CN114062203A - Functional surface super-hydrophobic performance testing device and using method thereof - Google Patents
Functional surface super-hydrophobic performance testing device and using method thereof Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 71
- 230000003075 superhydrophobic effect Effects 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims description 11
- 239000007788 liquid Substances 0.000 claims abstract description 41
- 238000012546 transfer Methods 0.000 claims abstract description 9
- 238000005259 measurement Methods 0.000 claims abstract description 8
- 230000005540 biological transmission Effects 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 15
- 239000000523 sample Substances 0.000 claims description 14
- 238000002474 experimental method Methods 0.000 claims description 10
- 239000012085 test solution Substances 0.000 claims description 8
- 238000011056 performance test Methods 0.000 claims description 5
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 238000011160 research Methods 0.000 abstract description 4
- 230000002209 hydrophobic effect Effects 0.000 description 7
- 238000001179 sorption measurement Methods 0.000 description 6
- 230000005484 gravity Effects 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
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- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010330 laser marking Methods 0.000 description 1
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- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N13/02—Investigating surface tension of liquids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
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- G01N2013/0208—Investigating surface tension of liquids by measuring contact angle
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Abstract
The invention provides a functional surface super-hydrophobic performance testing device which comprises a test bed base, a test bed, a bubble level meter, a transverse adjusting device, a longitudinal adjusting device, a vertical adjusting device, a liquid transfer machine clamping device and a micron liquid transfer machine. The functional surface super-hydrophobic performance testing device provided by the invention has the advantages that the leveling device and the bubble level meter are matched for use, so that the measurement accuracy is ensured; the vertical screw used for controlling the pipettor to move up and down adopts a grinding ball screw, so that the liquid level control device has the advantages of high precision, long service life and high efficiency; the used stepping motor is matched with a large gear, a small gear and a high-precision gear with low backlash to control the torque, so that the torque can be increased, the allowable inertia can be improved, and the vibration of the motor can be reduced; the servo motor is used for controlling the pipettor clamping device to move up and down, and can accurately control the start and stop of the pipettor clamping device; the precision is relatively good, and the scientific research requirements can be met.
Description
Technical Field
The invention belongs to the technical field of functional surfaces, and relates to a functional surface hydrophobic performance testing device and a using method thereof.
Background
In recent years, the hydrophobicity of a functional surface becomes a hot spot of research, hydrophobic materials, particularly super-hydrophobic materials, have an important role in the field of functional materials, but currently adopted measurement methods are all measured by contact angles, the materials are hydrophobic materials when the contact angle is larger than 90 degrees, and super-hydrophobic materials such as DSA-X Plus and the like when the contact angle is larger than 150 degrees. Therefore, a simple and easy-to-learn hydrophobic property testing device and method are needed to solve the above problems.
Disclosure of Invention
The invention aims to provide a device and a method for testing the superhydrophobic performance of a functional surface, aiming at the defects of high price, complex operation and the like of the superhydrophobic performance test of the functional surface in the prior art.
The technical scheme adopted by the invention is as follows: a functional surface super-hydrophobic performance testing device comprises a test bed base, a test bed and a bubble level meter, a transverse adjusting device, a longitudinal adjusting device, a vertical adjusting device, a pipettor clamping device and a micron pipettor, wherein the test bed is arranged on the test bed base, the bubble level meter is arranged on the test bed, the transverse adjusting device is arranged on the test bed, the longitudinal adjusting device is arranged on the transverse adjusting device, the transverse adjusting device can drive the longitudinal adjusting device to transversely move, the vertical adjusting device is arranged on the longitudinal adjusting device, the vertical adjusting device can drive the vertical adjusting device to longitudinally move, the pipettor clamping device is arranged on the vertical adjusting device, the vertical adjusting device can drive the pipettor clamping device to move along the direction vertical to the test bed, the micrometer pipettor is clamped on the pipettor clamping device, the transverse adjusting device comprises two transverse lead screws which are arranged on the test bed in parallel, the input end of the transverse screw rod is connected with a transverse driving motor in a transmission way, a transverse screw rod nut is arranged on the transverse screw rod, a longitudinal driving plate is fixed on the transverse lead screw nut, a longitudinal lead screw vertical to the transverse lead screw is arranged on the longitudinal driving plate, the input end of the longitudinal screw rod is connected with a longitudinal driving motor in a transmission way, a longitudinal screw rod nut is arranged on the longitudinal screw rod, a vertical driving plate is arranged on the longitudinal screw nut, a vertical screw vertical to the test bed is arranged on the vertical driving plate, the input end of the vertical screw is in transmission connection with a vertical driving motor, a vertical screw nut is mounted on the vertical screw, and the vertical screw nut is connected with the pipettor clamping device.
