From: David Sevier [mailto:[email protected]]
Sent: 15 April 2019 15:39
To: 'Andrew Lockley'
Subject: RE: [geo] titanium dioxide
Which interacts with gas at 600 MPH. Compared to on the ground surfaces that
mix with new air at 10 mph, this gives a sensible surface effect of 350 sq km –
larger than anything that currently exists to address this. If you still not
convinced, imagine putting this coating on thin Mylar balloons filled with
nitrogen gas floating above the height that planes fly. The nitrogen filled
balloons will be stable in the upper atmosphere for periods of time greater
than 10 years. We could cheaply create very large surfaces to interact with the
atmosphere. The surface coatings would also be reflective and produce useful
SRM effects.
There needs to be found a viable way to address the build-up of methane and
nitrous oxide which are powerful greenhouse gases.
You are premature to shut this discussion down. It is relevant.
From: Andrew Lockley [mailto:[email protected]]
Sent: 15 April 2019 15:12
To: David Sevier
Cc: geoengineering
Subject: Re: [geo] titanium dioxide
737 wing span 35m. Surface area therefore about 300m2. Approx 10k planes
flying. Maybe Same number grounded. Total area 6m m2 = 6 sq km = 15x the mall
of America.
This doesn't merit further discussion.
Andrew Lockley
On Mon, 15 Apr 2019, 14:49 David Sevier, <[email protected]>
wrote:
Planes are flying anyway. Titanium dioxide coating can be fractions of a micron
thick and therefore won’t add appreciable weigh. They fly in air that is cold
and which has greater amounts of UV than on the ground. The cold conditions may
favour desired reactions. They also fly quite fast, so the rate of interaction
with gas molecules is high. Whether this makes a difference or not will depend
on the reaction kinetics.
You have jumped to conclusions on this. I don’t know if there is something here
or not. Hence my questions.
Regarding roads and buildings: careful paint design is needed to maximize gas
to surface interaction. I am not convinced this would work for roads due to
wear and recent classifications of titanium dioxide as a cancer risk when a
dust. This is something that anyone thinking of using titanium dioxide for SRM
should bear in mind.
From: Andrew Lockley [mailto:[email protected]]
Sent: 15 April 2019 14:27
To: David Sevier
Cc: geoengineering
Subject: Re: [geo] titanium dioxide
Planes have a tiny surface area, big weight penalty and the air is very thin.
Doesn't pass a sniff test.
Using it in building and roadway surfaces is much more likely to work
Andrew
On Mon, 15 Apr 2019, 14:06 David Sevier, <[email protected]>
wrote:
I am wondering about whether titanium dioxide when electroplated as a film can
be used to decompose methane under ultraviolet light conditions. Can anyone
advice on this? I am seeking to compare this against polycrystalline titanium
dioxide which is known for this. I am also interested to understand if titanium
dioxide can be used to decompose nitrogen oxide and in particular nitrous oxide
under UV light conditions. Again, also to understand if electroplated films can
do this.
A possible application would be to coat planes with titanium oxides. There
might be some useful decomposition effects as they fly through the high
atmosphere under cold bright conditions.
Just to head off any misunderstandings, I am not saying in any way that this
will fully mitigate the effect of the emissions that flying creates but it
might just have a useful small effect to reduce them. Hence the questions.
David Sevier
Carbon Cycle Limited
248 Sutton Common Road
Sutton, Surrey SM3 9PW
England
Tel 44 (0)208 288 0199
www.carbon-cycle.co.uk <http://www.carbon-cycle.co.uk/>
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