A sensitive and flexible interdigitated capacitive strain gauge based on carbon nanofiber/PANI/silicone rubber nanocomposite for body motion monitoring

Hosseini, Seyedmajid; Hajghassem, Hassan; Ghazani, Masoud Faraghi

doi:10.1088/2053-1591/ac7851

Cited by 10 publications

(6 citation statements)

References 62 publications

(72 reference statements)

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“…Composite PLGA/Fibrin, PLGA/Lignin, and PLGA/Fibrin/Lignin nanofibrous scaffolds exhibited weaker mechanical properties (stiffness and tensile strength) compared to pure PLGA scaffold, and by increasing the proportion of lignin and fibrin, their tensile strength and stiffness decreased, probably due to the reduction of the diameter of the fibers. Given their adjustable mechanical properties, these nanofibrous scaffolds could be considered appropriate candidates for engineering various tissues (table 3), wound dressing, and also as stretchable strain sensors [63].…”

Section: Mechanical Analysis Resultsmentioning

confidence: 99%

Characterization and biological evaluation of new PLGA/fibrin/lignin biocomposite electrospun scaffolds

Norouzi¹,

Rafienia²,

Hosseini³

2023

Phys. Scr.

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In this study, we produced electrospun scaffolds from 10% pure PLGA solution, and 10% polyblend solutions of PLGA/Fibrin, PLGA/Lignin, and PLGA/Fibrin/Lignin with proportions of 9:1, 8:2, 7:3, 7:2:1, 6:2:2, and 5:2:3 and characterized them physiochemically and biologically. FTIR and EDX results verified the chemical composition of the fibers. All scaffolds exhibited homogenous nanostructures with fiber diameters ranging from 0.1 to 2.5 µm and the highest average fiber diameter belonged to PLGA/Lignin fibers. Increasing the lignin proportion led to a decrease in fibers diameter and a change in color to brown. Fibrin improved the hydrophobicity of the scaffolds, and the incorporation of fibrin, lignin, or fibrin/lignin improved the absorption capacity of the scaffolds (up to 91.7%). From day 45 onwards, fibrin-containing scaffolds started to degrade much faster. By day 90, PLGA/20%Fibrin/30%Lignin showed the highest degradation ratio of 82%, while PLGA/10%Lignin showed the lowest at 51.4%. All scaffolds exhibited high porosity percentage (over 78%), with porosity enhanced by increasing fibrin and decreasing lignin. The pure PLGA scaffold and PLGA/10%Lignin showed the highest stiffness and tensile strength, respectively. The addition of natural components gradually decreased the scaffolds' tensile strength and fracture strain. MTT results showed higher absorbance reading at 490 nm for PLGA, PLGA/10%Fibrin, and all three PLGA/Lignin scaffolds from day 3 to day 7. On day 7, PLGA/10%Fibrin exhibited the highest cell viability, followed by PLGA/10%Lignin and PLGA/20%Fibrin/10%Lignin. SEM micrographs revealed the presence of h-ADSCs with spindle-like morphologies, attached and proliferated well on all scaffolds. PLGA/10%Fibrin, PLGA/10%Lignin, and PLGA/20%Fibrin/10%Lignin were selected as the preferred options from each set of scaffolds. Among them, PLGA/20%Fibrin/10%Lignin exhibited superior physical features and actively enhanced the biological responses of the cells due to its physio-mechanical signals and the advanced features of lignin, making it suitable for tissue engineering, wound dressing, drug delivery, and other biomedical applications.

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Section: Mechanical Analysis Resultsmentioning

confidence: 99%

Characterization and biological evaluation of new PLGA/fibrin/lignin biocomposite electrospun scaffolds

Norouzi¹,

Rafienia²,

Hosseini³

2023

Phys. Scr.

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“…In recent years, capacitive pressure sensors based on conjugated polymers have been widely reported [ 103 , 104 ]. For example, a stretchable interleaved capacitive strain sensor based on carbon nanofiber/polyaniline/silicone rubber nanocomposite was developed by Hajghassem et al [ 105 ]. In their work, highly conductive PANI was first coated with carboxyl-functionalized carbon nanofibers (CNFs) to prepare functionalized CNF-PANI composites, mixed with silicone rubber, and finally transferred to a mold to prepare electrodes with nanocomposite structures.…”

Section: Advances In Pressure Sensors Based On Conjugated Polymer Nan...mentioning

confidence: 99%

Conjugated Polymer-Based Nanocomposites for Pressure Sensors

et al. 2023

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Flexible sensors are the essential foundations of pressure sensing, microcomputer sensing systems, and wearable devices. The flexible tactile sensor can sense stimuli by converting external forces into electrical signals. The electrical signals are transmitted to a computer processing system for analysis, realizing real-time health monitoring and human motion detection. According to the working mechanism, tactile sensors are mainly divided into four types—piezoresistive, capacitive, piezoelectric, and triboelectric tactile sensors. Conventional silicon-based tactile sensors are often inadequate for flexible electronics due to their limited mechanical flexibility. In comparison, polymeric nanocomposites are flexible and stretchable, which makes them excellent candidates for flexible and wearable tactile sensors. Among the promising polymers, conjugated polymers (CPs), due to their unique chemical structures and electronic properties that contribute to their high electrical and mechanical conductivity, show great potential for flexible sensors and wearable devices. In this paper, we first introduce the parameters of pressure sensors. Then, we describe the operating principles of resistive, capacitive, piezoelectric, and triboelectric sensors, and review the pressure sensors based on conjugated polymer nanocomposites that were reported in recent years. After that, we introduce the performance characteristics of flexible sensors, regarding their applications in healthcare, human motion monitoring, electronic skin, wearable devices, and artificial intelligence. In addition, we summarize and compare the performances of conjugated polymer nanocomposite-based pressure sensors that were reported in recent years. Finally, we summarize the challenges and future directions of conjugated polymer nanocomposite-based sensors.

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“…1(c). 41,42 2.3 Overview of piezoelectric strain sensors with performance Piezoelectric-based strain sensors are commonly used in structural health monitoring of bridges, buildings, and aircraft, where they can detect small changes in strain that may indicate the onset of structural damage or failure. They are also used in vibration analysis, where they can measure the vibrations of rotating machinery and other mechanical systems.…”

Section: Overview Of Capacitive Strain Sensors With Performancementioning

confidence: 99%

The technology of wearable flexible textile-based strain sensors for monitoring multiple human motions: construction, patterning and performance

Liza,

Kabir,

Jiang

et al. 2023

Sens. Diagn.

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A sensitive and flexible interdigitated capacitive strain gauge based on carbon nanofiber/PANI/silicone rubber nanocomposite for body motion monitoring

Cited by 10 publications

References 62 publications

Characterization and biological evaluation of new PLGA/fibrin/lignin biocomposite electrospun scaffolds

Characterization and biological evaluation of new PLGA/fibrin/lignin biocomposite electrospun scaffolds

Conjugated Polymer-Based Nanocomposites for Pressure Sensors

The technology of wearable flexible textile-based strain sensors for monitoring multiple human motions: construction, patterning and performance

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