- Sina Burkert
- Smrati Gupta
- Christian Hanzelmann
- Eva Herold
- Anja Rollberg
- René Winkler
- Dr. Susanne Höhne
- Dr. Martin Messerschmidt
- Dr. Larysa Samokhina
- Dr. Petra Uhlmann
- Manufacture and study of adaptive surface functions (partly with one and two dimensional characteristics gradients) for the control of wetting and adsorption on flat and spheric substrates
- Switching of surface properties using different triggers as temperature, solubility, pH-value, ion strength
- Study and control of interaction of functional or adaptive polymer layers with nano and micro particles as well as (bio) polymers
- Modification and structuring of polymer brushes by electron irradiation
- Application of polymer brushes for the fabrication of functional coatings, for sensors and tuning of bio-adsorption
Grafting techniques have advantages over other approaches to create thin functional films because of several reasons. They include easy and controllable introduction of polymer chains with a high surface density, precise localization of the chain at the surface, and long stability of the grafted layers. The use of polymer brushes is on the one hand a very promising mean to create those new surface functionalities as switchability or response to environmental conditions and on the other hand an effective manner to tune the relevant surface properties for many applications, as wettability, adhesion, lubrication, friction, biocompatibility or, for particles, colloidal stability. The factors influencing synthesis and properties of such layers were the subject of numerous experimental and theoretical studies during the last years. Generally the behavior of those ultrathin polymeric layers is strongly dependent on the grafting density, the molecular weight and chemical composition of the polymer chains. Linear polymer chains grafted on the surface are gaining a brush like conformation if the distance of the chains is becoming smaller than the double of the radius of gyration of the macro molecules. In this case the polymer chains are taking a conformation stretched away from the surface because of excluded volume effects.
Heterogeneous binary polymer brushes, which are experimentally investigated only recently, are created by grafting two incompatible polymers one after the other on the surface. The covalent bonds to the substrate are preventing that the polymer film is separating macroscopically into the two polymer components. Those films have shown to be a versatile tool to create, in dependence on the grafting density, stable homogeneous or flexible responsive functional coatings. In the latter case it is possible to switch the surface properties of the film between the properties of two incompatible polymers by external stimuli, as e.g. temperature, solvent, electrical field, pH value.
For the fabrication of binary brushes grafting from“ (as radical polymerisation at the interface) and „grafting to“ (as tethering of the polymer chains from solution) methods were developed and investigated in detail.
The amplification of the amplitude of switching (from superhydrophilic to ultrahydrophobic) by creating hierarchically structured surfaces was investigated as well as the creation of switchable surface structures by environmental responsive lithography. Binary polymer brushes can also be used to create thin films with gradients of the layer thickness or even switchable gradients of surface hydrophobicity/ hydrophilicity.
A very interesting task is also the interaction of polymer brushes with nanoparticles and proteins. The interaction of globular model proteins with mixed polylelectrolyte brushes, i.e. brushes composed of two oppositely charged polyelectrolytes was investigated in dependence pH and buffer salt concentration, and the adsorption mechanism was studied in detail. So called “counter ion evaporation” seems to be a major driving force for protein adsorption on mixed polyelectrolyte brushes under certain conditions.
- Prof. Matthias Ballauff,
- Prof. Alexander Eychmüller,
- Dr. Bassel Haidar, Dr. Karine Mougin,
CNRS Mulhouse, France
- Dr. Karsten Hinrichs,
- Prof. Friedrich Kremer,
- Prof. Igor Luzinov,
Clemson University, USA
- Prof. Sergiy Minko,
Clarkson University, USA
- Prof. Marcus Müller,
- Prof. Peter Müller-Buschbaum,
- Dr. Volkmar Stenzel, Dr. Ulrike Mock,
Fraunhofer IFAM Bremen
- Prof. Eberhard Wobst,
- Prof. Thomas Wolff,
- Sächsisches Landesgymnasium St. Afra, Meißen (BeLL)
Most important Publications
- Gupta, S.; Uhlmann, P.; Agrawal, M.; Lesnyak, V.; Gaponic, N.; Simon, F.; Stamm, M.; Eychmüller, A.
Covalent immobilization of quantum dots on macroscopic surfaces using poly(acrylic acid) brushes mehr
Journal of Materials Chemistry 18 (2008) 214-220
- Uhlmann, P.; Houbenov, N.; Ionov, L.; Motornov, M.; Minko, S.; Stamm, M.
Oberflächen passen sich an - bürstenartige Polymermoleküle an Oberflächen mit schaltbaren Eigenschaften mehr
Wissenschaftliche Zeitschrift der Technischen Universität Dresden 56 (2007) 47-51
- Burkert, S.; Müller, M.; Uhlmann, P.; Stamm, M.
Sensitive swelling and controlled protein adsorption on thin polymer brush layers mehr
Macromolecular Reaction Engineering 1 (2007) F25-F26
- Uhlmann, P.; Houbenov, N.; Brenner, N.; Grundke, K.; Stamm, M.
In-situ investigation of the adsorption of globular model proteins on stimuli responsive binary polyelectrolyte Brushes mehr
Langmuir 23 (2007) 57-64
- Burkert, S.; Müller, M.; Uhlmann, P.; Stamm, M.