The vertical screw adopts a grinding ball screw, and has the advantages of high precision, long service life and high efficiency.
Furthermore, every horizontal lead screw's both sides parallel arrangement has horizontal direction feed rod, install horizontal slider on the horizontal direction feed rod, horizontal slider with horizontal lead screw nut is connected.
Further, the longitudinal driving plate comprises two parts which are respectively fixed on the transverse screw nuts on the two transverse screws of the transverse adjusting device, longitudinal guide feed bars are arranged on two sides of the longitudinal screw in parallel, two ends of the longitudinal screw and two ends of the longitudinal guide feed bars are respectively installed on the two parts of the longitudinal driving plate, a longitudinal sliding block is installed on the longitudinal guide feed bars, and the longitudinal sliding block is connected with the longitudinal screw nuts.
Furthermore, perpendicular direction feed rod is equipped with in parallel on the both sides of perpendicular lead screw, install perpendicular slider on the perpendicular direction feed rod, perpendicular slider with perpendicular screw nut connects.
Further, a leveling device is arranged between the test bed and the test bed base.
Further, the transverse driving motor and the longitudinal driving motor are stepping motors, the vertical driving motor is a servo motor, the transverse driving motor is connected with the transverse lead screws and the longitudinal driving motor is connected with the longitudinal lead screws through gear transmission, and the vertical driving motor is connected with the vertical lead screws through shaft couplings in a transmission mode. The stepping motor is matched with a large gear, a small gear and a high-precision low-backlash gear for transmission, and through torque control, the torque can be increased, the allowable inertia can be improved, and the vibration of the motor can be reduced; because the servo motor runs very smoothly, and the phenomenon of vibration does not occur even at a low speed, the servo motor is used for controlling the pipettor clamping device to move up and down, so that the start and stop of the pipettor clamping device can be accurately controlled (the moving amount of the track is 0.1mm, namely 1/10 circles are rotated by the motor); the precision of the liquid drop of the micrometer liquid transfer device used for measurement is 0.5 mu L, the precision is relatively good, and the scientific research requirements can be met.
The invention also provides a use method of the functional surface superhydrophobic performance test device, which comprises the following steps:
firstly, adjusting a leveling device between the test bed and the test bed base, and enabling the test bed to reach a horizontal state by observing the bubble level meter;
secondly, placing a test material on the test bed;
thirdly, carrying out a pre-experiment, and recording the volume V of the test solution droplets naturally dropping from the micrometer pipettor;
a fourth step of positioning the micropipette in a suitable position above the pattern material by controlling the transverse driving motor and the longitudinal driving motor;
fifthly, controlling the distance between the micrometer liquid moving device and the sample material to be gradually increased by controlling the vertical driving motor, adjusting the volume of liquid drops dropped by the micrometer liquid moving device at the same time until the liquid drops are adhered to the surface of the sample material, and recording the volume V1 of the liquid drops of the test solution at the moment;
and sixthly, repeating the fifth step, and recording the average value of the volume V1 of the test solution liquid drop at the data measurement positions for multiple times.
