KR101110330B1 - Contact angle measuring module and apparatus of measuring surface energy having the same - Google Patents

Abstract

It is an object of the present invention to provide a contact angle measuring module and a surface energy measuring device using the same, which can easily and accurately measure the interfacial tension of a droplet as well as the contact angle formed when the droplet is in contact with a surface to be measured. To this end, the present invention, the main body having an image transmission path opened to the lower side, and having an optical system in the image transmission path, disposed on the surface of the solid to be measured; An applicator inserted from an upper portion of the main body over an intermediate portion of an image transmission path of the main body and having an injection needle at a lower end thereof; An optical system for recognizing and transmitting a scanning needle at a lower end of the applicator, a droplet dropped from a lower end of the scanning needle onto a measurement target surface, and the measurement target surface to a computer; A sample container connected to the applicator and containing a sample liquid supplied to the surface to be measured through the applicator; A pump providing power to supply a sample liquid from the sample container to the applicator; And a control unit for controlling the flow rate of the sample liquid discharged through the injection needle of the lower end of the applicator and the flow rate supplied to the applicator by the pump, and a surface energy measurement device having the same.

Description

Contact angle measuring module and apparatus for measuring surface energy having the same

The present invention relates to a contact angle measuring module and a surface energy measuring apparatus having the same, and more particularly, to easily carry and measure a large-area measurement target, and to measure more precisely. The present invention relates to a contact angle measuring module and a surface energy measuring device having the same, which are applicable to various measurement theories by a user's selection.

Interfacial tension is a general force that tries to reduce the area of an interface when two different states of a substance meet each other. Although used in much the same sense as surface tension, strictly speaking, surface tension refers to the force per unit length acting at the interface between a gas and a liquid, and interfacial tension is a general term. On the other hand, the force acting between the solid and the gas (more precisely the space without the movement of atoms) is referred to as surface energy.

Surface energy of solids is an important indicator of adhesion and adhesion. There is no known method for measuring these surface energy values directly. Only indirect measurement methods have been developed. Most known methods of measuring the surface energy of solids measure the contact angle and calculate surface energy based on them.

In general, the contact angle refers to the angle the liquid has when it is thermodynamically balanced on a solid surface. Atoms or electrons on the solid surface have excessive energy compared to atoms or electrons inside the solid. When liquid comes into contact with this surface, a force is applied to reduce this excess energy. Since ordinary solid surfaces are exposed to air, gas is adsorbed on the solid surfaces. At this time, when the liquid contacts the solid surface, the adsorbed gas is pushed out, and the liquid and the solid are brought into contact for the first time, and the change of free energy occurs due to the new interface.

At the point where the three phases of gas, liquid and solid meet, the surface energy of the solid and the interfacial tension between the solid and the liquid act to form droplets with curved surfaces on the surface of the solid in contact with the liquid, and form a contact angle between the solid and the liquid. do.

Therefore, the most direct method of investigating the surface energy of a solid is to drop a small amount of distilled pure water on the target surface and then measure the contact angle between the water formed through the interaction with the surface and the surface of the solid to be measured. If the contact angle is measured and the interfacial tension of the liquid is known, the surface energy can be calculated using known calculation methods, and hydrophilicity (high surface energy = wetness), hydrophobicity (low surface energy = water repellency), and adhesion, which is the degree of surface activation, The gender and cleanliness can be identified. Thus, through the contact angle measurement, it is possible to improve the performance of the product in various fields such as improving the printing performance due to the wettability of the ink, improving the performance of automotive wax using water repellency, and evaluating the cleanliness of the liquid crystal glass hard disk. In addition, the measurement of the surface energy and contact angle of the solid described above in the field of advanced surface science, such as the optimum interfacial conditions and super-repellent surface for the complexation of heterogeneous materials has been widely made.

However, the conventional surface energy measuring device has the following problems.

Due to the limited space for placing solid specimens in the measuring device, direct measurement of surface energy was difficult in the case of large-area glass substrates widely used in the manufacture of display panels, and it was difficult to measure the specimens separately.

In addition, the setting work of the device takes a lot of time and effort, there is a disadvantage that the use of the device is inconvenient and there is a problem that accurate measurement is difficult.

