CN109622079B - Preparation method of strip-shaped liquid marble - Google Patents
Preparation method of strip-shaped liquid marble Download PDFInfo
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- CN109622079B CN109622079B CN201811512779.XA CN201811512779A CN109622079B CN 109622079 B CN109622079 B CN 109622079B CN 201811512779 A CN201811512779 A CN 201811512779A CN 109622079 B CN109622079 B CN 109622079B
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- liquid
- marble
- liquid marble
- hydrophobic
- strip
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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
- B01L3/502707—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 manufacture of the container or its components
Abstract
The invention discloses a preparation method of a strip-shaped liquid marble, belonging to the technical field of regulation and control of droplet shapes, and comprising the following steps of: the method comprises the steps of preparing a liquid marble with a normal form by using common micro/nano hydrophobic particles, transferring the liquid marble to a flexible super-hydrophobic substrate, and pumping water from the liquid marble to increase the density of surface particles of the liquid marble so as to enable the surface to generate wrinkles. The pumped liquid marble rolls on the flexible super-hydrophobic substrate in a single direction or back and forth, the folds are supported and leveled under the action of pressure in the rolling process, and fluid in the marble flows in a direction perpendicular to the rolling direction, so that the strip-shaped liquid marble is finally formed. The invention breaks the limitation of the shape of the liquid marble and expands the research and application space of the liquid marble.
Description
Technical Field
The invention belongs to the technical field of regulation and control of liquid drop forms, and particularly relates to a preparation method of a long-strip-shaped liquid marble.
Background
Liquid marbles were originally reported by Aussillous and Quere in 2001. They found that when a small drop of liquid is dropped onto a hydrophobic powder and allowed to roll, the particles naturally wrap the drop and form a liquid marble. The liquid marble not only can roll on the hydrophilic surface without wetting it like an elastic ball, but also can float on the water surface because the blocking effect of the surface particles prevents the liquid drop from directly contacting the substrate. With the progress of research, it is found that the liquid marble can be used as a micro-container for gas sensing, chemical analysis, material synthesis, cell culture and the like, and various potential application values such as magnetism, electric wettability, chemical stimulation responsiveness and the like of the liquid marble can be obtained by changing external powder and internal liquid of the liquid marble. However, the conventional liquid marble has a nearly spherical shape and has a certain limitation when used as a micro-container.
Disclosure of Invention
The invention provides a preparation method of a long-strip-shaped liquid marble. The method comprises the steps of preparing liquid marbles in normal forms by using common micro-nano hydrophobic particles, transferring the liquid marbles to a flexible super-hydrophobic substrate, and pumping water from the liquid marbles to enable the surfaces of the liquid marbles to generate wrinkles and increase the particle density of the surfaces of the liquid marbles. The pumped liquid marble rolls on the flexible substrate in a single direction or back and forth, wrinkles on the surface of the marble are supported and flattened under the action of pressure and the flow of the liquid in the rolling process, and the length of the marble is gradually increased. After resting, the liquid marble assumes a stable elongated shape.
The technical scheme is as follows:
a preparation method of a strip-shaped liquid marble comprises the following steps:
Step 2, preparing liquid marbles: the preparation method comprises the following steps of paving hydrophobic powder on a flexible super-hydrophobic substrate, dripping liquid drops on the powder by using an injector, then shaking the substrate, enabling the liquid drops to roll back and forth on the powder, and enabling particles in the powder to wrap the surface of the liquid drops in the process to form liquid marbles.
Step 3, transferring the liquid marble to another flexible super-hydrophobic substrate without powder, and pumping water from the liquid marble by using an injector to increase the density of particles on the surface of the liquid drop and generate wrinkles;
and 4, rolling the pumped liquid marble in a one-way or back-and-forth manner to extend the liquid marble until the liquid marble reaches the maximum length, and preparing the strip-shaped liquid marble.
Further, in the step 1, the mass fraction of the concentrated hydrochloric acid is 10-20%.
Further, in step 1, the aluminum sheet used had a size of greater than 20cm by 12cm and a thickness of less than 0.6 mm.
Further, in step 1, both n-dodecyl mercaptan and tetradecanoic acid were used in an amount of 15 mmol/L.
Further, in step 2, the type of the liquid drop may be pure water, aqueous solution (including salt solution using water as a solvent, colloidal solution, cell culture solution, etc.), glycerol solution, etc.
Furthermore, in step 2, the particles in the powder can be various hydrophobic particles such as polytetrafluoroethylene or alkylated silica, and the particle diameter of the particles is between 10nm and 50 um.
