Do you want a thin or thick stationary phase if we are considering the thickness of...
Do you want a thin or thick stationary phase if we are considering the thickness of a coating on an open wall or on packing material?
Homework Answers
Stationary phase directly affects on the retension, resolution, elution and temperature due to thin thickness elution comes faster hence retnesion time is smaller and separation get faster.
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Do you want a thin or thick stationary phase if we are
considering the thickness of...
An open tubular column with a diameter of 193 um and a stationary phase thickness on...
An open tubular column with a diameter of 193 um and a stationary phase thickness on the inner wall of 0.60 um passes unretained solute through in 57 s. A particular solute has a retention time of 485 s. What is the partition coefficient for this solute? K= What fraction of time does this solute spend in the stationary phase?
An open tubular column with a diameter of 187 um and a stationary phase thickness on...
An open tubular column with a diameter of 187 um and a stationary phase thickness on the inner wall of 0.88 um passes unretained solute through in 79 s. A particular solute has a retention time of 471 s (b) What fraction of time does this solute spend in the stationary phase? (a) What is the partition coefficient for this solute? Number Number 259.8 4.96 K= total
You want to coat a pane of glass that has an index of refraction of 1.54...
You want to coat a pane of glass that has an index of refraction of 1.54 with a 195-nm-thick layer of material that has an index of refraction greater than that of the glass. The purpose of the coating is to cancel light reflected off the top of the film having a wavelength (in air) of 540 nm. The coating material is very expensive, so you want to use the thinnest possible layer. 1) What should be the index of...
My question is related to Optics- Interference from thin films: If we wish to coat flat...
My question is related to Optics- Interference from thin films: If we wish to coat flat glass [ index of refraction (n)=1.50] with a transparent material (n =1.25) so that reflection of light at wavelength 600 nm is eliminated by interference.What minimum thickness can the coating have to do this? I know that the waves will experience a phase change of pi rad or (0.5 wavelength) since the first medium has a small index of refraction. How does this connect...
Considering two cultures of bacteria that are in the stationary phase and are going to be...
Considering two cultures of bacteria that are in the stationary phase and are going to be analyzed at the same time, but have been in the stationary phases for different lengths of time, can you determine which culture will have more viable cells based on what you know about the stationary phase and cell viability over time?
We want to coat glass with a quarter–wave thickness of mag- nesium flouride (n = 1.35?)....
We want to coat glass with a quarter–wave thickness of mag- nesium flouride (n = 1.35?). We’d like this coating to work across the visible spectrum. a. What should be the thickness of the coating? b. Plot the reflectivity of the coated glass as a function of wavlength from 400 to 800nm. How much does it reflect at the minimum and maximum wavlengths?
1. We want to make a thin film coating we can apply to the outside of...
1. We want to make a thin film coating we can apply to the outside of a glass window that will cancel (or at least significantly reduce) infrared light (heat) from getting into a house or car during the summer. Assume that the wavelength of this light is 1=2000 nm, the index of refraction of the air is n=1.00, the film is n=1.75 and the glass is 1.55. nm a. What minimum thickness of the film is needed? This film...
2. Precision lenses for lithography in the microelectronics industry are truly expensive. The ones we bought...
2. Precision lenses for lithography in the microelectronics industry are truly expensive. The ones we bought are not imaging as expected. We suspect some surface damage; we want to do SEM examination. Since they are non-conducting materials, we have been told to apply a conductive material (e.g. sputter-coated Au/Pd) to minimize image degradation due to surface charging. But I want to avoid having the coating bury the things I want to view. Please estimate the minimum coating thickness that I...
For a science experiment you need to electroplate a 120-nm-thick zinc coating onto both sides of...
For a science experiment you need to electroplate a 120-nm-thick zinc coating onto both sides of a very thin, 2.0 cm × 2.0 cm copper sheet. You know that the charge carriers in the ionic solution are divalent (charge 2e) zinc ions. The density of zinc is 7140 kg/m3. Part A If the electroplating apparatus operates at 2.0 mA , how long will it take the zinc to reach the desired thickness?
The specimen isn't very thick or thin, so we cannot assume a state of plane strain...
The specimen isn't very thick or thin, so we cannot assume a state of plane strain or plane stress. Thus we expect a fully 3D strain state at any given location in the specimen. For example: 7 a -30 25 -30 6 -42 um/m ( 25 -42c ) e= 1 Assume an isotropic material with Young's modulus of 27 GPa and Poisson ratio of 0.14. Given that a = -2, b = 3, and c = 3, what is the...
An open tubular column with a diameter of 193 um and a stationary phase thickness on the inner wall of 0.60 um passes unretained solute through in 57 s. A particular solute has a retention time of 485 s. What is the partition coefficient for this solute? K= What fraction of time does this solute spend in the stationary phase?
An open tubular column with a diameter of 187 um and a stationary phase thickness on the inner wall of 0.88 um passes unretained solute through in 79 s. A particular solute has a retention time of 471 s (b) What fraction of time does this solute spend in the stationary phase? (a) What is the partition coefficient for this solute? Number Number 259.8 4.96 K= total
You want to coat a pane of glass that has an index of refraction of 1.54 with a 195-nm-thick layer of material that has an index of refraction greater than that of the glass. The purpose of the coating is to cancel light reflected off the top of the film having a wavelength (in air) of 540 nm. The coating material is very expensive, so you want to use the thinnest possible layer. 1) What should be the index of...
1. We want to make a thin film coating we can apply to the outside of a glass window that will cancel (or at least significantly reduce) infrared light (heat) from getting into a house or car during the summer. Assume that the wavelength of this light is 1=2000 nm, the index of refraction of the air is n=1.00, the film is n=1.75 and the glass is 1.55. nm a. What minimum thickness of the film is needed? This film...
2. Precision lenses for lithography in the microelectronics industry are truly expensive. The ones we bought are not imaging as expected. We suspect some surface damage; we want to do SEM examination. Since they are non-conducting materials, we have been told to apply a conductive material (e.g. sputter-coated Au/Pd) to minimize image degradation due to surface charging. But I want to avoid having the coating bury the things I want to view. Please estimate the minimum coating thickness that I...
The specimen isn't very thick or thin, so we cannot assume a state of plane strain or plane stress. Thus we expect a fully 3D strain state at any given location in the specimen. For example: 7 a -30 25 -30 6 -42 um/m ( 25 -42c ) e= 1 Assume an isotropic material with Young's modulus of 27 GPa and Poisson ratio of 0.14. Given that a = -2, b = 3, and c = 3, what is the...
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