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Özlem Akyüz

Ph.D Student

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Phone: +49 7531  88-3111

Room: Z 938

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Vincent Brill , BSc

Ph.D Student

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Phone: +49 7531  88-3173

Room: Z 937

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Julian Brunner

Academic staff

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Phone: +49 7531  88-5462

Room: L 1053

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Zongkun Chen, MSc

Ph.D Student

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Phone: +49 7531  88-4808

Room: L 1051

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Responsibilities

Education

10/2016 - Present
University of Konstanz: PhD candidacy in the group of Prof. Dr. Helmut Cölfen, Department of Chemistry

09/2013 - 06/2016
Ocean University of China: Master of Science, Department of Material Science and Engineering 
Master thesis:
“Non-Platinum Hollow Carbon Spheres-Based Electrocatalysts for Oxygen Reduction Reaction”

09/2009 - 06/2013
Qingdao University of Science&Technology
Bachelor of Science, Department of Material Science and Engineering

Research interests

Two-dimensional (2D) nanomaterials are one of the most widely investigated classes of materials because of their unique electronic, optical, catalytic, mechanical, and other properties(1-3). Unfortunately, the existing methods are far from practical application, because many technical issues related to high cost (special equipment, expensive reactant), tedious operation (post-treatment, exfoliation operation), low quality (non-uniform shape and size) and eco-unfriendly process (non-green solvent) process remain to be addressed. For instance, the presence of toxic solvent and high- temperature/pressure working condition in the synthesis process are hazardous threats to both environment and researchers, while the experimental methodology varied from one compound to the other, prohibiting the development of a generalized synthesis method. Therefore, it has been increasingly urgent to propose a satisfactory strategy to synthesize 2D nanomaterials with uniform shape and size while avoiding the mentioned deficiencies. I try to synthesize 2D nanomaterials using a general and satisfactory strategy, under the condition of water phase, room temperature and additive-free, based on the adjustment of the relative growth rates of various crystallographic facets.

1. F. Bonaccorso, L. Colombo, G. Yu, M. Stoller, V. Tozzini, A. C. Ferrari, R. S. Ruoff, V. Pellegrini, Science, 2015, 347, 1246501.
2. N. Mounet, M. Gibertini, P. Schwaller, D. Campi, A. Merkys, A. Marrazzo, T. Sohier, I. E. Castelli, A. Cepellotti, G. Pizzi, N. Marzari, Nature nanotechnology, 2018, 13, 246-252. 
3. M. Chhowalla, H. S. Shin, G. Eda, L. J. Li, K. P. Loh, H. Zhang, Nature chemistry, 2013, 5, 263-275.

Publications

  1. Z. K. Chen, D. D. He, X. J. Xu, Z. Z. Liu, M. H. Huang*, X.Wang*, H. Q. Jiang. RSC Adv., 2016, 6, 34159-34164.
  2. Z. K. Chen, F. L, D. D. He, H. Q. Jiang, J. J. Zhang, X. Wang, M. H. Huang*. New J. Chem., 2017, 41, 4959-4965.
  3. X. J. Xu, P. Y. Du, Z. K. Chen, M. H. Huang*. J. Mater. Chem. A, 2016, 4, 10933-10939.
  4. D. D. He, G. H. He, H. Q. Jiang, Z. K. Chen, M. H. Huang*.Chem. Commun., 2017, 53, 5132-5135.

Prof. Dr. Helmut Cölfen

Group head

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Phone: +49 7531  88-4063

Room: L 1006

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Christian Debus, MSc

Ph.D Student

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Phone: +49 7531  88-2001

Room: L 1050

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Responsibilities

Education:

03/2013

University of Konstanz: PhD candidacy in the group of Prof. Dr. Helmut Cölfen, Department of Chemistry

 

10/2012 - 03/2015

University of Konstanz: Master of Science, Department of Chemistry

 

05/2014 - 02/2015

Master thesis in the group of Prof. Dr. Helmut Cölfen: “Complex Polyelectrolyte-Induced Vanadium Pentoxide Superstructures”

