Shape Controllable Synthesis of Silver Particles by Selecting the Crystallization Routes

IF 2.6 4区 材料科学 Q3 ENGINEERING, CHEMICAL KONA Powder and Particle Journal Pub Date : 2020-01-10 DOI:10.14356/KONA.2020004
Jianmei Liu, Q. Lin, Yu Zhou, J. Dai, Yongsheng Han
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引用次数: 6

Abstract

Classic crystallization describes a burst nucleation followed by a layer-by-layer atom deposition. The non-classic crystallization refers to particle mediated crystallization process. Different crystallization routes lead to the formation of diverse structured materials. Here we report a rational synthesis of silver particles by selecting the crystallization routes. Silver particles were synthesized by a solution reduction approach. The crystallization routes were regulated by adding amino acids to stabilize silver ions which leads to the decrease of the reduction rate. Without amino acids, silver dendrites were largely formed. With the addition of amino acids, flower-like (low concentration of amino acids) and spherical silver (high concentration of amino acid) particles were synthesized. Three kinds of amino acids were tested and the similar results were obtained. The time-dependent characterization on the evolution of silver particles showed that silver dendrites were formed by the classic atom deposition while the other two morphologies were formed by the combination of classic and non-classic crystallization. The silver particles synthesized were evaluated for ethylene epoxidation and the dendritic particles demonstrated a high selectivity.
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选择结晶路线合成形状可控的银颗粒
经典结晶描述的是一个爆发成核,接着是一层接一层的原子沉积。非经典结晶是指粒子介导的结晶过程。不同的结晶路径导致不同结构材料的形成。本文报道了一种通过选择结晶路线来合理合成银粒子的方法。采用溶液还原法制备了银颗粒。通过加入氨基酸来稳定银离子,调节结晶路线,使还原速率降低。没有氨基酸,银树突就基本形成了。通过氨基酸的添加,合成了花状(低浓度的氨基酸)和球形银状(高浓度的氨基酸)颗粒。对三种氨基酸进行了测试,得到了相似的结果。对银粒子演化的时间依赖性表征表明,银枝晶是由经典原子沉积形成的,而另外两种形态是由经典结晶和非经典结晶结合形成的。对合成的银粒子进行了乙烯环氧化反应评价,结果表明银粒子具有较高的选择性。
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来源期刊
KONA Powder and Particle Journal
KONA Powder and Particle Journal 工程技术-材料科学:综合
CiteScore
8.40
自引率
4.90%
发文量
35
审稿时长
>12 weeks
期刊介绍: KONA publishes papers in the broad field of powder science and technology, ranging from fundamental principles to practical applications. Papers describing technological experience and critical reviews of existing knowledge in special areas are also welcome.
期刊最新文献
Editor’s Preface The 54th Symposium on Powder Technology and Special Lecture for the 30th Anniversary of the Establishment of HPTF The KONA Award 2021 General Information Effects of DEM Parameters and Operating Conditions on Particle Dynamics in a Laboratory Scale Rotating Disc
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