The present invention is to solve various problems including the above problems, an object of the present invention is the contact angle measurement module that can accurately measure the contact angle formed when the droplets contact on the surface of the solid to be measured, as well as the interfacial tension of the droplets And to provide a surface energy measuring device. In addition, the object of the present invention is a contact angle measurement module that is convenient to carry and install, and can be installed directly on a wide measurement object without measuring a solid specimen even for a large measurement object such as a large-area glass substrate, so that the contact angle can be easily measured. And it is to provide a surface energy measuring device that can measure the surface energy using the same.

An object of the present invention as described above, the main body having an image transmission path opened to the lower side, having an optical system in the image transmission path, disposed on the surface of the solid to be measured;

An applicator inserted from an upper portion of the main body over an intermediate portion of an image transmission path of the main body and having an injection needle at a lower end thereof;

An optical system for recognizing and transmitting a scanning needle at a lower end of the applicator, a droplet dropped from a lower end of the scanning needle onto a measurement target surface, and the measurement target surface to a computer;

A sample container connected to the applicator and containing a sample liquid supplied to the surface to be measured through the applicator;

A pump providing power to supply a sample liquid from the sample container to the applicator; And

It is achieved by providing a contact angle measuring module including a control unit for controlling the flow rate of the sample liquid discharged through the injection needle of the lower end of the applicator and the flow rate supplied to the applicator by the pump.

Here, the injection needle of the applicator is disposed to be movable in the vertical direction relative to the body,

The droplet is sampled at the bottom of the needle, and the needle is lowered so that the droplet is in contact with the surface of the solid to be measured. The image of the droplet spread from the solid surface is transmitted to the computer. The contact angle can be measured.

Here, the applicator contains the sample liquid, so that the droplet of the sample can be formed on the lower end of the injection needle by operating the pump,

While the droplet is formed at the bottom of the injection needle, the droplet may freely fall on the surface to be measured while raising the injection needle.

Here, the applicator,

An outer cylinder having a guide groove formed in a longitudinal direction at an upper end thereof;

It is arranged to be transported in the up and down direction in the fixed cylinder, the lateral projections protruding out of the diameter of the outer cylinder through the guide groove is formed, a hollow portion containing a liquid sample therein is formed and the injection at the bottom A needle may be provided, and an inner cylinder connected to the liquid sample container may be provided.

Here, the automatic loading means may be provided to move the inner cylinder in the vertical direction with respect to the outer cylinder to provide an inertial force to freely drop the droplets formed on the lower end of the injection needle.

Here, the thread for guiding the lateral protrusions is formed on the inner wall, and the up-down grooves are formed on the inner wall to allow the lateral protrusions raised to the upper end to be lowered, and the gear teeth formed on the outside ;

A drive gear meshed with a gear tooth on an outer side of the unloading gear; And

A loading motor for rotating the drive gear,

Rotation of the unloading motor may be controlled by the controller so that the droplets of the lower end of the needle may be freely dropped by the controller.

The main body may include a liquid flow rate control switch, a motor operation indicator light, a pump operation switch flow rate adjustment knob, and an internal LED light amount adjustment screw.

Here, the optical system,

An LED device for illuminating white light in a blocked space inside the main body;

A scattering lens for uniformly scattering the light emitted from the LED element; And

It may include a camera for recognizing the image of the drop dropped to the measurement target surface by the applicator.

In addition, the optical system here,

The reflective mirror may further include a reflector for reflecting an image of the droplet placed on the solid surface of the measurement and pointing toward the camera.

In addition, the optical system here,

The apparatus may further include a light amount adjusting plate rotatably coupled to the main body to adjust a range in which the image of the droplet is recognized by the camera.

In addition, the object of the present invention as described above, one contact angle measuring module having the aforementioned characteristics; And

It is achieved by providing a surface energy measurement device comprising a computer system for displaying an image transmitted from the optical system and calculating surface energy.

Here, the injection needle of the applicator is movable until the user touches the measurement target solid surface downward with respect to the main body when a force is applied, and a spring is installed to return to the original position when the force applied by the user is removed, ,

The droplet is sampled at the bottom of the needle, and the needle is lowered so that the droplet is in contact with the surface of the solid to be measured. The image of the droplet spread from the solid surface is transmitted to the computer. The contact angle can be measured.

The contact angle measuring module and the surface energy measuring device of the present invention have various advantages as follows.

