Chemistry-An Asian Journal
·
2014
·Vol. 9
·期 12
·3440-3450
·
IF 3.935
Pengyao Xing,Xiaoxiao Chu,Mingfang Ma,Shangyang Li,Aiyou Hao
Self-assembly of N -fluorenyl-9-methoxycarbonyl glutamic acid (Fmoc-Glu) in water generates metastable single-wall nanotubes. These nanotubes entangle and bundle together to form unstable gels that shrink with time and finally result in lamellar crystalline precipitates. Melamine (Mm) was employed as a supramolecular modifier and stabilizer to improve the stability of the nanotubes. Mm interacts with the carboxyl-rich surfaces of the nanotubes via H-bonds and static electronic forces to diminish the high affinity of individual nanotubes and facilitate Fmoc-Glu supergelation (critical gelation concentration <0.1 wt %). Although the basic process of nanotube formation is not disturbed, Mm inverts the supramolecular helicity of nanotubes from P to M .
✓ 已验证
DOI
高影响因子
IEEE TRANSACTIONS ON PLASMA SCIENCE
·
2021
·Vol. 49
·期 12
·3759-3763
·
IF 1.222
Jie-Qing Fan,Yao Li,Fang Zhang,Jian-Hong Hao,Zhi-Wei Dong,Qiang Zhao
To study the electromagnetic radiation effect of a thermal control layer (TCL) on the surface of general spacecraft in a space environment, a model of a metal aluminum film material irradiated with microwaves was established, particle-in-cell (PIC)-Monte Carlo collisions (MCCs) simulation was used, and the processes of field emission, multipacting, outgassing, and impact ionization on the surface of thermal control materials were simulated. By comparing the primary-, secondary-, and impact ionization electrons produced under different gas densities, the influence of the process on metal aluminum film was analyzed. The simulation results show that the field emission, multipacting, and collisional ionization on the material surface all strengthened when the outgassing density exceeded the threshold value, and outgassing collision ionization was dominant among them. Avalanche ionization occurred on the material surface to generate plasma, which absorbs electromagnetic wave energy, and the total increase in the energy of ions and electrons may cause damage to the aluminum film, which is very important in its practical application.
✓ 已验证
DOI
高影响因子
Anti-Cancer Agents in Medicinal Chemistry
·
2015
·Vol. 15
·期 3
·285-290
·
IF 2.469
Dongbo Xu,Min Ma,Yongfeng Liu,Ting Zhou,Kexin Wang,Zixin Deng,Kui Hong
PreQ0 base (7-cyano-7-deazaguanine, compound 1) is the biosynthetic precursor of queuosine-tRNA and important synthetic intermediate for bioactive compounds. It was obtained for the first time as a new natural product from a mangrove actinomycete Streptomyces qinglanensis 172205, during the course of searching for anti-cancer compounds from marine microbes. PreQ0 base showed anti-HeLa (IC50 = 62.0 μ g/ml) and anti-HepG2 (IC50 = 80.6 μ g/ml) activities, higher cytotoxicity than the positive control, fluorouracil. Furthermore, it exhibited weak α -glucosidase inhibitory activity, but no obvious antimicrobial and Aβ 1-42 fibrillation inhibitory activities. In silico analysis of the genome of the strain 172205 revealed a putative biosynthetic gene cluster directing the biosynthesis of PreQ0 base. The gene cluster only contained three Open Reading Frames (ORFs), queC, queD and queE. The absence of the key gene queF encoding 7-cyano-7-deazaguanine reductase catalyzing PreQ0 base to PreQ1 base suggested that the strain only has the capacity of accumulation of PreQ0 base as a metabolite, consistent with our observation in chemical identification.
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·Vol. 13
·期 6
·5995-6004
·
IF 1.5
Yu Zhang,Zhi Xia,Qianzhu Li,Guofeng Gui,Gaoyu Zhao,Shuchang Luo,Minjian Yang,Longli Lin
Hexagonal boron nitride nanosheet (h-BNNS), known as a white graphene is a promising candidate material for the fabrication of hybrid materials due to its atomically-thick sheet structure, high thermal conductivity, large surface area, unique chemical stability and thermal oxidation-resistance properties. In this paper, h-BNNS was synthesized by a hydrothermal method and then it dropped on the glassy carbon electrode (GCE) to construct h-BNNS/GCE, which has good stability because of the good film-forming ability of h-BNNS. Finally, a modified electrode (Cu-h-BNNS/GCE) was prepared by an electrodeposition technique. Due to the characteristics of h-BNNS and Cu and their synergistic effects, the modified electrode shows good electrochemical response to nitrite. The morphology and structure of the nanocomposite are studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The electrochemical behaviors of nitrite on the as-prepared electrode were evaluated by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). Under optimal conditions, the oxidation peak current of nitrite was linearly proportional to its concentration in the range from 0.09 to 9853.45 μM, with a detection limit of 0.03 μM.
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Lihang Wu,Qinglong Xie,Zhenyu Wu,Ting Zheng,Xianghong Lu,Meizhen Lu,Yong Nie,Jianbing Ji
A feasible method for treatment of wastewater generated during epoxy methyl ester production was provided in this study, which consisted of four parts, i.e., neutralization, heat pump distillation, evaporation crystallization, and adsorption. For this treatment process, adsorption was a key step. The major pollutants of epoxy methyl ester wastewater after neutralization and distillation were determined as methanol, ethyl alcohol and epoxy propane. Activated carbon was used as an adsorbent for the wastewater treatment and the adsorption behavior was mainly studied. The adsorption experiments of methanol as the model compound to actual wastewater using virgin activated carbons (VAC) and HNO 3 modified activated carbons (MAC) were carried out. FTIR and Boehm titration results indicated the increased oxidation groups were obtained through modification. Several isotherm and kinetic models were adopted to fit the experimental data by non-linear regression method. Results showed that Langmuir isotherm and pseudo-second order kinetic models can well describe the adsorption behavior. Various thermodynamic parameters such as standard free energy (ΔG 0 ), enthalpy (ΔH 0 ), and entropy (ΔS 0 ) showed that the adsorption of methanol onto carbon was favored at lower temperature. In addition, breakthrough curves were determined using the column adsorption, which were fitted well by the Thomas model. Furthermore, the COD of initial actual wastewater (about 35000 mg/L) was significantly reduced to 293 mg/L after treatment. Finally, regeneration experiments demonstrated the potential of this method.
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·Vol. 13
·期 3
·1332-1337
·
IF 5.7
Tingting Cao,Feifei Guo,Fuai Hu,Xutang Tao,Zeliang Gao
Semiconductor-based X-ray detectors have become critical in medical diagnosis, industrial inspections, and scientific research. The recently reported metal oxide single-crystal materials have demonstrated low detection limits and outstanding stability. Herein, Lu2TeO6 is rationally designed and successfully grown as a novel X-ray detection material using the top-seeded solution growth (TSSG) technique. Due to the high valence and heavy ions Lu3+ and Te6+, Lu2TeO6 exhibits a high X-ray attenuation coefficient and negligible current drift. The (100) and (001) wafers of the Lu2TeO6 single crystal exhibited ultrahigh resistivities of 9 × 1014 Ω cm and 1.09 × 1015 Ω cm and high μτ values of 5.69 × 10−4 cm2 V−1 and 5.62 × 10−4 cm2 V−1, respectively. The detectors demonstrated low, stable dark current drifts of 3.42 × 10−8 nA cm−1 s−1 V−1 and 2.42 × 10−8 nA cm−1 s−1 V−1 for X-ray detection, achieving high sensitivities of 291.93 μC Gy−1 cm−2 and 248.65 μC Gy−1 cm−2 and ultralow detection limits of 23.5 nGy s−1 and 15.8 nGy s−1. These results reveal the potential application of Lu2TeO6 single crystals in X-ray detection and propose a promising perspective to design X-ray detection materials with high performance.
✓ 已验证
DOI
高影响因子
Journal of Developmental Entrepreneurship
·
2021
·
IF 0
GARRY D BRUTON,NURADDEEN NUHU,JING JING QIAN
Entrepreneurship is viewed as a major tool in the effort to address poverty in emerging economies. Yet financing for such entrepreneurial ventures remains a major challenge. To date, most research on financing of entrepreneurial ventures among those in poverty in emerging economies has focused on formal financial tools such as microfinancing. However, a far larger financing tool employed in practice is informal financing. Such financing takes the shape of loans by family/friends/neighbors, private money lenders, or rotating savings groups. Very little is known about how these finance tools affect entrepreneurship. This article reviews the existing literature on informal finance in emerging economies and then develops a rich research agenda for scholars on informal finance in emerging economies and its role in entrepreneurship.
✓ 已验证
DOI
Sustainable Energy & Fuels
·
2021
·Vol. 5
·期 12
·3102-3114
·
IF 6.367
SocMan Ho-Kimura,Wenjun Luo
To understand the consequence of an Fe2O3/BiVO4 heterojunction simply, we fabricated an FTO/Fe2O3/BiVO4 composite photoanode for photoelectrochemical (PEC) water oxidation. We discovered that forming a heterojunction between the Fe2O3 underlayer and BiVO4 upper layer dramatically increased the photocurrent in the low bias region. This photocurrent density increased six-fold from 0.15 mA cm−2 at 0.6 V vs. the reversible hydrogen electrode (RHE) for BiVO4 to 0.95 mA cm−2 at 0.6 V vs. RHE for BiVO4 with the Fe2O3 underlayer. The faradaic efficiency of PEC water splitting was close to 100%, and the molar ratio of the generated hydrogen to oxygen was 2 : 1. However, the photocurrent did not improve in the high bias region; at higher than 1.23 V vs. RHE, the photocurrent density of the FTO/Fe2O3/BiVO4 electrode was lower than that of the bare BiVO4 electrode. The effects of the Fe2O3 underlayer greatly improved the charge separation efficiency, but such improvements were noted only in the low bias region. In addition, the PEC performance was observed to depend on the thickness of the Fe2O3 underlayer. The optimised FTO/Fe2O3/BiVO4 electrode was achieved when the Fe2O3 underlayer was approximately 350 nm thick and when the BiVO4 upper layer had approximately the same thickness as the underlayer.
✓ 已验证
DOI
高影响因子
Small
·
2016
·Vol. 12
·期 36
·4973-4979
·
IF 8.315
Liu X,Men C,Zhang X,Li Q.
Sulfonated graphenal polymers can be assembled up by poly(vinyl alcohol) adhesion. The porous assembly structure results in a remarkably improved ionic conductivity and thus enhances electrochemical performances such as specific capacitance, capacitance retention, and cycling stability.
✓ 已验证
DOI
PubMed
高影响因子
Advanced Materials Interfaces
·
2017
·Vol. 4
·期 22
·1700777
·
IF 4.279
Wentao Gan,Likun Gao,Shaoliang Xiao,Runan Gao,Wenbo Zhang,Jian Li,Xianxu Zhan
An effective induction heating material composed of wood and magnetic Fe 3 O 4 particles is prepared via a simple hydrothermal method. Fe 3 O 4 particles deposit on the porous wood substrate provides excellent magnetic properties and high magnetothermal conversion resulting in rapid increase in the temperature at the wood substrate. Benefiting from the effective magnetocaloric effect of magnetic particles, the temperature of magnetic wood exhibits a noticeable rise (from 25.9 to 70.1 °C in 10 min) at low-frequency magnetic field. For simulating the real environment, the indoor temperature rise of magnetic wooden model also reveals the excellent heating performance of magnetic wood. Besides, the magnetic wood also serves as a thermal insulator to slow down the transport of thermal energy from the high temperature area to its surroundings due to its low thermal conductivity, which benefit the rational use of thermal energy in daily life. In view of highly scalable, simple operation, good durability, excellent magnetic properties, effective magnetocaloric effect, and thermal insulation, the novel magnetic wood composite demonstrated here is an attractive induction heating material for application in building, decoration, and massage furniture.
✓ 已验证
DOI
高影响因子
ChemElectroChem
·
2019
·Vol. 6
·期 9
·2531-2535
·
IF 3.975
Mingyang Liu,Mengyang Xia,Ruijie Qi,Qun Ma,Man Zhao,Zailei Zhang,Xianmao Lu
Self-discharge severely constrains the application of supercapacitors for long-term energy storage because it causes decay of cell voltage and loss of energy. So far, three pathways have been proposed for the self-discharge of supercapacitors: i) ohmic leakage, ii) diffusion-controlled self-discharge, iii) faradaic reactions. However, solutions for mitigating the self-discharge of supercapacitors are limited. Here, we choose lyotropic liquid crystal (LLC) as an electrolyte additive to suppress the self-discharge of supercapacitors through the electrorheological effect of the LLC. The LLC formed by the assembly of a triblock copolymer Pluronic L64 in ion liquid [Bmim]BF 4 exhibits dielectric anisotropy and can reorient in an electric field, causing increased viscosity and slower ion diffusion of the electrolyte. It is found that, by adding 5 % (vol%) LLC into TEMABF 4 /acetonitrile electrolyte, the self-discharge rate at room temperature can be decreased by 32 % compared to supercapacitors without LLC. Furthermore, the LLC could reduce the self-discharge rate of supercapacitors even at 50 °C due to its stability in a relatively wide temperature range. Graphical Lyotropic liquid crystals (LLCs) formed through the assembly of a triblock copolymer Pluronic L64 in ion liquid [Bmim]BF 4 are employed as an electrolyte additive for supercapacitors. The addition of LLCs leads to suppressed self-discharge rate in an extended temperature range from 25 to 50 °C.
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Yongquan Qing,Chuanbo Hu,Chuanning Yang,Kai An,Fawei Tang,Junyang Tan,Changsheng Liu
Superhydrophobic surfaces with self-cleaning properties have been developed based on roughness on the micro- and nanometer scales and low-energy surfaces. However, such surfaces are fragile and stop functioning when exposed to oil. Addressing these challenges, here we show an ultrarobust self-cleaning surface fabricated by a process of metal electrodeposition of a rough structure that is subsequently coated with fluorinated metal-oxide nanoparticles. Scanning electron microscopy, Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy, and X-ray diffraction were employed to characterize the surfaces. The micro- and nanoscale roughness jointly with the low surface energy imparted by the fluorinated nanoparticles yielded surfaces with water contact angle of 164.1° and a sliding angle of 3.2°. Most interestingly, the surface exhibits fascinating mechanical stability after finger-wipe, knife-scratch, sand abrasion, and sandpaper abrasion tests. It is found that the surface with superamphiphobic properties has excellent repellency toward common corrosive liquids and low-surface-energy substances. Amazingly, the surface exhibited excellent self-cleaning ability and remained intact even after its top layer was exposed to 50 abrasion cycles with sandpaper and oil contamination. It is believed that this simple, unique, and practical method can provide new approaches for effectively solving the stability issue of superhydrophobic surfaces and could extend to a variety of metallic materials.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）