CN106669870A - Coffee-ring effect-based electric wetting device for surface modification and modification method - Google Patents
Coffee-ring effect-based electric wetting device for surface modification and modification method Download PDFInfo
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- CN106669870A CN106669870A CN201611177682.9A CN201611177682A CN106669870A CN 106669870 A CN106669870 A CN 106669870A CN 201611177682 A CN201611177682 A CN 201611177682A CN 106669870 A CN106669870 A CN 106669870A
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- Prior art keywords
- electrode
- modification
- drop
- surface modification
- carries out
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
- B01L3/50—Containers for the purpose of retaining a material to be analysed, e.g. test tubes
- B01L3/502—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures
- B01L3/5027—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures by integrated microfluidic structures, i.e. dimensions of channels and chambers are such that surface tension forces are important, e.g. lab-on-a-chip
- B01L3/50273—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures by integrated microfluidic structures, i.e. dimensions of channels and chambers are such that surface tension forces are important, e.g. lab-on-a-chip characterised by the means or forces applied to move the fluids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2300/00—Additional constructional details
- B01L2300/06—Auxiliary integrated devices, integrated components
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2300/00—Additional constructional details
- B01L2300/08—Geometry, shape and general structure
- B01L2300/0887—Laminated structure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2400/00—Moving or stopping fluids
- B01L2400/04—Moving fluids with specific forces or mechanical means
- B01L2400/0403—Moving fluids with specific forces or mechanical means specific forces
- B01L2400/0415—Moving fluids with specific forces or mechanical means specific forces electrical forces, e.g. electrokinetic
- B01L2400/0427—Electrowetting
Abstract
The invention discloses a coffee-ring effect-based electric wetting device for surface modification and a modification method. The electric wetting device comprises a lower polar plate, wherein the lower polar plate consists of a substrate, an electrode layer, a medium layer and a drainage layer which are successively arranged from bottom to top; liquid droplets containing a modification substance is arranged on the drainage layer; the electrode layer comprises a plurality of transport electrodes and a plurality of modification electrodes, and every two electrodes are electrically isolated; the transport electrodes define a liquid droplet input path; and the modification electrodes are formed by a plurality of annular electrodes which are distributed from inside to outside, and a center position and an edge position of the liquid droplet can be determined based on an electric wetting effect by virtue of the modification electrodes. By controlling the transport and evaporation process of the liquid droplets, different substances are modified on different positions of the surface of the modification electrode. The modification method has the characteristics of novel design, simplicity in control, high automation degree and the like, and greatly enlarges the application range of techniques such as digital microfluidics and on-site rapid detection, and the like.
Description
Technical field
The invention belongs to digital microfluidic technical field, be related to microflow control technique based on electrowetting principle on dielectric layer and
A kind of evaporation process of liquid, and in particular to surface modification device for Electrowetting device on dielectric layer based on coffee toroidal effect
Part and method of modifying.
Background technology
Chip lab can simply be defined as that each process of biochemistry treatment can be completed, can be automatically performed tradition in fact
Test the microminiaturization of room function, integrated microelectromechanical systems, its target be it is integrated on individual devices completely analyze process,
There is high integration, high accuracy, low consumption, intellectuality, many fields such as biology, chemistry have it is extraordinary before
Scape.
Used as the power section of chip lab, microflow control technique plays an important role.Electrowetting on dielectric technology passes through
Voltage changes wettability of the drop in dielectric surface to manipulate to drop, with type of drive is simple, driving force strong, from
Many advantages, such as dynamicization degree is high, but there is the low deficiency of single function, integrated level.Meanwhile, Electrowetting device table on dielectric layer
Face covers one layer of more fragile hydrophobic layer, thus is difficult to modify its surface, significantly limit it in portable equipment
And the application in the field such as chip lab.Therefore finding the method for the digital microcurrent-controlled chip surface of modification has extremely important meaning
Justice.
