Re: [Vo]:a tip for Ni/H developers
https://chemistry.osu.edu/~coe/research/documents/Coe_NiSPS_jp034934w.pdf look at figure 1 as a comparison of the optical properties of these metals. For nickel in the infrared, the real and imaginary components of the dielectric are almost identical promoting resonances. "The condition for narrow resonances is satisfied by silver and gold throughout the visible and infrared regions; therefore, these are the metals of choice for work in the visible region. Chemically interesting metals such as nickel (as shown in Figure 1) chromium, palladium, platinum, and tungsten satisfy narrow resonance conditions only in the infrared" Note that chromium, palladium, platinum, and tungsten are all used in LENR because of their superior Plasmon friendly characteristics in the infrared. On Wed, May 28, 2014 at 11:56 PM, wrote: > In reply to Axil Axil's message of Wed, 28 May 2014 22:16:29 -0400: > Hi, > > >"Heat based technologies have the added requirement to maximize > temperature > >rise, which implies minimizing radiation in the thermal infrared band. > Thus > >there are conflicting requirements of strong absorption in the visible, > >with minimum emission in the far infrared range; the figure of merit > >for this is termed selectivity. " > > > >The requirement called for here is for minimum emission in the far > infrared > >range. Minimum emission means refection. > > Actually the called for requirement is for maximum absorption in the > visible > range *combined* with minimal emission in the far infrared. > > http://arxiv.org/ftp/arxiv/papers/1202/1202.6603.pdf appears to > concentrate > primarily on the properties in the visible range. I don't see any mention > of the > properties of Nickel in the far infrared. > Perhaps you could point it out? > > > > > > >Nickel meets the requirement because it has minimum emission in the far > >infrared range. > > > >"This paper has studied absorption in ultra-thin layers of nickel, gold > and > >silver. It is shown that nickel possesses optical properties that make it > >ideal for use in solar thermal and solar thermionic applications and that > >there is an optimum thickness for maximising absorption across the solar > ^^ > >spectrum of ~10-13nm." > [snip] > Regards, > > Robin van Spaandonk > > http://rvanspaa.freehostia.com/project.html > >
Re: [Vo]:a tip for Ni/H developers
In reply to Axil Axil's message of Wed, 28 May 2014 22:16:29 -0400: Hi, >"Heat based technologies have the added requirement to maximize temperature >rise, which implies minimizing radiation in the thermal infrared band. Thus >there are conflicting requirements of strong absorption in the visible, >with minimum emission in the far infrared range; the figure of merit >for this is termed selectivity. " > >The requirement called for here is for minimum emission in the far infrared >range. Minimum emission means refection. Actually the called for requirement is for maximum absorption in the visible range *combined* with minimal emission in the far infrared. http://arxiv.org/ftp/arxiv/papers/1202/1202.6603.pdf appears to concentrate primarily on the properties in the visible range. I don't see any mention of the properties of Nickel in the far infrared. Perhaps you could point it out? > > >Nickel meets the requirement because it has minimum emission in the far >infrared range. > >"This paper has studied absorption in ultra-thin layers of nickel, gold and >silver. It is shown that nickel possesses optical properties that make it >ideal for use in solar thermal and solar thermionic applications and that >there is an optimum thickness for maximising absorption across the solar ^^ >spectrum of ~10-13nm." [snip] Regards, Robin van Spaandonk http://rvanspaa.freehostia.com/project.html
Re: [Vo]:a tip for Ni/H developers
"Heat based technologies have the added requirement to maximize temperature rise, which implies minimizing radiation in the thermal infrared band. Thus there are conflicting requirements of strong absorption in the visible, with minimum emission in the far infrared range; the figure of merit for this is termed selectivity. " The requirement called for here is for minimum emission in the far infrared range. Minimum emission means refection. Nickel meets the requirement because it has minimum emission in the far infrared range. "This paper has studied absorption in ultra-thin layers of nickel, gold and silver. It is shown that nickel possesses optical properties that make it ideal for use in solar thermal and solar thermionic applications and that there is an optimum thickness for maximising absorption