scholarly journals Nonthermal Transport of Energy Driven by Photoexcited Carriers in Switchable Solid States of GeTe

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
R. Gu ◽  
T. Perrault ◽  
V. Juvé ◽  
G. Vaudel ◽  
M. Weis ◽  
...  
Keyword(s):  
Solid States

scholarly journals Un-jamming due to energetic instability: statics to dynamics

2021 ◽  
Vol 23 (4) ◽  
Author(s):  
Stefan Luding ◽  
Yimin Jiang ◽  
Mario Liu
Keyword(s):  
Granular Matter ◽  
Numerical Data ◽  
Soft Materials ◽  
Material Point ◽  
Solid States ◽  
Granular Gas ◽  
Granular Solid Hydrodynamics ◽  
Particle Simulations ◽  
Points Of View ◽  
Deformation Modes

Abstract Jamming/un-jamming, the transition between solid- and fluid-like behavior in granular matter, is an ubiquitous phenomenon in need of a sound understanding. As argued here, in addition to the usual un-jamming by vanishing pressure due to a decrease of density, there is also yield (plastic rearrangements and un-jamming that occur) if, e.g., for given pressure, the shear stress becomes too large. Similar to the van der Waals transition between vapor and water, or the critical current in superconductors, we believe that one mechanism causing yield is by the loss of the energy’s convexity (causing irreversible re-arrangements of the micro-structure, either locally or globally). We focus on this mechanism in the context of granular solid hydrodynamics (GSH), generalized for very soft materials, i.e., large elastic deformations, employing it in an over-simplified (bottom-up) fashion by setting as many parameters as possible to constant. Also, we complemented/completed GSH by using various insights/observations from particle simulations and calibrating some of the theoretical parameters—both continuum and particle points of view are reviewed in the context of the research developments during the last few years. Any other energy-based elastic-plastic theory that is properly calibrated (top-down), by experimental or numerical data, would describe granular solids. But only if it would cover granular gas, fluid, and solid states simultaneously (as GSH does) could it follow the system transitions and evolution through all states into un-jammed, possibly dynamic/collisional states—and back to elastically stable ones. We show how the un-jamming dynamics starts off, unfolds, develops, and ends. We follow the system through various deformation modes: transitions, yielding, un-jamming and jamming, both analytically and numerically and bring together the material point continuum model with particle simulations, quantitatively. Graphic abstract

Regioisomeric AIE-active luminogens with a substituent aldehyde group for controllable and reversible photochromic behavior and sensitive fluorescence detection of hydrogen sulfite

2021 ◽  
Vol 9 (11) ◽  
pp. 3882-3891
Author(s):  
Hai-Xia Yu ◽  
Junge Zhi ◽  
Jin-Liang Wang
Keyword(s):  
Fluorescence Detection ◽  
Aldehyde Group ◽  
Photochromic Behavior ◽  
Solid States

Three simple AIE-active molecules displayed obvious photoactive behaviors in both solution and solid states and selective sensing of hydrogen sulfite.

Lanthanide dodecyl sulfates, a potent family of catalysts for the preparation of biobased epoxy thermosetting polymers

2021 ◽  
Author(s):  
Forouzan Kazemi ◽  
Louis Schutz ◽  
Jean-Yves Bergeron ◽  
Eric Gagnon ◽  
Glenn P A Yap ◽  
...  
Keyword(s):  
Solid States ◽  
Thermosetting Polymers

Lanthanide dodecyl sulfates, LnDSx, are remarkably effective to catalyze the reaction of diepoxides with diamines in the liquid and solid states, the key reaction in the formation of epoxy thermosets....