Advantageous effects
The functional surface super-hydrophobic performance testing device provided by the invention can ensure that the experiment is carried out in a horizontal state and the accuracy of measurement is ensured because the leveling device is matched with the bubble level meter; the vertical screw rod used for controlling the pipettor to move up and down in the device adopts a grinding ball screw rod, and has the advantages of high precision, long service life and high efficiency; the stepping motor used by the device is matched with a large gear and a small gear which have high precision and low backlash, and the torque is controlled, so that the torque can be increased, the allowable inertia can be improved, and the vibration of the motor can be reduced; because the servo motor runs very smoothly, and the phenomenon of vibration does not occur even at low speed, the device uses the servo motor to control the pipettor clamping device to move up and down, and can accurately control the start and stop of the pipettor clamping device (the moving amount of the track is 0.1mm, namely the motor rotates 1/10 circles); the precision of the liquid drop of the micrometer liquid transfer device used for measurement is 0.5 mu L, the precision is relatively good, and the requirements of scientific research can be met.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention;
FIG. 2 is a schematic diagram of the force applied to a droplet in an embodiment of the present invention;
FIG. 3 shows the results of contact angle measurements taken on samples according to examples of the present invention;
wherein: 1 is a test bed base; 2 is a test bed; 3 is a bubble level meter; 4, a liquid shifter clamping device; 5 is a micrometer liquid transfer device; 6 is a transverse screw rod; 7 is a transverse driving motor; 8 is a transverse screw nut; 9 is a longitudinal driving plate; 10 is a longitudinal screw; 11 is a longitudinal driving motor; 12 is a longitudinal screw nut; 13 is a vertical driving plate; 14 is a vertical screw; 15 is a vertical screw nut; 16 is a transverse guide polished rod; 17 is a transverse sliding block; 18 is a transverse guide polished rod; 19 is a transverse sliding block; 20 is a vertical guide light bar; 21 is a vertical slide block; 22 is a leveling device; and 23 is a vertical driving motor.
Detailed Description
The functional surface superhydrophobic performance testing apparatus provided by the invention will be further described in detail with reference to the accompanying drawings and specific implementation.
As shown in fig. 1, a functional surface superhydrophobic performance testing device includes a test bed base 1, a test bed 2, a bubble level meter 3, a horizontal adjusting device, a vertical adjusting device, a pipettor clamping device 4, and a micro pipettor 5, where the test bed 2 is disposed on the test bed base 1, the bubble level meter 3 is disposed on the test bed 2, the test bed 2 is provided with the horizontal adjusting device, the horizontal adjusting device is provided with the vertical adjusting device, the horizontal adjusting device can drive the vertical adjusting device to move horizontally, the vertical adjusting device is provided with the vertical adjusting device, the vertical adjusting device can drive the vertical adjusting device to move vertically, the pipettor clamping device 4 is provided on the vertical adjusting device, the vertical adjusting device can drive the pipettor clamping device 4 to move in a direction perpendicular to the test bed 2, the micrometer pipettor 5 is clamped on the pipette clamping device 4, the transverse adjusting device comprises two transverse screws 6 arranged on the test bed 2 in parallel, the input end of each transverse screw 6 is connected with a transverse driving motor 7 in a transmission manner, each transverse screw 6 is provided with a transverse screw nut 8, each transverse screw nut 8 is fixed with a longitudinal driving plate 9, each longitudinal driving plate 9 is provided with a longitudinal screw 10 perpendicular to the corresponding transverse screw 6, the input end of each longitudinal screw 10 is connected with a longitudinal driving motor 11 in a transmission manner, each longitudinal screw 10 is provided with a longitudinal screw nut 12, each longitudinal screw nut 12 is provided with a vertical driving plate 13, each vertical driving plate 13 is provided with a vertical screw 14 perpendicular to the test bed 2, and the input end of each vertical screw 14 is in transmission connection with a vertical driving motor 23, the vertical screw 14 is provided with a vertical screw nut 15, and the vertical screw nut 15 is connected with the pipette clamping device 4.
