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Preparation of biocompatible conductive hydrogel capable of being used for electroencephalogram signal sensor
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A conductive hydrogel and acrylamide technology, applied in the field of biosensors, can solve the problems of spiked electrodes increasing the risk of infection and inflammatory reactions, reducing interface impedance, and complicated processes, achieving good non-toxicity and harmlessness, reducing Impedance, non-dissipating effect
Pending Publication Date: 2021-12-21
DALIAN UNIV OF TECH
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Among them, the micro-tip electrodes in the dry electrodes can greatly reduce the interface impedance and establish stable skin contact, but the spike electrodes increase the risk of infection and inflammatory reactions
The traditional bioelectric potential acquisition relies on the use of standard silver / silver chloride wet electrodes, and the use of conductive paste containing chloride ions can greatly reduce the impedance of the scalp, but the use of conductive paste requires professional personnel to clean the skin Preparation, and cleaning is required after signal acquisition, the process is complex and time-consuming
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Embodiment 1
[0029] A preparation method of conductive hydrogel, comprising the following steps:
[0030] (1) Mix 0.5g of sodium alginate monomer and 3g of acrylamidemonomer, dissolve evenly in 15mL of deionized water, and sonicate until the air bubbles are removed;
[0031] (2) Dissolve 4mg of N,N'-methylenebisacrylamide, 10mg of ammoniumpersulfate, 65mg of calciumsulfate, and 225mg of potassiumchloride in 10mL of deionized water, and ultrasonically remove air bubbles;
[0033] (4) Mix the above three solutions quickly and evenly, pour them into a mold made of transparent resin, irradiate them under two 254nm, 18w ultraviolet lamps for 1 hour, then place the mold in an oven at 65°C for 2 hours, After standing still for 12 hours, a conductive hydrogel sample was obtained.
Embodiment 2
[0035] Discussion experiment on the effect of glycerol component in the hydrogel
[0036] The preparation method of embodiment 2 is substantially the same as embodiment 1, the difference is:
[0037] In step (3), the glycerin in the embodiment 1 is replaced with the same volume of deionized water.
[0038] In order to explore the role of glycerol in this system, the moisture retention properties of the conductive hydrogel samples prepared in Example 1 and Example 2 were measured. The specific test conditions were: the conductive hydrogel samples were placed at room temperature, and measured respectively The quality of example 1 and embodiment 2 when 0, 15, 30, 60, 120, 180, 240, 360, 540, 720, 1440min, with time as abscissa, the quality difference between embodiment 1 and embodiment 2 is vertical Coordinates, test results such as figure 1 shown.
[0039] Depend on figure 1 It can be seen that compared with Example 2, the addition of glycerol in Example 1 slows down the los...
Embodiment 3
[0041] Discussion on the role of PEDOT / PSS in this conductive hydrogel:
[0042] The preparation method of embodiment 3 is substantially the same as embodiment 1, the difference is:
[0043] In step (3), the PEDOT / PSS in Example 1 is replaced with deionized water of the same volume.
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technical field [0001] The invention belongs to the field of biosensors, and in particular relates to a preparation method of a biocompatible conductive hydrogel which can be used for an EEG signal sensor. Background technique [0002] A biopotential signal is the action potential of a cell or the average electrical activity of a group of cells, which can be detected at various locations in the human body. The EEG signal is the signal that the average activity of brain cells is collected on the scalp. All human physiological and psychological activities are controlled by the brain, so these information will be reflected in the EEG. From this point of view, it is possible to collect EEG signals with high quality and convenience, which is very useful for studying human cognition and evaluating subjects. The health status and monitoring of their mental state are of great significance. Electrodes of EEG sensors currently used for collecting EEG signals include dry electrodes, ...
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