Low-temperature adaptive conductive hydrogel based on ice structuring proteins/CaCl2 anti-freeze system as wearable strain and temperature sensor

Lu, Chunyin; Qiu, Jianhui; Zhao, Wei; Sakai, Eiichi; Zhang, Guohong; Nobe, Rie; Kudo, Makoto; Komiyama, Tomoyoshi

doi:10.1016/j.ijbiomac.2021.08.060

Cited by 46 publications

(15 citation statements)

References 32 publications

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“…Nilai suhu terhadap intensitas cahaya Gambar 2 memperlihatkan grafik hubungan antara perubahan suhu yang dibaca menggunakan termokopel dengan perubahan intensitas cahaya. Daya yang dipancarkan oleh sumber cahaya pada arah tertentu per satuan sudut disebut intensitas cahaya (Lu et al, 2021). Dari grafik terlihat bahwa perubahan suhu mempengaruhi intensitas.…”

Section: Hasil Dan Pembahasanunclassified

Termometer sederhana berbasis pada hubungan Suhu–Intensitas

Kurniasari

Toifur²,

Latifah³

2022

Berk. Fis. Indones. J. Ilm. Fis. Pembelajaran dan Apl.

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Di masyarakat, termometer yang biasa digunakan untuk mengukur suhu berbasis air raksa atau alkohol. Namun, ada beberapa kelemahan termometer air raksa atau alkohol. Termometer alkohol memiliki kelemahan yaitu dinding kaca menjadi sedikit basah, sulit membaca suhu yang diukur, dan alkohol tidak berwarna. Oleh kerena itu dibuat termometer sederhana yang memiliki keunggulan seperti pembacaan suhu yang lebih teliti, lebih aman digunakan dan bahan-bahan dalam pembuatan termometer lebih sederhana. Penelitian ini dilakukan dengan cara memvariasikan setiap lilitan kawat untuk melihat perubahan yang terjadi. Data yang diperoleh dari penelitian di Logger pro dalam bentuk grafik dan nilai yang terukur. Setalah data diperoleh data di pindahkan ke MS excel yaitu nilai t waktu, nilai dari T suhu dan I Intensitas. Hasilnya Rentang suhu yang paling baik untuk melihat kemiringan kurva adalah pada suhu 38 -100 ºC. Pada saat rentang suhu tersebut terjadi perubahan nilai yang cukup baik sehingga bisa diperoleh nilai konsistensi yang paling baik adalah pada kawat dengan 150 lilitan, nilai R 2 = 0,99 dengan persamaan y = -5.5246x + 4174,5.

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Section: Hasil Dan Pembahasanunclassified

Termometer sederhana berbasis pada hubungan Suhu–Intensitas

Kurniasari

Toifur²,

Latifah³

2022

Berk. Fis. Indones. J. Ilm. Fis. Pembelajaran dan Apl.

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“…A conductive hydrogel, a new kind of smart hydrogels with favorable processability, satisfactory flexibility, and excellent electrochemical properties, organically combines a hydrophilic matrix and conductive media. − It has broad application prospects in environmental engineering, drug delivery, medical equipment, and many other fields and is a desirable candidate for future flexible electronic devices. − Polyvinyl alcohol (PVA) is a synthetic water-soluble polymer with various favorable characteristics such as good biocompatibility, low cost, and easy availability. It has high material acceptability and is easily crosslinked and modified.…”

Section: Introductionmentioning

confidence: 99%

Chestnut-Tannin-Crosslinked, Antibacterial, Antifreezing, Conductive Organohydrogel as a Strain Sensor for Motion Monitoring, Flexible Keyboards, and Velocity Monitoring

