Solar RRL
·
2024
·Vol. 8
·期 7
·2400021
·
IF 6
De'en Guo,Xiaohan Yu,Zhenxing Fang,Heng Peng,Haipeng Xie,Han Huang,Deming Kong,Conghua Zhou
Interfacial contact between “perovskite/electron-transport layer” (PVSK/ETL) has appeared as a bottleneck for the hole-conductor-free, mesoscopic perovskite solar cells (meso-CPSCs) based on carbon electrode, especially for the low-temperature devices. To solve this problem, hydroxypropyl-β-cyclodextrin is imported to TiO 2 -based ETL. It is observed that this treatment improves the wettability of ETL, enhances the crystallization processes of PVSK in the mesoporous skeleton, and strengthens the interfacial contact between “PVSK/ETL”. Besides, defects are reduced at the interface. Accordingly, charge extraction is accelerated, while recombination is retarded. Transient photovoltage/photocurrent decay curve test shows that the charge-extraction time decreases from 3.75 (±0.38) to 3.42 (±0.22) μs, while lifetime of photogenerated charges in device is prolonged from 10.00 (±2.38) to 12.23 (±1.86) μs, which helps to upgrade power μconversion efficiency from 9.38 (±1.28)% to 11.42 (±0.80)% (optimized at 12.44%). The efficiency is further upgraded to 14.04% after modifying the carbon electrode with octylammonium iodide. Such efficiency catches up with 85% of that of high-temperature meso-CPSCs (prepared at 450 °C) when using (5-AVA) x (MA) 1− x PbI 3 as light absorber. The study paves the way to further upgrade the efficiency of the low-temperature meso-CPSCs.
研究领域:
材料科学
·
光伏技术
·
纳米科技
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Cheng Meng,Wenqi Li,Chunrong Ren,Junchuan Zhao
Powellite ceramic represent one candidate to immobilize minor actinides and Mo from reprocessed UMo nuclear fuel. In this work, the Ca 1-x Li x/2 Ce x/2 MoO 4 (0 ≤ x ≤ 1) series is prepared via a solid-state reaction using Ce 3+ as trivalent minor actinide (Am 3+ ) surrogate, with structure/microstructure characterized by XRD , XPS, HRTEM , and SEM as well. The Ca 1-x Li x/2 Ce x/2 MoO 4 (0 ≤ x ≤ 1) compositions crystallize in tetragonal and are isostructural with scheelite. Rietveld refinements show that Ce 3+ and Li + simultaneously enter into the eight-fold coordinated Ca site of powellite crystal. The chemical durability of powellite phases is evaluated by the ASTM C1285-14 product consistency test method B. The leaching behaviours of Ce and Mo are accordance with the interfacial dissolution-reprecipitation mechanism. For all the Ca 1-x Li x/2 Ce x/2 MoO 4 (0 ≤ x ≤ 1) ceramics, 7-days NL Ce and NL Mo are found to be in the order of 10 −3 -10 −5 g·m −2 and 10 −2 -10 −4 g·m −2 respectively, which exhibit the great retention of Ce and Mo. Interestingly, the values of 7-days NL Ce and NL Mo are predominantly controlled by the distortion of MoO 4 tetrahedra and disordered arrangements of Ce 3+ and Li + . Thus, our initial understanding on the structure and chemical durability relation will provide insight to design new waste forms for the Mo-rich HLW condition.
研究领域:
材料科学
·
核废料管理
·
陶瓷工程
·
化学工程
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DOI
高影响因子
Biomaterials Science
·
2020
·Vol. 8
·期 9
·2682-2693
·
IF 6.183
Yuanbiao Tu,Ji Tao,Fang Wang,Peifei Liu,Zhihao Han,Zhaolun Li,Yi Ma,Yueqing Gu
Pancreatic cancer has a high mortality rate and efforts towards diagnosis and therapy at an early stage are particularly appealing. Recently, a small peptide, BBN7–14, has attracted much attention for its specific binding ability to gastrin releasing peptide receptor (GRPR), which is highly overexpressed in various types of cancer, including pancreatic cancer. However, its poor stability in vivo restricts its direct clinical application. Herein, by rational design and transformation of BBN7–14, a novel six-amino acid peptide, GB-6, which maintains a specific GRPR-binding feature and exhibits enhanced stability in vitro and in vivo, was designed. Competitive binding with BBN7–14 and cellular uptake related to GRPR expression levels verified the specific affinity of GB-6 to GRPR. Additionally, this novel peptide was conjugated with near-infrared dye and the radionuclide 99mTc for pancreatic cancer diagnosis in cells and in vivo. Surprisingly, despite having the same cellular affinity as BBN7–14, GB-6 showed much higher pancreatic cancer-targeting ability than BBN7–14 by both fluorescence imaging and radionuclide imaging. It was proven that this strange phenomenon was attributed to the distinct in vivo stability of GB-6 and its more favorable pharmacokinetic properties and metabolic stability relative to BBN7–14. Altogether, this novel peptide GB-6, with GRPR-targeting ability and enhanced stability, is a more promising candidate for the clinical diagnosis of pancreatic cancer.
研究领域:
肿瘤学
·
分子生物学
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药学
·
医学影像学
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产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 41
·16314-16321
·
IF 3.069
Feifei Li,Luyao Wang,Mengmeng Li,Lin Lei
Herein, hydrophilic encapsulation of reduced graphite oxide (r-GO) was achieved by admicellar polymerization. Functional polymer thin films were coated on the r-GO surface for enhancing the water dispersion of r-GO. The morphology was observed by TEM and SEM. Moreover, a PHEMA thin film was coated on the surface of r-GO by admicellar polymerization using a surfactant at low concentration. The percentage of the film coated on r-GO was calculated to be 40 wt% by thermal analysis. FT-Raman has been applied to illustrate that admicellar polymerization is a nondestructive functionalization method. The water contact angles decreased from 105° to 63° after admicellar polymerization; this indicated the successful hydrophilic encapsulation of r-GO. Moreover, r-GO/PHEMA-modified glassy carbon (r-GO/PHEMA/GC) functioned well as an electrochemical biosensor for the detection of hemopexin-like domain of matrix metalloproteinase 14 (PEX-14).
研究领域:
材料科学
·
分析化学
·
生物传感技术
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产品关联
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2025
·
IF 3.8
Chen Bo,Liang Deshen,Yu Huilan,Liu Changcai,Yuan Ling,Wang Fengyun,Liu Shilei
For the implementation of the Chemical Weapons Convention, the Organisation for Prohibition of Chemical Weapons (OPCW) designates laboratories for the analysis of chemicals that can be used as chemical warfare agents (CWAs). In these laboratories, analytical methods for detecting CWAs have been developed for environmental and biomedical samples. Protein adducts from exposed biomedical samples are an important type of biomarker for verification of their abuse. Moreover, these adducts could also be applied in chemical impurity profiling studies of biomedical samples. Alkylating agents, as cytotoxicants, can react with Cys 34 in human serum albumin, and cysteine-proline-phenylalanine (CPF) tripeptide adducts generated from proteinase K digestion of modified albumin have been used as biomarkers for retrospective detection of exposure to sulfur mustards or nitrogen mustards. In this study, a sensitive screening method for detecting exposure to 14 alkylating agents in one analytical run was established through sample preparation and instrumental detection optimization. Ultrahigh-performance liquid chromatography–triple quadrupole mass spectrometry (UHPLC–TQ MS) operated in multiple reaction monitoring (MRM) mode and combined with an optimized chromatographic program was used for detecting the 14 corresponding CPF tripeptide adducts. The limits of detection (LODs) are in the range of 0.200–10.0 ng/mL exposure concentrations in human plasma. This method could also allow impurity profiling applicable for potential attribution of sulfur and nitrogen mustard in plasma through retrospective analysis of exposed biomedical samples with impurity compositions as low as 0.1%. This method has potential in clinical diagnosis, CWA verification and forensic identification applications. Graphical
研究领域:
分析化学
·
毒理学
·
临床医学
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产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2015
·
IF 1.964
Yan Li,Bing Li,Ting Chen,Zhicheng Zhou,Jun Wang,Jun Huang
A vanadium doped graphitic carbon nitride catalyst has been prepared and used for the direct hydroxylation of arenes with O 2 . Substituted arenes with electron-withdrawing groups such as CN, NO 2 , COOH, CF 3 , and COCH 3 were oxygenated to the corresponding phenols in moderate yields. The catalyst also proved applicable for the hydroxylation of aromatic halides (F, Cl, and Br) with O 2 .
研究领域:
化学
·
催化科学
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DOI
高影响因子
Chinese Journal of Natural Medicines
·
2014
·
IF 0
De-Biao YAN,Dong-Ping ZHANG,Ming LI,Wen-Yuan LIU,Feng FENG,Bin DI,Qing-Long GUO,Ning XIE
To synthesize a series of 3-, 4-, and/or 11-trihydroxy modified bergenin derivatives and evaluated their cytotoxic activity in vitro . The phenolic hydroxyl groups of bergenin were protected by benzyl groups with benzyl bromide. Treatment of dibenzyl bergenin with the corresponding acid in the presence of EDC·HCl and DMAP in CH 2 Cl 2 , followed by hydrogenation over Pd/C catalysts, afforded derivatives of bergenin esters. All of the target compounds were identified by IR, MS, and 1 H NMR. Twenty-six novel and three known derivatives of bergenin esters were synthesized. Their cytotoxicity values were evaluated by the MTT assay on the inhibition of DU-145 and BGC-823 cells in vitro . Several triply-substituted ( 3a, 4a, 5a, 6a, 7a ) and doubly-substituted ( 8b, 9b ) bergenin derivatives exhibited higher cytotoxic activity than bergenin. The result showed that the size of substituents and the lipophilicity of the bergenin esters displayed an important role on their cytotoxic activity.
研究领域:
药物化学
·
肿瘤学
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DOI
PubMed
RARE METAL MATERIALS AND ENGINEERING
·
2014
·
IF 0.153
Zhiqiang Zhou,Guo Li,Peiyun Jia
GdVO 4 :Eu 3+ nanophosphors were prepared via molten salt synthesis. Equal moles of NaNO 3 and KNO 3 were used as reaction medium, rare earth nitrates and NH 4 VO 3 as precursors, and NaOH as alkalizer. X-ray diffraction (XRD), Fourier transform infrared (FT-IR), transmission electron microscopy (TEM), photoluminescence (PL) spectrum and lifetime were used to characterize the nanophosphors. XRD demonstrates that NaOH concentration and the sintering temperature play important roles in the crystallinity and the phase purity of the products. The optimum NaOH concentration and sintering temperature are 2:40 and 400 °C, respectively. TEM micrographs show that the GdVO 4 :Eu 3+ nanocrystals exhibit a cubic morphology and have a mean size of about 20 nm, which is in good agreement with that calculated by Scherrer's formula. Both the cell parameters and the volume of GdVO 4 :Eu 3+ nanocrystals decrease due to the existence of big quantity of dangling bonds on the particle surface. Upon excitation at 315 nm, the GdVO 4 :Eu 3+ nanocrystals show the strong characteristic emission of Eu 3+ , which indicates the efficient energy transfer from VO 4 3- groups to Eu 3+ . The best doping concentration of Eu 3+ in GdVO 4 is determined to be 5 mol%.
研究领域:
材料科学
·
纳米技术
·
光学
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DOI
高影响因子
CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
·
2014
·
IF 0.7
Yue XU,Chun-Jing TANG,Hong HUANG,Chao-Qun SUN,Ya-Kun ZHANG,Qun-Feng YE,Ai-Jun WANG
Fluorescent carbon quantum dots (CQDs) were synthesized by one-step hydrothermal treatment with apple juice as raw material. The result indicated that the fluorescence could be quenched by Hg 2+ with high specificity. Based on this phenomenon, a selective and sensitive sensor was constructed for the detection of Hg 2+ in phosphate solutions (pH 7.0). The fluorescence intensity showed linear responses with Hg 2+ concentration ranging from 5.0 to 100.0 nM and 1.0 to 50.0 μM, with the detection limit of 2.3 nM ( S / N = 3). The as-fabricated sensor was further extended for the determination of Hg 2+ in real water samples.
