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Investigations in the Stranski-Laboratorium of the TU Berlin – Physical Chemistry of Colloidal Systems – Going Towards Complexity and Functionality

  • Burcu Altin , Anina Barth , Katharina Bressel , Leonardo Chiappisi , Max Dürr , Michaela Dzionara , Mahmoud Elgammal , Daniela Fliegner , Caroline Ganas , Sakshi Gupta , Gabriele Hedicke , Peggy Heunemann , Ingo Hoffmann , Rastko Joksimovic , Ravneet Kaur , Andreas Klee , Hsin-yi Liu , Jana Lutzki , Paula Malo de Molina , Martin Medebach , Raphael Michel , Michael Muthig , Viet Nguyen-Kim , Claudia Oppel , Sylvain Prévost , Jens Popig , Sven Riemer , Marcel Sperling , René Strassnick , Lin Zhang and Michael Gradzielski
Published/Copyright: March 1, 2013
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Tenside Surfactants Detergents
From the journal Tenside Surfactants Detergents Volume 49 Issue 3

Abstract

The research topics of our group are in general from the field of physical chemistry of colloidal systems. Within this rather wide layout a large variety of quite different questions and systems are tackled, where the common bridging factor is the aim of understanding the properties of colloidal systems based on their mesoscopic structure and dynamics, which in turn are controlled by their molecular composition. With such an enhanced understanding of the correlation between mesoscopic structure and the macroscopic properties the goal then is to employ this knowledge in order to formulate increasingly complex colloidal system with correspondingly more variable and interesting functionalities. From this general context of investigations, some representative systems and questions that have been studied in recent time by us are covered in this text.

They comprise the phase behaviour and the structures formed in solutions of surfactants and amphiphilic copolymers. Once these static properties are known, we also have a high interest in the dynamic properties and the kinetics of morphological transitions as they are observed under non-equilibrium conditions, since they are frequently encountered in applications. A key property of amphiphilic molecules is their ability to solubilise sparingly soluble compounds thereby forming microemulsions or nanoemulsions, where the ability to form such systems depends strongly on the molecular architecture of the amphiphiles. By turning to polymeric amphiphiles the concept of surfactants and their architecture can be extended largely towards more versatile structures, more complex self-assembly and much larger length and time scales. Another direction is the surfactant assisted formation of nanoparticles or mesoporous inorganic materials. By combining copolymers with other polymers, copolymers, colloids, or surfactants – for instance via electrostatically driven co-assembly – one may then form increasingly complex colloidal aggregates. By doing so one is able to control rheological properties or develop complex delivery systems, whose properties can be tailor-made by appropriate choice of the molecular build-up. This striving towards well controlled complexity achieved by means of self- and co-assembly then leads to increasingly more functional systems and is the key direction for future research activities in our group.

Kurzfassung

Die Forschung unseres Arbeitskreises fällt generell in das Feld der Physikalischen Chemie kolloidaler Systeme. Innerhalb dieses ziemlich breiten Gebietes werden recht unterschiedliche Fragen und Systeme betrachtet, wobei der verbindende Faktor das Verständnis kolloidaler Systeme auf der Basis ihrer mesoskopischen Struktur und Dynamik ist, welche wiederum durch ihren molekularen Aufbau bestimmt sind. Basierend auf einem grundlegenden Verständnis der Korrelation zwischen mesoskopischer Struktur und den makroskopischen Eigenschaften ist dann das Ziel, diese Kenntnisse zum Aufbau zunehmend komplexer kolloidaler Systeme mit entsprechend variabler und interessanter Funktionalität einzusetzen. Aus diesem generellen Kontext werden im Folgenden einige repräsentative Systeme und Fragestellungen herausgegriffen und hier kurz beschrieben, die in letzter Zeit von uns bearbeitet wurden.

Diese Beispiele umfassen das Phasenverhalten und die Aggregatstruktur von Tensiden und amphiphilen Copolymeren. Über dieses statische Verhalten hinaus, haben wir auch ein hohes Interesse an den dynamischen Eigenschaften und dem Ablauf morphologischer Übergänge, wie sie unter Nichtgleichgewichtsbedingungen beobachtet werden, und wie sie bei vielen Anwendungen auftreten. Eine wichtige Eigenschaft amphiphiler Moleküle ist ihre Fähigkeit schlecht lösliche Verbindungen in Lösung zu bringen, wobei sich Mikro-oder Nanoemulsionen bilden können. Die Fähigkeit solche Strukturen auszubilden hängt stark von der molekularen Architektur der Amphiphile ab. Bei polymeren Amphiphilen kann das Konzept der Tenside und ihrer Architektur maßgeblich zu variableren Strukturen hin erweitert werden, die komplexere Selbstaggregation zeigen und deutlich größere Zeit- und Längenskalen aufweisen. Eine weitere Arbeitsrichtung ist die tensidunterstützte Synthese von Nanopartikeln oder mesoporösen anorganischen Materialien. Durch die Kombination von Copolymeren mit anderen Polymeren, Copolymeren, Kolloiden oder Tensiden – z.B. durch elektrostatisch getriebenes Coassembly – kann man zunehmend komplex strukturierte kolloidale Aggregate aufbauen. Auf diese Art und Weise lassen sich z.B. die rheologischen Eigenschaften steuern oder Trägersysteme konzipieren, deren Eigenschaften über die molekulare Zusammensetzung maßgeschneidert eingestellt werden können. Dieses Streben nach kontrollierter Komplexität über die Wege der Selbstaggregation und der Coassembly führt dann zu Systemen zunehmend höherer Funktionalität und stellt die zentrale Richtung zukünftiger Forschungsaktivitäten unserer Arbeitsgruppe dar.

