Beeinflussung von Grenzflächenphänomenen durch Adsorptionsvorgänge

Jacobasch, H.‐J.; Weidenhammer, P.

doi:10.1002/cite.330681213

Cited by 5 publications

(1 citation statement)

References 6 publications

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“…(NB this phenomenon, on the other hand, may be utilized to design microfluidic mixers [24,25].) Any (un)specific adsorption of ionic species, e.g., during the elution of a sample plug of finite length with a chemical composition different from that of the running mobile phase, will change (eventually significantly) the local charge equilibrium and associated interfacial electrokinetics [26][27][28][29][30][31][32][33][34][35][36][37][38]. This issue is further complicated when the analyte molecules and surface groups (relevant for EOF) are involved in pH-dependent equilibria.…”

Section: Introductionmentioning

confidence: 99%

Mathematical modelling of adsorption and transport processes in capillary electrochromatography: Open‐tubular geometry

et al. 2003

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A mathematical modelling approach for open-tubular capillary electrochromatography is presented. The spatially one-dimensional model takes into account (i) a coupling of (non)linear adsorption of positively or negatively charged analyte molecules (at a negatively charged capillary inner surface) with the equilibrium electrokinetics at this solid-liquid interface, (ii) mobile phase transport by electroosmosis and pressure-driven flow, as well as (iii) transport of species by electrophoresis and molecular diffusion. Under these conditions the local zeta-potential and electroosmotic mobility become a function of the concentration of the charged analyte. The resulting inhomogeneity of electroosmotic flow through the capillary produces a compensating pore pressure as requirement for incompressible mobile phase flow (i.e., for constant volumetric flow along the capillary). The results of the simulations are discussed in view of the surface-to-volume ratio of the capillary lumen, the analyte concentration (in combination with a Langmuir isotherm for the adsorption process), and buffer effects.

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Section: Introductionmentioning

confidence: 99%

Mathematical modelling of adsorption and transport processes in capillary electrochromatography: Open‐tubular geometry

et al. 2003

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Filtration

Gösele¹,

Alt²

2000

Ullmann's Encyclopedia of Industrial Chemistry

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Filtration, 1. Fundamentals

Ripperger¹,

Gösele²,

Alt³

2009

Ullmann's Encyclopedia of Industrial Chemistry

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The article contains sections titled: 1. Terminology 2. Filtration Models 2.1. Calculation of the Pressure Drop over the Filter Medium and/or the Filter Cake 2.1.1. Definition of Filter Resistance and Cake Permeability: The Darcy Equation 2.1.2. The Equation of Kozeny and Carman 2.2. Cake Filtration 2.2.1. The “Cake Filter Equation” 2.2.2. Evaluation of Experiments with Linear Diagrams 2.2.2.1. Linear Diagram in the Differential Form 2.2.2.2. Linear Diagram in Integrated Form 2.2.2.3. Example 2.2.2.4. Deviations from Linearity 2.2.3. Compressible Cake Filtration 2.3. Blocking Filtration and other Modes of Filtration 2.3.1. Complete Blocking Filtration 2.3.2. Intermediate and Standard Blocking Filtration 2.3.3. Simplified Evaluation of Experimental Data 2.4. Depth Filtration 2.4.1. Depth Filtration Mechanisms 2.4.2. Cleaning and Sizing of Deep Bed Filters 2.5. Cross‐Flow Filtration 3. Washing of Filter Cakes 3.1. Basic Effects, Mass Balances 3.2. Example of Experimental Results 3.3. Test Procedures and Pitfalls 3.4. “Intermediate” Deliquoring before Cake Washing 4. Deliquoring of Filter Cakes 4.1. Deliquoring by Gas Pressure 4.1.1. Equilibrium Saturation of Filter Cakes 4.1.2. Kinetics of Deliquoring by Gas Pressure 4.1.3. Approximate Solution for Coarse, Incompressible Cakes 4.1.4. Practical Scale‐Up of Deliquoring by Gas Pressure 4.1.5. Shrinking and Cracks in Filter Cakes 4.2. Deliquoring by Expression 5. Optimal Filtration Cycle Time 6. Interparticle Forces and Forces Between Particles and Filtermedia, DLVO Theory 7. Mathematical Simulation of Filtration and Cake Formation 8. Handling of “Unfilterable” Suspension 8.1. Optimization of Upstream Steps (Crystallization, Precipitation) 8.2. Application of Flocculants (Polyelectrolytes) 8.3. Adaptation of pH 8.4. Checking of Alternatives to Cake Filtration 8.5. Use of a Filter Aid

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Beeinflussung von Grenzflächenphänomenen durch Adsorptionsvorgänge

Cited by 5 publications

References 6 publications

Mathematical modelling of adsorption and transport processes in capillary electrochromatography: Open‐tubular geometry

Mathematical modelling of adsorption and transport processes in capillary electrochromatography: Open‐tubular geometry

Filtration

Filtration, 1. Fundamentals

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