JOURNAL OF CHEMICAL RESEARCH
·
2013
·
IF 0.596
Liang Zhou,Yuanfeng Liu,Zhenhong He,Yanping Luo,Feng Zhou,Erlei Yu,Zhenshan Hou,Wumanjiang Eli
An efficient reaction of epoxides with carbon dioxide to generate the corresponding cyclic carbonates employing pentaerythritol/KI, does not need solvent.
研究领域:
化学
·
催化反应
✓ 已验证
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2018
·Vol. 18
·期 4
·2931-2937
·
IF 1.354
Zhu Changhao,Ma Xiaoe,Ma Dandan,Zhang Tianzhu,Gu Ning
For computed tomography (CT) angiography and drug release application, a kind of novel dextran hydrogel microspheres were prepared. β-cyclodextrin (β-CD) grafted poly(methyl vinyl ether-altmaleic acid) (PMVE-alt-MA-g-β-CD) and succinic acid modified
dextran (Dex-SA) were first prepared, and then PMVE-alt-MA-g-β-CD was further used as the cross-linking agent to cross link Dex-SA for the formation of dextran hydrogel microspheres by using an inverse suspension polymerization method for the potential interventional embolization.
The average diameter of the dextran hydrogel microspheres was 35 μm with 90% ranging from 20 μm to 50 μm. The obtained microspheres showed a rather high swelling rate and loading capacity of drug doxorubicin hydrochloride with content of 9.2 wt%. The results of
in vitro experiments showed that about 35.5% of the total amount of the encapsulated doxorubicin hydrochloride can be released after 4 h at 37 °C. The microspheres had a good mechanical stiffness with Young’s modulus of about 20.0 kPa. Iodine molecules (I2) can
be incorporated within the cavity of grafted cyclodextrin only through simply soaking in I2 aqueous solution, and these I2-loaded microspheres can preliminarily realize the function of CT angiography. This kind of dextran hydrogel microspheres with good biocompatibility would be
a promising embolization material.
研究领域:
生物材料学
·
医学影像学
·
药剂学
✓ 已验证
DOI
PubMed
高影响因子
CRYSTAL GROWTH & DESIGN
·
2023
·
IF 3.8
Huijuan Zhang,Wenyan Luo,Zaichun Sun,Chunya Li
Bismuth oxyiodides have been gradually regarded as a kind of promising optoelectronic material, owing to their various merits, like relatively narrow and tunable band gap, high anisotropic crystal structure, and less toxicity. However, the investigation of bismuth oxyiodide-based photodetectors is still in the early stage, which might be attributed to the immature film deposition techniques in controlling their phase composition and surface morphology. In this work, high-quality Bi4O5I2 thin films were synthesized for the first time by a facile solution-based deposition technique, mist chemical vapor deposition. The synthesized Bi4O5I2 thin films were composed of vertically aligned nanoplatelets. With the increasing synthesis temperatures, the size of the nanoplates and film thickness increased. The iodide content was influenced by the synthesis temperatures such that the I:Bi molar ratio for the Bi4O5I2 thin films at intermediate temperature was close to 50%. The Bi4O5I2 photoelectrochemical (PEC)-type photodetectors were fabricated and exhibited excellent photodetection performance with the highest responsivity of 19.4 mA/W and detectivity of 3.54 × 1010 Jones. In addition, Bi4O5I2 PEC-type photodetectors presented good long-term stability in that the photocurrent density only decreased by around 25% after 6 h, which was superior to most 2D material-based PEC-type photodetectors. These results demonstrated that the Bi4O5I2 thin film has great potential in high-performance optoelectronic devices.
