Drs. Seitz and Evans (cc Andrew, John Nissen and list):
1. I take it from Russell’s tone that this is quite big news. Is this
a correct surmise?
2. Could you (anyone) comment on Andrew’s questions (below),
especially on the last “effect on marine life”.
3. How likely is this to be workable soon in the Arctic summer - with
the intent to prevent methane release (the main list issue for John Nissen and
AMEG).
4. Being behind a paywall, I don’t know whether this article (and
others at http://www.ucl.ac.uk/chemistry/staff/academic_pages/julian_evans)
covers economics. Anything that can be said now on costs? Might they have
just come down by the several orders of magnitude that Russell has cited?
Ron
On Mar 17, 2015, at 11:19 PM, Russell Seitz <russellse...@gmail.com> wrote:
> The reflecivity gain reported in Royal Society of Chemistry Advances is
> quite phenomenal-- about 10 times the albedo of still water, and the bubble
> lifetime is two orders of magnitude greater than the longest-lived marine
> microbubbles Johnson and Cooke noted in their 1981 Science paper
>
> On Tuesday, March 17, 2015 at 9:27:55 PM UTC-4, andrewjlockley wrote:
> Poster's note : interesting concept, but major questions remain regarding
> wave action, biodegradation, and the effect on marine life.
>
> http://pubs.rsc.org/en/content/articlelanding/2014/ra/c4ra08714c
>
> Long-term stabilization of reflective foams in sea water
>
> Alex Aziz, Helen C. Hailes, John M. Ward and Julian R. G. Evans
> RSC Adv., 2014,4, 53028-53036
> DOI: 10.1039/C4RA08714C
>
> Abstract
>
> This work explores the challenge of making persistent foams in salt water to
> provide high reflectance. While stable foam is essential in the food industry
> and in fire fighting, this is the first work aimed at combining foam
> persistence with reflectance. One application is the use of oceanic foams to
> increase planetary albedo: extending foam lifetime moderates the energy
> required to maintain large areas of ‘ocean mirror’. Two compositions to
> produce such foams in seawater are described. The first is based on high
> methyl ester pectin-type A gelatin complexes which produced foams with a
> reflectance of 0.5. The second produces stable foams using cellulose ethers
> and iota carrageenan gelling agents. These foams gelled in the presence of
> sea water to give measured reflectance of 0.65–0.75. Both had lifetimes,
> without wave action, beyond three months at which point the experiment ended.
> In contrast, single protein species such as gelatin B, whey protein isolate
> and albumin produced short-lived foams. Foam stability was measured by
> recording liquid drainage and foam height as a function of time. In the event
> that climate interventions are needed, such additives would be appropriate
> for nutrient-deficient ocean regions that support low levels of marine life.
>
>
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