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A preparation method of highly viscoelastic surfactant worm-like micelles with pH response

A technology of worm-like micelles and elastic surface, which can be applied to medical preparations containing active ingredients, preparations for skin care, pharmaceutical formulations, etc. Sensitivity and rapidity, widening the pH range, and simple and easy preparation methods

Active Publication Date: 2021-08-24
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under certain conditions, both α-carboxytridecyldimethylamine oxide and α-carboxypentadecyldimethylamine oxide can form worm-like micelles, but the pH response range for forming worm-like micelles is narrow , in practical applications, the viscoelasticity needs to be stable in a certain pH range, which is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Preparation of highly viscoelastic surfactant worm-like micelles with pH response

[0019] Weigh 0.1 g of α-carboxytridecyl dimethyl amine oxide and 0.1 g of α-carboxypentadecyl dimethyl amine oxide respectively, add them to distilled water in a water bath at 25°C, and ultrasonically oscillate to dissolve them. An aqueous solution with a mass concentration of 1.1% was prepared, and the pH value of the aqueous solution was determined to be 6.42.

[0020] The solution has significant shear dilution, and its zero-shear viscosity is measured to be 8Pa·s. When the angular frequency is lower than the characteristic angular frequency, and the loss modulus G'' is greater than the storage modulus G', the system behaves as Viscosity; when the angular frequency is higher than the characteristic angular frequency, the storage modulus G' is greater than the loss modulus G", and the system behaves elastically. Therefore, the solution has obvious viscoelastic fluid behavior, which is ...

Embodiment 2

[0022] Preparation of highly viscoelastic surfactant worm-like micelles with pH response

[0023] Add α-carboxytridecyl dimethyl amine oxide and α-carboxypentadecyl dimethyl amine oxide into distilled water at a mass ratio of 1:8 in a water bath at 45°C, and stir the It was dissolved to obtain an aqueous solution with a mass concentration of 9.8%, and the pH value of the aqueous solution was measured to be 6.8.

[0024] The aqueous solution is in the form of a gel, and the scanning range of the shear rate is 0.01 ~ 100 1 / s. The steady state mode is used to scan the obtained aqueous solution. It is measured that a Newtonian plateau appears in a certain shear rate range, and the solution viscosity does not change with the shear rate. The shear rate changes, showing typical Newtonian fluid behavior; when the shear rate exceeds the critical value, it has significant shear dilution, and its zero-shear viscosity is 116Pa s, which proves to be a high viscoelasticity with pH response ...

Embodiment 3

[0027] Preparation of highly viscoelastic surfactant worm-like micelles with pH response

[0028] Add α-carboxytridecyldimethylamine oxide and α-carboxypentadecyldimethylamine oxide in a mass ratio of 2:1 to a buffer solution with a pH of 5.8 in a water bath at 70°C , dissolved by heating and stirring to obtain an aqueous solution with a mass concentration of 2.5%.

[0029] The rheological properties of the obtained solution were measured, showing that the solution had rheological dilution behavior, and the zero-shear viscosity was 4.3 Pa·s, indicating that it was a highly viscoelastic surfactant worm-like micelle with pH response.

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Abstract

The invention discloses a preparation method of highly viscoelastic surfactant worm-like micelles with pH response, and belongs to the field of colloid interface chemistry. Specifically disclosed is to prepare a mixed solution with amphoteric surfactants α-carboxytridecyl dimethyl amine oxide and α-carboxypentadecyl dimethyl amine oxide. In the range of 5.5 to 7.5, the mixing ratio of the two surfactants is in the range of 2 / 1 to 1 / 8, and when the total surfactant concentration reaches 1 to 10%, a highly viscoelastic worm-like substance with a wide stable range can be obtained. micelles. The raw material of the worm-like micelles is derived from natural oil derivatives, the preparation method is simple, the viscoelasticity of the system is outstanding, the product is mild and non-irritating, and the pH response is quick, and it is well prepared in environmental protection, oil field exploitation, textile printing and dyeing, industrial cleaning and high-end cosmetics. There are broad application prospects.

Description

technical field [0001] The invention relates to the field of colloidal interface chemistry, in particular to a preparation method of highly viscoelastic surfactant worm-like micelles with pH response. Background technique [0002] Surfactants are special small molecule amphiphilic compounds with surface activity, which can self-assemble into spherical micelles, short rod micelles, worm-like micelles, vesicles and lamellar liquid crystals and other ordered structures. Worm-like micelles refer to the fact that under certain conditions, the size of self-assembled micelles of surfactants with a specific structure in the solution increases along the one-dimensional direction, and at the same time, the micelles can intertwine and overlap each other to form a flexible three-dimensional network The spatial structure shows viscoelasticity similar to that of a polymer gel macroscopically, and at the same time, continuous destruction-reorganization occurs to form a dynamic equilibrium....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61K8/41A61K8/06A61Q19/00
CPCA61K8/06A61K8/41A61K2800/10A61K2800/5922A61K2800/596A61Q19/00
Inventor 齐丽云张萌包浩方云
Owner JIANGNAN UNIV
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