Difference between revisions of "Diffusion"
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[[Optical Measurements of Frequency-Dependent Linear Viscoelastic Moduli of Complex Fluids]] | [[Optical Measurements of Frequency-Dependent Linear Viscoelastic Moduli of Complex Fluids]] | ||
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+ | [[Hyperbranched polyglycerols on the nanometer and micrometer scale]] | ||
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+ | [[Janus Microgels Produced from Functional Precursor Polymers]] | ||
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+ | [[Perturbation Spreading in Many-Particle Systems: A Random Walk Approach]] | ||
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+ | [[Langevin Dynamics Deciphers the Motility Pattern of Swimming Parasites]] | ||
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+ | [[Diffusion through colloidal shells under stress]] | ||
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+ | [[Dealing with mechanics: mechanisms of force transduction in cells]] | ||
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+ | [[Actin Filament Length Tunes Elasticity of Flexibly Cross-Linked Actin Networks]] | ||
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+ | [[Direct imaging of repulsive and attractive colloidal glasses]] | ||
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+ | [[Influence of Internal Capsid Pressure on Viral Infection by Phage λ]] | ||
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+ | [[Nanomechanics of vimentin intermediate filament networks]] | ||
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+ | [[Surface roughness directed self-assembly of patchy particles into colloidal micelles]] | ||
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+ | [[Origin of de-swelling and dynamics of dense ionic microgel suspensions]] |
Revision as of 02:18, 12 September 2012
Definition
A process by which molecules or particles become evenly distributed throughout a medium. The random movement of particles (see Brownian Motion) drives the diffusion of small molecules and particles in liquids and gases.
The diagram below shows two different types of molecules in two separate compartments. Once the divider is removed, both types of molecules diffuse throughout the whole container. The molecules move from areas of high concentration (of their own species) to areas of low concentration.
Applications
Dufresne, Squires, Brenner, and Grier study the diffusion of two micron-sized silica spheres in their letter, Hydrodynamic Coupling of Two Brownian Spheres to a Planar Surface. The authors study the spheres' diffusion coefficients and determine how the proximity to a flat surface affects diffusion.
If you are interested in equations describing diffusion the wikipedia page on the Diffusion Equation is a good place to start.
In the Wikimedia Commons video below, food coloring is dropped into two glasses of water. Can you figure out which glass contains hot water and which contains cold water? Click here for the answer.
References
[1] Dufresne, E. R., Squires, T. M. & Brenner, M. P. Phys. Rev. Lett. 85, 3317-3320 (2000).
[3] http://hyperphysics.phy-astr.gsu.edu/hbase/kinetic/diffus.html
[4] http://wikimediafoundation.org/wiki/File:Diffusion.gif
[5] http://wikimediafoundation.org/wiki/File:Diffusion_%281%29.png
Keyword in references:
A non equilibrium mechanism for nanobubble stabilization
Diffusion through colloidal shells under stress
Hydrodynamic Coupling of Two Brownian Spheres
The Elementary Theory of the Brownian Motion
Steering nanofibers: An integrative approach to bio-inspired fiber fabrication and assembly
Synthesis and Phase Stability in Ultra-thin Solid Electrolytes: The Case of Zirconia Thin Films
Colloidal spheres confined by liquid droplets: Geometry, physics, and physical chemistry
Design and Synthesis of Model Transparent Aqueous Colloids with Optimal Scattering Properties Dynamics of fracture in drying suspensions
The universal dynamics of cell spreading
Gravitational stability of suspensions of attractive colloidal particles
Optimal vein density in artificial and real leaves
Statistical dynamics of flowing red blood cells by morphological image processing
Flip-flop-induced relaxation of bending energy: implications for membrane remodeling
Physiological and pathological population dynamics of circulating human red blood cells
Elastohydrodynamics of wet bristles, carpets and brushes
Motility driven by macromolecular springs and ratchets
Synthetic Homeostatic Materials with Chemo-Mechano-Chemical Self-Regulation
Electric-field-induced capillary attraction between like-charged particles at liquid interfaces
Relationship between cellular response and behavioral variability in bacterial chemotaxis
Interdependence of behavioural variability and response to small stimuli in bacteria
Fine-tuning of chemotactic response in E. coli determined by high-throughput capillary assay
DNA molecules and configurations in a solid-state nanopore microscope
Detection and quantized conductance of neutral atoms near a charged carbon nanotube
Nanoscale volcanoes: Accretion of matter at ion sculpted nanopores
Recapturing and trapping single molecules with a solid-state nanopore
The force-velocity relationship for the actin-based motility of Listeria-Monocytogenes
Elastic behavior of cross-linked and bundled actin networks
Buckling of drying droplets of colloidal suspensions
Non-equilibration of hydrostatic pressure in blebbing cells
Pin-Hole Array Correlation Imaging: Highly Parallel Fluorescence Correlation Spectroscopy
Single molecule statistics and the polynucleotide unzipping transition
Grain Boundary Scars and Spherical Crystallography
Non-random-coil behavior as a consequence of extensive PPII structure in the denatured state
Minimal model for kinetic arrest
Equilibrating Nanoparticle Monolayers UsingWetting Films
Synthesis and Phase Stability in Ultra-thin Solid Electrolytes: The Case of Zirconia Thin Films
A theory of coupled diffusion and large deformation in polymeric gels
Large deformation and electrochemistry of polyelectrolyte gels
Indentation of polydimethylsiloxane submerged in organic solvents
Intracellular transport by active diffusion
Soft colloids make strong glasses
Optical Measurements of Frequency-Dependent Linear Viscoelastic Moduli of Complex Fluids
Hyperbranched polyglycerols on the nanometer and micrometer scale
Janus Microgels Produced from Functional Precursor Polymers
Perturbation Spreading in Many-Particle Systems: A Random Walk Approach
Langevin Dynamics Deciphers the Motility Pattern of Swimming Parasites
Diffusion through colloidal shells under stress
Dealing with mechanics: mechanisms of force transduction in cells
Actin Filament Length Tunes Elasticity of Flexibly Cross-Linked Actin Networks
Direct imaging of repulsive and attractive colloidal glasses
Influence of Internal Capsid Pressure on Viral Infection by Phage λ
Nanomechanics of vimentin intermediate filament networks
Surface roughness directed self-assembly of patchy particles into colloidal micelles
Origin of de-swelling and dynamics of dense ionic microgel suspensions