Laser-induzierte schnelle thermische Desorption von Festkörper-Oberflächen / Rapid Laser Beam Induced Thermal Desorption from Solid Surfaces

1972 ◽  
Vol 27 (11) ◽  
pp. 1607-1610 ◽  
Author(s):  
G. Ertl ◽  
M. Neumann
Keyword(s):  
Laser Power ◽  
Laser Light ◽  
Surface Region ◽  
Rapid Decrease ◽  
Solid Surfaces ◽  
Base Temperature ◽  
Relaxation Methods ◽  
Kinetics Of Adsorption ◽  
Adsorption Desorption ◽  
Kinetics Of

Abstract Absorption of a pulse of laser light in the surface region of a solid causes a fast temperature increase, followed, after the end of the laser pulse, by a rapid decrease to the base temperature. Experiments with a Nd laser (power 105 - 106 W/cm2, half width of the pulse 150 μsec) showed that desorption of CO from a Pd surface reaches its maximum rate within the time constant of the system ( ~ 0.5 msec). This effect can be used for example to investigate the kinetics of adsorption /desorption processes by means of relaxation methods.

scholarly journals Correction: Barrier kinetics of adsorption–desorption of alcohol monolayers on water under constant surface tension

Soft Matter ◽  
2019 ◽  
Vol 15 (8) ◽  
pp. 1890-1890 ◽  
Author(s):  
Ivan L. Minkov ◽  
Dimitrinka Arabadzhieva ◽  
Ibrahim E. Salama ◽  
Elena Mileva ◽  
Radomir I. Slavchov
Keyword(s):  
Surface Tension ◽  
Soft Matter ◽  
Kinetics Of Adsorption ◽  
Adsorption Desorption ◽  
Alcohol Monolayers ◽  
Kinetics Of

Correction for ‘Barrier kinetics of adsorption–desorption of alcohol monolayers on water under constant surface tension’ by Ivan L. Minkov et al., Soft Matter, 2019, DOI: 10.1039/c8sm02076k.

scholarly journals Surfactant adsorption kinetics in microfluidics

2016 ◽  
Vol 113 (41) ◽  
pp. 11465-11470 ◽  
Author(s):  
Birte Riechers ◽  
Florine Maes ◽  
Elias Akoury ◽  
Benoît Semin ◽  
Philipp Gruner ◽  
...  
Keyword(s):  
Nonionic Surfactants ◽  
Adsorption Process ◽  
Surfactant Adsorption ◽  
Kinetic Measurement ◽  
Small Droplet ◽  
Kinetics Of Adsorption ◽  
Droplet Flow ◽  
Surfactant Interactions ◽  
Adsorption Desorption ◽  
Kinetics Of

Emulsions are metastable dispersions. Their lifetimes are directly related to the dynamics of surfactants. We design a microfluidic method to measure the kinetics of adsorption of surfactants to the droplet interface, a key process involved in foaming, emulsification, and droplet coarsening. The method is based on the pH decay in the droplet as a direct measurement of the adsorption of a carboxylic acid surfactant to the interface. From the kinetic measurement of the bulk equilibration of the pH, we fully determine the adsorption process of the surfactant. The small droplet size and the convection during the droplet flow ensure that the transport of surfactant through the bulk is not limiting the kinetics of adsorption. To validate our measurements, we show that the adsorption process determines the timescale required to stabilize droplets against coalescence, and we show that the interface should be covered at more than 90% to prevent coalescence. We therefore quantitatively link the process of adsorption/desorption, the stabilization of emulsions, and the kinetics of solute partitioning—here through ion exchange—unraveling the timescales governing these processes. Our method can be further generalized to other surfactants, including nonionic surfactants, by making use of fluorophore–surfactant interactions.

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