CN109173740A - A kind of preparation method of water single channel film - Google Patents
A kind of preparation method of water single channel film Download PDFInfo
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- CN109173740A CN109173740A CN201811259039.XA CN201811259039A CN109173740A CN 109173740 A CN109173740 A CN 109173740A CN 201811259039 A CN201811259039 A CN 201811259039A CN 109173740 A CN109173740 A CN 109173740A
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
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Abstract
A kind of preparation method of water single channel film, it is related to the preparation method that a kind of liquid unidirectionally transports film.The invention aims to solve the existing water single channel film for preparing there are complex process, using equipment valuableness, and two sides has the problem of lesser wetting sex differernce.Method: one, hydrophilic base is cleaned；Two, the hydrophilic base of dopamine coating is prepared；Three, oil-water interfaces are prepared；Four, modified, obtain water single channel film.The hydrophilic base that dopamine coats is placed at oil-water interfaces by the present invention, the two sides of the hydrophilic base of dopamine coating are subjected to asymmetric modification, the preparation method of water single channel film is widened, prepared water single channel film two sides has biggish wetting sex differernce, and preparation method is not necessarily to the use of special installation, it is simple to operation.The present invention can get a kind of preparation method of water single channel film.The present invention can get a kind of preparation method of water single channel film.
Description
Technical field
The present invention relates to the preparation methods that a kind of liquid unidirectionally transports film.
Background technique
In nature, the unidirectional transport phenomena of liquid is a kind of common phenomenon.Such as water in animal and plant cells film
Infiltration, the collection of beetle back water in nano-cloth desert can overwork water droplet on spider silk, the waterfall formed by topography, plant
The root of object absorbs water from soil and the transport of plant internal water etc..It can be seen that the drive that liquid unidirectionally transports
Power can be pressure, gravity, be also possible to geometry, wetting gradient of material etc..Currently, caused by by wetting gradient
Liquid unidirectionally transports, and because of its bring interesting fact, and can greatly improve energy efficiency and be concerned.Soak gradient or not
The unidirectional transport of symmetrical wetability driving liquid show themselves in that when water droplet drop is on the single pass hydrophobic surface of water contact angle compared with
Greatly, under the synergistic effect of gravity, capillary force and Laplce's power, water droplet stops of short duration several seconds on hydrophobic surface
After penetrate；And when water droplet drop is on the single pass hydrophilic surface of water, water droplet is sprawled, and contact angle is smaller, due to back side hydrophobic surface
In the presence of water droplet can not penetrate, this is referred to as water single channel phenomenon or " liquid diode ".
Currently, preparing water single channel film, there are complex process, and using equipment valuableness, and two sides has lesser wetability poor
Different defect.
Summary of the invention
The invention aims to solve the existing water single channel film for preparing there are complex process, using equipment valuableness, and two
Face has the problem of lesser wetting sex differernce, and provides a kind of preparation method of water single channel film.
A kind of preparation method of water single channel film, is completed by the following steps:
One, it using washes of absolute alcohol hydrophilic base 3 times~5 times, then dries at room temperature, obtains washes of absolute alcohol
Hydrophilic base afterwards；
Two, dopamine is added in the Tris-HCl buffer solution of pH=8.5, obtains the Tris-HCl containing dopamine
Buffer solution；Hydrophilic base after washes of absolute alcohol is immersed in the Tris-HCl buffer solution containing dopamine, then
20h~28h is reacted on constant-temperature table, obtains the hydrophilic base of dopamine coating；
The volume ratio of the Tris-HCl buffer solution of the quality and pH=8.5 of dopamine described in step 2 is (0.1g
~0.3g): 100mL；
Three, oil-water interfaces are prepared:
Oil-water interfaces are prepared using method one or method two；
The method one are as follows: the substance containing hydrophobic chain is dissolved into heavy oil, adds distilled water, obtains grease circle
Face；The substance containing hydrophobic chain is octadecylamine；The quality of the substance containing hydrophobic chain and the volume ratio of heavy oil
For (1mg~3mg): 1mL；The volume ratio of the heavy oil and distilled water is (2~4): 5；
The method two are as follows: the substance containing hydrophobic chain is dissolved into light oil, then is added dropwise to using distilled water immersion
Above hydrophilic base afterwards, oil-water interfaces are obtained；The substance containing hydrophobic chain is octadecylamine；Described containing is hydrophobic
The quality of the substance of chain and the volume ratio of light oil are (1mg~3mg): 1mL；The hydrophilic base is cotton or non-woven fabrics；
Light oil height above the hydrophilic base is 10mm~20mm；
Four, the hydrophilic base that dopamine coats is cleaned 3 times~5 times using distilled water, then be placed at oil-water interfaces
Modified 10h~15h, then hydrophilic base is taken out, it reuses distilled water and cleans 3 times~5 times, then dry at room temperature, obtain
Water single channel film.
The principle of the present invention and advantage:
One, hydrophilic base is carried out precoating with dopamine first by the present invention, and hydrophilic base is made not only to maintain original
Some hydrophilies, also introduce functional group, can carry out secondary modification；Substance (such as octadecylamine) containing hydrophobic chain is dissolved in
In oily phase, Michael addition reaction can be occurred with the substance (such as octadecylamine) containing hydrophobic chain by poly-dopamine and schiff bases is anti-
It answers, the substance containing hydrophobic chain (such as octadecylamine) is extremely low in the solubility of water phase simultaneously, thus (such as by the substance containing hydrophobic chain
Octadecylamine) it is grafted on the side of film；
Two, the present invention provides a kind of novel processing steps of water single channel film, realize the single pass characteristic of water, preparation
Processes and apparatus is simple；
Three, the hydrophilic base of dopamine coating is placed at oil-water interfaces by the present invention, the hydrophily that dopamine is coated
The two sides of substrate carry out asymmetric modification, have widened the preparation method of water single channel film, prepared water single channel film two sides
With biggish wetting sex differernce, and preparation method is not necessarily to the use of special installation, simple to operation.
The present invention can get a kind of preparation method of water single channel film.
Detailed description of the invention
Fig. 1 is the digital photograph of the water single channel film in embodiment one using the preparation of heavy oil/water termination, and 1 is pool in figure
Domain, 2 be heavy oil region, and 3 attach most importance to oil-water boundary；
Fig. 2 is the digital photograph of the water single channel film in embodiment two using the preparation of light oil/water termination, and 1 is light oil in figure
Area, 2 be the cotton after distilled water immersion；
Fig. 3 is the test and contact of the aerial initial contact angle of hydrophobic surface of water single channel film prepared by embodiment one
Change with time figure at angle；
Fig. 4 is the aerial water contact angle variation diagram of hydrophilic surface of water single channel film prepared by embodiment one；
Fig. 5 was the hydrophobic surface digital photograph figure that water droplet passes through when upper of water single channel film prepared by embodiment one, 1 in figure
It is petroleum ether for dropper, 2, the 3 water single channel films prepared for embodiment one are placed at oil-water interfaces, and hydrophobic face-up, 4 be water
Phase, 5 penetrate the shape after the water single channel film of the preparation of embodiment one for water droplet；
The hydrophilic surface for the water single channel film that Fig. 6 is prepared for embodiment one intransitable digital photograph figure of water droplet when upper,
1 is dropper in figure, and 2 be petroleum ether, and the 3 water single channel films prepared for embodiment one are placed at oil-water interfaces, hydrophilic face-up, 4
For water phase.
