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Online since: October 2008
Authors: Roman Nowak, Z. Gburski, A. Dawid, K. Górny, A. Piątek
The values used
in this work, 1.37 Å and 1.448 Å were taken from the quantum chemistry calculations [23].
Fig. 9 The radial distribution function of the centre of mass of K +@C60 molecule in the cluster For the low energy Et = -0.47 eV/molecule (solid phase) it shows two peaks associated with the pentagonal bipyramid structure of the cluster.
At the high energy Et = -0.17 eV/molecule the sharp peaks of g(r) shift and broaden out confirming the destruction of pentagonal bipyramid structure and liquification of the cluster.
Khanna, The Physics and Chemistry of Small Clusters, Plenum, New York, 1987 [11] R.
Fig. 9 The radial distribution function of the centre of mass of K +@C60 molecule in the cluster For the low energy Et = -0.47 eV/molecule (solid phase) it shows two peaks associated with the pentagonal bipyramid structure of the cluster.
At the high energy Et = -0.17 eV/molecule the sharp peaks of g(r) shift and broaden out confirming the destruction of pentagonal bipyramid structure and liquification of the cluster.
Khanna, The Physics and Chemistry of Small Clusters, Plenum, New York, 1987 [11] R.
Online since: June 2017
Authors: Rakchart Traiphol, Ruttayapon Potai
Effect of Solvents on Controlling the Photophysical Properties
of Poly[2-Methoxy-5-(2’-Ethylhexyloxy)-1,4-Phenylenevinylene] (MEH-PPV) Nanoparticle
Ruttayapon Potai1,a and Rakchart Traiphol2,b
1Division of Chemistry, Faculty of Science, Nakhon Phanom University,
Nakhon Phanom 48000, Thailand
2Program in Materials Science and Engineering, Faculty of Science, Mahidol University,
Rama 6 Road, Ratchathewi, Bangkok 10400, Thailand
aruttayaponpotai@npu.ac.th, brakchart.tra@mahidol.ac.th
Keywords: conjugated polymer nanoparticle, solvent effect, photophysics
Abstract.
Introduction Poly[2-methoxy-5-(2’-ethyl-hexyloxy)-1,4-phenylene vinylene] (MEH-PPV) (see structure in Fig. 2b) is one type of conjugated polymer that has attracted much attention because of its excellent electro-optical properties.
This is due to the difference of polymer chain packing, including collapsed chain, some of agglomerate and aggregate site. [8] Fig. 2 (a) Absorption spectra and (b) PL spectra of MEH-PPV nanoparticles prepared from different types of initial solvents (Inserted is MEH-PPV structure).
RP also thanks to Department of Chemistry, Faculty of Science, Naresuan University for supporting some facilities.
Introduction Poly[2-methoxy-5-(2’-ethyl-hexyloxy)-1,4-phenylene vinylene] (MEH-PPV) (see structure in Fig. 2b) is one type of conjugated polymer that has attracted much attention because of its excellent electro-optical properties.
This is due to the difference of polymer chain packing, including collapsed chain, some of agglomerate and aggregate site. [8] Fig. 2 (a) Absorption spectra and (b) PL spectra of MEH-PPV nanoparticles prepared from different types of initial solvents (Inserted is MEH-PPV structure).
RP also thanks to Department of Chemistry, Faculty of Science, Naresuan University for supporting some facilities.
Online since: January 2013
Authors: Mei Hua Huang, Zong Fang Tian, Hui Huang
Synthesis and photovoltaic properties of poly(p-phenylenevinylene) derivatives modified by thiophene derivatives
MeiHua Huang1,a ZongFang Tian1, Hui Huang1
1 College of Chemistry and Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, Xiangtan University, Xiangtan 411105, P R China
a xtuhmh@163.com
Keywords: polymer solar cells; poly(p-phenylenevinylene) derivatives; thiophene derivatives; 3,4-ethylenedioxythiophene; 1,3,4-oxadiazole
Abstract.
In order to broaden the absorption spectrum and improve the mobility of charge carriers, fruitful endeavors have been done in modifying the chemical structures of PPV derivatives [6].
