Colloids & Rheology at Hochschule Rhein-Waal

Flashcards and summaries for Colloids & Rheology at the Hochschule Rhein-Waal

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Sol

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Properties of a colloid (Sol) 

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Electrophoresis 
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Exemplary flashcards for Colloids & Rheology at the Hochschule Rhein-Waal on StudySmarter:

Electrosmosis

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Sedimentation Potential

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Streaming potential

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Settling viscocity
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Two main mechanisms for colloid stabilization  

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Steric stabilization

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Electrostatic stabilization

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Stability of lyophobic sols
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Characterization of colloids 

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Exemplary flashcards for Colloids & Rheology at the Hochschule Rhein-Waal on StudySmarter:

Colloids & Rheology

Sol
A colloid made out of very small solid particle in a continuous liquid medium

Colloids & Rheology

Properties of a colloid (Sol) 
  • Heterogenous mixture
  • Size 1-100 nm
  • Show Tyndall effect
  • Stable => do not settle down

Colloids & Rheology

Electrophoresis 
A suspended, charged particle moves as a result of an applied electrical field

example in a gel

Colloids & Rheology

Electrosmosis
A liquid flows along a charged Surface when an electric field is applied

Colloids & Rheology

Sedimentation Potential
An electrical potential created by the movement of charged particles through a liquid by gravity

Colloids & Rheology

Streaming potential
An electric potential created when a liquid is forced to move along a charged Surface

Colloids & Rheology

Settling viscocity
Bigger particle of same density has a higher speed

Colloids & Rheology

Two main mechanisms for colloid stabilization  
Steric stabilization and electrostatic stabilization

Colloids & Rheology

Steric stabilization
Surrounding it with a protective sheath which prevent adherence due to Brownian movement

Colloids & Rheology

Electrostatic stabilization
Providing particles with electric charge

Colloids & Rheology

Stability of lyophobic sols
  • Unstable 
  • Only stabilized by electrical charges
  • The produced Repulsion prevents coagulation 
  • If more electrolytes than needed are added coagulation occurs again

Colloids & Rheology

Characterization of colloids 
Size, shape, dispersion medium, Phase of colloids, amphiphilicity

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