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 FC-ZFC curve indicates ?

Hello, Please look at the below curve and explain what does the hump in FC-ZFC curve indicates. What if there is no hump in it. Regards,

09 October 2016 7,556 3 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

flexibility of polymers chain

effect of double bond on the flexibility of polymers

07 April 2021 0 0 View

Formulation of polymer color flakes

I am writing to request some information for making polymer color flakes. I would appreciate the help.

17 March 2021 0 0 View

Physics: Why do we describe light by referring to its wavelength, but microwaves and radar pulses by referring to their frequency?

In physics, the description of the properties of light generally refers to its wavelength (nm), while in the range of microwaves and radio waves we refer to the frequency of a signal (e.g. kHz or...

03 March 2021 1,682 3 View

What is the production process of CaFe ferroalloys?

I looking for ferro calcium production process

03 March 2021 1,755 4 View

Why are the velocities so high in my Boussinesq approximation Fluent simulation?

Hello, I have a mechanism where air rises due to convective flows. In this simulation, nothing is driving the air except this. I understand that the Boussinesq approximation only works for small...

02 March 2021 4,910 3 View

12% ledeburitic cold work tool steel, etched for revealing retained austenite, any help for clarifying?

Hello everyone. Given microstructure image belongs to a 12% ledeburitic cold work tool steel (annealed and tempered). The sample was etched with picral (100 mL ethanol and 4 g picric acid). I...

02 March 2021 4,119 3 View

Why almost every element would be metallized in sufficiently high pressure and low temperature?

(This statement is from wikipedia, BTW). What is so special about metallic bond that is limiting high-P low-T state of a matter (as long as individual atoms exist, not white dwarf of neutron star...

02 March 2021 3,309 2 View

How to define and get results (stresses) for certain points of a model in abaqus, using python? When the size of the model changes?

I want to do a parameter study of a aixsymmetric cylinder in Abaqus. I want to create several jobs where I get the stresses for 3 different points in my model. These points are defined. I wrote a...

01 March 2021 10,078 1 View

LOAD DISPLACEMENT CURVES Stiffness increasing in ANSYS non linear analysis. HOW CAN I CORRECT IT?

Hi. I am doing non linear FE analysis using a new material beam under flexural 2 point loading using ANSYS. I have defined a bilinear material model. The solution has converged. In results I am...

01 March 2021 9,911 3 View

How Can I bring as much common elements in steel as possible to calculate stable phase(s) in OpenCalphad?

As I was tweaking step-by-step OpenCalphad6 Macros step1.ocm involving phase and thermal property calculation of a High-speed steel, I could not incorporate more than 6 elements in the steel...

01 March 2021 8,840 1 View