研究领域:
材料科学
·
光电子学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Chen-Yan Hu,Ye-Ye Zhu,Bin Xu,Tian-Yang Zhang,Yi-Li Lin,Cun Xiong,Qiang-Bing Wang,Dan-Dan Huang,Ling Xu
This study explored the degradation of an iodine X-ray contrast media , iohexol, under heterogeneous ozone-catalyzed oxidation by adding Fe 3 O 4 and 1-hydroxybenzotriazole (HBT). Results show that increasing the dosages of Fe 3 O 4 catalyst and ozone as well as solution pH were beneficial to the degradation of iohexol. The presence of low background humic acid (HA) concentration (≤10 mg/L) promoted iohexol degradation, but high HA concentration (≥20 mg/L) inhibited it. Adding HBT exhibited a similar effect on iohexol degradation as HA. The degradation rate constant of iohexol was calculated as 0.07108 min −1 in the Fe 3 O 4 /O 3 /HBT process ([HBT] = 5 μM) at pH 7.0, which was approximately 1.5 times higher than that in the Fe 3 O 4 /O 3 process (0.04533 min −1 ), and 4 times higher than that in the O 3 process (0.01742 min −1 ). Fe 3 O 4 /O 3 /HBT process was pH-dependent with high degradation efficiency of iohexol at pH 5 or 7. Singlet oxygen ( 1 O 2 ), hydroxyl radical ( OH ∙ ), and superoxide radical ( O 2 - ∙ ) have been identified in the Fe 3 O 4 /O 3 /HBT process, and the conversion of Fe 2+ to Fe 3+ was more obvious on the surface of Fe 3 O 4 compared to that in the Fe 3 O 4 /O 3 process. Transformation intermediates were identified, and the degradation pathways of iohexol were proposed. Overall, Fe 3 O 4 /O 3 could enhance iohexol degradation compared with ozone-only system, and adding trace HBT in Fe 3 O 4 /O 3 system can further enhance heterogeneous ozone-catalyzed process for rapid organic matter degradation.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
RADIOCHIMICA ACTA
·
2021
·Vol. 110
·期 3
·193-203
·
IF 1.44
Wenhong Han,Guilin Wei,Yi Liu,Xirui Lu,Shunzhang Chen,Zhentao Zhang,Yi Xie,Xiaoyan Shu
A new glass solidification process aims at radioactive iodine waste was explored in order to reduce the possible harm to environment. Samples with different iodine content in silver-coated silica gel were pretreated by hydration device at 300 °C and then sintered at relatively low temperatures (500, 550 and 600 °C). XRD results show that AgI is mainly chemically fixed in the glass network with some AgI particles being physically wrapped by the glass. Moreover, as the sintering temperature reached to 550 °C, B element crystallized. SEM-EDS results show that Ag and I elements are enriched, while the other elements are evenly distributed. AFM results showed that the sample surface becomes rougher as the iodine content increases in the silver coated silica gel. The FT-IR results show that the structure of the sintered sample is mainly composed of [BiO 3 ], [BiO 6 ] and [BO 3 ]. This study provides a new sintering method by hydration device for the treatment of radioactive iodine waste.
研究领域:
材料科学
·
核废物处理
✓ 已验证
DOI
高影响因子
CELLULOSE
·
2022
·Vol. 29
·期 10
·5547-5556
·
IF 6.123
Yan Ning,Zhang Yu-Ting,Chai Xin-Sheng,Lu Zhao-Qing
This paper proposed a derived spectroscopic technique for determining the surface charge of lignocellulosic fiber. In this method, chitosan quaternary ammonium iodide with higher molecule weight was selected to minimize its interaction with the negative charge inside of fiber pores. It was based on spectroscopically measuring the UV absorbance of I − (the counter ion) in the filtrates from a set of solutions that containing the fixed amount of fibers and the different amount of cationic polymer (from under- to over-saturation). By plotting the derived absorbance at 245 nm versus the volume of chitosan addition, a transition point is determined, from which the fiber surface charge can be calculated. The results showed that the present method has a good measurement precision (RSD < 3.24%) and accuracy (relative differences < 3.11%, when compared with the conductivity titration method). It is suitable to be used for determining the surface charge of lignocellulosic fibers.
研究领域:
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 8
·期 6
·3145-3153
·
IF 10.733
Bing Liu,Rongli Cui,Huan Huang,Xihong Guo,Jinquan Dong,Huanli Yao,Ying Li,Dangui Zhao,Jiahao Wang,Jing Zhang,Yu Chen,Baoyun Sun
In this study, the stability mechanism of the optimized methyl ammonium lead triiodide (CH3NH3PbI3, MAPbI3)/[6,6]-phenyl-C61-butyric acid methyl ester (PCBM) perovskite active layer upon exposure to moisture, light, and heating was investigated. For the first time, the existence of high-valence lead arising from PCBM is confirmed by X-ray absorption fine spectroscopy (XAFS) based on synchrotron radiation, which helps to form stronger Pb–I bonds and facilitate carrier transport. Moreover, the degree of disorder of perovskites and the [PbI6]4− octahedral distortion are significantly improved, as well as the crystallization both on the surface and in the bulk. The result of this study provides a fundamental understanding of the functions of additives with electron-withdrawing properties (e.g., PCBM) in perovskite materials and could specifically be extended to systematically design and fabricate high-efficiency and stable solar cells.
研究领域:
材料科学
·
光伏技术
·
物理化学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2017
·
IF 4.857
Bing-Ping Yang,Chun-Li Hu,Fei-Fei Mao,Xiang Xu,Jiang-Gao Mao
Two new barium gold iodates, namely, BaAu(IO3)5 and HBa4Au(IO3)12, have been prepared. BaAu(IO3)5 crystallizes in the polar space group Pca21, whereas HBa4Au(IO3)12 crystallizes in the centrosymmetric space group P21/c. BaAu(IO3)5 consists of unique polar [Au(IO3)4]− anions whose four iodate groups are located at both sides of the AuO4 plane and the polarity points in the [001̅] direction. BaAu(IO3)5 displays strong second-harmonic-generation (SHG) effects about 0.6KTiOPO4 (KTP) and is phase-matchable. Thermal properties, optical spectra analyses, and theoretical calculations are also reported.
