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Preparation method of nano cellulose/carbon nanotube flexible tactile sensor

A tactile sensor, nanocellulose technology, applied in sensors, catheters, measuring pulse rate/heart rate, etc., can solve the problems of high price, time-consuming, complicated preparation process, etc., and achieve low cost, high chemical stability, and preparation process. simple effect

Active Publication Date: 2019-10-08
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these microstructures are usually prepared by traditional photolithography techniques and chemical etching methods, which are complex, time-consuming and expensive.
Therefore, the preparation of low-cost, short time-consuming, simple process, and high-performance flexible tactile sensors has become a major challenge at present.

Method used

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  • Preparation method of nano cellulose/carbon nanotube flexible tactile sensor
  • Preparation method of nano cellulose/carbon nanotube flexible tactile sensor

Examples

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Effect test

Embodiment 1

[0034] A nanocellulose / carbon nanotube composite flexible tactile sensor, the preparation method is as follows:

[0035] 1) Preparation of TOCN dispersion: oxidize cellulose wood pulp into cellulose nanofibers through TEMPO-mediated oxidation. The oxidized cellulose pulp is filtered, washed with deionized water for more than 3 times, and dried to obtain TEMPO oxidized cellulose (TOC). 0.1 g of TOC was added to 99.9 g of distilled water and mechanically stirred at 1800 r / min for 10 min to obtain a 0.1 wt % TOCN dispersion.

[0036] 2) Preparation of TOCN / carbon nanotube dispersion: adding carbon nanotubes to the nanocellulose dispersion prepared above, and then mixing the two at a mass ratio of 9.0:1.0. The mixing process is to repeat stirring and ultrasonication for 3 times, each time for 50 minutes, to ensure that the two are evenly mixed.

[0037] 3) Preparation of TOCN / carbon nanotube composite flexible tactile sensor hydrogel film: pour the above-mentioned TOCN / carbon na...

Embodiment 2

[0041] A nanocellulose / carbon nanotube composite flexible tactile sensor, the preparation method is as follows:

[0042] 1) Preparation of TOCN dispersion: oxidize cellulose wood pulp into cellulose nanofibers through TEMPO-mediated oxidation. The oxidized cellulose pulp is filtered, washed with deionized water for more than 3 times, and dried to obtain TEMPO oxidized cellulose (TOC). 0.1 g of TOC was added to 99.9 g of distilled water and mechanically stirred at 1800 r / min for 10 min to obtain a 0.1 wt % TOCN dispersion.

[0043] 2) Preparation of sulfonated carbon nanotubes: first prepare the diazonium salt solution, add a certain amount of carbon nanotubes to the prepared diazonium salt solution, ensure that the temperature is stirred at 0°C for 2 hours, and then stir the reaction at room temperature 24 hours. After the reaction was completed, the mixed solution was suction-filtered with a PTFE filter membrane with a pore size of 0.22 μm. Disperse with water, acetone and...

Embodiment 3

[0048] A nanocellulose / carbon nanotube composite flexible tactile sensor, the preparation method is as follows:

[0049] 1) Preparation of TOCN dispersion: oxidize cellulose wood pulp into cellulose nanofibers through TEMPO-mediated oxidation. The oxidized cellulose pulp is filtered, washed with deionized water for more than 3 times, and dried to obtain TEMPO oxidized cellulose (TOC). 0.1 g of TOC was added to 99.9 g of distilled water and mechanically stirred at 1800 r / min for 10 min to obtain a 0.1 wt % TOCN dispersion.

[0050] 2) Preparation of TOCN / acidified carbon nanotube dispersion: add acidified carbon nanotubes to the nanocellulose dispersion prepared above, and then mix the two at a mass ratio of 9.9:0.1. The mixing process is to repeat stirring and ultrasonication for 3 times, each time for 50 minutes, to ensure that the two are evenly mixed.

[0051] 3) Preparation of TOCN / acidified carbon nanotube composite flexible tactile sensor hydrogel film: pour the above-...

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Abstract

The invention discloses a preparation method of a nano cellulose / carbon nanotube flexible tactile sensor. The nano cellulose / carbon nanotube flexible tactile sensor is made by dispersing TEMPO oxidized cellulose in water to obtain a nano cellulose dispersion, mixing well the nano cellulose dispersion with carbon nanotubes, and carrying out ion crosslinking and silk copying. Cellulose as a crystal-structured polysaccharide is the richest natural polymer on earth, is regenerable, biologically degradable and well biocompatible, and has a wide range of origins. Electronic skin herein is made fromthe renewable resource cellulose and carbon nanotubes; the preparation technique is simple, time consumption is low, and the expenditure is low; the defects of high cost and complex time-consuming process due to the use of traditional photolithography, chemical corrosion and other traditional methods are avoided; the sensor of the invention has good sensing performance, the applicable range of cellulose is widened greatly, and a new approach is provided for the research on the application of cellulose in the sensing field.

Description

technical field [0001] The invention belongs to the field of biological materials, and relates to a preparation method of a nanocellulose / carbon nanotube flexible touch sensor. Background technique [0002] Human physiological signal monitoring is considered to be an effective method for disease diagnosis and health assessment. Traditional hospital-centric healthcare sensing devices, including infrared-based optoelectronic devices and rigid multipolar pressure sensors, have been used for human physiological signal detection, but their applications are relatively limited due to their poor portability and wear resistance . Studies have proved that microstructures can effectively improve the performance of flexible tactile sensors, such as microcolumn structures, micropyramids, and microspheres have been used to prepare flexible tactile sensors. Here, we use renewable resources cellulose and carbon nanotubes as raw materials, and the composite membrane prepared is printed wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L1/04C08K3/04A61B5/02A61B5/024A61B5/11
CPCA61B5/02A61B5/024A61B5/1114C08J5/18C08J2301/04C08K2201/003C08K2201/004C08K2201/011C08K3/041
Inventor 石竹群徐海宇谢缘缘朱恩雯杨全岭熊传溪
Owner WUHAN UNIV OF TECH
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