Showing posts from October, 2012

Nano grapheme, silicon based flexible transparent memory

Memory Devices Computers and many electronic gadgets usually rely on stored information which is mainly data which can be used to direct circuit actions. The digital information is stored in memory devices. The long-term nanotechnology prospects for memory devices include carbon-nanotube-based memory, molecular electronics and memristors based on resistive materials such as TiO2. Transparent memory Transparent electronic memory has an advantage in that it would be useful in integrated transparent electronics, but achieving such a transparency produces limits in material composition and hinders processing and device performance. Here we present a route to fabricate highly transparent memory using SiOx as the active material and indium tin oxide or graphene as the electrodes. The two-terminal, non-volatile resistive memory can also be configured in crossbar arrays on glass or flexible transparent platforms. The filamentary conduction in silicon channels generated in situ in the SiOx main

Self assembled targeted nanoparticles

Targeted nanoparticles are used for treating cancer by controlling from outside of the body using near-infrared (NIR) light as stimulus.  NIR is used because it is minimally absorbed by skin and tissue, has the ability to penetrate deep tissue in a non-invasive way and the energy from NIR light can be converted to heat by gold nanomaterials for effective thermal ablation of diseased tissue. Development Researchers from Brigham and Women's Hospital (BWH) researchers have used self assembled, multi-functional, NIR responsive gold nanorod to deliver a chemotherapy drug targeted to cancer cells for selective release of the drug. This is made possible in response to an external beam of light to create heat for synergistic thermo-chemo mediated anti-tumor efficacy. Researchers claim that the design of this gold nanorod and its self-assembly was inspired by nature and the ability of complimentary strands of DNA to hybridize on their own without imposing complicated chemical processes on t

Nanofibers and filaments for enhanced drug delivery

Drug Delivery Drugs are transported from their site of introduction to their molecular site of action after rapid filtration in the kidney and mix in the bloodstream and travel to target cells within tissues. At the tissue or cellular target, the drug must cross the plasma membrane, harsh environment within the cell and the multiple drug resistance mechanisms that pathological cells can develop. But nanomaterials are promising as drug or vaccine carriers to assist in navigating these barriers. Drug delivery vehicles Most of the nanoparticles based drug delivery vehicles are spheres, but cylindrical nanoparticles can survive for a long period in the blood stream to reach their intended target and penetrate the cell wall and deliver therapeutic payload where it is needed. North-western CCNE have developed self-assembling nanofibers that takes care of this requirement. Cylindrical vehicles To create tumor-inhibiting cylinders the researchers immersed peptide amphiphiles made using automa

Nanostructured electron cloak

Invisibility cloaks Invisibility cloaks are used to hide objects from electromagnetic waves and are made from metamaterials.  Metamaterials are artificial structures with special optical properties such as negative refractive indices arranged in such a way that incoming light waves can flow smoothly around the cloak and meet on the other side as if the cloak was not present. Electron cloak Electrons normally travel as waves over a certain distance before scattering destroys their wave phases over coherent transport length and the particles exhibit characteristic wave behaviour, such as amplitude superposition or interference. The principle of Invisibility cloaks can be applied to electrons made of core-shell nanoparticle structures embedded in a host semiconductor that does not disturb the flow of electrons. Researchers of Massachusetts Institute of Technology have developed a method to make an electron cloak, or an object that is invisible to electrons and made of a nanostructure tha