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Your search keyword '"Shraga, Natalie"' showing total 7 results
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7 results on '"Shraga, Natalie"'

1. Organic reactions promoted by mucin glycoproteins

Author

Shraga, Natalie, Belgorodsky, Bogdan, and Gozin, Michael

Subjects
Diels-Alder reaction -- Analysis, Esters -- Chemical properties, Glycoproteins -- Structure, Glycoproteins -- Chemical properties, Hydrolysis -- Analysis, Hydrophobic effect -- Analysis, Chemistry
Abstract

Bovine submaxillary mucin and porcine gastric mucin have accelerated the rate of fatty acid p-nitrophenol ester hydrolysis up to 337 times and a carbon-carbon bond-forming Diels-Alder reaction between N-propylmaleimide and anthracene up to 200 times relative to the rates of the reference processes. The new properties of mucins to accelerate organic reactions have provided a new example of natural nonenzymatic proteins capable of promoting reactions of hydrophobic materials in aqueous solution.

Published
2009

2. Gated-Controlled Rectification of a Self-Assembled Monolayer-Based Transistor

Author

Mentovich, Elad D., Rosenberg-Shraga, Natalie, Kalifa, Itsik, Gozin, Michael, Mujica, Vladimiro, Hansen, Thorsten, and Richter, Shachar

Abstract

A vertical gate symmetrical molecular transistor is demonstrated. It includes self-assembled monolayer of ferrocene molecules chemically bonded to be a flat Au source and Au nanoparticles drain electrodes while gated with the central gate electrode. Using this configuration, we show that negative differential resistance, symmetrical behavior, and rectification effects can be tuned by controlling the gate voltage. The I–Vcurves shift from symmetric to strongly rectifying over a gate voltage range of a few tenths of volts around a threshold value where the junction behaves symmetrically. This is due to charging of the nanoparticle contact, which modifies the spatial profile of the voltage across the junction, a fact that we have included in a simple theoretical model that explains our experimental results quite well. Our device design affords a new way to fine-tune the rectification of molecular devices in a way that does not necessarily involve the Coulomb charging of the wire.

Published
2024
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3. Gated-controlled rectification of a self-assembled monolayer-based transistor

Author

Mentovich, Elad D., Rosenberg-Shraga, Natalie, Kalifa, Itsik, Gozin, Michael, Mujica, Vladimiro, Hansen, Thorsten, Richter, Shachar, Mentovich, Elad D., Rosenberg-Shraga, Natalie, Kalifa, Itsik, Gozin, Michael, Mujica, Vladimiro, Hansen, Thorsten, and Richter, Shachar

Abstract

A vertical gate symmetrical molecular transistor is demonstrated. It includes self-assembled monolayer of ferrocene molecules chemically bonded to be a flat Au source and Au nanoparticles drain electrodes while gated with the central gate electrode. Using this configuration, we show that negative differential resistance, symmetrical behavior, and rectification effects can be tuned by controlling the gate voltage. The I-V curves shift from symmetric to strongly rectifying over a gate voltage range of a few tenths of volts around a threshold value where the junction behaves symmetrically. This is due to charging of the nanoparticle contact, which modifies the spatial profile of the voltage across the junction, a fact that we have included in a simple theoretical model that explains our experimental results quite well. Our device design affords a new way to fine-tune the rectification of molecular devices in a way that does not necessarily involve the Coulomb charging of the wire.

Published
2013

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