Method for determining surfactant critical micelle concentration based on terahertz time-domain spectroscopy technology

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: 2015-12-02
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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  • Method for determining surfactant critical micelle concentration based on terahertz time-domain spectroscopy technology
  • Method for determining surfactant critical micelle concentration based on terahertz time-domain spectroscopy technology
  • Method for determining surfactant critical micelle concentration based on terahertz time-domain spectroscopy technology

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Experimental program
Comparison scheme
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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. Image 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 surfactant critical micelle concentration (CMC) based on the terahertz time-domain spectroscopy technology. The method comprises the steps that 1, a sample pool suitable for terahertz spectrum detection is prepared; 2, surfactant solution samples with different concentrations crossing four orders of magnitudes from 0.1 mM to 100 mM are prepared; 3, terahertz time-domain spectrum of a sample solution to be detected is measured and obtained, a relation spectrogram between the concentrations of the samples and terahertz absorption coefficients or refractive indexes are calculated and obtained through a formula, and the concentration, corresponding to a turning point of the spectrogram, of the surfactant sample is determined; 4, surfactant water solution samples which have a series of concentrations with smaller intervals are prepared according to the concentrations selected close to the determined sample turning point concentration; 5, terahertz time-domain spectra of sample solutions to be detected are measured and obtained again; 6, relation spectrograms between the concentrations of the samples to be detected and terahertz absorption coefficients or refractive indexes are calculated and obtained again, and the CMC of a surfactant is determined through spectrogram information. The method has the advantages of being rapid, free of marks, easy to operate, wide in application range, good in repeatability, high in result accuracy and the like.

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 Applications(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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