Specific embodiment
Specific embodiment 1: the preparation method that present embodiment is a kind of water single channel film is to complete according to the following steps
:
One, it using washes of absolute alcohol hydrophilic base 3 times~5 times, then dries at room temperature, obtains washes of absolute alcohol
Hydrophilic base afterwards；
Two, dopamine is added in the Tris-HCl buffer solution of pH=8.5, obtains the Tris-HCl containing dopamine
Buffer solution；Hydrophilic base after washes of absolute alcohol is immersed in the Tris-HCl buffer solution containing dopamine, then
20h~28h is reacted on constant-temperature table, obtains the hydrophilic base of dopamine coating；
The volume ratio of the Tris-HCl buffer solution of the quality and pH=8.5 of dopamine described in step 2 is (0.1g
~0.3g): 100mL；
Three, oil-water interfaces are prepared:
Oil-water interfaces are prepared using method one or method two；
The method one are as follows: the substance containing hydrophobic chain is dissolved into heavy oil, adds distilled water, obtains grease circle
Face；The substance containing hydrophobic chain is octadecylamine；The quality of the substance containing hydrophobic chain and the volume ratio of heavy oil
For (1mg~3mg): 1mL；The volume ratio of the heavy oil and distilled water is (2~4): 5；
The method two are as follows: the substance containing hydrophobic chain is dissolved into light oil, then is added dropwise to using distilled water immersion
Above hydrophilic base afterwards, oil-water interfaces are obtained；The substance containing hydrophobic chain is octadecylamine；Described containing is hydrophobic
The quality of the substance of chain and the volume ratio of light oil are (1mg~3mg): 1mL；The hydrophilic base is cotton or non-woven fabrics；
Light oil height above the hydrophilic base is 10mm~20mm；
One, the hydrophilic base that dopamine coats is cleaned 3 times~5 times using distilled water, then be placed at oil-water interfaces
Modified 10h~15h, then hydrophilic base is taken out, it reuses distilled water and cleans 3 times~5 times, then dry at room temperature, obtain
Water single channel film.
The principle and advantage of present embodiment:
One, hydrophilic base is carried out precoating with dopamine first by present embodiment, keeps hydrophilic base not only
Original hydrophily, also introduces functional group, can carry out secondary modification；Substance (such as octadecylamine) containing hydrophobic chain is molten
In oily phase, through poly-dopamine and the substance (such as octadecylamine) containing hydrophobic chain Michael addition reaction and Schiff can occur for solution
Alkali reaction, the substance containing hydrophobic chain (such as octadecylamine) is extremely low in the solubility of water phase simultaneously, thus by the object containing hydrophobic chain
Matter (such as octadecylamine) is grafted on the side of film；
Two, present embodiments provide for a kind of novel processing steps of water single channel film, realize the single pass characteristic of water,
Preparation process and equipment are simple；
Three, the hydrophilic base that dopamine coats is placed at oil-water interfaces by present embodiment, the parent that dopamine is coated
The two sides of aqueous substrate carry out asymmetric modification, have widened the preparation method of water single channel film, prepared water single channel film
Two sides has biggish wetting sex differernce, and preparation method is not necessarily to the use of special installation, simple to operation.
Present embodiment can get a kind of preparation method of water single channel film.
Specific embodiment 2: the difference of present embodiment and specific embodiment one is: parent described in step 1
Aqueous substrate is cotton or non-woven fabrics.It is other same as the specific embodiment one.
Specific embodiment 3: the difference of present embodiment and specific embodiment one or two is: described in step 2
Constant-temperature table temperature be 20 DEG C~25 DEG C, rotation speed be 50r/min~80r/min.Other and specific embodiment one
Or two is identical.
Specific embodiment 4: the difference of present embodiment and specific embodiment one to three is: described in step 2
Dopamine quality and pH=8.5 Tris-HCl buffer solution volume ratio be (0.1g~0.2g): 100mL.It is other with
Specific embodiment one to three is identical.
Specific embodiment 5: the difference of present embodiment and specific embodiment one to four is: described in step 3
Heavy oil be dichloroethanes.It is other identical as specific embodiment one to four.
Specific embodiment 6: the difference of present embodiment and specific embodiment one to five is: described in step 3
The substance containing hydrophobic chain quality and heavy oil volume ratio be (1mg~2mg): 1mL.It is other with specific embodiment one to
Five is identical.
