Nanostrucured Soft Matter I by nyut545e2

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									   Nanostrucured Soft Matter I

                           Dr. Ezzeldin Metwalli
                    Prof. Dr. Peter Müller-Buschbaum
                               TU München



Nanostructured Soft Matter -winter 2009/2010   E. Metwalli and P. Müller-Buschbaum   P.1
                        Course outline
1.   Introduction
2.   Materials                                      Meso-scale
   2.1 Polymers
   2.2 Colloids
                                               structures determine
   2.3 Amphiphiles                              material properties
   2.4 Liquid crystals
   2.5 Biological systems
3.   Self assembly at nano scales
4.   Thin films of soft matter
5.   Technological applications




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                       1. Introduction




Nanostructured Soft Matter -winter 2009/2010   E. Metwalli and P. Müller-Buschbaum   P.3
                  First example: Latex
                                    The indians of the amozon
                                    - Collected the sap from the hevea tree
                                    - Put it on their foot
                                    - Let it dry then they have rubber boots


                                                           Cross-
                                                          -linking
                                                            in air

                                         Mild chemical action introduced a
                                            drastic properties change in
                                               mechanical properties
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                 What is soft matter?
 Polymer                                                       10 nm- 1 µ m

 Colloids                                                      10 nm- 1 µm


Amphiphil.                                                     5 nm- 100 nm


 Liquid xtal                                                   5 nm- 100nm

    Biomol.                                                    2 nm- 5 nm
Nanostructured Soft Matter -winter 2009/2010   E. Metwalli and P. Müller-Buschbaum   P.5
         What is soft matter? cont.
                              The American name:
                                  Complex fluidity




 Complexity:                                             Flexibility:
 Very large molecules                                    By self-assembly or
 such as polymers,                                       mild chem. action tend
 surfactants, colloidal                                  to build more rigid
 grains.                                                 (nano) structures.

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         What is soft matter? cont.
   Complex soft matter systems have a
       large response functions

Response functions = Molecules can held
together by weak non-covalent interactions
comparable to entropic forces.                                            de Gennes




Nanostructured Soft Matter -winter 2009/2010   E. Metwalli and P. Müller-Buschbaum    P.7
                                  Polymers

                                                                      Polymers
                                                                    > 104 g/mole

       Linear                          Crosslinked
                                                                 Macromolecule
                                                                  < 103 g/mole



                                                                   Oligomers
         Branched                         Rings               < 10 monomer units

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                                      Colloids
Colloids are complex fluids, in which small objects at nano- or micro-
      meter scale are suspended.


    a)     Air-in-liquid colloids (e.g. shaving cream,
           beer froth and aerosols);
    b)     Emulsions, which are liquid-in-liquid colloids
           (such as mayonnaise, milk and cosmetics)
    c)     Dispersions, which are solid-in-liquid colloids
           (e.g. ink, paint, green ceramics).

         Ice cream is a foam with air-bubbles in a continuous matrix of
                                   sugar and fat.



  Nanostructured Soft Matter -winter 2009/2010   E. Metwalli and P. Müller-Buschbaum   P.9
                          Liquid crystals
      LCs’ exhibit one or more mesophases upon heating or solvent
      addition




             Crystalline                Liquid                Isotropic
               Solids                  crystals                liquids
                                                      http://atom.physics.calpoly.edu
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                              Amphiphiles
                Amphiphiles = hydrophobic (water-dislike)
                              + hydrophilic (water-like)




   The molecule aligns
   itself with one part
   toward the solvent
   while the other part
   avoids contact with
   solvent.

    http://www.vcbio.science.ru.nl/

Nanostructured Soft Matter -winter 2009/2010   E. Metwalli and P. Müller-Buschbaum   P.11
                    Biological systems
         protein                                                    membrane




    Formation of structures necessary for biological function
    depends on the self-assembly at both molecular and
    supramoelcular level. Similar interactions is involved in
    soft matter.
                    http://www.ncnr.nist.gov/programs/reflect/rp/biology/cell_membrane.html
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              Length and time scale
                                                            Time (second)
                      Length (meter)                                   102
                                                                       100
                                                                       10-2     Polymer
                                                                       10-4    relaxation.




                                                            Polymers
                                                                       10-6




                                                 Colloids
                                                                       10-8    Surfactant
                                                                       10-10
                                                                               dynamics
                                                                                  Mol.
                                                                       10-12
                                                                               collusions
                                                                       10-14

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                            Text books




       2000                              2004                               2007
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