Is it possible for a gas absorption reaction be first diffusion-controlled at low loading, then turns kinetic-controlled?

20 September 2020 1 2K Report

It's about CO2 absorption with MEA in miniscule volume. And would a pseudo first order reaction assumption still be valid if there is no mixing and agitation?

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Colour of Methylammonium Iodide (MAI) in Isopropanol (IPA, 99.7%) turned slightly green after storing some time?

Has anyone observed the changes of colour of MAI in IPA to slightly green-ish after storing some time? I might have to prepare fresh solution again if this is abnormal. Could anyone verified the...

18 April 2020 7,504 1 View

How to connect Newport's Keithley SMU to perovskite solar cell to measure efficiency?

I have 4 crocodile clip wires, if I'm not mistaken 2 wires (red) connect to anode and the other 2 black wires connect to cathode. Both pairs of wires are plugged at the back of the SMU. Problem...

16 January 2020 3,000 2 View

Can I use Phillips Halogen Lamp (70W) to access the light stability of perovskite solar cell under ambient air condition?

We only have 1 Newport Xenon Lamp for PCE measurement. Is halogen lamp a suitable substitute for the Newport Lamp? We don't have the money to purchase another one solely for stability testing. If...

07 November 2019 5,294 6 View

Weighting Methylammonium Iodide in ambient air with 40-60% humidity for perovskite precursor preparation?

Hi, i would like to know will the humidity (40-60%) of the room be detrimental to the MAI powder when weighting on the analytical balance? is the moisture sensitivity reduced when MAI is quickly...

25 June 2019 5,689 4 View

Determining the amount of HAuCl4.3H2O sticking on glass vial inner surface?

Since HAuCl4.3H2O (gold precusor) is very expensive, it is best to utilized it as much as possible. I have a glass vial that contains such gold precursor. Some of it are spread onto the inner...

28 May 2019 9,890 3 View

How to oxidize titanium layer sputtered on FTO glass to anatase to act as blocking layer?

I have sputtered a layer of Ti on FTO and was hoping to perform anodization on the sample to obtain TiO2 nanotube. However, when semi-transparency is achieved, the TiO2 nanotube peeled along with...

16 March 2019 3,684 4 View

May I know what statistical test can be used to test the association between two categorical variables with 6x2 contingency table?

I want to test the association between the ethnicities of the respondents (6 groups) with study sites (2 study sites), to see whether the distribution of the ethnicities varies across the study...

17 December 2018 7,767 14 View

Can you re-use the Nalgene Disposable Filterware (115 mL)?

I ran out of 50-ml conical filter bottles. I have these 115 ml disposable filters, but I feel like it is such a waste throwing it away after a single use. It comes with a cover and, if kept in the...

18 November 2015 2,617 2 View

Can anyone suggest any new article related to cognitive-affective personality models and the variance of behavior under different situations?

May I know that any one of you are doing any research on this topic? or interested in this topics ? I only managed to download and have no more than two articles published by Professor Walter...

03 March 2014 8,418 2 View

What is the difference between soft crystal B phase and hexatic B phase?

Upon cooling from the smectic A phase at 55 degree celsius, a tiny transition bars is observed across the fan-shaped boundaries. Further mechanical disturbance is induced, but the fan-shaped...

12 February 2014 8,704 1 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 to check the uv-vis absorption of nanoparticle by surface plasmon resonance?

I try to check the uv-vis absorption of Indium nanoparticle. Now I am measuring in solution, can I measure it in the form of a film?

01 March 2021 930 3 View

Any research papers for extraction of nutrient deprivation on macroalgae? Analysed by HPLC-UV and GC/MS. Possibly from macroalgae genus Rhizoclonium?

I am doing my thesis on the nutrient deprivation on the macroalgae Rhizoclonium sp. I will be analysing the levels over a period of roughly 5 days by HPLC-UV and GC/MS. I will be using seawater as...

28 February 2021 6,477 1 View

Necessary tube lenght to cool Natural gas in a dry-ice cooling bath?

I have a tank which contains natural gas at 250 Bar and 293 Kelvin. I want to cool the gas in a dry-ice cooling bath to about 195 Kelvin. The gas will flow in a copper-tube through the bath with a...

27 February 2021 8,128 1 View

Exit velocity of natural gas from pressurized tank?

Hi Guys. I'm a mechanical engineer and have a bit trouble, would be very glad if you could help me with my questions. I have a pressurized tank which contains Natural Gas at 200 Bar and 293...

26 February 2021 6,253 3 View

Why initial concentration of Pb not the same as calculated one when testing using AAS?

I am currently doing research on the adsorption of heavy metal using magnetic reduce graphene oxide. I use AAS to determine the concentration of the heavy metal. I prepare the Pb solution with...

26 February 2021 9,580 4 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

Gas sensor response and recovery time independant of flow rate and chamber volume?

I am trying to obtain the response and recovery times for my gas sensor device. It appears the the response/recovery times are primarily dependant on the flow rate of the gas I inject into the...

26 February 2021 1,511 3 View

Why do a weight decrease for thermal degradation in nitrogen gas condition?

Hi all The question is related to TGA(Thermogravimetric analysis). Thermal degradation easily understood but why do samples weight decrease? altough just binding is broked, the weight of...

26 February 2021 1,100 5 View