Publications
1.
Grinthal, Alison; Kang, Sung Hoon; Epstein, Alexander K.; Aizenberg, Michael; Khan, Mughees; Aizenberg, Joanna
Steering Nanofibers: An Integrative Approach to Bio-Inspired Fiber Fabrication and Assembly Journal Article
In: Nano Today, vol. 7, pp. 35-52, 2012, (Invited Review).
@article{Grinthal2012,
title = {Steering Nanofibers: An Integrative Approach to Bio-Inspired Fiber Fabrication and Assembly},
author = {Alison Grinthal and Sung Hoon Kang and Alexander K. Epstein and Michael Aizenberg and Mughees Khan and Joanna Aizenberg},
url = {http://www.sciencedirect.com/science/article/pii/S1748013211001411},
year = {2012},
date = {2012-02-01},
journal = {Nano Today},
volume = {7},
pages = {35-52},
abstract = {As seen throughout the natural world, nanoscale fibers exhibit a unique combination of mechanical and surface properties that enable them to wind and bend around each other into an immense diversity of complex forms. In this review, we discuss how this versatility can be harnessed to transform a simple array of anchored nanofibers into a variety of complex, hierarchically organized dynamic functional surfaces. We describe a set of recently developed benchtop techniques that provide a straightforward way to generate libraries of fibrous surfaces with a wide range of finely tuned, nearly arbitrary geometric, mechanical, material, and surface characteristics starting from a single master array. These simple systematic controls can be used to program the fibers to bundle together, twist around each other into chiral swirls, and assemble into patterned arrays of complex hierarchical architectures. The delicate balance between fiber elasticity and surface adhesion plays a critical role in determining the shape, chirality, and higher order of the assembled structures, as does the dynamic evolution of the geometric, mechanical, and surface parameters throughout the assembly process. Hierarchical assembly can also be programmed to run backwards, enabling a wide range of reversible, responsive behaviors to be encoded through rationally chosen surface chemistry. These strategies provide a foundation for designing a vast assortment of functional surfaces with anti-fouling, adhesive, optical, water and ice repellent, memory storage, microfluidic, capture and release, and many more capabilities with the structural and dynamic sophistication of their biological counterparts.},
note = {Invited Review},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
As seen throughout the natural world, nanoscale fibers exhibit a unique combination of mechanical and surface properties that enable them to wind and bend around each other into an immense diversity of complex forms. In this review, we discuss how this versatility can be harnessed to transform a simple array of anchored nanofibers into a variety of complex, hierarchically organized dynamic functional surfaces. We describe a set of recently developed benchtop techniques that provide a straightforward way to generate libraries of fibrous surfaces with a wide range of finely tuned, nearly arbitrary geometric, mechanical, material, and surface characteristics starting from a single master array. These simple systematic controls can be used to program the fibers to bundle together, twist around each other into chiral swirls, and assemble into patterned arrays of complex hierarchical architectures. The delicate balance between fiber elasticity and surface adhesion plays a critical role in determining the shape, chirality, and higher order of the assembled structures, as does the dynamic evolution of the geometric, mechanical, and surface parameters throughout the assembly process. Hierarchical assembly can also be programmed to run backwards, enabling a wide range of reversible, responsive behaviors to be encoded through rationally chosen surface chemistry. These strategies provide a foundation for designing a vast assortment of functional surfaces with anti-fouling, adhesive, optical, water and ice repellent, memory storage, microfluidic, capture and release, and many more capabilities with the structural and dynamic sophistication of their biological counterparts.
2.
Pokroy, Boaz; Kang, Sung Hoon; Mahadevan, L.; Aizenberg, Joanna
Self-Organization of a Mesoscale Bristle into Ordered, Hierarchical Helical Assemblies Journal Article
In: Science, vol. 323, pp. 237-240, 2009, (Highlighted in the issue, and various media including New York Times, NPR, Discovery, AAAS EurekAlert, C&EN, Technology Review, IEEE Spectrum, Science Daily, and New Scientist. ).
