Ultra-stretchable hydrogels with reactive liquid metals as asymmetric force-sensors

2019 ◽  
Vol 6 (3) ◽  
pp. 618-625 ◽  
Author(s):  
Hao Peng ◽  
Yumeng Xin ◽  
Jun Xu ◽  
Huaizhi Liu ◽  
Jiuyang Zhang
Keyword(s):  
Liquid Metals ◽  
Polymer Networks ◽  
Synthetic Methods ◽  
Force Sensors ◽  
Hydrophilic Polymer ◽  
Sensing Applications ◽  
Reactive Liquid ◽  
Asymmetric Force

Liquid metals (LMs) are used as liquid fillers in hydrophilic polymer networks to realize ultra-stretchable hydrogels as asymmetric force-sensors. The existence of liquid metals endows the hydrogel with unique features in synthetic methods and sensing applications.

Atomically Thin Ga2S3 from Skin of Liquid Metals for Electrical, Optical, and Sensing Applications

2019 ◽  
Vol 2 (7) ◽  
pp. 4665-4672 ◽  
Author(s):  
Manal M. Y. A. Alsaif ◽  
Naresh Pillai ◽  
Sruthi Kuriakose ◽  
Sumeet Walia ◽  
Azmira Jannat ◽  
...  
Keyword(s):  
Liquid Metals ◽  
Sensing Applications

scholarly journals Immobilization of myoglobin from horse skeletal muscle in hydrophilic polymer networks

2007 ◽  
Vol 107 (2) ◽  
pp. 881-890 ◽  
Author(s):  
Angelines Castro-Forero ◽  
David Jiménez ◽  
Juan López-Garriga ◽  
Madeline Torres-Lugo
Keyword(s):  
Skeletal Muscle ◽  
Polymer Networks ◽  
Hydrophilic Polymer

scholarly journals Architectured Shape-Memory Hydrogels with Switching Segments Based on Oligo(ε-caprolactone)

MRS Advances ◽  
2016 ◽  
Vol 1 (27) ◽  
pp. 2011-2017 ◽  
Author(s):  
Maria Balk ◽  
Marc Behl ◽  
Ulrich Nöchel ◽  
Andreas Lendlein
Keyword(s):  
Shape Memory ◽  
Material Properties ◽  
Biomedical Applications ◽  
Polymer Networks ◽  
Hydrophilic Polymer ◽  
Potential Candidate ◽  
Thermal Crosslinking ◽  
Porous Microstructure ◽  
Image Position ◽  
Form Stability

ABSTRACTShape-memory hydrogels (SMHs) are potential candidate materials for biomedical applications as they can mimic the elastic properties of soft tissue and exhibit shape transformations at body temperature. Here we explored, whether architectured SMHs can be designed by incorporating oligo(ε-caprolactone) (OCL, ${\overline M _n}$ = 4500 g·mol-1, Tm = 54 °C) side chains as switching segment into hydrophilic polymer networks based on N-vinylpyrrolidone as backbone forming component and oligo(ethylene glycol)divinylether (OEGDVE, ${\overline M _n}$ = 250 g·mol-1) as crosslinker. By utilizing NaCl and NaHCO3 as porogene during thermal crosslinking architectured hydrogels having pore diameters between 30 and 500 µm and wall thicknesses ranging from 10 to 190 µm in the swollen state were synthesized. According to the porous microstructure, a macroscopic form stability was obtained when the polymer networks were swollen until equilibrium in water. Material properties were investigated as function of the OCL content, which was varied between 20 and 40 wt%. In compression experiments the architectured hydrogels exhibited strain fixity and strain recovery ratios above 80%. These architectured SMHs might enable biomaterial applications as smart implants with the recovery of bulky structures from compact shapes.

Expanding the Horizons of Wireless Sensing

2022 ◽  
Vol 25 (3) ◽  
pp. 38-42
Author(s):  
Agrim Gupta ◽  
Cédric Girerd ◽  
Manideep Dunna ◽  
Qiming Zhang ◽  
Raghav Subbaraman ◽  
...  
Keyword(s):  
Force Sensor ◽  
Physical World ◽  
Contact Forces ◽  
Force Sensors ◽  
Force Measurements ◽  
Tissue Phantom ◽  
Ubiquitous Sensing ◽  
Sensing Applications ◽  
Communication Paradigm ◽  
Critical Requirement

All interactions of objects, humans, and machines with the physical world are via contact forces. For instance, objects placed on a table exert their gravitational forces, and the contact interactions via our hands/feet are guided by the sense of contact force felt by our skin. Thus, the ability to sense the contact forces can allow us to measure all these ubiquitous interactions, enabling a myriad of applications. Furthermore, force sensors are a critical requirement for safer surgeries, which require measuring complex contact forces experienced as a surgical instrument interacts with the surrounding tissues during the surgical procedure. However, with currently available discrete point-force sensors, which require a battery to sense the forces and communicate the readings wirelessly, these ubiquitous sensing and surgical sensing applications are not practical. This motivates the development of new force sensors that can sense, and communicate wirelessly without consuming significant power to enable a battery-free design. In this magazine article, we present WiForce, a low-power wireless force sensor utilizing a joint sensing-communication paradigm. That is, instead of having separate sensing and communication blocks, WiForce directly transduces the force measurements onto variations in wireless signals reflecting WiForce from the sensor. This novel trans-duction mechanism also allows WiForce to generalize easily to a length continuum, where we can detect as well as localize forces acting on the continuum. We fabricate and test our sensor prototype in different scenarios, including testing beneath a tissue phantom, and obtain sub-N sensing and sub-mm localizing accuracies (0.34 N and 0.6 mm, respectively).

Soluble chain fractions in hydrophilic polymer networks: origin and effect on dynamic uptake overshoots

Polymer ◽  
1990 ◽  
Vol 31 (7) ◽  
pp. 1288-1293 ◽  
Author(s):  
Alec B. Scranton ◽  
John Klier ◽  
Nikolaos A. Peppas
Keyword(s):  
Polymer Networks ◽  
Hydrophilic Polymer

Liquid metals in plastics for super-toughness and high-performance force sensors

2020 ◽  
Vol 399 ◽  
pp. 125732 ◽  
Author(s):  
Yang Lou ◽  
Huaizhi Liu ◽  
Jiuyang Zhang
Keyword(s):  
High Performance ◽  
Liquid Metals ◽  
Force Sensors

scholarly journals Design of dual hydrophobic–hydrophilic polymer networks for highly lubricious polyether-urethane coatings

2019 ◽  
Vol 111 ◽  
pp. 82-94 ◽  
Author(s):  
Peter T.M. Albers ◽  
Stefan P.W. Govers ◽  
Jozua Laven ◽  
Leendert G.J. van der Ven ◽  
Rolf A.T.M. van Benthem ◽  
...  
Keyword(s):  
Polymer Networks ◽  
Hydrophilic Polymer

Wetting of TiC by non-reactive liquid metals

2002 ◽  
Vol 50 (2) ◽  
pp. 237-245 ◽  
Author(s):  
N Frage ◽  
N Froumin ◽  
M.P Dariel
Keyword(s):  
Liquid Metals ◽  
Reactive Liquid
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