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
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
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 CHEMICAL THERMODYNAMICS
·
2023
·
IF 2.6
Zhuangzhuang Chen,Yuqing Ma,Ning Fang,Min Ge,Yuan Su,An Chen,Shuai Yu,Ting Cai
Crystallization is widely used for the isolation and purification of active pharmaceutical ingredients (APIs) in the final manufacturing stage. Bazedoxifene (BZD) acetate, classified as a third-generation selective estrogen receptor modulator, is employed in the treatment of postmenopausal osteoporosis. This work reports the equilibrium solubility data of BZD acetate in fifteen different mono-solvents, including methanol, ethanol, n -propanol, i -propanol, n -butanol, ethyl formate, methyl acetate, ethyl acetate, acetone, 2-butanone, cyclohexanone, tetrahydrofuran (THF), 2-methyltetrahydrofurane (2-MeTHF), 1,4-dioxane and acetonitrile (ACN), within the temperature range “ T = 283.15–323.15 K” under p = 0.1 MPa. The solubilities of BZD acetate in various solvents increase with increasing temperature. Among the alcoholic solvents, the solubility order is as follows: methanol > ethanol > n -propanol > n -butanol > i -propanol. In esters solvent, the solubility of BZD acetate decreases in the following order: methyl acetate > ethyl acetate > ethyl formate. For ketones solvent, the solubility decreases in the following order: cyclohexanone > acetone > 2-butanone. The maximum value of BZD acetate solubility was 0.011 mol·mol −1 in tetrahydrofuran at T = 323.15 K, but the least data was found in ethyl formate at 283.15 K. Four thermodynamic models, i.e., the Yaws model, modified Apelblat model, λ h model, and Wilson model were applied to fit the solubility data of BZD acetate in different solvents. Among them, the Wilson model represents the most accurate fitting outcomes. Finally, the thermodynamic functions of mixing (including enthalpy, entropy, and Gibbs energy) were calculated, and the results indicate a mixing process that is both spontaneous and driven by entropy. The solubility data, correlated models, and derived thermodynamic functions present essential thermodynamic fundamentals for the industrial production of BZD acetate crystallization, facilitating efficient separation and purification.
研究领域:
制药工程
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2024
·
IF 27.4
Jinyi Li,Yang Liu,Jiejun Zeng,Siyu He,Xitong Zhu,Xiaoyue Sun,Yizheng Jin
Tin-based perovskites are more environmentally friendly than their lead-based alternatives. Perovskite light-emitting diodes (PeLEDs) using iodide-based tin perovskites have achieved considerable advancements in efficiency. However, PeLEDs using bromide-based tin perovskites have not progressed as rapidly, primarily due to challenges in controlling their crystallization processes. Here, an interfacial reaction-assisted crystallization method is introduced to achieve bright and efficient CsSnBr 3 PeLEDs. It is started by forming an intermediate phase through the coordination of SnBr 2 with ethylenediamine derivatives. Subsequently, a protonation reaction is designed between the intermediate phase and the acidic polyethylenedioxythiophene: poly(styrene sulfonate) hole-transport layer to generate high-quality CsSnBr 3 films. Additionally, the use of potassium thiocyanate additives effectively enhances the photoluminescence efficiency of the CsSnBr 3 films. These efforts result in CsSnBr 3 -based PeLEDs achieving a maximum luminance of 787 cd m −2 and a peak external quantum efficiency of 0.91%, demonstrating the most efficient and brightest CsSnBr 3 -based PeLEDs to date. This work opens an avenue to better control the crystallization of tin-based perovskite.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
OPTICS EXPRESS
·
2021
·Vol. 29
·期 10
·14894-14904
·
IF 3.894
Guanhua Ren,Guanhua Ren,Guanhua Ren,Guanhua Ren,Lu Zhou,Lu Zhou,Ligang Chen,Ligang Chen,Ligang Chen,Liyuan Liu,Liyuan Liu,Jianbing Zhang,Jianbing Zhang,Hongwei Zhao,Hongwei Zhao,Hongwei Zhao,Jiaguang Han,Jiaguang Han
Terahertz spectroscopy provides a powerful and informative link between infrared spectroscopy and microwave spectroscopy, and is now beginning to make its transition from initial development to broader use by chemists, materials scientists and biologists. In this study, utilizing terahertz spectroscopy we monitored the crystallization and isomerization of azobenzene. In flash-frozen trans-azobenzene solutions, the processes of crystallization and phase transition were observed. A new phase has been experimentally confirmed to exist stably at low temperatures. The results on gradual-frozen experiment indicate that the formation of the observed new phase is determined by the cooling rate. Besides, based on the distinctive spectral features of the isomers, the thermal- and photo-induced isomerization processes of azobenzene were investigated. This work presents that the terahertz spectroscopy has a great potential to study the phase transitions and crystallization of liquid samples under different freezing conditions.
研究领域:
化学
·
材料科学
·
光谱学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2017
·
IF 6.395
Jiabin Qi,Hao Xiong,Gang Wang,Huaqing Xie,Wei Jia,Qinghong Zhang,Yaogang Li,Hongzhi Wang
Crystallization and interface engineering of perovskite are the most important factors in achieving high-performance perovskite solar cells (PSCs). Herein, we construct an ultrathin CdSe quantum dots (QDs) underlayer via a solution-processable method, which acts as a seed-mediated layer for perfect perovskite film, with both uniform morphology and better absorption capacity . In addition, CdSe QDs and perovskites form a fully crystalline heterojunction , which is beneficial to minimizing the defect and trap densities . Then, an Ostwald ripening process is adopted to fabricate large-grain, pinhole-free perovskite thin film , by a simple methylammonium bromide treatment. Besides, the first principle is applied in calculating organic/inorganic hybrid perovskite, confirming that electrons can move even quicker and more effectively, as a result of our work. Due to these treatments, representing a very simple method to simultaneously control perovskite crystallization and optimize the interfaces in PSCs, a maximum power conversion efficiency of 15.68% is achieved, 35% higher than the PSC both without CdSe and MABr treatment (11.57%), indicating better performance.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
CRYSTAL RESEARCH AND TECHNOLOGY
·
2021
·Vol. 56
·期 8
·2100053
·
IF 1.639
Xingsheng Zong,Xiyun He,Xia Zeng,Pingsun Qiu,Liang Ling,Ying Shi
Pure perovskite Pb 0.92 La 0.08 (Zr 0.68 Ti 0.32 ) 0.98 O 3 (PLZT (8/68/32)) crystal powders with good dispersibility are prepared by using gel-hydrothermal method. The effects of mineralizer concentration, hydrothermal treatment time, and excess lead content on powder crystallization and morphology are examined and analyzed. The suitable mineralizer concentration and hydrothermal treatment time are found to be helpful to promote the PLZT crystal powders growth and improve the particle surface morphology. Noticeably, the introduction of excessive Pb can well compensate for the lack of A-site ions in the solution, thereby promoting the formation of rhombohedral PLZT crystal powders. The following optimized hydrothermal conditions are established: the temperature ≈230 °C, the mineralizer concentration ≈2 m , the hydrothermal treatment time ≈24 h, and the amount of excess Pb ≈ 80%. The obtained PLZT crystal powders with clean and complete cube morphology, uniform particle size, and excellent dispersibility would be used as the crystal seeds applying in the seed-induced growth of PLZT ceramics.
研究领域:
材料科学
·
无机化学
✓ 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）