The aspartic protease cathepsin E has been shown to induce apoptosis in cancer cells under physiological conditions. Therefore, cathepsin E-activity-enhancing peptides functioning in the physiological pH range are val...
By embedding “dilute” gold nanoparticles in single polystyrene thin films as “markers”, we probe the local viscosity of the free surface at temperatures far above the glass transition temperature (Tg). The techniq...
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By embedding “dilute” gold nanoparticles in single polystyrene thin films as “markers”, we probe the local viscosity of the free surface at temperatures far above the glass transition temperature (Tg). The technique used was x-ray photon correlation spectroscopy with resonance-enhanced x-ray scattering. The results clearly showed the surface viscosity is about 30% lower than the rest of the film. We found that this reduction is strongly associated with chain entanglements at the free surface rather than the reduction in Tg.
The reconstruction and evaporation at graphene nanoribbon (GNR) edges are investigated by tight-binding molecular-dynamics simulations and ab initio calculations. It is observed that reconstruction through the formati...
The reconstruction and evaporation at graphene nanoribbon (GNR) edges are investigated by tight-binding molecular-dynamics simulations and ab initio calculations. It is observed that reconstruction through the formation of pentagon-heptagon pairs can take place quickly along the zigzag edge and it is energetically favorable. At very high temperatures, the armchair edge is found to change into a zigzag edge structure, which further accelerates the evaporation of carbon atoms and leads to the formation of carbon linear chains. The evaporation of carbon atoms from both the zigzag and armchair edges is preceded by the formation of heptagon rings, which serve as a gateway for carbon atoms to escape. In the simulation for a GNR armchair-zigzag-armchair junction, carbon atoms are evaporated row by row from the outermost row of the zigzag edge while the armchair edge remains nearly intact. These results can be applied to nanoelectronic devices fabrication through the temperature-controlled edge structure of GNR.
Devices for continuous glucose monitoring (CGM) are currently a major focus of research in the area of diabetes management. It is envisioned that such devices will have the ability to alert a diabetes patient (or the ...
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We developed an optical tweezers directed approach that allows synthesis of different oligonucleotide on an array of controlled pore glass (CPG) beads in parallel in a two-stream laminar flow microreactor and obtained...
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We developed an optical tweezers directed approach that allows synthesis of different oligonucleotide on an array of controlled pore glass (CPG) beads in parallel in a two-stream laminar flow microreactor and obtained one oligo sequence per bead. This reactor has been shown to effectively facilitate CPG bead loading and confinement, maintain liquid/ liquid (inert liquid/reagent) interface and withstand the reagents and solvents present in the modified phosphoramidite chemistry. The optical tweezers allows us to externally manipulate the CPG beads inside the channel without having to modify the microfluidic device itself. The parallel synthesis of several different oligonucleotides in a single synthetic run was demonstrated.
Presented is a study of uncompensated magnetization in antiferromagnets performed by SQUID and VSM magnetometry, and polarized neutron reflectometry. This uncompensated magnetization is observed and studied as a funct...
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Single-walled carbon nanotubes (SWCNTs) prepared by the HiPco process were purified using a modified gas phase purification technique. A TEM-STM holder was used to study the morphological changes of SWCNT ropes as a f...
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This work presents a novel and low-cost printing technique to construct a three-layer (Pd/Ni/Cu) structure as front side conductor of textured mono-crystalline silicon solar cells. The technique involves microcontact ...
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This work presents a novel and low-cost printing technique to construct a three-layer (Pd/Ni/Cu) structure as front side conductor of textured mono-crystalline silicon solar cells. The technique involves microcontact printing and electrochemical deposition. Electrochemical deposition including electroless Ni and electroplated Cu offers an inexpensive method in contrast to the conventional silver-paste. The first step of this technique is activation by Pd nanoparticles. The Pd nanoparticles with average particle size about 2.65 nm are then mixed with organic solvent to prepare Pd ink. Then we imprint Pd ink on the front side of solar cell by microcontact printing, which can print fine-lines of less than 60 μm width. The second layer is electroless nickel providing low contact resistance and good mechanical adhesion. The third layer is electrodeposited Cu to increase the line conductivity. X-ray diffraction (XRD) technique and secondary electron microscopy (SEM) were employed to detect the presence of nickel-silicides phase after annealing. This new scheme has proven to be workable and may become an alternative approach for surface metallization on solar cell.
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