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1. (WO2010122592) DEVICE FOR CONTROLLED DISTRIBUTION OF MICRO- OR NANO- VOLUMES OF A LIQUID BASED ON THE PIEZOELECTRIC EFFECT IN FUNCTIONALISED MATERIALS, WITHOUT USING EXTERNAL ELECTRIC SOURCES

Pub. No.:    WO/2010/122592    International Application No.:    PCT/IT2010/000172
Publication Date: Fri Oct 29 01:59:59 CEST 2010 International Filing Date: Thu Apr 22 01:59:59 CEST 2010
IPC: B01L 3/00
B05B 5/025
B05B 17/04
B05D 1/02
B41J 2/005
B81B 1/00
Applicants: CONSIGLIO NAZIONALE DELLE RICERCHE
FERRARO, Pietro
COPPOLA, Sara
VESPINI, Veronica
GRILLI, Simonetta
PATURZO, Melania
Inventors: FERRARO, Pietro
COPPOLA, Sara
VESPINI, Veronica
GRILLI, Simonetta
PATURZO, Melania
Title: DEVICE FOR CONTROLLED DISTRIBUTION OF MICRO- OR NANO- VOLUMES OF A LIQUID BASED ON THE PIEZOELECTRIC EFFECT IN FUNCTIONALISED MATERIALS, WITHOUT USING EXTERNAL ELECTRIC SOURCES
Abstract:
The invention concerns a method for the controlled distribution of pico- or nano-volumes of a liquid, comprising the step of: A. Deposing the liquid as a film or separated sessile drops on a surface of a starting substrate; the liquid being extracted and distributed on the surface of a substrate called "destination substrate", the method being characterized in that: - At least one between said starting substrate and destination substrate is a pyroelectric substrate; The method comprising the following further step: B. Varying the temperature of said pyroelectric substrate to induce a surface charge density σ such that the liquid, undergoing the electro-dynamic force, creates dispensing cones wherefrom droplets detach, which are deposed on the surface of the destination substrate, The surface of the destination substrate being set at a distance D, from the surface of the starting substrate facing it, smaller than the critical distance given by the following: Dc = (1+θ/4)V1/3 wherein 6Ms the contact angle of the dispensing cone and ^ the volume of the liquid of the same dispensing cone. The invention further concerns the relevant device for the controlled distribution of pico- or nanovolumes of liquid.