INORGANIC CHEMISTRY
·
2021
·
IF 5.165
Rongzhen Xie,Nannan Shen,Xijian Chen,Jie Li,Yaxing Wang,Chao Zhang,Chengliang Xiao,Zhifang Chai,Shuao Wang
99Tc is one of the most abundant radiotoxic isotopes in used nuclear fuel with a high fission yield and a long half-life. Effective removal of pertechnetate (TcO4–) from an aqueous solution is important for nuclear waste separation and remediation. Herein, we report a series of facilely obtained benzene-linked guanidiniums that could precipitate TcO4– and its nonradioactive surrogate ReO4– from a high-concentration acidic solution through self-assembly crystallization. The resulting perrhenate and pertechnetate solids exhibit exceptionally low aqueous solubility. The benzene-linked guanidiniums hold one of the highest TcO4– removal capacities (1279 mg g–1) among previously reported materials and possess a removal percentage of 59% for ReO4– in the presence of Cl– over 50 times. The crystallization mechanism was clearly illustrated by the single-crystal structures and density functional theory calculations, indicating that TcO4– is captured through a charge-assisted hydrogen bonding interaction and stabilized by π–π stacking layers. In addition, the removal process is easily recycled and no toxic organic reagents are introduced. This work provides a green approach to preliminarily separate TcO4– from high-level nuclear wastes.
研究领域:
化学
·
环境科学
·
核能工程
✓ 已验证
DOI
PubMed
高影响因子
SOLAR ENERGY
·
2020
·
IF 4.608
Bing Liu,Rongli Cui,Huan Huang,Xihong Guo,Shouwei Zuo,Jinquan Dong,Huanli Yao,Ying Li,Dangui Zhao,Jiahao Wang,Jing Zhang,Yu Chen,Junliang Yang,Baoyun Sun
The crystal structure of perovskite has a significant influence on the photovoltaic performance and stability of perovskite solar cells (PSCs). Pb 4+ is introduced into CH 3 NH 3 PbI 3 (MAPbI 3 )-based PSCs by participating the octahedral [PbI 6 ] 4- structure, then to induce the formation of stronger Pb-I bond and reduce [PbI 6 ] 4- octahedron distortion, which would improve structural symmetry, decrease the degree of disorder and be beneficial to the crystallization of perovskites . Synchrotron based X-ray absorption fine spectroscope (XAFS) revealed that the existence of higher valence state lead could be realized by doping Pb 4+ directly or induced by electron withdrawing group, in consequence the [PbI 6 ] 4- octahedral structure becomes more stable. Grazing incidence X-ray diffraction (GIXRD) especially demonstrates that Pb 4+ with appropriate proportion may well replace part of Pb 2+ to form an uniform phase in the primal perovskite structure to improve the crystallization on the surface and homogeneous out-of-plane (OOP) ordered crystal accumulation in the bulk, which is also important for improving the efficiency and stability of PSCs. As a result, a power conversion efficiency (PCE) exhibits a 42.1% increase with the doping of 0.03% PbF 4 and 0.075% PCBM compared with a pristine device and its stability improves markedly after 30 days of storage in ambient atmosphere.
研究领域:
材料科学
·
能源研究
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED PHYSICS
·
2017
·Vol. 121
·期 12
·
IF 2.068
Wu Lei,Dai LiDong,Li HePing,Hu Haiying,Zhuang YuKai,Liu KaiXiang
We present a pressure-induced amorphization for pure and 0.5 mol. % Bi 3+ -doped Zn 2 GeO 4 samples, measured by high pressure Raman spectroscopy and high resolution transmission electron microscopy. Pressure-induced conductivity switching phenomena were discovered for both samples at around ∼7.01 GPa and ∼11.11 GPa, respectively, which closely correlated with the crystalline-to-amorphous transformation. The detailed conduction mechanism and the defect reaction process at high pressure indicate that the application of pressure could efficiently manipulate the microstructure and electrical performance of rare-earth doped polycrystalline materials, and therefore holds great promise for numerous applications in the future.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF FOOD PROPERTIES
·
2017
·
IF 1.427
Yun Ma,Bing Zhang,Hongyan Li,Yulu Li,Jiangning Hu,Jing Li,Hongming Wang,Zeyuan Deng
Honey crystallization is a natural phenomenon commonly found in honey products. To better understand the characteristics of honey crystallization, the concentrations of the four major compositions (namely glucose, fructose, sucrose, and maltose) were determined in the liquid, crystal, and mixed forms of honey. Our study revealed the contents of glucose and fructose in three forms varied significantly (p < 0.05). Molecular dynamics simulation was performed to investigate honey crystallization process. All the simulation systems had a tendency to form a cubic crystal. When the ratio of glucose/fructose is 2.5:1, which is the same as the crystal found in honey, a shorter time and lower root-mean-square deviation were found compared to the ratios at 2:1, 1:1, and pure glucose. It infers that glucose/fructose at 2.5:1 is the most stable honey crystallization, relatively. The morphology of crystals found in honey, which was observed under an environment scanning electron microscope, looked like sticky balls with indistinct edges, different from that plates or granule of glucose crystal with flattened edges. These results indicated that the relative content of glucose and fructose had a significant effect on the crystallization of honey. The glucose/fructose at 2.5:1 probably is the critical ratio of honey crystallization, at which honey can form stable crystalline deposit speedily.
