Magnetic Nanoparticle Field Directed Self-assembly

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ISBN 13 :
Total Pages : 153 pages
Book Rating : 4.:/5 (128 download)

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Book Synopsis Magnetic Nanoparticle Field Directed Self-assembly by : Ryan Michael Schmidt

Download or read book Magnetic Nanoparticle Field Directed Self-assembly written by Ryan Michael Schmidt and published by . This book was released on 2011 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt: Directed self-assembly of nanomaterials via external fields is an attractive processing tool for industry as it is inherently inexpensive and flexible. The self-assembly of magnetic nanoparticles in particular has gained much recent interest for applications ranging from biomedical imaging and targeted cancer therapy to ferrofluid mechanical damping devices, that rely on the state of aggregation and alignment of the nanoparticles. We utilize an oil-water platform to directly observe directed self-assembly of magnetic nanoparticles that are field ordered into two-dimensional mesostructures through the fossilized liquid assembly method. Our system consisted of polymer-coated iron-oxide nanoparticles which were assembled at the interface between a crosslinkable hydrophobic monomer oil, and water through the use of external magnetic fields, and then cured with UV light. In this study, entire magnetic flux field lines in various geometrical configurations were successfully modeled and mapped out by the magnetic nanoparticles, both in-plane and in perpendicular orientations utilizing FLA. As the microscopic behavior of magnetic nanoparticles is known through this first study, further work can then be conducted through the assembly of block copolymer/magnetic nanoparticle nanocomposites. The morphology of neat self-assembled block copolymers have been extensively studied and it has been proven that the molecular weight, volume fraction of the components, and the degree of segment incompatibility are the three independent parameters used to determine equilibrium morphologies. The assembled orientations of lamellar and cylindrical morphologies in particular develop specific directionalities depending on the natural interactions of the blocks with the substrate and surface. It has been shown that treatments such as UV-Ozone treatment of the substrate, mechanical shear, or electrical fields can force this directionality to be altered, however few methods have been developed to readily alter preferential morphologies through the use of magnetic fields. In order to provide preliminary results toward the validity of a magnetically driven reorientation process, systems of polystyrene-b-poly(methylmethacrylate) with varying molecular weights were loaded with up to 1% polystyrene coated cobalt nanoparticles. This study successfully showed that the particles can be loaded into the block copolymers without disrupting the morphology of the block copolymers, and also provided initial results that this method is plausible.

Magnetic Field-Directed Self-Assembly of Magnetic Nanoparticle Chains in Polymers

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ISBN 13 :
Total Pages : 133 pages
Book Rating : 4.:/5 (897 download)

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Book Synopsis Magnetic Field-Directed Self-Assembly of Magnetic Nanoparticle Chains in Polymers by : Peter John Krommenhoek

Download or read book Magnetic Field-Directed Self-Assembly of Magnetic Nanoparticle Chains in Polymers written by Peter John Krommenhoek and published by . This book was released on 2013 with total page 133 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Magnetic-field-directed Self-assembly of Multifunctional Aerosol Nanoparticles

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Publisher :
ISBN 13 : 9789178956685
Total Pages : pages
Book Rating : 4.9/5 (566 download)

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Book Synopsis Magnetic-field-directed Self-assembly of Multifunctional Aerosol Nanoparticles by :

Download or read book Magnetic-field-directed Self-assembly of Multifunctional Aerosol Nanoparticles written by and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Plasma Synthesis and Self-Assembly of Magnetic Nanoparticles

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Publisher : Linköping University Electronic Press
ISBN 13 : 9176850099
Total Pages : 58 pages
Book Rating : 4.1/5 (768 download)

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Book Synopsis Plasma Synthesis and Self-Assembly of Magnetic Nanoparticles by : Sebastian Ekeroth

