Why viscosity increases with torque and rpm?

I am calculating viscosity of my oil in water emulsion using a rotational viscometer with a disk shaped spindle. The fluid is less viscous upon observation. However when i measured the viscositu,...

04 May 2019 9,821 4 View

How to find interfacial tension of oil in water emulsion?

I have an oil in water emulsion of which i want to find interfacial tension using a pendant drop tensiometer. what is the correct procedure for the same?

04 May 2019 459 2 View

Does stability of emulsion depend in the way they are stored? (like in beakers and tubes)?

I have an oil in water emulsion in which more oil is dispersed in less amount of water, the oil is viscous in nature. the emulsion seems stable when kept in tubes while it the same seems unstable...

02 March 2019 3,043 3 View

Can a separated O/W emulsion be mixed again?

If an oil in water emulsion made by mixing oil in water using surfactant separates after sometime, then can it be mixed again to form the emulsion? Kindly provide references (if any) along with...

02 March 2019 6,808 1 View

How to make multiple emulsion samples of different composition from single large sample?

I am working on oil in water emulsion. i wanted to know that if i make a 250 ml emulsion of 60% oil and 40% water containing 1000 ppm surfactant and remove 50 ml from it for stability analysis....

09 October 2018 388 4 View

How to make multiple emulsion samples of different composition from single large sample?

I am working on oil in water emulsion. i wanted to know that if i make a 250 ml emulsion of 60% oil and 40% water containing 1000 ppm surfactant and remove 50 ml from it for stability analysis....

09 October 2018 4,118 1 View

What is the detailed procedure for SARA analysis of heavy crude oil?

I want the detailed procedure for SARA analysis, solvents required, apparatus and also detailed procedure on how to perform column chromatography with multiple solvents.

08 September 2018 7,180 4 View

What is the detailed process for column chromatography with multiple solvent systems?

I am working on crude oil and want to conduct SARA analysis which involves sequential elution with multiple solvent systems (4 as per ASTM procedure) i wany to know how to change solvent system in...

08 September 2018 8,943 3 View

What should be the diameter and height of the column if i want to separate 1gm or 0.5 gm of maltenes via SARA analysis?

I want conducting SARA analysis but i am unable to determine what dia column should i use and how much height od silica bed is required to effectively separate maltenes into 3 components.

08 September 2018 4,801 0 View

What are polymer based viscosity reducers? how they reduce viscosity of heavy crude? what research is going on in this field?

what is the mechanism by which the viscosity of heavy crude is reduced? what type of polymers are used as viscosity reducers? are they commercially available?

06 July 2018 2,169 0 View

Polymer composites suddenly solidifies?

I am making polymer composite by solvent mixing method. When I am trying to add filler solution in polymer solution it quickly get solidified. How to make them then uinform? It doesn't give time...

03 March 2021 7,540 4 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

How do I determine the degree of polymerization of PEG 400 based on NMR integration?

Hello, I am working on the photocatalytic degradation of PEG 400. I would like to know if it's possible to determine the degree on polymerization based on NMR integration, or by the MW of the...

02 March 2021 6,186 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

Heat exchanger with liquid Nitrogen as coolant?

I want to cool Natural Gas from 195 Kelvin to 138 Klevin in a heat exchanger by using liquid nitrogen as the coolant medium. When entering the heat exchanger, the liquid nitrogen will have a...

01 March 2021 6,450 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

POlymer+DMSO solution and moisture??

What could be the reason of moisture at the sides of Vial when I am preparing my polmyer+DMSO solution for membrane fabrication? What etiquettes I am possibly missing here?

28 February 2021 6,516 5 View

How to reduce residual stresses in MD simulation?

I am working on a preparation of representative polymeric structures of some popular polymers, such as polyimide or PTFE for MD simulation, during which a single nitrogen or oxygen atom will be...

24 February 2021 8,105 3 View

How to identify what type of fillers are in a polymer?

Hello everyone, I have some PHAs blended with fillers and nucleating agents, yet I don't know what kind of fillers or nucleating agents. The producer has shut down and there's no way to get in...

24 February 2021 1,356 8 View

How can I selectively dry etch Ti on a polymer substrate?

24 February 2021 5,378 1 View