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R. Spatz und E. Roggendorf 《Fresenius' Journal of Analytical Chemistry》1979,299(4):267-270
Zusammenfassung Der Einsatz verschiedener ternärer Lösungsmittelmischungen als mobile Phase in der Reversed-Phase-Hochdruckflüssigkeits-Chromatographie wird beschrieben. Am Beispiel der Trennung von ausgewählten PTH-Aminosäuren (Phe-Lys, Phe-Ile, Val-Met) konnte gezeigt werden, daß durch ternäre Lösungsmittelmischungen selektive Trennungen erreicht werden, die mit binären Systemen nicht möglich waren. Am besten bewährt hat sich Acetatpuffer-Acetonitril-Dimethylsulfoxid (503020).
Ternary solvent systems for the separation of PTH amino acids by reversed-phase high pressure liquid chromatography
Summary The use of ternary solvent systems as mobile phases in the HPLC separation of selected PTH-amino acids (phe-lys, phe-ile, val-met) is described and it is shown that resolutions are obtained which cannot be achieved with binary phases. The system acetate buffer — acetonitrile — dimethylsulphoxide (503020) has proved to be most satisfactory.相似文献
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《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2017,129(12):3210-3215
Tobermorite is a fibrillar mineral of the family of calcium silicates. In spite of not being abundant in nature, its structure and properties are reasonably well known because of its interest in the construction industry. Currently, tobermorite is synthesized by hydrothermal methods at mild temperatures. The problem is that such processes are very slow (>5 h) and temperature cannot be increased to speed them up because tobermorite is metastable over 130 °C. Furthermore the product obtained is generally foil‐like and not very crystalline. Herein we propose an alternative synthesis method based on the use of a continuous flow reactor and supercritical water. In spite of the high temperature, the transformation of tobermorite to more stable phases can be prevented by accurately controlling the reaction time. As a result, highly crystalline fibrillar tobermorite can be obtained in just a few seconds under thermodynamically metastable conditions. 相似文献
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《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2017,129(9):2453-2457
The solvent‐free mechanical milling process for two distinct metal–organic framework (MOF) crystals induced the formation of a solid solution, which is not feasible by conventional solution‐based syntheses. X‐ray and STEM‐EDX studies revealed that performing mechanical milling under an Ar atmosphere promotes the high diffusivity of each metal ion in an amorphous solid matrix; the amorphous state turns into the porous crystalline structure by vapor exposure treatment to form a new phase of a MOF solid solution. 相似文献
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Jia-Yan Liang Dr. Xu-Dong Zhang Dr. Xian-Xiang Zeng Dr. Min Yan Prof. Ya-Xia Yin Prof. Sen Xin Wen-Peng Wang Dr. Xiong-Wei Wu Dr. Ji-Lei Shi Prof. Li-Jun Wan Prof. Yu-Guo Guo 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2020,132(16):6647-6651
A hybrid solid/liquid electrolyte with superior security facilitates the implementation of high-energy-density storage devices, but it suffers from inferior chemical compatibility with cathodes. Herein, an optimal lithium difluoro(oxalato)borate salt was introduced to build in situ an amorphous cathode electrolyte interphase (CEI) between Ni-rich cathodes and hybrid electrolyte. The CEI preserves the surface structure with high compatibility, leading to enhanced interfacial stability. Meanwhile, the space-charge layer can be prominently mitigated at the solid/solid interface via harmonized chemical potentials, acquiring promoted interfacial dynamics as revealed by COMSOL simulation. Consequently, the amorphous CEI integrates the bifunctionality to provide an excellent cycling stability, high Coulombic efficiency, and favorable rate capability in high-voltage Li-metal batteries, innovating the design philosophy of functional CEI strategy for future high-energy-density batteries. 相似文献
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Ran Su H. Alex Hsain Ming Wu Dawei Zhang Xinghao Hu Zhipeng Wang Xiaojing Wang Fa‐tang Li Xuemin Chen Lina Zhu Yong Yang Yaodong Yang Xiaojie Lou Stephen J. Pennycook 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(42):15220-15225
Piezocatalysis, converting mechanical vibration into chemical energy, has emerged as a promising candidate for water‐splitting technology. However, the efficiency of the hydrogen production is quite limited. We herein report well‐defined 10 nm BaTiO3 nanoparticles (NPs) characterized by a large electro‐mechanical coefficient which induces a high piezoelectric effect. Atomic‐resolution high angle annular dark field scanning transmission electron microscopy (HAADF‐STEM) and scanning probe microscopy (SPM) suggests that piezoelectric BaTiO3 NPs display a coexistence of multiple phases with low energy barriers and polarization anisotropy which results in a high electro‐mechanical coefficient. Landau free energy modeling also confirms that the greatly reduced polarization anisotropy facilitates polarization rotation. Employing the high piezoelectric properties of BaTiO3 NPs, we demonstrate an overall water‐splitting process with the highest hydrogen production efficiency hitherto reported, with a H2 production rate of 655 μmol g?1 h?1, which could rival excellent photocatalysis system. This study highlights the potential of piezoelectric catalysis for overall water splitting. 相似文献
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Xiaoyu Chen Zumin Wang Yanze Wei Xing Zhang Qinghua Zhang Lin Gu Lijuan Zhang Nailiang Yang Ranbo Yu 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(49):17785-17788
The crystal phase plays an important role in controlling the properties of a nanomaterial; however, it is a great challenge to obtain a nanomaterial with high purity of the metastable phase. For instance, the large‐scale synthesis of the metallic phase MoS2 (1T‐MoS2) is important for enhancing electrocatalytic reaction, but it can only be obtained under harsh conditions. Herein, a spatially confined template method is proposed to synthesize high phase‐purity MoS2 with a 1T content of 83 %. Moreover, both the confined space and the structure of template will affect the purity of 1T‐MoS2; in this case, this approach was extended to other similar spatially confined templates to obtain the high‐purity material. The obtained ultrathin nanosheets exhibit good electrocatalytic activity and excellent stability in the hydrogen evolution reaction. 相似文献