#Sandcastles inspire new nanoparticle binding technique Abstract:""Nanocapillary-mediated magnetic assembly of nanoparticles into ultraflexible filaments and reconfigurable networks"Authors: Bhuvensh Bharti and Orlin D. Velev, North carolina State university; Anne-Laure Fameau, National Institute of French Agricultural research; Michael Rubenstein, University of North carolina, Chapel hill Published: Aug 3, 2015, online in Nature Materials DOI: 10.1038/nmat4364abstract: The fabrication of multifunctional materials with tunable structure and properties requires programmed binding of their building blocks. For example, particles organized in long-ranged structures by external fields can be bound permanently into stiff chains through electrostatic or Van der waals attraction, or into flexible chains through soft molecular linkers such as surface-grafted DNA or polymers. Here, we show that capillarity-mediated binding between magnetic nanoparticles coated with a liquid lipid shell can be used for the assembly of ultraflexible microfilaments and network structures. These filaments can be regenerated magnetically on mechanical damage, owing to the fluidity of the capillary bridges between nanoparticles and their reversible binding on contact. Nanocapillary forces offer opportunities for assembling dynamically reconfigurable multifunctional materials that could find applications as micromanipulators, microbots with ultrasoft joints, or magnetically self-repairing gels. If you want to form very flexible chains of nanoparticles in liquid in order to build tiny robots with flexible joints or make magnetically self-healing gels, you need to revert to childhood and think about sandcastles. In a paper published this week in Nature Materials, researchers from North carolina State university and the University of North carolina-Chapel hill show that magnetic nanoparticles encased in oily liquid shells can bind together in water, much like sand particles mixed with the right amount of water can form sandcastles.""Because oil and water don't mix, the oil wets the particles and creates capillary bridges between them so that the particles stick together on contact, "said Orlin Velev, INVISTA Professor of Chemical and Biomolecular engineering at NC State and the corresponding author of the paper.""We then add a magnetic field to arrange the nanoparticle chains and provide directionality, "said Bhuvnesh Bharti, research assistant professor of chemical and biomolecular engineering at NC State and first author of the paper. Chilling the oil is like drying the sandcastle. Reducing the temperature from 45 degrees Celsius to 15 degrees Celsius freezes the oil and makes the bridges fragile, leading to breaking and fragmentation of the nanoparticle chains. Yet the broken nanoparticles chains will reform if the temperature is raised, the oil liquefies and an external magnetic field is applied to the particles.""In other words, this material is temperature responsive, and these soft and flexible structures can be pulled apart and rearranged,"Velev said.""And there are no other chemicals necessary.""""This research was the result of collaboration initiated by the NSF Materials Research Science and Engineering Center that facilitates interactions between Triangle universities.""said Michael Rubinstein, John P. Barker Distinguished Professor of Chemistry at UNC and one of the co-authors of the paper.#####The paper is authored also co by Anne-Laure Fameau, a visiting researcher from INRA, France. The research is funded by the National Science Foundation through the Triangle MRSEC on Programmable Soft Matter and the U s army Research Office.#####For more information, please click herecontacts: Dr. Orlin Velevwriteemail('ncsu. edu','odvelev';'919-513-4318copyright North carolina State Universityissuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content. Bookmark: Download paper: News and information Molecular trick alters rules of attraction for nonmagnetic metals August 5th, 2015two spin liquids square off in an iron-based superconductor: Changes in short-range, transient order in competing liquid-like phases precede onset of superconductivity August 5th, 2015yolks and shells improve rechargeable batteries: Aluminum could give a big boost to capacity and power of lithium-ion batteries August 5th, 2015arrowhead to Present at Jefferies 2015 Hepatitis b Summit August 5th, 2015robotics UT Dallas nanotechnology research leads to super-elastic conducting fibers July 24th, 2015rare form: Novel structures built from DNA emerge July 20th, 2015ieee ROBIO 2015 Call for Papers: 2015 IEEE International Conference on Robotics and Biomimetics-December 6-9, 2015, Zhuhai, China July 19th, 2015groundbreaking research to help control liquids at micro and nano scales July 3rd, 2015govt. -Legislation/Regulation/Funding/Policy Molecular trick alters rules of attraction for nonmagnetic metals August 5th, 2015two spin liquids square off in an iron-based superconductor: Changes in short-range, transient order in competing liquid-like phases precede onset of superconductivity August 5th, 2015atomic view of microtubules: Berkeley Lab researchers achieve record 3. 5 angstroms resolution and visualize action of a major microtubule-regulating protein August 4th, 2015nanoparticles used to breach mucus barrier in lungs: Proof-of-concept study conducted in mice a key step toward better treatments for lung diseases August 3rd, 2015molecular Nanotechnology New computer model could explain how simple molecules took first step toward life: Two Brookhaven researchers developed theoretical model to explain the origins of self-replicating molecules July 28th, 2015rare form: Novel structures built from DNA emerge July 20th, 2015groundbreaking research to help control liquids at micro and nano scales July 3rd, 2015$8. 5m Grant For Developing Nano Printing Technology: 4-D printing to advance chemistry, materials sciences and defense capabilities June 18th, 2015discoveries Molecular trick alters rules of attraction for nonmagnetic metals August 5th, 2015two spin liquids square off in an iron-based superconductor: Changes in short-range, transient order in competing liquid-like phases precede onset of superconductivity August 5th, 2015yolks and shells improve rechargeable batteries: Aluminum could give a big boost to capacity and power of lithium-ion batteries August 5th, 2015engineering a better'Do: Purdue researchers are learning how August 4th, 2015materials/Metamaterials Molecular trick alters rules of attraction for nonmagnetic metals August 5th, 2015yolks and shells improve rechargeable batteries: Aluminum could give a big boost to capacity and power of lithium-ion batteries August 5th, 2015engineering a better'Do: Purdue researchers are learning how August 4th, 2015thin films offer promise for ferroelectric devices: Researchers at Tokyo Institute of technology demystify the ferroelectric properties observed in hafnium-oxide-based thin films, revealing a potentially useful device material August 3rd, 2015announcements Molecular trick alters rules of attraction for nonmagnetic metals August 5th, 2015two spin liquids square off in an iron-based superconductor: Changes in short-range, transient order in competing liquid-like phases precede onset of superconductivity August 5th, 2015yolks and shells improve rechargeable batteries: Aluminum could give a big boost to capacity and power of lithium-ion batteries August 5th, 2015arrowhead to Present at Jefferies 2015 Hepatitis b Summit August 5th, 2015interviews/Book reviews/Essays/Reports/Podcasts/Journals/White papers Molecular trick alters rules of attraction for nonmagnetic metals August 5th, 2015two spin liquids square off in an iron-based superconductor: Changes in short-range, transient order in competing liquid-like phases precede onset of superconductivity August 5th, 2015yolks and shells improve rechargeable batteries: Aluminum could give a big boost to capacity and power of lithium-ion batteries August 5th, 2015nanoparticles Give Antibacterial Properties to Machine-Woven Carpets August 4th, 2015military Self-assembling, biomimetic membranes may aid water filtration August 1st, 2015take a trip through the brain July 30th, 2015sol-gel capacitor dielectric offers record-high energy storage July 30th, 2015researchers predict material with record-setting melting point July 27th, 201 0
Overtext Web Module V3.0 Alpha
Copyright Semantic-Knowledge, 1994-2011