Download or read book Plasma Synthesis and Self-Assembly of Magnetic Nanoparticles written by Sebastian Ekeroth and published by Linköping University Electronic Press. This book was released on 2019-11-08 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanomaterials are important tools for enabling technological progress as they can provide dramatically different properties as compared to the bulk counterparts. The field of nanoparticles is one of the most investigated within nanomaterials, thanks to the existing, relatively simple, means of manufacturing. In this thesis, high-power pulsed hollow cathode sputtering is used to nucleate and grow magnetic nanoparticles in a plasma. This sputtering technique provides a high degree of ionization of the sputtered material, which has previously been shown to aid in the growth of the nanoparticles. The magnetic properties of the particles are utilized and makes it possible for the grown particles to act as building blocks for self-assembly into more sophisticated nano structures, particularly when an external magnetic field is applied. These structures created are termed “nanowires” or “nanotrusses”, depending on the level of branching and inter-linking that occurs. Several different elements have been investigated in this thesis. In a novel approach, it is shown how nanoparticles with more advanced structures, and containing material from two hollow cathodes, can be fabricated using high-power pulses. The dual-element particles are achieved by using two distinct and individual elemental cathodes, and a pulse process that allows tuning of individual pulses separately to them. Nanoparticles grown and investigated are Fe, Ni, Pt, Fe-Ni and Ni-Pt. Alternatively, the addition of oxygen to the process allows the formation of oxide or hybrid metal oxide – metal particles. For all nanoparticles containing several elements, it is demonstrated that the stoichiometry can be easily varied, either by the amount of reactive gas let into the process or by tuning the amount of sputtered material through adjusting the electric power supplied to the different cathodes. One aim of the presented work is to find a suitable material for the use as a catalyst in the production of H2 gas through the process of water splitting. H2 is a good candidate to replace fossil fuels as an energy carrier. However, rare elements (such as Ir or Pt) needs to be used as the catalyst, otherwise a high overpotential is required for the splitting to occur, leading to a low efficiency. This work demonstrates a possible route to avoid this, by using nanomaterials to increase the surface-to-volume ratio, as well as optimizing the elemental ratio between different materials to lower the amount of noble elements required.

Spark Ablation

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Publisher : CRC Press
ISBN 13 : 1000730441
Total Pages : 292 pages
Book Rating : 4.0/5 (7 download)

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Book Synopsis Spark Ablation by : Andreas Schmidt-Ott

Download or read book Spark Ablation written by Andreas Schmidt-Ott and published by CRC Press. This book was released on 2019-12-19 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spark ablation has been used worldwide for decades. However, in many fields, the special properties of nanoparticles, which come into play especially for sizes

Microscale Acoustofluidics

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Publisher : Royal Society of Chemistry
ISBN 13 : 1849737061
Total Pages : 593 pages
Book Rating : 4.8/5 (497 download)

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Book Synopsis Microscale Acoustofluidics by : Thomas Laurell

Download or read book Microscale Acoustofluidics written by Thomas Laurell and published by Royal Society of Chemistry. This book was released on 2014-12-08 with total page 593 pages. Available in PDF, EPUB and Kindle. Book excerpt: The manipulation of cells and microparticles within microfluidic systems using external forces is valuable for many microscale analytical and bioanalytical applications. Acoustofluidics is the ultrasound-based external forcing of microparticles with microfluidic systems. It has gained much interest because it allows for the simple label-free separation of microparticles based on their mechanical properties without affecting the microparticles themselves. Microscale Acoustofluidics provides an introduction to the field providing the background to the fundamental physics including chapters on governing equations in microfluidics and perturbation theory and ultrasound resonances, acoustic radiation force on small particles, continuum mechanics for ultrasonic particle manipulation, and piezoelectricity and application to the excitation of acoustic fields for ultrasonic particle manipulation. The book also provides information on the design and characterization of ultrasonic particle manipulation devices as well as applications in acoustic trapping and immunoassays. Written by leading experts in the field, the book will appeal to postgraduate students and researchers interested in microfluidics and lab-on-a-chip applications.

Ising-type Antiferromagnets

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Publisher : Springer Science & Business Media
ISBN 13 : 9783540404286
Total Pages : 138 pages
Book Rating : 4.4/5 (42 download)

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Book Synopsis Ising-type Antiferromagnets by : Christian Binek

Download or read book Ising-type Antiferromagnets written by Christian Binek and published by Springer Science & Business Media. This book was released on 2003-09-22 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt: Selected modern aspects of artificially layered structures and bulk materials involving antiferromagnetic long-range order are the main themes of this book. Special emphasis is laid on the prototypical behavior of Ising-type model systems. They play a crucial role in the field of statistical physics and, in addition, contribute to the basic understanding of the exchange bias phenomenon in MBE-grown magnetic heterosystems. Throughout the book, particular attention is given to the interplay between experimental results and their theoretical description, ranging from the famous Lee-Yang theory of phase transitions to novel mechanisms of exchange bias.

