Method for preparation of water-soluble CdS quantum dot-beta cyclodextrin inclusion compound from supercritical carbon dioxide

A technology of β-cyclodextrin and quantum dots, which is applied in the field of preparation of CdS quantum dot-β-cyclodextrin inclusion compound, can solve the problems of time-consuming, long time-consuming, low efficiency, etc. cost effect

Inactive Publication Date: 2014-12-31
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] And for the method that uses mechanical stirring, this method is time-consuming very long, usually needs

Method used

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  • Method for preparation of water-soluble CdS quantum dot-beta cyclodextrin inclusion compound from supercritical carbon dioxide
  • Method for preparation of water-soluble CdS quantum dot-beta cyclodextrin inclusion compound from supercritical carbon dioxide

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Embodiment 1

[0025] In this embodiment, a method for preparing a water-soluble CdS quantum dot-β-cyclodextrin inclusion compound is provided. Described method is specifically:

[0026] ①Preparation of n-octylamine-modified CdS quantum dots and β-cyclodextrin solution

[0027] At room temperature, a solution of AOT in isooctane and CdCl 2 The solution was stirred at constant temperature; then slowly injected Na 2 S solution, vigorously stirred at constant temperature. Subsequently, an isooctane solution of n-octylamine was injected and stirred at a constant temperature of 60°C to obtain n-octylamine-modified CdS quantum dots;

[0028] At the same time, use commercially available β-cyclodextrin and ultrapure water to prepare a β-cyclodextrin solution;

[0029] ② Preparation of CdS quantum dots-β-cyclodextrin inclusion compound

[0030] Move the n-octylamine-modified CdS quantum dots and β-cyclodextrin solution obtained in step ① into a high-pressure reactor, place it in a water bath at ...

Embodiment 2

[0038] In this embodiment, a method for preparing a water-soluble CdS quantum dot-β-cyclodextrin inclusion compound is provided. Described method is specifically:

[0039] ① Preparation of n-octylamine-modified CdS quantum dots

[0040] Analytical balance weighs 0.5701g of cadmium chloride hydrate (CdCl 2 2.5H 2 O) In a 50ml volumetric flask, dilute to volume with ultrapure water to make 0.05mol / L CdCl 2 solution; the analytical balance weighs 0.3005g of sodium sulfide hydrate (Na 2 S·9H 2 O) in a 50ml volumetric flask, then dilute to volume with ultrapure water to make 0.025mol / L Na 2 S solution. Weigh 2.2228g of AOT in a 50ml volumetric flask with an analytical balance, and dilute to volume with isooctane to make a 0.1mol / L isooctane solution of AOT; measure 119μl of dodecanethiol in a 10ml brown volumetric flask , then constant volume with isooctane to make 0.05 mol / L n-octylamine solution in isooctane.

[0041] Take 5 ml of 0.1 mol / L AOT in isooctane solution in a ...

Embodiment 3

[0048] In the preparation method of the water-soluble CdS quantum dot-β cyclodextrin inclusion compound of this embodiment, steps ① and ③ are the same as in Example 2, and step ② is: washing the obtained n-octylamine-modified CdS quantum dots with water Go to excess AOT, repeat three times. Afterwards, the n-octylamine-modified CdS quantum dots and the β-cyclodextrin solution were moved into a high-pressure reactor, and placed in a water bath to maintain a constant temperature of 35°C. Introduce carbon dioxide gas, when the pressure in the reactor reaches 30MPa, carbon dioxide enters its critical region, showing a supercritical fluid state, close the inlet valve, and stir at constant temperature for 4 hours.

[0049] In the present invention, supercritical carbon dioxide is used to prepare CdS quantum dot-β-cyclodextrin inclusion compound, and the ratio of CdS quantum dot and β-cyclodextrin inclusion compound can be controlled to synthesize different concentrations, CdS quant...

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Abstract

The invention provides a preparation method of a water-soluble CdS quantum dot-beta cyclodextrin inclusion compound. The method firstly employs a micro-emulsion technique to synthesize oil soluble n-octyl amine modified CdS quantum dots, and then adopts supercritical CO2 as the solvent to prepare the water-soluble CdS quantum dot-beta cyclodextrin inclusion compound with fluorescence properties. Being simple and rapid, the method has a high encapsulation rate, overcomes the too long time consumption disadvantage of traditional mechanical stirring methods, and also reduces the cost of the raw materials, so that large-scale application of the CdS quantum dot-beta cyclodextrin inclusion compound becomes possible.

Description

technical field [0001] The invention relates to the field of quantum dots, in particular to a method for preparing a CdS quantum dot-beta cyclodextrin inclusion compound. Background technique [0002] Quantum dots (Quantum dots, QDs), also known as semiconductor nanocrystals, are a special class of nanoparticles with a particle size generally between 1-100nm and a radius close to the Bohr radius of excitons, capable of photoluminescence. Quantum dots are usually composed of 102 to 105 atoms, which is a three-dimensional cluster, which is composed of a limited number of atoms, and the three dimensions are all on the order of nanometers. The physical behavior (such as optical and electrical properties) of this zero-dimensional system is similar to that of atoms, and the energy state of electrons in it presents a discrete energy level structure similar to atoms, so quantum dots are also called "artificial atoms". Common quantum dots are CdSe, CdTe, ZnSe, etc. [0003] Quantum...

Claims

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Application Information

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IPC IPC(8): C09K11/56
CPCY02P20/54
Inventor 安学勤曹思盛
Owner EAST CHINA UNIV OF SCI & TECH
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