CN111369877A

CN111369877A - Container-free ultramicro chemical reaction observation device

Info

Publication number: CN111369877A
Application number: CN202010136214.7A
Authority: CN
Inventors: 姚夙; 韦寿莲; 汪洪武
Original assignee: Zhaoqing University
Current assignee: Zhaoqing University
Priority date: 2020-03-02
Filing date: 2020-03-02
Publication date: 2020-07-03
Anticipated expiration: 2040-03-02
Also published as: CN111369877B

Abstract

The invention relates to the field of chemical reaction devices, in particular to a container-free ultra-micro chemical reaction observation device. The invention discloses a container-free ultramicro chemical reaction observation device, which consists of a base, a protective cover top cover, a reagent feeder, a cleaner and a waste liquid collector. The protective cover is arranged on the base, the protective cover top cover is arranged at the top of the protective cover, a plurality of hole sites are arranged on the surface of the protective cover top cover, and the hole sites are used for installing the reagent adding device and the cleaning device; the waste liquid collector is arranged below the reagent feeder and the cleaner and used for receiving reaction products or cleaned waste liquid. The invention solves the problems that the existing chemical reaction observation device has poor observation effect and is not popularized in teaching. The device has the advantages of simple structure, low cost, convenient manufacture, simple and convenient operation and convenient popularization.

Description

Container-free ultramicro chemical reaction observation device

Technical Field

The invention relates to the field of chemical reaction devices, in particular to a container-free ultra-micro chemical reaction observation device.

Background

In traditional chemical experiment teaching, often adopt devices such as beaker, test tube to go on when observing phenomena such as dissolving, discolour, production deposit, production gas, often need consume more chemical reagent. Under the condition, on one hand, the experiment cost is high, so that part of valuable reagents cannot be applied to experiment teaching; on the other hand, more products after reaction are not easy to treat, easily cause environmental pollution and do not accord with the concept of green chemistry. Some manufacturers have developed instruments for micro chemical reactions, but the observation effect is often poor, and the instruments are not popularized in teaching.

Disclosure of Invention

Aiming at the problems, the invention provides a container-free ultramicro chemical reaction observation device, which consists of a base, a protective cover top cover, a reagent feeder, a cleaner and a waste liquid collector; the protective cover is arranged on the base, the protective cover top cover is arranged at the top of the protective cover, a plurality of hole sites are arranged on the surface of the protective cover top cover, and the hole sites are used for installing the reagent adding device and the cleaning device; the waste liquid collector is arranged below the reagent feeder and the cleaner and used for receiving reaction products or cleaned waste liquid.

Wherein, the protection casing is installed on the base for prevent chemical reagent spill in the experiment.

Preferably, a locking device is further disposed on the hole site for fixing the reagent feeder and the washer.

Preferably, the number of the reagent adding devices is 2-4; the tips of the reagent applicators should remain in the same plane and within 1 mm of each other.

Preferably, the cleaning device is generally 1-2, and the tip of the cleaning device is slightly 2-3 mm higher than the tip of the reagent adding device.

Preferably, the reagent adding devices are micro-sampling needles, or the reagent adding devices are supporting devices for bearing solids.

Preferably, the observation device further comprises a video acquisition device, and a camera of the video acquisition device is over against the magnifier.

Preferably, the base is further provided with a clamp for fixing the video acquisition device.

More preferably, the video capture device is a smartphone.

Preferably, the observation device further comprises a heating coil disposed above the waste liquid collector, and heating can be performed by the heating coil if reagent reaction requires heating.

Preferably, a magnifier is installed on the wall of the protective cover and used for magnifying and observing reaction phenomena; the magnifying lens is directed towards the viewed droplet.

Preferably, the reaction of liquid and liquid reagents is carried out by pushing out 5 microliters of each of two or more of said reagent feeders, and all the pushed out liquid reagents are gathered into one larger droplet due to surface tension and suspended at the tip of said reagent feeder for reaction.

Preferably, the reagent feeder is an injection device in the form of a micro-needle when liquid reagents are fed, and a support device for supporting solids is used when solids are fed.

Preferably, the supporting end of the supporting device is spoon-shaped.

Preferably, when the reaction between the liquid and the solid reagent is performed, 1-5 mg of the solid is added into one reagent adding device, the reagent adding device filled with the liquid is pushed out for 2-10 microliters of the reagent to contact with the solid reagent, and the pushed-out liquid reagent is mixed with the solid reagent to perform the reaction at the supporting end of the supporting device.