The content of the invention
It is an object of the invention to provide one kind can precisely modify Electrowetting device ad-hoc location surface on dielectric layer, together
When again can be mutually compatible with existing microflow control technique digital microcurrent-controlled chip method, and then improving existing digital microcurrent-controlled device
Expand the range of application of digital microfluidic technology on the basis of part.
To reach above-mentioned purpose, the invention provides a kind of energy carries out the electrowetting device of surface modification based on coffee toroidal effect
Part, the Electrowetting device is included：Bottom crown, the bottom crown is set successively from top to bottom by substrate, electrode layer, dielectric layer, hydrophobic layer
Put composition；Wherein, the drop comprising modification material is placed on hydrophobic layer；Electrode layer transports electrode and some modifications comprising some
Electrode, electrode electrical isolation between any two；Described transports electrode definition drop afferent pathway；Described modified electrode is by from interior
And some ring electrodes being distributed outward are constituted, the centre bit of described drop can determine that by modified electrode based on electrowetting effect
Put and marginal position.
Described drive electrode and modified electrode is plane electrode.
Described drive electrode and the upper and lower surface of modified electrode is respectively at same plane.
Described modified electrode is made up of the ring electrode for wrapping up successively from inside to outside, so as to the edge of drop can be from interior
The edge of outside each ring electrode that coincide successively.
The material of described substrate is insulant.
Described dielectric layer material selects the non-conductive material with certain dielectric constant with breakdown characteristics, preferred dielectric
Constant height and the strong material of breakdown characteristics, including but not limited to cycloaliphatic epoxy resin CEP, SU-8, tantalum pentoxide etc..
The material of described hydrophobic layer is selected to reduce the material of Surface Tension of Liquid Drops, including but not limited to Teflon
Teflon, fluororesin Cytop etc..
Present invention also offers a kind of Electrowetting device for carrying out surface modification based on coffee toroidal effect using above-mentioned energy
Drop containing modification material is transported to modified electrode center by the method for carrying out surface modification, the method by electrode is transported, and is led to
The form (based on electrowetting effect) for crossing control drop determines modification position, subsequently makes modification material in drop by evaporation process
It is deposited on drop edge position.The method is specifically included：
Step 1, to drive electrode applied voltage, modified electrode is transported to by the drop containing modification material by electrode is transported
Center；
Step 2, to modified electrode applied voltage, controls the form of above-mentioned drop to determine modification position；
Step 3, makes modification material in drop be deposited on drop edge position by evaporation process, realizes surface modification, should
The realization of surface modification depends on the coffee toroidal effect during droplet evaporation.
Preferably, in step 2, from the corresponding electrode in the center of modified electrode to the corresponding electrode in position to be finished,
Applied voltage successively from inside to outside, the border for making drop is fixed on position to be finished.
Preferably, in step 3, in evaporation process, modification position counter electrode applied voltage is maintained at, until drop steams
The process of sending out terminates or driven electrode is transported and left.
The drive electrode, the shape of modified electrode, size and its relative position not considered critical, to realize its work(
Can be design criteria, but modified electrode size should ensure that under conditions of it can realize function can be by big in the device scope of application
Little drop is covered under electrowetting effect, to realize that drop can be transported and be modified the purpose of surface optional position.
" drop comprising modification material " refer to can be used on dielectric layer electrowetting drive and its solute for need by
The drop of the material in device surface is modified, its composition is not limited, and can be single biological sample, or multicomponent
Composition；Simultaneously its size is not also limited, it is contemplated that the restriction of drop driving structure is preferably picoliters between some milliliters.
Coffee toroidal effect of the present invention referred in evaporation process, the work of the solute of liquid internal in its interior flow field
Its edge is deposited on under.The present invention is based on electrowetting principle on dielectric layer and coffee toroidal effect, it is proposed that one kind will
The completely new approach of digital microcurrent-controlled chip surface is modified using the coffee toroidal effect in liquor evaporation processes, by the way that modification will be included
The liquid drop boundary of material is fixed on after modified electrode diverse location and is evaporated so that modification material therein is deposited on boundary bit
Put.
