FCS focal volume calibration ?

I am trying to calibrate the focal volume of FCS setup by using Alexa 488 dye. The experiments is being carried out at room temperature (25 degrees). I have to take the diffusion coefficient of...

05 June 2019 5,447 1 View

Optimum dilution of microgels for FE-SEM imaging?

What would be the optimum dilution of microgels that should be used in the case of FE-SEM sample preparation? I would be using a glass substrate for imaging. I will either spin coat or dry the...

03 April 2016 9,856 4 View

Anyone familiar with the Hofmeister series, arrangement of ions?

In the typical Hofmeister series for ex F->Cl->Br->I-(Ionic radius 0.133,0.181,0.196,0.220 respectively), The ions on the left of Cl- is a Kosmotrope, whereas the ions on the right are...

11 December 2015 7,547 2 View

Possible uses of refractometer?

10 November 2015 2,963 1 View

Turbidity- What wavelength technique determines the N value and hence colloidal stability of microgels?

Turbidity-wavelength technique is used by many to determine the 'n' value and hence the stability of the microgels. The formula used for the same is n=-(dlog tur/dlog lambda). Here turbidity can...

10 November 2015 1,535 5 View

Any advice on DLS experiments of microgels?

I have prepared a microgel (solvent water) and during the process I have added NaOH to maintain the pH of the solution as 12. Microgels have formed. Now when I do DLS experiments I saw that the...

09 October 2015 8,101 6 View

Mole percent to grams?

07 August 2015 8,024 0 View

Polymer hydrogel preparation ?

Is anyone working or is aware of a hydrogel which can be prepared at room temperature? (Without heating it to higher temperature above room temperature Ex: PNIPAM hydrogel )

06 July 2015 9,449 3 View

Why do I get microgel particle aggregation?

I have prepared microgel particles whose size should be around 100-150 nm. I have filtered the sample with the help of 250nm filter. But when I am carrying out the dynamic light scattering...

06 July 2015 4,511 9 View

Anyone familiar with PNIPAM microgel rheology?

In the figure given below, they have measured the relative viscosity of the microgels by varying the polymer concentration c(wt%). I had a doubt that, here whether they have prepared different...

04 May 2015 6,425 9 View

Does the pressure(-600 mmHg) affects pH?

When I conducted the degassing experiment using decompression under anaerobic condition(and I used ferrous based chelating agent), the oxidized ferric were observerd. So, could you tell me the...

03 March 2021 4,892 5 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

Which database would give me this list of chemical components?

Dear colleagues: I would like to know if anyone knows of a database that gives me the parameters pH, K, K, Mg, P, C, N, Zn, Cu, Ni and Cd of common foods. I find a lot of information of proteins,...

26 February 2021 5,525 3 View

Why is NH4OH added in heavy metals limit test?

The limit test I'm referring to is USP method II. In this procedure you need to dropwise add 6N of NH4OH to the sample until it the pH is alkali. After that you need to dilute and add HOAc until...

23 February 2021 2,049 3 View

Is there an ideal incubation time of RGO-modified SPCE before subsequent use, i.e., electrochemical characterization or further modification?

I notice that upon washing and air-drying of my RGO/SPCE surface and characterizing again via DPV, the current response towards ferricyanide probe significantly decreases. My worry is that the...

22 February 2021 5,324 3 View

No title

22 February 2021 9,932 11 View

Can anyone help or comment on solubilising chlorobutanol in aqueous injections in minimum time possible?

Please suggest solubilisation of chlorobutanol in injections. Tried pH and high temperature. But the issue is of assay drop. If anyone can suggest any solution. Its a commonly used excipient for...

21 February 2021 7,397 1 View

How to resolve Gaussian error termination " Error termination via Lnk1e in F:\G16W\l103.exe" for TS(QST3)?

When I run the job for TS(QST3) in gaseous phase, it was completed without any error. But when I add water in CPCM model it terminated with an error: Inconsistency: ModMin= 2 Eigenvalue=...

21 February 2021 3,198 2 View

What reaction will occur when adding hexamine into ammonium nitrate in an acidic medium?

Hello, I am investigating properties of water in oil emulsion explosives. And adding hexamine (hexamethylenetetramine) into one of the phases that are used to make the emulsion should increase the...

21 February 2021 8,680 1 View

What properties of water shall be analyzed and evaluated to test the effectiveness of activated carbon?

I would like to ask what other properties of water (pH and such) shall be analyzed and evaluated to test the effectiveness of activated carbon from filtering the contaminants present in the water?

20 February 2021 9,422 8 View