CN103769750B - Picosecond laser is utilized to make strontium titanates surface become the method for ultra-hydrophilic surface - Google Patents

Picosecond laser is utilized to make strontium titanates surface become the method for ultra-hydrophilic surface Download PDF

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CN103769750B
CN103769750B CN201410030302.3A CN201410030302A CN103769750B CN 103769750 B CN103769750 B CN 103769750B CN 201410030302 A CN201410030302 A CN 201410030302A CN 103769750 B CN103769750 B CN 103769750B
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line
strontium titanate
picosecond laser
make
laser
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CN103769750A (en
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蒋毅坚
丁杰
赵艳
季凌飞
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Beijing University of Technology
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/50—Inorganic material, e.g. metals, not provided for in B23K2103/02 – B23K2103/26
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/0006—Working by laser beam, e.g. welding, cutting or boring taking account of the properties of the material involved
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/352—Working by laser beam, e.g. welding, cutting or boring for surface treatment
    • B23K26/359—Working by laser beam, e.g. welding, cutting or boring for surface treatment by providing a line or line pattern, e.g. a dotted break initiation line

Abstract

Utilize picosecond laser to make strontium titanates surface become the method for ultra-hydrophilic surface, belong to solid material surface modification field, utilize picosecond laser to the change of strontium titanate crystals surface wettability, make strontium titanates surface have the method for super hydrophilic profile.The method of change strontium titanates surface wettability of the present invention is at normal temperatures, use picosecond laser, etching line is carried out to material, obtain neat linear array structure, increase the roughness of material surface, the contact angle of material surface is changed, to hydrophilic side to transformation, and reaches super hydrophilic.Method of the present invention is simple, can carry out in open environment, and preparation technology is flexible, and controllability is high.By the sweep spacing of galvanometer, the interval of line can be controlled flexibly, thus the contact angle of control surface.Other material need not be introduced in preparation process, directly rule on material, not affect material character under layer, also do not produce environmental pollution.

