A flexible and stretchable hydrogel optical fiber sensor and its preparation and application

An optical fiber and hydrogel technology, applied in the directions of cladding fiber, optical waveguide light guide, fiber chemical characteristics, etc., can solve problems such as unfavorable use, instability, and easy water loss signal transmission, and achieve low production cost and optical transmission. The effect of stable signal and simple operation process

Active Publication Date: 2021-07-02
DONGHUA UNIV
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a flexible and stretchable hydrogel optical fiber sensor and its preparation and application, which overcomes the instability of signal transmission caused by the extremely easy loss of water in the hydrogel optical fiber sensor in the prior art, which is not conducive to the in vitro environment Technical flaws used under

Method used

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  • A flexible and stretchable hydrogel optical fiber sensor and its preparation and application
  • A flexible and stretchable hydrogel optical fiber sensor and its preparation and application
  • A flexible and stretchable hydrogel optical fiber sensor and its preparation and application

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preparation example Construction

[0030] The preparation of lithium bromide aqueous solution in the embodiment:

[0031] Move the weighed anhydrous lithium bromide into deionized water, shake to dissolve and then ultrasonically remove air bubbles. Such as figure 1 As shown, with the increase of lithium bromide concentration, the refractive index of lithium bromide aqueous solution also increases. Among them, the measurement of the refractive index uses a Japanese ATAGO PAL-RI digital display refractometer.

[0032] Preparation of acrylamide aqueous solution containing lithium bromide:

[0033] Transfer the weighed acrylamide monomer into lithium bromide aqueous solution, shake to dissolve, and then ultrasonically remove air bubbles. Such as figure 2 As shown, the refractive index of the hydrogel containing lithium bromide is higher, and all of them increase with the increase of the concentration.

Embodiment 1

[0035] Prepare 7mL of 50wt% lithium bromide (refractive index 1.4316), (purchased from Titan Technology Company, product number is 01112263) mixed with 3g of acrylamide (purchased from Sigma Company, product number is V900845), and then add 0.0045g of Photoinitiator 2,2'-azobisisobutyramide hydrochloride (purchased from Sigma Company, product number is 440914) and 0.012g of cross-linking agent N,N'-methylenebisacrylamide (purchased from Sigma Company , item number 146072). Then the mixed solution was injected into a transparent silica gel capillary (purchased from Shanghai Shenhui Rubber and Plastic Products Factory), and cured by ultraviolet light for 2 minutes to obtain an optical fiber of transparent silica gel capillary / polyacrylamide hydrogel containing lithium bromide (refractive index 1.4221).

Embodiment 2

[0037] Prepare 7mL of 50wt% lithium bromide (refractive index 1.4320) and mix with 3g of acrylamide, then add 0.0045g of photoinitiator 2,2'-azobisisobutylamidine hydrochloride and 0.012g of Linking agent N, N'-methylenebisacrylamide. Then the mixed solution was poured into a transparent silica gel capillary, and cured by ultraviolet light for 2.5 minutes to obtain an optical fiber of transparent silica gel capillary / polyacrylamide hydrogel containing lithium bromide (refractive index 1.4233).

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Abstract

The invention relates to a flexible and stretchable hydrogel optical fiber sensor and its preparation and application. The optical fiber has a skin-core structure, wherein the skin layer is a transparent silica gel capillary; the core layer is polyacrylamide hydrogel containing lithium bromide. Acrylamide is dissolved in lithium bromide aqueous solution and then injected into a silica gel tube for polymerization, and the obtained hydrogel optical fiber can respond to external environmental stimuli. The hydrogel optical fiber sensor prepared by the invention has the characteristics of simple preparation, flexibility and stretchability, sensitive pressure sensing, stable signal transmission, etc., and thus has the potential of large-scale preparation and broad commercial application prospects.

Description

technical field [0001] The invention belongs to the field of optical fiber and its preparation and application, in particular to a flexible and stretchable hydrogel optical fiber sensor and its preparation and application. Background technique [0002] Nowadays, most of the sensors based on electrical signal detection detect the data of changes in current, resistance or capacitance caused by external stimuli such as human movement and environmental temperature changes. However, this kind of sensor has great disadvantages. For example, during use, the electrical signal detected by the sensor is susceptible to electromagnetic interference, thereby causing loss or confusion of the signal. Compared with traditional electronic sensors, sensors based on optical signals have the advantages of light weight, no electromagnetic interference, and high sensitivity. Traditional optical fiber sensors such as commercialized Fiber Bragg Grating (Fiber Bragg Grating, FBG) and "Lab-on-Fiber"...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F8/10D01F8/16D01F1/10C08F220/56C08F222/38C08F2/48C08F2/44C08J3/075G02B6/02C08L33/26
Inventor 王成敏孙胜童武培怡
Owner DONGHUA UNIV
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