Spectroscopic Investigation of Electrospun Nanofibers

静电纺纳米纤维的光谱研究

• 批准号: RGPIN-2015-04014
• 负责人: Pellerin, Christian
• 金额: $ 3.28万
• 依托单位: Université de Montréal
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=661848
• 关键词: Spectroscopic; Investigation; Electrospun; Nanofibers

My group studies the structure and properties of soft materials (polymers, supramolecular assemblies and molecular glasses) and develops advanced spectroscopy techniques (such as polarized Raman and time-resolved infrared spectroscopy). Our experience and world-leading infrastructure provide us a unique opportunity to make innovative contributions in the field of electrospinning. *** Electrospinning is an extremely popular method for producing nanofibers thanks to its experimental simplicity and amazing versatility. Electrospun fibers are currently used in selective membranes, tissue engineering and other biomedical applications, but there is a growing interest in applying them for technological applications in sensors, energy conversion, catalysis and opto-electronic devices. Unfortunately, our understanding of the structure and properties of nanofibers, and how they are affected by the electrospinning process, remains fragmentary. Molecular orientation is often invoked as a critical parameter but it is challenging to quantify. My group has recently demonstrated the power of vibrational spectroscopy at the individual fiber scale to do this quantification and answer other important questions in the field.*** In this context, my program seeks to understand and control the structure and properties of electrospun fibers using state-of-the-art vibrational spectroscopy. We will study five key aspects of electrospun fibers, with the specific objectives of: 1) Understanding molecular orientation in fibers and its impact on their properties; 2) Demonstrating and controlling disentanglement of polymer chains during electrospinning; 3) Enabling a deeper understanding of electrospinning through time-resolved infrared studies; 4) Understanding why and where polymorphs form during electrospinning; and 5) Understanding the effect of blending on fiber microstructure. To reach these ambitious objectives, we will use our workhorse Raman technique in combination with IR spectroscopy, including the first nanoIR instrument in Canada, and various complementary techniques.*** Our research is innovative and could not be conducted elsewhere in the world. It should greatly improve the current understanding of the structure in electrospun fibers and their unusual properties when they reach the nanoscale. It will allow confirming and explaining possibly transformative observations, such as partial disentanglement and polymorph formation. Our work will also lead to significant instrumental developments in vibrational spectroscopy that will be applicable to other fields of materials science. Overall, our work will improve our ability to optimize the properties of nanofibers and contribute to making their promising technological applications a reality.**

我的小组研究了软材料（聚合物，超分子组件和分子玻璃）的结构和特性，并开发了晚期光谱技术（例如偏振拉曼和时间分辨的红外光谱）。我们的经验和世界领先的基础设施为我们提供了一个独特的机会，可以在静电纺丝领域做出创新的贡献。 ***静电纺丝是一种非常流行的方法，可用于产生纳米纤维，这是由于其实验性的简单性和惊人的多功能性。电纺纤维目前用于选择性膜，组织工程和其他生物医学应用中，但是将它们应用于传感器，能量转换，催化和光电设备的技术应用越来越兴趣。不幸的是，我们对纳米纤维的结构和特性的理解，以及它们如何受到静电纺丝过程的影响，仍然是零碎的。分子取向通常被称为关键参数，但量化是具有挑战性的。我的小组最近证明了在单个纤维量表上进行此量化并回答现场其他重要问题的振动光谱的力量。我们将研究电纺纤维的五个关键方面，并具有以下特定目标：1）了解纤维中的分子取向及其对其性质的影响； 2）在静电纺丝过程中证明和控制聚合物链的解开； 3）通过时间分辨的红外研究使人们更深入地了解静电纺丝； 4）了解静电纺丝过程中的多晶型物的原因和地点； 5）了解混合对光纤微结构的影响。为了实现这些雄心勃勃的目标，我们将使用我们的主力拉曼技术与红外光谱（包括加拿大的第一个纳米仪器）结合使用，以及各种互补的技术。***我们的研究具有创新性，无法在世界其他地方进行。当电纺纤维到达纳米级时，它应该大大提高对电纺纤维及其异常特性的当前理解。它将允许确认并解释可能的变革性观察，例如部分解脱和多晶型物的形成。我们的工作还将导致振动光谱法的重大工具发展，这将适用于其他材料科学领域。总体而言，我们的工作将提高我们优化纳米纤维特性的能力，并有助于使其有前途的技术应用成为现实。**