Change in the surface area after modification?

Hello, dear Scientists I would like to know why in some cases, if you impregnate metal in a support (in different percentages, e.g.: 1%, 2%, 4%) the surface area of the final material do not...

09 October 2019 7,454 5 View

Coordination of ketones to iron?

Hello everyone, I would like to know if someone have a reference or a possible explanation about if ketones (2-propanone or ethyl acetate) could coordinate to iron (metal or cation)? Since...

08 September 2019 1,237 4 View

I have a error in gaussian G09 :( I need help? transition state?

Hi dear scientists! I am trying to find a transition state using QST2 and rob3ylp 6-31g(d,p)... Nevertheless, in all cases my run fails.. The next paragraph appear in my file.log: "Old...

01 February 2019 792 7 View

How can I explain that after incorporation of metal over surface of mesoporous materials, the acidity increase with a lower amount of metal....????

Hi dear Scientists! :) I was impregnating Fe or Cu over different mesoporous materials, and after TPDA analysis I concluding that when I decrease the percentage of metal over surface of...

10 November 2018 1,211 5 View

About acidity analysis with pyridine. ?

Hi everyone, I just have a problem to determine the amount in mili o micro moles of pyridine adsorbed in a material. I only have results of area of pyridine from company that they did the...

06 July 2018 9,134 1 View

What is the difference between intermediate and intermediary?

Hi everybody! I have a partner in the laboratory that don't believe me (Miguel at Antioquia University- Colombia) about what is the difference between intermediate and intermediary? Is it...

03 April 2018 3,400 3 View

How to choose the best model in a experimental design? Box-Behken design vs central-composite design?

Hi Scientists!! I am trying to choose the best model in a experimental arrangement of four factors and three levels. I don't know what model is more correct? I chose Box-Behken but I am thinking...

09 October 2017 1,106 11 View

What is more stable: Ortho or para hydrogen?

08 September 2017 4,607 2 View

How to explain the second step in the reaction mechanism of alpha pinene epoxide with ethanol and temperature?

Hi, I'm trying to explain the formation of the final compound in the reaction of alpha pinene epoxide with ethanol, a very interesting topic in the formation of add-value chemical substances. I...

07 August 2017 9,986 4 View

How to work catalysts and solid phase using Gaussian?

Hi everybody, Actually, I am simulating some process using Gaussian G09, specifically some molecules adsorbed over silica. But, I don't know how to explain if Gaussian works in gas-phase, what...

02 March 2017 9,087 4 View

flexibility of polymers chain

effect of double bond on the flexibility of polymers

07 April 2021 0 0 View

Formulation of polymer color flakes

I am writing to request some information for making polymer color flakes. I would appreciate the help.

17 March 2021 0 0 View

What is the production process of CaFe ferroalloys?

I looking for ferro calcium production process

03 March 2021 1,755 4 View

Chlorinated organic formation in odor control scrubbers using hypochlorite?

I'm involved in a study of odor control technologies for municipal wastewater treatment plant. One of the control options involves a chemical 2-stage (acid/alkaline) packed bed scrubber. The...

03 March 2021 3,661 2 View

I need to image mesoporous silica nanoparticles that are in ~100 nm size and do high resolution TEM to look at mesopores. what grids should I use?

Need to image mesoporous silica nanoparticles using the TEM. Also, need high resolution TEM images to see the mesoporous structure. Kindly suggest what kind of grids to use. Thanks, Shatadru

02 March 2021 1,787 2 View

What solvent can I used for Paal Knorr reaction between 6-amino hexanoic acid and 2.5 hexanedione?

I am try to make the Paal Knorr reaction between 2.5 hexnedione and 6-amino hexanoic acid, my problem is type of solvent to use, because 6-hexaminohexanoic acid is soluble in water but I am not...

02 March 2021 4,443 2 View

12% ledeburitic cold work tool steel, etched for revealing retained austenite, any help for clarifying?

Hello everyone. Given microstructure image belongs to a 12% ledeburitic cold work tool steel (annealed and tempered). The sample was etched with picral (100 mL ethanol and 4 g picric acid). I...

02 March 2021 4,119 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

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