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Full-Text Articles in Nanoscience and Nanotechnology
High-Resolution Thin-Film Device To Sense Texture By Touch, Ravi F. Saraf, Vivek Maheshwari
High-Resolution Thin-Film Device To Sense Texture By Touch, Ravi F. Saraf, Vivek Maheshwari
Papers in Nanotechnology
Touch (or tactile) sensors are gaining renewed interest as the level of sophistication in the application of minimum invasive surgery and humanoid robots increases. The spatial resolution of current large-area (greater than 1 cm2) tactile sensor lags by more than an order of magnitude compared with the human finger. By using metal and semi conducting nanoparticles, a 100-nm-thick, large-area thin-film device is self-assembled such that the change in current density through the film and the electroluminescent light intensity are linearly proportional to the local stress. A stress image is obtained by pressing a copper grid and a United …
High-Resolution Thin-Film Device To Sense Texture By Touch, Ravi F. Saraf, Vivek Maheshwari
High-Resolution Thin-Film Device To Sense Texture By Touch, Ravi F. Saraf, Vivek Maheshwari
Papers in Nanotechnology
Touch (or tactile) sensors are gaining renewed interest as the level of sophistication in the application of minimum invasive surgery and humanoid robots increases. The spatial resolution of current large-area (greater than 1 cm2) tactile sensor lags by more than an order of magnitude compared with the human finger. By using metal and semi conducting nanoparticles, a 100-nm-thick, large-area thin-film device is self-assembled such that the change in current density through the film and the electroluminescent light intensity are linearly proportional to the local stress. A stress image is obtained by pressing a copper grid and a United States 1-cent …
Self-Assembly Of Nanoparticles On Live Bacterium: An Avenue To Fabricate Electronic Devices, Vikas Berry, Ravi F. Saraf
Self-Assembly Of Nanoparticles On Live Bacterium: An Avenue To Fabricate Electronic Devices, Vikas Berry, Ravi F. Saraf
Papers in Nanotechnology
Recently, hybrid structures of microorganisms with inorganic nanoscale moieties have received great interest due to their potential in fabricating electronic systems. Electronic properties of metal nanoparticles, due to single electron transport of current[1], make them ideal material for nanodevices. Concomitantly, the nanostructure of microorganisms such as bacteria[2], viruses[3;4] and yeast[5] are attractive scaffolds for nanoparticle templating due to surface charge and biological affinities for specific molecules [2-7]. However, the key challenges in building hybrid devices are patterning nanostructures without destroying the biological construct of the microorganism and achieving active integration of biological response to the electrical transport in nanoparticle device. …
Self-Assembly Of Nanoparticles On Live Bacterium: An Avenue To Fabricate Electronic Devices, Ravi F. Saraf, Vikas Berry
Self-Assembly Of Nanoparticles On Live Bacterium: An Avenue To Fabricate Electronic Devices, Ravi F. Saraf, Vikas Berry
Papers in Nanotechnology
Recently, hybrid structures of microorganisms with inorganic nanoscale moieties have received great interest owing to their potential in fabricating electronic systems. The electronic properties of metal nanoparticles, as a result of the singleelectron transport of current,[1] make them ideal materials for nanodevices. Concomitantly, the nanostructure of microorganisms such as bacteria,[2] viruses,[3, 4] and yeast[5] are attractive scaffolds for the templating of metal nanoparticles through the interactions of the former with surface charges and the affinity of certain metals for specific biological molecules.[2–7] However, the key challenges in building hybrid devices are 1) to pattern nanostructures without destroying the biological construct …
Highly Selective, Electrically Conductive Monolayer Of Nanoparticles On Live Bacteria, V Berry, Rangaswamy S, Ravi F. Saraf
Highly Selective, Electrically Conductive Monolayer Of Nanoparticles On Live Bacteria, V Berry, Rangaswamy S, Ravi F. Saraf
Papers in Nanotechnology
Using specific peptide−bacteria affinity, a monolayer of 30 nm Au particle is selectively deposited on live bacteria surface to produce electrically conducting bridges spanning over 12 μm. The conductivity of the monolayer network is further improved by over 10-fold by “electric-field annealing”. The annealing process is explained by a percolation model.
