Poly(aryleneethynylene) Type Polymers Composed ofp-Phenylene and 2,5-Thienylene Units. Analysis of Polymerization Conditions and Terminal Group in Relation to the Mechanism of the Polymerization and Chemical and Optical Properties of the Polymer

1998 ◽  
Vol 31 (1) ◽  
pp. 7-14 ◽  
Author(s):  
Takakazu Yamamoto ◽  
Keisuke Honda ◽  
Naoki Ooba ◽  
Satoru Tomaru
Keyword(s):  
Optical Properties ◽  
Terminal Group ◽  
Polymerization Conditions

Synthesis of Well-defined Carbazole Group Labelled Polymer via RAFT Polymerization and Study on the Optical Properties

e-Polymers ◽  
2006 ◽  
Vol 6 (1) ◽  
Author(s):  
Di Zhou ◽  
Xiulin Zhu ◽  
Jian Zhu ◽  
Lihua Hu ◽  
Zhenping Cheng
Keyword(s):  
Optical Properties ◽  
Raft Polymerization ◽  
Chain Extension ◽  
Dimethyl Formamide ◽  
Coupling Scheme ◽  
H Nmr ◽  
Azo Polymer ◽  
Raft Agent ◽  
Carbazole Group ◽  
Polymerization Conditions

AbstractBenzyl 9H-carbazole-9-carbodithioate (BCC) was synthesized and characterized. The single-crystal structure of BCC was first reported. The RAFT polymerizations of styrene and acrylates using BCC as the RAFT agent under conventional polymerization conditions were investigated. The results showed that the BCC was an effective RAFT agent for the polymerizations of styrene and acrylates. The well-controlled polymers were labelled with carbazole group, which was confirmed by 1H NMR and the chain extension of the obtained polymer. Azo modified poly(methyl acrylate) (PMA) was synthesized through a postpolymerization azo-coupling scheme. The optical properties of obtained polymer were also characterized. The results showed that the carbazole group labelled polymer exhibited fluorescence and the azo polymer exhibited UV absorption behaviour in N,N-dimethyl formamide (DMF).

scholarly journals Influence of Terminal Group on Nonlinear Optical Properties of Fluorene Derivatives

2016 ◽  
Vol 32 (6) ◽  
pp. 1543-1548
Author(s):  
Li-Yun ZHAO ◽  
◽  
Yu-Jin ZHANG ◽  
Hong MA ◽  
Jian-Cai LENG ◽  
...  
Keyword(s):  
Optical Properties ◽  
Nonlinear Optical ◽  
Terminal Group ◽  
Nonlinear Optical Properties

Synthesis and Optical Properties of SERS-active Nanocomposite Microspheres

2007 ◽  
Vol 1024 ◽  
Author(s):  
Abdiaziz Farah ◽  
Sheng Dai ◽  
Baker Jawabrah Al-Hourani ◽  
Juan P. Bravo-Vasquez ◽  
Jae-Young Cho ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Particle Size ◽  
Optical Properties ◽  
Methacrylic Acid ◽  
Suspension Polymerization ◽  
Size Composition ◽  
Metal Nanoparticle ◽  
Au Nps ◽  
Optical And Electronic Properties ◽  
Polymerization Conditions

AbstractAn approach to prepare metal nanoparticle-polymer microbeads with integrated Raman tags using SERS as reliable diagnostic tool is reported. In essence, spectroscopically encoded (4-thioacetyl)styrenes were assembled on well-characterized 50 nm Au NPs and subjected to suspension polymerization conditions using styrene and methacrylic acid as comonomers and divinylbenzene as crosslinker. The resulting metal embedded nanocomposites were characterized by SEM, TEM, DSC, TGA, Raman and SERS to determine their morphology, particle size, composition, thermal stability and their optical and electronic properties.

Intramolecular charge-transfer emission from conjugated polymer nanoparticles: the terminal group effect on electronic and optical properties

2015 ◽  
Vol 6 (12) ◽  
pp. 2305-2311 ◽  
Author(s):  
Xiaofu Wu ◽  
Haibo Li ◽  
Yuxiang Xu ◽  
Hui Tong ◽  
Lixiang Wang
Keyword(s):  
Optical Properties ◽  
Charge Transfer ◽  
Conjugated Polymer ◽  
Intramolecular Charge Transfer ◽  
Terminal Group ◽  
Polymer Nanoparticles ◽  
Electronic And Optical Properties ◽  
The Core ◽  
Conjugated Polymer Nanoparticles ◽  
First Time

Efficient tuning of electronic and optical properties of conjugated polymer nanoparticles by intramolecular charge transfer between the core and the terminal groups is demonstrated for the first time.

New Strategies for the Fabrication of Enzyme Electrodes

1995 ◽  
Vol 414 ◽  
Author(s):  
K. Shridhara Alva ◽  
Lynne A. Samuelsont ◽  
Jayant Kumar ◽  
Kenneth A. Marx ◽  
David L. Kaplan ◽  
...  
Keyword(s):  
Optical Properties ◽  
Horseradish Peroxidase ◽  
Electrochemical Properties ◽  
Enzyme Electrodes ◽  
Electrochemical Copolymerization ◽  
Chemical Coupling ◽  
Bioanalytical Application ◽  
Glass Electrodes ◽  
Polymerization Conditions ◽  
New Strategies

AbstractThe electrochemical properties of o-dianisidine have been studied in both aqueous and organic solvents. This aryl diamine has been electrochemically polymerized on ITO coated glass electrodes and it was determined that the optical properties of these films are influenced by the polymerization conditions. The use of this polymer film as substrate for chemical coupling of biomaterials has been demonstrated with the light harvesting protein, phycoerythrin. Fabrication and bioanalytical application of enzyme electrodes by electrochemical copolymerization of odianisidine with the enzymes glucose oxidase and horseradish peroxidase, modified with odianisidineis described.

Optical properties and electronic structure of terminal group-perturbed ethynyl-linked dendrimers

2011 ◽  
Vol 161 (21-22) ◽  
pp. 2289-2294
Author(s):  
Peng Zhang ◽  
Wenting Xue ◽  
Pei Liu ◽  
Lihua Gan
Keyword(s):  
Optical Properties ◽  
Electronic Structure ◽  
Terminal Group

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).

Differential polarization imaging of sickled cells

1988 ◽  
Vol 46 ◽  
pp. 62-63
Author(s):  
Marcos F. Maestre
Keyword(s):  
Optical Properties ◽  
Theoretical Approach ◽  
Polarized Light ◽  
Polarization Microscopy ◽  
Spectroscopic Techniques ◽  
Polarization Imaging ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Microscopic Scale ◽  
Chiral Structures

Recently we have developed a form of polarization microscopy that forms images using optical properties that have previously been limited to macroscopic samples. This has given us a new window into the distribution of structure on a microscopic scale. We have coined the name differential polarization microscopy to identify the images obtained that are due to certain polarization dependent effects. Differential polarization microscopy has its origins in various spectroscopic techniques that have been used to study longer range structures in solution as well as solids. The differential scattering of circularly polarized light has been shown to be dependent on the long range chiral order, both theoretically and experimentally. The same theoretical approach was used to show that images due to differential scattering of circularly polarized light will give images dependent on chiral structures. With large helices (greater than the wavelength of light) the pitch and radius of the helix could be measured directly from these images.

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