Publication

SPM Measurements of Hydrophobic Interactions

Alcherio Martinoli
2010
Posters

Abstract

This poster presents the measurement of the forces involved in the hydrophobic self assembly process. More precisely the objects of interest are hydrophilic semi spheres with a gold layer on the flat side. The gold layer has been coated with dodeca thiols to make the surface strongly hydrophobic. Due to the low affinityof the water molecules to the hydrophobic sites the latter will assemble together and thus minimize the thermodynamic free energy when near enough. The goal of this experiment was to measure the magnitude and the interaction distance of thiolised surfaces in DI water compared to the hydrophilic surface.

Official source

https://infoscience.epfl.ch/entities/publication/a4564436-b861-42c0-bab6-d00859ab6195

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Alcherio Martinoli
2010
Posters

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/a4564436-b861-42c0-bab6-d00859ab6195

About this result

Related concepts (32)

Thermodynamic free energy

In thermodynamics, the thermodynamic free energy is one of the state functions of a thermodynamic system (the others being internal energy, enthalpy, entropy, etc.). The change in the free energy is the maximum amount of work that the system can perform in a process at constant temperature, and its sign indicates whether the process is thermodynamically favorable or forbidden. Since free energy usually contains potential energy, it is not absolute but depends on the choice of a zero point.

Gibbs free energy

In thermodynamics, the Gibbs free energy (or Gibbs energy as the recommended name; symbol ) is a thermodynamic potential that can be used to calculate the maximum amount of work, other than pressure-volume work, that may be performed by a thermodynamically closed system at constant temperature and pressure. It also provides a necessary condition for processes such as chemical reactions that may occur under these conditions. The Gibbs free energy is expressed as where p is pressure, T is the temperature, U is the internal energy, V is volume, H is the enthalpy, and S is the entropy.

Thermodynamic equilibrium

Thermodynamic equilibrium is an axiomatic concept of thermodynamics. It is an internal state of a single thermodynamic system, or a relation between several thermodynamic systems connected by more or less permeable or impermeable walls. In thermodynamic equilibrium, there are no net macroscopic flows of matter nor of energy within a system or between systems. In a system that is in its own state of internal thermodynamic equilibrium, no macroscopic change occurs.

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SPM Measurements of Hydrophobic Interactions

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