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Your search keyword '"Wojciech Lisowski"' showing total 4 results
Start Over Author "Wojciech Lisowski" Journal lab on a chip
4 results on '"Wojciech Lisowski"'

1. Polyethyleneimine coating renders polycarbonate resistant to organic solvents

Author

Dominika Ogończyk, Wojciech Lisowski, Piotr Garstecki, and Pawel Jankowski

Subjects
Materials science, Fluorinert, Biomedical Engineering, Bioengineering, Ether, General Chemistry, engineering.material, Biochemistry, Toluene, chemistry.chemical_compound, chemistry, Coating, Chemical engineering, visual_art, Polymer chemistry, engineering, visual_art.visual_art_medium, Polycarbonate, Acetonitrile, Dissolution, Tetrahydrofuran
Abstract

We propose a method for the modification of surfaces of microchannels in chips fabricated in polycarbonate (PC) that makes the devices resistant to a range of organic solvents. Coating of PC with branched polyethyleneimine (BPEI) with the use of trimethylpropane triglycidyl ether (TTE) as a linker renders the devices resistant to toluene, benzene, acetonitrile, tetrahydrofuran, dioxane and ethylene dichloride. The optimized procedure of modification allows for continuous operation of the chips for several hours without dissolution of PC. Additional modification with the use of Krytox® allows for the use of Fluorinert (FC-40) as the continuous phase and for generation and handling of droplets of organic solvents that are miscible with water.

Published
2012

2. Hydrophilic polycarbonate for generation of oil in water emulsions in microfluidic devices

Author

Wojciech Lisowski, Pawel Jankowski, Ladislav Derzsi, and Piotr Garstecki

Subjects
chemistry.chemical_classification, Materials science, Microfluidics, Biomedical Engineering, Bioengineering, General Chemistry, engineering.material, Biochemistry, Allylamine, Oil in water, chemistry.chemical_compound, Silicone, Hydrocarbon, Coating, chemistry, Chemical engineering, visual_art, engineering, visual_art.visual_art_medium, Organic chemistry, Wetting, Polycarbonate
Abstract

This report details the method for rendering hydrophilic surfaces of microchannels fabricated in polycarbonate (PC). We characterize the wetting properties and stability of the hydrophilic character of two coatings – one formed by a layer of poly(allylamine) (PAH*) and the second including an additional layer of poly(styrene-sulfonate) (PSS). This second (PC-PAH/PSS) coating yields highly hydrophilic surface that is stable against weeks of exposure to various fluids including organic oils. This coating allows for stable generation of oil-in-water emulsions of hydrocarbon, silicone and fluorinated oils without the use of surfactants and over days of continuous use.

Published
2011

3. Hydrophilic polycarbonate for generation of oil in water emulsions in microfluidic devicesElectronic supplementary information (ESI) available: See DOI: 10.1039/c0lc00438c.

Author

Ladislav Derzsi, Pawe Jankowski, Wojciech Lisowski, and Piotr Garstecki

Subjects
EMULSIONS, POLYCARBONATES, MICROFLUIDIC devices, SURFACE coatings, FLUORINATION, SURFACE active agents
Abstract

This report details the method for rendering hydrophilic surfaces of microchannels fabricated in polycarbonate (PC). We characterize the wetting properties and stability of the hydrophilic character of two coatings – one formed by a layer of poly(allylamine) (PAH*) and the second including an additional layer of poly(styrene-sulfonate) (PSS). This second (PC-PAH/PSS) coating yields highly hydrophilic surface that is stable against weeks of exposure to various fluids including organic oils. This coating allows for stable generation of oil-in-water emulsions of hydrocarbon, silicone and fluorinated oils without the use of surfactants and over days of continuous use. [ABSTRACT FROM AUTHOR]

Published
2011
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4. Hydrophobic modification of polycarbonate for reproducible and stable formation of biocompatible microparticles.

Author

Pawel Jankowski, Dominika Ogonczyk, Andrzej Kosinski, Wojciech Lisowski, and Piotr Garstecki

Subjects
HYDROPHOBIC surfaces, POLYCARBONATES, BIOMEDICAL materials, MICROFABRICATION, MICROFLUIDICS, SOLUTION (Chemistry), VISCOUS flow, NON-Newtonian fluids
Abstract

We propose a simple and effective scheme for the modification of the walls of microfluidic channels fabricated in polycarbonate (PC) after the device has been bonded. The method prevents both static and dynamic wetting of PC by aqueous solutions including viscous, non-Newtonian solutions of polymers as e.g.alginate. The procedure uses dodecylamine, which readily reacts with the carbonate groups of PC to produce a hydrophobic surface. We characterize the dependence of the contact angles and homogeneity of the modified surfaces on the time, temperature, and concentration—all important parameters—of the reaction and provide optimal conditions for the process. [ABSTRACT FROM AUTHOR]

Published
2011
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