Solid-Like Dynamics In Ultrathin Films Of Polymeric Liquids, Gaurav Singh, Ravi F. Saraf, Yves Martin
Solid-Like Dynamics In Ultrathin Films Of Polymeric Liquids, Gaurav Singh, Ravi F. Saraf, Yves Martin
Papers in Nanotechnology
In this letter, we demonstrate that, at mesoscales, nonferroelectric liquid films of polydimethyl siloxane. exhibit significant electrostriction not present in the corresponding bulk state. Remarkably, the observed electrostrictive effect has a response time ,20 ms in contrast to .5 ms recorded in conventional bulk ~ferroelectric polymers. The emergence of this fast electrostrictive strain in thin films is explained in terms of the amalgamation of two contrasting dynamic features—the influence of a highly mobile, viscous layer ~at the air/film interface. on the less-mobile, but fast responding, solid-like layer at the film/substrate interface. The effect is observed for thickness below 200 nm.
Manufacturing Of Novel Continuous Nanocrystalline Ceramic Nanofibers With Superior Mechanical Properties, Yuris A. Dzenis, Ruqiang Feng, Gustavo F. Larsen, Joseph Turner, Xiao Cheng Zeng
Manufacturing Of Novel Continuous Nanocrystalline Ceramic Nanofibers With Superior Mechanical Properties, Yuris A. Dzenis, Ruqiang Feng, Gustavo F. Larsen, Joseph Turner, Xiao Cheng Zeng
Papers in Nanotechnology
This project is in the area of nanomanufacturing of advanced nanostructured materials. Nanostructured materials (NSMs) with unusual and extreme properties will play a key role in many emerging technologies. However, manufacturing of NSMs with the desired properties is highly complex and currently is over-reliant on empirical data. In this project, a novel manufacturing process producing a new class of ceramic materials, i.e. continuous ceramic nanofibers, is addressed. The novel sol-gel electrospinning technique (patents pending), invented recently by two of the PI’s (Dzenis and Larsen), produces ceramic fibers of submicron diameters with potentially extreme thermomechanical properties. This technique is being analyzed …
Stability Of Order In Solvent-Annealed Block Copolymer Thin Films, Sanjun Niu, Ravi F. Saraf
Stability Of Order In Solvent-Annealed Block Copolymer Thin Films, Sanjun Niu, Ravi F. Saraf
Papers in Nanotechnology
ABSTRACT: One way to produce high order in a block copolymer thin film is by solution casting a thin film and slowly evaporating the solvent in a sealed vessel. Such a solvent-annealing process is a versatile method to produce a highly ordered thin film of a block copolymer. However, the ordered structure of the film degrades over time when stored under ambient conditions. Remarkably, this aging process occurs in mesoscale thin films of polystyrene-polyisoprene triblock copolymer where the monolayer of vitrified 15 nm diameter polystyrene cylinders sink in a 20 nm thick film at 22 °C. The transformation is studied …
Spontaneous Planarization Of Nanoscale Phase Separated Thin Film, Ravi F. Saraf, Sanjun Niu, Eric Stumb
Spontaneous Planarization Of Nanoscale Phase Separated Thin Film, Ravi F. Saraf, Sanjun Niu, Eric Stumb
Papers in Nanotechnology
Structure of complex fluid at mesoscales is influenced by interfacial effects. We describe the dynamic response in such films to sudden change in interfacial tension. In a self-assembled block copolymer film, the monolayer of 15 nm diam cylindrical discrete phases close to the surface commence to sink at an average rate of 0.16 nm/day in response to the interfacial tension change. Surprisingly, this spontaneous planarization occurs, even though the cylinders are covalently stitched to the matrix. A simple model explains the observed behavior. The observation may lead to approaches to tailor the structure of mesoscale thin films of complex fluids …