The employed device structure is ITO/PEDOT: PSS/polymer: PCBM(1:4 w/w) /Ca (10 nm)/Al (150 nm).
In order to broaden the absorption spectrum and improve the mobility of charge carriers, fruitful endeavors have been done in modifying the chemical structures of PPV derivatives [6].
The employed device structure is ITO/PEDOT: PSS/polymer: PCBM(1:4 w/w) /Ca (10 nm)/Al (150 nm).
Online since: October 2011
Authors: Qing Bo Yu, Xian Hua Li, Yu Lun Tao, Guo Jun Cheng
The Characteristic Research of Two Kinds of Block Polymer
Qingbo Yu1,a, Xianhua Li2,b, Yulun Tao3 and Guojun Cheng1
1School of Materials Science and Engineering, Anhui University of Science and Technology, Huainan, Anhui, China
2School of Mechanical Engineering, Anhui University of Science and Technology, Huainan, Anhui, China
3School of Chemistry and Chemical Engineering, Anhui University, Hefei, Anhui, China
ayuqingbo007@163.com, bxhli01@163.com
Keywords: character of polymerization, block copolymers, top monomer conversion
Abstract.
Introduction Controlled/living free radical polymerizations, as one of the hotspots in the field of polyme synthesis, have many advantages, such as preparing polymer with scheduled structure by the choosing of polymerization system or the controlling of polymerization conditions, possessing broad choices of monomer and mild reaction condition, involving suspension or emulsion polymerization in the water.
Since American chemist Szwarc[1] first put forward the concept of active polymerization, polymer chemistry has entered the era of molecular design.
The product structures were characterized by 1H NMR spectra as shown in Fig. 1.
Introduction Controlled/living free radical polymerizations, as one of the hotspots in the field of polyme synthesis, have many advantages, such as preparing polymer with scheduled structure by the choosing of polymerization system or the controlling of polymerization conditions, possessing broad choices of monomer and mild reaction condition, involving suspension or emulsion polymerization in the water.
Since American chemist Szwarc[1] first put forward the concept of active polymerization, polymer chemistry has entered the era of molecular design.
The product structures were characterized by 1H NMR spectra as shown in Fig. 1.
Investigation of Genotoxicity of Gold Nanoparticles Prepared by the Electric Spark Dispersion Method
Online since: September 2014
Authors: Evgenii Plotnikov, Andrew Gapeyev, Vladimir Plotnikov, Sergey P. Zhuravkov, Dmitry Martemiyanov
New properties of the particles directly related not only to the size but also their structure, properties of the medium in which they are prepared methods of preparation.
Adult male BALB/c mice (2 months of age, 22–25 g in body weight) were purchased from the Laboratory Animal Breeding Facility (Branch of Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Pushchino, Moscow Region, Russia) and used in all experiments.
All manipulations with the animals were conducted in accordance with experimental protocols approved by the Local Animal Care and Use Committee (Branch of Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Pushchino, Moscow Region, Russia).
Chemeris, Changes in the chromatin structure of lymphoid cells under the influence of low-intensity extremely high-frequency electromagnetic radiation against the background of inflammatory process, Biophysics, 4 (2011) 672-678
Adult male BALB/c mice (2 months of age, 22–25 g in body weight) were purchased from the Laboratory Animal Breeding Facility (Branch of Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Pushchino, Moscow Region, Russia) and used in all experiments.
All manipulations with the animals were conducted in accordance with experimental protocols approved by the Local Animal Care and Use Committee (Branch of Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Pushchino, Moscow Region, Russia).
