Termszetes nanoszerkezetek - PowerPoint PPT Presentation

Title: Termszetes nanoszerkezetek


1
Természetes nanoszerkezetek

• Szilikátok
• Fém-oxidok
• Természetes polimerek poliszaharidok, keményito
  , cellulóz
• Biológiailag aktiv anyagok
• - fehérjék (proteinek, oligopeptidek
• - DNS, RNS

2
Surfactant aggregates in solution
Surfactant molecule
Oils and water do not mix! Why? Water is a polar
liquid, ? 81 Oils are non polar, ? 2 (? -
dielectric const.)
Hydrophilic head SO3-Na NH3Cl- -(OCH2CH2)n-
Hydrophobic tail CH3-CH2-CH2- CF3-CF2-CF2-

• When surfactants are dissolved in water they
• - reduce the surface tension because they are
  adsorbed on the surfaces
• form variety of aggregates micelles, lamellae,
  bicelles, vesicles, etc

Spherical micelles
Cylindrical micelles
Lamellae
Vesicles
Surfactant
H2O
micelles are small, 4 nm in diameter
H2O
3
Micellar properties
Oils and water do not mix?!? The surfactants help
them mix.
Microemulsion droplet
oil
Micelle
H2O
Surfactant
microemulsion droplets are bigger, dia. 4 - 50 nm
Solubilized organic molecules (oil)
H2O
Surfactant
When surfactants are dissolved in oils they form
inverse micelles, lamellae, etc
Inverse microemulsion droplet
Inverse micelle
H2O
Surfactant
n-decane C10H22
n-decane C10H22
Surfactant
4
(No Transcript)
5
(No Transcript)
6
(No Transcript)
7
(No Transcript)
8
Adsorption and Interaction Forces of Micellar
and Microemulsion Solutions in Ultrathin
Films Suzanne Giasson, Tonya L. Kuhl, and Jacob
N. Israelachvili 891 Langmuir 1998, 14, 891-898
9
Synthesis of high-coercivity cobalt ferrite
particles usingwater-in-oil microemulsionsV.
Pillai, D.O. ShahJournal of Magnetism and
Magnetic Materials 163 (1996) 243-248
10
(No Transcript)
11
Pd nanorészecskék elektronmikroszkópos
felvételei (a) etanol / THF / TDABr és (b) víz
/ THF / TDABr rendszerben eloállítva
12
Microemulsion-Templated Synthesis of Carbon
Nanotube-Supported Pd and Rh Nanoparticles for
Catalytic Applications Byunghoon Yoon and Chien
M. Wai Published on Web 11/16/2005
13
(No Transcript)
14
(No Transcript)
15
(No Transcript)
16
(No Transcript)
17
(No Transcript)
18
(No Transcript)
19
(No Transcript)
20
(No Transcript)
21
(No Transcript)
22
(No Transcript)