Specific embodiment 7: the difference of present embodiment and specific embodiment one to six is: described in step 3
Heavy oil and distilled water volume ratio be (2~3): 5.It is other identical as specific embodiment one to six.
Specific embodiment 8: the difference of present embodiment and specific embodiment one to seven is: described in step 3
Light oil be hexadecane, petroleum ether or n-hexane.It is other identical as specific embodiment one to seven.
Specific embodiment 9: the difference of present embodiment and specific embodiment one to eight is: described in step 3
The substance containing hydrophobic chain quality and light oil volume ratio be (1mg~2mg): 1mL.It is other with specific embodiment one to
Eight is identical.
Specific embodiment 10: the difference of present embodiment and specific embodiment one to nine is: being used in step 4
Distilled water cleans the hydrophilic base that dopamine coats 3 times~5 times, then is placed at oil-water interfaces modified 12h~14h, then
Hydrophilic base is taken out, distilled water is reused and cleans 3 times~5 times, then dry at room temperature, obtain water single channel film.It is other
It is identical as specific embodiment one to nine.
Beneficial effects of the present invention are verified using following embodiment:
Embodiment one: a kind of preparation method of water single channel film is completed by the following steps:
One, it using washes of absolute alcohol hydrophilic base 5 times, then dries at room temperature, after obtaining washes of absolute alcohol
Hydrophilic base；
Hydrophilic base described in step 1 is the round cotton that diameter is 3cm；
Two, dopamine is added in the Tris-HCl buffer solution of pH=8.5, obtains the Tris-HCl containing dopamine
Buffer solution；Hydrophilic base after washes of absolute alcohol is immersed in the Tris-HCl buffer solution containing dopamine, then
The hydrophilic base for obtaining dopamine coating for 24 hours is reacted on constant-temperature table；
The volume ratio of the Tris-HCl buffer solution of the quality and pH=8.5 of dopamine described in step 2 is 0.2g:
100mL；
The temperature of constant-temperature table described in step 2 is 25 DEG C, rotation speed 80r/min；
Three, oil-water interfaces are prepared:
Substance containing hydrophobic chain is dissolved into heavy oil, distilled water is added, obtains oil-water interfaces；
Substance described in step 3 containing hydrophobic chain is octadecylamine；
Heavy oil described in step 3 is dichloroethanes；
The quality of substance described in step 3 containing hydrophobic chain and the volume ratio of heavy oil are 1mg:1mL；
The volume ratio of heavy oil described in step 3 and distilled water is 3:5；
Four, the hydrophilic base that dopamine coats is cleaned 5 times using distilled water, then be placed at oil-water interfaces modified
10h, then hydrophilic base is taken out, it reuses distilled water and cleans 5 times, then dry at room temperature, obtain water single channel film.
Embodiment two: a kind of preparation method of water single channel film is completed by the following steps:
One, it using washes of absolute alcohol hydrophilic base 5 times, then dries at room temperature, after obtaining washes of absolute alcohol
Hydrophilic base；
Hydrophilic base described in step 1 is the round cotton that diameter is 3cm；
Two, dopamine is added in the Tris-HCl buffer solution of pH=8.5, obtains the Tris-HCl containing dopamine
Buffer solution；Hydrophilic base after washes of absolute alcohol is immersed in the Tris-HCl buffer solution containing dopamine, then
The hydrophilic base for obtaining dopamine coating for 24 hours is reacted on constant-temperature table；
The volume ratio of the Tris-HCl buffer solution of the quality and pH=8.5 of dopamine described in step 2 is 0.2g:
100mL；
The temperature of constant-temperature table described in step 2 is 25 DEG C, rotation speed 80r/min；
Three, oil-water interfaces are prepared:
Substance containing hydrophobic chain is dissolved into light oil, then is added dropwise to using on the hydrophilic base after distilled water immersion
Face obtains oil-water interfaces；
Substance described in step 3 containing hydrophobic chain is octadecylamine；
Light oil described in step 3 is n-hexane；
The quality of substance described in step 3 containing hydrophobic chain and the volume ratio of light oil are 1mg:1mL；
Hydrophilic base described in step 3 is cotton；
Light oil height above hydrophilic base described in step 3 is 15mm；
Four, the hydrophilic base that dopamine coats is cleaned 5 times using distilled water, then be placed at oil-water interfaces modified
10h, then hydrophilic base is taken out, it reuses distilled water and cleans 5 times, then dry at room temperature, obtain water single channel film.
