CN-121978192-A - Device and method for realizing cluster growth and reaction in atmospheric pressure environment

Abstract

The invention relates to the technical field of particle spectrometers or separating pipes, in particular to a device and a method for realizing cluster growth and reaction in an atmospheric pressure environment, wherein the device comprises a reaction shell, an automatic sample injection unit, a temperature control unit and a sample bin, the automatic sample injection unit comprises a syringe, a capillary tube and an ionization mechanism, a sample solution is placed in the syringe, one end of the capillary tube is connected with the syringe, the other end stretches into the reaction shell, the ionization mechanism is arranged at the end part of one end of the capillary tube stretching into the reaction shell, the sample bin is fixedly arranged in the reaction shell, the cluster reaction reagent is placed in the sample bin, the heating mechanism is arranged at the bottom of the sample bin and connected with the temperature control unit, the top of the sample bin is provided with the air guide elbow, and the end part of the air guide elbow is provided with the air nozzle. The method and the device provided by the invention realize the efficient growth and reaction of the clusters, and can directly introduce reaction products into a mass spectrometer for analysis.

Inventors

• KONG XIANGLEI
• SONG YULIN
• LI SHUQI

Assignees

• 南开大学

Dates

Publication Date

20260505

Application Date

20260204

Claims (10)

1. 1. The device for realizing cluster growth and reaction in the atmospheric pressure environment is characterized by comprising a reaction shell, an automatic sample injection unit, a temperature control unit and a sample bin, wherein the reaction shell is provided with a capillary inlet and a reaction cluster outlet, the automatic sample injection unit comprises an injector, a capillary and an ionization mechanism, a sample solution is placed in the injector, one end of the capillary is connected with the injector, the other end of the capillary extends into the reaction shell from the capillary inlet, the ionization mechanism is arranged at the end part of the capillary extending into the reaction shell, the sample bin is fixedly arranged in the reaction shell, the sample bin is provided with a bin gate, a cluster reaction reagent is placed in the sample bin, the bottom of the sample bin is provided with a heating mechanism, the heating mechanism is connected with the temperature control unit, the top of the sample bin is provided with a gas guide elbow, and the end part of the gas guide elbow is provided with a gas nozzle.
2. 2. The apparatus of claim 1, wherein the gas guide elbow is rotatably connected to the top of the sample chamber.
3. 3. An apparatus for performing cluster growth and reaction in an atmospheric pressure environment as set forth in claim 1 wherein the reaction cluster outlet is coupled to a mass spectrometer.
4. 4. An apparatus for effecting cluster growth and reaction in an atmospheric environment as recited in claim 1, wherein: The sample bin is coated with a heat insulation sleeve layer.
5. 5. An apparatus for effecting cluster growth and reaction in an atmospheric environment as recited in claim 1, wherein: The sample solution is an aerosol related precursor substance.
6. 6. An apparatus for effecting cluster growth and reaction in an atmospheric pressure environment as recited in claim 5, wherein: The aerosol related precursor material is a solution of inorganic acid and dimethylamine or a solution of inorganic acid and xylene.
7. 7. An apparatus for effecting cluster growth and reaction in an atmospheric environment as recited in claim 1, wherein: The cluster reagent is a volatile organic compound.
8. 8. An apparatus for effecting cluster growth and reaction in an atmospheric pressure environment as recited in claim 7, wherein: the volatile organic compound is dimethylamine or xylene.
9. 9. A method of effecting cluster growth and reaction in an atmospheric pressure environment, by means of an apparatus for effecting cluster growth and reaction in an atmospheric pressure environment as claimed in any one of claims 1 to 8, characterized by comprising the steps of; S1, a sample solution enters a reaction shell through a capillary tube, is ionized to form gaseous ions, is sprayed out, and forms seed cluster ions in a reaction area; s2, volatilizing the cluster reaction reagent in the sample bin after heating to form reaction reagent steam and transmitting the reaction reagent steam to a reaction area; S3, contacting and combining or reacting seed cluster ions with reactant steam in a reaction area to form reaction clusters; And S4, outputting the reaction cluster from a reaction cluster outlet to a mass spectrometer for detection and analysis.
10. 10. A method for performing cluster growth and reaction in an atmospheric pressure environment as set forth in claim 9 wherein said aerosol related precursor material is a solution of an inorganic acid and dimethylamine or an inorganic acid and xylene, and said cluster reagent is a volatile organic compound.

