研究目的
To investigate how the reaction rate influences the crystallization process and to synthesize silver particles with controllable shapes by selecting the crystallization routes.
研究成果
The study confirmed the role of reaction kinetics in switching the crystallization routes, leading to the formation of diverse morphologies of silver particles. This understanding can enhance the ability for rational synthesis of material structures.
研究不足
The study focuses on the synthesis of silver particles with specific morphologies and their application in ethylene epoxidation. The generalizability to other materials or reactions is not explored.
1：Experimental Design and Method Selection
Silver particles were synthesized by a solution-based reduction approach, using hydroxylamine to reduce silver ions. The reduction rate was regulated by adding amino acids as complexation agents.
2：Sample Selection and Data Sources
Silver nitrate and amino acids were used as starting materials. The evolution of silver particles was monitored by taking samples at different reaction times.
3：List of Experimental Equipment and Materials
JSM-7001F Thermal Field Scanning Electron Microscope, JEM-2100 (UHR) Transmission Electron Microscope, Mili-Q system for deionized water, freeze drier (Christ ALPHA 1-2 LD plus), pH electrode (Mettler-Toledo S470 Seven Excellence pH/Conductivity meter).
4：Experimental Procedures and Operational Workflow
Silver nitrate and amino acids were dissolved in deionized water, then hydroxylamine solution was added to initiate the reduction. The solution was taken out at different reaction times, frozen in liquid nitrogen, and dried by freeze drier.
5：Data Analysis Methods
The morphologies of silver products were characterized by SEM and TEM. The reduction rates were quantified by measuring the pH change during reaction.
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