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Post by aqt on Jan 24, 2010 16:10:19 GMT -5
www.nanowerk.com/spotlight/spotid=2403.php"Our work may challenges us to design and build biodevices with even more sophisticated transport characteristics, for instance, one that contains the equivalent of an npn or pnp junction and thus an amplifier, or a pnpn set up that acts as a thyristor to allow control of huge currents" Eisenberg explains to Nanowerk. "Because these devices include ion selectivity, which we know how to manipulate, chances are we should be able to selectively amplify currents carried by individual chemical species. The implications are staggering as they were when the first electronic diode was converted into an amplifying triode." "We took the approach, where amino acids residues in the selectivity filter were replaced by others, one step further by creating a second selectivity filter with a net charge of comparable magnitude but opposite sign than that of the original, first selectivity filter" Dr. Henk Miedema explains to Nanowerk. "The two filters, located in the outer membrane protein F (OmpF) pore on a distance of, on average 2.6 nm, create separated regions where either cation or anions accumulate. Our work shows that biological channels can be made into electrostatic devices. Because one or more amino acid residues at any preferred position can be substituted by others, the precision and resolution of the charge distribution (created by chemical modification of a biological pore) is unprecedented compared to those in synthetic nanochannels."
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Post by aqt on Jan 24, 2010 16:16:36 GMT -5
a must see tiny.cc/x9YbgDirected Self- Assembly
Starts from a suspension of nanopatricles in fluid
Ends with ADVANCED SENSORS AND ACTUATORS, DEVICES, SYSTEMS AND PROCESSES.
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Post by aqt on Jan 24, 2010 16:25:33 GMT -5
tiny.cc/x9Ybg Advanced Hybrid NanofluidsHeat Transfer Nanofluid
Tribological Nanofluid
Surfactant and Coating Nanofluid
Chemical Nanofluid
Process/Extraction Nonaofluid
Environmental (pollutioon cleaning) Nanofluids
Bio- and Pharmaceutical Nanofluids (drug delivery and functional tissue cell interaction)NIU NanofluidsDevelopment of Advanced Hybrid NanofluidsPoly Nanofluids -Polymer Nanofluids
DR Nanofluid-Drag Reduction Nanofluid
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Post by aqt on Jan 24, 2010 16:35:44 GMT -5
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Post by aqt on Jan 24, 2010 16:45:20 GMT -5
protein repellency through self assembly of poly(ethylene ho.seas.ucla.edu/publications/journal/2009/Wong-MicroNanofluid-2009.pdfSince the introduction of microelectromechanical system (MEMS) technologies couple decades ago, intensive research efforts have been devoted in the field of microfluidicsAt first, silicon and glass based materials were commonly used Numerous microfluidic components, such as pumps, valves, mixers, and molecules and particles separators and concentrators, have been developed for a broad range of applications including chemistry, biology, physics, and medicine Poly(ethylene glycol) (PEG), also known as poly(ethylene oxide) (PEO), is a well known material for preventing nonspecific adsorption of proteins as well as its biocompatibility and low toxicity. Besides PEG, many hydrophilic synthetic and natural polymers used for static and dynamic coating in separation science, such as polyacrylamide, poly(vinyl alcohol) (PVA), hydroxylethylcellulose (HEC), poly (N-hydroxyethyl acrylamide) (PHEA), hydroxylpropyl methylcellulse (HPMC), poly(2-hydroxyethyl methacrylate) (pHEMA), poly(vinyl pyrrolidone) (PVP), poly (acrylic acid) (PAA), dextran, hyaluronic acid, and poly (2-methacryloyloxyethyl phosphorylcholine) (PMPC) have been derived for physical or covalent surface modifications of the microchannel wall (Some excellent reviews have documented on surface modification of microchannel made of various siliconbased and polymeric materials for the prevention of biofouling This review focuses on recent progress on surface modification methods in preparing nonbiofouling coating for PDMS and silica microfluidic devices and is divided into three main categories: surface activation, physical modification, and chemical modification.
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Post by aqt on Jan 24, 2010 16:52:20 GMT -5
tiny.cc/Zeg15Probing human skin as an information-rich smart biological interface using MEMS sensors aqt
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Post by aqt on Jan 24, 2010 17:08:09 GMT -5
vernix between the MEMS device and human skin will allow lipid binding via hydrophobic interactions at the periphery of the device with liquid (water) ... mems.eng.usf.edu/pub/Papers/23.pdfmolecular structure of the ultimate smart interface which means the one we got....ain't ultimate and prolly not too smart
they are continuing to hone their skills
and changing from glass to siliconeaqt
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Post by aqt on Jan 24, 2010 18:25:25 GMT -5
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Post by aqt on Jan 24, 2010 18:27:15 GMT -5
Previous studies on nanofluids have focused on spherical or long-fibre particles. In this work, a new type of complex nanoparticle-a hybrid sphere/carbon nanotube(CNT) particle, consisting of numerous CNTs attached to an alumina/iron oxide sphere-is proposed for applications in nanofluids. In such hybrid nanoparticles, heat is expected to transport rapidly from one CNT to another through the centre sphere and thus leading to less thermal contact resistance between CNTs when compared to simple CNTs dispersed in fluids. CNTs have an extremely high thermal conductivity, but thermal resistance between the CNTs and the fluid has limited their performance in nanofluids. The proposed hybrid sphere/CNT particles are synthesized by spray pyrolysis followed by catalytic growth of CNTs. The spheres are about 70 nm in diameter on average, and the attached CNTs have a length up to 2 ìm. These hybrid nanoparticles are dispersed to poly-alpha-olefin with sonication and a small amount of surfactants to form stable nanofluids. The thermal conductivity of the fluids has been measured by a 3ù-wire method over a temperature range 10-90 °C. The results indicate that the effective thermal conductivity of the fluids is increased by about 21% at room temperature for particle volume fractions of 0.2%. cat.inist.fr/?aModele=afficheN&cpsidt=18587052
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