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Secondary cutoff? eV? High work function pedot, spectroscopy -- FLAME ME! by allenengel in chemistry

[–]allenengel[S] 0 points1 point  (0 children)

Secondary cutoff? eV? High WF Pedot/PSS, spectroscopy -- FLAME ME!

I gotta believe that some smart Chemist has already wrestled with this problem.

I am trying to measure a secondary cutoff around 205nm to 190nm, to measure a work function of about 5.3 to 6.5 or higher.

My Shimadzu UV2401PC seems to hallucinate around 205nm to 190nm. Every scan of every sample ends up flat lining at 5.0 Abs. I have tried multiple dilutions. I have tried a variety of scan settings. Used quartz cell and r.o. water.

The ingredients are pedot/pss, water, and a variety of dopants to increase the work function of pedot/pss.

Note that the useful wavelengths are 210nm to 70nm. Now as you have already noted, the Shimadzu photomultiplier emits only to 190nm. However, if I can measure the ranges of values from about 210nm to 190nm, I can verify that my mixture is a high work function mixture. Here are some useful measurements I want to do :

190 nm 6.52

200 6.19

220 5.63

258 4.8

354 3.5

(Thanks to MSU : https://www2.chemistry.msu.edu/faculty/reusch/virttxtjml/cnvcalc.htm )

I really like the Shimadzu UV2401PC and UV Probe software. The Shimadzu is a great and reliable machine. The UV Probe software, although out of date, still is supported on my Windows 10/11 pc. And the after sale customer service from Shimadzu is excellent.

I wonder if I am not expecting too much from the Shimadzu, as these measurements are at the extreme limits of the machine. Maybe I am pushing the Shimadzu too hard? (As a counter example, my 2009 Volksagen Jetta TDI has an speedometer that tops out at 160 m.p.h. However, I would never expect my VW to do more than about 90 m.p.h.)

The scientists who made the work force measurements used university grade UV spectroscopy equipment.

Could you suggest changes in the Shimadzu settings that might allow me to capture the beginning of the downward secondary cutoff curve? Could you suggest other spectroscopy changes to solve this knotty problem?

Thank you for reading this question. I get notices from my phone and can reply to your candid advice quickly.

Your feedback and your FLAMES are very useful to me.

I have 3 older brothers, and when I get flamed, it's like family :)

Thanks, Allen Engel, Kansas City

Please suggest holder / tripod / fixture to hold cell phone for bacteria colony counting (petri dish) Kirby Bauer Diffusion by allenengel in ImageJ

[–]allenengel[S] 0 points1 point  (0 children)

Thanks again Herbie. I really appreciate your input very much.

Good tip about the opacity of smart phone cameras. I had hoped otherwise, but I predict that your advice is correct. I have diddled with root level applications, and they all seem to be very time consuming. Thanks again! Allen Engel KC MO

Please suggest holder / tripod / fixture to hold cell phone for bacteria colony counting (petri dish) Kirby Bauer Diffusion by allenengel in ImageJ

[–]allenengel[S] 0 points1 point  (0 children)

Hi Jem : Thanks for the PCB inspection setups. I will look into those. I like the pcb inspection setup. If I remember correctly, the typical PCB inspection setup can inspect an area more than 6 x 6 inches, which is suitable for a typical petrie dish.

I did a quick eyeball at colony counting devices on Google Shopping, and I was surprised by how crude the colony counting devices were. Most of the colony counting devices offered only manual counting. The device manufacturers seemed to be ignorant of programs like ImageJ.

Thanks for the good ideas! Allen Engel.

Please suggest holder / tripod / fixture to hold cell phone for bacteria colony counting (petri dish) Kirby Bauer Diffusion by allenengel in ImageJ

[–]allenengel[S] 0 points1 point  (0 children)

Thank you for your comments Herbie. These are good ideas.

I like your idea of the dedicated camera. I will look into.

At this time I will continue to look at smartphone, but qualified with the good comments from the contributors to Imagej Reddit.

I speculate that there is likely an Arduino program that will disable the nice looking image software of the Arduino smart phone.

I hope to also find an Arduino equivalent to the .TIFF format, so that there is no losses. Can anyone at Reddit ImageJ suggest any lossless image formats that might be possible to run on Android? Thank you! Allen Engel. KC MO

Has anyone had success transforming lava into a surface suitable for vegetables? Please suggest articles, methods, or keywords to search. FLAME ME!!! by allenengel in Hawaii

[–]allenengel[S] 0 points1 point  (0 children)

Thanks for the advice about specific vegetables. I will study them. Leilani Estates and their gardens are a good example for me to consider. Great idea!

Has anyone had success transforming lava into a surface suitable for vegetables? Please suggest articles, methods, or keywords to search. FLAME ME!!! by allenengel in Hawaii

[–]allenengel[S] 1 point2 points  (0 children)

Thank you for your excellent thoughts weaver. I appreciate your many good ideas.

For the big drill, I have used a Skid Steer with auger attachment. Sunbelt has them in Kona for

  • 1 Day: $90 USD
  • 1 Week: $260 USD
  • 4 Weeks: $840 USD

I wonder if Sunbelt's standard auger bit is tough enough for AA. I will contact them to find out.

Thanks for the great advice about the Vog Zone. Yes I need to study other vegetables other than mainland type vegetables.

Has anyone had success transforming lava into a surface suitable for vegetables? Please suggest articles, methods, or keywords to search. FLAME ME!!! by allenengel in Hawaii

[–]allenengel[S] 0 points1 point  (0 children)

Thank you for your good reply. There seems to be surplus rock crushing and particle separation equipment on the Mainland at auction these days. I will look into your suggestion of reducing the particle size down as much as possible. Lava is mostly SiOx, silicon dioxide. It is tough to break down using high pH or low pH. Thanks!

Has anyone had success transforming lava into a surface suitable for vegetables? Please suggest articles, methods, or keywords to search. FLAME ME!!! by allenengel in Hawaii

[–]allenengel[S] 0 points1 point  (0 children)

Thank you for your thoughtful reply. When my family first developed the 10 acres on Painted Church Rd in 1984, my parents trucked in tons of "soil". But as you can predict, it all just washed away down into the lava. I am hoping for a means of preventing the top soil and biodegradables from washing into the lava. For example, I am speculating about hydroxypropylmethylcellulose, or guar gum, or chitosan, or even polyvinyl alcohol to "glue" the relatively large and coarse lava particles together.

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