First, it is easy to carry and easy to install, so that even if the size of the solid to be measured is large, the contact angle between the sample liquid and the surface of the solid to be measured and the surface energy of the solid to be measured can be measured.

Second, the user can properly select various known surface energy measurement methods to measure the surface energy, and more accurate measurement is possible.

Third, the size of the measuring device can be made smaller by using a reflector.

Fourth, it is possible to control the flow rate relatively precisely so that even if not skilled in the measurement can be performed accurately without mistakes.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in more detail.

1 is a view schematically showing a configuration of a contact angle measuring module according to the present invention, Figure 2 is a cross-sectional view schematically showing the internal configuration of the contact angle measuring module shown in FIG.

As shown in FIG. 1 and FIG. 2, the contact angle measuring module 200 according to the present invention includes a main body 210, an applicator 250, an optical system, a pump 280, and a controller.

The main body 210 has an image transmission path opened downward, an optical system in the image transmission path, and is disposed on the surface of the solid to be measured. The main body 210 may include a power switch, a power connection part, a liquid flow control switch 212, an operation indicator 213, a pumping switch 211, a flow control knob 214, a light amount adjusting screw 203, and a computer connection part. It can be provided.

The applicator 250 is inserted and disposed over an intermediate portion of the image transmission path of the main body 210 from an upper portion of the main body 210 and has an injection needle 254 at a lower end thereof.

3 is an exploded perspective view showing an example of the configuration of the applicator.

As shown in FIG. 3, the applicator 250 includes: an outer cylinder 255 having a guide groove 255a formed in a longitudinal direction at an upper end thereof; A lateral protrusion 253 is disposed in the outer cylinder 255 so as to be transported in a vertical direction and protrudes outward in a radial direction of the outer cylinder 255 through the guide groove 255a, and a liquid is formed therein. A hollow portion for containing a sample may be formed and an inner cylinder 256 having the injection needle 254 at a lower end thereof may be provided.

In addition, an automatic inertia force is provided around the applicator 250 to move the inner cylinder 256 upward and downward with respect to the outer cylinder 255 so that the droplets formed on the lower end of the injection needle 254 freely fall. Unloading means can be installed.

The automatic loading means may include a loading gear, a drive gear and a loading motor.

4 and 5 are a cross-sectional view and a plan view showing the configuration of the unloading gear, respectively.

As shown in FIGS. 4 and 5, the unloading gear 260 has an inner cylinder conveying hole 263, and the lateral protrusion 253 of the applicator 250 can rise on the inner wall. A screw thread 264 is formed. The inner cylinder 256 is raised while the lateral protrusion 253 is transferred by the rotation of the loading gear 260. A gear tooth 261 is formed outside the loading gear 260 and meshes with the driving gear 270 (FIG. 2). In the unloading gear 260, an up-down groove 262 is formed in the inner wall to allow the lateral protrusion 253 raised to the upper portion of the unloading gear 260 to descend. The lateral protrusion 253 of the inner cylinder 256 is guided along the up-down groove 262 to descend.

The drive gear 270 is engaged with a gear tooth on the outside of the loading gear 260, and its rotation is driven by the loading motor. In this case, the rotation of the unloading motor may be controlled by the controller so that the droplet of the lower end of the injection needle 254 is made by the controller.

In FIG. 3, the loading gear 260 is shown above the upper cap 257 on the upper part of the bare cylinder, but is not assembled to the inner cylinder 256 from the upper part of the upper cap 257, but the outer cylinder. The outer cylinder 255 is assembled while being inserted into the inner cylinder feed hole 263 from the lower side of the (255).

In one unloading operation, the unloading gear 260 may be controlled to rotate by 180 degrees. Such control may be achieved by forming the rotation display unit 265 and the stop display unit 264 on an upper portion of the unloading gear where the gear tooth 261 is formed on the outside. That is, while the stop display unit 264 is displayed at two locations at 180 degree intervals, the position of the stop display unit 264 is determined using a non-contact sensor (for example, an optical sensor) or a contact sensor. Each time it is recognized, it can be rotated by 180 degrees by stopping the rotation of the motor.