Every horizontal lead screw 6's both sides parallel arrangement has horizontal direction feed rod 16, install horizontal slider 17 on the horizontal direction feed rod 16, horizontal slider 17 with horizontal lead screw nut 8 is connected.
The longitudinal driving plate 9 comprises two parts, the two parts are respectively fixed on the transverse screw nuts 8 on the two transverse screws 6 of the transverse adjusting device, longitudinal guide optical bars 18 are arranged on two sides of the longitudinal screw 10 in parallel, two ends of the longitudinal screw 10 and the longitudinal guide optical bars 18 are respectively installed on the two parts of the longitudinal driving plate 9, a longitudinal sliding block 19 is installed on the longitudinal guide optical bars 18, and the longitudinal sliding block 19 is connected with the longitudinal screw nut 12.
And vertical guide polished rods 20 are arranged on two sides of the vertical screw rod 14 in parallel, vertical sliding blocks 21 are mounted on the vertical guide polished rods 20, and the vertical sliding blocks 21 are connected with the vertical screw nut 15.
A leveling device 22 is arranged between the test bed 2 and the test bed base 1.
The transverse driving motor 7 and the longitudinal driving motor 11 are stepping motors, the vertical driving motor 23 is a servo motor, the transverse driving motor 7 is connected between the transverse lead screws 6 and the longitudinal driving motor 11 is connected between the longitudinal lead screws 10 through gear transmission, and the vertical driving motor 23 is connected between the vertical lead screws 14 through shaft coupling transmission.
In this embodiment, the specimen mount 2 can accommodate the test material 24 with a maximum dimension of 20 × 20cm2, and the minimum area of the test area is a circle with a diameter of 0.5mm and an area of pi/4 mm 2; two sets of transverse screw rods 6-transverse driving electric motors 7-gear assemblies for controlling transverse movement are arranged on two sides of the sample table 2, the transverse driving motors 7 are connected with small gears, and the small gears are connected with large gears to realize transverse movement of the pipette clamping device 5; a set of said longitudinal adjustment means controlling the longitudinal movement of said pipette gripping means 4 is mounted opposite said level vial 3, the movement principle of which is the same as that of said transverse adjustment means; the pipette gripper 5 is mounted on the longitudinal screw 10-the longitudinal drive motor 11-gear assembly controlling the longitudinal movement and is equipped with the vertical screw 14-the vertical drive motor 23 controlling the vertical movement of the pipette gripper 4; the micropipettor 5 is arranged in the middle of the pipette clamping device 4, the functions of clamping and disassembling the micropipettor 5 are realized through knurling hand-screwed screws, and the sample material 24 is placed on the sample table 2.
Application method
The use method of the functional surface superhydrophobic performance test device comprises the following steps:
firstly, adjusting a leveling device 22 between the test bed 2 and the test bed base 1, and enabling the test bed 2 to reach a horizontal state by observing the bubble level meter 3;
secondly, placing a test material 24 on the test bed 2;
thirdly, carrying out a pre-experiment, and recording the volume V of the test solution droplets naturally dropping from the micropipettor 5;
a fourth step of positioning the micropipette 5 in a suitable position above the pattern material 24 by controlling the transverse driving motor 7 and the longitudinal driving motor 11;
fifthly, controlling the distance between the micropipettor 5 and the sample material 24 to be small and gradually increased by controlling the vertical driving motor 23, adjusting the volume of the liquid drop dropped by the micropipettor 5 at the same time until the liquid drop is adhered to the surface of the sample material 24, and recording the volume V1 of the liquid drop of the test solution;
and sixthly, repeating the fifth step, and recording the average value of the volume V1 of the test solution liquid drop at the data measurement positions for multiple times.
Because the liquid drops are influenced by gravity, a pre-experiment is needed to test the natural dropping volume of the liquid drops;
as shown in fig. 2, the force relationship of the droplet is F-G ═ L;
wherein F is the adsorption force of the micropipettor 5 on the liquid drop, G is the gravity borne by the liquid drop, and L is the adsorption force of the super-hydrophobic surface of the sample on the liquid drop.
