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Sensory receptors play an integral part in comprehending our external and internal environments. They receive diverse stimuli, converting them into the nervous system's electrochemical signals. This conversion occurs as the stimulus alters the sensory neuron's cell membrane potential, instigating the generation of an action potential. This action potential is subsequently transmitted to the central nervous system (CNS), which integrates with other sensory data or higher cognitive...
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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
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A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
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Optoionic Sensing.

Baohong Chen1, Zhigang Suo1

  • 1John A. Paulson School of Engineering and Applied Sciences, Kavli Institute for Bionano Science and Technology, Harvard University, Cambridge, MA, 02138, USA.

Small (Weinheim an Der Bergstrasse, Germany)
|December 1, 2021
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Summary
This summary is machine-generated.

Researchers mimicked the eye's optical-to-ionic signal conversion using photodiodes and hydrogels. This optoionic transduction technology shows potential for advanced wearable and implantable devices.

Keywords:
ionic conductorsneuromuscular junctionsphotodiodesphotoreceptorsstretchable sensors

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Neuroscience

Background:

  • The human eye performs optoionic transduction, converting light into ionic signals.
  • Existing technologies lack efficient methods for mimicking this biological process.
  • Developing artificial systems for light-to-ionic signal conversion is crucial for bio-integrated electronics.

Purpose of the Study:

  • To develop an artificial optoionic transduction system using a photodiode and hydrogels.
  • To mimic the signal transduction mechanism of the human eye.
  • To explore potential applications in wearable devices, implantable devices, and robotics.

Main Methods:

  • Utilized a photodiode in contact with ionic conductors (hydrogels) to mimic biological optoionic transduction.
  • Investigated the capacitive coupling at the photodiode/hydrogel interface.
  • Engineered stretchable and biocompatible hydrogels.
  • Demonstrated photosensitive skin and actuation mimicking biological reflexes.

Main Results:

  • Achieved optoionic transduction by generating electron-hole pairs in the photodiode, inducing ion movement in hydrogels.
  • Observed a voltage response within 10 ms upon light stimulation, comparable to the human eye.
  • Developed a photosensitive skin that generates voltage in response to light, not stretch.
  • Demonstrated light-triggered actuation mimicking eye blinking and skin camouflage.

Conclusions:

  • Optoionic transduction can be effectively mimicked using photodiode-hydrogel systems.
  • The developed system exhibits rapid response times and biocompatibility.
  • This technology holds significant promise for developing advanced optoionic devices for various applications.