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Showing 1 to 20 of 67 for “"Dewetting"”.
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Dewetting of thin solid films
… devoted to the mathematical study of solid state dewetting and deals with various mathematical topics such as phase field modeling, the derivation of corresponding sharp interface limits, existence of solutions, numerical simulations and linear stability analysis of the dewetting front. We start …
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Templated dewetting of thin solid films
The dewetting of solid metal polycrystalline films to form metal nanoparticles occurs by the nucleation and growth of holes in the film. For typical films on flat substrates, this process is not well-controlled and results in nanoparticles with nonuniform spatial and size distributions. Topographic …
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Solid State Dewetting-Mediated Aggregation of Particles
Structure assembly on surfaces is a field of intense research because of its potential for building devices and device arrays at the nanoscale. An important issue for such assembly is the interaction between the structure material and the surface, since these interactions impose severe restrictions …
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Hydrophobic nanostructured glass surfaces using metal dewetting process
… mask is the result of a solid state thermal dewetting process which is controlled by varying the temperature and time of the process. Using this fabrication process, contact angles up to 137 degrees was achieved. Further surface modification resulted in contact angles exceeding 150 degrees. …
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Effects of Crystalline Anisotropy on Solid-state Dewetting
Solid-state dewetting is the process by which micro– and nano–scale films, wires, and other fabricated structures on a substrate evolve toward geometries which reduce the overall surface free energy of the system. This process, also sometimes referred to as agglomeration, occurs at elevated …
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Dynamic wetting/dewetting processes in complex liquid-solid systems
In this thesis, the phenomenon of a microdrop impacting onto and spreading over surfaces of constant and variable wettability is investigated. The study is motivated by wide-ranging industrial applications of ink-jet printing technologies, in particular used by our industrial sponsor Kodak Ltd. …
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Dewetting and Stress Evolution in Thin Films During Ion Irradiation
… can dewet as if they are melted. The ion induced dewetting process can result into patterned nanoscale structures by self-organization. This project also investigates the stress evolution in thin films when they're bombarded with ∼1keV ions. Processes such as vacancy creation and phase …
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Templated Solid-State Dewetting of Single Crystal Ni Thin Films
… in the as-deposited state and will undergo dewetting if they are heated. Dewetting can occur at temperatures well below the film’s melting temperature so that the film remains in the solid-state. Solid-state dewetting of thin films is driven by surface energy minimization and proceeds …
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Infululence of Polymer Nanoparticles on the Dewetting of Polymer Thin Films
… of polystyrene star based nanoparticles on the dewetting of spun-cast linear polystyrene (PS) films on Si/SiOx surfaces is investigated as a function of temperature, concentration and type of the nanoparticles. The star polymers have polystyrene-benzocyclobutene copolymer arms which can undergo …
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Anisotropic dewetting in ultra-thin single-crystal silicon-on-insulator films
… system for the study of anisotropic thin film dewetting as well as a technologically important system for the development of the next generation of MOSFET devices. The scientific community has misinterpreted the mechanism behind SOI dewetting, attributing it to a stress-driven instability. In …
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Solid-state dewetting of continuous and patterned single crystal Ni thin films
Solid-state dewetting of thin films is a process through which continuous solid films agglomerate to form islands. This process is driven by capillary forces, often occurring via surface self-diffusion. Solid-state dewetting of single crystal films has the potential to produce a wide range of …
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Analysis of potential applications for the templated dewetting of metal thin films
… This solid-state process, known as thin film dewetting, can be initiated by grooving at grain boundaries or triple junctions. Dewetting of thin films on topographically modified substrates has many interesting characteristics. It is a novel self-assembly process for the formation of …
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Study of phenomenologies during templated solid-state dewetting of thin single crystal films
… islands given sufficient atomic mobility. This dewetting process can occur in the solid state, well below the films' melting temperature. Dewetting initiates from film-substrate- vapor three-phase boundaries, which can form naturally via natural hole formation in the continuous film or be …
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Quantitative analysis of anisotropic edge retraction during solid-state dewetting of thin single crystal films
… when sufficient atomic motion is allowed. Dewetting can occur well below the films' melting temperature in the solid-state. The dewetting process begins by formation and motion of film-substrate-vapor three-phase boundaries. These film edges retract via capillarity-driven mass transport. In …
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Micromechanics Approach to the Study of Constitutive Response and Fracture of Solid Propellant Materials
To understand the mechanics of dewetting by accounting for the viscous nature of the material, the micromechanics of dewetting in solid propellant materials is analyzed at a unit cell containing a single particle imbedded in a linearly viscoelastic matrix. For weakly bonded particle/matrix …
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Nonlithographic manufacturing of 1-D silicon nanostructures with tunable surface morphology via thermal dewetting and metal-assisted chemical etching
… begins with silver (Ag) thin-film thermal dewetting, gold (Au) deposition and lift-off to generate a large-scale Au mesh on Si substrates. Followed by metal-assisted chemical etching (MacEtch), where the Au mesh serves as catalyst, arrays of smooth Si nanowires with tunable taper are …
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Stability and Morphological Evolution in Polymer/Nanoparticle Bilayers and Blends Confined to Thin Film Geometries
… coatings to novel drug delivery systems. Dewetting or spontaneous hole formation in amorphous polymer films and phase separation in multicomponent polymer films can hinder the stability of these systems at elevated temperatures. Hence, fundamental understanding of dewetting and phase …
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Ion Irradiation Induced Roughening and Smoothing of Metal Films on Dielectric Substrates
… are explained using a novel irradiation induced dewetting mechanism involving local melting and viscous flow. The temperature-independent dewetting process scales with energy deposition density (J/cm2). Fissures in the initial films are identified as nuclei of dry patches for the dewetting …
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