10:05
TEDGlobal 2009

Rachel Armstrong: Architecture that repairs itself?

Filmed:

Venice is sinking. To save it, Rachel Armstrong says we need to outgrow architecture made of inert materials and, well, make architecture that grows itself. She proposes a not-quite-alive material that does its own repairs and sequesters carbon, too.

- Applied scientist, innovator
TED Fellow Rachel Armstrong is a sustainability innovator who creates new materials that possess some of the properties of living systems, and can be manipulated to "grow" architecture. Full bio

All buildings today have something in common.
00:15
They're made using Victorian technologies.
00:19
This involves blueprints,
00:22
industrial manufacturing
00:25
and construction using teams of workers.
00:27
All of this effort results in an inert object.
00:30
And that means that there is a one-way transfer of energy
00:33
from our environment into our homes and cities.
00:36
This is not sustainable.
00:40
I believe that the only way that it is possible for us
00:42
to construct genuinely sustainable homes and cities
00:45
is by connecting them to nature,
00:48
not insulating them from it.
00:50
Now, in order to do this, we need the right kind of language.
00:53
Living systems are in constant conversation
00:57
with the natural world,
00:59
through sets of chemical reactions called metabolism.
01:01
And this is the conversion of one group of substances
01:05
into another, either through
01:08
the production or the absorption of energy.
01:10
And this is the way in which living materials
01:13
make the most of their local resources
01:15
in a sustainable way.
01:18
So, I'm interested in the use of
01:21
metabolic materials for the practice of architecture.
01:23
But they don't exist. So I'm having to make them.
01:28
I'm working with architect Neil Spiller
01:30
at the Bartlett School of Architecture,
01:32
and we're collaborating with international scientists
01:34
in order to generate these new materials
01:36
from a bottom up approach.
01:38
That means we're generating them from scratch.
01:40
One of our collaborators is chemist Martin Hanczyc,
01:42
and he's really interested in the transition from
01:46
inert to living matter.
01:49
Now, that's exactly the kind of process that I'm interested in,
01:51
when we're thinking about sustainable materials.
01:54
So, Martin, he works with a system called the protocell.
01:56
Now all this is -- and it's magic --
02:01
is a little fatty bag. And it's got a chemical battery in it.
02:04
And it has no DNA.
02:07
This little bag is able to conduct itself
02:10
in a way that can only be described as living.
02:12
It is able to move around its environment.
02:15
It can follow chemical gradients.
02:18
It can undergo complex reactions,
02:20
some of which are happily architectural.
02:23
So here we are. These are protocells,
02:27
patterning their environment.
02:29
We don't know how they do that yet.
02:31
Here, this is a protocell, and it's vigorously shedding this skin.
02:34
Now, this looks like a chemical kind of birth.
02:38
This is a violent process.
02:40
Here, we've got a protocell to extract carbon dioxide
02:43
out of the atmosphere
02:46
and turn it into carbonate.
02:48
And that's the shell around that globular fat.
02:50
They are quite brittle. So you've only got a part of one there.
02:52
So what we're trying to do is, we're trying to push these technologies
02:55
towards creating bottom-up construction approaches
02:58
for architecture,
03:00
which contrast the current, Victorian, top-down methods
03:02
which impose structure upon matter.
03:05
That can't be energetically sensible.
03:08
So, bottom-up materials
03:11
actually exist today.
03:13
They've been in use, in architecture, since ancient times.
03:15
If you walk around the city of Oxford, where we are today,
03:18
and have a look at the brickwork,
03:21
which I've enjoyed doing in the last couple of days,
03:23
you'll actually see that a lot of it is made of limestone.
03:25
And if you look even closer,
03:27
you'll see, in that limestone, there are little shells
03:29
and little skeletons that are piled upon each other.
03:31
And then they are fossilized over millions of years.
03:34
Now a block of limestone, in itself,
03:37
isn't particularly that interesting.
03:39
It looks beautiful.
03:42
But imagine what the properties of this limestone block might be
03:44
if the surfaces were actually
03:48
in conversation with the atmosphere.
03:50
Maybe they could extract carbon dioxide.
03:53
Would it give this block of limestone new properties?
03:56
Well, most likely it would. It might be able to grow.
03:59
It might be able to self-repair, and even respond
04:02
to dramatic changes
04:04
in the immediate environment.
04:06
So, architects are never happy
04:08
with just one block of an interesting material.
04:11
They think big. Okay?
04:14
So when we think about scaling up metabolic materials,
04:16
we can start thinking about ecological interventions
04:19
