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Preparation method of photo-response type chirality intelligent nanometer particles

A nanoparticle and responsive technology, which is applied in the field of preparation of light-responsive chiral smart nanoparticles, can solve the problems of complex synthesis steps and expensive chiral reagents, achieve low price, excellent optical switch performance, and overcome expensive Effect

Inactive Publication Date: 2012-08-15
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing light-responsive chiral smart nanoparticles, so as to overcome the problems of expensive chiral reagents and complex synthesis steps in the traditional chiral polymer synthesis process.

Method used

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  • Preparation method of photo-response type chirality intelligent nanometer particles
  • Preparation method of photo-response type chirality intelligent nanometer particles
  • Preparation method of photo-response type chirality intelligent nanometer particles

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Embodiment 1

[0035] Embodiment one: see figure 1 Shown is a schematic diagram of the left-handed / right-handed circularly polarized light source used in this embodiment. In this embodiment, the USH-500SC2 type 500-watt high-pressure mercury lamp of Japan Ushio Company, narrow-band filter (405, 436 and 546 nm, Sigma Koki and Asahi spectrum company), polarizer (230-2300 nm, Sigma Koki ); 1 / 4 wavelength version (Sigma Koki).

[0036]Chemical reagent used in the embodiment: tetrakis (triphenylphosphine) palladium, 99%, Aldrich; p-bromoaniline, 99%, Aldrich; Manganese dioxide, 98%, Acros; Benzene, 99%, Aldrich; Tetrahydrofuran, 99 %, Acros; 2,7-bis(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-9,9-di-n-octylfluorene, 98%, Aldrich; Acetone, 99%, China National Pharmaceutical (Group) Shanghai Chemical Reagent Company; Potassium carbonate, 99%, China National Pharmaceutical (Group) Shanghai Chemical Reagent Company; Chloroform, 99%, China National Pharmaceutical (Group) Shanghai Chemical Reagent...

Embodiment 2

[0054] Embodiment 2: Change the weak solvent in Embodiment 1 to isobutanol, and polymer chiral smart nanoparticles can also be prepared. The specific description is as follows:

[0055] (1) pass Figure 9 The circular dichroism spectra of polymer F8AZO before and after irradiation with left-handed / right-handed circularly polarized light at 436 nm and 546 nm can be seen. Chiral signal, while the chiral helical direction of polymer nanoparticles can be controlled by the helical direction of light, the wavelength of circularly polarized light has a certain influence on the strength of the chiral signal of polymer nanoparticles, which is described in Example 1 different;

[0056] (2) Figure 10 It is a schematic diagram of the chiral optical switch of the polymer F8AZO in the mixed solvent of chloroform / methanol. It can be seen from the figure that the chirality of the polymer nanoparticles is irradiated alternately with right-handed / left-handed circularly polarized light at 436...

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Abstract

The invention discloses a preparation method of photo-response type chirality intelligent nanometer particles. The preparation method is characterized by comprising the following steps of: preparing a trichloromethane solution with a repetitive unit concentration of 3*10<-2> mg / mL from a 9,9-dioctylfluorene-azobenzene alternating copolymer, wherein Mn in the 9,9-dioctylfluorene-azobenzene alternating copolymer is equal to 7770 g / mol and the ratio of Mw to Mn is equal to 2.62; uniformly mixing the solution with alcohol the volume of which is the same as that of the solution; and irradiating the mixture for 1-30 minutes by using levorotatory or dextrotatory polarized light so as to obtain left-handed helix or right-handed helix chirality nanometer particles. By using the preparation method provided by the invention, the problems that when the traditional method is adopted to synthesize the polymer chirality intelligent nanometer particles, a chiral reagent is expensive, synthetic steps are complex and the like are solved; the obtained product is alternatively irradiated by the levorotatory or dextrorotatory polarized light, thus the chiral spiral direction of the nanometer particles can be changed, so as to present the good properties of a photo switch.

Description

technical field [0001] The invention relates to a preparation method of light-responsive chiral intelligent nanoparticles, in particular to left-handed / right-handed circularly polarized light-induced formation of chirality and light-response performance of the nanoparticles. Background technique [0002] The scientific theory of chirality caused by left-handed / right-handed circularly polarized light has attracted more and more attention from scientists. At present, as the cleanest and cheapest source of chirality, left-handed / right-handed circularly polarized light has been widely used in the fields of asymmetric photochemical synthesis and asymmetric photolysis. Due to the characteristics of the chiral source of left-handed / right-handed circularly polarized light, the successful use of this technology can overcome the influence of expensive chiral reagents and complicated synthesis steps, and has attracted more and more attention from scientists. [0003] Due to their good...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/28C08L65/00C08G61/12
Inventor 张伟张健刘江飞朱秀林周年琛
Owner SUZHOU UNIV
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