Tag Archives: William A. Goddard III

New York University/Caltech grant is part of the NSF’s Origami Design for Integration of Self-assembling Systems for Engineering Innovation (ODISSEI) program

The US National Science Foundation (NSF) has an origami program,  Origami Design for Integration of Self-assembling Systems for Engineering Innovation (ODISSEI), which recently announced a $2M grant to New York University (NYU) and the California Institute of Technology (Caltech) to create new nanomaterials according to an Aug. 6, 2013 news item on Nanowerk,

The National Science Foundation (NSF) has awarded New York University researchers and their colleagues at the California Institute of Technology (Caltech) a $2 million grant to develop cutting-edge nanomaterials that hold promise for improving the manufacturing of advanced materials, biofuels, and other industrial products.

Under the grant, the scientists will develop biomimetic materials with revolutionary properties—these molecules will self-replicate, evolve, and adopt three-dimensional structures a billionth of a meter in size by combining DNA-guided self-assembly with the centuries-old art of origami folding.

The Aug. 5, 2013 NYU press release, which originated the news item,  provides details about the researchers and the project,

The four-year grant is part of the NSF’s Origami Design for Integration of Self-assembling Systems for Engineering Innovation (ODISSEI) program and includes NYU Chemistry Professors Nadrian Seeman and James Canary and NYU Physics Professor Paul Chaikin. They will team up with Caltech’s William A. Goddard, III and Si-ping Han.

Others involved in the project are molecular biologists John Rossi and Lisa Scherer of City of Hope Medical Center and mathematicians Joanna Ellis-Monaghan and Greta Pangborn of Saint Michael’s College in Vermont.

The work will build upon recent breakthroughs in the field of structural DNA nanotechnology, which Seeman founded more than three decades ago and is now pursued by laboratories across the globe. His creations allow him to arrange pieces and form specific molecules with precision—similar to the way a robotic automobile factory can be told what kind of car to make.

Previously, Seeman has created three-dimensional DNA structures, a scientific advance bridging the molecular world to the world where we live. To do this, he and his colleagues created DNA crystals by making synthetic sequences of DNA that have the ability to self-assemble into a series of 3D triangle-like motifs. The creation of the crystals was dependent on putting “sticky ends”—small cohesive sequences on each end of the motif—that attach to other molecules and place them in a set order and orientation. The make-up of these sticky ends allows the motifs to attach to each other in a programmed fashion.

Recently, the Seeman and Chaikin labs teamed up to develop artificial structures that can self-replicate, a process that has the potential to yield new types of materials. In the natural world, self-replication is ubiquitous in all living entities, but artificial self-replication had previously been elusive. Their work marked the first steps toward a general process for self-replication of a wide variety of arbitrarily designed “seeds”. The seeds are made from DNA tile motifs that serve as letters arranged to spell out a particular word. The replication process preserves the letter sequence and the shape of the seed and hence the information required to produce further generations. Self-replication enables the evolution of molecules to optimize particular properties via selection processes.

Under the NSF grant, the researchers will aim to take these innovations to the next level: the creation of self-replicating 3D arrays. To do so, the collaborators will aim to fold replicating 1D and 2D arrays into 3D shapes in a manner similar to paper origami—a complex and delicate process.

In meeting this challenge, they will adopt tools from graph theory and origami mathematics to develop algorithms to direct self-assembling DNA nanostructures and their origami folds. The mathematical component of the endeavor will be supplemented by the artistic expertise of Portland, Ore.-based sculptor Julian Voss-Andreae, who will advise the team on issues related to design and will use his skills to develop life-size physical models of the nanoscopic structures the scientists are seeking to build. [emphasis mine]

I wasn’t expecting to see a sculptor included in the team and I wonder if there might be plans to use his sculptures not only as models but also in exhibitions and art shows to fulfill any science outreach requirements that the NSF might have for its grantees.

