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Related Concept Videos

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The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
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Equivalent Capacitance01:19

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From the study of resistive circuits, it is understood that employing a series-parallel combination serves as an effective strategy for simplifying circuits. Capacitors can be arranged within a circuit in one of two ways: a series configuration or a parallel configuration. The way these capacitors are connected to a battery will influence both the potential drop across each individual capacitor and the size of the charge that each capacitor can store. This is determined by the specific type of...
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Equivalent Capacitance01:19

Equivalent Capacitance

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Multiple capacitors can be connected in a circuit in series or parallel configuration. When the capacitor combination is connected to a battery, the potential drop across each capacitor and the magnitude of charge stored in the individual capacitor depends on the type of the connection. The capacitor combination is replaced by a single equivalent capacitor that stores the same amount of charge as the combination for a given potential difference.
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Capacitors and Capacitance01:18

Capacitors and Capacitance

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A device consisting of two electrical conductors that are separated by a distance and used to store electrical charges is called a capacitor. The space between the conductors is either a vacuum or an insulating material, called a dielectric. Capacitors have many applications, ranging from filtering static from radio reception to energy storage in heart defibrillators.
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Ionic Crystal Structures02:42

Ionic Crystal Structures

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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
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Crystal Field Theory - Octahedral Complexes02:58

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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
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Related Experiment Video

Updated: Feb 3, 2026

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
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Wireless Temperature Sensor Based on a Nematic Liquid Crystal Cell as Variable Capacitance.

Juan Carlos Torres1, Braulio García-Cámara2, Isabel Pérez3

  • 1Displays and Photonic Applications Group (GDAF-UC3M), Electronic Technology Department, Carlos III University of Madrid, Av de la Universidad 30, E28911 Leganés, Spain. jctzafra@ing.uc3m.es.

Sensors (Basel, Switzerland)
|October 17, 2018
PubMed
Summary
This summary is machine-generated.

A novel wireless temperature sensor utilizes liquid crystals for variable capacitance, offering a flexible and cost-effective solution for Internet of Things (IoT) applications, particularly in wearable biomedical sensing.

Keywords:
capacitive sensorequivalent circuitimpedance analysisnematic liquid crystalsimulationtemperature dependence

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Biomedical Engineering

Background:

  • Rapid advancements in wireless communication enable technologies such as the Internet of Things (IoT).
  • Smart sensors integrated with wireless capabilities reduce installation and system costs, enhancing flexibility and deployment.
  • Wireless sensors open new application possibilities previously unattainable with wired systems.

Purpose of the Study:

  • To propose and demonstrate a wireless temperature sensor concept utilizing a nematic liquid crystal as a variable capacitor.
  • To evaluate the performance of the proposed wireless temperature sensor.
  • To explore potential applications in wearable technology and biomedical sensing.

Main Methods:

  • Fabrication of a sensor prototype based on a nematic liquid crystal variable capacitor.
  • Performance analysis of the wireless temperature sensor.
  • Development of a simple equivalent circuit model for the sensor.

Main Results:

  • Successful fabrication and demonstration of the wireless temperature sensor prototype.
  • Characterization of sensor performance, validating its functionality.
  • Proposal of an equivalent circuit model to describe sensor behavior.

Conclusions:

  • The liquid crystal-based wireless temperature sensor serves as a viable proof of concept.
  • This technology holds promise for cost-effective and flexible wearable biomedical sensing applications.
  • The developed sensor represents a foundational step towards novel biomedical sensing solutions.