across the solar spectrum of ~10-13nm." In the Ni/H reactor, the dimension of the nickel nanowire such be in the 10-13 nm range. This is confusing because it is referring to absorption in the visible range. However, The ability of nickel to reflect light in the far infrared range makes it ideal for LENR applications. On Wed, May 28, 2014 at 6:02 PM, wrote: > In reply to Axil Axil's message of Mon, 28 Apr 2014 02:37:40 -0400: > Hi, > [snip] > >http://arxiv.org/ftp/arxiv/papers/1202/1202.6603.pdf > > > > > > > >*Ultra-Thin Metal Films for Enhanced Solar Absorption* > > > > > > > >To optimize photonic responsiveness, one of the reasons that nickel is a > >great LENR material is that it is an ideal reflector of light, > specifically > >infrared light. > > How do you get "reflector" from "Absorption"? > > > Regards, > > Robin van Spaandonk > > http://rvanspaa.freehostia.com/project.html > >
Re: [Vo]:a tip for Ni/H developers
In reply to Axil Axil's message of Mon, 28 Apr 2014 02:37:40 -0400: Hi, [snip] >http://arxiv.org/ftp/arxiv/papers/1202/1202.6603.pdf > > > >*Ultra-Thin Metal Films for Enhanced Solar Absorption* > > > >To optimize photonic responsiveness, one of the reasons that nickel is a >great LENR material is that it is an ideal reflector of light, specifically >infrared light. How do you get "reflector" from "Absorption"? Regards, Robin van Spaandonk http://rvanspaa.freehostia.com/project.html
Re: [Vo]:a tip for Ni/H developers
Axil-- You do not mean to coat the surface of the Ni nano particles themselves do you? It seems only the inner surface of the reactor vessel which is a small pressure vessel, rather than the nano particles should be coated.However, it may be desirable to transmit the infrared across the reactor vessel wall to the external coolant to effect better heat transfer. One other suggestion is in order to achieve the size control of the Ni nano particles, developers should consider ball milling Ni in a cryogenic ball milling machine using N ( maybe liquid H) as the liquid in the process. The N (and potentially H) will coat every small particle with a thin--one or two atom layer-- of N (or H) during the process and assures that particles do not agglomerate during the milling process. Better size uniformity will likely be accomplished in the process. Cost effectiveness for production of nano Ni in house may be significant. The Ni particle surface resulting may be more active for LENR. The loading of the reactor vessel could be accomplished as a slurry of liquid N or H as the case may be with a warming period to evaporate the N or H. For a H slurry loading of the reactor could be accomplished in the same warming operation as the H turns to a gas. (Liquid N would be safer and cheaper to use than liquid H in the milling operation.) Lastly the homogeneous distribution of any catalyst could effectively be accomplished during the milling operation, which effectively mixes all constituents in the machine. The coating of each particle as it is attrited in the operation is significant in achieving a homogeneous mixture, if this is desirable. Development would be necessary to make sure the ball milling operation, as it is perfected, produces nano size particles of the correct dimensions and mixed catalysts as desired. Whatever milling balls are selected they should be very hard compared to the Ni or catalyst being attrited. For example Haynes-25 cobalt alloy balls may be warranted. Bob. - Original Message - From: Axil Axil To: vortex-l Sent: Sunday, April 27, 2014 11:37 PM Subject: [Vo]:a tip for Ni/H developers http://arxiv.org/ftp/arxiv/papers/1202/1202.6603.pdf Ultra-Thin Metal Films for Enhanced Solar Absorption To optimize photonic responsiveness, one of the reasons that nickel is a great LENR material is that it is an ideal reflector of light, specifically infrared light. Furthermore, the ideal thin film thickness of nickel to optimize optical performance is between 10nm and 13 nm. All surface on your Ni/H reactor should be coated with a nickel thin film whose thinness is between 10nm and 13 nm.
[Vo]:a tip for Ni/H developers
http://arxiv.org/ftp/arxiv/papers/1202/1202.6603.pdf *Ultra-Thin Metal Films for Enhanced Solar Absorption* To optimize photonic responsiveness, one of the reasons that nickel is a great LENR material is that it is an ideal reflector of light, specifically infrared light. Furthermore, the ideal thin film thickness of nickel to optimize optical performance is between 10nm and 13 nm. All surface on your Ni/H reactor should be coated with a nickel thin film whose thinness is between 10nm and 13 nm.