The surface modification method based on electrowetting principle and coffee toroidal effect on dielectric layer that the present invention is provided has as follows
Advantage：
A) modified electrode is integrated in digital microcurrent-controlled chip electrode structure, has simplified chip structure, simplifies making work
Skill；
B) drop is transported and modification can be fast with full automation, speed, and flux is high, is conducive to larger amt or face
The Rapid Modification on product surface, and realize the precise control to modifying position；
C) modified electrode only accounts for the sub-fraction of chip, be conducive to it is more multi-functional integrated and chip it is portable should
With having expanded the range of application of digital microcurrent-controlled chip.
Description of the drawings
Fig. 1 is the structural representation of the Electrowetting device that a kind of energy of the present invention carries out surface modification based on coffee toroidal effect
(longitudinal sectional drawing).
Fig. 2 is the original of the electrode layer configuration of the Electrowetting device that the energy of the present invention carries out surface modification based on coffee toroidal effect
Rationality schematic diagram (top view).
Specific embodiment
Below in conjunction with accompanying drawing, by specific embodiment, the invention will be further described, and these embodiments are merely to illustrate
The present invention, is not limiting the scope of the invention.
What the present invention was provided based on the surface modification method of coffee toroidal effect is controlled by electrode design and drive signal
Come what is realized, therefore there can be various configurations mode, during various Digital micro-fluidic chips can be configured at.
The principle structure schematic diagram that the energy of the present invention carries out the Electrowetting device of surface modification based on coffee toroidal effect is (vertical
To profile) as shown in Figure 1.It is drive electrode (ET) and modified electrode (ED) of the invention on the substrate 104 of insulation, wherein
Drive electrode (ET) is responsible for for drop being transported to modified electrode (ED) place, but each electrode electrical isolation between any two.As substrate
104 material is not fixed, as long as insulation；Drive electrode (ET) and modified electrode (ED) in principle can be by any conductions
Material is constituted, but for facilitating chip processing technology, the two is preferably consistent material.Dielectric layer is provided with electrode layer 103
102, which is provided with hydrophobic layer 101.Substrate 104, electrode layer 103, dielectric layer 102 and hydrophobic layer 101 are together constituted under device
Pole plate 100.The drop (D) of driving is placed on bottom crown 100.The size of all electrodes, interval and number are not limited, this theory
Bright book is only by taking the electrode of certain amount and specification as an example；Accompanying drawing is only principle schematic diagram, and the position of inaccurate reaction electrode
And arrangement.
The electrode layer configuration principle of the present invention is illustrated as shown in Fig. 2 this sentences outlines device work as a example by modified electrode (ED2)
Make mode.The drive electrode (ET) of electrowetting structure transmits the drop (D) for including modification material to modified electrode on dielectric layer
(ED) center (ED0).Now central electrode (ED0) is suitable according to from inside to outside to position counter electrode (ED2) to be finished
Sequence (ED0-ED1-ED2) applied voltage successively, so that the border of drop (D) is fixed on position to be finished, keeps modification position
Counter electrode (ED2) power-up is put until drop (D) evaporation process terminates or driven electrode (ET) is transported and left.Period is except power-up
Outside electrode, other electrodes are grounded.It is to keep its boundary position to fix in drop (D) evaporation process, should suitably increases with the time
Big forcing voltage.In drop (D) evaporation process, its internal solute substance aggregation can deposit repairing under the effect of coffee toroidal effect
At decorations electrode ED2 outer ledges, so as to complete modification.It is similar to carrying out modification at other electrode positions.Should refer to
Go out, above are only the schematic illustration of the present invention, it is allowed to device architecture and purposes are entered under the premise of not affecting its functional
Row is improved and expanded.