研究领域:
食品科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2025
·
IF 7.2
Suwen Cheng,Yupeng Zhang,Ying Chu,Yanchen Wang,Yuan Xie,Chen Yu,Jingjin Dong,Jiupeng Cao,Fangfang Wang,Wei Huang,Aifei Wang,Tianshi Qin
Hybrid halide perovskite films are becoming increasingly efficient in various applications, but several challenges still remain to be overcome. In this study, thermally polymerized additive N-vinyl-2-pyrrolidone (NVP) is utilized to tune the crystallization and orientation of mixed organo-metal perovskite films. Using in situ spectroscopy, it is demonstrated that NVP plays a crucial role in prolonging the crystallization process and separating the nucleation and crystal growth by forming an NVP-precursor intermediate phase. Additionally, the intermediate adduct effectively passivates defects, reduces nonradiative recombination, improves crystallinity, and enhances the transmission of charge carriers. NVP-containing perovskite light-emitting diodes (PeLEDs) are subsequently developed that exhibit stable and bright green luminance exceeding 240 000 cd m −2 . These findings provide valuable insights into manipulating the crystallization behavior of mixed organo-metal perovskite films.
研究领域:
材料科学
·
光电技术
✓ 已验证
产品关联
DOI
高影响因子
Crystals
·
2022
·Vol. 12
·期 3
·334
·
IF 2.67
Jingyun Hu,Xinping Zhang
We report dependence of random lasing performance of directly spin-coated multicrystalline thin films of an organic–inorganic hybrid, halide perovskite CH3NH3PbBr3(MAPbBr3), on different substrates. It was discovered that random lasing performance is strongly dependent on the surface energy properties of the substrate, which determine the morphology and crystallization properties of the spin-coated film, and will consequently determine its optical scattering and emission properties. Using indium–tin oxide (ITO)-coated glass, fused silica, and tricyclo[5.2.1.02,6] decanedimethanol diacrylate (ADCP)-coated fused silica as the substrate materials, we compared the spectroscopic response of the random lasers and thus justified the photophysical mechanisms involved. The modification of the surface properties of the substrate enables controlling of the MAPbBr3crystallization and leads to the changing of the random lasing properties. The discoveries herein are also important for the construction of other types of laser devices, where the substrate effects should be considered during the design and preparation of the micro-/nano structures.
研究领域:
光学
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2021
·Vol. 37
·期 5
·1137-1142
·
IF 1.307
Zhao Lei,Yang Ge,Guo Hailing,Wang Chunzheng,Wang Lijuan,Mintova Svetlana
T he relationship between the concentration of sodium cations and the properties of faujasite(FAU) zeolite was investigated using a two-step synthesis procedure including (1) formation of amorphous aluminosilicate precursors and separation of amorphous nanoparticles, and (2) transformation of these amorphous particles into zeolite crystals by treatment with alkali solutions(NaOH). Three representative samples including two nano-sized zeolites and one micron-sized zeolite were prepared using different concentrations of sodium hydroxide. The crystallization process of these zeolites was studied in detail by Fourier transform infrared(FTIR) spectrometry, nuclear magnetic resonance spectroscopy(NMR), X-ray diffraction(XRD), scanning electron microscopy (SEM), transmission electron microscopy(TEM), and N 2 adsorption. The results indicated that minor changes in the concertation of inorganic cations can significantly shorten the induction period and crystallization time and thus affect the morphology, size and chemical composition of the zeolite crystals.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2022
·
IF 3.407
Peng Chen,Xin Shan,Xin Lin,Heyan Yuan,Yangyang Xie,Fang Wang,Kailiang Zhang
Bi 2 O 2 Se has attracted a lot of attention in the field of photodetection due to its ultra-high mobility and tunable band gap. However, the mechanism of controllable preparation of high-quality Bi 2 O 2 Se is unclear and needs further investigation. In this paper, the concentration of reactants in the substrate region was increased by the method of space-compression, the number of nucleation was effectively controlled, and larger size Bi 2 O 2 Se was obtained. And the nucleation and selenylation mechanisms of Bi 2 O 3 were revealed based on the effect of temperatures modificatives growth of Bi 2 O 2 Se. And the controlled growth was achieved in a certain thickness range by increasing the reactant concentration in the substrate region and controlling the nucleation number. Moreover, photodetectors were constructed based on the highly crystalline Bi 2 O 2 Se. The photodetector exhibited a photoresponsivity of up to 9550 A/W under the excitation of 405 nm light and obtained highly stable and recoverable characteristics with multiple laser switches.
