Magnetostrictive-Piezoelectric Nanocomposites with Unusual Magnetoelectric Properties

具有不寻常磁电特性的磁致伸缩压电纳米复合材料

• 批准号: 0706100
• 负责人: Jiangyu Li
• 金额: --
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-06-15 至 2011-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0706100&HistoricalAwards=false
• 关键词: Magnetostrictive; Piezoelectric; Nanocomposites; Unusual; Magnetoelectric

TECHNICAL: Multiferroic materials possess two or more types of orders simultaneouslythat couple the electric and magnetic fields, yet the magnetoelectric (ME) coupling coefficients in single phase multiferroics are extremely small, making their practical applications virtually impossible. Large efforts have been devoted to developing multiferroic composites consisting of magnetostrictive and piezoelectric phases, which could possess much larger ME coefficients than single-phase materials, yet the difficulty in controlling the microstructures of the composites severely limited their development. In this project PI will develop magnetostrictive-piezoelectric nanocomposites (MPNC) using novel nanolithography based approaches, which allows one to engineer the size, morphology, and distribution of nanoscale fillers precisely in a magnetostrictive or piezoelectric matrix. Such nanostructure engineering will enable PI to design and optimize MPNC with unusual material symmetries and dramatically enhanced ME coupling. The three research goals are to: (1) Develop novel nanocomposite processing techniques using nanoimprint lithography (NIL) and soft lithography (SL) to precisely control the size, morphology, and distributions of second-phase nanofillers in a magnetostrictive or piezoelectric matrix; the matrix will be patterned using NIL or SL, which is then used as a template to deposit second-phase fillers with designed size, morphology, and distribution; three-dimensional nanostructured composites will be processed using these techniques, focusing on materials based on TbDyFe alloys, PVDF polymers, and PZT ceramics; (2) Process MPNC with optimally designed fillers size, morphology, and distribution for unusual material symmetries and dramatically enhanced ME properties, guided by PI's theoretical modeling and simulations using energy minimization approach and homogenization theory; and (3) Characterize the microstructural phenomena and ME properties of MPNC at multiple length scales, and validate theoretical modeling and simulations. NON-TECHNICAL: The education and outreach activities are tightly integrated into research, including training graduate student in an integrated research and educational program; training undergraduate student each year through Undergraduate Research Program at University of Washington; and design a set of simple experiments underlying nanoimprinting for K-12 teachers and students to convey the key concepts of nanotechnology. Nanolithography-enabled composite processing could lead to nanostructure-designed devices and systems with optimized functionality. The integrated research, education and outreach program will stimulate scientific interests of K-12 and college students, promote public understanding on nanotechnology, and attract and train next generation of work force in the strategic important field of nanotechnology.

技术：多铁性材料同时具有两种或多种类型的阶数，可耦合电场和磁场，但单相多铁性材料的磁电（ME）耦合系数极小，使其实际应用几乎不可能。人们一直致力于开发由磁致伸缩相和压电相组成的多铁性复合材料，这种复合材料具有比单相材料大得多的ME系数，但复合材料微观结构控制的难度严重限制了其发展。在该项目中，PI 将使用基于纳米光刻的新型方法开发磁致伸缩压电纳米复合材料 (MPNC)，该方法允许人们在磁致伸缩或压电矩阵中精确设计纳米级填料的尺寸、形态和分布。这种纳米结构工程将使 PI 能够设计和优化具有不寻常材料对称性并显着增强 ME 耦合的 MPNC。这三个研究目标是：（1）使用纳米压印光刻（NIL）和软光刻（SL）开发新型纳米复合材料加工技术，以精确控制磁致伸缩或压电基体中第二相纳米填料的尺寸、形态和分布；使用 NIL 或 SL 对基质进行图案化，然后将其用作模板来沉积具有设计尺寸、形态和分布的第二相填料；三维纳米结构复合材料将使用这些技术进行加工，重点是基于 TbDyFe 合金、PVDF 聚合物和 PZT 陶瓷的材料； (2) 在 PI 使用能量最小化方法和均质化理论的理论建模和模拟的指导下，采用优化设计的填料尺寸、形态和分布来处理 MPNC，以获得不寻常的材料对称性并显着增强 ME 性能； (3)表征MPNC在多个长度尺度上的微观结构现象和ME特性，并验证理论建模和模拟。非技术性：教育和推广活动与研究紧密结合，包括在综合研究和教育计划中培训研究生；每年通过华盛顿大学本科生研究计划培养本科生；并为K-12教师和学生设计了一组简单的纳米压印基础实验，以传达纳米技术的关键概念。支持纳米光刻的复合加工可以产生具有优化功能的纳米结构设计的设备和系统。综合研究、教育和推广计划将激发K-12和大学生的科学兴趣，促进公众对纳米技术的了解，并吸引和培训纳米技术战略重要领域的下一代劳动力。