of transistor gated by bottom electrode with ionic liquid gel as dielectric layer is derived to be 103 from measured source–drain current Ids. The apparent energy barrier height between the graphene and polycrystalline fullerene was calculated from the model of heterojunction diode I–V response curves. The barrier height φBH was altered by the gating potential vertically applied on graphene sheet, resulting the large on/off ratio of the transistor. The effect of surface adsorption of water vapor, oxygen, ammonia and isoprene gas phase molecules on the Ids was measured. The lower limit of detection (LOD) for ammonia (86 ppb) than that of isoprene (420 ppb) is attributed to the donor nature of ammonia contact with p-type graphene, and the adsorbed donor leads to a corresponding positive gating effect to the VGr-FET. This facile, low cost and quick responsive device shows promise for early diagnose of severe human respiratory diseases.
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Journal of Materials Chemistry B
·
2020
·Vol. 8
·期 27
·5883-5891
·
IF 5.344
Shuhan Wang,Wensong Xi,Zhuo Wang,Huijun Zhao,Lei Zhao,Jianhui Fang,Haifang Wang,Lining Sun
It remains a great challenge to integrate effective photothermal therapeutic materials with upconversion nanoparticles (UCNPs) into one structure with small size. Herein, a new and simple method was developed to combine the luminescent UCNPs with vanadium disulfide (VS2) heterogeneously growing on the UCNPs. VS2 was grown directly on the surface of UCNPs to obtain oil-soluble nanocomposites, UCNPs@VS2. Then polyethylene glycol (mPEG) was functionalized on the surface of the nanocomposites to improve the water solubility, resulting in the integrated nanostructure UCNPs@VS2-mPEG (with an approximate size of 25 nm) for bioimaging and photothermal therapy in vitro. Importantly, cytotoxicity test results show that the final nanostructure has good biocompatibility. Furthermore, due to the excellent photothermal effects of VS2 and the unique imaging function of UCNPs, the nanostructure shows effective photothermal therapy for HeLa cells and was successfully applied in magnetic resonance imaging and upconversion luminescence imaging in vitro. Therefore, this study demonstrates a simple yet powerful method of growing VS2 on the surface of UCNPs, which provides an effective method to establish one integrated nanostructure with a nanoscale advantage for dual-model bioimaging and treatment.
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JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 26
·12091-12102
·
IF 3.553
Sheng Peng,Tao Shi,Gao Xiaorui,Tan Yongjian,Wu Dajun,Qian Bin,Chu Paul K.
Cobalt carbonate hydroxide possesses interesting capacitive properties due to the unique crystal structure. Herein, the hierarchical Co 3 O 4 @Co 2 (CO 3 )(OH) 2 dendritic structure was fabricated on carbon cloth with Co 3 O 4 nanoneedles as the inner core to enhance the conductivity. The loading efficiency of Co 2 (CO 3 )(OH) 2 nanowhiskers had improved obviously, and the nanowires provided more electrochemical sites to facilitate the superior electrochemical energy storage capacity of supercapacitor. The dendritic electrode with the core–shell structure had a high area-specific capacitance (1541 mF cm −2 at 1 mA cm −2 ), good rate capacitance (only 18.1% specific capacitance lost when the current density increased to 5 mA cm −2 ), as well as better electrochemical cycle stability (a capacitance retention of 72.1% after 5000 cycles at a high current density of 5 mA cm −2 ). The dendritic Co 3 O 4 @Co 2 (CO 3 )(OH) 2 and activated carbon as cathode and anode, respectively, were used to assemble an asymmetric supercapacitor, possessing the better area-specific capacitance of 87 mF cm −2 as well as well-deserved longevity retaining approximately 97.3% of initial capacitance even after 10,000 cycles at 1 mA cm −2 . The excellent properties stemmed from electro-active sites galore, strong adhesion between the core and shell, superior conductivity, as well as excellent ion transfer. The novel materials and feasible strategy are promising for next-generation hybrid supercapacitor with high performance.