研究领域:
材料科学
·
光电技术
✓ 已验证
DOI
高影响因子
Particuology
·
2025
·
IF 4.3
Yayuan Zheng,Hao Lv,Xinka He,You Zhou,Cheng Gou,Huaiming Du,Ping Zhu
The application of sodium dihydrogen phosphate (NaH 2 PO 4 ) in drinking water and food processing underscores the importance of its crystallization process, which significantly affects product quality and yield. In this study, the dynamic laser method was used to explore the solubility and super-solubility of NaH 2 PO 4 in H 2 O-ethylene glycol (EG) binary systems of different proportions. We first applied the Apelblat, Van't Hoff, and NIBS-RK models to correlate solubility data and identified the best-fitting model. Then, the Mersmann and Barata models were used to determine the solid-liquid surface tension and crystal surface entropy factor. The Van't Hoff model calculated the molar enthalpy, entropy of dissolution, and Gibbs free energy. Experimental results showed that dissolution is endothermic and spontaneous, mainly driven by enthalpy changes, while crystallization is exothermic, providing key data for kinetics research. In the kinetics analysis, NaH 2 PO 4 crystallization was found to be linearly correlated growth, with the logarithm of crystal particle number density positively related to particle size. Comparing the CR and ASL models, the ASL model better reflects the growth rate. The derived nucleation and growth kinetics models indicated that growth and nucleation rates are positively correlated with temperature and supersaturation ratio. During cooling crystallization, the supersaturation ratio has a greater impact on the growth rate than the nucleation rate and a more significant effect on nucleation than suspension density and stirring rate. This research offers valuable guidance for high-quality NaH 2 PO 4 industrial production.
研究领域:
化学工程
·
食品科学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2020
·
IF 4.019
Ji Lei,Lo-Yueh Chang,Zhaohui Dong,Lijia Liu
Caesium lead bromide perovskite nanocrystals (PNCs) are synthesized using a room-temperature sonochemical method. By mixing equimolar of CsBr and PbBr 2 in Dimethylformamide (DMF), PNCs of CsPbBr 3 structure are formed. Under an identical reaction condition, when EuBr 2 is introduced with the CsBr/PbBr 2 precursor, the resulted product (Eu-PNCs) becomes zero-dimensional Cs 4 PbBr 6 nanocrystals. In addition to the typical green emission observed in both CsPbBr 3 and Cs 4 PbBr 6 , Eu-PNCs has a blue emission band. The overall photoluminescence quantum yield is much higher than the pristine PNCs. We perform detailed analysis of the crystal structure and luminescence properties of the nanocrystals with and without EuBr 2 modification. An X-ray absorption fine structure analysis reveals the local structure of Eu in the PNCs. We propose that the cation-solvent interaction strongly influences the crystallization process of ternary Cs x Pb y Br z , and the formation of Eu-solvent complexes further modifies the PNCs surface resulting in unique luminescence properties.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2021
·
IF 6.165
Zilong Cui,Zhiruo Zhao,Liang Yao,Yonghong Hu
Brassinolide is a new environmental protection plant growth regulator. With the aim of knocking down selfcost and scale up agriculture market-place emulation, come what will manufacture method is adopted, the final step crystallization is significant for getting exclusive substances. The purpose of this study is to provide some authentic and general energetics data for the actual industrial production of brassinolide. In the research, the solid–liquid equilibrium of brassinolide in twelve pure solvents (tetrahydrofuran, dimethyl sulfoxide, ethanol, acetone, methanol, trichloromethane, acetonitrile, 1-butanol, isopropanol, xylenes, n-hexane and n-heptane) and three binary solvent mixtures (trichloromethane + tetrahydrofuran, acetonitrile + tetrahydrofuran and n-hexane + tetrahydrofuran) were tested by the circumstance of atmosphere pressure at range temperatures between 278.15 K and 323.15 K. Four models like the Buchowski–Ksiazaczak λh model, the modified Apelblat model, the Jouyban-Acree-van't-Hoff model and the Redich-Kister (CNIBS/R-K) model were employed to describe the change trend of solubility. On the groundwork of a series of data analysis, tetrahydrofuran is a better organic solvent and n-hexane can be applied as an effective anti-solvent when separating out brassinolides. These solubility data are very important for optimizing the extraction process and recrystallization of brassinolide.
研究领域:
植物学
·
农业科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NON-CRYSTALLINE SOLIDS
·
2022
·
IF 4.458
Buyue Zhao,Haiming Huang,Qunjiao Chen
Ceramic fibers have played an important role in the thermal protection field of aerospace vehicles at high-temperature over the past decades. In this work, Y 2 Si 2 O 7 precursor fibers were prepared by electrospinning and characterized. The spinning solution consisted of yttrium nitrate, tetraethyl orthosilicate , and polyvinyl alcohol. The microstructure and elements distribution of fibers was investigated by scanning electron microscopy. The decomposition of organic components and crystallization process of yttrium silicate were explored by thermogravimetry-differential scanning calorimetry. The phase composition of fibers was analyzed by X-ray diffraction. The results showed the fibers were composed of uniform tiny grains after calcined at 1000 °C and the phase of the fibers was α-Y 2 Si 2 O 7 . The size of grains increased with increasing calcination temperature and the intact fibrous structure was maintained. The average diameter of the precursor fibers was 1383 ± 345 nm and decreased to 786 ± 171 nm after calcined at 1300 ℃. Elements distribution was uniform in the fibers, confirming a good homogeneity of the fibers.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）