Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 48 for “"multilayer films"”.
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Static and dynamic properties of magnetic Skyrmions in engineered multilayer films
… and characterized the [Pt/CoFeB/MgO]₁₅ multilayers with an extremely low density of pinning centers, which enable not only a fully reproducible skyrmion motion but also a clean study of the skyrmion nucleation process. By using X-ray microscopy, I performed the imaging of various …
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Fundamental studies of polyelectrolyte multilayer films : optical, mechanical, and lithographic property control
Polyelectrolyte multilayers (PEMs) are a versatile type of thin film that is created via layer-by-layer assembly of positively and negatively charged polymers from aqueous solutions. Precise control of the PEM thickness, chemical functionality, and molecular architecture is made possible by …
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Light-triggered release of bioactive compounds from HA/PLL multilayer films for stimulation of cells
… (LbL) technology for the fabrication of polymer multilayer films is widely implemented as a powerful tool to assemble tailor-made materials for controlled drug delivery. The LbL films can as well be engineered to act as mimics of the natural cellular microenvironment. Thus, due to the myriad …
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Indentation Behavior of Multilayer Al/SiC Thin Films
… Youngs modulus, of bulk and thin film materials. Multilayer thin films are an important subset of materials in which alternating layers of two or more materials are deposited on a substrate. Fabrication of multilayer films can result in imperfect layer geometry, particularly the flatness and …
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STRUCTURE-PROPERTY RELATIONSHIPS OF BLOCK COPOLYMERS CONFINED VIA FORCED ASSEMBLY CO-EXTRUSION FOR ENHANCED PHYSICAL PROPERTIES
… of elastomeric block copolymers confined via multilayer co-extrusion technology. In this work, we utilized both self-assembly and forced assembly to achieve hierarchical design within films for mechanical enhancement. When block copolymers are forced to self-assemble in restricted geometries, …
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Toward a drug delivery coating for intraocular lenses
… postoperative therapy. Hydrolytically degradable multilayer films were used to create a multi-drug delivery coating for intraocular lenses (IOL). The establishment of a drug delivery coating for intraocular lenses required key advances in ultrathin film technology. This thesis focused on rational …
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Study of the effect of mechanical stiffness substrata, assembled with polyelectrolyte multilayer thin films, on biofilm forming staphylococcus epidermidis' initial adhesion mechanism
Polyelectrolyte multilayer thin films are polymer films assembled through a layer-by-layer sequential addition of oppositely charged polymers. The layer-by-layer film assembly technique allows for properties such as film thickness, chemical functionality, and elastic moduli to be easily altered by …
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Numerical simulations of the effects of microstructure on photonic crystals
… to electromagnetic waves. In particular, multilayer films and two-dimensional systems were studied. It is known that multilayer films present omnidirectional reflectivity for a certain range of frequencies. A numerical technique for solving the Maxwell's equations within infinite periodic …
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Mechanistic Study of DNA Delivery from Self-Assembled Nanolayered Films
… potential for DNA delivery via layer-by-layer films has been reported, details in the mechanism or factors influencing the success of delivery have not been explored. In this thesis, we designed LbL-assembled DNA multilayer films for localized gene delivery. We present a mechanistic …
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The impact of multilayer periodicity on texture, morphology, chemical stability and machining performance of titanium aluminum nitride/chromium nitride thin films
<p>Multilayer thin films of TiAlN/CrN were deposited at varying bilayer periods (lambda = 2, 4, 8 and 16 nm), along with a co-deposited (TiAlCr)N film and constituent TiAlN and CrN films, on both [111] silicon substrates and WC-4wt% Co inserts with an ISO SPGN 120308 geometry. The effects of …
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Controlled release films and functional surfaces targeting infection, inflammation, and bleeding
… degradable layer-by-layer (LbL) assembled multilayer films as local delivery coatings to address infection, inflammation, and bleeding. These films were engineered to deliver potent antibiotics such as vancomycin and exploratory drugs such as antimicrobial peptides, which prevent the …
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THE STUDY OF PERPENDICULARLY MAGNETIZED COFE/PD MULTILAYERS FOR DOMAIN WALL MOTION
We focus the studies of DW motion in a CoFe/Pd multilayer-based nanowire with strong PMA. We find that high PMA, low saturation magnetization, narrow DW width and high spin polarization can induce low threshold current density for DW motion in CoFe/Pd superlattice-like multilayer films. Next, we …
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Electrostatic Self-Assembly of Biocompatible Thin Films
… be applied in the fabrication of well-organized multilayer thin films possessing various biocompatible properties. ESA multilayer assemblies incorporating various biomaterials including metal oxides and polymers were fabricated, the uniformity, thickness, layer-by-layer linearity, and surface …
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Preparation and characterization of Mo/Al layered thin films
The fabrication of bilayer and multilayer Mo/Al thin films using a conventional multi-target rf-diode sputter deposition system was studied. The films were deposited on glass and Si( 100) substrates. The as-deposited films were characterized with respect to their structure and composition profiles …
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Ultra low thermal conductivity in layered disordered crystalline materials
… thermal conductivity in a dense solid. Thin films of disordered layered crystalline materials were deposited using Modulated Elemental Reactants (MER) method. Cross-plane thermal conductivity was measured using Time-Domain Thermo Reflectance (TDTR) method; elastic properties were investigated …
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Fundamental studies of pH-sensitivity in polyelectrolyte multilayers
… (PAH) from two perspectives of the assembled multilayers - functional group composition and layer growth. In the first part of this thesis, with respect to the composition control of the functional groups, the assembly conditions to create surfaces that were dominated by specific functional …
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CONFINED LAYERED POLYMERIC SYSTEMS FOR PACKAGING ANDCAPACITOR APPLICATIONS
… and nanolayer coextrusion is used to produce films with thousands of layers containing two or more alternating polymers. This dissertation focuses on the structure-property relationships in layered polymeric systems for applications including confined crystallization for high gas barrier …
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Thermodynamic and Kinetic Studies of (iii-V)(1-X)(iv(2))(x) Semiconducting Thin Films
… (GaAs)$\sb{\rm 1-x}$(Sn$\sb2$)$\sb{\rm x}$ films were grown by Rf-sputter deposition with x up to 0.06 for V$\sb{\rm s}$ (substrate bias) = 75 V, and up to 0.17 for V$\sb{\rm s}$ = 225 V. The reaction path of metastable (GaAs)$\sb{\rm 1-x}$(Sn$\sb2$)$\sb{\rm x}$ alloys followed the sequence: …
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Direct Force Measurements on the Colloidal Scale: From Modified Electrodes to Particle Manipulation
… surface forces and mechanical properties of thin films have been studied by the colloidal probe technique. One central point is the combination of direct force measurements with an electrochemical setup in order to tune interfacial properties of an electrode modified with an organic layer. In …
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