Synthesis and mechanical performance characterization of nanocomposite scrolls closely mimicking sponge spicules

紧密模仿海绵骨针的纳米复合材料涡旋的合成和机械性能表征

• 批准号: 252091510
• 负责人: Dr. Zaklina Burghard
• 金额: --
• 依托单位: Abteilung Chemische Materialsynthese
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2014
• 资助国家: 德国
• 起止时间: 2013-12-31 至 2023-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/252091510?language=en
• 关键词: Synthesis; mechanical; performance; characterization; nanocomposite

In the second period of this project, the previously established scroll fabrication approach shall be further developed to yield scrolls whose dense interior, comprising intimately connected lamellas and a filled central core, closely mimics the architecture of natural (sponge) spicules. On this basis, the full potential of biomimetics shall be exploited to achieve maximum mechanical performance of the scrolls, effectively combining mechanical flexibility with high strength and toughness. Filling of the free space within scrolls obtained by manual scrolling on a substrate or a self-scrolling process shall be accomplished through low temperature chemical bath deposition of titania nanoparticles. Best mechanical properties shall be achieved via suitable adjustment of the number and thickness ratio of the constituent layers, the inner scroll diameter, the crystallinity and density of the titania particles, as well as the water content adjusted by post-synthesis annealing. Moreover, in order to further approach natural spicules, it is planned to incorporate cellulose nanofiber, whose soft mechanical character is expected to promote mechanical flexibility, and whose tailored surface charge density and length renders them into close-to-ideal nucleation sites for the titania nanoparticles. Combined with a detailed analysis of the micro-/nanoscale structure of the artificial spicules, the major mechanisms of mechanical performance will be identified and contrasted with those operative in their natural counterparts. As another objective to be pursued in parallel, two different types of scroll-based actuators shall be explored in detail. The actuators shall operate based upon changes of humidity of the environment and controlled electrostatic charging, respectively. A major goal is to determine the actuator performance, including their operational life time, as a function of the most relevant parameters, including the number and connectivity of lamellas, the inner diameter and width of the scrolls, as well as the amount of implemented cellulose nanofibers.

在本项目的第二阶段，应进一步开发先前建立的卷轴制造方法，以产生其致密内部的卷轴，包括紧密连接的薄片和填充的中央核心，紧密模仿天然（海绵）针状体的结构。在此基础上，充分发挥仿生学的潜力，实现涡旋的最大机械性能，将机械柔性与高强度和韧性有效结合。通过在基底上手动滚动或自滚动过程获得的卷轴内的自由空间的填充应通过二氧化钛纳米颗粒的低温化学浴沉积来完成。通过适当调整组成层的数量和厚度比、内卷直径、二氧化钛颗粒的结晶度和密度以及通过合成后退火调整的水含量，应实现最佳的机械性能。此外，为了进一步接近天然针状体，计划掺入纤维素纤维，其柔软的机械特性预计将促进机械柔性，并且其定制的表面电荷密度和长度使其成为二氧化钛纳米颗粒的接近理想的成核位点。结合人工针状体的微/纳米结构的详细分析，将确定机械性能的主要机制，并与天然对应物中的操作机制进行对比。作为并行追求的另一个目标，应详细探讨两种不同类型的基于涡旋的致动器。致动器应分别根据环境湿度和受控静电充电的变化进行操作。一个主要的目标是确定致动器的性能，包括它们的工作寿命，作为最相关的参数的函数，包括薄片的数量和连接性，卷轴的内径和宽度，以及实施的纤维素纳米纤维的量。