 

10/2009 - 9/2012

University of Konstanz: Bachelor of Science, Department of Chemistry

 

03/2012 - 09/2012

Bachelor thesis in the group of Prof. Dr. Sebastian Polarz: “Mesoporöse Organosilikate zur Verankerung von organischen Polymeren in den Poren“ Research interests: “Multifunctional layered magnetite composites”

 

Research interests:

“Multifunctional layered magnetite composites”

Lisa Maria Fuhrer, BSc

Ph.D Student

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Phone: +49 7531  88-4808

Room: L 1051

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Marina Galetskaya

Technical Support

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Phone: +49 7531  88-2021

Room: L 1031

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Michael Gießl

Ph.D Student

Contact

Phone: +49 7531  88-5462

Room: L 1052

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Guillermo González-Rubio

Post Doc

Contact

Phone: +49 7531  88-2026

Room: L 1053

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Dominik Gruber

Ph.D Student

Contact

Phone: +49 7531  88-5461

Room: L 1052

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Responsibilities

Education:

07/2016 – Present
University of Constance: Ph. D. candidacy in Material Chemistry

08/2015 - 06/2016
University of Constance: Master of Science Thesis: “Schaltbare Polymere zur Funktionalisierung magnetischer Nanopartikel” Workgroup: Prof. Dr. Helmut Cölfen

06/2014 – 07/2014
University of California, Berkeley Internship Supervision: Jill Banfield

10/2013 – 07/2015
University of Constance: Master courses in Nanoscience

07/2013 - 09/2013
University of Constance: Bachelor of Science Thesis: “Benetzungseigenschaften flüssiger Mineralvorstufen” Workgroup: Prof. Dr. Helmut Cölfen

10/2010 – 07/2013
University of Constance: Bachelor courses in Molecular Material Science Research interests: Biomineralization, Biomimetics 

Research interests:

Biomineralization, Biomimetics 

Ann-Kathrin Göppert

Ph.D Student

Contact

Phone: +49 7531  88-2001

Room: L 1050

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Responsibilities

Education

2017
University of Konstanz, Ph. D. candidacy, Department of Chemistry
Work group: Prof. Dr. Helmut Cölfen (Physikalische Chemie) 

2014-2016
University of Konstanz, Master of Science, Department of Chemistry
Master thesis: “Leitfähige Polymere in porösen Materialien als Superkondensatoren“
Work group: Prof Dr. Helmut Cölfen (Physikalische Chemie) 

11/2013-02/2014
tesa SE, Hamburg
Internship in F&E Rubber Technology                                              

Project: “Untersuchungen zum Einfluss des verfahrensbedingten Polymerabbaus auf die klebtechnischen und rheologischen Eigenschaften von Haftklebemassen auf Naturkautschukbasis“                                              

2010-2014
University of Konstanz, Bachelor of Science, Department of Chemistry

Bachelor thesis: “Einbettung von anorganischen Quantenpunkten in Siliziumdioxid- und Polymernanopartikel”
Work group: Prof. Dr. Stefan Mecking (Chemische Materialwissenschaft)

Research interest 

“Heterogenous nucleation with anisotropic particles” Project B3 SFB1214 

https://www.sfb1214.uni-konstanz.de/en/sfb1214/

Dirk Haffke

Technical Support

Contact

Phone: +49 7531  88-2019

Room: L 1050

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Andra-Lisa Hoyt, MSc

Ph.D Student

Contact

Phone: +49 7531  88-2001

Room: L 1050

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Responsibilities

Education: 

01/2018 - Present
University of Konstanz: DBU-Fellow and Doctoral Candidate with Prof. Dr. Cölfen, Department of Chemistry 

07/2017 - 09/2017
BASF, Ludwigshafen: Internship in Research and Development

 06/2014 - 04/2017
University of Konstanz: Master studies and Thesis with Prof. Dr. Cölfen, Department of Chemistry
"Calcium Carbonate Precursor Formulations for Consolidation and Restoration of Carbonate-based Artifacts"

