Revision as of 18:50, 3 December 2016

There's plenty of building material in the atmosphere. SVG
(variable atmospheric humidity omitted)

Two motivations must be seperated:

• greenhouse gas reduction
• carbon extraction for productive use

Carbon dioxide collectors have the potential to fulfill the global energy needs and remove the the excess CO₂ that had accumulated due to burning of fossil fuels along with other unwanted gasses of industrial origin.

Devices for the removal of CO₂ from the atmosphere do not need and probably should not be able to do self replication. Making such devices macroscopic seems to be a better alternative than making them in the micro- to nanoscale. It makes handling them easier (even collectible by hand) allows for more control and less environmental spill.

• Carbon extraction must stop at a certain level - otherwise all plants on earth may be in severe danger.
• Every conscientiously designed mobile (airborne/seaborne) device must care about its fate after their end of service.

Medium

Sub-classes:

• stationary carbon dioxide collectors
• mobile carbon dioxide collectors
  Locating solar cells for CO₂ recuperation sparsely distributed in the air or on the sea instead of placing them concentrated in one place on the ground may be good for environmental (no pave-over) and political reasons.

Land (more or less stationary)

• Nanofactories that use air directly as building material.
• devices looking slightly akin to trees (TODO: what are the benefits of this shape vs flat solar cells)
  placement in inhabited areas - environmental issues!

Water (seaborne)

Concept art of buoy for collection of atmospheric CO₂. SVG - mobile carbon dioxide collector buoys

Seaborne mobile carbon dioxide collector buoys of a size that is easy to handle. Swimming units have the benefit of easier access to wind power and easier propulsion. They can easily be kept stationary. They need only plain air as lifting medium can use the wind for propulsion and are easier to collect manually (skimming) if something goes wrong.

Air (airborne)

Micro airships: Mobile carbon dioxide collector balloon

• have a very lightweight bubble as main body in a size range between 10um and 100.000um
• use depending on size thermal heating or hydrogen for lift
• use their surface for harvesting of solar energy
• are capable of water capture and splitting for compensation of hydrogen diffusion loss
• may be capable of carbon dioxide capture and splitting
• may be capable of self replication
• may (if malicious) create some nasty gasses

Extraterrestrial application

• usage on Venus
• usage in Gas giant atmospheres

Questions

• packing and shipping CO₂ or preprocessing it right away?

To investigate: If replicative how fast could they replicate (doubling time) depending on their diameter?
What is the limiting factor: solar-power for hydrogen generation, diluteness of CO₂ or something else?

To investigate: Can they be made to actively propel themselves? Their high volume to mass ratio makes this rather difficult when there's even the slightest bit of wind. Flattening the bubbles drops the aerodynamic resistance significantly.

To investigate: AP manufactured solar cells & mechanosynthetic carbon dioxide splitting

Related

• Mobile in general: Mobile carbon dioxide collector
• Seaborne: Mobile carbon dioxide collector buoy
• Airborne: Mobile carbon dioxide collector balloon
• Mechanosynthetic carbon dioxide splitting

• Josh Hall's high altitude mirror bubble concept (not necessarily handling atmospheric gasses) [todo: add video link]
• Mobile mesoscale robotic devices "nanobots"
• Mobile nanoscale robotic devices "microbots"
• atmosphere sentinels

External Links

• Diamond Trees (Tropostats): A Molecular Manufacturing Based System for Compositional Atmospheric Homeostasis - 2010 Robert A. Freitas Jr. pdf

[todo: split off makro and self replicating aspect from this page - distribute to sub-pages of Mobile robotic device ] [todo: tackle size and mobility decisions ] - done?