Self-Assembly in Multiferroic Nanocomposites

多铁性纳米复合材料中的自组装

• 批准号: 1159048
• 负责人: Zhiqun Lin
• 金额: $ 24万
• 依托单位: Georgia Tech Research Corporation
• 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 2015-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1159048&HistoricalAwards=false
• 关键词: Self; Assembly; Multiferroic; Nanocomposites

Abstract1159048Lin, ZhiqunMultiferroics are multifunctional materials that exhibit both magnetic order and electrical polarization in the same compound. In these materials, the electric polarization can be induced by a magnetic field and conversely, and the magnetization can be induced by an electric field for use in spintronic devices, remote switchable devices, capacitors, sensors, and magnetic data storage. Nanocomposites of polymer/nanoparticle, formed by incorporating nanoparticles into a polymer matrix, have received a great deal of research interest because of the potential performance enhancement relative to either of the non-hybrid constituents. The use of block copolymers (BCPs) as the matrix offers unprecedented opportunities for controlling the spatial and orientational organization of nanoparticles in nanocomposites by constraining the nanoparticles within desired block of copolymer. Crafting novel nanocomposites with hierarchical order based on BCPs with nanoscopic multiferroic particles preferentially segregated into the target BCP domains may offer new opportunities for developing miniaturized multifunctional electromagnetic materials and devices with controlled dielectric permittivity and magnetic permeability as well as large magnetoelectric coupling. This has yet to be explored.The intellectual merit of the proposed research is to understand the self-assembly in BCP/multiferroic nanoparticle nanocomposites that build on the materials-by-design concept and the control of multiferroic properties through engineering the nanometer-scale ordering of nanoparticles in the nanocomposites. Three research objectives will be pursued through the proposed project: (1) Synthesize monodispersed multiferroic nanoparticles intimately and permanently decorated with well-defined ligands at the surface that afford chemical affinity to one block in diblock copolymer (DBCP); (2) Assemble nanostructured composites (i.e., nanocomposites) with hierarchical order based on DBCPs, incorporating multiferroic nanoparticles within the target block of the DBCP; and (3) Evaluate the ferroelectric and ferromagnetic properties and magnetoelectric coupling of nanocomposites in terms of the electromagnetic parameters and spatial arrangement of constituents.The broader impacts of the proposed work include stronger nanoscience education across several levels. Underrepresented female undergraduate students will be recruited to participate in the research project. Summer research for high school teachers in the PI's lab will provide a medium for transferring nanomaterials science knowledge to high school classrooms. Web-based lesson plans on polymeric nanomaterials and nanocrystals will be developed by high-school female interns for 5th-8th graders nationwide. This activity will ultimately expose elementary and middle school students to the nano-world. The significance of employing multiferroic nanomaterials in DBCP nanocomposites is manifested in gaining fundamental knowledge and expertise on the structure-property relationships in these novel nanostructured materials. This new class of materials may promise a wide diversity of applications in advanced spintronics devices, capacitors, actuators, transducers, sensors, among other areas that are anticipated to fill a critical need in civilian applications and national security (i.e., potentially transformative research), thereby transitioning fundamental scientific discoveries into useful technologies that benefit society.

Abstract1159048lin，Zhiqunmultiferroics是多功能材料，在同一化合物中表现出磁性和电化层。在这些材料中，可以通过磁场诱导电动极化，相反，可以通过电场诱导磁化，以用于自旋设备，远程可切换设备，电容器，传感器和磁性数据存储。通过将纳米颗粒掺入聚合物基质中形成的聚合物/纳米颗粒的纳米复合材料，由于相对于任何一种非杂交成分的潜在性能提高，因此获得了很大的研究兴趣。使用块共聚物（BCP）作为矩阵提供了前所未有的机会，可以通过将纳米颗粒限制在所需的共聚物块中，以控制纳米复合材料中纳米颗粒的空间和定向组织。基于BCP的BCP，用纳米多效率颗粒制作新型纳米复合材料，优先将纳米粒子颗粒划分为目标BCP域可能会为开发具有微型的多功能电磁材料和设备提供新的机会，并具有具有控制的介电性和磁性渗透性和磁性渗透性。拟议研究的智力优点是了解BCP/多铁纳米粒子纳米复合材料的自我组装的智力优点，这些纳米复合材料基于逐个设计的材料概念以及通过工程化纳米复合物中纳米粒子的纳米尺度订购的多种过度特性的控制。将通过拟议的项目实现三个研究目标：（1）合成单分散的多效性纳米颗粒，并在表面上以明确的配体永久装饰，在Diblock共聚物（DBCP）中具有化学亲和力，使化学亲和力具有化学亲和力； （2）将基于DBCP的分层顺序组装纳米结构化合物（即纳米复合材料），将多效纳米颗粒掺入DBCP的目标块中； （3）根据电磁参数和成分的空间排列，评估纳米复合材料的铁电和铁磁特性以及磁电耦合。拟议工作的更广泛的影响包括多个层次的纳米科学教育的广泛影响。代表性不足的女性本科生将被招募参加研究项目。 PI实验室中高中教师的夏季研究将提供一种将纳米材料科学知识转移到高中教室的媒介。基于Web的基于网络的纳米材料和纳米晶体的课程计划将由全国5至8年级的高中女性实习生制定。这项活动最终将使小学和中学生接触到纳米世界。在DBCP纳米复合材料中采用多种纳米材料的意义表明，在这些新型纳米结构材料中获得了有关结构 - 特质关系的基本知识和专业知识。这种新的材料可能会在先进的Spintronics设备，电容器，执行器，传感器，传感器等中有多种应用，以及预计有望满足平民应用和国家安全（即潜在的变革性研究）的关键需求的其他领域，从而将基本科学发现转移到有益的社会中的有用科学技术中。