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

What is the proper format of using heaviside function in COMSOL ?

I want to define heaviside function in comsol. How can I do that?

01 January 1970 5,020 2 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

What is the most Operating System (OS) which can be INSTALL on Tiny hard devices like Raspberry Pi (RPi) hardware ?

I'm targeting to deploy a mesh network and manually configure MANET routing protocols. I'm preparing scenarios, architectures, and hard devices needed to do that. Are there some step-by-step...

03 March 2021 1,931 5 View

What is your perception on using visual analysis or quantitative approaches to evaluate data from single-case research designs (n of 1 trials)?

Results of single-case research designs (i.e., n-of-1 trials) are often evaluated by visually inspecting the time-series graph and computing quantitative indices. A question our research team is...

03 March 2021 687 1 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

Is There Any Feasible Method To Test Fluorescent Compounds Other Than Fluorescence Spectrometers ??

Is There Any Feasible Method To Test The Efficiency Of Fluorescent Compounds Other Than UV Spectrometers ? Suggestions Would Be Appreciated !

02 March 2021 5,785 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

How to address this issue in the analysis of Real-Time PCR results?

To dear Researchers, I was analyzing a series of concentration for estimation of Real-Time PCR efficiency. The concentration was 1:10. I used MS-excel to evaluate Slope. The result of slope was -8...

01 March 2021 8,683 4 View

How can i resolve the "final solutuin is not converged" error in Comsol for my heat transfer simulation??

I have been trying to simulate heat transfer problem in Comsol 5.5 for long time but it always throw an error stating: "Failed to find a solution. Maximum number of Newton iterations...

28 February 2021 8,626 3 View

High aspect ratio hexahedral mesh optimization solver?

I am interested in evaluating mesh optimization solvers that converge to high aspect ratio unstructured hexahedral grids. In other words, I am interested in a solver that optimizes warpage,...

26 February 2021 7,279 2 View

How to use measure capacitance change in COMSOL time dependent study ?

I want to measure change of capacitance due to relative displacement between two parallel plates in COMSOL. Distance between two plates changes with time. So I'm using a time dependent study but...

26 February 2021 8,567 3 View

How to approach CFD simulation results of a flow past a cylinder?

Hi all, I'm doing a transient simulation of flow past a rectangular cylinder close to the free surface. As far as I'm concerned, the common practice is to discard the initial stages of the...

25 February 2021 1,348 3 View