Description

Picosecond laser is utilized to make strontium titanates surface become the method for ultra-hydrophilic surface
Technical field
Patent of the present invention belongs to solid material surface modification field, particularly utilizes picosecond laser to the change of strontium titanate crystals surface wettability, makes strontium titanates surface contact angle become the method for ultra-hydrophilic surface.
Background technology
Strontium titanates is a kind of perovskite structure crystal, is a kind of broad-spectrum electronic functional material, has the advantages such as dielectric constant is high, dielectric loss is low, Heat stability is good, is widely used in electronics, machinery and ceramic industry.Simultaneously, as a kind of functional material, strontium titanates has the features such as energy gap high (3.4eV), photocatalytic activity be excellent, and there is unique electromagnetic property and redox catalysis activity, have also been obtained in photocatalysis field such as photocatalytic hydrogen production by water decomposition, photocatalysis degradation organic contaminant and photochemical cells and apply widely.Meanwhile, strontium titanates also as high-temperature superconductor base material, is also widely used.As base material, surface contact angle, to the film grown, has many impacts thereon.Therefore, for the research of strontium titanates surface contact angle, be also highly significant.
At present for the change of strontium titanate crystals surface wettability, mainly contain these two kinds of methods following.2000, the people such as MasahiroMiyauchi, utilized Ultra-Violet Laser irradiation strontium titanates, the contact angle of strontium titanates is reduced, reaches at about 20 degree.2007, MasahiroMiyauchi by the method for chemistry, made crystallization strontium titanates nano-rod film structure, has made the contact angle on strontium titanates surface be reduced to less than 5 degree, reached super hydrophilic again on strontium titanates surface.Here it is up to the present, this material surface contact angle of strontium titanate crystals changed to the situation of research.Can find out that first method changes contact angle by laser irradiation simple, convenient, but, do not reach super hydrophilic, although second method reaches super hydrophilic by making nano-rod film on surface, but such manufacturing process more complicated, and formation is film, destroys crystal structure, no longer has the special nature of strontium titanate monocrystal.
By the comparison of two kinds of methods above, can find out and change surface topography to obtain super hydrophilic possibility larger, therefore I contemplates and utilizes laser to change strontium titanates surface topography, thus obtains super hydrophilic strontium titanates surface.Change surface topography for utilizing laser thus change the method for contact angle, also having many reports.2009, the people such as M.Zhou utilized femtosecond laser to make micro-nano structure on K9 glass, made K9 glass surface reach super hydrophobic surface; 2012, the people such as Md.ShamimAhsana utilized femtosecond laser to draw micro-nano rice noodles on soda-lime glass, the contact angle of glass is reached 150 from about 100 degree more and spends, reach super-hydrophobic.From introduction above, can find out that also concentrate on femtosecond laser, but femto-second laser is too expensive, repetition rate is low, is not suitable for industrial production at present for making controllable micro-nano structure on surface thus the research of change contact angle.And picosecond laser has ultrashort pulsewidth, adjust working process parameter, its processing effect and femtosecond pulse are as good as.And picosecond laser repetition rate is high, and working (machining) efficiency is high, Laser output is stablized, and crudy is high, and laser instrument price is relatively cheap, and processing cost is low.Have so many advantage, therefore I have selected and utilize picosecond laser to process strontium titanates surface, makes micro-structural, and make contact angle reach super hydrophilic on strontium titanates surface.
Summary of the invention
The object of the invention is the method utilizing picosecond laser to rule, obtain super hydrophilic surface, manufacturing process is simple, and ageing good, does not change in time, does not destroy crystal structure.
Patent of the present invention solves the scheme that its technical problem adopts: the strontium titanate crystals sheet surface line utilizing picosecond laser cleaning up, obtains super hydrophilic surface.
Line can obtain the linear array pattern at any interval in theory.Obtain neat line arrangement pattern in the line of strontium titanate crystals sheet surface, the center distance of preferred live width 50 microns, line-to-line is less than 170 microns.
Concrete operation method, comprises the following steps: by strontium titanate crystals sheet, cleaning, be fixed on ceramic sheet, again sample being placed on the focal position at picosecond laser place, making hot spot at the beginning outside sample, when not opening the light, run galvanometer, observe direction and the position of hot spot line, and regulate the position of sample, make one end and the line parallel of sample, but make the Origin And Destination of laser not on sample, this can obtain complete line arrangement pattern; After regulating position, open laser instrument, wait for 30 seconds, laser instrument is exported and reaches requirement, at this moment galvanometer is run, carry out line and obtain line arrangement pattern, in the process, the power of laser instrument is 10 watts, frequency is 100 hertz, the sweep speed of galvanometer is 600-1000 metre per second (m/s), every bar line number of repetition is 15-25 time.
The center distance of live width of the present invention 50 microns, line-to-line is less than 170 microns, and surface contact angle is all less than 10 degree, reaches ultra-hydrophilic surface.Change the interval of line, surface contact angle is also along with change, and interval is larger, and contact angle is larger.
Compared with prior art, the present invention has obvious novelty: utilize picosecond laser to the change of strontium titanate crystals surface wettability, makes strontium titanates surface have the method for super hydrophilic profile.The method of change strontium titanates surface wettability of the present invention is at normal temperatures, use picosecond laser, etching line is carried out to material, obtain neat linear array structure, increase the roughness of material surface, the contact angle of material surface is changed, to hydrophilic side to transformation, and reaches super hydrophilic.Method of the present invention is simple, can carry out in open environment, and preparation technology is flexible, and controllability is high.By the sweep spacing of galvanometer, the interval of line can be controlled flexibly, thus the contact angle of control surface.Other material need not be introduced in preparation process, directly rule on material, not affect material character under layer, also do not produce environmental pollution.
Picosecond laser line strontium titanates can carry out in open environment, and preparation technology is flexible, and operation is simple, and controllability is high, and replicability is strong.By the sweep spacing of galvanometer, the interval of line can be controlled flexibly, thus but the contact angle of control surface.Other material need not be introduced in preparation process, directly rule on material, not affect material character under layer, also do not produce environmental pollution.
Accompanying drawing explanation
Fig. 1 is the sample surfaces (being spaced apart 100 microns) after line;
Fig. 2: the Contact-angle measurement figure being spaced apart 100 mum sample;
Fig. 3: the Contact-angle measurement figure being spaced apart 150 mum sample;
Fig. 4: the Contact-angle measurement figure being spaced apart 170 mum sample;
Fig. 5: the Contact-angle measurement figure being spaced apart 180 mum sample;
Fig. 6: the Contact-angle measurement figure being spaced apart 190 mum sample;
Fig. 7: the Contact-angle measurement figure being spaced apart 200 mum sample.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail, but the present invention is not limited to following examples.The power of the laser instrument of following examples is 10 watts, frequency is 100 hertz, the sweep speed of galvanometer is 800 metre per second (m/s)s, every bar line number of repetition is 15 times.
Embodiment 1
The too sour strontium single-chip of the 10mm*5mm after selecting a slice to clean, is fixed on smooth potsherd, is placed in the focus of laser instrument.Regulate galvanometer parameter, make line be spaced apart 100 microns, run galvanometer, regulate sample, open the light, rerun galvanometer, and obtaining live width is 50 microns, and line centre distance is the surface topography of 100 microns.
Utilize contact angle measurement measurement contact angle now, obtaining result is 1.6 degree.Therefore, can say that surface is now ultra-hydrophilic surface.
Embodiment 2
The too sour strontium single-chip of the 10mm*5mm after selecting a slice to clean, is fixed on smooth potsherd, is placed in the focus of laser instrument.Regulate galvanometer parameter, make line be spaced apart 150 microns, run galvanometer, regulate sample, open the light, rerun galvanometer, and obtaining live width is 50 microns, and line centre distance is the surface topography of 150 microns.
Utilize contact angle measurement measurement contact angle now, obtaining result is 5.9 degree, sees Fig. 1 and Fig. 2, therefore, can say that surface is now ultra-hydrophilic surface.
Embodiment 3
The too sour strontium single-chip of the 10mm*5mm after selecting a slice to clean, is fixed on smooth potsherd, is placed in the focus of laser instrument.Regulate galvanometer parameter, make line be spaced apart 170 microns, run galvanometer, regulate sample, open the light, rerun galvanometer, and obtaining live width is 50 microns, and line centre distance is the surface topography of 170 microns.
Utilize contact angle measurement measurement contact angle now, obtaining result is 5.8 degree.Therefore, can say that surface is now ultra-hydrophilic surface.
Embodiment 4
The too sour strontium single-chip of the 10mm*5mm after selecting a slice to clean, is fixed on smooth potsherd, is placed in the focus of laser instrument.Regulate galvanometer parameter, make line be spaced apart 180 microns, run galvanometer, regulate sample, open the light, rerun galvanometer, and obtaining live width is 50 microns, and line centre distance is the surface topography of 180 microns.
Utilize contact angle measurement measurement contact angle now, obtaining result is about 20 degree.
Embodiment 5:
The too sour strontium single-chip of the 10mm*5mm after selecting a slice to clean, is fixed on smooth potsherd, is placed in the focus of laser instrument.Regulate galvanometer parameter, make line be spaced apart 190 microns, run galvanometer, regulate sample, open the light, rerun galvanometer, and obtaining live width is 50 microns, and line centre distance is the surface topography of 190 microns.
Utilize contact angle measurement measurement contact angle now, obtaining result is about 25 degree.
Embodiment 6
The too sour strontium single-chip of the 10mm*5mm after selecting a slice to clean, is fixed on smooth potsherd, is placed in the focus of laser instrument.Regulate galvanometer parameter, make line be spaced apart 200 microns, run galvanometer, regulate sample, open the light, rerun galvanometer, and obtaining live width is 50 microns, and line centre distance is the surface topography of 200 microns.
Utilize contact angle measurement measurement contact angle now, obtaining result is 49 degree.The Contact-angle measurement figure of embodiment 2-6 is shown in Fig. 3-7.