Preferably, the reagent feeder is positioned directly below the reagent feeder containing the liquid when the reagent feeder feeds the solid.

The invention has the beneficial effects that:

1. the device consumes less reagent, only about 2-10 microliters of solution is needed in one reaction, and the reaction is one thousandth of that of the traditional method, so that the experimental cost is greatly saved, the treatment difficulty of waste liquid is reduced, and the experimental safety risk is reduced.

2. In the device, the chemical reaction is carried out in suspended liquid drops, and a reaction container is not needed, so that the experiment cost is further reduced.

3. The device of the invention uses the video acquisition device as an observation recording instrument, thereby not only ensuring the experiment effect, but also being capable of observing the experiment details with the resolution ratio exceeding that of naked eyes, and being capable of playing back repeatedly, and being beneficial to students to study and teachers to check the experiment results.

4. The device has the advantages of simple structure, low cost, convenient manufacture, simple and convenient operation and convenient popularization.

Drawings

The invention is further illustrated by means of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be obtained on the basis of the following drawings without inventive effort.

FIG. 1 is a schematic view showing the structure of an apparatus for observing a containerless ultra-micro chemical reaction;

FIG. 2 is a schematic diagram of a liquid-liquid mixing reaction using the apparatus of the present invention;

FIG. 3 is a schematic diagram of a liquid-solid mixing reaction using the apparatus of the present invention;

FIG. 4 is a reaction of ferric chloride solution and potassium thiocyanate solution in example 2;

FIG. 5 is a reaction of a silver nitrate solution and a potassium chloride solution in example 3;

FIG. 6 is a reaction of sodium carbonate solution and hydrochloric acid in example 4;

reference numerals: the device comprises a base (1), a protective cover (2), a protective cover top cover (3), a reagent feeder (4), a cleaner (5), a heating coil (6), a waste liquid collector (7), a magnifier (8), a video acquisition device (9) and a clamp (10); the dotted line P is the optical axis.

Detailed Description

The invention is further described with reference to the following examples.

Example 1

A container-free ultra-micro chemical reaction observation device is shown in figure 1 and comprises a base (1), a protective cover (2), a protective cover top cover (3), a reagent adding device (4), a cleaning device (5), a heating coil (6), a waste liquid collector (7), a magnifying glass (8), a video acquisition device (9) and a clamp (10), and is installed according to the mode shown in figure 1.

Wherein, the protective cover (2) is arranged on the base (1) and used for preventing chemical reagents in the experiment from splashing. The protective cover top cover (3) is arranged at the top of the protective cover (2), and the surface of the protective cover top cover is provided with a plurality of hole sites with hand-screwed screw locking devices for installing the reagent adding device (4) and the cleaning device (5). The number of the reagent feeder (4) is determined by the actual requirement, and is generally 2-4, and the number of the cleaning device (5) is generally 1-2. When adding liquid reagent, the reagent adding device (4) adopts an injection device in the form of a micro-injection needle; when adding the solid, a reagent adding device (4) adopts a small spoon-shaped supporting device. The tips of all reagent applicators (4) should be maintained in the same plane and within 1 mm of each other. The cleaner (5) is an injection device in the form of an injector, is filled with distilled water or other cleaning agents, and has a tip which is slightly higher than the tip of the sample feeder by 2-3 mm.

As shown in FIG. 2, when the reaction of liquid and liquid reagent is performed, two or more reagent feeders (4) push out about 5. mu.l of each reagent, and all the pushed out liquid reagents are gathered into a larger liquid droplet to be hung at the tip of an injection device in the form of a micro-injection needle for reaction due to the surface tension.

As shown in FIG. 3, when the reaction between liquid and solid is performed, 1-5 mg of solid is added into one reagent feeder (4), the reagent feeder (4) containing liquid is pushed out by 2-10. mu.l of reagent to contact with the solid reagent, and the pushed-out liquid reagent and solid reagent are mixed and reacted at the supporting end of the supporting device.

If the reaction requires heating, the heating coil (6) can be energized to achieve a higher temperature. After the reaction is finished, a small amount of cleaning agent is injected by the cleaning device (5) to clean the tip of the sample adding device (4), and then the next experiment can be started. All waste liquids such as reaction products and cleaning agents are collected by a waste liquid collector (7).

