Nonrigidity, delocalization, spatial confinement and electronic-vibrational spectroscopy of anthracene–helium clusters

2001 ◽  
Vol 115 (22) ◽  
pp. 10175 ◽  
Author(s):  
Andreas Heidenreich ◽  
Uzi Even ◽  
Joshua Jortner
Keyword(s):  
Vibrational Spectroscopy ◽  
Spatial Confinement ◽  
Helium Clusters

Vibrational Spectroscopy of Sulfur Hexafluoride Attached to Helium Clusters

1994 ◽  
Vol 73 (18) ◽  
pp. 2512-2512 ◽  
Author(s):  
S. Goyal ◽  
D. L. Schutt ◽  
G. Scoles
Keyword(s):  
Vibrational Spectroscopy ◽  
Sulfur Hexafluoride ◽  
Helium Clusters

Vibrational spectroscopy of small water complexes embedded in large liquid helium clusters

1996 ◽  
Vol 105 (15) ◽  
pp. 6128-6140 ◽  
Author(s):  
Ralf Fröchtenicht ◽  
Michael Kaloudis ◽  
Martin Koch ◽  
Friedrich Huisken
Keyword(s):  
Liquid Helium ◽  
Vibrational Spectroscopy ◽  
Helium Clusters ◽  
Small Water

VIBRATIONAL SPECTROSCOPY, RESONANCE FRACTION AND MOLECULAR MOTION

1974 ◽  
Vol 35 (C6) ◽  
pp. C6-131-C6-137 ◽  
Author(s):  
Y. HAZONY ◽  
R. H. HERBER
Keyword(s):  
Vibrational Spectroscopy ◽  
Molecular Motion

Spectroscopy of small helium clusters and "nanoscopic" superfluidity: HeN - CO, N = 2 - 20...

2009 ◽  
Vol 179 (3) ◽  
pp. 317 ◽  
Author(s):  
Boris S. Dumesh ◽  
A.V. Potapov ◽  
L.A. Surin
Keyword(s):  
Helium Clusters

X-ray Structure Refinement and Vibrational Spectroscopy of Ca8Gd2 (PO4)6 O2

2013 ◽  
Vol 12 (10) ◽  
pp. 719-726
Author(s):  
R. Ayadi ◽  
Mohamed Boujelbene ◽  
T. Mhiri
Keyword(s):  
Solid State ◽  
General Formula ◽  
Vibrational Spectroscopy ◽  
Powder Diffraction ◽  
Infrared Spectra ◽  
Solid State Reaction ◽  
Structure Refinement ◽  
Unit Cell ◽  
Cell Group ◽  
X Ray

The present paper is interested in the study of compounds from the apatite family with the general formula Ca10 (PO4)6A2. It particularly brings to light the exploitation of the distinctive stereochemistries of two Ca positions in apatite. In fact, Gd-Bearing oxyapatiteCa8 Gd2 (PO4)6O2 has been synthesized by solid state reaction and characterized by X-ray powder diffraction. The site occupancies of substituents is0.3333 in Gd and 0.3333 for Ca in the Ca(1) position and 0. 5 for Gd in the Ca (2) position.  Besides, the observed frequencies in the Raman and infrared spectra were explained and discussed on the basis of unit-cell group analyses.

Ultrastrong, Free-Standing and Large Nanofilms of Pyrenearamid

2019 ◽  
Author(s):  
Amalia Rapakousiou ◽  
Alejandro López-moreno ◽  
Belén Nieto-Ortega ◽  
M. Mar Bernal ◽  
Miguel A. Monclús ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Building Block ◽  
Aromatic Polyamide ◽  
Free Standing ◽  
Spatial Confinement ◽  
Polymeric Structure ◽  
Reduced Modulus ◽  
Organizational Arrangement ◽  
Polycyclic Aromatic ◽  
Nanoscale Building Block

We introduce poly(1,6-pyrene terephthalamide) polymer (PPyrTA) as an aromatic polyamide analogue of poly(p-phenylene terephthalamide) (PPTA), also known as Kevlar®. This work shows that the incorporation of polycyclic aromatic pyrene moieties improves drastically the mechanical properties of the polymeric structure, increasing elastic nanoindentation-determined modulus and hardness by factors of 1.9 and 4.3, respectively. Liquid deprotonated dispersions of PPyrTA nanofibers were used as nanoscale building block for producing large-surface, free-standing polymer macroscopic nanofilms. This 2D assembly leads to further significant improvements in reduced modulus and hardness (more than twice) compared to the starting polymer macroscale fibres, due to a better re-organizational arrangement of the PPyrTA nanofibers in the nanofilms, formed under 2D spatial confinement.

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