How can one make stable oil based ferrofluid from hydrothermally synthesized MnZn Ferrites ??

Hello, I want to make stable oil based ferrofluid from MnZn ferrite nanoparticles prepared via hydrothermal synthesis. I tried to coat it using NH4OH+Oleic acid and then added acid so as to remove...

07 August 2017 4,781 1 View

When some electrical power is driven through a wire which is wrapped around a metal tube, how to know the temp. rise of the tube theoretically??

01 February 2017 9,906 3 View

What are the experimental techniques to confirm the coating of nanoparticles?? And which one is the best to describe the situation??

I have coated a ferrite nanoparticle with an organic acid. But I want to know whether the coatings have been formed around the particles or not. What are the techniques generally used and which...

31 December 2016 8,841 10 View

What are the steps to get a smooth XRD pattern of nano sized powder samples??

How can I get a smooth XRD pattern of nano sized powder. I am using BRUKER D8 advance with a step size of 0.002 and with rotation of 15RPM with 2theta ranging between 10 deg and 90 deg. But what I...

01 January 1970 3,607 4 View

How to prepare a stable MnZn Ferrite ferrofluid using chemical methods??

I want to prepare MnZn ferrite ferrofluid. But the problem I am facing is the surface modification to avoid agglomeration of the particles. I am following the hydrothermal synthesis method for the...

01 January 1970 9,327 1 View

In COMSOL, how one can decide for the proper meshing size?

For complex research related real life problems, how can I decide that which meshing will be perfect for the problem and can rely on the final results of that for publication purpose??

01 January 1970 5,151 4 View

How to activate the surface of the nanoparticles??

I am preparing alloy nanoparticles by ball milling. But, the alloy nanoparticles have neutral surface. How can I make the surface positive or negative charged so that I can add some anionic or...

01 January 1970 4,703 5 View

How to figure out the default parameters that we can get from different modules in COMSOL and call that later for defining another function?

Hi all, I need to know the way to figure out the available by default output values from different modules which can be used in COMSOL. To make my statement clear, I am using the magnetic field no...

01 January 1970 5,091 7 View

How to implement if else condition in COMSOL??

I am simulating for the subsequent application and removal of magnetic field to magnetic materials to check for the increase and decrease of magnetization. I want to repeat the above steps with...

01 January 1970 1,538 2 View

How we can draw a graph between observed critical parameter versus mesh size in COMSOL? Also, how can we plot relative error versus mesh size?

To know the efficiency of the mesh size, how can we plot the error vs no. of elements/mesh size in COMSOL

01 January 1970 9,448 0 View

MD MOE RMSD

How to calculate the RMSD values for a MD simulation using MOE?

07 August 2021 0 0 View

MD MOE RMSD

How to calculate the RMSD values for a MD simulation using MOE?

07 August 2021 0 0 View

fatal error

When I tried to energy minimization my system, I got fatal error as below. Fatal error: Atomtype opls_116 not found Although I've already added this line: ; include water #include "oplsaa.ff/spc.itp" to [molecultype] directive in my topology.

16 June 2021 0 0 View

fatal error

When I tried to energy minimization my system, I got fatal error as below. Fatal error: Atomtype opls_116 not found Although I've already added this line: ; include water #include "oplsaa.ff/spc.itp" to [molecultype] directive in my topology.

16 June 2021 0 0 View

fatal error

When I tried to energy minimization my system, I got fatal error as below. Fatal error: Atomtype opls_116 not found Although I've already added this line: ; include water #include "oplsaa.ff/spc.itp" to [molecultype] directive in my topology.

16 June 2021 0 0 View

fatal error

When I tried to energy minimization my system, I got fatal error as below. Fatal error: Atomtype opls_116 not found Although I've already added this line: ; include water #include "oplsaa.ff/spc.itp" to [molecultype] directive in my topology.

16 June 2021 0 0 View

Resistor definition in Piezoelectric bimorph with ANSYS workbench

Hello, good day! I am trying to simulate similar bimorph piezoelectric harvester with below commands. However, the output power doesn't change with resistor value. Please help to find the reason. ET,10,CIRCU94,0 !SET UP RESISTOR R,1,100000 !RESISTANCE VALUE TYPE,10 !SET ELEMENT TYPE E,1,2 !CREATE RESISTOR BETWEEN NODES 1 AND 2 Thanks in advance Regards,

02 March 2021 0 0 View

Is there any tutorial for comsol general projections?

Hi, im trying to make a projection in a 3d comsol model. I have a non uniforme chanel and my intention is to get the average tempreture in the y-z cross section and se the average tempreture...

02 March 2021 4,624 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

Is it possible to do piezoelectric coupling in ANSYS-APDL or COMSOL between tapered substrate and rectangular piezoelectric patch?

How to do Piezoelectric coupling in ANSYS-APDL or COMSOL between tapered substrate and rectangular piezoelectric patch? Piezoelectric coupling between the rectangular substrate and rectangular...

02 March 2021 9,833 3 View