09/2013 - 05/2014
University of Massachusetts Amherst: Graduate Studies Abroad in the Chemistry Department and Research Internship in the Polymer Science & Engineering Department with Prof. Dr. Briseno

10/2010 - 08/2013
University of Konstanz: Bachelor studies and Thesis with Prof. Dr. Winter, Department of Chemistry
"Divinylphenylenverbrückte heterobimetallische Ru/Os-Komplexe: Synthese neuer Verbindungen und Studium der elektronischen Struktur"

Research Interests: 

"Preservation of carbonate-based natural materials based on a better understanding of crystallization processes in pores"
Liquid Precursors, Calcium Carbonate, Stone Conservation

Benedikt Häusele

Ph.D Student

Contact

Phone: +49 7531  88-4808

Room: L 1051

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Responsibilities

Education:

01/2014 - present
University of Konstanz: Ph.D. candidacy in chemistry

04/2013 - 11/2013
Master thesis at the group of Prof. Dr. Helmut Cölfen in cooperation with the group of Prof. Dr. Elke Deuerling: "Biophysical analysis of amyloid fibrillogenesis"

03/2012 - 09/2012
German Cancer Research Center (DKFZ), Heidelberg Research internship at the group of Prof. Dr. Jörg Langowski: "Development of control software for fluorescence correlation microscopy"

10/2010 - 11/2013
University of Konstanz:  Master studies in Biological sciences, courses in Membrane Biophysics, Protein X-ray Crystallography, Bioinformatics, Analytical Biochemistry and Economics

05/2010 - 09/2010
Bachelor thesis at the group of Prof Dr. Bernhard Schink: "Purification of ferredoxine from Pelobacter acetylenicus

10/2007 - 09/2010
Bachelor studies in Biological sciences, University of Konstanz

Research interest:

Development of an on-line Raman detector coupled to Field-Flow Fractionation Asymmetrical
 Flow Field-Flow Fractionation is an analytical technique that can be used to separate a mixed sample according to the diffusion coefficients of the single species. Similarly to other analytic chromatographic techniques, data are collected by a detector series. While Light scattering, UV/Vis or refractive index detection primarily yield "macroscopic" properties, a Raman detector would provide information about the constitutions of the species as well as about molecular interactions in complexes.
 A basical Raman setup can be realized simply by using a laser, flow cell, monochromator and detector. However, due to the separation principle of FFF, the amount of sample and the detectable concentration is limited. As native Raman scattering is a comparably weak effect, several approaches are recombined to get a sufficient signal intensity.

Global analysis approaches
Fractionating separation methods like Analytical Ultracentrifugation (AUC) and FFF are widely used to characterize nanoscopic systems, including the investigation of molecules of biological origin as well as artificial colloidal systems. Based on existing measurement methods and their corresponding theory, new measurement approaches are investigated in order to increase the "yield of information" which can be drawn from the measurements. This includes the development of new measurement procedures, accompanied by the elaboration and implementation of suitable evaluation algorithms. The existing formalisms are systemically restudied for possible synergies. Basic techniques considered this way are AUC, FFF, Electrophoresis, Light scattering, UV/Vis and Vibrational Spectroscopy. Protein aggregation Protein aggregation procesesses are assumed to be involved in pathogenesis of several neurodegenerative diseases such as Alzheimer's and Parkinson's disease. It is known that soluble proteins form amyloid fibrils. However, neither the mechanism of cellular toxicity nor the biophysical aggregation has been fully understood by now. In addition, aggregation can prevent the therapeutic effectiveness of biopharmaceuticals. Application of nove developed analytical methods might provide new insights into and the interaction of aggregating species with their intracellular environment.

Marie Jehannin, Dr.

Post Doc

Contact

Phone: +49 7531  88-2026

Room: L 1053

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Responsibilities

01/2018-present
University of Konstanz, Postdoctoral researcher in the Physical Chemistry department with Prof. Dr. Helmut Cölfen on Mesocrystal formation for new Electrode Material. 