The hydrophobic property of the super-hydrophobic surface of the sample determines the size of the adsorption force L, and the better the super-hydrophobic property of the surface is, the smaller the adsorption force on the liquid drop is.
In order to adsorb the liquid drop, the larger the volume of the liquid drop required to be adhered to the surface of the material is, the larger the corresponding gravity G of the liquid drop is, and the adsorption force F of the micropipettor 5 on the liquid drop is unchanged, so that the smaller the adsorption force L of the super-hydrophobic surface on the liquid drop is, and the better the hydrophobic property is proved.
The method used in the scheme is verified through experiments:
preparing six types of super-hydrophobic surfaces with different shapes by using a laser marking machine, six square aluminum alloys with the size of 2 multiplied by 2cm2 and a stearic acid-absolute ethyl alcohol solution; several experiments were performed by the proposed method, resulting in the following data, as shown in table 1:
in the experiment, 3.5 mu L of liquid drops naturally drop from a dropper hole of the micropipette 5 due to gravity; since the minimum liquid ejection volume of the micropipette 5 used is 0.5 μ L, the hydrophobicity of the sample surface having a volume of the sticky-off droplet of 0.5 μ L is the worst; the volume of the water drops adhered to the surface of sample one is 2.5 μ L, which is the largest volume of the water drops adhered to the surface of six materials, and therefore the hydrophobicity is the best. The data of this experiment and the results of the experiment using the contact angle to measure the hydrophobicity of the material are shown in fig. 3, and the trends shown are the same, thus confirming that the hydrophobic property of the surface can be correctly reflected by the detection using the device of the present invention.
The above are merely embodiments of the present invention, which are described in detail and with particularity, and therefore should not be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, all the technical solutions formed by equivalent substitutions or equivalent changes are included in the protection scope of the present invention without departing from the concept of the present invention.
Claims (7)
1. The utility model provides a super hydrophobic performance testing arrangement of functional surface which characterized in that: comprises a test bed base (1), a test bed (2), a bubble level meter (3), a transverse adjusting device, a longitudinal adjusting device, a vertical adjusting device, a liquid transfer machine clamping device (4) and a micron liquid transfer machine (5), wherein the test bed (2) is arranged on the test bed base (1), the bubble level meter (3) is arranged on the test bed (2), the transverse adjusting device is arranged on the test bed (2), the longitudinal adjusting device is arranged on the transverse adjusting device, the transverse adjusting device can drive the longitudinal adjusting device to transversely move, the vertical adjusting device is arranged on the longitudinal adjusting device, the longitudinal adjusting device can drive the vertical adjusting device to longitudinally move, the liquid transfer machine clamping device (4) is arranged on the vertical adjusting device, the vertical adjusting device can drive the liquid transfer machine clamping device (4) to move along the direction vertical to the test bed (2), the micrometer pipettor (5) is clamped on the pipette clamping device (4), the transverse adjusting device comprises two transverse lead screws (6) arranged in parallel on the test bed (2), the input end of each transverse lead screw (6) is in transmission connection with a transverse driving motor (7), each transverse lead screw (6) is provided with a transverse lead screw nut (8), each transverse lead screw nut (8) is fixed with a longitudinal driving plate (9), each longitudinal driving plate (9) is provided with a longitudinal lead screw (10) perpendicular to the transverse lead screws (6), the input end of each longitudinal lead screw (10) is in transmission connection with a longitudinal driving motor (11), each longitudinal lead screw (10) is provided with a longitudinal lead screw nut (12), each longitudinal lead screw nut (12) is provided with a vertical driving plate (13), each vertical driving plate (13) is provided with a vertical lead screw (14) perpendicular to the test bed (2), the input end of the vertical lead screw (14) is in transmission connection with a vertical driving motor (23), a vertical lead screw nut (15) is installed on the vertical lead screw (14), and the vertical lead screw nut (15) is connected with the pipette clamping device (4).