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CRYSTENGCOMM
·
2020
·Vol. 22
·期 27
·4591-4601
·
IF 3.117
XiuBo Xie,Cui Ni,Hongying Yu,Wei Du,Xueqin Sun,Dongbai Sun
Core@shell-structured Co@C nanoparticles (NPs) were designed in this work. The shell thickness of carbon at 2.0, 3.2, 3.6, 4.0, and 4.7 nm was tuned by changing the weight ratio (Co : glucose = 2 : 1, 1 : 1, 1 : 2, 1 : 4, 1 : 10) of glucose in the reaction process. The influences of the carbon-shell thickness on the electromagnetic parameters and catalytic activity of the nanocrystalline Co were studied. Among the five samples, the Co@C-21 NPs (carbon-shell thickness of 2.0 nm) mixed with paraffin wax (PW) showed the best reflection loss (RL) of −42.5 dB at 16.1 GHz, while the Co@C-11-PW composite (carbon shell thickness of 3.2 nm) exhibited the best absorption bandwidth for RL < −10 dB of 9.6 GHz (8.4–18.0 GHz) with a matching thickness of 2.6 mm. The natural/exchange resonances, interfacial polarization, and uniformly dispersed Co NPs led to a high microwave absorption performance of the Co@C absorber with good impedance matching. Moreover, as a catalyst for the model removal reaction of 4-nitrophenol (4-NP), the Co@C-110 NPs with a shell thickness of 4.7 nm showed the best kinetic rate constant of 0.31 min−1, 4.3 times higher than that of the Co@C-21 NPs. The Co@C NPs are a potential microwave absorber and effective catalyst for the reduction of 4-NP.
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FOOD CHEMISTRY
·
2020
·
IF 6.306
Xiujuan Wang,Meng Song,Suting Liu,Sizhu Wu,Aung Myat Thu
Based on the experimental data of gas chromatography-mass spectrometry, an improved artificial neural network was first established to predict the migration of 2-ethylhexyl phthalate (DEHP) plasticizer from poly(vinylidene chloride) (PVDC) into food simulants (ie., heptane, ethanol and water). The sensitivity analysis indicated that temperature acted as a crucial factor influencing the migration values of DEHP. Then, a combined experimental and molecular dynamic (MD) simulation was performed to understand the migration kinetics and the mechanism of DEHP. Hansen solubility parameters of three component ( δ d , δ p , δ h ) were simplified into two-component solubility parameters ( δ vdW , δ e ), and the tuple was successfully applied to describe the interactions between PVDC and food simulants. The MD results showed that high interaction energy and fractional free volume in PVDC/DEHP/food simulant systems accelerated the migration of DEHP. These fundamental studies would provide significant insights into the migration of environmental contaminants.
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MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 6
·1-8
·
IF 6.232
Liang Pei,Cao Yu,Dong Qianmin,Wang Dan,Zhang De,Jin Shangzhong,Yu Zhi,Ye Jiaming,Zou Mingqiang
Simple and traditional hydrothermal fabrication of a novel balsam pear-shaped CuO with high SERS enhancement is presented. XRD (X-ray diffraction), SEM (scanning electronic microscopy), TEM (transmission electron microscope), HRTEM (high-resolution transmission electron microscope), UV-Vis, and Raman are adopted to ensure that this balsam pear-shaped CuO with dense nanoparticle protuberance is successfully prepared. The LOD of this CuO SERS substrate is 4.79 μg L −1 with R6G as molecular probe. By using DFT (density functional theory) calculation and FDTD (finite difference time domainmethod) simulation, both EM (electromagnetic enhancement) and CM (chemical enhancement) mechanisms are investigated, and the results show that these two-enhancement mechanisms can coexist in this balsam pear-shaped CuO. Finally, the prepared substrate has been applied for the determination of trace levels of paraquat in solution , and results show that its LOD for paraquat is 275 μg L −1 (optimum Raman band: 1646 cm −1 Raman shift), which is better than the government standard in China. A dexterous and facile way for fabrication of CuO SERS-active substrates with low cost and high performance, quite promising in detection of chemically hazardous substances and pesticide residue is provided.
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危险品化学品经营许可证（带存储）