Description

Device and method for realizing cluster growth and reaction in atmospheric pressure environment Technical Field The invention relates to the technical field of particle spectrometers or separating pipes, in particular to a device and a method for realizing cluster growth and reaction in an atmospheric pressure environment. Background The important gas-phase molecular clusters in the atmosphere often have unique structure, bonding property and reactivity, and become an important system for researching key chemical problems such as catalytic mechanism, aerosol formation, interstellar chemistry, new material generation and the like. By controllably changing the size and composition of the clusters, the problems of interaction and formation process among molecules in the molecular clusters can be researched. Studies have shown that Volatile Organic Compounds (VOCs) can affect or participate in the formation of atmospheric clusters after the clusters have reached a certain size, promoting haze production, i.e. the environmental production or presence of VOC species is critical to the growth and reaction of the relevant clusters. In the conventional gas-phase cluster research method, clusters generated by various ion sources are generally directly sent to a mass spectrometer for detection so as to acquire composition and structure information. When the current method is used, only small-size clusters can be obtained, the structural rule in the cluster growth process is difficult to reveal, and the formation and growth mechanism of the atmospheric clusters is hindered. To solve the above problems, it is necessary to further react or grow the clusters after they are formed and before they enter mass spectrometry. In order to obtain large-size clusters, the currently used method is mainly based on gas-phase cluster reaction of a flow tube to realize cluster growth, such as adding reaction gas into a continuous flow tube reactor to perform effective collision reaction with reactants, enhancing ion current and improving the strength of detected product signals (cluster signals with the size of about 1nm can be detected), the technology needs to introduce the generated clusters into the flow tube through buffer gas (such as He) firstly, the operation is more complicated, the clusters may be adsorbed by the wall in the process, the cluster loss is caused, and the size of the detectable large clusters is only about 1nm, so that the cluster growth and the convenient research of a reactivity experiment cannot be realized. In another gas-phase cluster reaction device, solid organic matters are sublimated into a gas state through an evaporation component and react with flying metal clusters in a reaction tube to grow into metal-organic clusters. The method is mainly applied to clusters with strong interaction between metal and ligand. The patent with publication number CN115631988A discloses a linear ion trap device for realizing the reaction of gas phase clusters under high temperature condition, which can stably provide reaction conditions of different temperatures in the range of room temperature to 1000K for the reaction of gas phase clusters, and is combined with ion generating sources, mass selectors, mass spectra and other devices for researching some chemical behaviors of cluster ions at the temperature of up to 1000K. These designs, on the one hand, are still limited in dough cluster size (below 1 nm) and have limited application range and can only work in cluster studies where there is a strong interaction between the metal and the ligand, but their size increase is generally not achieved for cluster systems based on weak interactions. On the other hand, in such devices, both cluster reaction and growth occur in continuous flow tubes or ion traps, which are far from atmospheric pressure, and are difficult to directly apply to cluster studies in atmospheric chemistry. Disclosure of Invention The invention aims to solve the technical problem of providing a device and a method for realizing cluster growth and reaction in an atmospheric pressure environment, so that the efficient growth and reaction of clusters in the atmospheric pressure environment are realized, and reaction products can be directly introduced into a mass spectrometer for analysis. The utility model provides a device that realizes cluster growth and reaction at atmospheric pressure environment, includes reaction housing, autoinjection unit, temperature control unit and sample storehouse, reaction housing is equipped with capillary import and reaction cluster export, autoinjection unit includes syringe, capillary and ionization mechanism, placed sample solution in the syringe, capillary one end is connected with the syringe, and the other end stretches into in the reaction housing from the capillary import, ionization mechanism installs in the one end tip that the capillary stretches into reaction housing, sample storehouse fixed mounting is in the re