研究领域:
材料科学
·
化学
·
物理学
✓ 已验证
DOI
PubMed
高影响因子
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
·
2024
·Vol. 121
·期 23
·e2403544121
·
IF 9.4
Jing-Hang Wu,Tian-Hao Yang,Yi-Jiao Sun,Yuan Min,Yi Hu,Fei Chen,Jie-Jie Chen,Han-Qing Yu
Peracetic acid (PAA) is emerging as a versatile agent for generating long-lived and selectively oxidative organic radicals (R–O•). Currently, the conventional transition metal–based activation strategies still suffer from metal ion leaching, undesirable by-products formation, and uncontrolled reactive species production. To address these challenges, we present a method employing BiOI with a unique electron structure as a PAA activator, thereby predominantly generating CH3C(O)O• radicals. The specificity of CH3C(O)O• generation ensured the superior performance of the BiOI/PAA system across a wide pH range (2.0 to 11.0), even in the presence of complex interfering substances such as humic acids, chloride ions, bicarbonate ions, and real-world water matrices. Unlike conventional catalytic oxidative methods, the BiOI/PAA system degrades sulfonamides without producing any toxic by-products. Our findings demonstrate the advantages of CH3C(O)O• in water decontamination and pave the way for the development of eco-friendly water decontaminations based on organic peroxides.
研究领域:
环境科学
·
化学
✓ 已验证
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Xiao Xu,Juan Cui,Liangwei Fu,Yi Huang,Yong Yu,Yi Zhou,Di Wu,Jiaqing He
SnTe is deemed a promising mid-temperature thermoelectric material for low toxicity, low cost, and decent performance. Sole doping/alloying on Sn sites was reported to result in either modified band alignment or reduced lattice thermal conductivity, thus contributing to an enhanced overall thermoelectric figure of merit. However, this strategy alone is always unable to take full use of the material’s advantage, especially considering that it simultaneously pushes the hole concentration off the optimal range. In this work, we adopted a two-step approach to optimize the thermoelectric performance of SnTe in order to overcome the limitation. First, Mn was alloyed into Sn sites to increase the density of state effective mass of SnTe by regulating the valence bands; the Fermi level was further regulated by iodine doping, guided by a refined two-band model. Additionally, the lattice thermal conductivity was also suppressed by the microstructure optimizing via Mn doping and additional phonon scattering at ITe mass/strain fluctuation. As a result, a high ZT of 1.4 at 873 K was achieved for Sn0.91Mn0.09Te0.99I0.01. This study provides a way to refine the single doping stratagem used in other thermoelectric materials.
研究领域:
材料科学
·
热电材料优化
✓ 已验证
DOI
PubMed
高影响因子
ANALYTICA CHIMICA ACTA
·
2018
·
IF 5.123
Ruifeng Peng,Haibo He,Qian Wang,Xiaoxia Yan,Qiongwei Yu,Haixiao Qin,Yunyi Lei,Liqiang Luo,Yuqi Feng
In this study, we proposed a novel anti-aggregation of gold nanoparticles (AuNPs) strategy for colorimetric sensing of iodide ions (I − ) regulated by the redox reaction between the target ions and the ion cross-linking agent. Cu 2+ as interlinking ion can induce aggregation of arginine capped AuNPs (Arg-AuNPs) due to the formation of Arg-Cu 2+ -Arg analogous structure resulting from the chelation between Cu 2+ and arginine, with a clear color change of solution from red to blue. In the presence of I − , however, Cu 2+ would be readily reduced owing to the formation of CuI, AuNPs underwent a transformation from an aggregation to a dispersion state depending on the concentration of I − , leading color changes from blue to red. The corresponding color variation in the process of anti-aggregation of AuNPs can be monitored through UV–vis spectrophotometer or by the naked-eye, making quantitative analysis of I − feasible in a convenient colorimetric or visual way. The assay only took 5 min, showing high sensitivity with a lowest detectable concentration of 10 nM and excellent selectivity for I − over other anions tested, which was successfully applied for the detection of I − in drinking water and table salt samples.
研究领域:
分析化学
·
纳米技术
·
环境科学
✓ 已验证
DOI
高影响因子
VACUUM
·
2022
·
IF 4.11
Cong Peng,Baizhen Qian,Qianliu Yin,Meifeng Xu,Yonglong Jin,Chaonan Wang,Xiyuan Ma,Tian Xu
The photoelectronic materials of hybrid organic-inorganic halide perovskite (HHPs) materials are an important research field. However, the defects on the surface of perovskite films need to be solved. For organic-inorganic halide perovskite materials, oxygen passivation has been regarded as an effective and convenient method to inhibit non-radiative recombination. In this paper, the unannealed CH 3 NH 3 PbI 3 precursor films were passivated by oxygen plasma for different irradiation times. The prepared perovskite films have large grain sizes, lower trap density, improved crystallinity, and strong absorption. The J-V curve shows that the HHPs solar cells with oxygen treatment increase the solar cell's overall photoelectric conversion efficiency (PCE) from 10.24% to 14.23%. Experimental results and analysis demonstrate that oxygen plasma successfully passivates the surface defects of perovskite, minimizes non-radiation recombination, and enhances device stability.
研究领域:
材料科学
·
太阳能电池技术
·
光电子学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）