Sridhar Sampath

26 Questions 58 Answers 0 Followers

Questions related from Sridhar Sampath

What is the effect of time duration in calcination of TiO2?

In some articles I can see calcination of TiO2 at 400 C for 5 hrs. What is the role of 5 hrs? What happens when we reduce or increase the time duration ?

03 March 2014 3,548 8 View

What is the best mode of AFM for imaging contact mode or non-contact mode?

Thanks in advance.

02 February 2014 4,662 13 View

What is the difference between Atomic Layer Deposition (ALD) and Chemical Vapor Deposition (CVD)?

Seeking to understand the difference.

02 February 2014 5,901 14 View

What is the need of using reciprocal lattice? Why should we not use direct lattice?

01 January 2014 7,705 27 View

How do I calculate the indirect band gap energy from Phonon spectrum?

Does it show the accurate indirect band gap energy of the material?

12 December 2013 8,629 5 View

What is the difference between direct and indirect band gap energies?

Seeking to understand the difference.

12 December 2013 7,112 70 View

What is difference between Phonon and surface Plasmon absorption?

I think both are based on electrons oscillations. Can someone help me to understand?

12 December 2013 3,048 4 View

Why does anatase TiO2 show indirect band gap energy and rutile TiO2 show direct band gap energy?

Seeking the scientific reason behind this.

12 December 2013 7,252 7 View

String theory tells us we live in ten dimensions. What is the actual difference between 3rd and 4th dimension?

Also, what are the maximum dimensions existing in this universe?

12 December 2013 3,660 2 View

Einstein theory goes wrong or not?

one can get time dilation on earth if he sees the event in the moving spacecraft (According to his earth frame, the spacecraft moves away from him). At the same time one can get time dilation in...

12 December 2013 2,024 1 View

Which one is the most reliable model for Phonons - Debye model or Einstein model?

I am looking for the most reliable model for Phonons.

12 December 2013 663 18 View

What is the exact definition of Wave function?

Also I would like to know the History of Wavefunction

12 December 2013 3,289 17 View

How does the composite differ from 1. coupling and 2. alloys?

I would like to know the difference.

11 November 2013 9,562 2 View

What is the difference between transparent coating and anti-reflecting coating?

Is there any difference between transparent coating and anti-reflecting coating?

11 November 2013 2,886 4 View

How does the charge transfer take place in TiO2 coupled by semiconductor (its CB and VB is below and above of TiO2) under visible light?

11 November 2013 4,692 6 View

Why does band gap energy of quantum dots vary with its size?

10 October 2013 4,184 20 View

Is it possible to calculate the Band gap energy of the material from photoluminescence (PL) spectrum?

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09 September 2013 6,883 6 View

What is the difference between free exciton and bound exciton in PL spectrum of TiO2 ?

Seeking to understand the difference

08 August 2013 7,918 7 View

What is a good way to measure the porosity of the coating?

07 July 2013 9,873 15 View

Is hydrogen gas also produced (I mean water splitting) during photocatalytic MB dye degradation?

07 July 2013 5,577 1 View

Why do noble metal nanoparticles show surface plasmon absorption but not transition metal nanoparticles?

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07 July 2013 5,008 13 View

Why is the band gap energy of Anatase phase larger than Rutile phase of TiO2?

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07 July 2013 1,520 8 View

What is the difference between anodization and micro arc oxidation?

06 June 2013 4,159 10 View

Why is some type of gas sensor always heated to a certain temperature?

I have prepared nanocrystalline TiO2 powder and I am looking for gas sensor applications.

06 June 2013 7,659 10 View

Is it correct to say anatase phase of TiO2 is more active than the other phases in photocatalysis?

I have prepared the mixrure of anatase and rutile tio2 (65:35). But I don't know whether anatase or rutile or the mixture is suitable for photocatalysis.

06 June 2013 2,853 17 View

Why do people adjust PH in sol-gel synthesis?

I prepared nonmetal doped tio2 without adjusting PH and the band gap energy of tio2 is also reduced.

06 June 2013 4,318 11 View