Further, step 2 specifically comprises: the preparation method comprises the following steps of paving polytetrafluoroethylene powder or alkylated hydrophobic dioxide powder on a flexible super-hydrophobic substrate, injecting 100-1000 ul of liquid onto the powder by using a microsyringe, then shaking the substrate, and enabling liquid drops to roll back and forth on the powder to enable hydrophobic particles to be uniformly coated on the surfaces of the liquid drops to form the liquid marble.
The step 3 specifically comprises the following steps: transferring the prepared liquid marble to another flexible super-hydrophobic substrate, and extending into the liquid marble by using a syringe to extract 40-70% of liquid.
Further, step 4 specifically comprises: and tilting one end of the flexible super-hydrophobic aluminum sheet to enable the liquid marble to roll for 2-10 cm towards the other end, and gradually extending the liquid marble in the rolling process to obtain the strip-shaped liquid marble. Or tilting both ends of the flexible super-hydrophobic aluminum sheet to enable the liquid drop marble to roll back and forth, and gradually extending the liquid marble in the rolling process to obtain the strip-shaped liquid marble.
The invention has the beneficial effects that:
the invention prepares the strip-shaped liquid marble by a simple method, breaks the limitation on the shape of the liquid marble and expands the application space of the liquid marble.
Drawings
Figure 1 is a flexible super hydrophobic aluminum sheet.
FIG. 2 is a spheroidal (A) and elongated (B) water marble prepared using 100nm hydrophobic silica powder.
FIG. 3 is a spheroidal (A) and elongate (B) water marble prepared using 2 μm polytetrafluoroethylene powder.
FIG. 4 is a spheroidal (A) and elongate (B) E.coli liquid marbles prepared using 5 μm polytetrafluoroethylene powder.
Detailed Description
The technical solutions of the present invention will be described in further detail with reference to the accompanying drawings and the detailed description.
Example 1
(1) Preparation of flexible superhydrophobic substrate: 2 pieces of 20cm by 12cm by 0.3mm aluminum sheets are selected, put into 500ml of 10% concentrated hydrochloric acid to be corroded until the surfaces are completely blackish and grey, taken out, washed by water and dried. 1.53g of n-dodecyl mercaptan and 1.71g of myristic acid were added to 500ml of an ethanol solution, and the mixture was stirred uniformly to obtain a modified solution. And (3) putting the dried aluminum sheet into the prepared modification solution to be soaked for 10min, taking out and drying. Finally heating the mixture in a thermostat at 100 ℃ for 10 minutes, taking out and airing the mixture for later use.
(2) Preparing the spheroidal liquid marble: the method comprises the following steps of paving silicon dioxide hydrophobic powder with the particle size of 100nm on a super-hydrophobic aluminum substrate, dripping 500ul of water onto the powder by using an injector, then shaking the substrate, and enabling liquid drops to roll back and forth on the powder to enable particles in the powder to be uniformly wrapped on the surface of the liquid drops to form the sphere-like liquid marble.
(3) Preparing a long-strip-shaped liquid marble: the prepared liquid marble is transferred to another flexible super-hydrophobic aluminum sheet, and a syringe is inserted into the liquid marble to draw 300ul of water. And rolling the pumped liquid marble back and forth to slowly extend the liquid marble until the liquid marble reaches the maximum length, thereby obtaining the strip-shaped liquid marble.
Example 2
(1) Preparation of flexible superhydrophobic substrate: the same as in example 1.
(2) Preparing the spheroidal liquid marble: the polytetrafluoroethylene powder with the particle size of 2 mu m is laid on a flexible super-hydrophobic substrate, 500 mu l of water is dripped on the powder by an injector, then the substrate is shaken, and the liquid drops roll back and forth on the powder to enable the particles in the powder to be uniformly wrapped on the surface of the liquid drops, so that the sphere-like liquid marble is formed.
(3) Preparing a long-strip-shaped liquid marble: the prepared liquid marble was transferred to another piece of flexible super hydrophobic aluminum sheet, and a syringe was inserted into the interior of the liquid marble to draw 250. mu.l of water. One end of the aluminum sheet is lifted up,
the pumped liquid marble rolls towards the other end, and the marble is gradually stretched in the rolling process until the maximum length is reached, so that the strip-shaped liquid marble is obtained.
Example 3
(1) Preparing a super-hydrophobic flexible substrate: the same as in example 1.
(2) Preparing the spheroidal liquid marble: and (3) paving polytetrafluoroethylene powder with the particle size of 5 mu m on a flexible super-hydrophobic aluminum sheet, injecting 500 mu l of escherichia coli culture liquid drop on the powder by using an injector, then shaking a substrate, and rolling the liquid drop on the powder back and forth to enable particles in the powder to be uniformly coated on the surface of the liquid drop to form the sphere-like liquid marble.