In order to obtain better observation effect, a magnifier (8) is arranged on the wall of the protective cover (2) and is used for magnifying and observing reaction phenomenon (a dotted line P is an optical axis). The video acquisition device (preferably a smart phone) (9) is fixed on the base (1) by the clamp (10), and the camera center, the magnifier center and the observed liquid drop of the video acquisition device (9) are on the same straight line. The reaction process is recorded in the whole course of the video recording function of the video acquisition device, and the experimental video can be repeatedly played back to observe the details of the reaction process after the experiment is completed.

Example 2

The invention is used for observing the reaction of ferric chloride solution and potassium thiocyanate solution

In this example, a reaction was carried out using a ferric chloride solution having a concentration of 0.015mol/L and a potassium thiocyanate solution having a concentration of 0.015 mol/L. As shown in fig. 4, the process of the solution changing from near colorless to a brownish red color was clearly observed. Therefore, the invention is suitable for observing the chemical reaction of the discoloration type.

Example 3

The invention is used for observing the reaction of silver nitrate solution and potassium chloride solution

In this example, a silver nitrate solution having a concentration of 0.15mol/L and a potassium chloride solution having a concentration of 0.15mol/L were used to carry out a reaction. As shown in fig. 5, the process of the solution changing from clear to turbid was clearly observed. It follows that the present invention is suitable for observing chemical reactions that produce precipitates.

Example 4

The invention is used for observing the reaction of the sodium carbonate solution and the hydrochloric acid

In this example, a sodium carbonate solution having a concentration of 0.5mol/L and a hydrochloric acid solution having a concentration of 0.5mol/L were used to carry out the reaction. As shown in fig. 6, a large number of bubbles were generated in the solution and then gradually disappeared. It can be seen that the present invention is suitable for observing chemical reactions that produce gases.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A container-free ultra-micro chemical reaction observation device is characterized by comprising a base, a protective cover top cover, a plurality of reagent adding devices, a cleaning device and a waste liquid collector; the protective cover is arranged on the base, and the protective cover top cover is arranged at the top of the protective cover;

the reagent feeder and the cleaner are arranged on the top cover of the protective cover; the extrusion ports of the reagent feeder should be kept in the same plane and close to each other within a distance of 1 mm;

the waste liquid collector is arranged below the reagent feeder and the cleaner and used for receiving reaction products or cleaned waste liquid.

2. The apparatus for observing containerless ultra-micro chemical reaction of claim 1, wherein a locking means is further provided at the hole site for fixing the reagent feeder and the cleaning unit.

3. The container-less ultra-micro chemical reaction observation apparatus according to claim 1, wherein the observation apparatus is used for detecting a reaction between a liquid and a liquid or a reaction between a liquid and a solid.

4. The container-less microchemical reaction observing apparatus of claim 1, wherein the number of reagent feeders is 2 to 4; the number of the cleaners is 1-2, and the tips of the cleaners are 2-3 mm higher than those of the reagent adding devices.

5. The container-less ultra-micro chemical reaction observation apparatus according to claim 1, further comprising: and the heating coil is arranged above the waste liquid collector, and can be used for heating if the reagent reaction needs heating.

6. The container-less microchemical reaction observing apparatus of claim 1, wherein a magnifying glass is installed on a wall of the shield for magnifying and observing a reaction phenomenon; the magnifying lens is directed towards the viewed droplet.

7. The apparatus for observing containerless ultra-micro chemical reaction of claim 1, wherein the reagent feeder is a micro-needle or a support for supporting a solid.

8. The apparatus for containerless ultra-micro chemical reaction observation of claim 3, wherein when the apparatus is used to perform a reaction between a liquid and a liquid, the reagent is pushed out from each of the reagent feeders, and all the pushed out liquid reagents are gathered into one large droplet by a surface tension effect and suspended at a tip of the reagent feeder to perform the reaction.

9. The apparatus for containerless ultra-micro chemical reaction observation according to claim 3, wherein when the apparatus is used to perform a reaction between a liquid and a solid, a reagent feeder containing a liquid is pushed out to bring a reagent into contact with the solid reagent, and the pushed-out liquid reagent is mixed with the solid reagent to perform the reaction.

10. The apparatus for observing containerless ultra-micro chemical reaction of claim 6, further comprising: the camera of the video acquisition device is over against the magnifier; and the base is also provided with a clamp for fixing the video acquisition device.