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Lecture 11

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chichi's version from 2018-04-30 20:42

Section 1

Question Answer
Self assemblythe process by which nanoparticles or other discrete components spontaneously organize due to direct specific interactions and/or indirectly, through their environment
Self assembly is typically associated with..thermodynamic equilibrium, the organized structures being characterized by a minimum in the system's free energy
Example of self assemblysurfactant micelles, atomic, molecular, and colloidal, self-assmblies
Self Assembly in general can be defined as the cooperative interaction and balance between three classes of distinctive forces
Attractive forces for self assemblyVan de waals, solvation, depletion, bridging, hyrophobic, pi-pi stacking, hydrogen bond, coordination bond
Repulsive force for self assemblyElectric double-layer, solvation, hydration, steric
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Section 2

Question Answer
atomic self-assembliesBuilding units are metal atom
molecular self-assembliesbuilding units are surfactant, polymer
colloidal self-assembliesbuilding units are nanoparticle, nanotube, fullerene colloidal object
biological self-assembliesbuilding units are amino acid, lipid biopolymer
interfacial self-assembliesbuilding units are surfactant polymer, lipid
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Section 3

Question Answer
atomic self-assembled systemsepitaxial film, quantum dot
molecular self-assembled systemmicelle, bilayer microemulsion, emulsion
colloidal self-assembled systemsuspension, dispersion, sol, colloidal crystal
biological self-assembled systemDNA, RNA, protein enzyme, membrane
interfacial self-assembled systemsurface micelle, Langmuir monolayer, Langmuir-Blodgett film, self-assembled monolayer
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Section 4

Question Answer
atomic characteristicsdirectional, one-step nonhierarchical
molecular characteristicsRandom, one-step, nonhierarchical
colloidal characteristicsRandom, one-step, nonhierarchical
biological characteristicsdirectional,stepwise, hierarchical
interfacial characteristicsdirectional, one-step, nonhierarchical
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Section 5

Question Answer
Atomic nano-structured systemsnanofabricated system (2D), nanodevice
Molecular nano-structured systemsnano-structured inorganic, nanocomposite, hybrid material (organic/inorganic), porous material (micro-,meso-,macro-), nanoparticle, nanocrystal
Polymeric nano-structured systemsnano-structured inorganic, nanocomposite, hybrid material (organic/inorganic), porous material (mes-, macro-)
Colloidal nano-structured systemsPhotonic device, photovoltaic device
Biological nano-structured systemsnanofabricated system (2D, 3D), nanoparticle, nanocrystal nanodevice
Interfacial nano-structured systemsnano-structured film/multilayer, nanodevice
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Section 6

Question Answer
Static assembly(thermodynamic free energy minimum)--once formed it is stable
Dynamic assembly (kinetically formed, not necessarily thermodynamic minimum)--not necessarily stable
Forces of chemical bondingvan der Waals, hydrogen, covalent, ionic
other forcesmagnetic, electrostatic, fluidic,...)
polar/nonpolarhydrophobicity
shapeconfigurational
templatesguided self assembly
kinetic conditionse.g., diffusion limited
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Section 7

Question Answer
Formation of self-assembled monolayer (SAM) is the result of the interplay of intermolecular forces betweenthe building units and a strong building unit--solid substrate bond
Langmuir-Blodgett Filmmust control movable barrier to keep constant pressure
SAM: Self Assembled Monolayerchemisorbed molecules, stabilized by intermolecular van der Waals interaction
Nanoparticle Monolayer Formationrequires rapid evaporation, excess dodecane present, attractive interation to liq-air interface and between particles
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