Pulsed Laser System for Nanoparticle Production and Processing

用于纳米颗粒生产和加工的脉冲激光系统

• 批准号: 503865051
• 金额: --
• 依托单位: Bergische Universität Wuppertal
• 依托单位国家: 德国
• 项目类别: Major Research Instrumentation
• 财政年份: 2022
• 资助国家: 德国
• 起止时间: 2021-12-31 至 无数据
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/503865051?language=en
• 关键词: Pulsed; Laser; System; Nanoparticle; Production

The methods of pulsed laser ablation in liquids and pulsed laser fragmentation in liquids enable the production and processing of colloidal nanoparticles under high-purity conditions. Due to the inherent high specific surface area of nanoparticles, surface purity is of great importance for the discrimination of surface functionality from surface adsorbate effects. The high surface purity is one of the great strengths of nanoparticle production by pulsed laser systems, which is why these laser-based methods have increasingly become the focus of research in recent years. While pulsed laser ablation in liquids has been applied to a broad range of materials. Investigation of pulsed laser fragmentation has been carried out mainly on model metal materials such as gold nanoparticles under resonant excitation of the surface plasmons (i.e., laser pulses in the visible wavelength). Further studies on oxide nanoparticles employed for additive manufacturing or tribology are severely limited in throughput and particle size due to the low absorption of VIS/IR laser pulses employed in existing high-power lasers. UV- laser pulses, in contrast, show a much larger absorption cross-section (especially for semiconductors, oxides, and most metal nanoparticles). Consequently, by using UV-lasers, a much more efficient and material-variant research of laser ablation and fragmentation is possible. With the existing IR-lasers in our group, fragmentation of, e.g., oxides (e.g., Y2O3, ZrO2), high melting hard materials (e.g., ZrB2, TiB2, TiC) or high entropy alloys (e.g., Cantor-Alloy) is only possible in insufficient quantity frameworks. The significant increase in throughput has considerable research potential due to the application perspective and the quantity requirement for functional testing (e.g., in additive manufacturing). The laser-produced and processed materials are applied in several research projects of the applicant, including coordinated programs. The proposed high-power UV laser system thus occupies a key position that exerts a leverage effect on the research spectrum at the newly appointed Chair of Materials Science and Additive Manufacturing. Meanwhile, it will strengthen the profile core “Materials.Inspire.Systems” of the University of Wuppertal. The specifications of this major instrumentation are defined based on materials and necessary throughputs relevant to basic and applied research projects. These require high-purity colloidal nanoparticles partly on a scale of 100 g. Accordingly, a whole series of ongoing projects at the Chair will benefit from the new instrument. In addition, further project approaches in the field of laser powder bed fusion (several kg of nanoadditivated micropowder per batch) will become feasible. The continuously operated high-performance UV laser production and processing technology for dispersions that can be implemented with the proposed equipment will represent a distinguishing feature internationally.

液体中的脉冲激光烧蚀和液体中的脉冲激光破碎的方法使得能够在高纯度条件下生产和加工胶体纳米颗粒。由于纳米颗粒固有的高比表面积，表面纯度对于区分表面功能性和表面吸附物效应非常重要。高表面纯度是脉冲激光系统生产纳米颗粒的最大优势之一，这就是为什么这些基于激光的方法近年来越来越成为研究的焦点。而液体中的脉冲激光烧蚀已经应用于广泛的材料。脉冲激光碎裂的研究主要是在表面等离子体激元（即，可见波长的激光脉冲）。由于现有高功率激光器中采用的维斯/IR激光脉冲的低吸收，对用于增材制造或摩擦学的氧化物纳米颗粒的进一步研究在产量和粒度方面受到严重限制。相比之下，紫外激光脉冲显示出更大的吸收截面（特别是对于半导体，氧化物和大多数金属纳米颗粒）。因此，通过使用紫外激光器，激光烧蚀和碎裂的更有效和材料变化的研究是可能的。利用我们小组现有的红外激光器，氧化物（例如，Y2O3，ZrO2），高熔点硬质材料（例如，ZrB 2、TiB 2、TiC）或高熵合金（例如，Cantor-Alloy）仅在数量不足的框架中才有可能。由于应用前景和功能测试的数量要求，吞吐量的显著增加具有相当大的研究潜力（例如，在增材制造中）。激光生产和加工的材料应用于申请人的多个研究项目，包括协调计划。因此，拟议的高功率紫外激光系统占据了关键地位，对新任命的材料科学和增材制造主席的研究光谱产生了杠杆效应。同时，它将加强乌珀塔尔大学的核心"材料.材料.系统"。这一主要仪器的规格是根据与基础和应用研究项目相关的材料和必要的吞吐量确定的。这些需要部分在100 g规模上的高纯度胶体纳米颗粒。因此，主席正在进行的一系列项目将受益于新工具。此外，激光粉末床熔融领域的进一步项目方法（每批几公斤纳米添加剂微粉）将变得可行。可使用拟议设备实施的连续运行的高性能紫外激光生产和分散体加工技术将在国际上代表一个显着的特点。