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Preparation method of fluorescent cholesteric cellulose nanocrystal film with acid-base gas response

A nanocrystal and gas-responsive technology, applied in fluorescence/phosphorescence, chemical instruments and methods, luminescent materials, etc., can solve the problems of high cost and complicated sensor operation, and achieve the effect of avoiding agglomeration, avoiding aggregation and delamination

Active Publication Date: 2018-12-21
QINGDAO UNIV OF SCI & TECH
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  • Description
  • Claims
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Problems solved by technology

[0006] Aiming at the problem that the single characteristic of the fluorescence detection sensor in the prior art causes the operation of the sensor to be complicated and the cost is high, the purpose of the present invention is to provide a method for preparing a fluorescent cholesteric cellulose nanocrystal film with an acid-base gas response. A fluorescent cholesteric CNC film that can detect various optical properties of acid-base gases and can be recycled

Method used

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  • Preparation method of fluorescent cholesteric cellulose nanocrystal film with acid-base gas response
  • Preparation method of fluorescent cholesteric cellulose nanocrystal film with acid-base gas response
  • Preparation method of fluorescent cholesteric cellulose nanocrystal film with acid-base gas response

Examples

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Embodiment 1

[0036] A method for preparing a fluorescent cholesteric cellulose nanocrystal film with acid-base gas response:

[0037] 1) Preparation of CNC suspension: Add 10g of WhatmanCF11 cellulose powder and 175mL of 64w% sulfuric acid solution into a round-bottomed flask, stir for 1 hour at 45°C, and add 1L of deionized water to terminate the reaction. After standing for 1 day, pour off the supernatant, centrifuge the lower turbid solution at 10,000rpm for several times and collect the upper turbid solution, and then place 4 Carry out dialysis treatment in the dialysis bag, to remove unnecessary free acid in the suspension, dialysis 15 days until the CNC suspension is neutral, stand-by;

[0038] 2) Preparation of BPP2VA: add anthracene (38.0mmol), paraformaldehyde (200.0mmol), zinc chloride (51.4mmol) and 1,4-dioxane (80.0ml) into a single-necked round bottom flask in sequence according to the determined ratio Add a certain amount of concentrated hydrochloric acid dropwise, and reflu...

Embodiment 2

[0050] This example is the same as Example 1, except that the AIE organic small molecule fluorescent materials used can also be spiropyran or spirooxazine compounds that respond to acid and alkaline gases, including BP4VA, TPE- OX et al.

Embodiment 3

[0052] This embodiment is the same as Embodiment 1, except that the acid gas used can also be volatile acids such as nitric acid, formic acid, acetic acid, trifluoroacetic acid and hydrobromic acid.

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Abstract

The invention discloses a preparation method of a fluorescent cholesteric cellulose nanocrystal film with acid-base gas response. The preparation method comprises the following steps: 1) preparing a cellulose nanocrystal suspension; 2) synthesizing an AIE type organic small-molecule fluorescent material; 3) preparing an AIE type fluorescent suspension; 4) mixing the cellulose nanocrystal suspension with the AIE type organic small-molecule fluorescent material, and performing magnetic stirring and ultrasonic treatment; 5) performing an evaporation-induced co-assembly process to obtain a fluorescent cellulose film with a cholesteric structure. According to the preparation method disclosed by the invention, the problem in phase separation of the cellulose nanocrystal and the water-insoluble organic small-molecule fluorescent material is solved, then the cholesteric structure is maintained, and a fluorescent color film with a periodic structure is prepared successfully. The composite filmwith fluorescence characteristic and cholesteric structure shows the change among a plurality of optical characteristics of fluorescence, visible light and circularly polarized light in acid and baseatmospheres, and can be accurately and efficiently used for detecting acid and base gases and can be recycled.

Description

technical field [0001] The invention belongs to the technical field of optics and composite materials, relates to a gas-responsive and recyclable high-efficiency sensor, in particular to the preparation of a cholesteric cellulose nano-crystal film with fluorescence properties that is sensitive to acid and alkaline gases. Background technique [0002] With the rapid development of industrialization, various toxic and harmful gases and polluting dust are discharged into the atmosphere, which has caused great harm to human beings and the environment. Among them, the harm of acid-base waste gas is particularly serious, which is produced in many industries. Severely volatile gases such as hydrochloric acid and ammonia have always been environmental issues of global concern. Therefore, daily monitoring of acid-base gases is very important. [0003] Known traditional electrochemical gas sensors usually use metal oxides and conductive polymers as sensing materials because of their ...

Claims

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Application Information

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IPC IPC(8): C09K11/06C09K11/02G01N21/64
CPCG01N21/643C09K11/025C09K11/06C09K2211/1033C09K2211/1029
Inventor 朴光哲贺金涛
Owner QINGDAO UNIV OF SCI & TECH
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