Self-assembly of Nanoparticles Under External Magnetic Field

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Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (129 download)

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Book Synopsis Self-assembly of Nanoparticles Under External Magnetic Field by : Xiaowei Teng

Download or read book Self-assembly of Nanoparticles Under External Magnetic Field written by Xiaowei Teng and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Materials Nanoarchitectonics

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Publisher : Elsevier
ISBN 13 : 0323994733
Total Pages : 648 pages
Book Rating : 4.3/5 (239 download)

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Book Synopsis Materials Nanoarchitectonics by : Katsuhiko Ariga

Download or read book Materials Nanoarchitectonics written by Katsuhiko Ariga and published by Elsevier. This book was released on 2023-12-15 with total page 648 pages. Available in PDF, EPUB and Kindle. Book excerpt: Materials Nanoarchitectonics: From Integrated Molecular Systems to Advanced Devices provides the latest information on the design and molecular manipulation of self-organized hierarchically structured systems using tailor-made nanoscale materials as structural and functional units. The book is organized into three main sections that focus on molecular design of building blocks and hybrid materials, formation of nanostructures, and applications and devices. Bringing together emerging materials, synthetic aspects, nanostructure strategies, and applications, the book aims to support further progress, by offering different perspectives and a strong interdisciplinary approach to this rapidly growing area of innovation. This is an extremely valuable resource for researchers, advanced students, and scientists in industry, with an interest in nanoarchitectonics, nanostructures, and nanomaterials, or across the areas of nanotechnology, chemistry, surface science, polymer science, electrical engineering, physics, chemical engineering, and materials science. Offers a nanoarchitectonic perspective on emerging fields, such as metal-organic frameworks, porous polymer materials, or biomimetic nanostructures Discusses different approaches to utilizing "soft chemistry" as a source for hierarchically organized materials Offers an interdisciplinary approach to the design and construction of integrated chemical nano systems Discusses novel approaches towards the creation of complex multiscale architectures

Computational Study of Self-assembly in Block Copolymer/superparamagnetic Nanoparticle Composites Under External Magnetic Fields

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Publisher :
ISBN 13 :
Total Pages : 147 pages
Book Rating : 4.:/5 (879 download)

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Book Synopsis Computational Study of Self-assembly in Block Copolymer/superparamagnetic Nanoparticle Composites Under External Magnetic Fields by : Vinay Raman

Download or read book Computational Study of Self-assembly in Block Copolymer/superparamagnetic Nanoparticle Composites Under External Magnetic Fields written by Vinay Raman and published by . This book was released on 2014 with total page 147 pages. Available in PDF, EPUB and Kindle. Book excerpt: This computational and theoretical study investigates the self-assembly of superparamagnetic nanoparticles and block copolymers under external magnetic fields. A variety of morphological transitions are observed based on the field orientation, nanoparticle loading, and selectivity of the nanoparticles for the blocks. For symmetric block copolymers, chaining of superparamagnetic nanoparticles under in-plane magnetic fields is shown to achieve long range orientational order of the block copolymer nanodomains and is found to be dependent on nanoparticle size, volume fraction and magnetization strength. A critical selectivity of the particles for one nanodomain is observed, above which strong alignment results and below which comparatively disordered structures are formed. Higher magnetization strengths are found to reduce equilibrium defect densities in the nematic-isotropic ordering of lamellar thin films, as corroborated by scaling arguments. For asymmetric coil fractions forming hexagonal block copolymer nanostructure, the inplane field induced chaining of the nanoparticles selective for the minority block, leads to the formation of stripe phases oriented parallel to the magnetic field. Furthermore, in-plane field induced chaining of nanoparticles selective for the majority block leads to alignment of hexagonal morphology with 100 direction oriented parallel to the external magnetic field. Out of plane magnetic fields induce repulsive dipolar interactions between the nanoparticles that annihilate the defects in the hexagonal morphology of the block copolymer when the nanoparticle is selective for the minority block. Honeycomb lattices are obtained using nanoparticles selective for majority block under out of plane magnetic fields for certain specific nanoparticle loadings. Commensurability of nanoparticle size and loadings with the block copolymer structure is critical in optimizing the ordering of the final composite. Kinetics of alignment in block copolymer nanocomposites is studied using External Potential Dynamics (EPD) method, wherein an equivalent evolution equation for potential fields is solved instead of conservation equation for the monomer segments. The dynamics study reveals an interesting interplay of nanoparticle mobility, dipolar interaction strength and nanoparticle-polymer interaction strength on the rate of alignment of domains.

