I have micron-scale fillers (>10um) that I would like to utilize in a spin coating solution. I have been utilizing different chemical pathways to convert the initial filler product into a sol-gel solution. However, the particle size appears to be the same within my produced spin coating solution.
Would this particle size work within a spin coating procedure or does the initial filler size need to be in the nanoscale range? If it would work, do I need to tailor the spin speed to the particle size? If so, would getting to this tailored speed be trial and error, or is there a more sustainable way to get to my intended results. Thanks for your response in advance.
As the particle size decreases you can form thinner film by spin coating. Then it depends on the film thickness required. I assume the film thickness may be multiple particulate size to have full coverage and uniformity.
As grain size decreases you can control better the morphology and the thickness uniformity of the the deposited layer.
The nano scale helps you produce more thinner and and more homogeneous film.
This is a straight forward consequence of constructing the film from the grains.
Best wishes
Tyler Sonsalla You spin down solutions or gels not particles for spin or dip coating. The thin film is then generated by drying and a heat treatment to generate the appropriate compound.
Alan F Rawle My apologies that my question was not clearer. I was following the procedures outlined in the following papers:
http://homepages.rpi.edu/~duttap/Publications/2006JEM35.pdf
https://iopscience.iop.org/article/10.1088/1742-6596/1116/3/032020/pdf
Could you perhaps determine what may be going wrong with my process? My process was as follows:
1. Zinc powder (-100 mesh) converted to zinc acetate (have EDX of product if necessary) via acetic acid and agitation/heating in flask
2. Acetic acid is decanted from the top of the solution with products at the bottom, and a rotovap was utilized to remove the residual acetic acid
3. Zinc acetate (1g), stearic acid (0.26g), and ethanol (100 mL) were combined in a round bottom flask and placed in a water bath and heated to 80 C for 1 hour
4. After one hour of heating, the resulting solution has a milky white translucent look to it. However, there were particles at the bottom. Hence, my usage of particles in the initial question.
Please let me know what you think. Thanks.
Yes to get cohesive, uniform film the particles have to be distributed or embedded uniformly but up to a certain critical limit. The film formed will be more cohesive and stable if the particles are in the nanoscale as well as the method parameters governing film formation.
As the particle size decreases you can form thinner film by spin coating. Then it depends on the film thickness required. I assume the film thickness may be multiple particulate size to have full coverage and uniformity.
As grain size decreases you can control better the morphology and the thickness uniformity of the the deposited layer.
The nano scale helps you produce more thinner and and more homogeneous film.
This is a straight forward consequence of constructing the film from the grains.
Best wishes
- Badges
- Science topic
- Similar topics
- Chemistry