研究领域:
分析化学
·
环境科学
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DOI
高影响因子
RARE METAL MATERIALS AND ENGINEERING
·
2014
·
IF 0.153
Cao Xingxing,Zhang Xuebin,Shao Hao,Feng Yi
Ferroferric oxide nanotubes were prepared by calcining and reducing the composite nanofiber precursors fabricated by electrospinning. Influences of the electrospun parameters (PVA concentration of solution, applied voltage and collector distance) on the preparation of the composite nanofiber precursors were discussed. The structural properties of the obtained nanotubes were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The formation mechanism of the Fe 3 O 4 nanotubes was investigated through the nonequilibrium heat-treatment procedure. Furthermore, the magnetic property of Fe 3 O 4 was measured using a vibrating sample magnetometer. Results reveal that the tubes show a uniform and continuous morphology, whose outer and inner diameters are about 100 nm and 50 nm, respectively. Fe 3 O 4 possesses saturation magnetization ( M s ) of 54.2 A·m 2 /kg, coercivity ( H c ) of 215×79.6 A/m and remanent magnetization ( M r ) of 12.8 A·m 2 /kg, respectively.
研究领域:
材料科学
·
纳米技术
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DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2014
·
IF 1.552
Ming Ge
A visible-light-driven Ag 3 PO 4 catalyst was successfully synthesized by a facile ion-exchange route. The as-synthesized Ag 3 PO 4 was characterized by X-Ray diffraction (XRD), field-emission scanning electron microscopy, N 2 adsorption-desorption, UV-Vis diffuse reflectance spectroscopy and Fourier transform infrared spectroscopy . Under visible light irradiation , the Ag 3 PO 4 catalyst showed excellent photocatalytic activity for rhodamine (RhB) degradation, but was poor at degrading methyl orange (MO) because of lower adsorption of MO molecules onto the surface of the Ag 3 PO 4 . The photodegradation of RhB and MO was achieved by holes and O 2 •− radical attack in the Ag 3 PO 4 suspension. The photodegradation of MO over the Ag 3 PO 4 catalyst was greatly enhanced in the presence of RhB owing to greater production of O 2 •− radicals.
研究领域:
环境化学
·
光催化
·
材料科学
·
环境功能材料
·
污染物降解
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DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2014
·Vol. 32
·期 5
·429-433
·
IF 1.342
Xilin ZHU,Shumin HAN,Xin ZHAO,Yuan LI,Baozhong LIU
Hydrogen storage properties of 2LiNH 2 -MgH 2 system were improved by adding lanthanum hydride (LaH 3 ), and the role of LaH 3 in hydrogen sorption process of Li-Mg-N-H system was investigated. Temperature programmed sorption results showed that the addition of lanthanum hydride reduced the dehydriding/hydriding onset temperature of 2LiNH 2 -MgH 2 system by at least 15 K. Moreover, A 0.053 wt.%/min average rate was determined for the hydrogen desorption of 2LiNH 2 -MgH 2 -0.05LaH 3 composite, while it was only 0.035 wt.%/min for 2LiNH 2 -MgH 2 system. Hydrogen absorption capacity increased from 1.62 wt.% to 2.12 wt.% within 200 min by adding LaH 3 into 2LiNH 2 -MgH 2 system at 383 K. In the dehydrogenation of 2LiNH 2 -MgH 2 -0.05LaH 3 composite, LaH 2 transferred to LaN phase, which reversed to LaH 2 in the following hydrogen adsorption process. The reversible reaction of LaH 2 effectively promoted the hydrogen sorption of Li-Mg-N-H system. Moreover, the homogenous distribution of fine La hydride was favorable to improving effect of lanthanum hydride.
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DOI
高影响因子
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