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2019


The acoustic hologram and particle manipulation with structured acoustic fields
The acoustic hologram and particle manipulation with structured acoustic fields

Melde, K.

Karlsruher Institut für Technologie (KIT), May 2019 (phdthesis)

Abstract
This thesis presents holograms as a novel approach to create arbitrary ultrasound fields. It is shown how any wavefront can simply be encoded in the thickness profile of a phase plate. Contemporary 3D-printers enable fabrication of structured surfaces with feature sizes corresponding to wavelengths of ultrasound up to 7.5 MHz in water—covering the majority of medical and industrial applications. The whole workflow for designing and creating acoustic holograms has been developed and is presented in this thesis. To reconstruct the encoded fields a single transducer element is sufficient. Arbitrary fields are demonstrated in transmission and reflection configurations in water and air and validated by extensive hydrophone scans. To complement these time-consuming measurements a new approach, based on thermography, is presented, which enables volumetric sound field scans in just a few seconds. Several original experiments demonstrate the advantages of using acoustic holograms for particle manipulation. Most notably, directed parallel assembly of microparticles in the shape of a projected acoustic image has been shown and extended to a fabrication method by fusing the particles in a polymerization reaction. Further, seemingly dynamic propulsion from a static hologram is demonstrated by controlling the phase gradient along a projected track. The necessary complexity to create ultrasound fields with set amplitude and phase distributions is easily managed using acoustic holograms. The acoustic hologram is a simple and cost-effective tool for shaping ultrasound fields with high-fidelity. It is expected to have an impact in many applications where ultrasound is employed.

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link (url) DOI [BibTex]

2019



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Ferromagnetic colloids in liquid crystal solvents

Zarubin, G.

Universität Stuttgart, Stuttgart, 2019 (phdthesis)

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link (url) DOI [BibTex]

link (url) DOI [BibTex]


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Fluctuating interface with a pinning potential

Pranjić, Daniel

Universität Stuttgart, Stuttgart, 2019 (mastersthesis)

icm

[BibTex]

[BibTex]


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Controlling pattern formation in the confined Schnakenberg model

Beyer, David Bernhard

Universität Stuttgart, Stuttgart, 2019 (mastersthesis)

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[BibTex]

[BibTex]


Dynamics of self-propelled colloids and their application as active matter
Dynamics of self-propelled colloids and their application as active matter

Choudhury, U.

University of Groningen, Zernike Institute for Advanced Materials, 2019 (phdthesis)

Abstract
In this thesis, the behavior of active particles spanning from single particle dynamics to collective behavior of many particles is explored. Active colloids are out-of equilibrium systems that have been studied extensively over the past 15 years. This thesis addresses several phenomena that arise in the field of active colloids.

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link (url) [BibTex]

link (url) [BibTex]


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Interfaces in fluids of ionic liquid crystals

Bartsch, H.

Universität Stuttgart, Stuttgart, 2019 (phdthesis)

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link (url) DOI [BibTex]

link (url) DOI [BibTex]

2013


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Brownian motion of optically trapped ellipsoids

Dibak, Manuel

Universität Stuttgart, Stuttgart, 2013 (mastersthesis)

icm

[BibTex]

2013


[BibTex]


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Phase behavior of colloidal suspensions with critical solvents

Mohry, T. F.

Universität Stuttgart, Stuttgart, 2013 (phdthesis)

icm

link (url) [BibTex]

link (url) [BibTex]


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Zweidimensionale Monte-Carlo-Gittersimulationen im muVT- und NpT-Ensemble

Kirn, Kai Ludwig

Universität Stuttgart, Stuttgart, 2013 (mastersthesis)

icm

[BibTex]

[BibTex]


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Permittivity of an inhomogeneous dipolar lattice fluid

Schütz, Christian

Universität Stuttgart, Stuttgart, 2013 (mastersthesis)

icm

[BibTex]

[BibTex]

2012


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Nanodroplets at topographic steps

Bartsch, H.

Universität Stuttgart, Stuttgart, 2012 (mastersthesis)

icm

[BibTex]

[BibTex]


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Janus particles in critical liquids

Labbe-Laurent, M.

Universität Stuttgart, Stuttgart, 2012 (mastersthesis)

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[BibTex]

[BibTex]


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Phase equilibria of binary liquid crystals

Klöss, Hans-Christian

Universität Stuttgart, Stuttgart, 2012 (mastersthesis)

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[BibTex]

[BibTex]


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Pinning of drops at superhydrophobic surfaces

Daschke, Lena

Universität Stuttgart, Stuttgart, 2012 (mastersthesis)

icm

[BibTex]

[BibTex]


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Impedance spectroscopy of ions at interfaces

Reindl, A.

Universität Stuttgart, Stuttgart, 2012 (mastersthesis)

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[BibTex]

[BibTex]


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Surface of an evaporating liquid

Arnold, Daniel

Universität Stuttgart, Stuttgart, 2012 (mastersthesis)

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[BibTex]

[BibTex]


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Statics and dynamics of critical Casimir forces

Tröndle, M.

Universität Stuttgart, Stuttgart, 2012 (phdthesis)

icm

link (url) [BibTex]

link (url) [BibTex]


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Critical Casimir forces beyond the Derjaguin approximation

Brunner, Niklas

Universität Stuttgart, Stuttgart, 2012 (mastersthesis)

icm

[BibTex]

[BibTex]


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Crystallization of flexible molecules

Held, Felix

Universität Stuttgart, Stuttgart, 2012 (mastersthesis)

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[BibTex]

[BibTex]

2001


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Einflußvon Teilchenbestrahlung auf die Selbst- und Interdiffusion in amorphen Fe-Zr-Legierungen

Schuler, T.

Universität Stuttgart, Stuttgart, 2001 (phdthesis)

icm

[BibTex]

2001


[BibTex]


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Diffusion im unterkühlten flüssigen und amorphen Zustand von Zr65Cu175,Ni10Al17,5

Schaaff, P.

Universität Stuttgart, Stuttgart, 2001 (phdthesis)

icm

[BibTex]

[BibTex]