What does the strange peak at 17.99 degree in XRD of TiO2 (P25) represent?

I stirred the TiO2 (P25) powder with the NiCl2.6H2O solution for 1day. After that, I separated the mixture and dried the powder. Then, I performed XRD for TiO2 powder, and I got a peak at 17.99...

06 July 2018 6,169 0 View

How can I calculate the molecular weight of polymers from the viscosity?

09 October 2016 9,092 10 View

What is the best definition for the particle size measured by zetasizer?

Also, I would like to know if there was a difference between the size of particles measured by zeta and TEM.

05 June 2016 8,030 2 View

How do I dissolve polystyrene?

what are the best solvents for polystyrene (MW = 350,000) and what is the operating temperature of solubility?

01 February 2015 7,869 38 View

What are the best solvents for Polyaniline (emeraldine salt)?

Hi, I prepared polyaniline (PANI) by oxidative polymerization method, and I want to know the best solvents for PANI. And also, I want to know the best polymer which can be used to make PANI...

10 November 2014 3,085 82 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

No title

I am trying to find how to know the density needed for a pva electrospinning in a 0.6mm neddle, the electrospinning will be from top to bottom and the problem I really have is the solution because...

25 February 2021 2,615 3 View

Onset of Photo Oxidation in Polymers?

Hi! I am looking for some specific information in regards to the minimum amount of UV intensity required to begin the photo degradation process in polymers. I understand each polymer is...

15 February 2021 7,703 4 View

How can I calculate teh crystallinity degree of graphene oxide?

I had treat my XRD diffraction pattern by Highscore to calculate the crystallinity degree Xc and I have the formula but I dont no the 2Theta of Ac and Aa to calculate Xc. Is it like polymers...

10 February 2021 6,305 5 View

Could any one help me with mechanical properties of CFRP(carbon fiber reinforced polymers)?

I am modeling CFRP laminated a concrete column in Abaqus And I need Elastic and plastic properties of CFRP

09 February 2021 4,930 5 View

Dear colleagues. How can we implement the kinetics of the polymerization of aromatic amines in easier and simpler ways?

Dear colleagues. How can we implement the kinetics of the polymerization of aromatic amines in easier and simpler ways? Are there simpler methods for Nano polymers (other than those obtained with...

09 February 2021 5,783 3 View

How to calculate enthalpy of formation of Polymers taking into account the terminal end groups?

I am trying to find methods for theoretical calculation of enthalpy of formation of Polymers. till now I have found the oligomeric method (Gaussian) which uses the extrapolation of results from...

05 February 2021 9,707 4 View

What are advantages of NELF model?

I am trying to simulate permeation of gases in polymers. For this reson normally i use the clasic models like dual sorption model but newly i foun dthe non equilibrium lattice fluid model. It...

03 February 2021 1,203 3 View

Is it possible to find out the wettability and contact angle of water on the rough or corrugated substrate?

First of all, whether it is possible to identify the presence of water and its amount on the Silicon substrate by using only FT-IR spectroscopy. Can ATR-FTIR spectroscopy find out the wettability...

03 February 2021 9,085 4 View