Fig. 1 is the digital photograph of the water single channel film in embodiment one using the preparation of heavy oil/water termination, and 1 is pool in figure
Domain, 2 be heavy oil region, and 3 attach most importance to oil-water boundary；
From fig. 1, it can be seen that oil, water can form stable interface, can be rested on for a long time with the cotton that dopamine coats
Interface, a face contact oil phase, a face contact water phase.
Fig. 2 is the digital photograph of the water single channel film in embodiment two using the preparation of light oil/water termination, and 1 is light oil in figure
Area, 2 be the cotton after distilled water immersion；
As can be seen from Figure 2, the cotton sufficiently soaked with distilled water can support the light oil column of certain altitude, to realize more
One face contact oil phase of the cotton of bar amine coating.
Fig. 3 is the test and contact of the aerial initial contact angle of hydrophobic surface of water single channel film prepared by embodiment one
Change with time figure at angle；
As can be seen from Figure 3, originally contact angle is 119 °, it was demonstrated that the side hydrophobic modification success of cotton, after 10 seconds, water droplet disappears
It loses, illustrates that water droplet can penetrate into hydrophilic surface side from hydrophobic surface.
Fig. 4 is the aerial water contact angle variation diagram of hydrophilic surface of water single channel film prepared by embodiment one；
As can be seen from Figure 4, contact angle is 0 °, it was demonstrated that the other side of cotton maintains good hydrophily, and water droplet is in hydrophilic surface
It sprawls, and hydrophobic surface side cannot be penetrated into, demonstrate water single channel phenomenon well.
Fig. 5 was the hydrophobic surface digital photograph figure that water droplet passes through when upper of water single channel film prepared by embodiment one, 1 in figure
It is petroleum ether for dropper, 2, the 3 water single channel films prepared for embodiment one are placed at oil-water interfaces, and hydrophobic face-up, 4 be water
Phase, 5 penetrate the shape after the water single channel film of the preparation of embodiment one for water droplet；
As can be seen from Figure 5, when water droplet falls in hydrophobic side, it keeps original spherical state in drop-off positions, then penetrates film,
Jellyfish shape is presented.
The hydrophilic surface for the water single channel film that Fig. 6 is prepared for embodiment one intransitable digital photograph figure of water droplet when upper,
1 is dropper in figure, and 2 be petroleum ether, and the 3 water single channel films prepared for embodiment one are placed at oil-water interfaces, hydrophilic face-up, 4
For water phase.
As can be seen from Figure 6, when fabric to be inverted, water droplet is sprawled, and cannot penetrate film；It is existing that water single channel is demonstrated well
As.
