KR101732799B1 - Virus self-assembled structure-based highly wrinkle pattern and their fabrication method - Google Patents
Virus self-assembled structure-based highly wrinkle pattern and their fabrication method Download PDFInfo
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- KR101732799B1 KR101732799B1 KR1020150121934A KR20150121934A KR101732799B1 KR 101732799 B1 KR101732799 B1 KR 101732799B1 KR 1020150121934 A KR1020150121934 A KR 1020150121934A KR 20150121934 A KR20150121934 A KR 20150121934A KR 101732799 B1 KR101732799 B1 KR 101732799B1
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B82B3/00—Manufacture or treatment of nanostructures by manipulation of individual atoms or molecules, or limited collections of atoms or molecules as discrete units
- B82B3/0009—Forming specific nanostructures
- B82B3/0038—Manufacturing processes for forming specific nanostructures not provided for in groups B82B3/0014 - B82B3/0033
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- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
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Abstract
An object of the present invention is to provide a highly reliable wrinkle structure by simplified equipment and process based on new materials.
The present invention provides a wrinkle structure which is linearly aligned using a self-assembling virus and which can reliably recover the original shape against expansion and contraction of a substrate, and a method of manufacturing the same. That is, the present invention relates to a method for producing a virus solution, which comprises preparing a virus solution, applying a virus solution with a blade in a state in which the flexible substrate is pulled, releasing the tension by releasing the drawn substrate, to provide.
Description
BACKGROUND OF THE
The wrinkle structure is variously applied to optical elements, display elements, illumination elements, and the like. Therefore, various attempts have been made to fabricate the wrinkle structure. The application of devices to strain sensors or wearable devices is a subject of prior studies where the fabrication of wrinkle structures and the investigation of their characteristics are important because the degree to which the microstructure of the device is restored to its original size do. Korean Patent Registration No. 10-1425524 discloses a method for forming a wrinkle structure on a flexible elastic substrate and then transferring the wrinkle structure onto a curable substrate. However, it does not disclose that the corrugated structure itself restores the original structure on the flexible substrate. "Surface Wrinkling: A Versatile Platform for Measuring Thin-Film Properties, Jun Young Chung et.al., Adv. Mater. 2011, 23, 349-368" also discloses a study on how to make a wrinkle structure. In this case, when a specific pre-strain is applied to the PDMS substrate, a thin SiO 2 thin film is formed through UV-Ozone and O 2 plasma treatment, and the pre-strain applied is released, PDMS A corrugated structure is formed on the surface to eliminate the stress difference formed between the substrate and the SiO 2 thin film. At this time, SiO 2 In the case of a film, a relatively uniform thin film and few defects therein can form a fairly uniform wrinkle structure. However, when a wrinkle structure is formed after coating a metal or an organic material on the surface, a uniform irregularly shaped wrinkle is formed due to a failure of uniform stress dispersion due to defects in the metal or organic film (Buckling of Aligned Carbon Nanotubes as Stretchable Conductors:.. a New Manufacturing Strategy, Yong Zhu and Feng Xu, Adv Mater 2012, 24, 1073.1077 ") is attempting to introduce a simple Photolithography process as a method for forming a uniform wrinkle structure of metals, organic film (Controlled buckling of semiconductor nanoribbons for stretchable electronics, YUGANG SUN, Nature nanotechnology,
Therefore, it is an object of the present invention to provide a highly reliable wrinkle structure by simplified equipment and process based on new materials.
According to the above object, the present invention provides a wrinkle structure which is linearly aligned using a virus having self-assembly ability and can be reliably restored to its original state against expansion and contraction of a base material, and a method for producing the same.
That is, the present invention relates to a method for producing a virus solution, which comprises preparing a virus solution, applying a virus solution with a blade in a state in which the flexible substrate is pulled, releasing the tension by releasing the drawn substrate, to provide.
When the substrate of the corrugated structure is pulled again, the alignment of the virus loses its linearity, but when the tensile force of the pulled substrate is released to return to the original position, the corrugated structure is returned to the linear alignment state.
