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Nanoparticles and Colloidal Materials: Interfacial Properties in Nanoscale to Micrometer Dimensions

Explore the diverse world of nanoparticles and colloidal materials, ranging from spheres to DNA rods, with focus on interfacial properties differing from bulk properties. Learn about applications in sensors, catalysis, water treatment, adhesion, and more.

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Nanoparticles and Colloidal Materials: Interfacial Properties in Nanoscale to Micrometer Dimensions

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  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

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