Why paraffin based PCM changes color upon prolonged heating?

What is the reason for changing color of the paraffin based PCM upon prolonged heating at around 142 Deg C.

09 October 2019 8,675 5 View

How to segregate nano particles in powder form?

We have prepared silicon powder, which contains 30 nano to 9 micron range. We checked around 35% of particles are less than 1 micron. We want to separate these 35% particles from the rest. Any of...

08 September 2018 7,576 4 View

How to give Superhydrophobic finish on polyester during HTHP dyeing?

I like to know, how can we give super-hydrophobic finishing during HTHP dyeing of polyester fabric. I've heard that such finish give a permanent super-hydrophobic finish on polyester fabric. If...

07 August 2018 3,938 1 View

What is the most efficient way to prepare PU solution using alcohol?

I want to make dehydrated PU solution for coating nano-silicon, which reacted with water. Is it possible to get alcohol based PU solution? Any paper or suggestion will be appreciated....

10 November 2016 1,460 2 View

Is it possible to deposite silicon on cotton fabric?

06 July 2016 8,622 3 View

Is there any formula to determine maximum strength of a yarn?

10 November 2015 895 7 View

I'm interested for Copper-silver alloy. Is it possible to develop such alloy?

Is it possible to develop copper-silver alloy? Is there any work on this? I want to know alloy only for copper and silver, no other metals..If any of you has done research on this, pl. let me know...

03 April 2015 7,276 3 View

Is there any permanent fire retardant finish for cotton that will NOT affect the absorption property?

We are searching for some fire-retardant chemicals, which gives permanent fire retardant property, but will NOT affect the natural hydrophilic property and permeability of cotton fabric. Could...

31 December 2014 8,690 4 View

Can we classify HV and LV lines based on line length?

I have dataset which shows the length of power lines. I need to classify the lines based on the line length. Is there a rule to classify the High voltage (HV) and low voltage (LV) lines based on...

03 March 2021 4,116 4 View

Polymer composites suddenly solidifies?

I am making polymer composite by solvent mixing method. When I am trying to add filler solution in polymer solution it quickly get solidified. How to make them then uinform? It doesn't give time...

03 March 2021 7,540 4 View

How the parameters (such as Mw, Chemical bonds, polymer bland and so on) affect the mechanic property of polymer (such as storage, loss modulus) ?

Anyone can recommend any books on such topics? Thanks in advance.

02 March 2021 8,457 2 View

How do I determine the degree of polymerization of PEG 400 based on NMR integration?

Hello, I am working on the photocatalytic degradation of PEG 400. I would like to know if it's possible to determine the degree on polymerization based on NMR integration, or by the MW of the...

02 March 2021 6,186 3 View

How to polymerize TEOS?

I want to polymerize TEOS on a surface. I know that NH4OH is a preferred catalyst and an alcoholic solvent should be used .But I can not find certain amounts of each material to use. Does any one...

02 March 2021 1,404 6 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

Can polymer concentrations be calculated based on the number average molecular weight?

Hello, I spin-cast two different polymers onto wafers and measure their height as a function of initial concentration. For polymer A, I have the weight-average molecular weight (Mw) as well as...

28 February 2021 7,882 2 View

What is the density for pva electrospining?

I'm Juan Carlos, a high school student who is working with electropinning, I made an electropinning machine with a 21g needle and a 30kv high voltage source and the distance between my needle is...

28 February 2021 298 3 View

POlymer+DMSO solution and moisture??

What could be the reason of moisture at the sides of Vial when I am preparing my polmyer+DMSO solution for membrane fabrication? What etiquettes I am possibly missing here?

28 February 2021 6,516 5 View

Can impedance of antenna be less than 50 ohms?

I am simulating helix antenna in hfss, right now, giving excitation with 50 ohms port. When I see the results of Z parameter (real). It shows lower than 50 ohms. Do not understand, if it can be...

27 February 2021 4,218 7 View