Soong Leong Sim

24 Questions 20 Answers 0 Followers

Questions related from Soong Leong Sim

What does this phrase means, "0.5M in sulfuric group of poly(4-styrenesulfonic acid) (PSS)"?

I dont understand how to prepare the solution because i dont understand what does it mean, and i dont know the conc. of the PSS stock solution.

01 January 2019 2,279 1 View

Is there a free pogram to analyze the .pro file with profiling also from alpha step 500 as the main software is not free?

trying to analyze data at home while not in the lab

06 June 2018 8,368 0 View

What is an optimum parameter to C coat MO on glass substrate for SEM?

Using JEC 560 auto carbon coater 3KPa , and 30 s I think its a bit too long.

05 May 2018 9,644 2 View

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.

01 January 2018 5,203 2 View

Need advice to cut cross section of porous film on FTO for SEM. Sample came off when cut with glass cutter, no sample seen at edge of cut FTO. Help?

Cross section cut of porous sample /FTO scratch off sample from the edge of the FTO making it hard to check in SEM. Need help to cut it so the film stays on the edge of the cut.

01 January 2018 9,726 0 View

Do I mix the binder into ultra-sonicated powder immediately or wait for 2-3 hours to settle then mix supernatant with binder, and then stir it ?

Plan to make a paste but confused if we should wait for the sonicated powder to settle first and add binder to only the supernatant, or do we just add binder to the ultrasonicated powder...

08 August 2017 8,846 0 View

What paper have these ingredients: tungsten isopropoxide , acetic acid, ethanol and distilled water to synthesis WO3?

looking for a research paper synthesizing WO3 with the above ingredients.

06 June 2017 1,580 0 View

Can i add dispersant after precipitating metal oxide from addition of alkali and acid to metal oxide NP (chemical deagglomeration)?

I added ammonium hydroxide and HCl to commercial WO3 NP in order to reprecipitating WO3 NP (chemical deagglomeration) but unsuccessful. The process results in large particles settles at the...

01 January 2017 6,028 6 View

How to find concentration of solution based on solid content. The solution is made of synthesized powder suspended in liquid?

some mass is loss in grinding before dispersion. solution is very dilute.

01 January 2017 7,416 2 View

Can 1- nonanol, acetyl acetone and triton X-100 be put in the same medium?

its for thin film paste making.

01 January 2017 7,912 5 View

What references can i look to calculate faradaic efficiency of electron transfer in PEC semiconductor for water splitting?

Faradaic process is the electron transfer across an interface in redox reaction, but i dont know how to determine how efficient this process is.

12 December 2016 2,783 3 View

What does semi infinite diffusion layer means ?

often mentioned in EIS and electrochemistry.

12 December 2016 7,977 0 View

Hi can i have a reference to the first paper on Co-Pi catalyst?

I also dont understand why they named a cobalt- phosphate catalyst as a Co-Pi catalyst.....

09 September 2016 1,176 3 View

"What does 45g of EC and 35g of EC of these 10 wt% ethanolic solutions" means?

http://www.sciencedirect.com/science/article/pii/S0040609007009157 at section 2.2.2 I dont quite understand the meaning of the paragraph about adding the ethyl cellulose and wt% of ethanol needed.

07 July 2016 2,677 1 View

What does first-order and second order recombination of electrons really means?

First order reaction , first order model, what do all these mean?

03 March 2016 3,641 0 View

What should i do when i am stuck with a paper that i dont understand but related with my research?

I dont know how to properly approach the problem of not knowing where to start when I meet a problem or concept i dont understand completely when reading a research article. Also, is it a good...

02 February 2016 392 2 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?

02 February 2016 5,005 3 View

Why does my TiO2 film always have bubbles in it after calcining even after i kept everything clean during the preparation process?

There are bubbles in TiO2 film which is very annoying,

01 January 2016 1,230 2 View

What is non linear recombination model in films or semiconductor, what does it physically and mathematically mean?

I dont quite get this non-linear recombination , first and second order recombination in photocatalyst studies.

01 January 2016 3,711 0 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.

12 December 2015 10,030 8 View

What mathematical transformation was used on Poisson distribution to derive debye length on semiconductors?

How is this transformation then used to calculate charge excess delta N at band bending with sc of the semiconductor? Ref: Semiconductor Electrochemistry Wiley-VCH, 2001-Rüdiger Memming P.88-91

11 November 2015 3,208 3 View

Can anyone provide zeta potential and electrodes related articles?

I do not quite get the relation of measuring zeta potential in anode. Thanks in advance

06 June 2015 2,008 0 View

Please explain bloch theorem's relation to pronig kenney model to band structure then band gap?

Please help. Thank You

05 May 2015 5,492 0 View

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

Is there a specific way to calculate temperature?

01 January 2015 3,248 16 View