Claims (10)
1. a kind of preparation method of water single channel film, it is characterised in that a kind of preparation method of water single channel film is according to the following steps
It completes:
One, it using washes of absolute alcohol hydrophilic base 3 times~5 times, then dries at room temperature, after obtaining washes of absolute alcohol
Hydrophilic base；
Two, dopamine is added in the Tris-HCl buffer solution of pH=8.5, obtains the Tris-HCl buffering containing dopamine
Solution；Hydrophilic base after washes of absolute alcohol is immersed in the Tris-HCl buffer solution containing dopamine, then in perseverance
Temperature shakes bed reaction 20h~28h, obtains the hydrophilic base of dopamine coating；
The volume ratio of the Tris-HCl buffer solution of the quality and pH=8.5 of dopamine described in step 2 be (0.1g~
0.3g):100mL；
Three, oil-water interfaces are prepared:
Oil-water interfaces are prepared using method one or method two；
The method one are as follows: the substance containing hydrophobic chain is dissolved into heavy oil, adds distilled water, obtains oil-water interfaces；
The substance containing hydrophobic chain is octadecylamine；The quality of substance containing hydrophobic chain and the volume ratio of heavy oil be
(1mg~3mg): 1mL；The volume ratio of the heavy oil and distilled water is (2~4): 5；
The method two are as follows: the substance containing hydrophobic chain is dissolved into light oil, then is added dropwise to using after distilled water immersion
Above hydrophilic base, oil-water interfaces are obtained；The substance containing hydrophobic chain is octadecylamine；It is described containing hydrophobic chain
The quality of substance and the volume ratio of light oil are (1mg~3mg): 1mL；The hydrophilic base is cotton or non-woven fabrics；It is described
Hydrophilic base above light oil height be 10mm~20mm；
Four, the hydrophilic base that dopamine coats is cleaned 3 times~5 times using distilled water, then be placed at oil-water interfaces modified
10h~15h, then hydrophilic base is taken out, it reuses distilled water and cleans 3 times~5 times, then dry at room temperature, obtain water list
Channel membrane.
2. a kind of preparation method of water single channel film according to claim 1, it is characterised in that parent described in step 1
Aqueous substrate is cotton or non-woven fabrics.
3. a kind of preparation method of water single channel film according to claim 1, it is characterised in that perseverance described in step 2
The temperature of warm shaking table is 20 DEG C~25 DEG C, and rotation speed is 50r/min~80r/min.
4. a kind of preparation method of water single channel film according to claim 1, it is characterised in that more described in step 2
The volume ratio of the Tris-HCl buffer solution of the quality and pH=8.5 of bar amine is (0.1g~0.2g): 100mL.
5. a kind of preparation method of water single channel film according to claim 1, it is characterised in that weight described in step 3
Oil is dichloroethanes.
6. a kind of preparation method of water single channel film according to claim 1, it is characterised in that contain described in step 3
The volume ratio of the quality and heavy oil that have the substance of hydrophobic chain is (1mg~2mg): 1mL.
7. a kind of preparation method of water single channel film according to claim 1, it is characterised in that weight described in step 3
The volume ratio of oil and distilled water is (2~3): 5.
8. a kind of preparation method of water single channel film according to claim 1, it is characterised in that light described in step 3
Oil is hexadecane, petroleum ether or n-hexane.
9. a kind of preparation method of water single channel film according to claim 1, it is characterised in that contain described in step 3
The volume ratio of the quality and light oil that have the substance of hydrophobic chain is (1mg~2mg): 1mL.
10. a kind of preparation method of water single channel film according to claim 1, it is characterised in that use distillation in step 4
Water cleans the hydrophilic base that dopamine coats 3 times~5 times, then is placed at oil-water interfaces modified 12h~14h, then will be close
Aqueous substrate takes out, and reuses distilled water and cleans 3 times~5 times, then dry at room temperature, obtains water single channel film.
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| CN104831534A (en) * | 2015-03-06 | 2015-08-12 | 哈尔滨工业大学宜兴环保研究院 | Super-hydrophobic and -oleophylic cloth producing method |
| CN105080357A (en) * | 2015-08-20 | 2015-11-25 | 哈尔滨工业大学 | Method for preparing super-hydrophobic composite membrane from water dispersible particles |
| CN106268355A (en) * | 2016-08-31 | 2017-01-04 | 浙江大学 | A kind of asymmetric super parent/hydrophobic pair of property polymeric film and preparation method thereof |
| CN107158980A (en) * | 2017-06-07 | 2017-09-15 | 浙江大学 | Utilized thin film composite membranes reacted based on air liquid interface and its preparation method and application |
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Application publication date: 20190111 |