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1-Dimensional Synthesis of Polysiloxane Nanostructures

English title 1-Dimensional Synthesis of Polysiloxane Nanostructures
Applicant Seeger Stefan
Number 159916
Funding scheme Project funding (Div. I-III)
Research institution Institut für Chemie Universität Zürich
Institution of higher education University of Zurich - ZH
Main discipline Physical Chemistry
Start/End 01.06.2015 - 31.05.2017
Approved amount 264'434.00
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Keywords (4)

nanofilaments; silicone; surface chemistry; nanotubes

Lay Summary (German)

Lead
Nanostrukturen sind Strukturen mit einer Grösse von einigen millionstel Millimetern in wenigstens zwei Dimensionen. In unserer Gruppe wurden erstmals Nanofilamente synthetisiert, die auf Oberflächen zu extrem wasser- und ölabweisenden Eigenschaften führen.
Lay summary

Das sehr einfache Verfahren basiert auf der Herstellung von Silikon, einem chemisch weitgehend inerten und ungefährlichen Material. Da auch die Herstellung sehr kostengünstig ist, gelten Silikonnanofilamente als vielversprechender Ansatz, Oberflächen in Bezug auf Wasser und Ölabweisung, sowie Selbstreinigung zu modifizieren.

Bislang ist der Mechanismus der Nanofilamentbildung weitgehend unklar. Es ist lediglich bekannt, dass eine gewisse Feuchtigkeit erforderlich ist. Auch kann man die Nanofilamente in der Gasphase und der flüssigen Phase erzeugen. Da bei beiden Prozessen praktisch gleichaussehende Filamente entstehen, liegt vermutlich ein prinzipiell gleicher Mechanismus vor.

Im Rahmen dieses Projektes sollen wesentliche Erkenntnisse gewonnen werden, um einen Synthesemechanismus der Nanofilamente vorschlagen zu können. Als analytische Methode soll insbesondere die Rasterelektronenmikroskopie und die Transmissionselektronenmikroskopie zum Einsatz kommen.

Im Rahmen dieses Projektes sollen wesentliche Erkenntnisse gewonnen werden, um einen Synthesemechanismus der Nanofilamente vorschlagen zu können. Als analytische Methode soll insbesondere die Rasterelektronenmikroskopie und die Transmissionselektronenmikroskopie zum Einsatz kommen.

Direct link to Lay Summary Last update: 28.05.2015

Responsible applicant and co-applicants

Employees

Publications

Publication
Directed In Situ Shaping of Complex Nano- and Microstructures during Chemical Synthesis
Artus Georg, Olveira Sandro, Patra Debabrata, Seeger Stefan (2017), Directed In Situ Shaping of Complex Nano- and Microstructures during Chemical Synthesis, in Macromolecular Rapid Communications, 38(4), 1.
Multifunctional Hybrid Porous Micro/Nanocomposite Materials
Chu Zonglin, Seeger Stefan (2015), Multifunctional Hybrid Porous Micro/Nanocomposite Materials, in Advanced Materials, 27(47), 7775-7781.
Silicone Nanofilament Supported Nickel Oxide: A New Concept for Oxygen Evolution Catalysts in Water Electrolyzers
Meseck Georg R., Schmidt Thomas J., Seeger Stefan (2015), Silicone Nanofilament Supported Nickel Oxide: A New Concept for Oxygen Evolution Catalysts in Water Electrolyzers, in Advanced Materials Interfaces, 2(12), 1.
Robust superhydrophobic wood obtained by spraying silicone nanoparticles
Chu Zonglin, Seeger Stefan (2015), Robust superhydrophobic wood obtained by spraying silicone nanoparticles, in RSC Advances, 5(28), 21999-22004.

