CAREER: Structure-property Relationships Arising From Interfacial Coupling in Bi-phasic Ceramic Nanocomposites

职业：双相陶瓷纳米复合材料中界面耦合产生的结构-性能关系

• 批准号: 1150665
• 负责人: Jennifer Andrew
• 金额: $ 48.82万
• 依托单位: University of Florida
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-07-01 至 2019-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1150665&HistoricalAwards=false
• 关键词: CAREER; Structure; property; Relationships; Arising

NON-TECHNICAL DESCRIPTION: This project focuses on a class of composites referred to as multiferroics, which combine magnetic and electrical insulators, and can enable new electronic applications including multi-phase computer memory, tunable microelectronics, and electromagnetic interference filters. Composite materials are made up of at least two distinct components with differing composition and physical properties. The constituent materials are chosen with properties that do not occur in a single component material, but are desirable in a final product. However, in order for composite materials to have enhanced properties compared with their constituent phases, the interface between the two constituents must be understood. This project is developing new methods to fabricate ceramic composite materials with controlled interfaces. These materials will allow for an entirely new way of correlating the macroscopic composite properties with interfacial properties. The specific education objectives are to employ a team-based approach to 1) introduce and expose graduate and undergraduate students to novel materials research that addresses application based needs, 2) leverage existing outreach experience to encourage and improve high school graduation rates in at-risk youth, and 3) to educate graduate and undergraduate students in a multi-institutional and multi-disciplinary environment through collaborations.TECHNICAL DETAILS: Many material properties are mutually exclusive, and are therefore unlikely to exist in single-phase materials. This property dichotomy includes strength and toughness, high electric permittivity and high magnetic permeability, and soft and hard magnetic properties. However, increasing performance in many real-world applications relies on combining these properties. Currently, most complex oxide composites, or heterostructures, are prepared in thin-film form on substrates. These substrates induce changes in the local symmetry, which alter the properties of the films. The primary goal of this project is to synthesize free-standing composite bi-phasic nanoparticles and fibers to study the effects of interfacial properties, including area and nature (e.g., epitaxy) on composite properties. By fabricating composite materials without the use of substrates the structure-property relationships that arise from coupling in these systems is being established.

非技术描述：该项目的重点是一类称为多表色的复合材料，这些复合材料结合了磁性和电绝缘体，并可以实现新的电子应用，包括多相计算机存储器，可调微电子，以及电磁干扰过滤器。 复合材料由至少两个不同的组成部分组成，具有不同的组成和物理特性。 组成材料是使用单个组件材料中未发生的特性选择的，但在最终产品中是可取的。 但是，为了使复合材料与其组成阶段相比具有增强的性质，必须理解两个成分之间的界面。 该项目正在开发新方法，以制造具有受控界面的陶瓷复合材料。 这些材料将允许将宏观复合特性与界面特性相关联的全新方法。 具体的教育目标是采用基于团队的方法1）介绍并将研究生和本科生介绍到满足基于应用的需求的新颖材料研究中，2）利用现有的外展经验来鼓励和提高年轻人的高中毕业率，以及3）3），通过合作和多种材料属性的详细信息，以教育研究生和本科生。单相材料不太可能存在。 该特性二分法包括强度和韧性，高电介电常数以及高磁渗透性以及柔软而硬磁性的特性。 但是，在许多现实世界应用中的性能提高依赖于结合这些属性。 当前，大多数复杂的氧化物复合材料或异质结构是在底物上以薄膜形式制备的。 这些底物诱导局部对称性的变化，从而改变了膜的性质。 该项目的主要目的是合成独立的复合双重纳米颗粒和纤维，以研究界面特性的影响，包括面积和自然（例如外观上）对复合特性的影响。 通过制造复合材料而不使用底物建立由这些系统中的耦合产生的结构 - 托管关系。