How to make disc from biochar / activated carbon flakes?

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Why does pH of DI water read alkaline?

I am trying to get pH of DI suspension, but prior to the suspension I am measuring the pH of DI water for comparison. My measurement is with SPER scientific benchtop pH meter. Before my...

05 June 2019 5,339 2 View

How to measure absorption spectra of activated carbon?

I have an activated carbon sample for which I want to measure absorption and transmission, reflection spectra from UV-VIs-NIR spectrometer in the solar spectrum. The equipment has cuvettes for...

31 December 2018 9,962 11 View

What is the best way to calculate cost of crushing a particle?

Given a chunk of particle size Di, how can I estimate the crushing work to reduce the size of the particle (to new size Do) and how can I calculate the cost involved in crushing the particle. I am...

10 November 2018 2,105 1 View

I am looking for a simultaneous heat and mass transfer model with finite differences?

I am trying to come up with a code for simultaneous heat and mass transfer for water evaporation owing to solar flux. The incoming heat flux contributes to volumetric heat generation within a...

09 October 2018 4,839 1 View

How to calculate reflected wavelength of incident solar radiation?

Greetings. The incident solar spectrum usually has the highest irradiation in the visible range. However I am interested in using particles, which show high absorptivity in the IR range...

07 August 2018 2,724 5 View

COMSOL, Phase change : How to couple heat transfer and fluid flow?

Hello, I am trying to solve a phase change problem. With the specified heat conditions (a heat flux and convection), the phase change material melts, and convection also starts to take effect. I...

02 March 2018 8,688 3 View

what is the simplest definition of ion exchange capacity

What this unit identifies for the ion exchange capacity ca. 0.92 meq. g-1. I am a newcomer in the membrane area. I just started. I highly appreciate your help

08 May 2021 0 0 View

what is the simplest definition of ion exchange capacity

What this unit identifies for the ion exchange capacity ca. 0.92 meq. g-1. I am a newcomer in the membrane area. I just started. I highly appreciate your help

08 May 2021 0 0 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

Why almost every element would be metallized in sufficiently high pressure and low temperature?

(This statement is from wikipedia, BTW). What is so special about metallic bond that is limiting high-P low-T state of a matter (as long as individual atoms exist, not white dwarf of neutron star...

02 March 2021 3,309 2 View

How Relativistic effects is one reason for lanthanide contraction?

The Lanthanide contraction which is the decrease in ionic radii of the elements in the lanthanide series from atomic number 57, lanthanum, to 71, lutetium, is due to poor shielding of the 4f...

01 March 2021 2,272 4 View

Ester cleavage conditions?

Hi all, I need to cleave the ester in Ethyl 2-amino-1H-imidazole-5-carboxylate to make the carboxylic acid and retrieve the product from solution to use in downstream applications of linking to...

01 March 2021 8,766 3 View

How to quantify carbon deposition on CuZnAl catalyst?

Dear All, I want to quantify carbon deposition on the surface of the CuZnAl catalyst. I have tried thermogravimetric analysis, but I've got weight gain as the active Cu- get oxidised. Does anyone...

01 March 2021 1,907 3 View

Why Trivalent chromium start precipitating above PH 5 ? Moreover discuss difference between adsorption of chromium and precipitation of chromium ?

I am a student of MS Environmental Engineering and started my research phase. I am working on metal removal ( chromium iii ) by using activated carbon prepared from the agricultural feedstock. So...

01 March 2021 5,475 2 View

How can I assign a velocity along one direction to CO2 molecules in a molecular dynamics simulation using GROMACS?

Dear all, I am trying to perform a MD simulation about the interaction between CO2 and a polymer. I create my model, solvate it and perform the NVT and NPT equilibration. Now I am not able to...

26 February 2021 10,014 3 View

CGA 300 Regulator for CO2 cylinder?

Has anyone ever tried to deliver CO2 with a CGA 300 regulator? I know that a CGA 320 regulator is standard for CO2. The issue is that I currently do not have any free CGA 320 regulators. I also...

25 February 2021 3,292 3 View