CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Yongji Yao,Liangmiao Zhang,Zhang Chen,Chuanxiang Cao,Yanfeng Gao,Hongjie Luo
A simple two-step route is developed to fabricate hexagonal Cs x WO 3 nanoparticles . The core of this route is the preparation of the precursor by drying the mixture of WO 3 sol and CsCl , which leads to a higher Cs/W (0.32) ratio at low temperature in a short time. During reaction, oleic acid, used as a solvent, can be adsorbed on the surface of Cs x WO 3 nanoparticles, which results in small particle size (20 nm × 10 nm) and mild agglomeration. In addition, oleic acid also plays a role as a reducing agent in forming Cs x WO 3 nanoparticles without any further post-treatment. Furthermore, the film prepared from as-synthesized Cs 0.32 WO 3 nanoparticles shows excellent NIR-shielding properties (approximately 99% of the near-infrared radiation is cut off over a wavelength range of 780–2600 nm and the visible-light transmittance at 465 nm is 78.9%) when covering on an ordinary sheet of glass. A model which simulates the real environment is applied to evaluate heat-shielding performance of the Cs 0.32 WO 3 film while comparing with that of ordinary glass and commercial ITO glass (10 Ω □ −1 ). Results revealed that the Cs 0.32 WO 3 film showed superior performance than others.
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CRYSTAL GROWTH & DESIGN
·
2018
·
IF 3.972
Xiao-Ning Hu,Lin Xiong,Li-Ming Wu
The A2MIIMIV3Q8 family (A = alkali metal; MII = divalent metal; MIV = tetravalent metal; Q = chalcogenide) has attracted much attention because of its diverse structures and properties. Herein, we have successfully synthesized six new compounds as the first Mn-containing members of this family, Cs2MnGe3S8 (1), Cs2MnGe3Se8 (2), Cs2MnSn3Se8 (3), Rb2MnGe3S8 (4), Rb2MnGe3Se8 (5), and Rb2MnSn3Se8 (6). Compounds 1 and 6 crystallize in the monoclinic space group P21/n (No. 14) and P21 (No. 4), respectively, whereas compounds 2–5 crystallize in the non-centrosymmetric orthorhombic P212121 (No. 19). According to our theoretical calculations, their energy gaps are mainly dominated by s states of MIV and p states of Q and minor Mn 3d. Plate-like crystals with sizes about 20 × 5 × 1 mm3 of 2 and 3 are obtained by the Bridgeman method. In addition, we propose a structure mismatch factor that is defined as F = rMII+ rMIV + 2rQ2– – 2rA+ to provide a clear description of how three different structure types distribute among the A2MIIMIV3Q8 family; when 1.2 < F < 1.9, members will adopt a P212121-type structure; when F is too small (<1.2) or too large (>1.9), P21/n or P21-type, respectively, will be taken.
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Particuology
·
2018
·
IF 2.785
Jinbiao Yang,Tiesen Li,Xiaojun Bao,Yuanyuan Yue,Haiyan Liu
A rapid and environmentally friendly approach to synthesize hierarchical sodalite from natural aluminosilicate mineral without the involvement of any mesoporogen or post-synthesis treatment was developed. This strategy involves three important steps: the first is the depolymerization of an aluminosilicate mineral into highly reactive silicon and aluminum species with ideal meso-scale structures through activation of a sub-molten salt. The second step is the hydrolysis and condensation of the activated aluminosilicate mineral into zeolitic precursors that also have a meso-scale structure. The third is the rapid zeolitization of the zeolitic precursors through the reversed crystal growth route at room temperature and ambient pressure to form hierarchical sodalite. The physicochemical properties of the as-synthesized sodalite were systematically characterized, and the formation mechanism of the hierarchical pore structure was discussed. When used as a solid base catalyst for Knoevenagel condensation, the as-synthesized sodalite and its potassium ion-exchanged product with hierarchical micro–meso–macroporous structure both exhibited high catalytic activity and product selectivity.
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CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Wen Li,Wen Deng,Xiaoqiang Fan,Fengjun Chun,Meilin Xie,Chao Luo,Shiyu Yang,Hanan Osman,Chuanqi Liu,Xiaotong Zheng,Weiqing Yang
All-inorganic perovskite nanocrystals have held great promise as incredibly effective luminescent materials and also have been synthesized efficiently by room temperature approaches. Toluene, a high toxicity solvent, is often used as a valid antisolvent in ligand-assisted reprecipitation strategy, which badly restricts the commercial application of this convenient method. Here, aiming to address the toluene toxicity issue, the low toxic tetraethyl orthosilicate (TEOS) is employed as a new alternative antisolvent to achieve high uniform and composition dependent luminescent all-inorganic perovskite Cs 4 PbX 6 (X = I, Br, Cl) combined with CsPbX 3 (X = I, Br, Cl) nanocrystals with tunable emission large-span wavelengths (626–437 nm) and remarkably narrow full width at half-maximum (FWHM) monochromaticity (down to 19 nm). Meanwhile, the ratio of CsBr to PbBr 2 is proved to be a critical factor to control the crystalline phase of the resulting perovskite nanocrystals . Additionally, one monochromatic light-emitting diode (LED) lamp with brightly pure green emission is fabricated based on bromine-based perovskite nanocrystals. This newly developed low toxicity antisolvent synthesis (LTaS) is suitable candidate for commercial production in an environmentally-friendly way, and the as-obtained perovskite materials with superior optical merits will be brought to the forefront of lighting and displays.
