UV-Visible Spectroscopy

UV-Visible Spectroscopy refers to absorption spectroscopy in the ultraviolet-visible spectral region of the light spectrum. | Contact experts in UV-Visible Spectroscopy to get answers

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Questions related to UV-Visible Spectroscopy

I got larger particle size using TEM than DLS, although there is no aggregation as shown in TEM image then what could be the reason behind it?

Particle size by tem found to be 350 nm while dls give size of 200 nm, what could be possible reason?

07 August 2023 8,964 6 View

Can we consider 5 atomic thick layer as bulk? up to what thickness we can call a material 2D?

And please explain when we observe quantum confinement going below 10nm.

28 June 2023 9,831 0 View

Can someone suggest softwares to calculate the Judd-Ofelt parameters?

I am working in luminescence material in glass ceramics doping to rare earth materials and Judd Oflet parameters calculations. I need this calculation. It is possible to propose software that can...

05 June 2023 5,772 3 View

Do you have any guideline or paper for soil nutrient imbalances for plant growth?

Hi I'm looking for a guideline or a document for main nutrient imbalances for crops and their significance, such as P/Zn, P/Fe, P/Mn, S/P, Ca/Mg, K/Ca, K/Mg, K/Na, Fe/Mn, Fe/Zn, Na/Mg or Na/Ca,...

24 May 2023 5,763 3 View

Adsorption of methylene blue ? is absorption occurs in adsorption process?

Hello there , i did adsorption of methylene blue by chitosan and sodium alginate and bentonite bead, does occur absorption in the same time?

17 May 2023 4,588 1 View

How can I analyse the changes in UV-Vis spectra after doing spectroelectrochemistry?

so I am doing UV-Vis electrochemistry and wants to see the reversibility of the hydrogen bond between diphenyl urea and the 1,4- dinitrobenzene. what changes i can expect in the absorption spectra...

21 April 2023 3,748 2 View

Why the Colour of Graphene Oxide Changes to Green and how can i Correct it?

I got green when I added Distilled water and H2O2 during the graphene oxide synthesis. I made it in a small amount and the color of the mixture changed successfully but when I tried to make it in...

14 April 2023 9,172 0 View

How I calculate refractive index from absorption coefficient cm-1?

How I calculate refractive index from absorption coefficient cm-1

30 March 2023 3,414 1 View

What is the best principle to use in detecting the presence of a bacteria? Is it fluorescence based assay or colorimetric sensor and reflected light?

Both system detects the carbon dioxide released by the bacteria by consuming the oxygen.

24 February 2023 4,997 2 View

If the nanopowder coated as thick film using Dr blade method, will there be any significant change in the XRD and SEM compared to powder sample?

I have been working on gas sensing application. For the same I synthesized ZnO nanopowder and studies XRD, SEM, TEM etc. For the sensing application I coated the powder as thick film using Dr...

09 February 2023 3,912 3 View

It is correct to perform Hydrodynamic interaction of active particles (in confinement) by 2D simulations?

I need to model a system of active particles in confinement and with hydrodynamic interactions between them and the walls of a channel. The channel is not constant but corrugated (smooth). The...

12 December 2022 2,346 0 View

Can a material after calcination reacts with oxygen present in air?

I have prepared oxide material-1 and coated that material-1 after calcination with another material-2. However, the material-2 absorbs the moisture present in air. Is it possible that material-1...

11 December 2022 8,644 4 View

Will the IR characteristic peaks of C2H4(ethylene) on Fe and Fe3O4 catalysts be distinguishable?

My catalyst has both Fe and Fe3O4. I am wondering whether the IR peaks of C2H4 molecules adsorbed on Fe and Fe3O4 sites will negatively or positively moving. If yes, is it distinguishable or not?...

01 December 2022 1,786 0 View

Is there any effect of incident x-ray intensity with the XPS method on the depth of the material layer?

It is known that surface measurement by X-ray photoelectron spectroscopy (XPS) is only to a depth of a few nanometers. Can it be used to measure the chemical content at a depth of a few microns...

11 November 2022 1,401 6 View

Need help in solving the Error in JOB in ORCA?

Below is the error statement I have got while doing the SP calculation through MDCI in ORCA. "Primary job terminated normally, but 1 process returned a non-zero exit code. Per user-direction,...

17 October 2022 5,629 3 View

Is the neutron capture cross section dependent on spin direction of the neutron?

I wonder the there was ever an experiment done, which investigated if the neutron capture cross section of a nucleus depends on the spin orientation of the neutrons. Can anyone name a reference? I...

07 October 2022 5,634 4 View

Can i link the raman peaks FWHW broadness with the conductivity?

Hello, I have some Raman measurments from different samples of the same material with different dopings, can i link the conductivity of the material with the raman results? Is there any good...

03 August 2022 9,257 4 View

How can I increase the MAXC1 value in Gaussian for FC calculation?

How to use the MAXC1 keyword in Gaussian 16 for the vibrationally resolved spectrum calculation?

20 July 2022 2,617 0 View

How can you calculate 20 mg Fe from the given formula : (MF: C4H6FeN2O4 MW: 201.95g/mol) in the percentage of Fe is 20% ?

How can you calculate 20 mg Fe from the given formula : (MF: C4H6FeN2O4 MW: 201.95g/mol) in which the percentage of Fe is 20% ?

13 June 2022 3,714 0 View

Can someone explain how to calculate the Judd-Ofelt parameters?

I am a PhD student in GJU S&T, I am working on rare earth doped single crystals. I have the same problem for calculating J-O intensity parameter. actually JOES calculate only Eu doped...

27 May 2022 7,669 5 View

How can we check the laccase trametes versicolor enzymatic catalyst activity while doing a dimerization of phenolic compounds derived from lignin ?

How can we check the laccase trametes versicolor enzymatic catalyst activity while doing a dimerization of phenolic compounds derived from lignin? What are the required conditions for safely...

24 March 2022 8,397 0 View

Does no absorbance peak in UV-Vis indicate no formation of nanoparticles?

I synthesized gold nanoparticles by pulsed laser ablation in different ph solutions. At acids 1 and 3, it didn't show any absorbance peak whereas at pH 7 and 11 it does have absorbance peak....

18 September 2021 6,228 2 View

Fusion with Laser Filamentation?

High power femto- and picosecond pulses can generate filaments in air at atmospheric pressure. The filament is basically a plasma column which exists for about 130ns after the short pulse...

16 September 2021 7,520 4 View

Is it possible to observe both kind of band gap in a material simultaneously?

I have synthesized plasma polymerized thin films. From UV-Vis data, I have calculated direct and indirect band gap using Tauc relation. Is it possible to observe both kinds of band gap in a...

15 September 2021 8,411 4 View

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