Changes in the interaction characteristics of polyelectrolyte complex covered silica surfaces

Estel, Kathrin; Kramer, Claudia; Schmitt, Franz‐Josef

doi:10.1016/s0927-7757(99)00337-4

Cited by 14 publications

(11 citation statements)

References 23 publications

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“…On a DODAB patch an electrostatic attraction was observed, indicating that the patch is positively charged. Electrostatic interactions were also mapped for polyelectrolyte complexes adsorbed to silicon wafers [468].…”

Section: Electrostatic Double-layer Force and Dlvo Theorymentioning

confidence: 99%

Force measurements with the atomic force microscope: Technique, interpretation and applications

Butt

Cappella

Kappl

2005

Surface Science Reports

3,198

2,949

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Section: Electrostatic Double-layer Force and Dlvo Theorymentioning

confidence: 99%

Force measurements with the atomic force microscope: Technique, interpretation and applications

Butt

Cappella

Kappl

2005

Surface Science Reports

3,198

2,949

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“…The surface force apparatus (SFA)14, 15 and the atomic force microscope (AFM)16 allow the effects of chemical addition to a colloid system on the colloid forces to be investigated 17–19. Direct force measurements between mica/silica/glass surfaces in various well‐prepared polyelectrolyte solutions have been carried out in numerous studies 20–33…”

Section: Introductionmentioning

confidence: 99%

Role of colloidal interactions in oil sand tailings treatment

Long

et al. 2005

AIChE Journal

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“…The occurrence of such cavities may explain the dependence of the wall permeability on environmental pH or ionic strength of the final capsule. The choice of polyions such as, for example, PDADMAC [poly‐(diallyldimethylammonium chloride)] or PEI [poly‐(ethylenimine)], which are sterically hindered and do not coil dependent upon pH or salt concentration, is another parameter that can alter the wall properties (Baba et al ., 2000; Estel et al ., 2000).…”

Section: Introductionmentioning

confidence: 99%

Encapsulated yeast cells inside Paramecium primaurelia: a model system for protection capability of polyelectrolyte shells

Krol¹,

Cavalleri²,

Ramoino

et al. 2003

Journal of Microscopy

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SummaryOne of the most promising applications of encapsulated living cells is their use as protected transplanted tissue into the human body. A suitable system for the protection of living cells is the use of nano-or microcapsules of polyelectrolytes. These shells can be deposited easily on top of the cells by means of a layer-by-layer technique. An interesting feature of the capsules is the possibility to control their properties on a nanometre level, tuning their wall texture via the preparation conditions. Here we introduce a model system to test the protection ability of polyelectrolyte capsules. Common bakery yeast cells were encapsulated. They were coated with a fluorescently labelled shell at conditions known to guarantee cell survival, and the cell interior was stained with DAPI. The protozoan Paramecium primaurelia was incubated with this double-stained living yeast and visualized by means of twophoton excitation fluorescence microscopy. Cross-sections of the dye-stained material as well as autofluorescence of the fixed protozoan allowed us to follow the digestion of the coated yeast with time. Our investigation reveals that capsules prepared under these deposition conditions are permeable to lysosomal enzymes, leading to degradation of the yeast inside the intact capsules. Our preliminary results indicate the suitability of the introduced model as a test system of this permeability.

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Changes in the interaction characteristics of polyelectrolyte complex covered silica surfaces

Cited by 14 publications

References 23 publications

Force measurements with the atomic force microscope: Technique, interpretation and applications

Force measurements with the atomic force microscope: Technique, interpretation and applications

Role of colloidal interactions in oil sand tailings treatment

Encapsulated yeast cells inside Paramecium primaurelia: a model system for protection capability of polyelectrolyte shells

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