2. The functional surface superhydrophobic performance testing apparatus of claim 1, wherein: every both sides parallel arrangement of horizontal lead screw (6) has horizontal direction feed rod (16), install horizontal slider (17) on horizontal direction feed rod (16), horizontal slider (17) with horizontal lead screw nut (8) are connected.
3. The functional surface superhydrophobic performance testing apparatus of claim 1, wherein: the longitudinal driving plate (9) comprises two parts which are respectively fixed on the transverse screw nuts (8) on the two transverse screws (6) of the transverse adjusting device, longitudinal guide feed bars (18) are arranged on two sides of the longitudinal screw (10) in parallel, two ends of the longitudinal screw (10) and the longitudinal guide feed bars (18) are respectively installed on the two parts of the longitudinal driving plate (9), a longitudinal sliding block (19) is installed on the longitudinal guide feed bars (18), and the longitudinal sliding block (19) is connected with the longitudinal screw nuts (12).
4. The functional surface superhydrophobic performance test apparatus according to claim 1, wherein: the two sides of the vertical screw rod (14) are parallelly provided with vertical guide polished rods (20), vertical sliding blocks (21) are installed on the vertical guide polished rods (20), and the vertical sliding blocks (21) are connected with the vertical screw rod nuts (15).
5. The functional surface superhydrophobic performance testing apparatus of claim 1, wherein: a leveling device (22) is arranged between the test bed (2) and the test bed base (1).
6. The functional surface superhydrophobic performance testing apparatus of claim 1, wherein: the transverse driving motor (7) and the longitudinal driving motor (11) are stepping motors, the vertical driving motor (23) is a servo motor, the transverse driving motor (7) is connected with the transverse lead screws (6) and the longitudinal driving motor (11) is connected with the longitudinal lead screws (10) through gear transmission, and the vertical driving motor (23) is connected with the vertical lead screws (14) through shaft coupling transmission.
7. A method for using the functional surface superhydrophobic performance test apparatus according to any one of claims 1 to 6, comprising:
firstly, adjusting a leveling device (22) between the test bed (2) and the test bed base (1), and enabling the test bed (2) to reach a horizontal state by observing the bubble level meter (3);
secondly, placing a test material (24) on the test bed (2);
thirdly, carrying out a pre-experiment, and recording the volume V of the test solution droplets naturally dropped from the micrometer pipettor (5);
a fourth step of positioning the micropipette (5) in position above the pattern material (24) by controlling the transverse drive motor (7) and the longitudinal drive motor (11);
fifthly, controlling the distance between the micropipettor (5) and the sample material (24) to gradually increase from small to large by controlling the vertical driving motor (23), adjusting the volume of the liquid drop dropped by the micropipettor (5) at the same time until the liquid drop is stuck to the surface of the sample material (24), and recording the volume V1 of the liquid drop of the sample liquid at the moment;
and sixthly, repeating the fifth step, and recording the average value of the volume V1 of the test solution liquid drop at the data measurement positions for multiple times.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116008129A (en) * | 2023-03-28 | 2023-04-25 | 叙镇铁路有限责任公司 | Negative pressure detection device in water distribution is divided to cement-based material surface hydrophobe |
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| CN211602869U (en) * | 2020-01-02 | 2020-09-29 | 河北科技大学 | High-precision testing system for super-hydrophobic material-liquid drop adhesion |
| CN111239005A (en) * | 2020-03-12 | 2020-06-05 | 武汉大学 | Test device and method for synchronously measuring liquid-solid interface interaction and liquid-solid contact area |
| CN111337346A (en) * | 2020-03-13 | 2020-06-26 | 浙江大学 | Micro-mechanics detection device and method |
| CN112268838A (en) * | 2020-10-30 | 2021-01-26 | 江苏科技大学 | Hydrophobic surface performance testing device and characterization method thereof |
| CN113340775A (en) * | 2021-06-22 | 2021-09-03 | 江苏大学 | Material surface contact angle and rolling angle measurement and drop bounce testing device |
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