Forum für Wissenschaft, Industrie und Wirtschaft

Hauptsponsoren:     3M 


Thin adaptive films


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


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 Treibjagd in der Petrischale
24.11.2017 | Friedrich-Schiller-Universität Jena

nachricht Dinner in the Dark – ein delikates Wechselspiel der Mikroorganismen
24.11.2017 | Universität Wien

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: Metamaterial mit Dreheffekt

Mit 3D-Druckern für den Mikrobereich ist es Forschern des Karlsruher Instituts für Technologie (KIT) gelungen ein Metamaterial aus würfelförmigen Bausteinen zu schaffen, das auf Druckkräfte mit einer Rotation antwortet. Üblicherweise gelingt dies nur mit Hilfe einer Übersetzung wie zum Beispiel einer Kurbelwelle. Das ausgeklügelte Design aus Streben und Ringstrukturen, sowie die zu Grunde liegende Mathematik stellen die Wissenschaftler in der aktuellen Ausgabe der renommierten Fachzeitschrift Science vor.

„Übt man Kraft von oben auf einen Materialblock aus, dann deformiert sich dieser in unterschiedlicher Weise. Er kann sich ausbuchten, zusammenstauchen oder...

Im Focus: Proton-Rekord: Magnetisches Moment mit höchster Genauigkeit gemessen

Hochpräzise Messung des g-Faktors elf Mal genauer als bisher – Ergebnisse zeigen große Übereinstimmung zwischen Protonen und Antiprotonen

Das magnetische Moment eines einzelnen Protons ist unvorstellbar klein, aber es kann dennoch gemessen werden. Vor über zehn Jahren wurde für diese Messung der...

Im Focus: New proton record: Researchers measure magnetic moment with greatest possible precision

High-precision measurement of the g-factor eleven times more precise than before / Results indicate a strong similarity between protons and antiprotons

The magnetic moment of an individual proton is inconceivably small, but can still be quantified. The basis for undertaking this measurement was laid over ten...

Im Focus: Reibungswärme treibt hydrothermale Aktivität auf Enceladus an

Computersimulation zeigt, wie der Eismond Wasser in einem porösen Gesteinskern aufheizt

Wärme aus der Reibung von Gestein, ausgelöst durch starke Gezeitenkräfte, könnte der „Motor“ für die hydrothermale Aktivität auf dem Saturnmond Enceladus sein....

Im Focus: Frictional Heat Powers Hydrothermal Activity on Enceladus

Computer simulation shows how the icy moon heats water in a porous rock core

Heat from the friction of rocks caused by tidal forces could be the “engine” for the hydrothermal activity on Saturn's moon Enceladus. This presupposes that...

Alle Focus-News des Innovations-reports >>>



im innovations-report
in Kooperation mit academics

Mathematiker-Jahrestagung DMV + GDM: 5. bis 9. März 2018 an Uni Paderborn - Über 1.000 Teilnehmer

24.11.2017 | Veranstaltungen

Forschungsschwerpunkt „Smarte Systeme für Mensch und Maschine“ gegründet

24.11.2017 | Veranstaltungen

Schonender Hüftgelenkersatz bei jungen Patienten - Schlüssellochchirurgie und weniger Abrieb

24.11.2017 | Veranstaltungen

Weitere VideoLinks >>>
Aktuelle Beiträge

Mathematiker-Jahrestagung DMV + GDM: 5. bis 9. März 2018 an Uni Paderborn - Über 1.000 Teilnehmer

24.11.2017 | Veranstaltungsnachrichten

Maschinen über die eigene Handfläche steuern: Nachwuchspreis für Medieninformatik-Student

24.11.2017 | Förderungen Preise

Treibjagd in der Petrischale

24.11.2017 | Biowissenschaften Chemie