In the present invention, the concentration of the virus solution, the amount of the virus solution applied to the substrate, and the blade movement speed are controlled to form a preferable wrinkle structure. That is, the present invention relates to a method for producing a virus, which comprises applying 30 to 50 μl, preferably 40 μl, of a virus solution having a concentration of 1 to 7 mg / ml, preferably 3 mg / ml to a substrate on a stretched substrate, min., the virus solution is applied to cause proper evaporation at the three-phase interface between the substrate and the virus solution and the air, thereby inducing self-assembly of the virus to form a uniformly regularly arranged linear wrinkle structure .
In addition, by controlling the concentration of the virus solution, the present invention forms a microstructural structure which becomes various randomly, and becomes uniform as a whole in addition to the linear shape by controlling the concentration of the virus solution.
In addition, the present invention can provide a fingerprint recognition device using a wrinkle structure fabricated using virus self-assembly.
In addition, the present invention can provide a light extracting substrate to which randomly and wholly uniform fine irregular structures made using virus self-assembly are applied.
According to the present invention, the wrinkle structure can be manufactured by a very simple method by utilizing the self-assembly phenomenon of the virus, and the virus wrinkle structure produced by the present invention has strong shape resilience against expansion and contraction of the substrate, A strain sensor, a shape recognition device, and the like.
1 is a schematic view for explaining a method of forming a corrugated structure by applying a virus solution onto a substrate by blade coating according to the present invention.
FIG. 2 is a flowchart for explaining a method of forming a corrugated structure by applying a virus solution onto a substrate by blade coating according to the present invention.
FIG. 3 is a photograph showing that the wrinkle structure using the virus prepared according to the present invention has a different arrangement shape according to the virus solution concentration.
FIG. 4 is a photograph showing that the wrinkle structure using the virus prepared according to the present invention is restored to the expansion and contraction of the substrate.
FIG. 5 is a graph comparing transmittance of the corrugated structure using the virus prepared according to the present invention and transmittance of the substrate PDMS.
6 is a flowchart for explaining a method of making a fingerprint recognition device using a wrinkle structure using virus according to the present invention.
FIG. 7 is a photograph showing a fingerprint recognized by the wrinkle structure using virus according to FIG.
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The M13 phage have lengths from 800 to 1000 nm and widths of a few nm (6.6 nm or less) and are well conditioned to form a linear wrinkle structure due to their high aspect ratio. In addition, the M13 phage is easy to self-grow and can serve as a basic material for the self-assembly process. The self-assembly phenomenon of this M13 firefly can result in a statistically uniform distribution of viruses as they are randomly and individually arranged. As a result, M13 phage is prepared as a solution and applied to a substrate to prepare a virus wrinkle structure.
First, prepare the M13 phage as a solution. In this example, the 4E-type M13 phage was prepared at a concentration of 3 mg / ml in TBS (tris buffered saline) buffer (12.5 mM and 37.5 mM NaCl, pH 7.5). Such a concentration value can be changed as an example, but it can be a concentration of about 1 to 7 mg / ml. Depending on the concentration, the viral arrangement structure may be varied and various wrinkle structures may be formed as needed.
The prepared virus solution is applied to a stretchable substrate, and a PDMS (polydimethylsiloxane) substrate is used in this embodiment. When the flexible substrate is stretched, the virus solution is injected, the solution is slowly applied to the substrate by using the blade, and the force applied to the substrate is released to return the substrate to the original position. FIGS. 1 and 2 show the method of manufacturing such a wrinkle structure easily. FIG. 1 shows that a virus solution is injected onto a substrate and applied with a blade to form a regular linear wrinkle structure by self-assembly of the virus. Fig. 2 shows the manufacturing method of such a wrinkle structure in order.
In order to smoothly coat the PDMS substrate while stretching it, O 2 To form a hydrophilic group through a plasma treatment.
30 to 50 [mu] l, preferably 40 [mu] l of the virus solution at a concentration of 3 mg / ml is put into the substrate, and the virus is transferred by moving the blade at a speed of 200 to 400 [mu] m / min. In the case of this embodiment, it was moved at a speed of 300 mu m / min.
