scholarly journals Effect of lubricants on the rotational transmission between solid-state gears

2022 ◽  
Vol 13 ◽  
pp. 54-62
Author(s):  
Huang-Hsiang Lin ◽  
Jonathan Heinze ◽  
Alexander Croy ◽  
Rafael Gutiérrez ◽  
Gianaurelio Cuniberti
Keyword(s):  
Solid State ◽  
Angular Velocity ◽  
Molecular Species ◽  
Formation Process ◽  
Friction And Wear ◽  
Center Of Mass ◽  
Bond Formation ◽  
Mechanical Systems ◽  
Md Simulations ◽  
Microscopic Scale

Lubricants are widely used in macroscopic mechanical systems to reduce friction and wear. However, on the microscopic scale, it is not clear to what extent lubricants are beneficial. Therefore, in this study, we consider two diamond solid-state gears at the nanoscale immersed in different lubricant molecules and perform classical MD simulations to investigate the rotational transmission of motion. We find that lubricants can help to synchronize the rotational transmission between gears regardless of the molecular species and the center-of-mass distance. Moreover, the influence of the angular velocity of the driving gear is investigated and shown to be related to the bond formation process between gears.

The Raman Microprobe: A New Analytical Tool for Studying Solid Phase Reactions

1983 ◽  
Vol 37 (6) ◽  
pp. 512-514 ◽  
Author(s):  
M. C. Dhamelincourt ◽  
P. Dhamelincourt
Keyword(s):  
Raman Spectroscopy ◽  
Solid State ◽  
Ambient Temperature ◽  
Molecular Species ◽  
Lead Oxide ◽  
Solid Phase ◽  
Analytical Tool ◽  
Microscopic Scale ◽  
Raman Microprobe ◽  
Solid Phase Reactions

Vibrational Raman spectroscopy has already been used to study reactions in the solid state. However, until now, this technique provided only an overall indication of the reaction. With the development of Raman microprobe, it is now possible to identify positively, at the microscopic scale, the various molecular species appearing at the interface between reactants. The reaction between copper sulfate (CuSO45H2O) and lead oxide (αPbO) at ambient temperature is used as an illustration.

A kinetic study of mechanochemical halogen bond formation by in situ31P solid-state NMR spectroscopy

2017 ◽  
Vol 53 (71) ◽  
pp. 9930-9933 ◽  
Author(s):  
Yijue Xu ◽  
Lysiane Champion ◽  
Bulat Gabidullin ◽  
David L. Bryce
Keyword(s):  
Activation Energy ◽  
Solid State ◽  
Nmr Spectroscopy ◽  
Kinetic Study ◽  
Solid State Nmr ◽  
Halogen Bond ◽  
Bond Formation ◽  
Nmr Studies ◽  
Solid State Nmr Spectroscopy

In situ 31P solid-state NMR studies of mechanochemical halogen bond formation provide insights into the cocrystallisation process and an estimate of the activation energy.

scholarly journals A microscopic look at the Johari-Goldstein relaxation in a hydrogen-bonded glass-former

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
F. Caporaletti ◽  
S. Capaccioli ◽  
S. Valenti ◽  
M. Mikolasek ◽  
A. I. Chumakov ◽  
...  
Keyword(s):  
Time Domain ◽  
Glassy State ◽  
Center Of Mass ◽  
Relaxation Processes ◽  
Undercooled Liquid ◽  
Microscopic Scale ◽  
Glass Forming ◽  
Full Explanation ◽  
Molecular Scale ◽  
Hydrogen Bonded

Abstract Understanding the glass transition requires getting the picture of the dynamical processes that intervene in it. Glass-forming liquids show a characteristic decoupling of relaxation processes when they are cooled down towards the glassy state. The faster (βJG) process is still under scrutiny, and its full explanation necessitates information at the microscopic scale. To this aim, nuclear γ-resonance time-domain interferometry (TDI) has been utilized to investigate 5-methyl-2-hexanol, a hydrogen-bonded liquid with a pronounced βJG process as measured by dielectric spectroscopy. TDI probes in fact the center-of-mass, molecular dynamics at scattering-vectors corresponding to both inter- and intra-molecular distances. Our measurements demonstrate that, in the undercooled liquid phase, the βJG relaxation can be visualized as a spatially-restricted rearrangement of molecules within the cage of their closest neighbours accompanied by larger excursions which reach out at least the inter-molecular scale and are related to cage-breaking events. In-cage rattling and cage-breaking processes therefore coexist in the βJG relaxation.

Metal-free synthesis of alkynyl alkyl selenides via three-component coupling of terminal alkynes, Se, and epoxides

2018 ◽  
Vol 20 (7) ◽  
pp. 1560-1563 ◽  
Author(s):  
Ge Wu ◽  
Lin Min ◽  
Hongchen Li ◽  
Wenxia Gao ◽  
Jinchang Ding ◽  
...  
Keyword(s):  
Formation Process ◽  
Bond Formation ◽  
Coupling Reaction ◽  
Terminal Alkynes ◽  
Metal Free ◽  
Three Component Coupling

A metal-free three-component coupling reaction of alkynes, Se powder and epoxides is described, providing an efficient, straightforward route for the preparation of alkynyl alkyl selenides via a double C–Se bond formation process.

Best of Two Worlds? How MD Simulations of Amphiphilic Helical Peptides in Membranes Can Complement Data from Oriented Solid-State NMR

2018 ◽  
Vol 14 (11) ◽  
pp. 6002-6014 ◽  
Author(s):  
Sabine Reißer ◽  
Erik Strandberg ◽  
Thomas Steinbrecher ◽  
Marcus Elstner ◽  
Anne S. Ulrich
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Md Simulations ◽  
Helical Peptides
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