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首页> 外文期刊>RSC Advances >Continuous flow synthesis of citrate capped gold nanoparticles using UV induced nucleation
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Continuous flow synthesis of citrate capped gold nanoparticles using UV induced nucleation

机译：紫外诱导成核法连续流合成柠檬酸盐包覆的金纳米颗粒

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摘要

A new approach for synthesising gold nanoparticles of controlled size in the presence of trisodium citrate is presented. UV light is employed as a photoinitiator for the reduction of Au(III) by citrate. The UV induced nucleation takes place in a glass capillary tube (0.8 mm internal diameter) illuminated by a series of germicidal UVC lamps. This has been coupled sequentially with a heated coil to accelerate growth. In this way the processes of nucleation and growth are effectively separated. Slug flow is utilised in order to avoid tube fouling using heptane as segmenting fluid. Increasing UV intensity and temperature of the growth section lead to decrease of nanoparticle size, whilst varying UV exposure time results in a nonmonotonic effect on particle size. By varying UV intensity from 0 to 1461 mW cm?2 at a contant exposure time of 10 s, and a constant growth time of 20 min, the nanoparticles obtained range in size from 9.5 ± 1.3 nm to 36.1 ± 6.9 nm at a low growth temperature of 60 °C, and 6.6 ± 0.8 nm to 14.2 ± 6.4 nm at a high growth temperature of 100 °C.
机译：提出了一种在柠檬酸三钠存在下合成尺寸可控的金纳米颗粒的新方法。紫外光用作光引发剂，用于柠檬酸盐还原Au（ III ）。紫外线诱导的成核作用在玻璃毛细管（内径为0.8毫米）中进行，该毛细管被一系列杀菌UVC灯照射。依次将其与加热的线圈相结合以加速生长。以这种方式，成核和生长的过程被有效地分离了。利用团状流动以避免使用庚烷作为分段流体的管结垢。 UV强度和生长区温度的增加导致纳米颗粒尺寸的减小，而变化的UV暴露时间导致对颗粒尺寸的非单调影响。通过在10 s的持续暴露时间和20 min的恒定生长时间下将紫外线强度从0更改为1461 mW cm ？2 ，获得的纳米颗粒的尺寸范围在60°C的低生长温度下为9.5±1.3 nm至36.1±6.9 nm，在100°C的高生长温度下为6.6±0.8 nm至14.2±6.4 nm。

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