At this time, the interval between the surface of the substrate and the lower end of the blade is maintained at about 0.5 to 2 mm, preferably about 1 mm. Almost simultaneously with or immediately after the coating process, the water contained in the virus evaporates at the three - phase interface between the substrate, virus, and air, causing virus self - assembly and forming a regular linear wrinkle structure.
3 is a photograph of a wrinkle structure by virus self-assembly according to the present invention. When the concentrations of the virus solutions were 1 mg / ml, 3 mg / ml, and 7 mg / ml, the self-assembled state of the viruses were different from each other. At a relatively low concentration of 1 mg / ml, a wrinkle structure was formed near the vertical direction of the blade and an irregular shape was formed. At a high concentration of 7 mg / ml, a wrinkle structure was formed in a direction parallel to the blade advancing direction. However, this irregular arrangement can be regarded as a uniform distribution as a whole. At 3 mg / ml concentration, a very regularly arranged linear wrinkle structure (smectic) was shown. The direction of the corrugation was perpendicular to the advancing direction of the blade, and the width of each of the corrugated bundles was about 1 to 2 mu m.
FIG. 4 shows the difference in virus structure according to the extent of substrate pull in the present invention. In other words, after the viral solution was applied, the degree of pulling of the substrate was 5%, 10%, and 15% relative to the initial substrate, and the wrinkle structure state and the pulling of the substrate were released. Of the wrinkle structure. The somewhat irregular wrinkle structure, which is indicated by the applied virus solution in the initial prestreched state of the substrate, becomes a very regular and uniform wrinkle structure due to the release of the substrate, pulling the substrate back into its initial pulled state The irregular wrinkle structure that appeared at the beginning of Restrech appears again. That is, it can be seen that the virus wrinkle structure according to the present invention is excellent in shape restoring force according to the elongation and shrinkage of the substrate. Such shape restoring force is an important factor for a device applied to a strain sensor or a wearable device, and the virus-based wrinkle structure according to the present invention can have high reliability due to excellent shape restoring force. That is, in the case of the strain sensor, since the reliability of the sensing is excellent when the strain is applied and sensed, and then reset to the initial state when the sensing is performed again after the sensing is performed, the shape stability is an important factor in reliability. Even in a wearable device, the substrate itself is made of a stretchable material, and the devices formed thereon must be able to perform the same operation on the substrate in a constant state. Therefore, the virus substrate of the present invention can satisfy the reliability with the resilience according to the expansion and contraction due to the self-assembling property.
Although the stretch and shrinkage of the substrate was repeated several times in this embodiment, it was confirmed that the shape of the wrinkle structure was still almost the same and the durability was excellent.
As a result of examining the cause of the uniform wrinkle shape of the linear wrinkle structure (Smectic) formed by the self-assembly of the virus, the present inventors have found that the nodule portion of the smectic structure serves as a guide in the formation of wrinkles, It was found that it is possible to obtain a much more uniform wrinkle than the wrinkle structure. In addition, since it is different from the photolithography method used for manufacturing the wrinkle structure using a uniform polymer or metal, the process cost and equipment cost are remarkably low and the process is much simpler. That is, the use of the self-assembly phenomenon of the virus is itself a substitute for complicated equipment and processes.
Figure 5 shows the optical properties of the virus self-assembled construct. The black graph shows the transmittance of the PDMS in the visible region of the PDMS without any treatment. The red graph shows the transmittance of the virus-self assembled structure, . The sample on which the PDMS and the virus self-assembled were not processed had a high transmittance of 90% or more over the whole visible ray region band. However, in the case of the sample having the wrinkled structure, It can be seen that the transmittance is as low as 30% or less over the range of the light ray region.
This transmittance characteristic suggests that irregular wrinkle structures can be applied to display devices, illumination devices, and particularly light extraction substrates for OLEDs. In the case of an OLED, a light source such as a microlens array is disposed due to the problem that light generated from the inside can not escape to the outside, causing internal heat storage to damage the device. Attempts have been made to form nano-irregular sphere bodies such as a so-called bar, a winkle structure and a buckle structure on a substrate. Therefore, an irregular virus self-assembly structure exhibiting a transmittance of about 90% according to the present invention can be applied to a light extraction substrate.
