A method for determining the critical micelle concentration of surfactants based on terahertz time-domain spectroscopy

A critical micelle concentration and surfactant technology, applied in the direction of material analysis, measuring devices, instruments, etc. through optical means, to achieve good repeatability, wide application range, and high accuracy of results

Inactive Publication Date: 2017-10-03
CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, there are no relevant patents and literature reports on the use of terahertz time-domain spectroscopy to detect surfactant CMC

Method used

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  • A method for determining the critical micelle concentration of surfactants based on terahertz time-domain spectroscopy
  • A method for determining the critical micelle concentration of surfactants based on terahertz time-domain spectroscopy
  • A method for determining the critical micelle concentration of surfactants based on terahertz time-domain spectroscopy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Using terahertz time-domain spectroscopy to study the nonionic surfactant C 12 E. 9 The method that solution CMC detects, it may further comprise the steps:

[0059] 1. Construct a sample cell suitable for terahertz detection: use PET double-sided adhesive to bond two transparent plastic sheets, and the circular chamber is filled with C 12 E. 9 The volume of the solution is about 17.7 μl;

[0060] 2. Preparation C 12 E. 9 Aqueous samples: the C 12 E. 9 Mix it with deionized water in proportion, prepare a surfactant solution sample mother solution with known concentration, and dilute in proportion to obtain a series of solution samples to be tested with a concentration range of 0.1mM to 100mM;

[0061] 3. Detection and signal processing of solution samples: use the terahertz time-domain spectroscopy device to use the transmitted light path and use the empty sample cell as a reference to detect the solution samples and repeat the measurement three times for each sa...

Embodiment 2

[0065] This embodiment provides a method of using terahertz time-domain spectroscopy to analyze C under high-salt environment. 12 E. 9 The method that solution CMC detects, operation steps are exactly the same as embodiment 1, just the sample to be tested is ionic surfactant C 12 E. 9 of PBS solution. Figure 5 For different concentrations of C in Example 2 12 E. 9 Absorption coefficient plot of phosphate buffered saline (PBS).

Embodiment 3

[0067] This embodiment provides a method of using terahertz time-domain spectroscopy to analyze C in acidic environment. 12 E. 9 The method that solution CMC detects, operation steps are exactly the same as embodiment 1, just the sample to be tested is ionic surfactant C 12 E. 9 acid solution. Figure 6 For different concentrations of C in Example 3 12 E. 9 Absorption coefficient plot of hydrochloric acid solution.

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Abstract

The invention relates to a method for determining the critical micelle concentration (Critical Micelle Concentration, CMC) of a surfactant based on terahertz time-domain spectroscopy, comprising the following steps: S1: preparing a sample cell suitable for terahertz spectral detection; S2: preparing a trans Four orders of magnitude: surfactant solution samples with different concentrations from 0.1 to 100mM; S3: measure and obtain the terahertz time-domain spectrum of the sample solution to be tested; use the formula to calculate the relationship between the concentration of the sample and the terahertz absorption coefficient or refractive index Spectrum, determine the surfactant sample concentration corresponding to the turning point in the image; S4: Select and prepare a series of surfactant aqueous solution samples with smaller intervals around the determined sample turning concentration; S5: Measure again and obtain Measure the terahertz time-domain spectrum of the sample solution; S6: recalculate to obtain the relationship spectrum between the concentration of the sample solution to be tested and the terahertz absorption coefficient or refractive index, and determine the CMC of the surfactant through the image information. The method has the advantages of fast, label-free, simple operation, wide application range, good repeatability, and high accuracy of results.

Description

technical field [0001] The invention belongs to the technical field of surfactant analysis, and relates to a method for determining the critical micelle concentration (Critical Micelle Concentration, CMC) of a surfactant based on terahertz time-domain spectroscopy. Background technique [0002] Surfactants have various properties, such as wetting, emulsifying, foaming, dissolving, dispersing, washing, corrosion resistance, antistatic, etc., and are widely used in various fields, such as medicinal chemistry, synthetic chemistry, materials science, biology Wait. At a certain concentration, that is, CMC, the surfactant begins to form thermodynamically stable micelles, and at the same time, various properties change significantly. Therefore, the determination of CMC is of great significance in practical applications and is a hotspot in the research of physical chemistry and analytical chemistry. The currently developed CMC determination method is to determine the CMC value by ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/3586
Inventor 颜识涵魏东山汤明杰张明焜施长城杜春雷崔洪亮
Owner CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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