like repair of atolls,
04:21
or reclamation of parts of a city
04:23
that are damaged by water.
04:26
So, one of these examples
04:28
would of course be the historic city of Venice.
04:30
Now, Venice, as you know, has a tempestuous relationship with the sea,
04:33
and is built upon wooden piles.
04:37
So we've devised a way by which it may be possible
04:39
for the protocell technology that we're working with
04:42
to sustainably reclaim Venice.
04:44
And architect Christian Kerrigan
04:47
has come up with a series of designs that show us
04:49
how it may be possible to actually grow a limestone reef
04:51
underneath the city.
04:54
So, here is the technology we have today.
04:56
This is our protocell technology,
04:59
effectively making a shell, like its limestone forefathers,
05:01
and depositing it in a very complex environment,
05:05
against natural materials.
05:08
We're looking at crystal lattices to see the bonding process in this.
05:10
Now, this is the very interesting part.
05:13
We don't just want limestone dumped everywhere in all the pretty canals.
05:15
What we need it to do is to be
05:18
creatively crafted around the wooden piles.
05:20
So, you can see from these diagrams that the protocell is actually
05:24
moving away from the light,
05:26
toward the dark foundations.
05:28
We've observed this in the laboratory.
05:30
The protocells can actually move away from the light.
05:32
They can actually also move towards the light. You have to just choose your species.
05:35
So that these don't just exist as one entity,
05:38
we kind of chemically engineer them.
05:40
And so here the protocells are depositing their limestone
05:43
very specifically, around the foundations of Venice,
05:46
effectively petrifying it.
05:49
Now, this isn't going to happen tomorrow. It's going to take a while.
05:51
It's going to take years of tuning and monitoring this technology
05:55
in order for us to become ready
05:59
to test it out in a case-by-case basis
06:01
on the most damaged and stressed buildings within the city of Venice.
06:03
But gradually, as the buildings are repaired,
06:06
we will see the accretion of a limestone reef beneath the city.
06:09
An accretion itself is a huge sink of carbon dioxide.
06:12
Also it will attract the local marine ecology,
06:16
who will find their own ecological niches within this architecture.
06:19
So, this is really interesting. Now we have an architecture
06:23
that connects a city to the natural world
06:26
in a very direct and immediate way.
06:29
But perhaps the most exciting thing about it
06:31
is that the driver of this technology is available everywhere.
06:34
This is terrestrial chemistry. We've all got it,
06:37
which means that this technology is just as appropriate
06:40
for developing countries as it is
06:43
for First World countries.
06:45
So, in summary, I'm generating metabolic materials
06:47
as a counterpoise to Victorian technologies,
06:50
and building architectures from a bottom-up approach.
06:53
Secondly, these metabolic materials
06:56
have some of the properties of living systems,
06:58
which means they can perform in similar ways.
07:00
They can expect to have a lot of forms and functions
07:03
within the practice of architecture.
07:06
And finally, an observer in the future
07:08
marveling at a beautiful structure in the environment
07:11
may find it almost impossible to tell
07:14
whether this structure
07:17
has been created by a natural process
07:19
or an artificial one.
07:21
Thank you.
07:23
(Applause)
07:25

▲Back to top

About the Speaker:

Rachel Armstrong - Applied scientist, innovator
TED Fellow Rachel Armstrong is a sustainability innovator who creates new materials that possess some of the properties of living systems, and can be manipulated to "grow" architecture.

Why you should listen

Rachel Armstrong innovates and designs sustainable solutions for the built and natural environment using advanced new technologies such as, Synthetic Biology – the rational engineering of living systems - and smart chemistry. Her research prompts a reevaluation of how we think about our homes and cities and raises questions about sustainable development of the built environment. She creates open innovation platforms for academia and industry to address environmental challenges such as carbon capture & recycling, smart ‘living’ materials and sustainable design.

Her award winning research underpins her bold approach to the way that she challenges perceptions, presumptions and established principles related to scientific concepts and the building blocks of life and society. She embodies and promotes new transferrable ways of thinking ‘outside of the box’ and enables others to also develop innovative environmental solutions. Her innovative approaches are outlined in her forthcoming TED Book on Living Architecture.

Watch Rachel Armstrong's TED Fellows talk, "Creating Carbon-Negative Architecture" >>

More profile about the speaker
Rachel Armstrong | Speaker | TED.com