scholarly journals Tailoring the optical properties of poly(3-hexylthiophene) by emulsion processing using polymeric macrosurfactants

2015 ◽  
Vol 3 (9) ◽  
pp. 2065-2071 ◽  
Author(s):  
F. D. Fleischli ◽  
N. Ghasdian ◽  
T. K. Georgiou ◽  
N. Stingelin
Keyword(s):  
Optical Properties ◽  
Molecular Aggregation ◽  
Water Dispersion ◽  
Emulsion Processing

Here we demonstrate that the use of macrosurfactants in the production of poly(3-hexylthiophene) (P3HT):water dispersion allows to drastically change the semiconductor's molecular aggregation, leading to pronounced H- or J-like behaviour depending on the macrosurfactant used and the conditions selected to produce the dispersions.

scholarly journals Study of the colloidal stability and optical properties of sunscreen creams

2019 ◽  
Vol 44 (2) ◽  
pp. 26 ◽  
Author(s):  
Gustavo Pereira Saito ◽  
Mariana Bizari ◽  
Marco Aurélio Cebim ◽  
Marcos Antonio Correa ◽  
Miguel Jafelicci Junior ◽  
...  
Keyword(s):  
Optical Properties ◽  
Absorption Spectra ◽  
Colloidal Stability ◽  
Time Dependent ◽  
Water Dispersion ◽  
Cosmetic Product ◽  
Critical Wavelength ◽  
Oil Water ◽  
Cielab Color

Sunscreen formulations containing inorganic/organic filters or mixture of them were synthesized by oil/water dispersion. The viscosity measurements show that sunscreen formulations are time-dependent non-newtonian fluids. In the CIELab color diagram, the white and/or beige colors presented by formulations do not compromise the aesthetics of the cosmetic product. UV-VIS absorption spectra show that sunscreen creams have high UV shielding ability, mainly the formulations containing inorganic and organic filters mixtures, which provide in vitro SPF and critical wavelength values recommended for UV protection.

Temperature-Tuning of Optical Properties and Molecular Aggregation in AnE-PVstat Copolymer Solution

2018 ◽  
Vol 122 (7) ◽  
pp. 3965-3969 ◽  
Author(s):  
A. Saaidia ◽  
M. A. Saidani ◽  
E. Hleli ◽  
S. Alam ◽  
C. Ulbricht ◽  
...  
Keyword(s):  
Optical Properties ◽  
Molecular Aggregation ◽  
Copolymer Solution ◽  
Temperature Tuning

Study of Optical Properties and Molecular Aggregation of Conjugated Low Band Gap Copolymers: PTB7 and PTB7-Th

2015 ◽  
Vol 119 (43) ◽  
pp. 24643-24648 ◽  
Author(s):  
Fatima Bencheikh ◽  
David Duché ◽  
Carmen M. Ruiz ◽  
Jean-Jacques Simon ◽  
Ludovic Escoubas
Keyword(s):  
Optical Properties ◽  
Band Gap ◽  
Molecular Aggregation ◽  
Low Band Gap

9-Anthryl-capped DPP-based dyes: aryl spacing induced differential optical properties

2016 ◽  
Vol 4 (34) ◽  
pp. 8006-8013 ◽  
Author(s):  
Shian Ying ◽  
Mingshuai Chen ◽  
Zhongwei Liu ◽  
Kai Zhang ◽  
Yuyu Pan ◽  
...  
Keyword(s):  
Optical Properties ◽  
Fluorescence Properties ◽  
Molecular Aggregation ◽  
Aggregation Behaviors

The conjugation bridges of DPP derivatives could significantly tune and alter molecular aggregation behaviors and fluorescence properties.

scholarly journals Spectral properties of tetraanionic porphyrin in formamide colloids of layered double hydroxides

2008 ◽  
Vol 6 (4) ◽  
pp. 569-574 ◽  
Author(s):  
Juraj Bujdák ◽  
Nobuo Iyi
Keyword(s):  
Optical Properties ◽  
Layered Double Hydroxides ◽  
Visible Region ◽  
Colloidal Suspensions ◽  
Soret Band ◽  
Molecular Aggregation ◽  
Detailed Characterization ◽  
Intensity Changes ◽  
Two Peaks ◽  
Double Hydroxides

AbstractFormamide colloidal suspensions of layered double hydroxides (LDHs) with anionic dye, meso-tetrakis(4-sulfonatophenyl)porphine (TPPS) were prepared. Optical properties of these suspensions were investigated by means of absorption and fluorescence spectroscopies in the visible region. For more detailed characterization, second derivative curves of the spectra were calculated. The adsorption of the dye on LDH nanosheets led to partial molecular aggregation, reflected in significant changes of the dye optical properties. The Soret band in the absorption spectra was split into two peaks and decreased in intensity. Changes were observed also for the Q-bands. The molecular aggregation significantly quenched the emission of the dye. The low intensity emission from dye H-aggregates was identified at slightly longer wavelengths. The molecular aggregation increased with the dye/LDH ratio. At low dye loadings, the optical properties were very similar to the dye solution. The yields of the dye molecular aggregation increased with LDH surface charge.

Photoisomerizable azobenzene dyes incorporated into polymers and dendrimers. Influence of the molecular aggregation on the nonlinear optical properties

2021 ◽  
pp. 109551
Author(s):  
Fabián Cuétara-Guadarrama ◽  
Mireille Vonlanthen ◽  
Kendra Sorroza-Martínez ◽  
Israel González-Méndez ◽  
Ernesto Rivera
Keyword(s):  
Optical Properties ◽  
Nonlinear Optical ◽  
Nonlinear Optical Properties ◽  
Molecular Aggregation

Controllable Supramolecular Architectures for Modulating Optical Properties on the Molecular Aggregation Level

2014 ◽  
Vol 2014 (23) ◽  
pp. 5004-5009 ◽  
Author(s):  
Runsheng Jiang ◽  
Zheng Xue ◽  
Yongjun Li ◽  
Zhihong Qin ◽  
Yuliang Li ◽  
...  
Keyword(s):  
Optical Properties ◽  
Molecular Aggregation ◽  
Supramolecular Architectures ◽  
Aggregation Level

Design of objective lens for 200-kV high-resolution electron microscopes

1983 ◽  
Vol 41 ◽  
pp. 314-315
Author(s):  
K. Tsuno ◽  
T. Honda ◽  
Y. Harada ◽  
M. Naruse
Keyword(s):  
Optical Properties ◽  
Computer Technology ◽  
Axial Magnetic Field ◽  
Chromatic Aberration ◽  
Objective Lens ◽  
Resolution Electron ◽  
Correction Of Astigmatism ◽  
Three Stages ◽  
Electron Microscopes ◽  
Stage 1

Developement of computer technology provides much improvements on electron microscopy, such as simulation of images, reconstruction of images and automatic controll of microscopes (auto-focussing and auto-correction of astigmatism) and design of electron microscope lenses by using a finite element method (FEM). In this investigation, procedures for simulating the optical properties of objective lenses of HREM and the characteristics of the new lens for HREM at 200 kV are described.The process for designing the objective lens is divided into three stages. Stage 1 is the process for estimating the optical properties of the lens. Firstly, calculation by FEM is made for simulating the axial magnetic field distributions Bzc of the lens. Secondly, electron ray trajectory is numerically calculated by using Bzc. And lastly, using Bzc and ray trajectory, spherical and chromatic aberration coefficients Cs and Cc are numerically calculated. Above calculations are repeated by changing the shape of lens until! to find an optimum aberration coefficients.

Optical Properties of HVEM Accelerators

1975 ◽  
Vol 33 ◽  
pp. 180-181
Author(s):  
A. Strojnik ◽  
J.W. Scholl ◽  
V. Bevc
Keyword(s):  
Optical Properties ◽  
Electron Accelerator ◽  
Systematic Investigation ◽  
Electron Source ◽  
High Brightness ◽  
The Past ◽  
Wide Range ◽  
Optical Behavior

The electron accelerator, as inserted between the electron source (injector) and the imaging column of the HVEM, is usually a strong lens and should be optimized in order to ensure high brightness over a wide range of accelerating voltages and illuminating conditions. This is especially true in the case of the STEM where the brightness directly determines the highest resolution attainable. In the past, the optical behavior of accelerators was usually determined for a particular configuration. During the development of the accelerator for the Arizona 1 MEV STEM, systematic investigation was made of the major optical properties for a variety of electrode configurations, number of stages N, accelerating voltages, 1 and 10 MEV, and a range of injection voltages ϕ0 = 1, 3, 10, 30, 100, 300 kV).

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