Aug 30, 17 / Lib 18, 01 16:40 UTC
Re: Catalysis: project for future ¶
That may be after Catalysis: https://i4is.org/wp-content/uploads/2017/08/Principium18%20Aug2017%20opt.pdf (pp. 31-41).
Nov 27, 17 / Sag 23, 01 07:23 UTC
About this material I was referring to the front non-reflective side of the solar sail of probes-"sowers". I just didn't know that it already synthesized and started its industrial production. https://en.wikipedia.org/wiki/Vantablack
It remains to decide how best to place the catalysts in nanotubes.
This raises an interesting possibility. If this material absorbs heat from even a weak source, it is possible to start the biosynthesis already on the outskirts of the protoplanetary disk, far beyond the future "edge of ice" of the future of the planetary system, as the heater will allow you to condense and retain in the material liquid water.
Aug 1, 18 / Vir 17, 02 08:41 UTC
Raw material for "Sowers"?
https://arxiv.org/abs/1807.05768 (First Detection of the Simplest Organic Acid in a Protoplanetary Disk)
Perhaps soon will find more complex substances.
Aug 1, 18 / Vir 17, 02 08:54 UTC
Preliminary projects to create prototypes of various types of "Keepers" in the Solar system and its immediate surroundings: https://archmission.org/about.
And my humble involvement: https://archmission.org/crew/, Dmitry Novoseltsev.
I plan to develop and test a "solar petard" with the participation of Arch Mission Foundation using the same technology "Nickel ion-beam atomic scale storage" for data recording.
A little about " solar petard":
At present, one of the companies supporting Arch Mission Foundation, NanoRosetta (https://nanorosetta.com/ has technology of creation on thin plates of the polished nickel foil many heat resistant optical analog images read then by means of 500-fold optical microscope. 2x2 cm plate fragment can contain 8000 pages of text with illustrations. This device has some "windage", which allowed me to offer to larger groups such carriers design as "solar petard", which is an adapted variant of the classical scheme of "hot start" with a near-Solar orbit with a low perihelion by Prof. Gregory Matloff (Gregory L. Matloff, Eugene Mallove. Solar sail starships: the clipper ships of the Galaxy. Journal of the British Interplanetary Society, Vol. 34, pp. 371-380, 1981, http://path-2.narod.ru/design/base_e/sss.pdf). Himself G. Matloff in personal correspondence recognized the scheme successful.
The "solar petard" in the original version is a package of small (10x10 cm) sails with a thickness of about 5 microns of polished nickel foil (density is 8902 kg/m3, reflection coefficient of about 0.65, radiation coefficient of about 0.08), square section, on both sides of which, according to the above or other similar technology, the data are writed. The sails are glued together in a" sandwich" by thin, about 10 microns thick, layers of binder gas-generating composition-pyrotechnic, thermosetting or sublimation, with a sufficiently high ignition (gasification) temperature, relatively low combustion temperature, lack of soot and condensed phase in the products of gasification and solid residue, and sufficient mechanical strength. The purpose of the binder is to fasten the sails together into a single solid body until the start, while eliminating their welding together in a vacuum at an elevated temperature, and at the start – their separation and initial separation from each other.
In the original version, the "sandwich "is a cube of the standard Cubesat 1U format 10x10x10 cm, containing about 6700 carriers, and is output by the carrier rocket as a passing load together with a probe directed to the inner region of the Solar system (such as Parker Solar Probe, BepiColombo or "Mercury-P"). In the simplified version "sandwich" is a relatively thin plate 10x10 cm, consisting of a smaller number of sails with data recording, and attached to the outer surface of the probe by a long thin plastic tape. When the probe moves into the inner region of the Solar system due to thermal and radiation effects, the tape is destroyed, and the plate further moves autonomously along the trajectory of the probe at some distance from it.
The moment of operation of the "solar petard", which determines the starting acceleration of the sails, depends on the ignition temperature of the binder, as well as the reflection and radiation coefficients of the material sails. For the gasification temperature of 900 K, the starting point at a distance from the Sun is pre-determined of about 0.28 AU, i.e. inside the orbit of Mercury .
After the "petard" is triggered, the sails are separated and their acceleration begins according to the mechanism described in the above papers: (Gregory L. Matloff, Eugene Mallove. Solar sail starships: the clipper ships of the Galaxy. Journal of the British Interplanetary Society, Vol. 34, pp. 371-380, 1981, http://path-2.narod.ru/design/base_e/sss.pdf) and (Ultra-Thin Solar Sails for Interstellar Travel). Phase I Final Report. December 1999. Dean Spieth, Dr. Robert Zubrin, http://go2starss.narod.ru/pub/E32_UTSS.pdf).
The "petard" does not have any mechanisms for orientation and to trigger randomly rotates uniformly warming that provides a simultaneous ignition of the binder. As a result, after its operation, a small group of sails can be randomly oriented perpendicular to the Sun by the reflective surface and develop the greatest acceleration.
The rest will rotate randomly with a sufficiently high frequency, and the angle of incidence of sunlight on the reflective surface for them will change periodically from 0 (sail unfurled edge to the Sun) to 90 degrees (sail unfurled plane to the Sun). For them, the acceleration will be less.
According to preliminary estimates, the first "fast" group of sails at specified characteristics (nickel 5 microns thick) is capable of reaching a speed of 47 km/s relative to the Sun and theoretically leaving the Solar system in the Oort cloud, and the main "slow" group – to reach a speed of 34 km/s and linger on the outer edge of the Solar system and in the Kuiper belt.
In addition to the main task of the Arch Mission Foundation – the formation of long – term storage space libraries - such experiment will allow to observe the movement of a large group of solar sails through the Solar system and the real dispersion of their trajectories.
Now the main problem - in the choice of a binder for bonding of "petard". Paradoxically, the pyrotechnic compositions and designs known in rocket and space technology are not suitable for one reason or another.
I would be grateful for any recommendations.
Aug 3, 18 / Vir 19, 02 16:51 UTC
An interesting article about biological synthesis in different stars, up to the synthesis of RNA: http://advances.sciencemag.org/content/4/8/eaar3302.
This may be interesting for the design of "Sowers".
Aug 28, 18 / Lib 16, 02 03:20 UTC
About the same should work forest of nanotubes on the working surface of the "sowers", collecting and condensing water from the gas protoplanetary disk, in the project "Catalysis".
I am glad that someone already in commercial applied projects creates this technology and materials.
Aug 30, 18 / Lib 18, 02 05:51 UTC
Here is another of the modern prototypes of the "keeper" in my project "Catalysis"or Extrasolar library.
Unfortunately, this satellite is not planned to be sent outside the Solar system. But it is possible to copy the data from it to other special probes.
Aug 31, 18 / Lib 19, 02 10:12 UTC
This is perhaps the minimum complexity of the compound, which is required to synthesize by "sowers" for further autocatalytic biogenesis.
Sep 10, 18 / Sco 01, 02 08:05 UTC
On possible expansion of the zone of formation of inhabited planets (for the choice of positioning of " sowers"):
Sep 11, 18 / Sco 02, 02 04:37 UTC
Here's Brane Craft - another thin-film spacecraft that can serve as an early prototype of the "sowers" and "keepers":
Sep 24, 18 / Sco 15, 02 02:57 UTC
New data that can be used for the design of "sowers" and their work processes: