CHINESE JOURNAL OF CATALYSIS
·
2014
·
IF 1.552
Qiuhe Ren,Yizheng Huang,Hong Ma,Jin Gao,Jie Xu
The promotion effect of alkali metal halides toward the AlCl 3 -catalyzed conversion of glucose to 5-hydroxymethylfurfural (HMF) was investigated. The results show that NaF inhibited the reaction. However, NaI and NaBr promoted the reaction significantly, and the promotion effect of NaI was more obvious than that of NaBr. In N , N -dimethylacetamide (DMAC), when NaI was used as an additive for the AlCl 3 -catalyzed conversion of glucose at 130 °C for 15 min, glucose conversion increased from 71% to 86%, and the HMF yield increased from 36% to 62%. The AlCl 3 -NaI-DMAC system could also be used for the catalytic conversion of other carbohydrates such as fructose, mannose, sucrose, maltose , cellobiose, and inulin to HMF. When sucrose was used as the feedstock, a 63% HMF yield was achieved.
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
·
2018
·
IF 0.824
Meng-Fei LAN,Ning AN,Ying ZHAO,Wei CAO,Heng LI,Lan ZHAO,Yong-Dong HUANG,Rong-Yue ZHANG
The macroporous microspheres were prepared through suspension polymerization based on a copolymer of glycidyl methacrylate and ethylene glycol dimethacrylate. The effect of porogen on the microspheres structure was evaluated in terms of pore size and surface area. Porogen contained dichloromethane ( δ = 9.7 (cal cm –3 ) 1/2 ) and N -octanol ( δ = 10.3 (cal cm –3 ) 1/2 ) which were correspond to a good and poor solvent, respectively. The solubility parameter of porogen was controlled in the range of 9.89–10.09 (cal cm –3 ) 1/2 . The pore size of microspheres increased with the increase of difference value of solubility parameter between the polymer and the porogen. On the contrary, the surface area of microspheres decreased. The anion exchange media was prepared through coupling poly(ethylene imine) in the microspheres and the proteins transport was determined by frontal analysis method. The macroporous microspheres with 257 nm pore size could still afford a high proteins capacity (45.1 mg mL –1 ). These macroporous supports showed great potential in rapid separation of proteins.
✓ 已验证
DOI
高影响因子
Journal of Semiconductors
·
2021
·Vol. 42
·期 7
·072202
·
IF 0
Wenzhe Li,Naveed Ur Rahman,Yeming Xian,Hang Yin,Yunkai Bao,Yi Long,Songyang Yuan,Yangyi Zhang,Yaxuan Yuan,Jiandong Fan
Multifunctional lead-free double perovskites demonstrate remarkable potential towards applications in various fields. Herein, an environmentally-friendly, low-cost, high-throughput Cs2NaFeCl6 single crystal with exceedingly high thermal stability is designed and grown. It obtains a cubic lattice system in the temperature range of 80–500 K, accompanied by a completely reversible chromatic variation ranging from yellow to black. Importantly, the intriguing thermochromism is proved to own extremely high reproducibility (over 1000 cycles) without a hysteretic effect, originating from its structural flexibility that including (i) the noteworthy distortion/deformation of [NaCl6]5− and [FeCl6]3− octahedra; (ii) order–disorder arrangement transition of [NaCl6]5− and [FeCl6]3− octahedra as the function of temperature. This study paves the way towards a new class of smart windows and camouflage coatings with an unprecedented colour range based on a Cs2NaFeCl6 perovskite.
✓ 已验证
DOI
Journal of Integrative Agriculture
·
2018
·
IF 1.042
Zhen YAN,Li-jing ZHENG,Ji-yun NIE,Zhi-xia LI,Yang CHENG
In order to establish grading standards of evaluation indices for sour flavor of apples, 10 indices of samples from 106 apple cultivars were tested, including: malic acid (Mal), oxalic acid (Oxa), citric acid (Cit), lactic acid (Lac), succinic acid (Suc), fumaric acid (Fum), total organic acids (ToA, the sum of the six organic acids tested), titratable acid (TiA), acidity value (AcV), and pH value. For most of the cultivars studied (85.8%), the order of the organic acid contents in apples was Mal>Oxa>Cit>Lac>Suc>Fum. Mal was the dominant organic acid, on average, accounting for 94.5% of ToA. Among the 10 indices, the dispersion of pH value was the smallest with a coefficient of variation of only 8.2%, while the coefficients of variation of the other nine indices were larger, ranging between 31 and 66%. There were significant linear relationships between Mal and two indices (ToA and AcV) as well as between ToA and AcV. There were significant logarithmic relationships between pH value and four indices: Mal, TiA, ToA, and AcV. All the equations had very high fitting accuracy and can be used to accurately predict related indices. According to this study, Mal, ToA, and AcV of apple were normally distributed, TiA was close to normally distributed, whereas pH value had a skewed distribution. Using the fitted normal distribution curves, the grading standards of Mal, TiA, ToA, and AcV were established. The grading node values of pH value were obtained using the logarithmic relationship between pH value and Mal. The grading standards of these five indices can be used to evaluate the sour flavor of apple. This study provides a scientific basis for evaluating apple flavor and selecting apple cultivars.
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
·
2017
·
IF 0.795
Fu-Xing XU,Qian-Kun DANG,Hang-Yu DING,Zheng-Xu HUANG,Yuan-Yuan WANG,Zhen ZHOU,Chuan-Fan DING
Ion trap performances were investigated based on digital ion trap technology with different collision gases and their pressures. Collision gases of helium ( M = 4 amu), nitrogen ( M = 28 amu) and argon ( M = 40 amu) with various pressures were adopted in ion excitation and dissociation stages for comparing the ion trap performances, including mass resolution, signal intensity, analysis ability of tandem mass spectrometric and low-mass cut off (LMCO) effect. The results indicated that when argon was used, the kinetic energy could be efficiently transferred and the LMCO effect was improved with higher ion capture and dissociation efficiencies except lower mass resolution. Higher mass resolution was realized with helium as collision gas. Furthermore, at the same gas pressure, heavier gas was beneficial to abundant fragment ions and structural information of precursor ion.
✓ 已验证
DOI
高影响因子
Chinese Journal of Natural Medicines
·
2025
·
IF 4.9
Yang Liu,Quanwei Sun,Xuefei Xu,Mengmeng Li,Wenheng Gao,Yunlong Li,Ye Yang,Dengke Yin
Ulcerative colitis (UC) is a chronic inflammatory disorder with a complex etiology, characterized by intestinal inflammation and barrier dysfunction. Platycodon grandiflorus polysaccharides (PGP), the primary component of Platycodon grandiflorus , and hesperidin (Hesp), a prominent active component in Citrus aurantium L. (CAL), have both demonstrated anti-inflammatory properties. This study aims to elucidate the underlying mechanism of the synergistic effect of PGP combined with Hesp on UC, focusing on the coordinated interaction between the phosphatidylinositol 3-kinase (PI3K)/protein kinase B (AKT) and Janus kinase 2 (JAK2)/signal transducer and activator of transcription 3 (STAT3) signaling pathways. A mouse model of UC induced by dextran sulfate sodium (DSS) and a cell model using lipopolysaccharide (LPS)-induced RAW264.7/IEC6 cells were employed to investigate the in vitro and in vivo anti-inflammatory effects of PGP combined with Hesp on UC and its potential mechanism of action. The results indicated that compared to the effects of either drug alone, the combination of PGP and Hesp significantly modulated inflammatory factor levels, inhibited oxidative stress, regulated colonic mucosal immunity, suppressed apoptosis, and restored intestinal barrier function in vitro and in vivo . Further in vitro studies revealed that PGP significantly inhibited the PI3K/AKT signaling pathway, while Hesp significantly inhibited the JAK2/STAT3 signaling pathway. The use of inhibitors and activators targeting both pathways validated the synergistic effects of PGP combined with Hesp on the PI3K/AKT and JAK2/STAT3 signaling pathways. These findings suggest that PGP combined with Hesp exhibits a synergistic effect on DSS-induced colitis, potentially mediated through the phosphatase and tensin homolog (PTEN)/PI3K/AKT and interleukin-6 (IL-6)/JAK2/STAT3 signaling pathways.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
European Physical Journal-Special Topics
·
2025
·
IF 2.3
Zhang Yu,Wen Yunli,Dai Yuxiang,Li Guishun,Yun Junqiang,Jing Chengbin
The susceptibility to optical instability of perovskite nanocrystals (NCs) under ambient conditions is a serious hindrance for practical applications. The conventional SiO 2 coating method for enhancing stability suffered from long reaction times and complicated preparation procedures. In this study, a facile and convenient room-temperature one-pot approach was developed to fabricate CsPbBr 3 /SiO 2 NCs, which involves the addition of tetramethoxysilane (TMOS) in advance. Owing to surface passivation, the PLQY of the CsPbBr 3 /SiO 2 NCs increased to 90% from 70% of the primitive CsPbBr 3 NCs. The SiO 2 layer formed by the TMOS hydrolysis and condensation reactions also protect the CsPbBr 3 NCs from external environment stimuli. Compared with the pristine CsPbBr 3 NCs, the air stability, structural stability, polar solvent resistance, thermal stability, and UV resistance stability of the CsPbBr 3 /SiO 2 NCs are markedly enhanced. Also, the CsPbBr 3 /SiO 2 NCs can be used as green phosphors for white light-emitting diode (WLED), which exhibits a luminous efficiency of 40 lm/W.
✓ 已验证
产品关联
DOI
高影响因子
NEW CARBON MATERIALS
·
2025
·
IF 6.8
Xiu-zhen LV,Xiang-xiang XU,Meng-meng YU,Yi-chen WEI,Jun-ying WANG,Jun-zhong WANG
The need for bi-functional catalysts that facilitate both the oxygen reduction (ORR) and carbon dioxide reduction (CO 2 RR) reactions arises from their potential to help solve the critical problems of carbon neutrality and renewable energy conversion. However, there are few reports on the development of bi-functional catalysts for zinc-air battery-driven CO 2 RR devices. We introduce a novel approach for synthesizing Fe 2 N/Fe 3 C species embedded in nitrogen-doped carbon nanofibers by electrospinning a solution of Hemin and polyacrylonitrile in N,N-dimethylformamide. The material has an exceptional catalytic performance, with a half-wave potential of 0.91 V versus RHE for the ORR and values of over 90% for both the selectivity and Faradaic efficiency for the CO 2 RR. The high catalytic performances are attributed to the strong coupling between the Fe 3 C/Fe 2 N heterostructure and the Fe-N-C sites in the nitrogen-doped carbon nanofibers. Notably, both Fe 3 C and Fe 2 N play distinct roles in both the ORR and CO 2 RR. This investigation indicates a way for designing advanced carbon-based bi-functional catalysts for use in this field.
Download: Download high-res image (61KB) Download: Download full-size image
✓ 已验证
产品关联
DOI
高影响因子
NEW CARBON MATERIALS
·
2021
·
IF 1.905
Xiang-bao Lin,Chen Hui,Jing Wu,Zhi-gang Wu,Run Li,Hong-bo Liu
Multi-wall carbon nanotubes (CNTs) were modified by nano-TiC using a pressureless spark plasma sintering technology. The TiC-modified CNTs (T-CNTs) were added to mesocarbon microbeads (MCMBs) to prepare high performance isostatically pressed graphite materials. The structures of the T-CNTs and the prepared isotropic graphite materials were characterized by XRD, SEM and TEM. The mechanical and thermal properties of isotropic graphite reinforced by T-CNTs were measured by a micro-controlled electronic universal testing machine, laser thermal conductivity meter and thermal expansion coefficient meter. Results showed that the nano-TiC was successfully grown on the surface of CNTs. Compared with the isotropic graphite prepared from MCMBs without T-CNTs, the isotropic graphite with T-CNTs has a significant improvement in physical properties (density, open porosity and volume shrinkage). Its flexural strength and degree of graphitization increased by 70% and 10%, respectively, and the thermal properties were also improved to some degree.
✓ 已验证
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2011
·Vol. 29
·期 8
·732-736
·
IF 1.086
Caixia YU,Qu YANG,Lei SHA,Yingliang LIU
An efficient and convenient one-step process was developed for synthesizing new effective red luminous materials through ordered mesoporous γ-alumina assembling with Eu 3+ . Employing P123 as a structure-directing agent and hydrochloric acid, citric acid as pH adjustor, ordered mesoporous γ-alumina was fabricated by simple sol-gel method. The pore structure was characterized by X-ray diffraction (XRD), N 2 adsorption-desorption isotherms and transmission electron microscopy (TEM). The as-synthesized γ-aluminas had narrow pore-size distribution (5–7 nm), large surface area (246 m 2 /g) and high thermal stability (750–1000 °C). The luminous property of materials was characterized by Photoluminescence (PL) spectra. The γ-Al 2 O 3 :Eu 3+ materials had efficient luminescence, and the emission strength was related to the content of Eu 3+ .
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Yuxia Liu,Yunzhen Liang,Huan Lian,Cuizong Zhang,Jinyun Peng
The electrolytic manganese dioxide - graphene (EMDG) composite was used in the construction of a sensor, which showed strong electrocatalytic activity to the oxidation of vanillin in neutral solutions. Vanillin produces an anodic peak at about 0.67 V at this electrode. Several electrochemical parameters of these processes were further carefully calculated with the results of the charge transfer coefficient α as 0.703 and the electron transferred number n as 2. The electrocatalytic behavior was further exploited as a sensitive detection scheme for the vanillin determination by differential-pulse voltammetry (DPV). Under optimized conditions, the anodic peak current increased linearly with the vanillin concentration over the range from 1.0×10 -7 to 4.5×10 -5 mol L -1 . The detection limit was calculated as 3.2×10 -8 mol L -1 (S/N=3). The proposed method was applied to the detection of biscuits and chocolates samples with satisfactory results.
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·Vol. 7
·期 11
·10825-10834
·
IF 1.5
Zhenhua Yan,Min Wang,Baoxu Huang,Jinsheng Zhao,Renmin Liu
This work discusses a low-cost and high performance catalyst of the oxygen reduction reaction (ORR) in microbial fuel cells (MFCs). The catalyst was formed by Pt–Ni (15 wt% Pt) nanoparticles dispersed on carboxyl multi-wall carbon nanotubes (Pt-Ni/MWNT). The catalyst particle presents a nano- crystalline structure and has an average diameter of ca.7.1 nm based on the X-ray diffraction and transmission electron microscopy measurement. The electrocatalytic stability and activity of the catalyst was evaluated by cyclic voltammogram and chronopotentiometry. The MFC with a Pt-Ni/MWNT cathode produced a maximum power density of 1.22 W/m 2 , which was close to that with a Pt/C (20 wt% Pt) cathode (1.40 W/m 2 ); the Coulombic efficiency reaches 31.6%, which was better than that of the Pt/C (29.3%). The total cost of a Pt-Ni/MWNT catalyst was much lower than that of a Pt/C catalyst. Thus, the Pt-Ni/MWNT probably provides a new solution for finding effective cathode materials for MFC.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）