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Janus-type ceramic nanomaterials : = Anisotropic building blocks for the formation of new composites.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Janus-type ceramic nanomaterials :/
Reminder of title:	Anisotropic building blocks for the formation of new composites.
Author:	Starr, Justin Daniel.
Description:	1 online resource (148 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 77-03, Section: B.
Contained By:	Dissertations Abstracts International77-03B.
Subject:	Nanoscience. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3716972click for full text (PQDT)
ISBN:	9781321962673

Janus-type ceramic nanomaterials : = Anisotropic building blocks for the formation of new composites.
Starr, Justin Daniel.

Janus-type ceramic nanomaterials :Anisotropic building blocks for the formation of new composites. - 1 online resource (148 pages)

Source: Dissertations Abstracts International, Volume: 77-03, Section: B.

Thesis (Ph.D.)--University of Florida, 2014.

Includes bibliographical references

Multiferroic composite materials consist of piezoelectric and magnetostrictive materials joined at a shared interface. Magnetoelectric properties depend on strain transfer across this interface. Cracks, pores and delamination at the interface have caused bulk multiferroic materials to display magnetoelectric properties that are orders of magnitude below theoretical predictions, while nanoscale thin films are expensive and slow to produce, and suffer from substrate clamping effects. Nanofibers rectify many of these problems and have an extremely high interface to volume ratio, however currently used morphologies are subject to delamination at the interface and make it difficult to realize surface and bulk properties of constituent materials. This dissertation focuses on the creation of a new nanomorphology that overcomes these difficulties: the Janus morphology, in which a piezoelectric and magnetostrictive phase are arranged longitudinally along the length of a nanofiber. This work details the synthesis and processing, structure, property relationships for fibers in the barium titanate-cobalt ferrite material system. It also demonstrates how this technique can be extended to produce trilayer fibers, multilayer fibers, and Janus particles with appropriate adjustments to the electrospinning conditions. Further, it demonstrates the potential for co-electrospinning dissimilar materials by illustrating proof of concept Janus structures in the lead zirconate titanate-nickel zinc ferrite material system. Materials are characterized in terms of morphology, composition, crystal structure and magnetic and magnetoelectric properties. Scanning electron microscopy and transmission electron microscopy are used to confirm morphology, energy dispersive spectroscopy is used to verify composition, X-ray diffraction illustrates the crystallography of Janus materials, and both superconducting quantum interference devices and vibrating sample magnetometers were used to characterize magnetic and magnetoelectric properties. These Janus structures expand the existing state-of-the-art with regard to composites. Rather than creating composites by placing fibers in a bulk, for example, Janus fibers allow the fiber itself to the be the composite enabling new connectivities and material properties. As a result, this structure has countless opportunities beyond the realm of multiferroics.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9781321962673Subjects--Topical Terms:

587832
Nanoscience.
Subjects--Index Terms:

CeramicsIndex Terms--Genre/Form:

542853
Electronic books.

Janus-type ceramic nanomaterials : = Anisotropic building blocks for the formation of new composites.
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502 $a Thesis (Ph.D.)--University of Florida, 2014.
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520 $a Multiferroic composite materials consist of piezoelectric and magnetostrictive materials joined at a shared interface. Magnetoelectric properties depend on strain transfer across this interface. Cracks, pores and delamination at the interface have caused bulk multiferroic materials to display magnetoelectric properties that are orders of magnitude below theoretical predictions, while nanoscale thin films are expensive and slow to produce, and suffer from substrate clamping effects. Nanofibers rectify many of these problems and have an extremely high interface to volume ratio, however currently used morphologies are subject to delamination at the interface and make it difficult to realize surface and bulk properties of constituent materials. This dissertation focuses on the creation of a new nanomorphology that overcomes these difficulties: the Janus morphology, in which a piezoelectric and magnetostrictive phase are arranged longitudinally along the length of a nanofiber. This work details the synthesis and processing, structure, property relationships for fibers in the barium titanate-cobalt ferrite material system. It also demonstrates how this technique can be extended to produce trilayer fibers, multilayer fibers, and Janus particles with appropriate adjustments to the electrospinning conditions. Further, it demonstrates the potential for co-electrospinning dissimilar materials by illustrating proof of concept Janus structures in the lead zirconate titanate-nickel zinc ferrite material system. Materials are characterized in terms of morphology, composition, crystal structure and magnetic and magnetoelectric properties. Scanning electron microscopy and transmission electron microscopy are used to confirm morphology, energy dispersive spectroscopy is used to verify composition, X-ray diffraction illustrates the crystallography of Janus materials, and both superconducting quantum interference devices and vibrating sample magnetometers were used to characterize magnetic and magnetoelectric properties. These Janus structures expand the existing state-of-the-art with regard to composites. Rather than creating composites by placing fibers in a bulk, for example, Janus fibers allow the fiber itself to the be the composite enabling new connectivities and material properties. As a result, this structure has countless opportunities beyond the realm of multiferroics.
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