In the present invention, the drive electrode (ET) applied voltage (power-up) refers to that chip implements counter electrode during liquid drop control
Voltage be set to not for 0 so that electrowetting drive can occur.
In the present invention, the modified electrode (ED) applied voltage (power-up) refers to that chip implements counter electrode during liquid drop control
Voltage be set to not for 0 to adjust and fixed drop boundary position.
In the present invention, the voltage of counter electrode is set to 0 or sufficient with 0 when " ground connection " refers to that chip implements liquid drop control
It is enough to be close to.
With reference to Fig. 1, Fig. 2, a kind of enforceable preparation technology of the electrolysis integrated digital micro-fluidic chip of the present invention is as follows：
Step 1, metallic film is formed in the dielectric substrate 104 of bottom crown 100 using techniques such as spin coating, evaporation, sputterings,
Drive electrode (ET) and modified electrode (ED) are formed by chemical wet etching method；
Step 2, by methods such as spin coating, physical sputtering, chemical vapor depositions insulating medium layer 102 is prepared；
Step 3, by methods such as spin coating, evaporation, spatter film formings hydrophobic layer 101 is prepared.Since then, it is of the invention based on coffee
Used by the surface modification method of toroidal effect device architecture prepare complete, by it in combination with other micro-fluidic devices after, using number
Automatization realizes various operations and the sensing of solution by the micro-fluidic operational approach of word.
Employing of the present invention can carry out the method that the Electrowetting device of surface modification carries out surface modification based on coffee toroidal effect
Comprising：
Step 1, to drive electrode (ET) applied voltage, modification is transported to by the drop containing modification material by electrode is transported
Electrode centers (that is, directly over the corresponding electrode in center of modified electrode)；
Step 2, to modified electrode (ED) applied voltage, controls the form of above-mentioned drop to determine modification position；It is preferred that
From the corresponding electrode in the center of modified electrode to the corresponding electrode in position to be finished, from inside to outside applied voltage successively, makes
The border of drop (D) is fixed on position to be finished；
Step 3, makes modification material in drop be deposited on drop edge position by evaporation process；It is preferred that evaporating
Cheng Zhong, is maintained at modification position counter electrode applied voltage, until drop (D) evaporation process terminates or driven electrode (ET) is defeated
Transport out of out.
The method of modifying of the present invention is the modification that coffee toroidal effect is applied to Electrowetting device surface on hypothalluses.
Specifically, the boundary position of the drop containing modification material is controlled and fixed by the power-up condition of modified electrode, using liquid
Coffee toroidal effect during evacuator body causes the modification material that drop internal contains to be deposited on the edge of drop.
Although present disclosure has been made to be discussed in detail by above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.After those skilled in the art have read the above, for the present invention's
Various modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (10)
1. a kind of energy carries out the Electrowetting device of surface modification based on coffee toroidal effect, it is characterised in that the Electrowetting device bag
Contain：Bottom crown (100), the bottom crown (100) by substrate (104), electrode layer (103), dielectric layer (102), hydrophobic layer (101) from
Under to above setting gradually composition；Wherein, the drop comprising modification material (D) is placed on hydrophobic layer (101)；Electrode layer (103)
Electrode (ET) and some modified electrodes (ED) are transported comprising some, electrode electrical isolation between any two；Described transports electrode
(ET) drop afferent pathway is defined；Described modified electrode (ED) is made up of some ring electrodes that from-inner-to-outer is distributed, and is passed through
Modified electrode (ED) can determine that the center of described drop (D) and marginal position.
2. coffee toroidal effect can be based on as claimed in claim 1 carries out the Electrowetting device of surface modification, it is characterised in that institute
The drive electrode (ET) and modified electrode (ED) stated is plane electrode.
3. coffee toroidal effect can be based on as claimed in claim 2 carries out the Electrowetting device of surface modification, it is characterised in that institute
The drive electrode (ET) stated and the upper and lower surface of modified electrode (ED) are respectively at same plane.
