RU2804882C1 - Equipment for placement in a test tube configured for placement in the rotor of a centrifuge used to obtain a photonic-crystal colloidal film on a substrate by centrifugation. - Google Patents

Abstract

FIELD: laboratory equipment.

SUBSTANCE: invention relates to equipment for placement in a test tube configured for placement in the rotor of a centrifuge used to obtain a photonic-crystal colloidal film on a substrate by centrifugation. The specified equipment is configured positioning the substrate perpendicular to the longitudinal axis of the test tube and comprises a cone and a filling hole for filling the test tube with a colloidal solution. On the basis of said cone, a table for placing the substrate is installed, connected to the leg, which is connected to the disk, which has three clamps for attaching to the test tube.

EFFECT: possibility of reproducible and efficient production of single-layer or multilayer photonic-crystal colloidal films with a given microstructure due to the deposition of colloidal particles by centrifugation in the developed tooling.

1 cl, 5 dwg

Description

The invention relates to equipment for producing photonic crystal colloidal films by classical centrifugation, and can be used in the technological process of producing thin colloidal films of various topographies (solid, island, monolayer).

The classic centrifugation scheme is that liquid with suspended particles is placed in test tubes, which are mounted on a multi-position rotor and then rotated around its axis. When exposed to a centrifugal field, particles can move and be deposited on the substrate. The kinetic stability of a solution depends on the size, density and shape of the particles (Markelonis A.R., W.J.S., U.B., W.C.M., B.G.J. Nanoparticle film deposition using a simple and fast centrifuge sedimentation method // Applied Nanoscience, Vol. 5, No. 4, 2015. pp. 457-468).

The classical centrifugation method has many current and potential applications. It is interesting because it is currently poorly studied and analyzed from the point of view of obtaining thin films. Solving this problem will enable the fabrication of colloidal films that have a wide range of actual and potential applications, including photonic crystals, photonic glasses, electronic devices, sensitive sensors, macroporous materials, and surface coatings with structural color or specific wettability. However, in the literature there is limited information about the experience of implementing this method for the purpose of obtaining colloidal crystals.

The technical result, when using the claimed invention, is the possibility of reproducible and efficient production of single-layer or multilayer photonic crystal colloidal films with a given microstructure due to the deposition of colloidal particles using the classical centrifugation method in the developed equipment.

The essence of the invention is that the equipment for placement in a test tube, configured to be located in a centrifuge rotor, used to obtain a photonic crystal colloidal film on a substrate by centrifugation, characterized in that it is designed to position the substrate perpendicular to the longitudinal axis of the test tube and contains a cone on the base of which a table is installed for placing the substrate, connected to a leg, which is connected to a disk having three clamps for attachment to the test tube, and a filling hole for filling the test tube with a colloidal solution.

In fig. 1 shows a front view of the equipment (view 1), Fig. 2 – section А-А, in Fig. 3 – side view of the equipment (view 2), in Fig. 4 – image of an isometric projection of a 3D model of a test tube (flask) with equipment with a substrate installed on it, in Fig. 5 – samples of photonic crystal colloidal films.

In this case, the following positions are indicated in the figures:

table – 1,

leg – 2,

disk – 3,

clamp – 4,

cone – 5,

nuts – 6,

screws – 7,

test tube (flask) – 8,

backing – 9.

The equipment includes a table 1, a leg 2, a disk 3, three clamps 4, a cone 5, including those connected to each other by threaded connections (nuts 6 and screws 7). The device parts (except for positions 6 and 7) are made by 3D printing.

The equipment includes a table 1 (Fig. 1), connected to the leg 2 using screws 7 and nuts 6, and the leg 2 is connected to the disk 3 using screws 7 and nuts 6, and the disk 3 (Fig. 3) is connected to three clamps 4 using screws 7 and nuts 6. The equipment is secured to the test tube 8 using three clamps 4 (Fig. 4).

The table 1, leg 2 and disk 3 are made of a material with a level of rigidity that ensures reliable positioning of the equipment in the test tube 8 and the substrate 9 on the equipment, and the material of the clamps 4 has a level of flexibility that provides a long service life of the clamps 4, reliable fixation and convenient removal of the equipment from test tubes 8 due to deformation of clamps 4.

The equipment, which allows the substrate 9 to be positioned perpendicular to the axis of the test tube 8 with a colloidal solution, operates as follows.

First, a cone 5 is placed in a test tube 8. A substrate 9 is installed in a specially designated space on the equipment table 1. The holder is placed in an adapter for test tubes 8 until it contacts the base of the cone 5 and is fixed using three clamps 4. The test tube 8 is placed in the centrifuge rotor.

The colloidal solution (for example, in an amount of about 2.5 ml) is poured through the filling hole. Thus, the substrate 9 is immersed in a colloidal solution. The rotation of the centrifuge is turned on and the colloidal solution, under the action of centrifugal forces, is evenly distributed over the surface of the substrate 9. The formation of a given thickness of the colloidal film is ensured by a combination of certain values of the speed and time of rotation of the centrifuge. After the end of rotation, the test tube 8 is removed from the centrifuge and the equipment is removed together with the substrate 9 from the test tube 8. The substrate 9 is removed from the equipment and other technological operations are performed according to the technological process, in which the stated equipment is not used.

Obtaining the required structure of the colloidal film is ensured by a combination of certain values of the speed and time of rotation of the centrifuge. The main function of the equipment is to ensure positioning of the substrate 9 perpendicular to the axis of the test tube 8 and fixation of the substrate 9 during the technological process, the equipment allows you to fill the volume of the test tube 8 with a colloidal solution using the filling hole after installing the equipment with the substrate 9, the equipment allows you to install the substrate in the test tube 8 and remove the substrate 9 from test tube 8.

The design of the developed equipment provides the possibility of attaching the substrate 9 to the test tube 8, ease of access to the substrate 9 and removal of the substrate 9, economical consumption of the colloidal solution, as well as non-spilling of the colloidal solution during rotation of the test tubes 8.

Experimental studies of the claimed invention were carried out for silica particles (SiO ₂ ) with diameters of 150-300 nm, deposition time varied in the range of 2-12 minutes, rotation speed - 1,500-3,000 rpm. As a result of the experiments, samples were obtained, some of which are presented in Fig. 5. The modes for obtaining them were as follows:

a) d _sf = 275 nm, t _o = 4 min, n _r = 3,000 rpm;

b) d _sf = 275 nm, t _o = 5.5 min, n _r = 1,900 rpm;

c) d _sf = 245 nm, t _o = 3.5 min, n _r = 2,500 rpm.

Thus, by changing the modes of the classical centrifugation method, it is possible to vary many output parameters: packing density, film thickness, crystallinity, etc.

Claims (1)

Equipment for placement in a test tube, configured to be located in a centrifuge rotor, used to obtain a photonic crystal colloidal film on a substrate by centrifugation, characterized in that it is designed to position the substrate perpendicular to the longitudinal axis of the test tube and contains a cone on the basis of which a stage is installed for placing the substrate, connected to a leg, which is connected to a disk having three clamps for attachment to the test tube, and a filling hole for filling the test tube with a colloidal solution.