Forum für Wissenschaft, Industrie und Wirtschaft

Hauptsponsoren:     3M 
Datenbankrecherche:

 

Thin adaptive films

04.09.2001


The research triplet Thin Films and Sensors is build up by the


modeling

The group "modeling" concentrates on the development and numerical implementation of mathematical models that are useful for the groups "thin adaptive films" and "smart materials".

One class of models is related to composite structures representing transducers and sensors. Transducers convert an electric input signal into elastic waves. Energy conversion is achieved by using the electric field of the signal to set a piezoelectric material of suitable crystallographic cut into mechanical vibration. The elastic waves are propagating either inside a substrate or close to its surface at a speed around 10^5 smaller then the electromagnetic waves.

This makes possible to estimate the signal delay caused by disturbances (e.g. absorbed biomolecules) which have to be measured. During propagation, elastic waves can interact with many obstacles such as interfaces between materials, electrodes, boundaries of the device and so on. Mathematical modeling allows us to choose right parameters of the device to achieve a good quality of the wave, which is the basis of good performance of the device.

Another class of models deals with magnetostrictive materials that can be precisely controlled through magnetic fields. In this convection, the distribution of magnetic field and the relation between mechanical deformations and the magnetic flux should be simulated.

Shape memory materials play a very important part in medical applications. The actual state of this research demands the development of mathematical models for multilayer composites. This should be done using the matching of elasticity theory and the theory of phase transitions. 

One of the most complex and important problems is the simulation of the coating process. The model involves stochastic partial differential equations which are derived from quantum mechanic considerations.


thin adaptive films

New functional materials to a large degree are the basis for new technological developments with an increasing importance of thin film and coating technology. There is a demand to include sensor and actuator devices in miniaturized form in the communication, automobile and medical technologies as well as in chemical process technologies. Related to this field of interest the group "Thin Adaptive Films" focuses on materials development for thin film sensors and actuators based on fundamental analysis of their structural and chemical properties in connection with their physical properties. The term "adaptive" is understood in the sense of self-adapting to a specific application environment or, in order to achieve the functional goals, being adapted by either a proper post-treatment or by external control (electrical, magnetic, thermal). By lithographic means such films can be miniaturized for the use in microstructured devices. A basis for the film applications is the choice of processing technique allowing a wide variation of deposition parameters. In the Thin Adaptive Film Laboratory modern methods of molecular beam epitaxy (MBE) for large area coatings are applied (see fig.1). By using advanced analytical and microscopic methods (variable temperature STM/AFM, parallel beam X-ray (micro-)diffraction, see fig. 2) the interdependencies of the physical functional properties and the structural/chemical properties are analyzed which then serve as a basis for an optimized processing technique. The work on the projects is jointly performed in collaboration with the theoretical group "Modeling and Simulation" and the engineering group "Smart Materials".


smart materials

The group "smart materials" concentrates on the development of smart materials in thin film form and their applications mainly in the area of microsystem technologies using cost-effective processes that are capable of mass-production. Smart materials directly transduce electrical, magnetic, or thermal energy into mechanical energy or vice versa and are therefore very attractive for the realization of micro-actuators and -sensors. The related physical effects are the magnetostriction, the piezoeffect, or the shape memory effect, respectively (fig. 1). Thin film fabrication processes are an attractive approach to fabricate smart materials as this technology is almost not material limited, offers easy downscaling into the mm-range by a cost-effective manufacturing technology, is compatible to microsystem technologies, avoids assembling and interconnection processes, and allows the realization of novel materials as e.g. multilayers which show superior behavior compared to their traditional bulk counterparts. These small and easy-to-integrate, "intelligent" micro-actuators and -sensors are essential for a high number of application areas as e.g. movable micro-optical components for the communication technology, tools for minimal invasive surgery, positioning elements for data storage devices, or remote-interrogated sensors for mechanical quantities like e.g. torque. The Smart Materials Laboratory at caesar provides magnetron sputtering (fig. 2) as well as photo lithography (fig. 3) for the fabrication of the materials and the devices as well as special equipment for the characterization of the physical effects and their high frequency properties.

