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A substance detection system and method based on gating pressure threshold change

A detection system and pressure threshold technology, applied in measurement devices, instruments, scientific instruments, etc., can solve the problems of expensive detection and analysis methods, instruments and equipment, and high cost of experimental methods

Active Publication Date: 2020-05-22
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the disadvantages of the existing detection and analysis methods, such as expensive instruments and equipment, and high cost of experimental methods, and develops a new detection method for detecting the composition and concentration of substances.

Method used

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  • A substance detection system and method based on gating pressure threshold change
  • A substance detection system and method based on gating pressure threshold change
  • A substance detection system and method based on gating pressure threshold change

Examples

Experimental program
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Embodiment 1

[0037] Surfactant is a kind of substance that can make the interfacial tension of the solution system change significantly when added in a small amount. The molecular structure of surfactants has amphiphilicity: one end is a hydrophilic group and the other end is a hydrophobic group, which makes the surfactant usually concentrate on the surface of the solution, the interface of two immiscibles, or concentrate on the liquid and The interface of the solid acts to reduce the surface (interfacial) tension. Hydrophilic groups are often polar groups, such as carboxylic acid, sulfonic acid, sulfuric acid, amino or amine groups and their salts, hydroxyl groups, amide groups, ether bonds, etc. can also be used as polar hydrophilic groups; while hydrophobic groups Often non-polar hydrocarbon chains, such as hydrocarbon chains with more than 8 carbon atoms. Surfactants are divided into ionic surfactants (including cationic surfactants and anionic surfactants), nonionic surfactants, amph...

Embodiment 2

[0039] Example 2 - Gating liquid containing surfactant (SDBS) is used to detect ion concentration in aqueous phase

[0040] refer to Figure 6 , additional addition of NaCl and CaCl to the gated liquid containing surfactant 2 , with the addition of sodium ions and calcium ions, the critical pressure threshold of the system will be significantly reduced, and the CaCl 2 The effect of NaCl is obvious.

[0041] by figure 1 The structure shown is based on a pure aqueous solution as the gating fluid for the gating cell. The porous membrane is a hydrophilic nylon membrane with a pore size of 1m, and the membrane has multiple interconnected channels. With 4mM SDBS, 0.75mM CaCl 2 The solution is the liquid to be tested. Using a constant pressure pump, the applied pressure P A = 62kPa set at P EC1 (State I: When pure aqueous solution is used as the gating liquid, the gas critical pressure threshold of the system) and P EC2 (State II: with 4mM SDBS, 0.75mM CaCl 2 When the solut...

Embodiment 3

[0042] Embodiment 3 - the gating liquid containing surfactant (SDBS) is used to detect the organic solvent concentration in the aqueous phase

[0043] Organic solvents (such as ethanol, isopropanol, acetone, etc.) can be clearly miscible with water, and through their solvent effect on surfactant solutions, the distribution of surfactants at the interface can be changed, thereby changing the liquid gate containing surfactants. control the gas critical pressure threshold of the composite membrane system. refer to Figure 8 , when the concentration of ethanol aqueous solution is added in the range of 0% to 30% v / v, the gas critical pressure of the system will be higher than that of the gating unit containing only SDBS gating liquid. If at this time, the aqueous ethanol solution containing this concentration of 0% to 30% v / v is added to the gating unit of the gating liquid containing only SDBS, the opposite phenomenon will occur in Example 2: the gas critical pressure threshold o...

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Abstract

The invention discloses a substance detection and analysis method based on a gate control pressure threshold change. A detection system comprises a gas passageway, a gate control unit, an instructionunit and a to-be-detected liquid, wherein the gate control unit is arranged in the gas passageway and has a stimulating response to the to-be-detected liquid; and the gate control unit comprises a porous membrane and a gate control liquid, wherein the gate control liquid at least partially infiltrates into the porous membrane, and the gate control liquid and the porous membrane cooperate to form agate control channel of the gas passageway. During detection, since the to-be-detected liquid makes contact with the gate control unit, a gate control pressure threshold is changed; and under the action of a high-pressure gas stored in the gas passageway or additionally exerted pressure, the gas can pass through the gate control channel and act on the instruction unit. Through the new detection method, a substance detection signal can be converted into a critical pressure change signal of the gas passing membrane.

Description

technical field [0001] The invention relates to a substance detection and analysis system and method based on the change of the gate pressure threshold value, which can be used for the detection of inorganic ions, small molecules, biological macromolecules and the like. The invention belongs to the field of new substance detection method and new detection device design. Background technique [0002] Detection technology is a means for human beings to scientifically recognize the objective world, and plays a role in the human sensory world. Most of the existing substance detection systems are based on physical, chemical and biological principles. The detection methods include active and passive, direct and indirect, contact and non-contact, dynamic and static and other forms, and the signals are mostly detected by signals such as power consumption. way. However, the usual substance detection system needs to consume a lot of resources such as large-scale precision instrument...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/00
CPCG01N33/00
Inventor 侯旭樊漪盛智芝陈柏屹
Owner XIAMEN UNIV
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