Can electrophoretic mobility measurements of polymer-coated AuNPs be used to infer the role of charge (if any) in their dispersion stability?

Hello Everyone, We have stable citrate-coated AuNPs dispersed in water. Different polymeric protective coatings (PEG, PVP, BSA) have been chemically grafted to the citrate-coated AuNPs for...

17 November 2020 2,903 16 View

How does a Bi-Static FMCW radar detect a Zero Doppler target?

27 September 2020 8,370 6 View

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...

15 February 2020 6,617 9 View

What is the difference between a stabilizing agent (stabilizer) and a dispersing agent (dispersant) in a colloidal dispersion?

Can these two terms be used interchangeably as commonly seen in the literature? Under which category are surfactant and polymer additives or coatings classified when used in colloidal...

23 August 2019 1,833 6 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...

21 August 2019 3,779 6 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.

10 May 2019 5,571 6 View

In the laminar flow of a nanofluid with a liquid base fluid, can we use Knudsen number to show that the liquid phase can be treated as a continuum?

If so, how can we define the Knudsen number for solid nanoparticles dispersed in a liquid carrier? And how can the mean free path of liquid molecules be calculated? Conventionally, Knudesn number...

30 March 2019 8,265 28 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...

13 February 2019 6,698 5 View

Problem on reliability statistics - negative Cronbach's alpha?

In my study I want to see whether 3 items in a questionnaire relate to autonomy through a reliability analysis. The following three items are relevant I think: - Availability of task enrichment...

25 July 2018 3,223 2 View

What techniques can be used to locate fractures in underground metal water delivery pipes?

I recently met with an senior executive of a Water delivery company. #1 concern was the inability to locate leakage in underground mains pipes. Typically 40% of water is lost between source and...

24 May 2018 4,311 3 View

Waters 2707 HPLC autosampler problem?

I am using a 2707 waters HPLC device. When I try to inject a sample, it says missing plate or rack. I changed the needle and calibrated its position but I still get the same problem. I even get...

02 March 2021 1,408 1 View

Why are the velocities so high in my Boussinesq approximation Fluent simulation?

Hello, I have a mechanism where air rises due to convective flows. In this simulation, nothing is driving the air except this. I understand that the Boussinesq approximation only works for small...

02 March 2021 4,910 3 View

What is the characteristic length to determine the Reynolds number for the scattered turbulent fluid flow?

Dear all, I just saw this example in FB on the difference between laminar flow and turbulent flow. The flow from a pipe hits the sink and scattered. The flow from the pipe is characterized as...

02 March 2021 1,999 5 View

How optimize the Size Exclusion Chromatography?

Hello! I'll do a size exclusion chromatography, but I only have an open column, and I'll perform the peptide extraction from yeast, using buffer lysis (sodium phosphate 50 mM/NaCl 30 mM/DNAse and...

01 March 2021 2,215 2 View

Can we distinguish the type of free fluid inside the pelvic and abdominal cavities whether blood or serous fluid using the ultrasound?

during ultrasound examination of acute abdomen, sometimes we see free fluid , can we know the type of fluid ,whether blood or not , using ultrasound only? if yes , what are the sonographic...

01 March 2021 7,476 4 View

How much pressure we can reduce at the outlet to avoid Reverse Flow?

I am simulating Heat Exchanger. I have tried and tested all the methods to resolve this issue from the internet like refining mesh, improving skewness and orthogonal quality ,extending outlet to...

01 March 2021 6,985 3 View

How to show arrows over the streamlines in CFD-post?

I follow this to make streamlines like the photos attached below: (software- CFD post-processing) First I plot the 2D streamline over a surface "streamline 1". them I plot a vector by the...

01 March 2021 8,668 3 View

Timeout error!! Processor in the loop (PIL) using STM32F4 Matlab 2018a?

Dear Researchers I am trying to perform a PIL simulation using STM32F4 Discovery board and comunication serial USB TO TTL. During simulation I receive the following timeout error: An error...

01 March 2021 2,327 1 View

Precipitate after adding laemmli buffer to protein solution containing Potassium Acetate?

Hi, I am running a size exclusion chromatography experiment with a buffer containing Potassium Acetate as a salt. I analyse these fractions through SDS-PAGE. After boiling my SEC fractions in...

01 March 2021 2,622 3 View

Any research papers for extraction of nutrient deprivation on macroalgae? Analysed by HPLC-UV and GC/MS. Possibly from macroalgae genus Rhizoclonium?

I am doing my thesis on the nutrient deprivation on the macroalgae Rhizoclonium sp. I will be analysing the levels over a period of roughly 5 days by HPLC-UV and GC/MS. I will be using seawater as...

28 February 2021 6,477 1 View