@article{Pokroy2009,
title = {Self-Organization of a Mesoscale Bristle into Ordered, Hierarchical Helical Assemblies},
author = {Boaz Pokroy and Sung Hoon Kang and L. Mahadevan and Joanna Aizenberg
},
url = {http://www.sciencemag.org/content/323/5911/237.short},
year = {2009},
date = {2009-01-09},
journal = {Science},
volume = {323},
pages = {237-240},
abstract = {Mesoscale hierarchical helical structures with diverse functions are abundant in nature. Here we show how spontaneous helicity can be induced in a synthetic polymeric nanobristle assembling in an evaporating liquid. We use a simple theoretical model to characterize the geometry, stiffness, and surface properties of the pillars that favor the adhesive self-organization of bundles with pillars wound around each other. The process can be controlled to yield highly ordered helical clusters with a unique structural hierarchy that arises from the sequential assembly of self-similar coiled building blocks over multiple length scales. We demonstrate their function in the context of self-assembly into previously unseen structures with uniform, periodic patterns and controlled handedness and as an efficient particle-trapping and adhesive system. },
note = {Highlighted in the issue, and various media including New York Times, NPR, Discovery, AAAS EurekAlert, C&EN, Technology Review, IEEE Spectrum, Science Daily, and New Scientist. },
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Mesoscale hierarchical helical structures with diverse functions are abundant in nature. Here we show how spontaneous helicity can be induced in a synthetic polymeric nanobristle assembling in an evaporating liquid. We use a simple theoretical model to characterize the geometry, stiffness, and surface properties of the pillars that favor the adhesive self-organization of bundles with pillars wound around each other. The process can be controlled to yield highly ordered helical clusters with a unique structural hierarchy that arises from the sequential assembly of self-similar coiled building blocks over multiple length scales. We demonstrate their function in the context of self-assembly into previously unseen structures with uniform, periodic patterns and controlled handedness and as an efficient particle-trapping and adhesive system.
Note: Send e-mail to Prof. Kang at [email protected] if you need a pdf file of the papers below.
2012
Grinthal, Alison; Kang, Sung Hoon; Epstein, Alexander K.; Aizenberg, Michael; Khan, Mughees; Aizenberg, Joanna
Steering Nanofibers: An Integrative Approach to Bio-Inspired Fiber Fabrication and Assembly Journal Article
In: Nano Today, vol. 7, pp. 35-52, 2012, (Invited Review).
Abstract | Links | BibTeX | Tags: Assembly, Bio-Inspired, bio-inspired science and engineering, Chemistry, Fabrication, Geometry, Hierarchical, Mechanics, Nanofiber, Symmetry
@article{Grinthal2012,
title = {Steering Nanofibers: An Integrative Approach to Bio-Inspired Fiber Fabrication and Assembly},
author = {Alison Grinthal and Sung Hoon Kang and Alexander K. Epstein and Michael Aizenberg and Mughees Khan and Joanna Aizenberg},
url = {http://www.sciencedirect.com/science/article/pii/S1748013211001411},
year = {2012},
date = {2012-02-01},
journal = {Nano Today},
volume = {7},
pages = {35-52},
abstract = {As seen throughout the natural world, nanoscale fibers exhibit a unique combination of mechanical and surface properties that enable them to wind and bend around each other into an immense diversity of complex forms. In this review, we discuss how this versatility can be harnessed to transform a simple array of anchored nanofibers into a variety of complex, hierarchically organized dynamic functional surfaces. We describe a set of recently developed benchtop techniques that provide a straightforward way to generate libraries of fibrous surfaces with a wide range of finely tuned, nearly arbitrary geometric, mechanical, material, and surface characteristics starting from a single master array. These simple systematic controls can be used to program the fibers to bundle together, twist around each other into chiral swirls, and assemble into patterned arrays of complex hierarchical architectures. The delicate balance between fiber elasticity and surface adhesion plays a critical role in determining the shape, chirality, and higher order of the assembled structures, as does the dynamic evolution of the geometric, mechanical, and surface parameters throughout the assembly process. Hierarchical assembly can also be programmed to run backwards, enabling a wide range of reversible, responsive behaviors to be encoded through rationally chosen surface chemistry. These strategies provide a foundation for designing a vast assortment of functional surfaces with anti-fouling, adhesive, optical, water and ice repellent, memory storage, microfluidic, capture and release, and many more capabilities with the structural and dynamic sophistication of their biological counterparts.},
