Which thermodynamic parameters are more important to a chemical engineer or a chemist ?

03 April 2017 2,769 0 View

What does decrease in Id/Ig value in raman spectroscopy indicate for carbon based compounds ?

Hello, I have prepared carbon coated metal nanoparticles. In raman specta I found intensity ration of D and G band (Id/Ig) ratio to decrease from 0.91 to 0.95 with increase in heat treatment...

01 February 2017 5,908 6 View

Why the lattice constant decreasing with increasing annealing temperature for silver nanoparticles in range of 20-30 nm ?

Hello, I have synthesized silver nanoparticles using PVA as encapsulating and stabilizing agent. From XRD i could get 25 and 28 nm crystallite size for 400 C and 500 C annealed samples. The...

01 February 2017 7,432 3 View

Is it possible to get red shift in CeO2 absorption peak with increase in 3+ ion dopant concentration ?

Hello, I have obtained Gd doped CeO2 nanoparticles. With UV spectra I could find increase in direct band gap values from 3.6 eV to 3.8 eV. Howerver, I was expecting band gap to decrease with...

09 October 2016 9,960 4 View

What is the reason for getting reverse change in lattice parameter for gadolinium doped CeO2 heat treated at different temperature ?

Hello, I have prepared 3%, 5%, 10% gadolinium doped CeO2 (GDC) and have heat treated it at 400 C, 500 C, and 1200 C. See attached figure for peak shift. I have calculated lattice parameter for all...

09 October 2016 9,860 7 View

What does the peak at 919 eV in Ce3d xps spectra indicate ?

Hello everyone, Please look at the attached figure corresponding to Ce3d of gadolinium doped CeO2. I got two peaks positioned at 919.4 eV and 916.1 eV. However, for Ce4+ we get only one peak...

09 October 2016 1,813 7 View

Where shall I observe Photoluminescence (PL) peak ?

Hello, If I get UV-vis absorption peat at 340 nm for a semiconductor and if I excite the material with 290 nm wavelength, where shall I expect the PL peak in emission spectrum assuming no other...

08 September 2016 8,451 8 View

Sensitivity factor for Ce 3+ and Ce4+ ?

Hello I want to calculate the amount of Ce3+, Ce4+ and Oxygen concentration in CeO2 sample. I have peak area (after deconvolution) of all. However, I do not know the sensitivity factor which is...

08 September 2016 9,437 8 View

How do i find X,Y,Z position of atoms for La0.6Sr0.4Fe0.8Co0.2O3 ?

Hello, I want to obtain X, Y, Z position of atoms for La0.6Sr0.4Fe0.8Co0.2O3 rhombohedral structure. How can I obtain it ? Can anyone help me for it ? I have data for XRD.

03 April 2016 1,333 4 View

How to make proper surface contact on aluminum metal foam surface for heat exchanger applications ?

Hello, I have rectangular open cell Aluminum metal foam. I want to study its application as an heat exchanger. However, I am unable to make the parallel plate connections on its surface...

02 March 2016 3,515 2 View

What are anisotropic electrical and optical properties of a semiconductor due to?

In some materials, properties such as band gap, thermal conductivity differ along different crystallographic axes. What are the basics?

01 March 2021 1,923 3 View

Energy minimization in LAMMPS using NVT ?

How do I do energy minimization in lammps with NVT ensemble ? I am using the following command and it does not seem to work. It stops at extremely high energy and gives me the error zero search...

01 March 2021 2,294 3 View

Why is the sum of the elements in a row in a Q matrix equal to zero?

When explaining substitution models, the substitutions are expressed as Q matrix. Why is the sum of the elements in a row zero?

28 February 2021 3,864 3 View

How the Ground Plane implantation is performed without damaging (and w/o varying the undoped nature) the top Si (8-10 nm) in FDSOI technology ?

It is a general practice to introduce Ground Plane in FDSOI devices under the BoX. The Ground Planes are introduced by Ion Implantation through Top Si layer and Buried Oxide. I wanted to know that...

24 February 2021 5,974 4 View

Why the CHi^2 is close to zero with a bad fitting but the Rp and Rwp are still high?

I am refining my XRD data using in FullProf program. The intensity of the modulated X-ray peaks is almost flat. I tried to adjust the peak intensities but unsuccessful. What is the reason? I guess...

23 February 2021 2,304 4 View

Can a semi-conductor material have different absorption coefficient?

Does the absorption coefficient of the semiconductor changes with the change in the structure of the semiconductor? If you have a thin film and nanowire of the same semiconductor, will the...

23 February 2021 9,799 4 View

Can we use a compensation matrix with single staining that the negative population for each single staining is below zero?

Recently we used single staining to make a compensation matrix. But, for each single staining we saw that 13 to 25 percent of our negative population had been shown below Zero. In this situation...

21 February 2021 9,982 2 View

How to compare means of continuous data with zero-inflation and skew?

I have two groups (unpaired) of plant biomass measurements and want to know whether there is a test that can be used to determine statistical significance where assumptions are not violated. The...

18 February 2021 1,258 4 View

How can we determine the band gap of a composite material that is made up of a composition of direct and indirect band gap semiconductor materials?

I have a direct band gap material and an indirect band gap material. If I made a composite of both through physical mixing. Then how can I determine the band gap of such a material as the Tauc...

17 February 2021 8,104 4 View

What are your alternative data collection methods during the pandemic? What are the pros and cons?

Dear colleagues We are exploring possible data collection methods for environment and behavior research in the context of architectural environments. Have you conducted any Post Occupancy...

16 February 2021 2,575 4 View