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High-Pressure Studies On The Transition From Red Phosphorus To Black Phosphorus, Heng Xiang
High-Pressure Studies On The Transition From Red Phosphorus To Black Phosphorus, Heng Xiang
Electronic Thesis and Dissertation Repository
Black phosphorus (BP) is a promising material in many research fields. However, the transition process from amorphous red phosphorus (ARP) is elusive and hence hinders large scale synthesis and applications. This work describes the application of the high-pressure method to study the transition process from ARP to BP.
In this thesis, the following three objectives were achieved: (1) to understand the mechanism of the transition, (2) to facilitate the synthesis of BP by taking the advantage of less pure ARP, (3) to propose new methods of synthesizing BP-based materials, such as the moderately oxidized BP and the black phosphorus/ amorphous …
Investigations Of The Crystallization Processes Of Molecular Sieves, Lu Zhang
Investigations Of The Crystallization Processes Of Molecular Sieves, Lu Zhang
Electronic Thesis and Dissertation Repository
Molecular sieves have been used extensively in industrial fields. A better understanding of their crystallization processes is very useful for controlling the structural properties in order to meet the industrial needs. This thesis focuses on examining the crystallization of several catalytically important molecular sieves by dry gel conversion (DGC) method which includes steam-assisted conversion (SAC) and vapor-phase transport (VPT), or hydrothermal synthesis (HTS) method or a combination of both.
For SAPO-34 templated by DEA, it crystallizes similarly under SAC and VPT conditions. It forms from the transformation of a semi-crystalline layered phase. When morpholine was used as the template, the …