Termszetes nanoszerkezetek

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Természetes nanoszerkezetek

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

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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
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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
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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
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Synthesis of high-coercivity cobalt ferrite
particles usingwater-in-oil microemulsionsV.
Pillai, D.O. ShahJournal of Magnetism and
Magnetic Materials 163 (1996) 243-248
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Pd nanorészecskék elektronmikroszkópos
felvételei (a) etanol / THF / TDABr és (b) víz
/ THF / TDABr rendszerben eloállítva
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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
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