scholarly journals Turn-off mode fluorescent norbornadiene-based photoswitches

2018 ◽  
Vol 20 (36) ◽  
pp. 23195-23201 ◽  
Author(s):  
Behabitu Ergette Tebikachew ◽  
Fredrik Edhborg ◽  
Nina Kann ◽  
Bo Albinsson ◽  
Kasper Moth-Poulsen
Keyword(s):  
Optical Memory ◽  
Memory Storage ◽  
Photochromic Molecules

To explore the potential of negative photochromic molecules for possible optical memory storage applications, we have here synthesized and studied a series of four norbornadiene–quadricyclane (NBD–QC) photoswitching molecules.

Reversible single-crystal-to-single-crystal conversion of a photoreactive coordination network for rewritable optical memory storage

2020 ◽  
Vol 56 (13) ◽  
pp. 1984-1987 ◽  
Author(s):  
Ni-Ya Li ◽  
Jing-Min Chen ◽  
Xiao-Yan Tang ◽  
Guo-Ping Zhang ◽  
Dong Liu
Keyword(s):  
Single Crystal ◽  
Optical Memory ◽  
Memory Storage ◽  
Coordination Network

Reversible single-crystal-to-single-crystal photoreaction of a coordination network exhibits switchable fluorescence for rewritable optical memory storage.

Self-Assembly of Gold Nanoparticle Arrays with Anodic Aluminum Oxide Template

2014 ◽  
Vol 1004-1005 ◽  
pp. 55-58
Author(s):  
Fei Wang ◽  
Hui Xu ◽  
Ying Wei Wang ◽  
Jing Yue Fang ◽  
Wei Chen ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Aluminum Oxide ◽  
Gold Nanoparticle ◽  
Anodic Aluminum Oxide ◽  
Optical Memory ◽  
Blue Shift ◽  
Memory Storage ◽  
Nanoparticle Arrays ◽  
Simple Method ◽  
Anodic Aluminum

Nanoparticles and their ordered arrays have many important applications in fields such as electronic, optical, memory storage devices and sensors. Herein, a simple method was used for fabricating three-dimensional ordered gold nanoparticle arrays with template technique. Gold films were deposited onto anodic aluminum oxide by using electron beam evaporation. After thermal annealing, interestingly, order arrays of gold nanoparticles were obtained by a thermodynamically driven self-assembled process. The spectrum taken by UV-Vis spectrophotometer demonstrates clear surface plasmon resonance at around 500 nm, which appears blue-shift compared with usual gold nanoparticles.

Polymeric nanostructured material for high-density three-dimensional optical memory storage

2001 ◽  
Vol 90 (10) ◽  
pp. 5328-5334 ◽  
Author(s):  
Bradley J. Siwick ◽  
Olga Kalinina ◽  
Eugenia Kumacheva ◽  
R. J. Dwayne Miller ◽  
Jaan Noolandi
Keyword(s):  
Three Dimensional ◽  
Optical Memory ◽  
Nanostructured Material ◽  
High Density ◽  
Memory Storage

Surface Enhanced Raman Spectroscopy Of AgTCNQ Formed From Ag Micellar And Inverse Micellar Colloidal Systems

1995 ◽  
Vol 413 ◽  
Author(s):  
Ivan W. Ong ◽  
Dwaine O. Cowan ◽  
Theodore O. Poehler
Keyword(s):  
Colloidal Particles ◽  
Optical Memory ◽  
Surface Enhanced Raman Spectroscopy ◽  
Memory Storage ◽  
Colloidal Systems ◽  
Laser Raman ◽  
The Past ◽  
Storage Media ◽  
Surface Enhanced ◽  
Surface Enhanced Raman

ABSTRACTSilver Tetracyanoquinodimethane (AgTCNQ) is an organometallic semiconductingcompound with potential for use as an optical memory storage media due to its ability to exist intwo states. A laser Raman system has been proposed for this application as the two states havedistinct Raman vibrational peaks. However, the Raman spectra of bulk AgTCNQ films is veryweak and requires special measures to prevent laser-induced degradation and to ensure adequatesignal to noise ratios. In this paper, we report a synthesis AgTCNQ consisting of AgTCNQnanolayers grown around silver colloidal particles in both water and heptane with the use of theamphiphilic surfactants, AOT and SDS. The Raman scattering of such AgTCNQ systems hasbeen found to be strongly enhanced and far superior to that obtained on bulk AgTCNQ films.We believe that such a system represents a novel and advantageous way of detecting theswitching behavior of AgTCNQ (and other metal-TCNQ compounds) by laser, as Ramanresearch on metal-TCNQ systems has been stymied in the past by poor Raman signals andsusceptibility to laser-induced degradation.

Microbial degradation of quadricyclane-derived tricyclo[2.2.1.02,6]heptan-3-ol in soil

1997 ◽  
Vol 43 (3) ◽  
pp. 300-303 ◽  
Author(s):  
Song Jin ◽  
Norbert G. Swoboda-Colberg ◽  
Patricia J. S. Colberg
Keyword(s):  
Optical Memory ◽  
Transformation Products ◽  
Jet Fuel ◽  
Memory Storage ◽  
Cyclic Hydrocarbon ◽  
Soil Microcosms ◽  
Storage Devices ◽  
Respiration Rates ◽  
Abiotic Transformation ◽  
Soil And Water

Quadricyclane (tetracyclo[3.2.02,7.04,6]heptane) is a strained, saturated cyclic hydrocarbon and a potential environmental contaminant because of uses in solar energy and optical memory storage devices and as a recently proposed additive to jet fuel. Quadricyclane is very unstable in both soil and water, and in the environment it exists as abiotic transformation products, tricyclo[2.2.1.02,6]heptan-3-ol and bicyclo[2.2.1]hept-5-en-2-ol. In soils, tricyclo[2.2.1.02,6]heptan-3-ol is microbially transformed to a C7H8O intermediate which we postulate to be tricyclo[2.2.1.02,6]heptan-3-one. This compound is subsequently biodegraded over several months. Elevated respiration rates in soils amended with tricyclo[2.2.1.02,6]heptan-3-ol provide evidence that it is mineralized to CO2, while bicyclo[2.2.1]hept-5-en-2-ol concentrations in soil microcosms remained unchanged over a period of 8 months.Key words: quadricyclane, biotransformation, biodégradation, tricyclo[2.2.1.02,6]heptan-3-ol, bicyclo[2.2.1]hept-5-en-2-ol.

scholarly journals The Role of Graphene Monolayers in Enhancing the Yield of Bacteriorhodopsin Photostates for Optical Memory Applications

2021 ◽  
Vol 11 (20) ◽  
pp. 9698
Author(s):  
Roma Patel ◽  
Gregory Salamone ◽  
Isaac Macwan
Keyword(s):  
Conformational Changes ◽  
Optical Memory ◽  
Single Layer ◽  
Md Simulations ◽  
Memory Storage ◽  
Single Layer Graphene ◽  
Salt Bridges ◽  
Retinal Chromophore ◽  
Memory Applications ◽  
Van Der Waals Energies

Bacteriorhodopsin (bR) is a photoactive protein that has gained increasing importance as a tool for optical memory storage due to its remarkable photochemical and thermal stability. The two stable photostates (bR and Q) obtained during the bR photocycle are appropriate to designate the binary bit 0 and 1, respectively. Such devices, however, have limited success due to a low quantum yield of the Q state. Many studies have used genetic and chemical modification as optimization strategies to increase the yield of the Q state. Nonetheless, this compromises the overall photochemical stability of bR. This paper introduces a unique way of stabilizing the conformations of bacteriorhodopsin and, thereby, the bR and Q photostates through adsorption onto graphene. All-atom molecular dynamics (MD) simulations with NAMD and CHARMM force fields have been used here to understand the interactive events at the interface of the retinal chromophore within bR and a single-layer graphene sheet. Based on the stable RMSD (~4.5 Å), secondary structure, interactive van der Waals energies (~3000 kcal/mol) and electrostatic energies (~2000 kcal/mol), it is found that the adsorption of bR onto graphene can stabilize its photochemical behavior. Furthermore, the optimal adsorption distance for bR is found to be ~4.25 Å from the surface of graphene, which is regulated by a number of interfacial water molecules and their hydrogen bonds. The conformations of the key amino acids around the retinal chromophore that are responsible for the proton transport are also found to be dependent on the adsorption of bR onto graphene. The quantity and lifetime of the salt bridges also indicate that more salt bridges were formed in the absence of graphene, whereas more were broken in the presence of it due to conformational changes. Finally, the analysis on the retinal dihedrals (C11 = C12-C13 = C14, C12-C13 = C14-C15, C13 = C14-C15 = NZ and C14-C15 = NZ-CE) show that bacteriorhodopsin in the presence of graphene exhibits increased stability and larger dihedral energy values.

SPATIAL CHAOS AND OPTICAL MEMORY

1988 ◽  
Vol 49 (C2) ◽  
pp. C2-451-C2-454
Author(s):  
W. J. FIRTH
Keyword(s):  
Optical Memory ◽  
Spatial Chaos
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