DROPLET PREPARATION AND SIZE CONTROL DEVICE BASED ON ELECTROWETTING STEP EMULSIFICATION
First Claim
1. A droplet preparation and size control device based on electrowetting step emulsification, comprising:
- a syringe pump (1), a metal pipeline (3), a micro-channel (4), two electrode plates (5), a continuous phase container (6) and a direct-current power supply (7), wherein;
the syringe pump (1), the metal pipeline (3) and the micro-channel (4) are successively connected;
an outlet of the micro-channel (4) is clamped and sealed between the two electrode plates (5);
each electrode plate (5) consists of four layers, respectively a base layer, a conducting layer, an insulating layer and a hydrophobic layer;
a cathode of the direct-current power supply (7) is connected with the metal pipeline (3), and an anode of the direct-current power supply (7) is connected with the conducting layer of each electrode plate (5);
the syringe pump (1) is filled with dispersed phase fluid;
continuous phase fluid is injected into the continuous phase container (6) and immerses the electrode plates (5);
the syringe pump (1) is pulled, so that droplets are generated at lower parts of the electrode plates (5);
then the direct-current power supply (7) is switched on, so as to enable the dispersed phase fluid in the micro-channel (4) to be negatively charged;
the two electrode plates (5) are positively charged and form a capacitor;
when a flow of the syringe pump (1) changes, sizes of the droplets are adjusted through adjusting a voltage of the direct-current power supply (7), so as to stably obtain the droplets with a specified diameter;
the dispersed phase fluid is a conducting solution, and the continuous phase fluid comprises components of silicone oil and surfactant.
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Abstract
A droplet preparation and size control device based on electrowetting step emulsification is provided, including a syringe pump, a metal pipeline, a micro-channel, two electrode plates, a continuous phase container and a direct-current power supply, wherein: the syringe pump, the metal pipeline and the micro-channel are successively connected; an outlet of the micro-channel is clamped and sealed between the two electrode plates; each electrode plate consists of four layers, respectively a base layer, a conducting layer, an insulating layer and a hydrophobic layer; a cathode of the direct-current power supply is connected with the metal pipeline, and an anode of the direct-current power supply is connected with the conducting layer of each electrode plate; the syringe pump is filled with dispersed phase fluid; continuous phase fluid is injected into the continuous phase container and immerses the electrode plates. The present invention can adjust a supply voltage under a constant flow, so as to change sizes of droplets through changing a contact angle, and can also adjust the voltage under a flow fluctuation situation, so as to stabilize generation of the micro-droplets, thereby preparing the ultra-uniform micro-droplets. The ultra-uniform micro-droplets have important application prospects in fields of chemical engineering, pharmaceuticals, biomedicine and biochemistry.
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6 Claims
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1. A droplet preparation and size control device based on electrowetting step emulsification, comprising:
- a syringe pump (1), a metal pipeline (3), a micro-channel (4), two electrode plates (5), a continuous phase container (6) and a direct-current power supply (7), wherein;
the syringe pump (1), the metal pipeline (3) and the micro-channel (4) are successively connected;
an outlet of the micro-channel (4) is clamped and sealed between the two electrode plates (5);each electrode plate (5) consists of four layers, respectively a base layer, a conducting layer, an insulating layer and a hydrophobic layer;
a cathode of the direct-current power supply (7) is connected with the metal pipeline (3), and an anode of the direct-current power supply (7) is connected with the conducting layer of each electrode plate (5);
the syringe pump (1) is filled with dispersed phase fluid;continuous phase fluid is injected into the continuous phase container (6) and immerses the electrode plates (5);
the syringe pump (1) is pulled, so that droplets are generated at lower parts of the electrode plates (5);
then the direct-current power supply (7) is switched on, so as to enable the dispersed phase fluid in the micro-channel (4) to be negatively charged;
the two electrode plates (5) are positively charged and form a capacitor;
when a flow of the syringe pump (1) changes, sizes of the droplets are adjusted through adjusting a voltage of the direct-current power supply (7), so as to stably obtain the droplets with a specified diameter;
the dispersed phase fluid is a conducting solution, and the continuous phase fluid comprises components of silicone oil and surfactant. - View Dependent Claims (2, 3, 5, 6)
- a syringe pump (1), a metal pipeline (3), a micro-channel (4), two electrode plates (5), a continuous phase container (6) and a direct-current power supply (7), wherein;
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4. (canceled)
Specification