Collaboration

Group / person Country
Types of collaboration
Prof. Dr. Kazuhiko Ishihara, Center for NanoBio Integration, University of Tokyo Japan (Asia)
- in-depth/constructive exchanges on approaches, methods or results
Prof. Dr. Nicholas Spencer, Professur für Oberflächentechnik, ETH Zürich Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
PD Dr. Laurent Bigler, Institut für Chemie, Universität Zürich Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
Prof. Dr. Jürg Osterwalder, Physik Institut, Universität Zürich Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
2017 MRS Spring Meeting - Symposium SM8: Advanced Polymers Talk given at a conference Chemical Shaping: Synthesizing Complex Polymeric Nano and Microstructures 17.04.2017 Phoenix, United States of America Seeger Stefan;
XIII International Conference on Nanostructured Materials Poster Silicone Nanostructures for Antibacterial Surfaces 07.08.2016 Québec, Canada Meier Margrith;
13th International Conference on Nanosciences & Nanotechnologies (NN16) Poster Silicone Nanofilaments as Support Material for Biomimetic Growth of Hydroxyapatite 05.07.2016 Thessaloniki, Greece Saddiqi Naeem-ul-Hasan;
Swiss NanoConvention Poster Antimicrobial Surfaces Based on Silicone Nanostructures 30.06.2016 Basel, Switzerland Meier Margrith;
2016 TechConnect World Innovtion Talk given at a conference From Nanostructures Made of Silicone to Multifunctional Hybrid Materials 23.05.2016 Maryland, United States of America Seeger Stefan;
Max-Planck-Institute of Polymer Research Individual talk Supercritical Angle Fluorescence Microscopy and Silicone Nanofilaments: Analysis and Chemical Synthesis in the Nanoworld 18.04.2016 Mainz, Germany Seeger Stefan;
German Chemical Society Talk given at a conference Entrepeneurship Education in Chemistry Programs at Universities: How does it work 21.03.2016 Frankfurt, Germany Seeger Stefan;
BIT's 2nd Annual World Congress of Smart Materials 2016 Talk given at a conference Nanostructures made from Silicone: Synthesis and Applications 03.03.2016 Singapur, Singapore Seeger Stefan;
2nd International Symposium on Bioinspired Interfacial Materials with Superwettability Talk given at a conference Silicone Nanostructures: From filaments to tubes to vessels 09.01.2016 Shanghai, China Seeger Stefan;
Empa PhD Students’ Symposium Poster Bacterial Adhesion on Nanostructured Polysiloxane Surfaces 07.12.2015 Dübendorf, Switzerland Meier Margrith;
International Symposium on Nanomedicine Molecular Science 2015 Talk given at a conference Ultrasensitive probing of protein-biomembrane interactions: Technologies and the impact on neurodegernative disease research 23.11.2015 Tokio, Japan Seeger Stefan;
EMN Bangkok Meeting 2015 Talk given at a conference Nanostructures made from Silicone: Shape, Synthesis and Applications 09.11.2015 Bangkok, Thailand Seeger Stefan;
2015 TechConnect World Innovation Talk given at a conference Nanostructures Made from Silicone: Synthesis and Applications 15.06.2015 Washington, United States of America Seeger Stefan;
SMT29 Talk given at a conference Self-Cleaning Invisible Coatings made from Silicone Nanofilaments 10.06.2015 Copenhagen, Denmark Seeger Stefan;


Associated projects

Number Title Start Funding scheme
176026 Directed in situ Shaping of Highly Complex Nanoparticles Applying the Droplet Assisted Growth and Shaping (DAGS) Approach 01.01.2018 Project funding (Div. I-III)
146421 Studies to unravel the mechanism of novel silicone 1-D nanofilaments formation 01.06.2013 Project funding (Div. I-III)

Abstract

A decade ago one-dimensional silicone nanofilaments (1D-SNF) such as fibres and wires were described by our group for the first time. Since then, the exploration of 1D-SNF has led to remarkable advancements with respect to material science and surface science. The discovery of silicone nanostructures marks a turning point in the research on the silicone material at the nanoscale.However, the mechanism of the formation of such 1-dimensional structures are still unclear. Although we could unravel the first part of the formation, i.e. the formation of the template at a substrate’s surface, the selective growth in only one direction is not understood. We were able to show that the 1D-growth does consist of two discrete steps, i.e. the initial formation of a siloxane layer at the substrate surface including a disruption of them and a subsequent elongation into filaments. We could show that the growth takes place at the tip of the filaments, however, why it is growing selectively at this site has to be clarified.In the proposed research project we will investigate the role of nanotubes which we discovered in the predecessor project. We believe that silicone nanotubes which we could also demonstrate for the first time can be a pre-stage of filament formation which can convert to “solid” filaments by polymerization. The reaction conditions at the tip of the tubes and filaments are supposed to be different from outside and favour a polycondensation reaction.Therefore we plan to investigate after unravelling the first step of silicone nanofilament formation now the second step, i.e. the elongation process performing appropriate experiments, whereupon the separation of the events at the substrate surface and the bulk are the strategic plan. In general, we will establish the initial siloxane layer at the surface which is supposed to be compact and then adapt the reaction mixture, the temperature and other relevant parameters to the need of the task to unravel the mechanism of 1D-growth. When the mechanism of this synthesis is understood it might open new ways to new structures for silicones or even other polymer materials.
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