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JOURNAL OF PHYSICS D-APPLIED PHYSICS
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2018
·Vol. 51
·期 29
·295107
·
IF 2.373
Jun Zhang,Jun Liao,Lexi Shao,Shuwen Xue,Zhiguo Wang
High quality micron-sized Cu2FexZn1−xSnS4 single crystals have been successfully fabricated by flux growth method using CuS, FeS, ZnS and SnS as the raw materials and CsCl as the fluxing agent. The effects of Fe contents on the morphology, structure and optical properties of Cu2FexZn1−xSnS4 single crystals were investigated. X-ray diffraction and Raman analyses reveal that the kesterite and stannite phases coexist in the Cu2FexZn1−xSnS4 crystals, and peak splittings of (2 0 4) and (3 1 2) are observed for the sample with x = 0.2. The optical absorption spectra reveal that the optical bandgap of the single crystal samples has little dependence on the Fe content due to the coexistence of the kesterite and stannite phases. The bandgap of the Cu2FexZn1−xSnS4 single crystal generally locates between 1.672 and 1.716 eV. Though the bandgap is not ideal as the absorber for single-junction solar cells according to the S–Q limit, it is an ideal material for the top cell in tandem solar cells and solar-driven water splitting.
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JOURNAL OF HAZARDOUS MATERIALS
·
2018
·
IF 6.434
Kexin Wang,Hui Ma,Shengyan Pu,Chun Yan,Miaoting Wang,Jing Yu,Xiaoke Wang,Wei Chu,Anatoly Zinchenko
Easy-to-obtain magnetic bentonite-chitosan hybrid beads (Bn-CTS) were prepared by immobilizing bentonite within a porous structure of chitosan beads to achieve a hybrid adsorption effect for the removal of cesium ion (Cs + ) from water. The hybrid adsorbent, which had a porous structure and abundant binding sites contributed by both chitosan and bentonite, ensured superb adsorption characteristics. The paramagnetic character of the beads enabled their facile separation for recycling. The chitosan/bentonite ratio, pH and contact time were optimized to achieve the optimal Cs + efficiency, and the adsorption kinetics and isotherms were thoroughly discussed. The adsorption kinetics obeyed the pseudo-second-order model, and the best fitted equation for equilibrium data was the Langmuir isotherm model. The maximum adsorption capacity of the bentonite-chitosan beads was 57.1 mg g −1 . The adsorbent had excellent selectivity towards Cs + adsorption in the presence of abundant cations (Li + , Na + , K + and Mg 2+ ). The adsorbent was able to be recycled by treating the beads with 0.1 mol L −1 of MgCl 2 to quantitatively desorb Cs + from the beads. Overall, the magnetic bentonite-chitosan beads can be used as a highly efficient adsorbent for radioactive waste disposal and management.
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Science China-Chemistry
·
2018
·Vol. 61
·期 12
·1581-1586
·
IF 4.448
Hu Qingsong,Deng Zhenzhou,Hu Manchen,Zhao Anjiang,Zhang Yaqi,Tan Zhifang,Niu Guangda,Wu Haodi,Tang Jiang
Metal halide perovskites have shown great performance for various applications, including solar cells, light emitting diodes, and radiation detectors, but they still suffer from the toxicity of lead and instability. Here we report the use of lanthanide series as trivalent metals to obtain low toxicity and highly stable double perovskites (Cs 2 NaLnCl 6 , Ln=Tb or Eu) with high scintillation light yield. The crystals exhibit typical f-f transitions of lanthanide cations, while Cs 2 NaTbCl 6 exhibits strong green photoluminescence, and Cs 2 NaEuCl 6 exhibits red photoluminescence. Under X-ray radiations, the light yield of Cs 2 NaTbCl 6 reaches 46600 photons MeV −1 , much higher than that of the commercially used (Lu,Y) 2 SiO 5 :Ce 3+ crystals (LYSO, 28500 photons MeV −1 ), and previously reported lead-based perovskites (14000 photons MeV −1 ). As a new member of lead-free perovskites, lanthanide-based double perovskites open up a new route toward radiation detections and potential medical imaging.
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OPTICS EXPRESS
·
2018
·Vol. 26
·期 16
·20649-20660
·
IF 3.356
Maosen Yang,Jing Yu,Shouzhen Jiang,Chao Zhang,Qianqian Sun,Minghui Wang,Hang Zhou,Chonghui Li,Baoyuan Man,Fengcai Lei
The novel fluorescent nanofiber membranes of CsPbX3 (FNMs/CPX, X = Cl, Br, I) with a wide photoluminescence range from 405 nm to 675 nm are fabricated by a one-step electrospinning method in this paper. Owing to the polymer cladding, these FNMs/CPX show much better thermal and humid stability compared to the common CsPbX3 particles, and the corresponding white light-emitting diode prepared by them also exhibits excellent optical properties. Without adopting any complicated processes, this method opens up a brand new way for the perovskite materials using in lighting and display fields.
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CHEMICAL ENGINEERING SCIENCE
·
2018
·
IF 3.306
An Chen,Shao-Wei Li,Dian Jing,Jian-Hong Xu
Non-ionic surfactants are widely used in many industrial applications such as detergents, oil recovery, and mineral flotation techniques. Non-ionic surfactants readily adsorb onto the oil-water interface, although they cannot dissociate in solutions like ionic surfactants can. Nonetheless, the electrostatic double-layer (EDL) repulsive force between oil drops coated with the non-ionic surfactant can still provide stability against coalescence. In this work, the interaction forces between two tetradecane drops with diameter of 6.5 µm were measured in the presence of the non-ionic fluorocarbon-based surfactant FS-30 in various salt solutions using optical tweezers. The measured force curves were consistent with the presence of a surface charge, even though the surfactant was non-ionic in nature. The results clearly show that the EDL repulsive force is gradually screened with increasing salt concentration. It was also found that the EDL repulsive force was significantly screened in the divalent cation salt solutions (Ca 2+ , Ba 2+ ) in comparison to in the monovalent cation salt solutions (Na + ). In addition, the absolute value of the measured zeta potential ( − ξ ) of emulsified tetradecane drops gradually decreased with increasing FS-30 concentration. In all experimental processes, the emulsified tetradecane drops coated with FS-30 were stable against coalescence. These findings have significant implications for the stability of emulsions used in the food, cosmetic, and detergent industries.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2018
·Vol. 20
·期 39
·25476-25481
·
IF 3.906
Shenglong Chu,Shusheng Pan,Guanghai Li
CsPbCl3 is a promising material to construct future short wavelength optoelectronic devices based on inorganic perovskite semiconductors. In this study, CsPbCl3 microcrystals were synthesized by a solution phase process. It was found that the photoluminescence (PL) intensities of the CsPbCl3 microcrystals can increase by up to five times under persistent irradiation of UV light without peak shifting, accompanied with an increased absorption coefficient above the band gap and decreased PL lifetime. This PL enhancement is a reversible process with excitation light switching on and off. The photoactivation process of the CsPbCl3 microcrystals is attributed to the passivation of the trap states.
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INORGANIC CHEMISTRY
·
2018
·
IF 4.7
Yibao Chen,Maxim S. Molokeev,Victor V. Atuchin,Ali H. Reshak,Sushil Auluck,Zeyad A. Alahmed,Zhiguo Xia
Exploring new perovskite-related solid-state materials and the investigating composition-dependent structural and physical properties are highly important for advanced functional material development. Herein, we present the successful hydrothermal synthesis of tetragonal CsPb2Cl5 and the anion-exchange phase formation of CsPb2(Cl1–xBrx)5 (x = 0–1) solid solutions. The CsPb2(Cl1–xBrx)5 crystal structures, which crystallize in the tetragonal system, space group I4/mcm, with parameters similar to those of CsPb2Cl5, have been determined by Rietveld analysis. The optical band gap was obtained by UV–vis spectroscopy, and the band structure was further calculated by the full-potential method within the generalized gradient approximation. It was revealed that the band gap in CsPb2(Cl1–xBrx)5 solid solutions can be tuned over the range of 4.5–3.8 eV by anion substitution.
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Scientific Reports
·
2018
·Vol. 8
·期 1
·1-13
·
IF 4.122
Cheng Xingan,Ye Jingmin,He Huiqing,Liu Zhanmei,Xu Chunbao (Charles),Wu Bo,Xiong Xialing,Shu Xugang,Jiang Xuhong,Qin Xiangjing
Matrine is a traditional Chinese medicine and botanical pesticide with broad biological activities, including pharmacological and agricultural activities. In present work, two matrine derivatives have been successfully synthesized via introducing indole and cyclohexylamino to 13 position of matrine, respectively, with sophocarpine as starting material, and structurally characterized via infrared spectroscopy(IR), MS, 1 H NMR, 13 C NMR and X-ray crystal diffraction. The results of the in vitro biological activity tests showed that these two matrine derivatives exhibited even better activities against human cancer cells Hela229 and insect cell line Sf9 from Spodoptera frugiperda (J. E. Smith) than that of parent matrine, suggesting that the heterocyclic or cyclic group can dramatically increase the biological activity of matrine. It is worth to mention that 13-indole-matrine could possibly inhibit the growth of insect cells or human cancer cells by inducing cell apoptosis. The results of the present study provide useful information for further structural modifications of these compounds and for exploring new, potent anti-cancer agents and environment friendly pesticides.
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