Forschungszentrum caesar | Forschungszentrum caesar

Weitere Berichte zu: Adaptive Smart

Weitere Nachrichten aus der Kategorie Biowissenschaften Chemie:

nachricht Risikofaktor für Darmkrebs entschlüsselt
13.07.2018 | Max-Planck-Institut für Stoffwechselforschung

nachricht Algen haben Gene fürs Landleben
13.07.2018 | Julius-Maximilians-Universität Würzburg

Alle Nachrichten aus der Kategorie: Biowissenschaften Chemie >>>

Die aktuellsten Pressemeldungen zum Suchbegriff Innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Erste Beweise für Quelle extragalaktischer Teilchen

Zum ersten Mal ist es gelungen, die kosmische Herkunft höchstenergetischer Neutrinos zu bestimmen. Eine Forschungsgruppe um IceCube-Wissenschaftlerin Elisa Resconi, Sprecherin des Sonderforschungsbereichs SFB1258 an der Technischen Universität München (TUM), liefert ein wichtiges Indiz in der Beweiskette, dass die vom Neutrino-Teleskop IceCube am Südpol detektierten Teilchen mit hoher Wahrscheinlichkeit von einer Galaxie in vier Milliarden Lichtjahren Entfernung stammen.

Um andere Ursprünge mit Gewissheit auszuschließen, untersuchte das Team um die Neutrino-Physikerin Elisa Resconi von der TU München und den Astronom und...

Im Focus: First evidence on the source of extragalactic particles

For the first time ever, scientists have determined the cosmic origin of highest-energy neutrinos. A research group led by IceCube scientist Elisa Resconi, spokesperson of the Collaborative Research Center SFB1258 at the Technical University of Munich (TUM), provides an important piece of evidence that the particles detected by the IceCube neutrino telescope at the South Pole originate from a galaxy four billion light-years away from Earth.

To rule out other origins with certainty, the team led by neutrino physicist Elisa Resconi from the Technical University of Munich and multi-wavelength...

Im Focus: Magnetische Wirbel: Erstmals zwei magnetische Skyrmionenphasen in einem Material entdeckt

Erstmals entdeckte ein Forscherteam in einem Material zwei unabhängige Phasen mit magnetischen Wirbeln, sogenannten Skyrmionen. Die Physiker der Technischen Universitäten München und Dresden sowie von der Universität zu Köln können damit die Eigenschaften dieser für Grundlagenforschung und Anwendungen gleichermaßen interessanten Magnetstrukturen noch eingehender erforschen.

Strudel kennt jeder aus der Badewanne: Wenn das Wasser abgelassen wird, bilden sie sich kreisförmig um den Abfluss. Solche Wirbel sind im Allgemeinen sehr...

Im Focus: Neue Steuerung der Zellteilung entdeckt

Wenn eine Zelle sich teilt, werden sämtliche ihrer Bestandteile gleichmässig auf die Tochterzellen verteilt. UZH-Forschende haben nun ein Enzym identifiziert, das sicherstellt, dass auch Zellbestandteile ohne Membran korrekt aufgeteilt werden. Ihre Entdeckung eröffnet neue Möglichkeiten für die Behandlung von Krebs, neurodegenerative Krankheiten, Alterungsprozessen und Virusinfektionen.

Man kennt es aus der Küche: Werden Aceto balsamico und Olivenöl miteinander vermischt, trennen sich die beiden Flüssigkeiten. Runde Essigtropfen formen sich,...

Im Focus: Magnetic vortices: Two independent magnetic skyrmion phases discovered in a single material

For the first time a team of researchers have discovered two different phases of magnetic skyrmions in a single material. Physicists of the Technical Universities of Munich and Dresden and the University of Cologne can now better study and understand the properties of these magnetic structures, which are important for both basic research and applications.

Whirlpools are an everyday experience in a bath tub: When the water is drained a circular vortex is formed. Typically, such whirls are rather stable. Similar...

Alle Focus-News des Innovations-reports >>>

Anzeige

Anzeige

VideoLinks
Industrie & Wirtschaft
Veranstaltungen

Interdisziplinäre Konferenz: Diabetesforscher und Bioingenieure diskutieren Forschungskonzepte

13.07.2018 | Veranstaltungen

Conference on Laser Polishing – LaP: Feintuning für Oberflächen

12.07.2018 | Veranstaltungen

Materialien für eine Nachhaltige Wasserwirtschaft – MachWas-Konferenz in Frankfurt am Main

11.07.2018 | Veranstaltungen

VideoLinks
Wissenschaft & Forschung
Weitere VideoLinks im Überblick >>>
 
Aktuelle Beiträge

Interdisziplinäre Konferenz: Diabetesforscher und Bioingenieure diskutieren Forschungskonzepte

13.07.2018 | Veranstaltungsnachrichten

Maschinelles Lernen: Neue Methode ermöglicht genaue Extrapolation

13.07.2018 | Informationstechnologie

Fachhochschule Südwestfalen entwickelt innovative Zinklamellenbeschichtung

13.07.2018 | Materialwissenschaften

Weitere B2B-VideoLinks
IHR
JOB & KARRIERE
SERVICE
im innovations-report
in Kooperation mit academics