Melting point of dried gold nanoparticles prepared with ultrasonic spray pyrolysis and lyophilisation

IF 6.1 3区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Ž. Jelen, Marcin Krajewski, F. Zupanič, P. Majerič, Tilen Švarc, I. Anžel, J. Ekar, S. Liou, J. Kubacki, M. Tokarczyk, Rebeka Rudolf
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Abstract

Abstract A coupled process of ultrasonic spray pyrolysis and lyophilisation was used for the synthesis of dried gold nanoparticles. Two methods were applied for determining their melting temperature: uniaxial microcompression and differential scanning calorimetry (DSC) analysis. Uniaxial microcompression resulted in sintering of the dried gold nanoparticles at room temperature with an activation energy of 26–32.5 J/g, which made it impossible to evaluate their melting point. Using DSC, the melting point of the dried gold nanoparticles was measured to be around 1064.3°C, which is close to pure gold. The reason for the absence of a melting point depression in dried gold nanoparticles was their exothermic sintering between 712 and 908.1°C. Graphical abstract
超声喷雾热解和冻干制备的金纳米颗粒的熔点
摘要采用超声喷雾热解和冷冻干燥相结合的工艺合成了干燥的金纳米粒子。采用两种方法测定它们的熔融温度:单轴微压缩法和差示扫描量热法(DSC)分析。单轴微压缩导致干燥的金纳米颗粒在室温下烧结,活化能为26–32.5 J/g,这使得无法评估它们的熔点。使用DSC,测得干燥的金纳米颗粒的熔点约为1064.3°C,接近纯金。干燥的金纳米颗粒中没有熔点降低的原因是它们在712和908.1°C之间的放热烧结。图形摘要
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来源期刊
Nanotechnology Reviews
Nanotechnology Reviews CHEMISTRY, MULTIDISCIPLINARY-NANOSCIENCE & NANOTECHNOLOGY
CiteScore
11.40
自引率
13.50%
发文量
137
审稿时长
7 weeks
期刊介绍: The bimonthly journal Nanotechnology Reviews provides a platform for scientists and engineers of all involved disciplines to exchange important recent research on fundamental as well as applied aspects. While expert reviews provide a state of the art assessment on a specific topic, research highlight contributions present most recent and novel findings. In addition to technical contributions, Nanotechnology Reviews publishes articles on implications of nanotechnology for society, environment, education, intellectual property, industry, and politics.
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