02/2016-12/2017
Australian National University, Postdoctoral researcher in the Research School pf Physic and Engineering, Department of Applied Mathematics with Prof. Vince Craig on the Stability of Surface and Bulk Nanobubbles. 

09/2012-12/2015
PhD candidate in physical-chemistry shared between the French Commission for Alternative and Atomic Energy with Prof. Thomas Zemb and Dr. Sophie Charton and the Max Planck Institute of Colloids and Interfaces with Prof. Helmuth Moehwald and Dr. Hans Riegler. Dissertation: "About the role of physico-chemical properties and hydrodynamics on the progress of a precipitation reaction"

Christian Jenewein, MSc.

Ph.D Student

Contact

Phone: +49 7531  88-5462

Room: L 1052

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Responsibilities

Education

10/2017 - today
University of Konstanz, Ph. D. candidacy, Department of Chemistry
Work Group: Prof. Dr. Helmut Cölfen (Physikalische Chemie)

03/2016 - 06/2016
University of Florida, Gainesville FL
Internship at Gower Biomimetics Laboratory (Department of Materials Science and Engineering)
Project: “Investigation of calcium carbonate mineralization on quartz sand surfaces via the Polymer Induced Liquid Precursor (PILP) process“

2014 - 2017
University of Konstanz, Master of Science, Department of Chemistry
Master thesis: “Development of a PILP based solidifying method for quartz sand“
Work Group: Prof. Dr. Helmut Cölfen (Physikalische Chemie) in collaboration with Dr. Laurie Gower and Dr. Scott Wasman (University of Florida)

2010 - 2014
University of Konstanz, Bachelor of Science, Department of Chemistry
Bachelor thesis: “Controlled fluorene polymerization initiated by dyes featuring four in-situ initiation sites“
Work Group: Prof. Dr. Stefan Mecking (Chemische Materialwissenschaft)

Research interest:

“Binary Mesocrystals“
With metamaterials becoming a key technology in the 21st century, the demand for defined structuration of matter on the nanoscale, is increasing alongside the applicability of these materials in the fields of electronics, catalysis and medicine. 

My research is focused on the self-assembly of anisotropic nanoparticles in order to utilize the obtained knowledge to ultimately create binary mesocrystals. Therefore, it is crucial to make use of nanoparticles with suitable habitus ratios to facilitate binary self-assembly within a mesocrystalline superstructure. This can be achieved through size and shape controlled synthesis of ferrite, cobalt-ferrite, platinum nanocubes as well as manganese-tetroxide nanocuboids. Successful promotion of mesocrystal formation through further investigation of corresponding 2D and 3D self-assembly in various approaches such as Gas-Phase-Diffusion, Drying-Mediated or Langmuir-Blodgett Film Deposition show promising results towards a binary mesocrystal formation. Analytical methods in order to characterize these structures require extensive utilization of HRTEM (ED/EELS/ElementMapping), SEM, EDX, XRD as well as SAXS and WAXS measurements.

Publications:

Christoph S. Fischer, Christian Jenewein, and Stefan Mecking*; Conjugated Star Polymers from Multidirectional Suzuki-Miyaura Polymerization for Live Cell Imaging, Macromolecules, 2015, 48 (3), pp 483-491

Awards:

2018
Best Oral Poster Presentation at “The sixth European Conference on Crystal Growth“, Varna, Bulgaria, September 16-20, 2018

Philipp Maximilian Keckeis

Ph.D Student

Contact

Phone: +49 7531  88-3173

Room: Z 937

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Responsibilities

Research Interest

My current interest is focused on the development of block copolymers and their application as macromolecular solubilizers for hardly soluble crystals, such as Hydroxyapatite and hydrophobic substances e.g. cholesterol, in the nano-medicinal context.