note = {Invited Review},
keywords = {Assembly, Bio-Inspired, bio-inspired science and engineering, Chemistry, Fabrication, Geometry, Hierarchical, Mechanics, Nanofiber, Symmetry},
pubstate = {published},
tppubtype = {article}
}
As seen throughout the natural world, nanoscale fibers exhibit a unique combination of mechanical and surface properties that enable them to wind and bend around each other into an immense diversity of complex forms. In this review, we discuss how this versatility can be harnessed to transform a simple array of anchored nanofibers into a variety of complex, hierarchically organized dynamic functional surfaces. We describe a set of recently developed benchtop techniques that provide a straightforward way to generate libraries of fibrous surfaces with a wide range of finely tuned, nearly arbitrary geometric, mechanical, material, and surface characteristics starting from a single master array. These simple systematic controls can be used to program the fibers to bundle together, twist around each other into chiral swirls, and assemble into patterned arrays of complex hierarchical architectures. The delicate balance between fiber elasticity and surface adhesion plays a critical role in determining the shape, chirality, and higher order of the assembled structures, as does the dynamic evolution of the geometric, mechanical, and surface parameters throughout the assembly process. Hierarchical assembly can also be programmed to run backwards, enabling a wide range of reversible, responsive behaviors to be encoded through rationally chosen surface chemistry. These strategies provide a foundation for designing a vast assortment of functional surfaces with anti-fouling, adhesive, optical, water and ice repellent, memory storage, microfluidic, capture and release, and many more capabilities with the structural and dynamic sophistication of their biological counterparts.
2009
Pokroy, Boaz; Kang, Sung Hoon; Mahadevan, L.; Aizenberg, Joanna
Self-Organization of a Mesoscale Bristle into Ordered, Hierarchical Helical Assemblies Journal Article
In: Science, vol. 323, pp. 237-240, 2009, (Highlighted in the issue, and various media including New York Times, NPR, Discovery, AAAS EurekAlert, C&EN, Technology Review, IEEE Spectrum, Science Daily, and New Scientist. ).
Abstract | Links | BibTeX | Tags: bio-inspired science and engineering, Helical, Hierarchical, Mesoscale, Nanopillar, Order, Self-Organization
@article{Pokroy2009,
title = {Self-Organization of a Mesoscale Bristle into Ordered, Hierarchical Helical Assemblies},
author = {Boaz Pokroy and Sung Hoon Kang and L. Mahadevan and Joanna Aizenberg
},
url = {http://www.sciencemag.org/content/323/5911/237.short},
year = {2009},
date = {2009-01-09},
journal = {Science},
volume = {323},
pages = {237-240},
abstract = {Mesoscale hierarchical helical structures with diverse functions are abundant in nature. Here we show how spontaneous helicity can be induced in a synthetic polymeric nanobristle assembling in an evaporating liquid. We use a simple theoretical model to characterize the geometry, stiffness, and surface properties of the pillars that favor the adhesive self-organization of bundles with pillars wound around each other. The process can be controlled to yield highly ordered helical clusters with a unique structural hierarchy that arises from the sequential assembly of self-similar coiled building blocks over multiple length scales. We demonstrate their function in the context of self-assembly into previously unseen structures with uniform, periodic patterns and controlled handedness and as an efficient particle-trapping and adhesive system. },
note = {Highlighted in the issue, and various media including New York Times, NPR, Discovery, AAAS EurekAlert, C&EN, Technology Review, IEEE Spectrum, Science Daily, and New Scientist. },
keywords = {bio-inspired science and engineering, Helical, Hierarchical, Mesoscale, Nanopillar, Order, Self-Organization},
pubstate = {published},
tppubtype = {article}
}
Mesoscale hierarchical helical structures with diverse functions are abundant in nature. Here we show how spontaneous helicity can be induced in a synthetic polymeric nanobristle assembling in an evaporating liquid. We use a simple theoretical model to characterize the geometry, stiffness, and surface properties of the pillars that favor the adhesive self-organization of bundles with pillars wound around each other. The process can be controlled to yield highly ordered helical clusters with a unique structural hierarchy that arises from the sequential assembly of self-similar coiled building blocks over multiple length scales. We demonstrate their function in the context of self-assembly into previously unseen structures with uniform, periodic patterns and controlled handedness and as an efficient particle-trapping and adhesive system.