Colloid photonic crystal printing method based on magnetic field orientation control

A colloidal photonic crystal, orientation control technology, applied in printing, printing process, printing of special varieties of prints, etc., can solve problems such as few reports

Inactive Publication Date: 2012-09-26
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, photonic crystal printing based on changing the lattice constant and effective refractive index has been develo

Method used

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  • Colloid photonic crystal printing method based on magnetic field orientation control
  • Colloid photonic crystal printing method based on magnetic field orientation control
  • Colloid photonic crystal printing method based on magnetic field orientation control

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Synthesis of Colloidal Photonic Crystals

[0026] Raw material FeCl 3 (0.4mmol), surfactant PAA (4mmol) and solvent DEG (16mL) were mixed and heated to 220 degrees Celsius, reacted for one hour under nitrogen protection, injected with an appropriate amount of NaOH / DEG (1.8ml, 2.5mol / L) solution, at 220 The reaction was continued at °C for 1 hour. After the reaction, it was left to cool, washed three times by centrifugation with ethanol and water, and dispersed in 3 ml of deionized water.

[0027] Fe will be produced 3 O 4 The aqueous solution of the colloidal particles was mixed with 20 ml of ethanol and 1 ml of ammonia water, and 0.1 mL of TEOS was injected every 20 minutes under mechanical stirring, and the number of additions was set according to the design size of the colloidal particles. After the reaction is completed, it is washed and separated with ethanol, and the product is dispersed in 3 mL of ethanol to obtain a shell of SiO. 2 , with Fe inside 3 O 4 ...

Embodiment 2

[0029] Orientation-controlled colloidal photonic crystal printing

[0030] The printing process of photonic crystal printing based on magnetic field orientation control is as follows figure 1 As shown, take an appropriate amount of shell as SiO 2 , with Fe inside 3 O 4 The core-shell colloidal particles were removed from the solvent, and dispersed in the same volume of PEGDA and PEGMA mixed solution, the volume ratio between the two was between 1:1 and 1:4, and the photoinitiator DMPA (5wt%) was added at the same time. Ultrasonic dispersion to make photonic crystal printing liquid. Take 25 μL of this solution and place it between the glass substrate and the hydrophobic cover glass with a distance of 230 μm, and place it above the inclined NdFeB magnet. Under the action of an external magnetic field, the magnetic colloidal particles form a chain-like one-dimensional photonic crystal structure, and the crystal The orientation is consistent with the direction of the external ...

Embodiment 3

[0032] Printing Mirror Symmetrically Oriented Photonic Crystal Labels

[0033] Take an appropriate amount of photonic crystal printing solution and place it between the glass substrate and the hydrophobic cover glass with a distance of 280 μm, and place it above the inclined NdFeB magnet, adjust the magnetic field direction to 15°, under the action of the external magnetic field, the magnetic colloidal particles A chain-like one-dimensional photonic crystal structure is formed, and the crystal orientation is consistent with the direction of the external magnetic field. At the same time, the photonic crystal structure and orientation of the selected area were fixed by irradiation under ultraviolet light for 15 seconds using a photomask. Adjust the direction of the external magnetic field to -15° of mirror symmetry, remove the photomask, and cure other areas under UV irradiation to form patterns with "orientation differences". When the angle of the incident light is switched betw...

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Abstract

The invention relates to a colloid photonic crystal printing method based on magnetic field orientation control, which can be used for printing a pattern with'orientation difference' by using a magnetic field to control photonic crystal orientation, rapidly fixing a photonic crystal structure in a selection area through ultraviolet curing, and repeatedly executing an orientation controlling-curing process for times. Compared with the prior art, according to the colloid photonic crystal printing method based on the magnetic field orientation control, a diffraction wavelength of photonic crystal, namely a color, is relative to orientation of a crystal structure, so that specific color distribution of the pattern is displayed in a condition that incident light is consistent to a viewing angle. A photonic crystal label is prepared by using two magnetic fields in mirror symmetry. When an angle of the incident light is switched between two orientations, colors of the pattern and a background can be exchanged. The label printed by a multi-orientation axial-symmetrical magnetic field can display a dynamic effect of moving glow when rotating under sunshine. Furthermore, the colloid photonic crystal printing method further can be used for manufacturing an invisible code with high transparency. Code blocks, which cannot be distinguished by naked eyes, can be accurately identified through a microscope or a spectrograph.

Description

technical field [0001] The invention belongs to the technical fields of colloidal photonic crystal application, printing and anti-counterfeiting, in particular to a colloidal photonic crystal printing method based on magnetic field orientation control. Background technique [0002] Printing based on colloidal photonic crystals is a new type of printing technology, which has important application prospects in the preparation of photonic circuits, reflective display units, outdoor advertising and photonic crystal sensors. Existing colloidal photonic crystal printing techniques can be roughly divided into two categories. The first type uses monodisperse colloidal particles as the ink, combined with traditional inkjet printing technology to print the colloidal ink on the substrate, and the colloidal particles are self-assembled to form a photonic crystal structure after the solvent evaporates. The second type of printing technique forms patterns with reflection differences (con...

Claims

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Application Information

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IPC IPC(8): B41M3/14C09D11/10C09D11/101C09D11/50
Inventor 宣如扬葛建平
Owner TONGJI UNIV
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