(3) Preparing a long-strip-shaped liquid marble: the prepared liquid marble is transferred to another flexible super-hydrophobic aluminum sheet, and a syringe is inserted into the liquid marble to extract 300 mul of escherichia coli culture solution. The liquid marble after pumping water is rolled back and forth to slowly extend until the maximum length is reached, so that the strip-shaped liquid marble is obtained.
The above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, and any simple modifications or equivalent substitutions of the technical solutions that can be obviously obtained by those skilled in the art within the technical scope of the present invention are within the scope of the present invention.
Claims (4)
1. The preparation method of the strip-shaped liquid marble is characterized by comprising the following steps of:
step 1, preparing a flexible super-hydrophobic substrate: taking a light and thin aluminum sheet with a proper size, reacting the aluminum sheet with concentrated hydrochloric acid, modifying the surface of the aluminum sheet with a mixed solution of n-dodecyl mercaptan and myristic acid after the reaction, and drying to obtain a flexible super-hydrophobic substrate;
the size of the aluminum sheet is more than 20cm by 12cm, and the thickness is less than 0.6 mm; the mass fraction of the concentrated hydrochloric acid is 10-20%; dispersing 15mmol/L n-dodecyl mercaptan and tetradecanoic acid in ethanol solvent;
step 2, preparing the spheroidal liquid marble: laying hydrophobic powder on a flexible super-hydrophobic substrate, dripping liquid on the powder by using an injector, then shaking the substrate, and rolling the liquid drop on the powder back and forth to enable particles in the powder to be uniformly wrapped on the surface of the liquid drop to form a sphere-like liquid marble; the liquid volume is 100ul-1000 ul;
step 3, pumping a certain amount of liquid from the spherical liquid marble to increase the density of the particles on the surface of the marble and generate wrinkles;
specifically, transferring the prepared sphere-like liquid marble to another flexible super-hydrophobic substrate without powder, inserting a syringe into the liquid marble and extracting 40-70% of liquid;
step 4, rolling the liquid marble subjected to liquid pumping in a one-way or back-and-forth manner to enable the liquid marble to extend until the liquid marble reaches the maximum length, and preparing a strip-shaped liquid marble;
specifically, one end of a flexible super-hydrophobic aluminum sheet is tilted to enable a liquid marble to roll for 2cm-10cm towards the other end, the liquid marble is gradually extended in the rolling process to obtain a long-strip-shaped liquid marble, or two ends of the flexible super-hydrophobic aluminum sheet are tilted to enable a liquid drop marble to roll back and forth, and the liquid marble is gradually extended in the rolling process to obtain a long-strip-shaped liquid marble.
2. The method for preparing elongated liquid marbles according to claim 1 wherein in step 2, the particle size of the hydrophobic powder is between 10nm and 50 um.
3. The method for preparing long-strip-shaped liquid marble as claimed in claim 2, wherein in step 2, the type of the liquid is pure water, aqueous solution, glycerin or glycerin solution.
4. The method of claim 3, wherein the aqueous solution comprises a salt solution, a colloidal solution, a cell culture solution in water as a solvent.
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| CN201811512779.XA CN109622079B (en) | 2018-12-11 | 2018-12-11 | Preparation method of strip-shaped liquid marble |
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| CN201811512779.XA CN109622079B (en) | 2018-12-11 | 2018-12-11 | Preparation method of strip-shaped liquid marble |
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| CN109622079A CN109622079A (en) | 2019-04-16 |
| CN109622079B true CN109622079B (en) | 2021-03-19 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110404474A (en) * | 2019-07-05 | 2019-11-05 | 金华职业技术学院 | A kind of preparation method of spherical liquid particle |
| CN111420613B (en) * | 2020-05-07 | 2023-09-26 | 桂林电子科技大学 | Boxed liquid marble preparation device and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104959086A (en) * | 2015-06-16 | 2015-10-07 | 西北师范大学 | Method of utilizing flexible super-hydrophobic surface paper to prepare liquid marbles |
| CN106513267A (en) * | 2016-11-17 | 2017-03-22 | 榆林学院 | Aluminum powder doped aluminum oxide hydrophobic film and preparation method thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104959086A (en) * | 2015-06-16 | 2015-10-07 | 西北师范大学 | Method of utilizing flexible super-hydrophobic surface paper to prepare liquid marbles |
| CN106513267A (en) * | 2016-11-17 | 2017-03-22 | 榆林学院 | Aluminum powder doped aluminum oxide hydrophobic film and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| Liquid marbles with in-flows and out-flows: characteristics and performance limits;Abdullah Bajwa等;《Soft Matter》;20121016;第11604至11608页 * |
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Granted publication date: 20210319 Termination date: 20211211 |