Self-Assembly of Nanostructures and Patchy Nanoparticles

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Publisher : BoD – Books on Demand
ISBN 13 : 1789239605
Total Pages : 102 pages
Book Rating : 4.7/5 (892 download)

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Book Synopsis Self-Assembly of Nanostructures and Patchy Nanoparticles by : Shafigh Mehraeen

Download or read book Self-Assembly of Nanostructures and Patchy Nanoparticles written by Shafigh Mehraeen and published by BoD – Books on Demand. This book was released on 2020-11-04 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: Top-down approaches are currently the main contributor of fabricating microelectronic devices. However, the prohibitive cost of numerous technological steps in these approaches is the main obstacle to further progress. Furthermore, a large number of applications necessitate fabrication of complex and ultra-small devices that cannot be made using these approaches. New approaches based on natural self-assembly of matter need to be developed to allow for fabrication of micro and nanoelectronic devices. Self-assembly of nanostructures is a dynamic field, which explores physics of these structures and new ways to fabricate them. However, the major problem is how to control the properties of the nanostructures resulting from low dimensionality. This book presents recent advances made to address this problem, and fabricate nanostructures using self-assembly.

Self-assembly of Magnetic Nanoparticles

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Publisher :
ISBN 13 :
Total Pages : 212 pages
Book Rating : 4.:/5 (682 download)

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Book Synopsis Self-assembly of Magnetic Nanoparticles by : JiYeon Ku

Download or read book Self-assembly of Magnetic Nanoparticles written by JiYeon Ku and published by . This book was released on 2009 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Magnetic Nanoparticles

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Publisher : John Wiley & Sons
ISBN 13 : 352762757X
Total Pages : 484 pages
Book Rating : 4.5/5 (276 download)

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Book Synopsis Magnetic Nanoparticles by : Sergey P. Gubin

Download or read book Magnetic Nanoparticles written by Sergey P. Gubin and published by John Wiley & Sons. This book was released on 2009-11-18 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt: This interdisciplinary approach to the topic brings together reviews of the physics, chemistry, fabrication and application of magnetic nanoparticles and nanostructures within a single cover. With its discussion of the basics as well as the most recent developments, and featuring many examples of practical applications, the result is both a clear and concise introduction to the topic for beginners and a guide to relevant comprehensive physical phenomena and essential technological applications for experienced researchers.

Electric Field Directed Self Assembly of Nanoparticle Structures

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Publisher :
ISBN 13 :
Total Pages : 180 pages
Book Rating : 4.:/5 (311 download)

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Book Synopsis Electric Field Directed Self Assembly of Nanoparticle Structures by : Dietrich Alexander Dehlinger

Download or read book Electric Field Directed Self Assembly of Nanoparticle Structures written by Dietrich Alexander Dehlinger and published by . This book was released on 2008 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is traditionally difficult to integrate a wide range of nanocomponents into macroscopic or mesoscopic scale systems. Traditional methods of nanofabrication use large scale patterning of homogenous layers, or make use of the intrinsic properties of the particles in to bind them together in an uncontrolled fashion. In this dissertation, a method for the rapid, highly controlled deposition of water soluble nanoparticles is demonstrated. Through the use of direct current controlled electrodes in a buffered solution, nanoparticles are pulled from a dilute solution to a complementary binding surface in a few seconds where they form a single layer. By repeated processing steps we are able to rapidly fabricate multilayered structures using different nanoparticles, making use of both overall directed assembly and the local self assembly of the particles themselves. Because we are able to control the particle concentration, we can effectively control the particle binding rate at the deposition surface. Described in detail is a method for characterizing the deposition process to determine both the optimal parameters (in terms of deposition time and current) for a given particle type, and methods to determine the level of interparticle self binding. Optical fluorescent imaging and electron microscopy were used extensively to characterize the rate of particle accumulation both as a function of current and time for a single deposition, and for the overall process through subsequent layers. The electric field assisted self assembly work was carried out for 40nm and 200nm biotin/streptavidin coated particles, as well as particles covered in various DNA sequences, quantum dots, and gold particles. Particle deposition profiles across the electrode are also discussed, with the root causes for the observed pattern explained using various electric field deposition from this work, as well as some supporting experiments from tangentially related experiments. These experimental results are compared to various simulated systems. Finally some preliminary work on long range, high voltage, high conductivity dielectrophoresis systems is discussed with an eye towards fully integrated sample analysis systems.