Allowing the drop to free fall is an important point when considering the accuracy of the measurement. If the droplet descends downward with acceleration, there is a possibility that it spreads more widely on the surface of the solid to be measured so that the contact angle is different from the angle formed by the properties of the material. Therefore, instead of shaking off the droplets at the end of the injection needle 254 by rapidly moving the applicator 250 downwardly with acceleration, the droplets formed at the end of the injection needle 254 naturally by increasing the acceleration by giving the acceleration upwardly are naturally raised. It is preferable to allow free fall, and in the contact angle measuring module of the present invention, the applicator 250 may be driven to enable such movement.

As described above, the automatic unloading means raises the inner cylinder 256 of the applicator 250 in its normal position, causing the droplets to unload and the inner cylinder 256 of the applicator 250 back to its original position. . The inner cylinder 256 can also be conveyed in a downward direction in a normal position. Transfer in the downward direction can be made to the extent that the injection needle 254 can reach the solid surface to be measured, and the force of this transfer is achieved by the user pressing the inner cylinder 256 downward. In addition, the return to the home position may be made by the elastic force of the spring 259 disposed between the outer lower portion of the inner cylinder 256 and the inner lower portion of the outer cylinder 255. The spring 259 is disposed between the inner lower end of the outer cylinder and the outer lower end of the inner cylinder as shown in FIG. 2. As such, since the inner cylinder 256 may move downward, the injection needle 254 provided at the lower end of the inner cylinder 256 may move upward and downward with respect to the main body 210.

The configuration of the optical system is shown in FIG.

As shown in FIG. 2, the optical system includes an LED device 190 that emits white light in a blocked space inside the main body 210, and a scattering lens that uniformly scatters the light emitted from the LED device 190 ( 160, a camera 121 that recognizes an image of the drop dropped on the surface to be measured by the applicator 250, and a reflector 130 that reflects the image so that the image of the drop may be recognized by the camera 121. It includes.

The LED element 190 may be a white LED element, or a red, green, blue LED element may be used together to emit white light. When the white LED device is used as the LED device, two or more LED devices may be arranged in the direction of the surface depth of FIG. 2.

The scattering lens 160 scatters the light emitted from the LED element 190 so that the background of the liquid droplet and the solid surface to be measured by the camera is a bright screen of white light.

The camera 121 may be a CMOS camera. In the background of the scattering lens 160, an image of the lower surface of the needle 254, the droplet 10, and the measurement target solid surface in contact with the droplet may be captured by a computer. Function to transmit.

The reflector 130 functions to change the optical path for recognizing the image of the droplet 10 and the surface of the solid to be measured so as to be directed to the camera 121. By using the reflector 130, the entire contact angle measuring module 200 may be manufactured more compactly.

Meanwhile, as illustrated in FIG. 2, the light amount control plate 170 may be disposed between the droplet 10 placed on the surface of the solid to be measured and the scattering lens 160. The light amount adjusting plate 170 is rotated by the light amount adjusting screw 103 (see FIG. 1) which can be rotated outside the main body 110 to adjust the amount of light of the LED element 190 recognized by the camera 121. Adjust.

The optical system having the above-described configuration recognizes the injection needle 254 at the lower end of the applicator 250, the droplet dropped on the measurement target surface from the lower end of the injection needle 254, and transmits the measurement target surface to a computer. do.

The contact angle measuring module 200 described above may be actually sold with software installed and driven on a computer. The surface energy measuring apparatus referred to in the present invention is used to include software installed and utilized in a computer together with the contact angle measuring module 200 of the present invention. In practice, the surface energy measuring device may be used with a computer system including a computer itself for executing software and performing calculations, and a monitor for displaying measurement data and the like.

The computer system displays an image transmitted from the optical system and calculates surface energy. The computer system includes an image of an optical system and a monitor capable of displaying various menus or calculation results provided by software. In addition, software for calculating the contact angle, dynamic contact angle, interfacial tension of the target liquid, etc. from the image of the optical system, and software for calculating the surface energy of the measurement target solid from information such as contact angle, dynamic contact angle, and interfacial tension of the sample liquid, Include.

On the other hand, the pump 280 functions to supply a sample liquid into the applicator 250. For example, sample liquid may be filled in the inner cylinder of the applicator by the action of the pump from an external sample source.

The controller may control the operation of the pump, the automatic unloading means and the operation indicator according to a user setting and operating a power switch, a pumping switch, a flow control switch, a flow control knob, and the like.

