Polarized Fluorescence Spectrum of Naphthalene Excimer in a Stretched Polymer Film

1979 ◽  
Vol 83 (8) ◽  
pp. 821-825 ◽  
Author(s):  
Michio Kobayashi ◽  
Yoshie Tanizaki ◽  
Toshihiko Hoshi ◽  
Junko Yoshino ◽  
Masamichi Komuro
Keyword(s):  
Polymer Film ◽  
Fluorescence Spectrum ◽  
Polarized Fluorescence

scholarly journals Characterization of the orientation of ethanol-water clusters by polarized fluorescence spectrum

2007 ◽  
Vol 56 (5) ◽  
pp. 2962
Author(s):  
Liu Ying ◽  
Song Chun-Yuan ◽  
He Wen-Liang ◽  
Luo Xiao-Sen ◽  
Lu Jian ◽  
...  
Keyword(s):  
Fluorescence Spectrum ◽  
Water Clusters ◽  
Polarized Fluorescence

A Fluorescence Study of Hematoporphyrin

1973 ◽  
Vol 27 (6) ◽  
pp. 444-449 ◽  
Author(s):  
R. C. Srivastava ◽  
V. D. Anand ◽  
W. R. Carper
Keyword(s):  
Fluorescence Spectrum ◽  
Visible Region ◽  
Molecular Association ◽  
Polarized Fluorescence ◽  
Fluorescence Study ◽  
Absorption Bands ◽  
Intense Band ◽  
Fluorescence Characteristics ◽  
Polarization Factor

The fluorescence characteristics of hematoporphyrin have been studied at 26°C as a function of concentration and pH. The pk values are 4.7 and 8.2 as determined in water and water-ethanol mixtures. The fluorescence spectrum consists of a peak at 625 nm and a second, less intense band at 675 nm. These emission bands are assigned to the Qy (0 → 0) and Qx (0 → 0) states. The four absorption bands in the visible region are assigned to π → π* transitions as follows: 502 nm, (1 ← 0); 536 nm, Qy (0 ← 0); 557 nm, Qx (1 ← 0); and 605 nm, Qx (0 ← 0). Corresponding excitation wavelengths include 505,540,570, and 620 nm. Polarized fluorescence is used to establish molecular association as a function of concentration. The polarization factor is used to verify the change from D2h to D4h symmetry as a function of pH.

Polarized fluorescence spectrum of triphenylene in a n‐heptane single crystal. Evidence for deformed molecules

1978 ◽  
Vol 69 (8) ◽  
pp. 3639-3646 ◽  
Author(s):  
Michel Lamotte ◽  
Salomon Risemberg ◽  
Anne‐Marie Merle ◽  
Jacques Joussot–Dubien
Keyword(s):  
Single Crystal ◽  
Fluorescence Spectrum ◽  
Polarized Fluorescence

scholarly journals Erratum: Polarized fluorescence spectrum of triphenylene in an‐heptane single crystal. Evidence for deformed molecules

1979 ◽  
Vol 70 (4) ◽  
pp. 2050-2050
Author(s):  
Michel Lamotte ◽  
Salomon Risemberg ◽  
Anne‐Marie Merle ◽  
Jacques Joussot‐Dubien
Keyword(s):  
Single Crystal ◽  
Fluorescence Spectrum ◽  
Polarized Fluorescence

A simple strategy for fabricating honeycomb patterns on commercially available polymer film under a wide humidity range

2020 ◽  
Vol 35 (23-24) ◽  
pp. 3210-3221
Author(s):  
Kai Huang ◽  
Qi Cheng ◽  
Honglei Zhang ◽  
Ligang Lin ◽  
Qiying Wang
Keyword(s):  
Polymer Film ◽  
Simple Strategy ◽  
Humidity Range

Abstract

Dynamics of Nanoparticle Chain Aggregates of Carbon Under Tension

2003 ◽  
Vol 778 ◽  
Author(s):  
Rajdip Bandyopadhyaya ◽  
Weizhi Rong ◽  
Yong J. Suh ◽  
Sheldon K. Friedlander
Keyword(s):  
Mechanical Properties ◽  
Carbon Black ◽  
Polymer Film ◽  
Elastic Behavior ◽  
Small Strains ◽  
Transmission Electron ◽  
Chain Aggregates ◽  
Nanoparticle Chains ◽  
Reinforcing Filler

AbstractCarbon black in the form of nanoparticle chains is used as a reinforcing filler in elastomers. However, the dynamics of the filler particles under tension and their role in the improvement of the mechanical properties of rubber are not well understood. We have studied experimentally the dynamics of isolated nanoparticle chain aggregates (NCAs) of carbon made by laser ablation, and also that of carbon black embedded in a polymer film. In situ studies of stretching and contraction of such chains in the transmission electron microscope (TEM) were conducted under different maximum values of strain. Stretching causes initially folded NCA to reorganize into a straight, taut configuration. Further stretching leads to either plastic deformation and breakage (at 37.4% strain) or to a partial elastic behavior of the chain at small strains (e.g. 2.3% strain). For all cases the chains were very flexible under tension. Similar reorientation and stretching was observed for carbon black chains embedded in a polymer film. Such flexible and elastic nature of NCAs point towards a possible mechanism of reinforcement of rubber by carbon black fillers.

Polarized Fluorescence of Spin-coated Polymeric Thin Films

2007 ◽  
Vol 2 (2) ◽  
pp. 257-264
Author(s):  
Satoko Nishiyama ◽  
Masahiro Tajima ◽  
Yasuhiko Yoshida
Keyword(s):  
Thin Films ◽  
Polarized Fluorescence ◽  
Polymeric Thin Films

Internal stresses in plasma deposited polymer film coatings

2018 ◽  
pp. 21-26
Author(s):  
M.P. Danilaev ◽  
◽  
E.A. Bogoslov ◽  
Yu.E. Polsky ◽  
I.V. Yanilkin ◽  
...  
Keyword(s):  
Polymer Film ◽  
Internal Stresses ◽  
Film Coatings
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