Alaa El Din Mahmoud

16 Questions 65 Answers 0 Followers

Questions related from Alaa El Din Mahmoud

How can ethanol (very small concentration) be separated from water?

# Food industry. Food industrial water contains small concentration of ethanol related to the water content. Is there a technique or procedure to separate or extract ethanol without using membrane...

04 April 2019 8,274 16 View

Preparation of Humic acid stock solution?

Dear All researchers, How much grams of Humic acid (crystallite powder) is required to prepared 2 mg/L in DI? Best regards Alaa El Din

05 May 2018 1,248 0 View

Which book do you recommend??

There are different books related to publish in high ranking journals, avoid plagiarism and how to paraphrase the cited sentences. Therefore, I need your help to suggest a name! Best regards Alaa...

05 May 2017 5,268 8 View

Can you explain the following graph obtained from UV spectra Lambda 35?? X axis is Wavelength nm and Y axis is absorbance.

It is supposed that we got graphene. However, we have two peaks inverted in near 300 and 200 nm.

08 August 2016 7,189 10 View

Is there any method or way that can be alternative to freeze drying of organic samples (powders)?

Please, I need any suggestions

08 August 2016 7,000 3 View

How can the theoretical C/O ratio be calculated?

As you know, we can get this value from XPS AND it will be the practical value. However, the calculation of the theoretical one can be done by which equations!!

07 July 2016 6,247 8 View

Why get I always fluctuations in the range 300-400 nm in UV spectra as shown below?

I tried with plastic and glass cuvette and I have the same fluctuations. The sample is plant extract + DW. Regards

06 June 2016 2,430 6 View

Which type of Graphene Oxide should be purchased to prepare graphene?

There are a lot of different GO types in Sigma-Aldrich. Which criteria should one take into account?

05 May 2016 356 4 View

What is the scientific basis behind''The first-order scattering of the E^2g phonon from sp^2 carbon"?

In Raman Spectra of Carbon materials. We have always D, G and 2D bands. What are the meaning and the scientifc theory to interpret the Raman Spectra?

04 April 2016 7,587 0 View

Can you help to know the oxidation methods for Graphite to get Graphene Oxide?

I need to get overview and the practical protocols for the available oxidation methods to get Graphene Oxide from Graphite.

04 April 2016 4,480 7 View

What is the meaning and the practical steps for Increasing ionic strength of a nanoparticle solution?

Increasing ionic strength of a nanoparticle solution that leads to a reduction of the zeta potential.

01 January 2016 3,928 3 View

Is there any simple softwares to draw images as below?

How to design or draw 3D images with simple methodology??? any suggested softwares and the procedure

09 September 2015 9,472 6 View

Protoﬁt software has the ability to calculate pKa values.

How can I use the software and define each item?

08 August 2015 2,857 1 View

How can I calculate 0.1 mM Silver Nitrate AgNO3?

Please, I need simple methodology to calculate such amount of silver nitrate to know its weight.

08 August 2015 5,700 3 View

If I have a map for a certain urban location, how can I determine the soil sampling points in this zone?

I need to take plant and surficial soil samples from industrial area around a certain factory. (Map is from google earth)

04 April 2015 4,133 15 View

How can I get MSE value from neural network in Matlab 2009?

Neural network

01 January 2015 2,690 1 View