On the other hand, the liquid sample contained in the hollow portion of the inner cylinder may be supplied to the inner cylinder by a pump along the hose from the sample container 251 is additionally installed in the body. That is, the contact angle measuring module according to the present invention may include a sample container 251 disposed outside the main body, a pump disposed inside or outside the main body, and a control unit for controlling the operation of the pump.

The sample container 251 is a member containing a sample liquid supplied to the surface to be measured through the applicator 250. The sample container 251 is arranged to communicate with the inner cylinder 256 through a hose 252 connected to a hose connecting hole 257a formed in the upper cap 257 of the upper end of the inner cylinder of the applicator 250. Can be.

In this case, the pump 280 functions to provide power for supplying the sample liquid from the sample container 251 to the applicator 250. In addition, when the pump is operated in a state in which the sample liquid is contained in the applicator 250 by the pump 280, droplets of the sample may be formed at the lower end of the injection needle 254. This droplet can freely fall on the surface to be measured by inertia when the needle 254 is rapidly accelerated and raised.

In this case, the controller functions to control the flow rate of the sample liquid discharged through the injection needle 254 at the lower end of the applicator and the flow rate supplied to the applicator 250 by the pump. In addition to the control unit may perform a function for controlling the automatic loading means at the same time.

Hereinafter, the method of measuring the surface energy of a solid surface using the surface energy measuring apparatus of this invention is demonstrated briefly.

6 shows a capture view of a program running on a computer for use of the surface energy measurement device of the present invention. Description of each menu and window shown in FIG. 6 is as follows.

A. Menu bar: Provides measuring method, icon display, environment setting, calculator function

B. Icon Menu Bar: provides image, data loading, image saving, environment setting, calibration, calculator, surface energy measurement

C. Live Windows: Display live image in real time

D. Analysis Windows: Display video image of measured result

E. View Windows: Display information of data file, water drop slope, and provide the function to select measurement method automatically or manually.

F. Option Windows: Display manual measurement data and select the surface tension measurement function of the liquid.

G. Graph Windows: The measured value is displayed on the graph.

H. Data Windows: The measured contact angle is displayed and the function to save as an Excel file is provided.

I. Control icon bar: Provides software operation and measurement function

The surface energy can be measured by connecting the contact angle measurement module of the present invention with a computer on which software providing the above functions is installed.

First, the main body 210 of the measuring device of the present invention is placed on the surface of the solid to be measured. The camera installed in the main body 210 displays the appearance of the surface of the solid to be measured from the lower end of the applicator 250 in a live window window on the screen of the connected computer.

The prepared sample is placed in the sample container 251, and after adjusting the flow rate adjusting knob, the pumping switch is operated so that the liquid in the sample container 251 is supplied to the applicator 250 through a hose. When the sample liquid is filled in the inner cylinder 256 of the applicator 250, the liquid is loaded onto the surface of the solid to be measured through the injection needle 254.

The pumping switch may be configured to perform other operations depending on whether the momentary press or long press. For example, when the pumping switch is pressed for a long time, the liquid in the sample container 251 is supplied to the applicator 250 and subsequently drives the automatic loading means to form a sample attached to the lower injection needle 254 in the applicator 250. An appropriate amount of liquid can be loaded on the surface of the solid to be measured.

When the sample liquid is dropped to form a contact angle with the surface of the solid to be measured, an optical camera recognizes and displays an image of the surface of the solid to be measured in contact with the droplet and displays it on a computer monitor. After analyzing the image on the monitor to measure the contact angle, the surface energy of the solid may be calculated by considering the contact angle value and the interfacial tension of the sample liquid.

For example, the (i) Young's equation described in Equation 1 below may be used to calculate the surface energy value of a solid, and the (ii) Good Girifalco Method described in Equation 2 below may be used.

[Equation 1]

γ _LV cosθ = γ _SV -γ _SL

Here, γ _LV is the interface tension between the liquid and gas, θ is the contact angle, γ _SV is the surface energy between the solid and gas, γ _SL is the interface tension between the solid and liquid.

[Equation 2]

γ _s = γ _LV (1 + cosθ) ² / 4φ, (φ = 1)

Where γ _s is the surface energy of the solid, γ _LV is the interface tension between the liquid and the gas, and θ is the contact angle.