4. coffee toroidal effect can be based on as claimed in claim 1 carries out the Electrowetting device of surface modification, it is characterised in that institute
The modified electrode (ED) stated is made up of the ring electrode for wrapping up successively from inside to outside.
5. coffee toroidal effect can be based on as claimed in claim 1 carries out the Electrowetting device of surface modification, it is characterised in that institute
The material of the substrate (104) stated is insulant.
6. coffee toroidal effect can be based on as claimed in claim 1 carries out the Electrowetting device of surface modification, it is characterised in that institute
The material of the dielectric layer (102) stated is high dielectric constant material, selects any one in CEP, SU-8 and tantalum pentoxide.
7. coffee toroidal effect can be based on as claimed in claim 1 carries out the Electrowetting device of surface modification, it is characterised in that institute
The hydrophobic layer (101) stated is hydrophobic material, selects Teflon or fluororesin.
8. the energy in a kind of employing claim 1-7 described in any one carries out the electrowetting of surface modification based on coffee toroidal effect
The method that device carries out surface modification, it is characterised in that the method is included：
Step 1, to drive electrode (ET) applied voltage, modification is transported to by the drop containing modification material (D) by electrode is transported
Electrode centers；
Step 2, to modified electrode (ED) applied voltage, controls the form of above-mentioned drop (D) to determine modification position；
Step 3, makes modification material in drop be deposited on drop edge position by evaporation process.
9. method as claimed in claim 8, it is characterised in that in step 2, from the corresponding electrode in the center of modified electrode
To the corresponding electrode in position to be finished, applied voltage successively from inside to outside, the border for making drop (D) is fixed on position to be finished
Put.
10. method as claimed in claim 8, it is characterised in that in step 3, in evaporation process, is maintained at modification position pair
Electrode applied voltage is answered, until drop (D) evaporation process terminates or driven electrode (ET) is transported and left.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611177682.9A CN106669870B (en) | 2016-12-19 | 2016-12-19 | It can be based on the Electrowetting device and method of modifying that coffee ring effect is surface modified |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611177682.9A CN106669870B (en) | 2016-12-19 | 2016-12-19 | It can be based on the Electrowetting device and method of modifying that coffee ring effect is surface modified |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106669870A true CN106669870A (en) | 2017-05-17 |
| CN106669870B CN106669870B (en) | 2019-07-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611177682.9A Expired - Fee Related CN106669870B (en) | 2016-12-19 | 2016-12-19 | It can be based on the Electrowetting device and method of modifying that coffee ring effect is surface modified |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108465493A (en) * | 2018-05-04 | 2018-08-31 | 上海仁敬生物科技有限公司 | The manufacturing method of micro-fluidic chip |
| CN110270387A (en) * | 2019-06-11 | 2019-09-24 | 南京理工大学 | A kind of accurate radiator and its control method based on electrowetting on dielectric |
| CN113634293A (en) * | 2021-08-09 | 2021-11-12 | 复旦大学 | Light-operated all-inorganic EWOD device |
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| CN103170383A (en) * | 2013-03-10 | 2013-06-26 | 复旦大学 | Nano-material electrode modification based electrochemical integrated digital micro-fluidic chip |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108465493A (en) * | 2018-05-04 | 2018-08-31 | 上海仁敬生物科技有限公司 | The manufacturing method of micro-fluidic chip |
| CN108465493B (en) * | 2018-05-04 | 2021-03-02 | 上海仁敬生物科技有限公司 | Method for manufacturing micro-fluidic chip |
| CN110270387A (en) * | 2019-06-11 | 2019-09-24 | 南京理工大学 | A kind of accurate radiator and its control method based on electrowetting on dielectric |
| CN113634293A (en) * | 2021-08-09 | 2021-11-12 | 复旦大学 | Light-operated all-inorganic EWOD device |
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| Publication number | Publication date |
|---|---|
| CN106669870B (en) | 2019-07-05 |
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