Magnetic Nanoparticles in Biosensing and Medicine

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Publisher : Cambridge University Press
ISBN 13 : 1107031095
Total Pages : 317 pages
Book Rating : 4.1/5 (7 download)

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Book Synopsis Magnetic Nanoparticles in Biosensing and Medicine by : Nicholas J. Darton

Download or read book Magnetic Nanoparticles in Biosensing and Medicine written by Nicholas J. Darton and published by Cambridge University Press. This book was released on 2019-02-14 with total page 317 pages. Available in PDF, EPUB and Kindle. Book excerpt: Drawing together topics from a wide range of disciplines, and featuring up-to-date examples of clinical usage and research applications, this text provides a comprehensive insight into the fundamentals of magnetic biosensors and the applications of magnetic nanoparticles in medicine.

Using Solution Phase Self-assembly to Control the Properties of Magnetic and Magnetoelectric Nanostructures

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Publisher :
ISBN 13 :
Total Pages : 98 pages
Book Rating : 4.:/5 (869 download)

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Book Synopsis Using Solution Phase Self-assembly to Control the Properties of Magnetic and Magnetoelectric Nanostructures by : Laura Theresa Schelhas

Download or read book Using Solution Phase Self-assembly to Control the Properties of Magnetic and Magnetoelectric Nanostructures written by Laura Theresa Schelhas and published by . This book was released on 2013 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanostrutured magnetic materials have gained much recent interest because of their application in various electronic systems. These materials, however, often require complex lithography and epitaxy to control the magnetic properties. In this work, solution-phase self-assembly is used to create magnetic and magnetoelectric materials with a variety of nanoscale structures. By engineering the architecture of the system, control over a range of magnetic properties can be realized. The first part of this work focuses on nano-magnetic materials. Here, the organization of nanoscale magnets into different geometries is controlled, and the properties of the systems are studied. In the first chapter, Ni-Cu nanowire stacks are examined to explore the effect of shape anisotropy on the coupling between different elements. This work provides insight into how to design new elements for spin-torque devices. In the next chapter, directed self-assembly of block copolymers is used to create coupled 1D chains of ferromagnetic and superparamagnetic FePt nanoparticles. These nano-patterned are globally aligned on the wafer length-scale using micron-sized lithographic grooves. This system is ideal for studying dipolar coupling between magnetic nanocrystals. Additionally, the processing methods developed here provide a platform for organizing other types of nanomaterials. The second sections explore magnetoelectric materials. These are materials that combine ferromagnetism and ferroelectricity in a coupled manner. One material that does this intrinsically is bismuth ferrite. The first chapter of this section explores ordered nanoporous bismuth ferrite produced by block copolymer templating. It is shown that the ordered porosity of the system creates a unique strain state in the bismuth ferrite, which in turn produces a large change in magnetization upon application of an electric field. Finally, in the last chapter, a nanostructured composite magnetoelectric system is studied. Here, magnetostrictive Ni nanocrystals are coupled to a single-crystalline piezoelectric substrate. The nanocrystals are superparamagnetic and show no net magnetization. Upon application of an electric field, however, strain induced in the piezoelectric substrate strains the lattice of the nanocrystals, creating a preferred magnetic axis along the high strained direction. This locks the magnetization along the strain axis and switches the nanocrystals from a superparamagnetic to a ferromagnetic state.

Directed Self-assembly of Nanoparticles

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Publisher :
ISBN 13 :
Total Pages : 388 pages
Book Rating : 4.:/5 (628 download)

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Book Synopsis Directed Self-assembly of Nanoparticles by : Benjamin L. Frankamp

Download or read book Directed Self-assembly of Nanoparticles written by Benjamin L. Frankamp and published by . This book was released on 2005 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt: