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Interfacial Catalysis at Oil/Water Interfaces
Published in Alexander G. Vdlkdv, Interfacial Catalysis, 2002
The main elements of molecular electronics are the molecular wire, conducting material, molecular-specific transducers of signals similar to the particles, and molecular switches, memories, emitters, detectors, etc. The flux of information between the molecules can be released in many ways. One of the most important is the transfer of individual charges in terms of electrons, holes, or hydrogen ions, or of other shapes similar to the elements, like solitons, soliton waves, or excitons. Molecular switches may be optical, electrical, magnetic, or thermally reversible systems. Storage of information in a molecular system can be realized through a change in the electronic as well as geometric structures of the molecules in reversible thermal reactions, e.g., conformational or configurational changes on replacement of hydrogen or protons.
Molecular Machines based on Macrocyclic Receptors: Switches and Motors
Published in Satish Kumar, Priya Ranjan Sahoo, Violet Rajeshwari Macwan, Jaspreet Kaur, Mukesh, Rachana Sahney, Macrocyclic Receptors for Environmental and Biosensing Applications, 2022
Satish Kumar, Priya Ranjan Sahoo, Violet Rajeshwari Macwan, Jaspreet Kaur, Mukesh, Rachana Sahney
Molecular Switches (MSs) are molecular systems that exhibit reversible stimuli-responsive switching between two or more different states based on bistability, are being widely studied in the solution phase. Molecular switches that are able to exhibit good control, rapid responsiveness as well as reversibility are well suited for the design of molecular devices used in drug delivery, information or sensing functions.
Introduction
Published in Vlad P. Shmerko, Svetlana N. Yanushkevich, Sergey Edward Lyshevski, Computer Arithmetics for Nanoelectronics, 2018
Vlad P. Shmerko, Svetlana N. Yanushkevich, Sergey Edward Lyshevski
A switch whose level is operated by a molecular phenomenon is called a molecular switch. The state of the molecular switch "contacts" when the switch is not energized (activated), is called the normal state of the switch. Thus, a molecular switch can have both normally open and normally closed states.
Electronic excitation and electric field as switching mechanism for a single-molecule switch
Published in Molecular Physics, 2023
Herbert Früchtl, Lorna M. Robertson, Tanja van Mourik
Research on molecular switches has blossomed over the last few decades, and papers reviewing this area have started to appear in the literature [4–6]. Molecular switches can be switched in a variety of ways, depending on the properties of the molecule, including conformational change, different spin states, charge states, dipole orientations, and bond formation. Switching can be initiated by external stimuli such as light, an electric field, temperature and chemical reactions. Usually a switch has two different states between which it can interconvert; however, recently a molecular switch that can photoswitch between eight different states via controlled rotations around three adjacent bonds has been presented [7]. Wavelengths required for switching are typically in the UV range, although switches that are triggered by irradiation with visible light have been reported as well [7,8]. Light offers many advantages over other stimuli, such as the ability to focus on a small area and to be switched on and off on a short timescale using, for example, laser pulses.
Fault detection and analysis of bistable rotaxane molecular electronic switch - A simulation approach
Published in Journal of Experimental Nanoscience, 2018
Unlike the conventional Complementary Metal Oxide Semiconductor (CMOS) lithography, nano electronic devices are manufactured through the stochastic self-assembled bottom-up approach which allows the components to guide each other in constructing a structure with no outside intervention. Zhang at.al describes a method for controlling the self assembly of nanoparticles through reversible supra molecular interactions [6]. By utilizing specific intra molecular interactions, regular array like structure are easy to produce with this kind of manufacturing technology [3]. Since two terminal devices like molecular switches in crossbar circuits are more advantageous than three terminal devices in terms of flexible designs and reduced area requirement they become dominant category device [7]. A group of molecules prepared artificially from two or more mechanically coupled components can work as simple switches [8]. Molecular switches remain stable in absence of electrical stimulation while they can turn ON/OFF in its presence. ON/OFF state of a molecular switch corresponds to the two stable states/geometry of the molecule can attain. The state change is normally reversible [3].
Self-assembled molecular devices: a minireview
Published in Instrumentation Science & Technology, 2020
In addition to spiropyran, azobenzene is also considered to be a typical photoinduced molecular switch with two conformational isomers (trans and cis). The selective conversion between the two isomers can be achieved by applying appropriate a light source and wavelength. Jaekel et al.[67] reported photoinduced isomerization of azobenzene derivatives on insulator surfaces. 4-Methoxy-3,3′ and 5,5′-tetra-tert-butylazobenzene (M-TBA) are molecular switches with two conformational isomers (trans and cis). Under laser irradiation with 330 nm radiation, M-TBA is converted from trans-isomer → cis-isomer, while under the laser irradiation at 440 nm, M-TBA is transformed from cis-isomer → trans-isomer. This process is completely reversible.