Claims (2)

1. utilize picosecond laser to make strontium titanates surface become the method for ultra-hydrophilic surface, utilize the strontium titanate crystals sheet surface line that picosecond laser is cleaning up, obtain super hydrophilic surface, it is characterized in that, comprise the following steps: after strontium titanate crystals sheet is cleaned, be fixed on ceramic sheet, again strontium titanate crystals sheet is placed on the focal position at picosecond laser place, make hot spot at the beginning outside strontium titanate crystals sheet, when not opening the light, run galvanometer, observe direction and the position of hot spot line, and regulate the position of strontium titanate crystals sheet, make one end of strontium titanate crystals sheet and the line parallel waiting to draw, but make the Origin And Destination of laser not on strontium titanate crystals sheet, this can obtain complete line arrangement pattern, after regulating position, open laser instrument, wait for 30 seconds, laser instrument is exported and reaches requirement, at this moment again galvanometer is run, carry out line and obtain line arrangement pattern, in the process, the power of laser instrument is 10 watts, frequency is 100 hertz, the sweep speed of galvanometer is 600-1000 metre per second (m/s), every bar line number of repetition is 15-25 time.
2. utilize picosecond laser to make strontium titanates surface become the method for ultra-hydrophilic surface according to claim 1, it is characterized in that, obtain neat line arrangement pattern in the line of strontium titanate crystals sheet surface, the center distance of live width 50 microns, line-to-line is less than 170 microns.
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CN104646833B (en) * 2014-12-25 2018-09-14 广东工业大学 A kind of laser preparation method on metallic substrates gradient wetting surface
CN106583930A (en) * 2016-12-07 2017-04-26 合肥工业大学 Method for achieving reversible wettability of titanium sheet based on femtosecond laser direct writing
CN107252978A (en) * 2017-05-12 2017-10-17 中国船舶重工集团公司第七二五研究所 A kind of laser preparation method of super hydrophilic titanium alloy heat exchanger plates
CN110029351B (en) * 2018-01-12 2020-12-11 广东工业大学 Super-hydrophilic metal surface micro-nano structure and manufacturing method thereof
CN108147452B (en) * 2018-02-11 2020-07-24 哈尔滨工业大学 Synthetic method and application of size-controllable low-dimensional strontium titanate crystal
CN110170747B (en) * 2019-06-24 2021-05-04 吉林大学 Preparation method of bionic coupling water-collecting aluminum alloy anti-icing surface
CN111673284A (en) * 2020-05-29 2020-09-18 上海工程技术大学 Method for improving wetting and spreading performance of reaction wetting system material

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