On the other hand, optical characteristics of such a wrinkle structure can be applied variously. One of them is a fingerprint recognition device.
Since the surface of the substrate is treated with a hydrophilic treatment before applying the virus solution to the substrate to form the wrinkle structure, if the finger portion with the fingerprint is brought into contact with the substrate, the hydrophilic treatment is not performed due to the oil. Therefore, since the viral solution is not applied to the fingerprint portion, the virus is self-assembled after the viral solution is applied to the entire substrate, and then the fingerprint portion is changed in response to light (reflection, refraction, diffraction, dispersion, etc.) .
FIG. 6 shows a process of lightly pressing the PDMS substrate with a finger before the process of forming the corrugated structure. As described above, the oil of the finger is transferred to the PDMS, and when the O 2 plasma treatment is performed, the oil is transferred to the portion where the oil is transferred, so that the oil serves as a mask and the hydrophilic group is not formed. Therefore, a virus self-assembly structure is not formed in a portion where a hydrophilic group is not formed in the self-assembly process. 7, it can be seen that the fingerprint is recognized in a state where the substrate on which the fingerprint is taken is stretched and the stretch is released and the virus is self-assembled. In the right photograph, where the regular wrinkle structure was formed by the self-assembly of the virus, the fingerprints appear quite clearly with iridescent backlight. Therefore, the virus wrinkle structure of the present invention can be utilized as a fingerprint recognition device.
In addition to a fingerprint, a QR code, a bar code, or the like may be printed on a stretched substrate to release the stretch after application of the virus solution, thereby producing a display element for displaying a printed QR code, a barcode or the like.
Further, it is possible to fabricate a device that causes an arbitrary pattern to appear or disappear depending on whether the substrate is stretched on the substrate. These devices are likely to be applied in the security field.
It is to be understood that the invention is not limited to the disclosed embodiment, but is capable of many modifications and variations within the scope of the appended claims. It is self-evident.
No reference symbol.
Claims (11)
A stretchable substrate is prepared, the substrate is stretched by pulling it,
The virus solution is placed on the substrate while the substrate is stretched and the virus solution is applied onto the substrate with the blade to form an irregular wrinkle structure,
By releasing extension to the elongated substrate to cause self-assembly of the virus, linear regular wrinkles are arranged on the substrate, and the substrate is pulled back to the initial pulled-back state (Restrech). The irregular wrinkles Thereby causing the structure to reappear.
A stretchable substrate is prepared, the substrate is stretched by pulling it,
The fingerprint is recorded by bringing the finger into contact with the substrate in a state in which the substrate is stretched,
Treating the substrate with oxygen plasma on the elongated substrate to hydrophilize portions other than the fingerprint,
The virus solution is placed on the substrate, the virus solution is applied onto the substrate with the blade,
Wherein the extension of the stretched substrate causes the virus to self-assemble so that linear wrinkles are arranged on the substrate so that a fingerprint portion that does not self-assemble the virus is recognized.
A stretchable substrate is prepared, the substrate is stretched by pulling it,
A predetermined pattern is printed on a substrate with ink containing oil in a state in which the substrate is stretched,
Treating the substrate with an oxygen plasma on the elongated substrate to hydrophilize portions other than the pattern,
The virus solution is placed on the substrate, the virus solution is applied onto the substrate with the blade,
By self-assembly of the virus by releasing extension to the elongated substrate, linear wrinkles are regularly arranged on the substrate, so that the pattern portion in which the virus does not self-assemble is recognized, and when the substrate is stretched, The pattern recognition method comprising the steps of:
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| DE102017218363A1 (en) * | 2017-10-13 | 2019-04-18 | Leibniz-Institut Für Polymerforschung Dresden E.V. | SURFACE-STRUCTURED POLYMERIC BODIES AND METHOD FOR THE PRODUCTION THEREOF |
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| KR101425524B1 (en) * | 2012-07-09 | 2014-08-05 | 한국기초과학지원연구원 | Method for transfering pleated linear microstructure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101425524B1 (en) * | 2012-07-09 | 2014-08-05 | 한국기초과학지원연구원 | Method for transfering pleated linear microstructure |
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| Nature, vol.478, pp.364-368 |
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