Does all mineral oil contains asphaltenes?

I had a mineral oil of 460cSt (containing sulphur and phosphorus), after addition of nanparticles (carbon nano tubes and graphene) the viscosity decreased significantly. literatures says that the...

07 August 2018 9,447 1 View

What can be the reason for high coefficient of friction and low wear scar in a lubricant containing carbon friction modifier and zinc oxide?

A lubricant contains zinc oxide nano particles and carbon FMs, the coefficiet of friction is high while the wear scar diameter is less for the samples. The load was 392N @1200rpm @75degree C.

03 April 2018 3,084 6 View

Does the coefficient of friction values depend on the type of tribometers used?

Experiments were carried out using pin on disc apparatus (120N, 800rpm, a flat faced pin 10mm, room temperature) and four ball test(120N,800rpm , AISI 52100 balls , 75 degree C). The lubricant...

11 December 2017 3,529 2 View

What is the Youngs Modulus of Zinc Oxide Nanoparticles?

Elastic modulus of Zinc Oxide nano particles

07 August 2017 7,994 2 View

How to explain the phenomenon of extreme pressure properties in case of graphene and carbon nano tube?

Graphene and carbon nano tubes shows better extreme pressure characteristics when used as additives.

06 July 2016 8,544 0 View

Can anyone tell me some applications where we use gears of hardness 22Rc-30Rc?

Specific Application please.

06 July 2016 3,358 2 View

Which is more preferable mixed lubrication regime or boundary lubrication regime?

06 July 2016 9,847 7 View

How does Young's modulus,shear modulus,Poisson ratio of a nano wire/tube/particle influence the coefficient of friction?

Mechanical properties influencing coefficnet of friction.

05 June 2016 1,316 2 View

Which roughness parameter would be more suitable to compare between steel surfaces : average roughness,skewness or kurtosis?Why?

05 June 2016 3,356 3 View

Does graphene exhibits better frictional properties than carbon nano tubes?

Graphene shows better frictional properties than carbon nano tubes.

05 June 2016 2,558 1 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

What is the production process of CaFe ferroalloys?

I looking for ferro calcium production process

03 March 2021 1,755 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

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

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

Why Austenite grains in steel show much more twinning than ferrite grains?

It is oftentimes said to be a distinctive metallographic trait that differentiates a fully austenitic and a fully felly ferritic steel without etching that might distinguish between two. Why...

02 March 2021 728 2 View

Discrete Phase model (DPM) particle break-up has particle size limits during particle tracking?

Hello, I am currently working on simulating water droplet partciles in a closed room. When I use uniform particles, without "particle break-up", I can carry out the simulation without any problem....

02 March 2021 3,053 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