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Questions related from Omar Z. Sharaf
Given that non-spherical particles (e.g., rods) will exhibit optical anisotropy due to their continuous rotational Brownian motion, and even if the scattering signal is concurrently obtained and...
10 August 2021 6,149 5 View
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...
18 November 2020 3,096 16 View
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...
16 February 2020 6,728 9 View
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...
24 August 2019 1,987 6 View
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...
22 August 2019 3,865 6 View
Fluid agitation techniques, such as ultrasonication and shear homogenization, are often used to break down soft particle agglomerates (i.e., particle clusters in a shallow secondary minimum) by...
15 August 2019 7,898 3 View
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.
11 May 2019 5,670 6 View
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...
31 March 2019 8,369 28 View
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...
14 February 2019 6,767 5 View
The secondary minimum in a classical DLVO potential curve is often at a relatively large surface-to-surface (or center-to-center) inter-particle distance. My question is: How can particles...
19 January 2019 7,919 2 View
Normally, to get the total radiative heat flux (qr) in W/m2 from the spectral radiative intensity (Ilamda) in W/(m2*um*str), Ilamda is integrated twice--with respect to solid angles and...
19 March 2017 9,751 5 View
Assuming that the outlet temperature from the combustion chamber is fixed by allowing enough fuel to be burnt with a fixed amount of air, is there a limit on the amount of superheated steam that...
22 February 2017 7,210 2 View
Is there a simple expression for the effective sky temperature in terms of only the ambient air temperature and the solar irradiance?
10 March 2015 4,389 5 View
I would like to confirm the soundness of a simple steady-state energy balance over a solar cell. Assume we take a solar cell as the control volume for an energy balance where the electrical...
10 March 2015 9,539 2 View
Why do we assume that Joule heating in a thermoelectric leg is evenly divided towards the hot and cold junctions? What is the thermodynamic principle behind this assumption? Any detailed...
27 February 2015 6,404 2 View
In multi-junction PV cell assemblies, why is it common for the substrate to be a metallic-ceramic-metallic structure? What purpose does each layer serve exactly?
20 February 2015 4,099 3 View
I need hourly measured weather data for different locations in the middle east, specifically in the United Arab Emirates (UAE). This includes hourly incident irradiance, ground-level temperature,...
19 February 2015 6,527 15 View