Cholesterol and Hydroxyapatite represent elemental compounds of high-risk, endogenous atherosclerotic plaques, which induce coronary atherosclerosis and other related cardiovascular diseases causing 40 % of the annual European Deaths.[1] As an approach to this problem, I am investigating peptide-based, multifunctional block copolymers with incorporated disparate chemical entities for the simultaneous interaction with hydrophobic components and mineral Hydroxyapatite.

In detail, this involves the synthesis and characterization of organic monomers, initiators and functional molecules for the polymerization of different classes and types of block copolymers and their post-polymerization modification. After that, I am interested in the morphology of the self-assembled nano-associates and their sizes, and furthermore, how structure-property relationship of the polymers is affected by polarity fine-tuning. Finally, the polymer particles are investigated with respect to the ability to solubilize poorly watersoluble substances including quantification of the encapsulated materials as well as morphological changes. This polymer screening reveals favorable polymer architectures as potential candidates for drug delivery and as nano-medicinal devices for atherosclerotic plaque solubilization.

  1. N. Townsend, L. Wilson, P. Bhatnagar, K. Wickramasinghe, M. Rayner, M. Nichols, European Heart Journal 2016, 37, 3232-3245.

 

Remit :

  • Synthesis of multifunctional block copolymers
    Synthesis of organic molecules, Polymerization, Post-Polymerizations-Modification, Characterization (NMR, GPC, Maldi-TOF, ESI-MS, GC-MS, LC-MS, IR, etc.)
  • Structural characterization of the nanocomposites
    TEM, cryo-TEM, AFM, SAXS, AUZ, DLS, FFF, Fluorescence-measurement, Zeta-potential-measurement, etc.
  • Cholesterol extraction from artificial arteriosclerotic plaques 
    Standardized test systems, advanced biological test-systems, cell experiments

Sascha Keßler, MSc

Ph.D Student

Contact

Phone: +49 7531  88-2002

Room: L 1053

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Responsibilities

Education

04/2017
University of Konstanz, Ph. D. candidacy, Department of Chemistry
Working group: Prof. Dr. Helmut Cölfen (Physical Chemistry)

10/2014 – 03/2017
University of Konstanz, Master of Science, Department of Chemistry
Master Thesis: “Covalently Connected Hybrids of Elastomers with Silica Nanoparticles“
Working group: Prof Dr. Stefan Mecking (Material Science) 

10/2011 - 09/2014
University of Konstanz, Bachelor of Science, Department of Chemistry
Bachelor Thesis: “Preparation and Ligand Exchange of Silver Nanowires with Single Crystalline Faces”
Working group: Prof. Dr. Helmut Cölfen (Physical Chemistry)

Research Interest

My research interest focuses on designing environmentally compatible, sustainable and clean surfaces for energy conversion devices to overcome and replace the traditional fossil fuel operated devices. In order to synthesize nanomaterials with comparable properties according to platinum-based electrocatalysts, an increase of the inner surface is necessary. The high inner surface compensates the reduced electrocatalytic activity of the non-platinum containing nanomaterials. Typically, hierarchical superstructures enable such a high inner surface.  

This project aims to synthesize hierarchical electrocatalytic materials by synthesizing functional iron, nickel- and cobalt-based nanoparticles such as Prussian Blue Analogues or iron(II,III) oxide followed by a bio-inspired self-assembly of the nanoparticulate building blocks. In terms of the economical and green chemistry aspects, the syntheses and self-assembly processes are performed in water and at room temperature. Additionally, conductive template systems such as functionalized carbon nanotubes or silver nanowires are employed on the one side to control and support the formation of hierarchical superstructures and on the other side to introduce a conductive environment. Besides, the water-based syntheses at room temperature enable a facilitated access for analytical methods (e.g. analytical ultracentrifugation, analytical titration) to monitor the growth mechanism of the nanoparticulate building blocks and the early stages of crystallization.

Conference Contributions 

The sixth European Conference on Crystal Growth – Varna (Bulgaria). Kessler S., Cölfen H. (2018). Iron- and Ccobalt-based Nanoparticles as Electrode Materials

Felizitas Kirner, MSc.