Other known are (iii) Fowkes' Method, (iv) Owens, Wendt, and Kaelble's Method (two-component Geometric method), (v) Wu's Method (two-component Harmonic method), (vi) Lifshitz-van der Waals Acid- Base Theory (3-acid Acid-Base method) can be used. In the measuring device of the present invention, the user can select a desired method to be applied in consideration of the characteristics of each surface energy measuring method.

In the surface energy measuring apparatus of the present invention, a line corresponding to an interface between a solid and a liquid is automatically drawn by recognizing an image on a screen, and the contact angle at the point where the droplet, the solid and the gas meet on the basis of the line is automatically determined by the computer. Can be calculated. Alternatively, in some cases, a line corresponding to the interface between the solid and the liquid may be manually drawn in the image on the computer screen, and the protractor may be visually measured on the screen of the computer. In addition, by inserting an image of a protractor that can be moved on the computer screen, it can be measured by moving it to the point where the three phases meet. In this sense, the scope of the present invention may include a case in which a computer (computing device) including an automatic calculation algorithm of a contact angle is not included.

Hereinafter, a method of measuring the interfacial tension of a liquid sample will be described with reference to FIG. 7.

If the value of the interfacial tension of a liquid sample is known at a given temperature and pressure condition, the value can be reflected in a computer and used to calculate the final surface energy value. Otherwise, the surface energy measuring device of the present invention can be used Interfacial tension can be measured.

While watching the image of the lower end of the injection needle 254 in the live window on the computer screen, the droplet of the sample liquid is held at the lower end of the injection needle 254, and then the interface tension of the liquid sample can be measured by recognizing the image of the droplet. have.

That is, FIG. 7 is a capture view showing the liquid droplets of the liquid sample at the lower end of the injection needle 254 displayed on the computer screen in the surface energy measuring device of the present invention.

As shown in FIG. 7, droplets are formed on the injection needle 254, and an image of this state is transmitted to the computer. The interfacial tension of a liquid sample can be calculated by utilizing the information obtained from this image and using a known pendant drop interface tension measuring method. A known pendant drop method for measuring interfacial tension is described in the following paper.

"Use of the pendant drop method to measure interfacial tension between molten polymers", Materials Research, Vol. 2, No. 1, 23-32, 1999. Emerson Y. Arashiro, Nicole R. Demarquette.

When the interfacial tension of the liquid sample is not known, the interfacial tension may be measured as described above. In this process, the surface energy measuring apparatus of the present invention may automatically obtain a measurement result by a simple procedure as follows. For example, when the pumping switch is briefly pressed, the operation indicator blinks so that only the sample of the set flow rate is discharged toward the lower end of the injection needle 254. When discharged in this manner, droplets are formed at the bottom of the injection needle 254 in a state as shown in FIG. 7. Based on the image at this time, the information may be taken to calculate the interfacial tension of the liquid sample.

Hereinafter, a method of measuring a dynamic contact angle using the surface energy measuring apparatus according to the present invention will be described with reference to FIG. 8.

8 is a capture view of a computer monitor screen showing a method of measuring a dynamic contact angle in the surface energy measurement device of the present invention.

As shown on the left in FIG. 8, the droplets form at the end of the injection needle 254, and then the injection needle 254 is lowered so that the droplet contacts the solid surface to be measured. When the droplets touch the solid surface to be measured, a phenomenon occurs that spreads from the solid surface. An image of this state can be transmitted to the computer, and when the angle between the droplet and the solid surface to be measured is measured, this becomes the dynamic contact angle.

In the following description of the present invention, the embodiments illustrated in the drawings have been described with reference to the embodiments, which are merely exemplary, and various modifications and equivalent other embodiments are possible to those skilled in the art. I will understand the point. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

1 is a perspective view schematically showing the appearance of a contact angle measuring module according to the present invention.

2 is a cross-sectional view schematically showing the internal configuration of the contact angle measuring module shown in FIG.

3 is an exploded perspective view showing an example of the configuration of the applicator.

4 is a cross-sectional view taken along the line IV-IV of FIG.

5 is a plan view of the unloading gear shown in FIG.

6 is a capture view of a program running on a computer for use of the surface energy measurement device of the present invention.

7 is a capture view showing the appearance of droplets of a liquid sample at the bottom of the injection needle displayed on a monitor of a computer in the surface energy measuring device of the present invention.

8 is a captured view of a computer monitor screen showing a method of measuring a dynamic contact angle in the surface energy measuring device of the present invention.

