June 18, 2021, 11:33:46 PM
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Topic: Questions about pH control, UV-visible spectrophotometer, contact angle  (Read 92 times)

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Offline Hanmin

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Hello, I'm a high school student in Korea. I'm conducting an experiment about TiO2 deposition and its performance. However, some questions arose during this experimental process ( due to the limitations of my scientific knowledge :( ). To solve this problem, I searched numerous papers from Korea and abroad, but most of them were unclear or omitted. I also sent E-mails to the researchers and tried to communicate with College students, but there's no answer for now...
Below are some of the problems I felt during the experimental process. I would like to seek advice on this. Thank you from the bottom of my heart for your reply.
(This is my first time using this site, and please understand my bad English writing. )

1) pH control of TiF4 solution
Based on the LPD (liquid phase deposition) method, I am going to deposit TiO2 on the slide glass using TiF4. Most of the studies fix pH of the TiF4 aqueous solution to 2. I would like to know if pH control is essential in LPD, and if so, how can the mole concentration of TiF4 and H+ be manipulated simultaneously?

2) Use of UV-visible spectrophotometer in solid samples
Most experiments use 'UV-visible spectrophotometer' to measure the light transmittance of glass coated with TiO2. However, as far as I know, this equipment only works for liquid samples. I want to know how this equipment can measure the light transmittance of glass.

3) Removal of contaminants during contact angle measurement
To measure the degree of contamination of TiO2, we want to measure the contact angle by placing it outside for a long time. I'm concerned that the dust which has not been removed will be swept away because of the water, causing errors in the experimental results. I'd like to ask you what the solution is.

Thank you for reading my insufficient writing...!

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