Impedance spectroscopy of KBr: Difference between revisions

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==Materials==
==Materials==
1. Thin, Lightweight Rod (~ 1 m in length)
1. Electrochemical Impedance Spectroscopy (EIS) System


2. Small Lead or Steel Spheres (~ 1 to 5 cm in diameters)
2. KBr samples


3. Large Lead or Steel Spheres (~ 20 cm in diameters)
3. Two-electrode system


4. Copper Wire (~0.05 mm in diameter ~ 30cm in length)
4. Frequency generator


5. Small Mirror
==Procedure==
 
1. Sample Preparation: Prepare the KBr samples for testing. This may involve grinding KBr into a fine powder and pressing it into a pellet.
 
2. Electrode Setup: Set up the two-electrode system. One electrode is placed on either side of the KBr sample.
 
3. Impedance Measurement: Connect the KBr sample to the EIS system. Apply a small perturbation signal, and measure the impedance over a range of frequencies.


6. Laser
4. Data Collection: Record the impedance data at each frequency.


7. Ruler or Photodiode array to measure the angle
5. Data Analysis: Analyze the collected data using appropriate software or mathematical models. This includes creating Nyquist or Bode plots to visualize the data and fitting the data to an equivalent circuit model.


8. Stable, Vibration-Free Mount
==Timeline==
==Procedure==
{| class="wikitable" style="margin:auto"
1. Set Up the Torsion Balance:
|+ Timeline
  - Attach the smaller spheres to each end of the rod.
|-
  - Suspend the rod horizontally from its center using the torsion wire. The wire should be attached securely to a stable mount.
| 5/3 || Learn how to do the Impedance spectrocopy and how to palletize samples ||
  - Attach the mirror to the wire just below the mount.
|-
2. Prepare the Large Spheres:
| 7/3 || Palletize powdered KBr ||
  - Position the larger spheres near the smaller ones.
|-
3. Set Up the Laser and Photodiode Array:
| 12/3 || Patelletize KBr into different thicknesses ||
  - Position the laser so that it shines on the mirror.
|-
  - Set up the photodiode array at an appropriate distance so that it can detect the laser light reflected from the mirror.
| 14/3 || Silver paint both sides of the pallets||
4. Calibrate the Photodiode Array:
|-
  - Shine the laser on each photodiode in the array and record the output. This will give you a calibration curve that you can use to convert photodiode signals into angles of rotation.
| 19/3 || 1st attempt on the impedance spectroscopy across different temperatures ||
5. Perform the Experiment:
|-
  - Carefully move the larger spheres closer to the smaller ones. The gravitational attraction will cause the rod to twist, turning the mirror and shifting the laser spot on the photodiode array.
| 20/3 || final attempt on the impedance spectroscopy across different temperature from 50C - 255C of the pallet with diameter 11.4 mm and thickness 2.61 mm  ||
  - Record the photodiode output at regular intervals.
|-
6. Data Analysis:
| 21/3 || Do the impedance spectroscopy while applying bias DC voltage from 0V to 5V of the pallet with diameter 11.7 mm and thickness 3.54 mm and do the impedance spectroscopy on the pallets with different thicknesses||
  - Use your calibration curve to convert the photodiode signals into angles of rotation.
|-
  - Calculate the gravitational constant using the observed rotation, the known mass of the spheres, and the properties of the torsion wire.
| 26/3 || Fit the nyquist plot of the temperature data with a semi circle to get approximated resistance and capacitance||
|-
| 2/4 ||  Discuss the result and fit the DC dependent data with semi circle||
|-
| 4/4 ||  Analyze the data and discuss||
|-
| 9/4 ||  Discuss the possible mechanism of phase transition and updating wiki page||
 
|}

Latest revision as of 11:38, 9 April 2024

Team members

Laphas Precmcharoen, Song Runlin, Gao Jia

Idea

This project aims to study the electrical properties of Potassium Bromide (KBr) using impedance spectroscopy.

Materials

1. Electrochemical Impedance Spectroscopy (EIS) System

2. KBr samples

3. Two-electrode system

4. Frequency generator

Procedure

1. Sample Preparation: Prepare the KBr samples for testing. This may involve grinding KBr into a fine powder and pressing it into a pellet.

2. Electrode Setup: Set up the two-electrode system. One electrode is placed on either side of the KBr sample.

3. Impedance Measurement: Connect the KBr sample to the EIS system. Apply a small perturbation signal, and measure the impedance over a range of frequencies.

4. Data Collection: Record the impedance data at each frequency.

5. Data Analysis: Analyze the collected data using appropriate software or mathematical models. This includes creating Nyquist or Bode plots to visualize the data and fitting the data to an equivalent circuit model.

Timeline

Timeline
5/3 Learn how to do the Impedance spectrocopy and how to palletize samples
7/3 Palletize powdered KBr
12/3 Patelletize KBr into different thicknesses
14/3 Silver paint both sides of the pallets
19/3 1st attempt on the impedance spectroscopy across different temperatures
20/3 final attempt on the impedance spectroscopy across different temperature from 50C - 255C of the pallet with diameter 11.4 mm and thickness 2.61 mm
21/3 Do the impedance spectroscopy while applying bias DC voltage from 0V to 5V of the pallet with diameter 11.7 mm and thickness 3.54 mm and do the impedance spectroscopy on the pallets with different thicknesses
26/3 Fit the nyquist plot of the temperature data with a semi circle to get approximated resistance and capacitance
2/4 Discuss the result and fit the DC dependent data with semi circle
4/4 Analyze the data and discuss
9/4 Discuss the possible mechanism of phase transition and updating wiki page
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