Coating Definition and 95 Threads

Hello Forum, to obtain good anti-reflection at one specific wavelength, a layer of the right index of refraction is deposited on a certain surface. The layer thickness must be d=lambda/4... This achieves better transmission. If we used multiple layers we would get even better transmission...

Hi, mirrors are made by coating glass with tin and then silver. I was wondering whether it would be possible to coat other materials with silver e.g. fibreglass? Assuming of course that an appropriate smooth finish could be achieved that would produce a mirror like finish in the end.

Thin-Film Interference: Coating a Lens -- Answers found, explanation needed! Homework Statement Boxed answers are the correct ones. Homework Equations 2L=(m+1/2)(λ/n) for constructive interference (maximum reflection, bright film) 2L=(m)(λ/n) for destructive interference (minimum...

Homework Statement "A glass lens (nglass = 1.52) has an antireflection coating of MgF2 (n = 1.38). (a) For 517-nm light, what minimum thickness of the coating will cause reflection rays R2 and R4 to interfere destructively assuming normal incidence? (b) Interference will also occur between...

Is Passivation to s/s = to Zinc Clear Coating of s/s? I know passivation is adding a layer of chorosion inhibtor the the surface so can this layer be clear zinc or are these different means of coating s/s?

Metal nanoparticles (Au, Ag, Al or ...) can coat on porous silicon, the particles can be located inside the pores or on the silicon micro/nano structures. By applying this type of coating is there any change in band structure of porous silicon? As I've measured the band gap has changed.

Can anyone tell me why are Concanavalin A coated dishes used in cell imaging? Nancy

Hello there, Right now I'm in a physics lab in which I have a vacuum jar, a thin film evaporation apparatus, and the instructions to do something interesting. I'm looking at a bunch of ideas right now, but one project that appeals to me is a multi-layer anti-reflective coating. The way I'd...

Dear all, For a computer graphics rendering routine, I'm looking for an efficient way of computing the net Fresnel reflectivity of a glass (lens) surface with a quarter-wave coating for a wavelength range of 400--700 nm, and incident angles between 0 and 90 degrees to the normal. Incident...

Homework Statement You are to design a coating to enhance the detection efficiency of a silicon detector (n=3.42 at \lambda=351nm) (a) Is the coating a reflection or antireflection coating? (b) Should you use a higher or lower index material for the coating? Specify a material to use. (c)...

Homework Statement You are to design a coating to enhance the detection efficiency of a silicon detector (n=3.42 at \lambda=351nm) (a) Is the coting a reflection or antireflection coating? (b) Should you use a higher or lower index material for the coating? Specify a material to use. (c)...

I constructing 3D shape of about 2 millimeters sized. Which kind of optical coating will give me 10 degrees of half view angle for reflected light in visual spectrum ? thanks Alex

Homework Statement A transparent film (n = 1.6) is deposited on a glass lens (n = 1.76) to form a nonreflective coating. What is the minimum thickness that would minimize reflection of light with wavelength 500 nm in air? Homework Equations wavelengthXfrequency=c/n (Not sure if that's...

Hello- I recently etched an Altoids tin. I would like to leave the etched tin in an outdoor location as a memorial to something. The etching includes text, and I am worried about oxidation of the steel ruining the tin quickly. I would ideally like for this to last several years (as long as...

Does anyone have any expertise in the coating of WC tools? Are these tools coated by a deposition process (ex. CVD)?

Homework Statement To reduce reflections from glass lenses (n ≈ 1.5), the glass surfaces are coated with a thin layer of magnesium fluoride (n ≈ 1.39). What is the correct thickness of the coating for green light (510 nm vacuum wavelength)? Homework Equations \lambda = 2nd/(m+1/2)...

Homework Statement Stealth aircraft are designed to not reflect radar, whose wavelength is typically around 3.0 cm, by using an antireflecting coating. Ignoring any change in wavelength in the coating, estimate its thickness. ____cm Homework Equations Well, that's just the issue. I...

Homework Statement Constant for the diffusion of hydrogen through steel is D(steal) = 4 x 10^5 cm²/s. They try to improve steel tanks for hydrogen storage by applying the coating based on TiAlN alloys. What is the diffusion coefficient Dp of such coating, if the permeability of hydrogen is...

Homework Statement Constant for the diffusion of hydrogen through steel is D(steal) = 4 x 10^5 cm²/s. They try to improve steel tanks for hydrogen storage by applying the coating based on TiAlN alloys. What is the diffusion coefficient Dp of such coating, if the permeability of hydrogen is...

In order to prevent water from being absorbed into a silica based optical fiber, a very thin coating of polyimide (polyamide) is often applied to the outer cladding. This works very well to prevent water from penetrating into the hydrophilic silica. But polyimide is very hydrophilic as well...

Homework Statement A thin layer of a transparent material with an index of refraction of 1.27 is used a nonreflective coating on the surface of glass with index of refraction of 1.51. What should the thickness of the material be for it to be nonreflecting for light of wavelength 510nm...

Hello there PF. I'm currently attempting to repair an old headset of mine that had the cord broken. The only thing is that I can't get the wires to make a connection. I know that wires such as these have a special coating on them that prevents shorts when they're bundled inside insulation bare...

i am winding a transformer rated for 150A or more, and i can't find wire thick enough, in my neighborhood, to fit the profile. i did find a shop that sells bare wire at 8awg. so i thought i could put an enameled coating on each winding as i wound it. you dig? is there a commercial "lacquer" i...

Homework Statement What is the minimum thickness of coating which should be placed on a lens in order to minimize reflection of 661 nm light? The index of refraction of the coating material is 1.40 and the index of the glass is 1.65. Hint: You must take into account the 180 degree...

Homework Statement What is the thinnest film of MgF2 (n=1.21) on glass that produces a strong reflection for the light with a wavelength of 531 nm? Homework Equations Open-Closed Standing wave Fn= (nv/4L) v = Wave Length * F The Attempt at a Solution Basically, I tried to...

If I was to measure the transmission of light through a coated piece of glass(with a coating designed to scatter light). Do I expect the optical transmission to be different if the light is incident upon the coated side compared to if the light is incident on the uncoated side and exits through...

Hi all. I build a project that detects the level of the water reservoir and shows that digitally using the 7-segment display... It worked... This requires a wire with positive voltage (5V) to be at the bottom of the water reservoir (it's a copper - network wire) and a number of...

I would like to find out more about low-temperature processing ceramics. I'm a product designer and I am working on covering silver objects with ceramics but I am having some problems combining the two materials. Can anyone help me?

A material with an index of refraction of 1.44 is used to coat glass. The index of refraction of glass is 1.5. What is the minimum thickness of the coating that will minimize the reflection of light with a wavelength of 4680 A? Answer in units of µm. I know that the thickness for this is t =...

[SOLVED] Electrolysis, coating 2. Relevant equation Why electrolysis of aqueous zinc sulfate is not used for coating with zinc metal? The Attempt at a Solution The following reaction has more positive electrode potential: (SO4)2- + 4H+ + 2e => H2SO3 + H2O than the reaction 2H+ + 2e- => H2(g)...

Does anyone know what kind of coating has the following elements? Nickel 84.07% Phosphorus 14.17% Iron 1.76%

Homework Statement Suppose a reflected white light is used to observe a thin transparent coating on glass as the coating material is gradually deposited by evaporation in a vacuum, Describe color changes that might occur during the process of building up the thickness of the coating...

Hello I'm trying to solve a problem where I'm asked to find the optimum index of refraction for an antireflective coating on a piece of glass. In trying to derive an equation for it I keep coming across this in the internet (where 1,0, and s should be subscripts) n1=sqrt(n0ns) where n1 is...

Hi, Why is Chemical Conversion Coating done on ducts, fittings in aerospace Industry.

Hi, I hope this question is in the right section. I have a heatsink that consists of both aluminium and copper. It's started to corrode, oxidate etc. I've tried different chemicals (such as HCL, Salt and Vinegar, Coke, and a aluminum brighenter that consisted of hydrofluric acid and...

Why Zinc is so commonly use coat metals such as steel? I know that its a good corrosion resistant metal to use but what properties of zinc make it good to use under normal atmospheric conditions? Does it have to do with the oxide layer that it forms around it?

Hi everyone! I'm doing some research on spin coating, my precursor is TiCl4 and I mix it with ethanol, but I have cracks on my films, can anyone help me? The reaction is: Ticl4+ ethanol ---> TiO2 + HCl +... What effects does the pH and the type of alcohol used have? How can I change the...

Is there a technology available that would let me paint some small dots of a reflective coating on a golf ball, and then use a radar-type device to detect it? I know that a company called Radar Golf has developed a gps system that uses a chip inside a golf ball and a scanner to locate it, but...

Hello, This is not homework etc. I am in the work place (automotive industry) and have a question. It has been some time since I have taken any math courses. I am trying to calculate the theoretical weight of a known coating on the surface of a hollow cylinder and set this up in an excell...

I would like to Know which aluminium temper will get the best coating of Ni-Cr, the options I have are: 6063,6061,6082,6005. thanks

i'm guessing the answer is d). I am really not sure about that though... Can someone explain to me what the correct answer is suppose to be and why? Thanks.

Hi, I have no idea of how to do the following problem and what formulas I should use. Please help! Thank you. A spherical balloon has a conductive coating and we propose to inflate the balloon to a diameter of 0.1 meters by connecting the surface to a high voltage source. Suppose that the...

I'm working on a tribological problem involving a MoS2 coating, molybdenite, but am having a problem finding a suitable value for its elastic modulus (Young's modulus). Anyone got any insight ?

I'm doing a science experiment on how the coating of steel wool affects its rusting rate. I'm doing the background information right now. What I need help with is how to make sense of the chemical reaction of rust. Can someone give me examples of these things so it makes sense?? Corrosion is...

Does anyone know the thickness of a gold coating that would give me 50% transmittance and 50% reflectance? Thanks, Simon