Matthew Odonohue

5 Questions 1 Answers 0 Followers

Questions related from Matthew Odonohue

When a chemical product says 10-15% basis, is that in w/v, w/w, etc? Why dont they specify?

I am specifically referring to a product sold by sigma where they do not specify this information. The 10-15% was determined via Na2S2O3 titration, which makes me suspect that it is in w/w, but...

15 August 2023 7,285 1 View

Can I use sodium bicarbonate that is 5 years old?

I work in a single-molecule analysis lab. I have been waiting on a supplier to send sodium bicarbonate for a while, and I want to begin experiments now. We have a stock of sodium bicarbonate from...

10 August 2023 8,267 5 View

Titanium Citrate Synthesis protocol: grams and mmol?

The protocol specifies to add sodium citrate to TiCl3 (0.5g, 3.24mmol). But this has confused me. How much TiCl3 do I use? I have a stock solution that is 15% TiCl3 (Sigma, product number 1401)....

19 June 2023 2,566 3 View

How can I etch a thin oxide layer that forms on a thin (~50nm) SiN free-standing membrane, without damaging the SiN?

I am a nanopore researcher and would like to etch away the thin oxide layer that may form on SiN under ambient conditions over time. I am aware that I can use piranha solution. however, how much...

08 December 2022 798 2 View

How do backsputtered ions contribute to redeposition effects when using an Ga+ FIB?

The excellent book on the Introduction to FIB by Gianuzzi et. al. states the following: "FIBs are most often used to create features of high aspect ratio (i.e., deep narrow trenches). Sputtered...

05 December 2022 3,119 2 View