1 / 8

Chem 5395 J. Rusling

Chem 5395 J. Rusling. “interfacial properties differ from bulk properties”. Fall 2009 Introductory Materials. Phase 1. Phase 2. Colloidal Materials dimensions ~1 nm to 1  m. spheres. nanoparticles. proteins. rods. DNA. 2 nm. TEM of 5 nm AuNPs. (A). (B). Carbon Nanotubes.

fia
Télécharger la présentation

Chem 5395 J. Rusling

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Chem 5395J. Rusling “interfacial properties differ from bulk properties” Fall 2009 Introductory Materials Phase 1 Phase 2

  2. Colloidal Materials dimensions ~1 nm to 1 m spheres nanoparticles proteins rods DNA 2 nm TEM of 5 nm AuNPs

  3. (A) (B) Carbon Nanotubes Multiwall CNT Single wall (SWNT) 0.7-2 nm diameter 5-40 nm diameter

  4. Surfaces of nanoparticles can be derivatized Antibodies on AuNP surface AFM, AuNP on PDDA > 98% coverage of surface with AuNPs

  5. Water Water Oil Water Water Molecular aggregates can be particles or present complex interfaces: micelles and microemulsions: O/W Bicontinuous Detergent molecule

  6. Many practical applications of colloids/nanoparticles: • sensors, chromatography, electrophoresis • membranes, catalysis, water treatment, detergency, ceramics • adhesion, aerosols, smog, oil recovery • soaps, drugs, paints, lubricants, beer Common Factors:small particles - high surf. Area large molecules - polymers, proteins, DNA Size range between m and approaching atomic scale

  7. Colloids are classed as: Lyophobic “solvent fearing” in water, hydrophobic Lyophilic “solvent loving” in water, hydrophilic Colloidal suspension (dispersion) has continuous (solvent) And dispersed (particulate) phases Lyophilic dispersions - usually true solutions, e.g. polymer protein solution Lyophobic dispersion - 2 or more phases, see examples

More Related