Chemeris, Changes in the chromatin structure of lymphoid cells under the influence of low-intensity extremely high-frequency electromagnetic radiation against the background of inflammatory process, Biophysics, 4 (2011) 672-678
Online since: March 2017
Authors: Mohd Ambar Yarmo, Wan Zurina Samad, Noraini Hamzah
Influence of the Calcination Temperature on the Catalytic Properties
of Os/Bentonite for Glycerol Hydrogenolysis
Noraini HAMZAH1,a*, Wan Zurina ABD SAMAD2,b and Mohd Ambar YARMO3,c
1Faculty of Applied Sciences, University of Technology MARA, 40450 Shah Alam, Selangor Darul Ehsan, Malaysia
2Department of Chemistry,Kulliyah of Science,International Islamic University Malaysia, IIUM,Kampus Kuantan, Jalan Sultan Ahmad Shah, Bandar Indera Mahkota, 25200 KuantanPahangDarul Makmur, Malaysia
3Faculty of Science and Food Technology, Universiti Kebangsaan Malaysia ,43600 Bangi, Selangor Darul Ehsan, Malaysia
apnoraini@salam.uitm.edu.my,bwzurina@iium.edu.my, cambar.y@gmail.com
Keywords : Calcination temperature, Hydrogenolysis glycerol, Os/bentonite catalyst
Abstract.
It has a layered structure, large surface areas and cation exchange capacity.
Fig.4 TPR profile of Os/bentonite catalyst at different calcination temperature The sheet-like structure of montmorillonite can be seen in FESEM image as shown in Fig. 5.
Vidyarthi, Effect of catalyst constituents on (Ni, Mo, and Cu)/Kieselguhr-catalyzed sucrose hydrogenolysis, Industrial and Engineering Chemistry Research, 44(5) (2005) 1466-1473
It has a layered structure, large surface areas and cation exchange capacity.
Fig.4 TPR profile of Os/bentonite catalyst at different calcination temperature The sheet-like structure of montmorillonite can be seen in FESEM image as shown in Fig. 5.
Vidyarthi, Effect of catalyst constituents on (Ni, Mo, and Cu)/Kieselguhr-catalyzed sucrose hydrogenolysis, Industrial and Engineering Chemistry Research, 44(5) (2005) 1466-1473
Online since: September 2013
Authors: Xiao Xia Sun, Xiao Xiao Zhuang, Yu Hu
Synthesis, Characterization of novel π-conjugated polymers acceptor 5,6-bis(heptyloxy)benzo[c][1,2,5]thiadiazole
SUN Xiaoxia1,a*, ZHUANG Xiaoxiao1,b, HU Yu2,c*
1Jiangxi Key Laboratory of Organic Chemistry, Jiangxi Science and Technology Normal University,
Nanchang 330013, People’s Republic of China
2Experimental Chemistry Center, Nanchang University, Nanchang 330031, Jiangxi Province,
China
asunxiaoxia77@126.com; bzhuangxiaoxiao1987@163.com; chuyu@ncu.edu.cn
Keywords: Low-Bandgap; Donor-acceptor; 5,6-bis(heptyloxy)benzo[c][1,2,5]thiadiazole
Abstract: Monomers based on 2,1,3-benzothiadiazole bearing solubilizing side chains have been synthesized in high yields over four steps from readily available starting materials.
Figure 1 Structures of BT, BBT, TQ, DOBT While using the donor-acceptor approach in the context of soluble electrochromic (EC) polymer design, we have recently demonstrated that color states commonly difficult to achieve in π-conjugated polymers, such as greens of tunable hues, could be achieved relying on a two-band absorption in the visible attainable on the basis of a linear combination of well-chosen electron-rich (donor) and electron-deficient (acceptor) building units. 2,1,3- Benzothiadiazole (BT) and benzo[1,2-c;4,5-c′]bis[1,2,5]thiadiazole (BBT) are electron-accepting heterocycle that have been utilized to construct some n-type semiconducting polymers showing high electron mobility.
The structures of the monomer 4 were characterized by 1H NMR spectroscopy.
Figure 1 Structures of BT, BBT, TQ, DOBT While using the donor-acceptor approach in the context of soluble electrochromic (EC) polymer design, we have recently demonstrated that color states commonly difficult to achieve in π-conjugated polymers, such as greens of tunable hues, could be achieved relying on a two-band absorption in the visible attainable on the basis of a linear combination of well-chosen electron-rich (donor) and electron-deficient (acceptor) building units. 2,1,3- Benzothiadiazole (BT) and benzo[1,2-c;4,5-c′]bis[1,2,5]thiadiazole (BBT) are electron-accepting heterocycle that have been utilized to construct some n-type semiconducting polymers showing high electron mobility.
