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Alkali Metals03:06

Alkali Metals

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Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
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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

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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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Vapor Pressure02:34

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When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules move randomly about, they will occasionally collide with the surface of the condensed phase, and in some cases, these collisions will result in the molecules re-entering the condensed phase. The change from the gas phase to the liquid is called condensation. When the rate of condensation becomes equal to the rate of vaporization, neither the amount of the liquid nor the amount of the vapor...
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Bonding in Metals02:32

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Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”. 
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Author Spotlight: Microfluidic Channel-Based Soft Electrodes and Their Application in Capacitive Pressure Sensing
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A liquid metal based capacitive soft pressure microsensor.

Xuyan Zhou1, Renchang Zhang, Luojia Li

  • 1Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China. lingui@mail.ipc.ac.cn.

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|January 26, 2019
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Summary
This summary is machine-generated.

A novel liquid-metal capacitive soft pressure microsensor accurately measures microchannel pressure. This implantable device shows promise for continuous blood and intraocular pressure monitoring in clinical applications.

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Area of Science:

  • Microfluidics
  • Biomedical Engineering
  • Sensor Technology

Background:

  • Accurate pressure measurement in microchannels is crucial for various applications.
  • Existing microsensors often face limitations in sensitivity, stability, or biocompatibility for in-vivo use.

Purpose of the Study:

  • To develop and validate a liquid-metal based capacitive soft pressure microsensor for microchannel applications.
  • To assess the sensor's performance for in-vivo blood pressure measurement.

Main Methods:

  • Fabrication of a detection channel with a sealed reference fluid segment.
  • Integration of liquid metal electrodes and shielding layers for capacitance measurement.
  • In-vitro testing in microfluidic systems and in-vivo testing on rabbit carotid arteries.

Main Results:

  • Demonstrated excellent stability and linear correlation between capacitance and fluid pressure.
  • Achieved a pressure resolution of 7.5 mmHg within a range of 20-300 mmHg.
  • Successful in-vivo measurement of rabbit carotid artery blood pressure.

Conclusions:

  • The liquid-metal capacitive soft pressure microsensor offers a promising approach for accurate microchannel pressure sensing.
  • The technology holds potential for developing implantable devices for continuous blood or intraocular pressure monitoring.
  • This sensor design addresses key challenges in developing next-generation biomedical monitoring devices.