In simple words, what is the difference between Isoelectric Point (IEP) and Point of Zero Charge (PZC)?

There seems to be a lot of arbitrary and sometimes contradictory explanations for the difference between the Isoelectric Point (IEP) and the Point of Zero Charge (PZC). Other times, the two terms...

01 February 2020 9,932 5 View

Can we infer anything about the potential (or charge) at the particle or Stern surfaces of solid nanoparticles from zeta-potential measurements?

Up to my understanding, zeta potential is supposed to be the electrokinetic potential at the imaginary surface-of-shear in an EDL. The way it is estimated is by relating it to the measurable...

07 August 2019 5,829 4 View

If "nanopowders" are in fact nano, shouldn't they be invisible to the naked eye? Are there any methods to actually produce nano-sized dried particles?

Up to my knowledge, nanopowders are usually produced from synthesizing nanoparticles in gas phase or by drying them from liquid phase. In reality, this results in particle clusters that are not...

07 August 2019 9,278 7 View

Can we have solid bridges forming between nanoparticles in aqueous environments?

Solid bridging (e.g., due to ambient-temperature sintering and solid-solid diffusion) often occurs between dried nanoparticles. My questions is: Upon the "physical" contact between two...

07 August 2019 5,275 7 View

Shouldn't nanofluids be defined as colloidal dispersions with nano-sized particles?

If so, why are they defined as "suspensions" in the majority of literature, including high-ranked journals? Although both are heterogeneous two-phase systems, as far as I know, in suspensions,...

05 June 2019 6,031 12 View

What is a good implicit method for solving the unsteady convection-diffusion equation with highly non-linear source terms in 2D using FDM?

Can ADI be used in this case? In all textbooks I went through, ADI is only used for 1D conduction or convection-conduction problems. I am interested in converting my current explicit code into an...

04 May 2019 6,720 8 View

Is it possible to define stream-function in 3D flow? If so, what is the physical meaning of stream-function in 3D?

I am aware that several definitions of stream-function in 3D flow do exist in the literature. But I am at a loss on what stream-function physically means in 3D.

04 May 2019 8,562 6 View

For colloidal particles in a liquid medium, do we have viscous retardation (lubrication) and/or liquid bridging (capillary) interparticle forces?

Also, how do these hydrodynamic interparticle forces compare against hydration/depletion solvation-type interparticle forces? Are they all of the same nature? It seems to me that liquid bridging...

01 February 2019 7,778 7 View

Do nanoparticles acquire a surface charge when suspended in pure water?

If the answer is yes, then does the charge acquisition mechanism change with respect to metallic, metal oxide, and carbon-based nanoparticles? And would it also change between totally pure water...

01 February 2019 8,776 6 View

Is there a dimensionless group that measures the importance of thermal radiation relative to forced convection heat transfer in internal channel flow?

Which would be useful in order to systematically estimate conditions under which radiation heat transfer can be neglected. Assume an absorbing/emitting fluid.

08 September 2018 9,295 8 View

error in running a model in Abaqus

Excessive rotation of nodes in node set ErrNodeExcessRotation-Step1

17 August 2021 0 0 View

error in modelling model in Abaqus

Excessive rotation of nodes in node set ErrNodeExcessRotation-Step1

17 August 2021 0 0 View

MGL tools

20 June 2021 0 0 View

fatal error

When I tried to energy minimization my system, I got fatal error as below. Fatal error: Atomtype opls_116 not found Although I've already added this line: ; include water #include "oplsaa.ff/spc.itp" to [molecultype] directive in my topology.

16 June 2021 0 0 View

fatal error

When I tried to energy minimization my system, I got fatal error as below. Fatal error: Atomtype opls_116 not found Although I've already added this line: ; include water #include "oplsaa.ff/spc.itp" to [molecultype] directive in my topology.

16 June 2021 0 0 View

fatal error

When I tried to energy minimization my system, I got fatal error as below. Fatal error: Atomtype opls_116 not found Although I've already added this line: ; include water #include "oplsaa.ff/spc.itp" to [molecultype] directive in my topology.

16 June 2021 0 0 View

fatal error

When I tried to energy minimization my system, I got fatal error as below. Fatal error: Atomtype opls_116 not found Although I've already added this line: ; include water #include "oplsaa.ff/spc.itp" to [molecultype] directive in my topology.

16 June 2021 0 0 View

i have some problem with chtMultiRegionSimpleFoam

--> FOAM FATAL ERROR: Maximum number of iterations exceeded From function Foam::scalar Foam::species::thermo::T(Foam::scalar, Foam::scalar, Foam::scalar, Foam::scalar (Foam::species::thermo::*)(Foam::scalar, Foam::scalar) const, Foam::scalar (Foam::species::thermo::*)(Foam::scalar, Foam::scalar) const, Foam::scalar (Foam::species::thermo::*)(Foam::scalar) const) const [with Thermo = Foam::hConstThermo >; Type = Foam::sensibleEnthalpy; Foam::scalar = double; Foam::species::thermo = Foam::species::thermo >, Foam::sensibleEnthalpy>] in file /home/ubuntu/OpenFOAM/OpenFOAM-4.1/src/thermophysicalModels/specie/lnInclude/thermoI.H at line 66. FOAM aborting #0 Foam::error::printStack(Foam::Ostream&) at ??:? #1 Foam::error::abort() at ??:? #2 Foam::heRhoThermo >, Foam::sensibleEnthalpy> > > >::calculate() at ??:? #3 Foam::heRhoThermo >, Foam::sensibleEnthalpy> > > >::correct() at ??:? #4 ? at ??:? #5 __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6" #6 ? at ??:?

24 March 2021 0 0 View

After a reference from Int J Body Compos Res, can any body help?

Hi, I am after the reference below, my library says it cannot obtain a copy either locally or internationally, any help appreciated! Chris Wang ZM, Heshka S, Wielopolski L, Pi-Sunyer FX, Pierson...

03 March 2021 6,193 1 View

Irradiation data for JAPAN?

Hi, Could you help me to get the latest (2019, 2020) solar resource data for a particular site in JAPAN? PV GIS and NSRDB data are not in reach to JAPAN, I'm looking for some other database for...

03 March 2021 961 3 View