Key words:: Surfactants; amphiphilic copolymers; colloids and self-assembly; structural and dynamical characterisation
Stichwörter:: Tenside; amphiphile Copolymere; Kolloide und Selbstorganisation; strukturelle und dynamische Charakterisierung
1 Prof. Dr. Michael Gradzielski, Technische Universität Berlin, Stranski-Laboratorium für Physikalische Chemie und Theoretische Chemie, Institut für Chemie, Sekretariat TC 7, Strasse des 17. Juni 124, D-10623 Berlin, Germany, Tel.: (0049) 30 314 24934, Fax: (0049) 30 314 26602. E-mail:

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Received: 2012-02-02
Revised: 2012-03-01
Published Online: 2013-03-01
Published in Print: 2012-05-01

© 2012, Carl Hanser Publisher, Munich

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  1. Contents/Inhalt
  2. Contents
  3. Abstracts
  4. Abstracts
  5. 7th European Detergents Conference (EDC)
  6. Biosurfactants as Antimicrobial Ingredients for Cleaning Products and Cosmetics
  7. Scientific Results and Economic Effects from the Centre for Surfactants Based on Natural Products (SNAP)
  8. Application
  9. Preparation and Performance of Catanionic Surfactants
  10. Environmental Chemistry
  11. Acrylic Acid-Allylpolyethoxy Carboxylate Copolymer Dispersant for Calcium Carbonate and Iron(III) Hydroxide Scales in Cooling Water Systems
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  13. Lyotropic Liquid Crystals Formed in Brij35/Copolymer/Water System
  14. Physical Chemistry
  15. Micellization of Alkyl Trimethyl Ammonium Bromides in Aqueous Solutions–Part 1: Critical Micelle Concentration (CMC) and Ionization Degree
  16. Review
  17. Electrical Properties of PANI/Chalcogenide Junctions Doped with Ionic Liquids Anions
  18. Synthesis
  19. Synthesis of Quaternary Derivatives of Ortho-Coco Di-Amido Toluene and Investigation of these Compounds as Cationic Bitumen Emulsifier
  20. Synthesis and Surface Activity of Guerbet Betaine Surfactants with Ethylene Oxide Groups
  21. Research Group Portrait
  22. Investigations in the Stranski-Laboratorium of the TU Berlin – Physical Chemistry of Colloidal Systems – Going Towards Complexity and Functionality
https://doi.org/10.3139/113.110191
Keywords for this article
Surfactants; amphiphilic copolymers; colloids and self-assembly; structural and dynamical characterisation

Articles in the same Issue

  1. Contents/Inhalt
  2. Contents
  3. Abstracts
  4. Abstracts
  5. 7th European Detergents Conference (EDC)
  6. Biosurfactants as Antimicrobial Ingredients for Cleaning Products and Cosmetics
  7. Scientific Results and Economic Effects from the Centre for Surfactants Based on Natural Products (SNAP)
  8. Application
  9. Preparation and Performance of Catanionic Surfactants
  10. Environmental Chemistry
  11. Acrylic Acid-Allylpolyethoxy Carboxylate Copolymer Dispersant for Calcium Carbonate and Iron(III) Hydroxide Scales in Cooling Water Systems
  12. Novel Surfactants
  13. Lyotropic Liquid Crystals Formed in Brij35/Copolymer/Water System
  14. Physical Chemistry
  15. Micellization of Alkyl Trimethyl Ammonium Bromides in Aqueous Solutions–Part 1: Critical Micelle Concentration (CMC) and Ionization Degree
  16. Review
  17. Electrical Properties of PANI/Chalcogenide Junctions Doped with Ionic Liquids Anions
  18. Synthesis
  19. Synthesis of Quaternary Derivatives of Ortho-Coco Di-Amido Toluene and Investigation of these Compounds as Cationic Bitumen Emulsifier
  20. Synthesis and Surface Activity of Guerbet Betaine Surfactants with Ethylene Oxide Groups
  21. Research Group Portrait
  22. Investigations in the Stranski-Laboratorium of the TU Berlin – Physical Chemistry of Colloidal Systems – Going Towards Complexity and Functionality
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