Ph.D Student

Contact

Phone: +49 7531  88-3111

Room: Z 938

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Responsibilities

Education

Since 01/2018
University of Konstanz, Germany
Department of Chemistry,
Ph.D. candidacy in Dr. Elena Sturm’s Group (Physical Chemistry) 

10/2015‒ 11/2017
University of Konstanz, Germany
Master of Science, Department of Chemistry,
Master Thesis in the group of Prof. Dr. Helmut Cölfen/Dr. Elena Sturm: “Self-assembled Gold Mesocrystals”

09/2012‒ 09/2015
University of Konstanz, Germany
Bachelor of Science, Department of Chemistry
Bachelor Thesis in the group of Prof. Dr. Sebastian Polarz: “Nanoporöse Siliziumoxide und Silizium-Metall-Mischoxide mit definierter Porenstruktur”

Research Interest 

My research interest involve the influence of differences in shapes and sizes of gold nanoparticles on the self-assembly process, structure and properties of mesocrystals. 
Project B1 SFB1214 “ Mesocrystals: Formation, structure and properties” www.sfb1214.uni-konstanz.de/en/sfb1214/

 Mesocrystals are defined as “a nanostructured material with a defined long-range order on the atomic scale, which can be inferred from the existence of an essentially sharp wide-angle diffraction pattern (with sharp Bragg peaks) together with clear evidence that the material consists of individual nanoparticle building units”[1]. Mesocrystalline material can combine the properties of an individual nanoparticle, such as surface plasmon resonance, with a mesostructure and morphology that is tailored specifically. The composition from aligned, anisotropic nanocrystals can lead to strong directional properties. Thus mesocrystals have a high potential in materials science.[2] A major challenge in the observation of mesocrystal formation is the huge size range and the different time scales during which the formation occurs. Fundamental principles of their formation and structuration processes are poorly understood, hindering their tailored synthesis and limiting functionality.[3] Mesocrystals occur naturally in biomaterials[4], but can also be generated synthetically and are reported in literature e.g. from the semiconductor PbS[5] and magnetic magnetite[6] nanoparticles. Metallic nanoparticles are special due to their optical and catalytic properties. The investigation of mesocrystals built from Au nanoparticles therefore complements the existing research to mesocrystal and their structure property relationship. 

  1. H. Cölfen, M. Antonietti, Mesocrystals and nonclassical crystallization, Wiley, Chichester, England ; Hoboken, NJ, 2008
  2. E. V. Sturm, H. Cölfen, Chem. Soc. Rev. 2016, 45, 5821-5833.
  3. J. J. De Yoreo, P. U. P. A. Gilbert, N. A. J. M. Sommerdijk, R. L. Penn, S. Whitelam, D. Joester, H. Zhang, J. D.Rimer, A. Navrotsky, J. F. Banfield, A. F. Wallace, F. M. Michel, F. C.Meldrum, H. Cölfen, P. M. Dove, Science 2015, 349
  4. L. Bergström, E. V. Sturm, G.Salazar-Alvarez, H. Cölfen, Acc. Chem.Res. 2015, 48, 1391-1402. 
  5. P. Simon, E. Rosseeva, I. A. Baburin, L. Liebscher, S. G. Hickey, R. Cardoso-Gil, A. Eychmuller, R. Kniep, W.Carrillo-Cabrera, Angew. Chem. Int. Ed.Engl. 2012, 51, 10776-10781.
  6. J. Brunner, I. A. Baburin, S. Sturm,K. Kvashnina, A. Rossberg, T. Pietsch, S. Andreev, E. Sturm, H. Colfen, Advanced Materials Interfaces 2017, 4.