Song

Fan

2022

ACS Appl. Mater. Interfaces

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Flexible sensing devices (FSDs) fabricated using conductive hydrogels have attracted researchers' extensive enthusiasm in recent years due to their versatility. Considering the complexity of their application environments, the integration of various functional characteristics (e.g., excellent mechanical, antibacterial, and antifreezing properties) is an important guarantee for FSDs to stably perform their applications in different environments. Herein, we developed a multifunctional conductive polyvinyl alcohol (PVA) organohydrogel PVA-CT-Ag-Al-Gly (PCAAG) by using a green, natural, and cheap biomass, chestnut tannin (CT), as a crosslinking agent, nano-silver particles (AgNPs) as an antimicrobial agent, aluminum trichloride (AlCl 3 ) as a conducting medium, and the mixed water−glycerol as the solvent system. In this organohydrogel system, CT acted not only as the reducing and stabilizing agent for the preparation of antibacterial AgNPs but also as the crosslinking agent owing to its strong multiple hydrogen bonding interactions with PVA, realizing its multifunctional application. The PCAAG organohydrogel possessed outstanding physical and mechanical properties (350.54% of the maximum fracture strain and 1.55 MPa of the maximum tensile strength), considerable bacteriostatic effects against both Escherichia coli and Staphylococcus aureus, and excellent freeze resistance (it could function normally at −20 °C). The motion-monitoring sensor based on the PCAAG organohydrogel exhibited excellent specificity recognition for both large-amplitude (e.g., elbow bending, wrist bending, finger bending, running and walking, etc.) and small-amplitude (frowning and swallowing) human movements. The flexible keyboard constructed by using the PCAAG organohydrogel could easily achieve the transformation between digital signals and electrical signals, and the signal output had both specificity and stability. The velocity-monitoring sensor fabricated by using the PCAAG organohydrogel could accurately measure the speed of the object movement (less than 3% of relative error). In short, the present PCAAG organohydrogel solves the problems of the single application environment and a few application scenarios of traditional conductive hydrogels and possesses remarkable application potential as a multifunctional FSD in many fields such as artificial intelligence, sport management, soft robots, and human−computer interface.

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“…Similarly, Lu and colleagues studied a novel antifreezing system based on ice structuring proteins where CaCl 2 was introduced to enable a conductive hydrogel with low-temperature adaptability. Supported by such an antifreezing system, the hydrogel revealed good flexibility (890% at −20 °C), recovery, and conductivity (0.50 S m –1 at −20 °C) at both room temperature and sub-zero temperature …”

Section: Introductionmentioning

confidence: 99%

“…−20 °C) at both room temperature and sub-zero temperature. 18 Natural polymers with abundance and renewability are regarded as the most promising raw materials to replace the traditionally non-degradable polymers. The use of natural polymers to fabricate hydrogels is a burgeoning area of research.…”

Section: Introductionmentioning

confidence: 99%

Antifreezing, Ionically Conductive, Transparent, and Antidrying Carboxymethyl Chitosan Self-Healing Hydrogels as Multifunctional Sensors

Gong

Zhao

Wang

et al. 2022

ACS Biomater. Sci. Eng.

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Through a simple strategy of immersion in a mixed solution of water/ethylene glycol (EG)/lithium chloride (LiCl), self-healing carboxymethyl chitosan (CA) hydrogels, that is, CA/N-vinylpyrrolidone-EG-Li+ hydrogels (CEH) with an ultra-low-temperature freezing resistance below −70 °C were fabricated. The introduction of electrolyte ions and small-molecule polyol also made these hydrogels highly conductive (0.8 S m–1) and imparted antidrying property to them, showing stable and reversible sensitivity to finger-wrist bending as well as 150 cycles of stretching. Such hydrogels also presented highly efficient self-healing ability, with a stress–strain healing efficiency of over 90%. Furthermore, the CEH-based sensors maintained a stable sensing performance over a wide range of temperatures below the freezing point (from −10 to −70 °C) and exhibited stable sensitivity to temperatures with fast response and no significant hysteresis. The present work is expected to provide a simple and sustainable route for the preparation of multifunctional antifreezing conductive hydrogels based on CA, leading to a wide range of potential applications in soft sensor devices.

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Low-temperature adaptive conductive hydrogel based on ice structuring proteins/CaCl2 anti-freeze system as wearable strain and temperature sensor

Cited by 46 publications

References 32 publications

Termometer sederhana berbasis pada hubungan Suhu–Intensitas

Termometer sederhana berbasis pada hubungan Suhu–Intensitas

Chestnut-Tannin-Crosslinked, Antibacterial, Antifreezing, Conductive Organohydrogel as a Strain Sensor for Motion Monitoring, Flexible Keyboards, and Velocity Monitoring

Antifreezing, Ionically Conductive, Transparent, and Antidrying Carboxymethyl Chitosan Self-Healing Hydrogels as Multifunctional Sensors

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