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Adventurous Research in Chemistry / Synthesis and Characterisation of Novel Nanomaterials

化学创新研究/新型纳米材料的合成和表征

基本信息

批准号：
EP/D051452/1
负责人：
Andrew Michael Ellis
金额：
$ 6.57万
依托单位：
University of Leicester
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2006
资助国家：
英国
起止时间：
2006 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=EP%2FD051452%2F1
关键词：
Adventurous Research Chemistry Synthesis Characterisation

项目摘要

The aim is to explore an entirely novel route for producing unique varieties of nanoparticles. The premise stems from experiments already underway in the Chemistry Department in which weak interactions between molecules are being explored by encasing them in superfluid liquid helium nanodroplets (LHNDs). These droplets are characterised by an ultra-low equilibrium temperature (0.38 K) but their superfludity means that species encountering the droplets in the gas phase will stick to the droplet surface, will then move towards the centre of the droplet, and will coagulate, all within a rapid (<1 ms) timescale. Although currently the tool of chemical physicists, this technology has the potential for applications in chemistry and materials science. The sequential or simultaneous addition of dopants in the gas phase will allow the synthesis of unique nanoscale objects composed of cores and layers of almost infinite choice. Furthermore, the surrounding liquid helium is ideal for soft-landing these nanoparticles intact on substrates, since the weakly bound helium atoms will dissipate virtually all of the collision energy by evaporative loss on impact.The growth of multi-layer nanoparticles will be explored using various types of helium nanodroplets, ranging from relatively small ones (tens of thousands of helium atoms) through to extremely large ones (>>108 atoms). The long-term aim is to show that a stable source of monodisperse helium droplets can be grown by expanding liquid helium through a pinhole nozzle into a vacuum chamber. This unique source should provide a new type of ultra-low temperature reactor for growing large and, to some extent, size-selected nanoparticles and depositing these species on solid targets. High resolution microscopy will be employed to characterise the species formed. Exotic and entirely novel nanoparticles, such as ones with fluid cores (gas or liquid) encapsulated within solid shells, can potentially be produced by this route and the feasibility of this growth process will form part of the planned project.

其目的是探索一种全新的路线来生产独特的纳米颗粒。这个前提源于化学系已经在进行的实验，在这些实验中，分子之间的弱相互作用正在通过将它们包裹在超流液氦纳米滴（LHND）中来探索。这些液滴的特征在于超低平衡温度（0.38 K），但它们的过剩性意味着在气相中遇到液滴的物质将粘附到液滴表面，然后将朝向液滴的中心移动，并且将凝结，所有这些都在快速（<1 ms）的时间尺度内。虽然目前是化学物理学家的工具，但这项技术在化学和材料科学中具有应用潜力。在气相中顺序或同时添加掺杂剂将允许合成由几乎无限选择的核和层组成的独特的纳米级物体。此外，周围的液氦是理想的软着陆这些纳米粒子在基板上完好无损，因为弱结合的氦原子将消散几乎所有的碰撞能量的蒸发损失的影响。多层纳米粒子的生长将探索使用各种类型的氦纳米液滴，范围从相对小的（数万个氦原子）到非常大的（>> 108个原子）。长期的目标是表明，单分散氦滴的稳定来源，可以通过扩大液氦通过针孔喷嘴进入真空室。这种独特的来源应该提供一种新型的超低温反应器，用于生长大的，在某种程度上，尺寸选择的纳米颗粒，并将这些物质沉积在固体靶上。将采用高分辨率显微镜检查形成的物质。奇特的和全新的纳米粒子，例如具有流体核心（气体或液体）封装在固体壳中的纳米粒子，可以通过这种途径生产，这种生长过程的可行性将成为计划项目的一部分。