F&E1-BSS: Difference between revisions

Revision as of 14:20, 19 April 2013

Supervisor: PD Dr. Hendrik Hölscher

Overview of Scanning Probe Technologies

Welcome to the Scanning Probe Technologies group!

If you are looking for a collaboration or a group to do your Doctoral studies or Bachelor/Master thesis, you are in the right place! We are composed of physicist, mechanical and electrical engineers, having an expertise in characterization of the mechanical, physical and chemical properties of surfaces of any kinds in micro- and nano-level. We are passionate in building and modifying fancy AFM-microscopes, discovering the secrets of butterflies, gecko and interesting bio-inspired structures and working with very "cool" cold atoms. Within one group we work on different areas, which makes us even stronger.

Research

Atomic Force Microscopy

The analysis and development of new techniques for the microscopy and spectroscopy of surfaces on the nano-scale allows new insights into the nanoworld.

Current project: Cold atom scanning probe technology

Responsible person: Dr. Julia Syurik

Nano-Tribology

The exploration of the mechanical properties of nano-contacts and their frictional forces helps to understand the origin of friction and wear.

Mechanical Nano- and Micro-Resonators

Small mechanical resonators are frequently used as sensors. Due to their tiny size they sometimes reveal interesting physical effects not observable at the macro scale.

Current project: TMR sensor for AFM

Responsible person: Tobias Meier

Biomimetics

Some animals, insects and plants show fascinating surface effects caused by their specific microscopic surface structure. We analyse these phenomena and frequently it is possible to mimic them using nano- and microreplication techniques (cooperation with FuE3).

Current projects:

Rapid prototyping of Gecko adhesives and production and analysis of functional biomimetic surfaces

Responsible person: Michael Röhrig

Simulation and replication of the optical surfaces of butterfly structures

Responsible person: Radwanul Hasan Siddique

Water harvesting technique of desert beetles

Responsible person: Andreas Höpf

Nano-Transistor

Standby switches in electronic devices are currently responsible for the loss of 6.5% of the annual electricity consumption of an average household, and this value is predicted to increase to 15% by 2030. The project goal is the development of a standby switch device with nearly zero power consumption.

Current project: Development of single atom transistor

Responsible person: Dr. Maryna Kavelenka

Publications

Team

Group Leader

PD Dr. Hendrik Hölscher

Postdocs

PhD Researchers

Technical Stuff

Richard Thelen

Students

Andreas Höpf

AFM Workshop

News

Successful Replication of Hierarchical Gecko-type Structures

left|120x200px|thumb|alt=Example alt text Due to their outstanding adhesive properties, the gecko’s toes have been extensively investigated and serve now as a prototype for the ideal adhesive tape. Their impressive attachment system enables geckos not only to adhere to nearly any surface but also to detach within milliseconds. This famous feature is enabled by the hierarchical formation of delicate hairs covering their toes. These so-called setae, which are about 4 μm in diameter and 100 μm in length, split into the about 200 nm wide spatulae. With this hierarchical design, geckos achieve very intimate contact to flat and even to relatively rough surfaces enabling them to climb walls and ceilings only with the help of van-der-Waals interactions. Together with the Nanoscribe GmbH, we successfully introduced 3D direct laser writing (DLW) for the rapid prototyping of hierarchical gecko-inspired structures where the Young’s modulus and the relevant length scales match the gecko very closely. The obtained results show that hierarchical structures are favorable for stiff materials on the nanoscale. The results are published in: Hierarchical Structures: 3D Direct Laser Writing of Nano- and Microstructured Hierarchical Gecko-Mimicking Surfaces, by M. Röhrig, M. Thiel, M. Worgull, and H. Hölscher in Small 19, 2918 (2012).

Course on Surface Analysis Using Atomic Force Microscopy and Related Techniques

December 5, 2013
Seminar Room of the Institute of Microstructure Technology (Campus North)

Lecturer: Hendrik Hölscher (IMT), Richard Thelen (IMT), Bärbel Krause (ISS)

09:30 Basic Principles of Atomic Force Microscopy

10:30 Coffee break

11:00 Image Processing in Scanning Probe Microscopy

11:30 Adhesion and Friction Measurements Using Atomic Force Microscopy

12:00 Lunch break

13:30 Dynamic Force Microscopy (“Tapping-”, AC- and “Noncontact”-mode)

14:30 Stylus Profilometry versus Multisensor Coordinate Measurement for 3D Surfaces - a brief Comparison (Richard Thelen, IMT)

15:15 Coffee break

15:45 AFM and X-ray scattering as complementary methods for probing the sample morphology (Bärbel Krause, ISS)

16:30 Outlook & Discussion

17:00 End of course

Please send a short email to hendrik.hoelscher@kit.edu if you would like to attend.

Contact

Thank you for your interest. For more details, please contact:

PD Dr. Hendrik Hölscher
Karlsruhe Institute of Technology
Institute of Microstructure Technology
Hermann-von-Helmholtz-Platz 1
76344 Eggenstein-Leopoldshafen

Phone: +49 721 608-22779
Fax: +49 721 608-24331
Email: hendrik.hoelscher@kit.edu

@@ Line 68: / Line 68: @@
 === '''Successful Replication of Hierarchical Gecko-type Structures''' ===
-[[Datei:2013_01_Geckos_Small8Rohrig.png|left|thumb|alt=Example alt text]]
+[[Datei:2013_01_Geckos_Small8Rohrig.png|left|120x200px|thumb|alt=Example alt text]]
 Due to their outstanding adhesive properties, the gecko’s toes have been extensively investigated and serve now as a prototype for the ideal adhesive tape. Their impressive attachment system enables geckos not only to adhere to nearly any surface but also to detach within milliseconds.
 This famous feature is enabled by the hierarchical formation of delicate hairs covering their toes. These so-called setae, which are about 4 μm in diameter and 100 μm in length, split into the about 200 nm wide spatulae. With this hierarchical design, geckos achieve very intimate contact to flat and even to relatively rough surfaces enabling them to climb walls and ceilings only with the help of van-der-Waals interactions. Together with the Nanoscribe GmbH, we successfully introduced 3D direct laser writing (DLW) for the rapid prototyping of hierarchical gecko-inspired structures where the Young’s modulus and the relevant length scales match the gecko very closely. The obtained results show that hierarchical structures are favorable for stiff materials on the nanoscale.
@@ Line 77: / Line 77: @@
 === Course on Surface Analysis Using Atomic Force Microscopy and Related Techniques ===
-December 5, 2013<br>
+'''December 5, 2013'''<br>
-Seminar Room of the Institute of Microstructure Technology (Campus North)<br>
+'''Seminar Room of the Institute of Microstructure Technology (Campus North)'''<br>
 Lecturer: Hendrik Hölscher (IMT), Richard Thelen (IMT), Bärbel Krause (ISS)