Phase-Separation Structure of a Monolayer of Binary Polymer Blend Studied by Fluorescence Scanning Near-Field Optical Microscopy

1999 ◽  
Vol 103 (48) ◽  
pp. 10553-10556 ◽  
Author(s):  
Hiroyuki Aoki ◽  
Yuji Sakurai ◽  
Shinzaburo Ito ◽  
Tatsuo Nakagawa
Keyword(s):  
Phase Separation ◽  
Optical Microscopy ◽  
Polymer Blend ◽  
Near Field ◽  
Binary Polymer

Near-field photoconductivity imaging of a conjugated polymer blend

2001 ◽  
Vol 708 ◽  
Author(s):  
R. Riehn ◽  
R. Stevenson ◽  
J.J.M. Halls ◽  
D.R. Richards ◽  
D.-J. Kang ◽  
...  
Keyword(s):  
Phase Separation ◽  
Chemical Composition ◽  
Optical Microscopy ◽  
Polymer Blend ◽  
Conjugated Polymer ◽  
Near Field ◽  
Absorbed Energy ◽  
Generation Efficiency ◽  
Good Correspondence ◽  
Photocurrent Generation

ABSTRACTWe report combined scanning near-field optical microscopy (SNOM) and near-field photocurrent (NPC) imaging of a binary conjugated polymer blend. We find phase separation on a scale of about 5 μm, with a good correspondence between topographic, fluorescence, and photocurrent images. We excited at 488 nm, a wavelength at which only one of the two polymers absorbs light. Under this illumination regions that are high in the topography image show high luminescence and photocurrent.The photoluminescence (PL) efficiencies in the different regions of the sample were determined by calculating the absorbed energy using the Bethe-Bouwkamp model, and knowledge about the chemical composition of the different phases of the polymer blend. The calculation also allowed us to conclude that the photocurrent generation efficiency (current/absorbed photons) of the different polymer phases is comparable within the limit of confidence of this experiment (±10 %).

Soft-shear induced phase-separated nanoparticle string-structures in polymer thin films

2016 ◽  
Vol 186 ◽  
pp. 31-43 ◽  
Author(s):  
Ren Zhang ◽  
Bongjoon Lee ◽  
Michael R. Bockstaller ◽  
Abdullah M. Al-Enizi ◽  
Ahmed Elzatahry ◽  
...  
Keyword(s):  
Thin Film ◽  
Phase Separation ◽  
Polymer Blends ◽  
Polymer Blend ◽  
Polymer Chains ◽  
Translation Speed ◽  
Binary Polymer ◽  
The Matrix ◽  
P Application ◽  
Nanoparticle Structure

Application of shear stress has been shown to unidirectionally orient the microstructures of block copolymers and polymer blends. In the present work, we study the phase separation of a novel nanoparticle (NP)–polymer blend thin film system under shear using a soft-shear dynamic zone annealing (DZA-SS) method. The nanoparticles are densely grafted with polymer chains of chemically dissimilar composition from the matrix polymer, which induces phase separation upon thermal annealing into concentrated nanoparticle domains. We systematically examine the influence of DZA-SS translation speed and thus the effective shear rate on nanoparticle domain elongation and compare this with the counterpart binary polymer blend behavior. Unidirectionally aligned nanoparticle string-domains are fabricated in the presence of soft-shear in confined thin film geometry. We expect this DZA-SS method to be applicable to various NP–polymer blends towards unidirectionally aligned nanoparticle structures, which are important to functional nanoparticle structure fabrication.

Composition variation in Al-based dilute nitride alloys using apertureless scanning near-field optical microscopy

2016 ◽  
Vol 18 (44) ◽  
pp. 30546-30553 ◽  
Author(s):  
G. Kolhatkar ◽  
A. Boucherif ◽  
C. Dab ◽  
S. Fafard ◽  
V. Aimez ◽  
...  
Keyword(s):  
Refractive Index ◽  
Phase Separation ◽  
Optical Microscopy ◽  
Near Field ◽  
Dilute Nitride ◽  
Composition Variation ◽  
Nitride Alloys

Using apertureless scanning near-field optical microscopy to map refractive index variations, we study the phase separation in AlGaNAs alloys.

scholarly journals Late Stages of Phase Separation in a Binary Polymer Blend Studied by Rheology, Optical and Electron Microscopy, and Solid State NMR

1997 ◽  
Vol 30 (15) ◽  
pp. 4470-4480 ◽  
Author(s):  
Ioannis S. Polios ◽  
Maria Soliman ◽  
Chin Lee ◽  
Samuel P. Gido ◽  
Klaus Schmidt-Rohr ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Phase Separation ◽  
Solid State ◽  
Polymer Blend ◽  
Solid State Nmr ◽  
Optical And Electron Microscopy ◽  
Binary Polymer ◽  
Late Stages

Imaging phase-separated domains in conducting polymer blend films with near-field scanning optical microscopy

2001 ◽  
Vol 40 (22) ◽  
pp. 3737 ◽  
Author(s):  
Jeeseong Hwang ◽  
Lori S. Goldner ◽  
Alamgir Karim ◽  
Connie Gettinger
Keyword(s):  
Optical Microscopy ◽  
Conducting Polymer ◽  
Polymer Blend ◽  
Near Field ◽  
Blend Films ◽  
Scanning Optical Microscopy ◽  
Near Field Scanning

scholarly journals Phase separation in polyaniline with near-field scanning optical microscopy

1997 ◽  
Vol 36 (15) ◽  
pp. 3301 ◽  
Author(s):  
Pei-Kuen Wei ◽  
Jui-Hung Hsu ◽  
Wunshain Fann ◽  
Kuen-Ru Chuang ◽  
Hsun-Tsing Lee ◽  
...  
Keyword(s):  
Phase Separation ◽  
Optical Microscopy ◽  
Near Field ◽  
Scanning Optical Microscopy ◽  
Near Field Scanning
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