I did a little further digging into the NSF’s ‘origami’ program and found this webpage explaining that ‘origami’ is part of a still larger program,

The Emerging Frontiers in Research and Innovation (EFRI) office awarded 15 grants in FY 2012, including the following 8 on the topic of Origami Design for Integration of Self-assembling Systems for Engineering Innovation (ODISSEI): …

As there wasn’t any information about grants for FY 2013, I gather they haven’t had time to update the page or add any recent news releases to the website.

Love, hate, and the whole damn thing affect batteries, semiconductors, and electronic memory

A Jan. 24, 2013 news item on ScienceDaily features love triumphing over hate where tetracationic rings are concerned,

Northwestern University graduate student Jonathan Barnes had a hunch for creating an exotic new chemical compound, and his idea that the force of love is stronger than hate proved correct. He and his colleagues are the first to permanently interlock two identical tetracationic rings that normally are repelled by each other. Many experts had said it couldn’t be done.

On the surface, the rings hate each other because each carries four positive charges (making them tetracationic). But Barnes discovered by introducing radicals (unpaired electrons) onto the scene, the researchers could create a love-hate relationship in which love triumphs.

The Jan. 24, 2013 Northwestern University news release by Megan Fellman, which originated the news item, probes into the nature of the problem and its solution (Note: A link has been removed),

Unpaired electrons want to pair up and be stable, and it turns out the attraction of one ring’s single electrons to the other ring’s single electrons is stronger than the repelling forces.

The process links the rings not by a chemical bond but by a mechanical bond, which, once in place, cannot easily be torn asunder.

The study detailing this new class of stable organic radicals will be published Jan. 25 [2013] by the journal Science.

“It’s not that people have tried and failed to put these two rings together — they just didn’t think it was possible,” said Sir Fraser Stoddart, a senior author of the paper. “Now this molecule has been made. I cannot overemphasize Jonathan’s achievement — it is really outside the box. Now we are excited to see where this new chemistry leads us.”

The rings repel each other like the positive poles of two magnets. Barnes saw an opportunity where he thought he could tweak the chemistry by using radicals to overcome the hate between the two rings.

“We made these rings communicate and love each other under certain conditions, and once they were mechanically interlocked, the bond could not be broken,” Barnes said.

Barnes’ first strategy — adding electrons to temporarily reduce the charge and bring the two rings together — worked the first time he tried it. He, Stoddart and their colleagues started with a full ring and a half ring that they then closed up around the first ring (using some simple chemistry), creating the mechanical bond.

When the compound is oxidized and electrons lost, the strong positive forces come roaring back — “It’s hate on all the time,” Barnes said — but then it is too late for the rings to be parted. “That’s the beauty of this system,” he added.

Most organic radicals possess short lifetimes, but this unusual radical compound is stable in air and water. The compound tucks the electrons away inside the structure so they can’t react with anything in the environment. The tight mechanical bond endures despite the unfavorable electrostatic interactions.

The two interlocked rings house an immense amount of charge in a mere cubic nanometer of space. The compound, a homo[2]catenane, can adopt one of six oxidation states and can accept up to eight electrons in total.

“Anything that accepts this many electrons has possibilities for batteries,” Barnes said.

“Applications beckon,” Stoddart agreed. “Now we need to spend more time with materials scientists and people who make devices to see how this amazing compound can be used.”

For anyone interested in the details of the work, here’s a citation and link to the paper published in Science,

A Radically Configurable Six-State Compound by Jonathan C. Barnes, Albert C. Fahrenbach, Dennis Cao, Scott M. Dyar, Marco Frasconi, Marc A. Giesener, Diego Benítez, Ekaterina Tkatchouk, Oleksandr Chernyashevskyy, Weon Ho Shin, Hao Li, Srinivasan Sampath, Charlotte L. Stern, Amy A. Sarjeant, Karel J. Hartlieb, Zhichang Liu, Raanan Carmieli, Youssry Y. Botros, Jang Wook Choi, Alexandra M. Z. Slawin, John B. Ketterson, Michael R. Wasielewski, William A. Goddard III, J. Fraser Stoddart. Science 25 January 2013: Vol. 339 no. 6118 pp. 429-433 DOI: 10.1126/science.1228429

This is paper is behind a paywall.