Laser Spectrofluorimetry of Chlorophylls

1974 ◽  
Vol 52 (22) ◽  
pp. 3723-3727 ◽  
Author(s):  
Roger M. Leblanc ◽  
Geneviève Galinier ◽  
Alain Tessier ◽  
Lise Lemieux
Keyword(s):  
Chlorophyll A ◽  
Emission Spectra ◽  
Polarization Rotator ◽  
Excitation Beam ◽  
Solid States ◽  
Set Up

A device has been set up to determine quantitatively the weak fluorescence intensities of pigment molecules. It consists of a laser spectrofluorimeter. The excitation beam can be produced with either a He/Cd laser (441.6 nm) or a He/Ne laser (632.8 nm). This system allows us to detect the fluorescence of dilute chlorophyll a or b solutions of the order of 10−12 mol/l. This sensitivity also permits the study of the emission spectra from chlorophyll in monomolecular or solid states, and since a polarization rotator has been incorporated into our apparatus, one may presume some possible orientation of the molecules.

Probing weak non-covalent interactions in solution and solid states with designed molecules

2009 ◽  
Vol 11 (1) ◽  
pp. 97-100 ◽  
Author(s):  
Abil E. Aliev ◽  
Joëlle Moïse ◽  
William B. Motherwell ◽  
Miloslav Nič ◽  
Denis Courtier-Murias ◽  
...  
Keyword(s):  
Solid States ◽  
Non Covalent Interactions ◽  
Covalent Interactions

PRELIMINARY OPTICAL STUDY ON ER FLUIDS

1994 ◽  
Vol 08 (20n21) ◽  
pp. 2921-2933 ◽  
Author(s):  
L. W. ZHOU ◽  
J. F. YE ◽  
R. B. TAO ◽  
Y. TANG ◽  
J. F. PENG ◽  
...  
Keyword(s):  
Phase Transition ◽  
Electric Field ◽  
Electric Fields ◽  
Nonlinear Optical ◽  
Second Harmonic ◽  
Optical Response ◽  
Optical Study ◽  
Solid States ◽  
Linear And Nonlinear ◽  
Er Fluids

Linear and nonlinear optical study on electrorheological (ER) fluids is reported. The ER fluids under the investigation were glass beads, zeolite and ferroelectrics. The linear optical response of some ER fluids showed sharp changes near critical electric fields. An enhancement of electric field induced second harmonic generations (EFISH) was observed as the function of E2, where E is the external electric field. The said enhancement is considered to be corresponding to a modulation of the material's refractive index associated with the electric field induced polarization of the delocalized electrons. The enhanced nonlinear optical response on the transition between liquid and solid states can be related to the phase transition in ER fluids.

scholarly journals Synthesis of a Benzothiadiazole-Based D−A Molecule with Aggregation-Induced Emission and Controlled Assembly Properties

Processes ◽  
2021 ◽  
Vol 9 (7) ◽  
pp. 1094
Author(s):  
Songhua Chen ◽  
Yongqi Liu ◽  
Meiyun He ◽  
Jianhua Huang
Keyword(s):  
Synergistic Effects ◽  
Preparation Methods ◽  
Solvent Vapor ◽  
Aggregation Induced Emission ◽  
Solid States ◽  
Diluted Solution ◽  
Non Covalent Interactions ◽  
Fluorescent Quantum Yield ◽  
Donor Moiety ◽  
Covalent Interactions

An electron-donating−accepting (D−A) molecule, namely, 4-(1-(4-(9H-carbazol-9-yl)phenyl)-1H-1,2,3-triazol-4-yl)benzo[c][1,2,5]thiadiazole (BT-SCC) containing carbazole as the donor moiety and benzothiadiazole as the acceptor moiety is prepared. Single-crystal X-ray structure analysis elucidated the multiple intermolecular interactions, such as hydrogen bonds, CH…π, and π…π interplays. Interestingly, the aggregation-induced emission phenomenon is observed for BT-SCC featured with enhanced fluorescent quantum yield from diluted solution of CH2Cl2 (Φ = ca. 0.1) to CH2Cl2/hexane mixed solutions or solid states (Φ = ca. 0.8). Finally, aggregates of BT-SCC are obtained through precipitating from hot and saturated solutions or solvent-vapor methods and the aggregating morphologies could be easily controlled through different preparation methods. Fabulous cube-like micro-crystals and nanospherical structures are obtained, which is established by the synergistic effects of the multiple non-covalent interactions, endowing potential utility in the field of optoelectronic devices.

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