Jennifer Knaus

Ph.D Student

Contact

Phone: +49 7531  88-2002

Room: L 1053

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Responsibilities

Education:

2013
Master thesis at the research group of Prof. Dr. Helmut Cölfen, University of Konstanz, Germany, “Functionalization of PEEK Implant Surface”

2010 - 2012
Master course in LifeScience, University of Konstanz, Germany

2010
Bachelor thesis at the research group of Prof. Dr. Jörg S. Hartig, University of Konstanz, Germany, “Development of artificial, Biotin-dependent Riboswitches”

2007 - 2010
Bachelor course in LifeScience, University of Konstanz, Germany

Julian Konsek

Ph.D Student

Contact

Phone: +49 7531  88-5462

Room: L 1052

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Cathrin Kronenbitter

Ph.D Student

Contact

Phone: +49 7531  88-4808

Room: L 1051

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Responsibilities

Education

12/2018 - present
University of Constance, Ph. D. candidacy, Department of Chemistry
Workgroup: Prof. Dr. Helmut Cölfen (Physical Chemistry)

09/2018 - 11/2018
University of Constance: Scientific co-worker: “Synthesis and functionalization of anisotropic particles to control critical Casimir forces“
Workgroup: Prof. Dr. Clemens Bechinger (Physics)

07/2018
University of Constance: Master of Science Thesis: “Perylene superstructure formation through polymer induced phase-transfer experiment“
Workgroup: Prof. Dr. Helmut Cölfen (Physical Chemistry)

04/2016 - 10/2017
University of Constance: Master Courses in Chemistry

03/2016
University of Constance: Bachelor of Science Thesis: “Synthesis of polyurethanes based on long-chain aliphatic diisocyanates“
Workgroup: Prof. Dr. Stefan Mecking (Material Science)

10/2012 - 03/2016
University of Constance: Bachelor Courses in Chemistry

Research Interests

  • Synthesis of stimuli-responsive block copolymers.
  • Synthesis and analysis of nanoparticles.
  • Functionalization and stabilization of nanoparticles with switchable polymers.
  • Synthesis and analysis of switchable nanoparticle superstructures.


Michaela Köst

Secretary

Contact

Phone: +49 7531  88-2027

Room: L 1002

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Britta Maier

Master Student

Contact

Phone: +49 7531  88-4453

Room: L 1049

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Christoph Penalver

Ph.D Student

Contact

Phone: +49 7531  88-4808

Room: L 1051

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Responsibilities

Education:

09/2016
University of Konstanz: PhD candidacy in the group of Prof. Dr. Helmut Cölfen, Department of Chemistry

07/2016 – 08/2016
Internship: MacDermid Enthone Industrial Solutions

09/2015 – 05/2016
Master thesis in the group of Prof. Dr. Helmut Cölfen: „Adaptive Blockcopolymere als Stabilisatoren für kolloidale Systeme“

10/2013 – 06/2016
University of Konstanz Master of Science, Department of Chemistry

07/2013 – 10/2013
Bachelor thesis in the group of Prof. Dr. Helmut Cölfen: „Wechselwirkung von Nanopartikeln und Proteinen untersucht mit Analytischer Ultrazentrifugation “

10/2010 – 10/2013
University of Konstanz: Bachelor of Science, Department of Chemistry 

Research interests:

“Formation of mesocrystals”

Rose Rosenberg

Technical Support

Contact

Phone: +49 7531  88-2019

Room: L 1050

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Cornelia Schneider, MSc

Ph.D Student

Contact

Phone: +49 7531  88-2001

Room: L 1050

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Responsibilities

Education:

04/2015 – present
University of Constance: Ph. D. candidacy in Physical Chemistry

04/2015
University of Constance: Master of Science Thesis: „Investigation of the nucleation of nanoparticles in the Analytical Ultracentrifuge“ Workgroup: Prof. Dr. Helmut Cölfen

04/2014 – 05/2014
The University of Texas Health Science Center at San Antonio: Internship Department of Biochemistry

10/2012 – 03/2014
University of Constance: Master Courses in Chemistry

09/2012 University of Constance: Bachelor of Science Thesis: „Global analysis“ Workgroup: Prof. Dr. Helmut Cölfen

10/2009 – 09/2012
University of Constance: Bachelor Courses in Chemistry

Publication:

High-resolution insights into the early stages of silver nucleation and growth, Faraday Discuss. 2015;179:59-77. doi: 10.1039/c4fd00269e

Research Interests:

„Analysis of clusters and particles from the prenucleation stage to the final crystal“

David Schupp

Ph.D Student

Contact

Phone: +49 7531  88-5462

Room: L 1052

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Responsibilities

Education:

Since 6/2017
University of Konstanz, Germany 
PhD Student in Helmut Cölfen’s group

10/2014-2/2017
University of Konstanz, Germany
Master Studies in Chemistry

10/2011-9/2014
University of Konstanz, Germany
Bachelor Studies in Chemistry

Research Interest:

A promising strategy to a defined production and structuration of matter on the mesoscale is provided by the bottom up approach. A controlled self-assembly process, like Oriented Attachment, offers the possibility to generate multi-particle devices and coupling between nanoparticles (NPs) from the nano to micro or macroscale. In the Oriented Attachment (OA) process nano crystals are initially crystallographically aligned. The system gains energy by subsequent crystallographic fusion leading to a single crystalline dimeric nanocrystal.

My current research is focused on the kinetics of Oriented Attachment and Oriented Assembly of Gold-Nanoparticles. For this purpose, the usage of live (in-situ) analysis techniques like UV-Vis spectroscopy, light microscopy and neutrons radiation techniques (SAXS, WAXS) accompanied by TEM, HRTEM and SEM for characterization of the NPs and formed NP-structures are essential. Understanding of the mechanism, kinetics and thermodynamics will provide access to controlled anisotropic assembly of NPs in solution.

Andreas Spinnrock, MSc

Ph.D Student

Contact

Phone: +49 7531  88-4808

Room: L 1051

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Responsibilities

Education

09/2015 – today
University of Konstanz:   Ph. D. candidacy (fast track) in Physical Chemistry/Material Chemistry Carl Zeiss Scholarship

04/2015 – 07/2015
Evonik Industries, Darmstadt Internship in Research and Development

10/2013 – 03/2016
University of Konstanz: Master of Science, Department of Chemistry Major subject: Physical chemistry

10/2010 – 11/2013
University of Konstanz: Bachelor of Science, Department of Chemistry Bachelor’s thesis: “Synthesis of mesoporous silica nanoparticles by gas phase synthesis and their colloidal stabilization“
Workgroup: Prof. Dr. Sebastian Polarz

Research interests

My research deals with the controlled preparation of polymer gradient materials in ultracentrifugal fields.  Polymer gradient materials are a unique class of functional materials. Their continuous spatial gradient of composition or structure leads to diverse physical property profiles. Thus, these materials have a remarkable potential for applications in coatings, optics, electronics, sensors, and the automotive industry. Analytical Ultracentrifugation allows the detection of the forming gradients at any time. Moreover, the gradients can be simulated in advance. Therefore, this new technique allows fabrication of tailored materials with desired physical property gradients. 

A special class of polymer gradient materials are nanoparticle gradient materials. They combine the macroscopic properties of a polymer material with a spatial concentration gradient of nanoparticles. Therefore, the specific properties of nanoparticles are transferred to macroscopic materials. In my research project, I produce nanoparticle gradient materials in a controlled way by means of sedimentation and diffusion and simulate the gradients in advance. Additionally, I am interested in controlled polymerization to produce tailored molar mass distributions. Analytical Ultracentrifugation is used to do this by adjusting the concentration gradient of a macromolecular initiator. Subsequent photopolymerization leads to a defined shape of the resulting molar mass distribution.

Eduard Wiedenbeck

Ph.D Student

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Phone: +49 7531  88-5462

Room: L 1052

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Responsibilities

Education:

04/2015 – Present
University of Constance:  Ph. D. candidacy in Physical Chemistry

10/2012 – 03/2015
University of Constance: Master of Science

10/2009 – 09/2012
University of Constance: Bachelor of Science in Chemistry

Research Interests:

"Liquid Precursors of organic molecules in Non-Classical Crystallization"

Wenhan Zhang

Master Student

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