Soong Leong Sim

12 Questions 17 Answers 0 Followers

Questions related from Soong Leong Sim

Can I freeze a CoPi/ metal oxide in N2 before cutting it cross section for SEM?

Planning to do it this way, but cannot help worrying about possible changes that will happen to Co-Pi coating.

09 January 2018 5,588 2 View

why a commercial TiO2 cant get photocatalytic activity with it?

22 February 2017 1,190 3 View

Why does my commercial n-WO3 turned whitish green after cooling down from annealing at 450C for 2h, it is supposed to be yellow colour. Why?

It is for photocatalyst application. Synthesized WO3 is still yellow after annealing and cooled afterwards. But for the commercial WO3, it turned whitish green like a light cabbage colour and the...

17 October 2016 896 4 View

How can I sonicate aggregated nano-sized powders?

We bought nanosized cobalt oxide and Fe2O3 powders but has aggregrated, how can we return it to nanosize ? What solvent should we sonicate it in?

24 February 2016 1,074 3 View

I want to learn back front IPCE, what is the best article to start? Assume i dont know anything about IPCE?

Other than the front and back IPCE illumination,I also need to know about the generation of positive and negative photocurrent and the conductivity equation of electron in IPCE research.

24 February 2016 1,250 1 View

Is it fine to doctor blade over a bladed layer of film using the same paste?

Sometimes doctor bladed surface has a hole left unbladed or untouched which i dont understand why? If the above happened, can I reblade the same surface again? (Sorry i am not sure of terminology)

02 January 2016 9,465 4 View

How can we get all grinded sample from the mortar as most of the grinded sample were stuck there as scraping induces contamination?

Please help, thank you.

03 December 2015 2,292 7 View

How can I calculate the band gap using a plot of K.M from % R against wavelength?

Also how does one obtain absorption coefficient when only powdered sample was used? Without "a" , I cannot plot direct transition against wavelength to calculate band gap.

05 May 2015 5,118 2 View

I would like to know an article regarding relationship between ferroelectrics and photocatalysts?

And also articles that cover ferroelectrics basics and perovskite structures in photocatalytic research on PEC.

25 February 2015 3,968 4 View

Hi I do not understand the concept of band structure?

How is this related to band gap? I cannot connect these two because i do not understand band structure.

13 February 2015 6,994 4 View

Is there less studied part or gap in the field of Ferroelectric perovskite photocatalyst?

Perovskite structures and its applications have been studied a lot in the past and its application in photocatalyst is new. I am really interested to know the novelty or less explored part of this...

05 February 2015 1,777 2 View

How do we calculate sintering temperature ? Is there a review paper on this?

Is there a specific way to calculate temperature?

24 January 2015 2,082 16 View