The structures of the monomer 4 were characterized by 1H NMR spectroscopy.
Online since: January 2016
Authors: Sasimonton Moungsrijun, Supphadate Sujinnapram
Due to slow reaction rate, fine structure is formed according relation [5];
KOH « K+ + OH- (1)
ZnO + 2OH- « ZnO22- + H2O (2)
ZnO22- + H2O « [Zn(OH)4]2- (3)
[Zn(OH)4]2- « Zn(OH)2 + 2OH- (4)
Zn(OH)2 « Zn2+ + 2OH- (5)
Fig. 1.
Cahen, Surface Photovoltage Spectroscopy of Dye-Sensitized Solar Cells with TiO2, Nb2O5, and SrTiO3 Nanocrystalline Photoanodes: Indication for Electron Injection from Higher Excited Dye States, The Journal of Physical Chemistry B, 105 (2001) 6347-6352
Huang, Integrating Surface Textures on ZnO Substrate for High Light Extraction Efficiency Light-Emitting Diode, The Journal of Physical Chemistry C, 118 (2014) 14894-14898
Chen, Investigation of iodine dopant amount effects on dye-sensitized hierarchically structured ZnO solar cells, Materials Research Bulletin, 55 (2014) 182-189.
Cahen, Surface Photovoltage Spectroscopy of Dye-Sensitized Solar Cells with TiO2, Nb2O5, and SrTiO3 Nanocrystalline Photoanodes: Indication for Electron Injection from Higher Excited Dye States, The Journal of Physical Chemistry B, 105 (2001) 6347-6352
Huang, Integrating Surface Textures on ZnO Substrate for High Light Extraction Efficiency Light-Emitting Diode, The Journal of Physical Chemistry C, 118 (2014) 14894-14898
Chen, Investigation of iodine dopant amount effects on dye-sensitized hierarchically structured ZnO solar cells, Materials Research Bulletin, 55 (2014) 182-189.
Online since: February 2016
Authors: Valentina Sokhoreva, Natalya A. Dubrova, Akbota Dyussembekova
The study of changing the intermixture structure was also conducted.
Ershov, Radiation chemistry of polymers, High Energy Chem. 43 (1) (2009) 1-8
Dahlan, Radiation grafted poly(vinylidene fluoride)-graftpolystyrene sulfonic acid membranes for fuel cells: structure-property relationships, Chin.
Ziaie, Radiation grafting of styrene onto polypropylene fibres by a 10 MeV electron beam, Radiation physics chemistry 76 (5) (2007) 787-793
Ershov, Radiation chemistry of polymers, High Energy Chem. 43 (1) (2009) 1-8
Dahlan, Radiation grafted poly(vinylidene fluoride)-graftpolystyrene sulfonic acid membranes for fuel cells: structure-property relationships, Chin.
Ziaie, Radiation grafting of styrene onto polypropylene fibres by a 10 MeV electron beam, Radiation physics chemistry 76 (5) (2007) 787-793
Online since: April 2016
Authors: Jarmila Geffertova, Anton Geffert, Blazej Seman
The Problems in Delignification of Dry Wood
by Kraft Process
Anton Geffert1,a*, Jarmila Geffertova1,b and Blazej Seman1,c
1Technical University in Zvolen, Faculty of Wood Sciences and Technology,
Department of Chemistry and Chemical Technologies, T.G.
Penetration and diffusion of cooking liquor into structure of the fibre wall where delignification reactions take place, are affected by fibre morphology.
Požgaj et al., Štruktúra a vlastnosti dreva (Wood structure and properties), second ed., Svornosť, Bratislava, 1997
Sjöström, Wood chemistry : fundamentals and applications, second ed., Academic Press, San Diego, 1993
Penetration and diffusion of cooking liquor into structure of the fibre wall where delignification reactions take place, are affected by fibre morphology.
Požgaj et al., Štruktúra a vlastnosti dreva (Wood structure and properties), second ed., Svornosť, Bratislava, 1997
Sjöström, Wood chemistry : fundamentals and applications, second ed., Academic Press, San Diego, 1993