In-situ Investigation of the Grafting Reaction and the Temperature Sensitive Swelling of PNIPAAM Brushes Using ATR-FTIR mehr
Polymeric Materials: Science and Engineering 51 (2006) 723-724
- Ionov, L.; Houbenov, N.; Sidorenko, A.; Stamm, M.; Minko, S.
Smart Microfluidic Channels mehr
Advanced Functional Materials 16 (2006) 1153-1160
- Uhlmann, P.; Ionov, L.; Houbenov, N.; Nitschke, M.; Grundke, K.; Motornov, M.; Minko, S.; Stamm, M.
Surface functionalization by smart coatings: stimuli-responsive binary polymer brushes mehr
Progress in Organic Coatings 55 (2006) 168-174
- Uhlmann, P.; Houbenov, N.; Minko, S.; Stamm, M.
Surface functionalization by smart binary polymer brushes to tune physiko-chemical characteristics at biointerfaces mehr
e-Polymers : http://www.e-polymers.org no. 075 (2005) 1-10
- Motornov, M.; Stamm, M.; Minko, S.
Responsive Nanoparticles with Hydrophobic/Hydrophilic Behavior mehr
Polymer Preprints 46 (2005) 78-79
- Minko, S.; Usov, D.; Stamm, M.
Mechanism of phase Segregation in Mixed Polymer Brushes mehr
Polymer Preprints 46 (2005) 39-40
- Houbenov, N.; Ionov, L.; Minko, S.; Stamm, M.
Control of Protein Adsorption on Responsive Polymer Surfaces mehr
Polymer Preprints 46 (2005) 1229-1230
- Ionov, L.; Sidorenko, A.; Eichhorn, K.-J.; Stamm, M.; Minko, S.; Hinrichs, K.
Stimuli Responsive Mixed Grafted Polymer Films with Gradually Changing Properties: Direct Determination of Chemical Composition mehr
Langmuir 21 (2005) 8711-8716
- Hoffmann, F.; Wolff, T.; Minko, S.; Stamm, M.
Photochemical structuring and fixing of structures in binary polymer brush layers via 2p+2p photodimerization mehr
Journal of Colloid and Interface Science 282 (2005) 349-358
- Ionov, L.; Sidorenko, A.; Stamm, M.
Gradient Mixed Brushes: "Grafting To" approach mehr
Macromolecules 37 (2004) 7421-7423
- Ionov, L.; Houbenov, N.; Sidorenko, A.; Stamm, M.; Luzinov, I.; Minko, S.
Inverse and Reversible Switching Gradient Surfaces from Mixed Polyelectrolyte Brushes mehr
Langmuir 20 (2004) 9916-9919
- Usov, D.; Nitschke, M.; Chitry, V.; Ulbrich, K.; Minko, S.; Stamm, M.
Mixed Polymer Brushes with Thermal Response Amplified by Roughness mehr
Polymeric Materials: Science and Engineering 90 (2004) 622-623
- Houbenov, N.; Minko, S.; Stamm, M.
Mixed Polyelectrolyte Brush from Oppositely Charged Polymers for Switching of Surface Charge and Composition in Aqueous Environment mehr
Macromolecules 36 (2003) 5897-5901
- Ionov, L.; Minko, S.; Stamm, M.; Gohy, J.F.; Jérome, R.; Scholl, A.
Reversible Chemical Patterning on Stimuli-Responsive Polymer Film - Environment Responsive Lithography mehr
Journal of the American Chemical Society 125 (2003) 8302-8306
- Minko, S.; Luzinov, I.; Luchnikov, V.; Müller, M.; Patil, R.D.; Stamm, M.
Bidisperse Mixed Brushes: Synthesis and Study of Segregation in Selective Solvent mehr
Macromolecules 36 (2003) 7268-7279
- Lemieux, M.; Usov, D.; Minko, S.; Stamm, M.; Shulha, H.; Tsukruk, V. V.
Reorganization of Binary Polymer Brushes: Reversible Switching of Surface Microstructures and Nanomechanical Properties mehr
Macromolecules 36 (2003) 7244-7255
- Lemieux, M.; Minko, S.; Usov, D.; Stamm, M.; Tsukruk, V. V.
Direct Measurement of Thermoelastic Properties of Glassy and Rubbery Polymer Brush Nanolayers Grown by "Grafting-from" Approach mehr
Langmuir 19 (2003) 6126-6134
- Minko, S.; Müller, M.; Motornov, M.; Nitschke, M.; Grundke, K.; Stamm, M.
Two-level Structured Self-Adaptive Surfaces with Reversibly Tunable Properties mehr
Journal of the American Chemical Society 125 (2003) 3896-3900
- Minko, S.; Müller, M.; Usov, D.; Scholl, A.; Froeck, C.; Stamm, M.
Lateral versus Perpendicular Segregation in Mixed Polymer Brushes mehr
Physical Review Letters 88 (2002) 3550-2 - 35502-4
- Minko, S.; Patil, R.D.; Stamm, M.
Synthesis of Adoptive Polymer Brushes via "Grafting To" Approach From Melt mehr
Langmuir 18 (2002) 289-296
- Minko, S.; Usov, D.; Goreshnik, E.; Stamm, M.
Environment-Adopting Surfaces with Reversibly Switchable Morphology mehr
Macromolecular Rapid Communications 22 (2001) 206-211