<Explanation of symbols for the main parts of the drawings>

10: drop 121: camera

130: reflector 160: scattering lens

170: light control panel 190: LED lamp

200: contact angle measurement module 203: light amount adjustment screw

210: main body 211: pumping switch

212: flow control switch 213: operation indicator

214: flow adjustment knob 250: applicator

251: sample container 252: hose

253: lateral projection 254: injection needle

255: outer cylinder 255a: guide slot

256: inner cylinder 257: upper cap

257a: hose connector 259: spring

260: unloading gear 261: gear tooth

262: vertical groove 263: inner cylinder feed hole

264: thread 264: stop display

265: rotation display unit 270: drive gear

280: pump

Claims (12)

A main body having an image transmission path opened downward and having an optical system in the image transmission path and disposed on a surface of a solid to be measured; An applicator inserted from an upper portion of the main body over an intermediate portion of an image transmission path of the main body and having an injection needle at a lower end thereof; An optical system for recognizing and transmitting a scanning needle at a lower end of the applicator, a droplet dropped from a lower end of the scanning needle onto a measurement target surface, and the measurement target surface to a computer; A sample container connected to the applicator and containing a sample liquid supplied to the surface to be measured through the applicator; A pump providing power to supply a sample liquid from the sample container to the applicator; And A control unit for controlling the flow rate of the sample liquid discharged through the injection needle of the lower end of the applicator and the flow rate supplied by the pump to the applicator, The injection needle of the applicator is movable in the downward direction with respect to the main body when the user applies a force until it touches the measurement target solid surface, characterized in that the spring is installed to return to the original position when the user applied force is removed Contact angle measurement module. delete The method of claim 1, The applicator contains the sample liquid, so that the droplet of the sample can be formed on the lower end of the injection needle by operating the pump, The contact angle measurement module, characterized in that the droplet free fall on the surface to be measured while raising the injection needle in the state in which the droplet is formed at the lower end of the injection needle. The method of claim 1, The applicator, An outer cylinder having a guide groove formed in a longitudinal direction at an upper end thereof; It is arranged to be transported in the vertical direction in the outer cylinder, the lateral projection protruding out of the diameter of the outer cylinder through the guide groove is formed, a hollow portion containing a liquid sample therein is formed and the injection needle at the bottom And an inner cylinder connected to the liquid sample container. 5. The method of claim 4, And an automatic loading means for moving the inner cylinder upward and downward with respect to the outer cylinder to provide an inertial force for freely falling droplets formed on the lower end of the injection needle. The method of claim 5, An unloading gear having a screw thread for guiding the lateral protrusions formed in the inner wall, and having an up-down groove formed in the inner wall for allowing the lateral protrusions raised to the upper end thereof to descend downward; A drive gear meshed with a gear tooth on an outer side of the unloading gear; And A loading motor for rotating the drive gear, The rotation of the unloading motor is controlled by the control unit, the contact angle measuring module, characterized in that the liquid free fall of the lower end of the injection needle by the control unit. The method of claim 1, The main body has a liquid flow control switch, a motor operation indicator, a pump operation switch, a flow control knob, the internal LED light amount adjusting screw, characterized in that the contact angle measuring module. The method of claim 1, The optical system, An LED device for illuminating white light in a blocked space inside the main body; A scattering lens for uniformly scattering the light emitted from the LED element; And And a camera for recognizing the image of the drop dropped on the surface to be measured by the applicator. The method of claim 8, The optical system, The contact angle measurement module, characterized in that it further comprises a reflector for reflecting the image of the droplet placed on the surface of the measurement mass. The method of claim 8, The optical system, And a light amount adjusting plate rotatably coupled to the main body to adjust a range in which the image of the droplet is recognized by the camera. A contact angle measuring module according to any one of claims 1 to 10; And And a computer system for displaying an image transmitted from the optical system and for calculating surface energy. The method of claim 11, The injection needle of the applicator is movable in the downward direction with respect to the main body when the user applies a force until it reaches the measurement target solid surface, and is provided with a spring for returning to the original position when the force applied by the user is removed, The droplet is sampled at the bottom of the needle, and the needle is lowered so that the droplet is in contact with the surface of the solid to be measured. The image of the droplet spread from the solid surface is transmitted to the computer. Surface energy measuring device, characterized in that for measuring the contact angle.

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