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Online since: December 2012
Authors: Li Chun Hu, Hong Wei Zhao
This article focuses on the impact of Ag doping on the parent structure, magnetic properties and magnetoresistance.
Results and Discussion Fig.1.The diffraction patterns for powder samples of Agx-d-La0.6Sr0.15Na0.1Agd0.15-dMnO3,where is the characteristic peaks of Ag phase: A1,x=0.00; A2,x=0.016;A3,x=0.040;A4,x=0.100 Phase Structure of Powder Samples.
Conclusions We studied the polycrystalline sample Agx-d-La0.6Sr0.15Na0.1Agd0.15-dMnO3 with phase structure, magnetic properties and magnetoresistance and came to the conclusion: When x = 0.016, within the temperature range of 250K- 293 K, the MR maintains 6.0% (± 0.2%); When x = 0.040, within the temperature range of 207K- 286 K, the MR maintains 5.08% (± 0.2%); When x = 0.100, within the temperature range of 205K- 272K, the MR maintains 5.0% (± 0.33%).So, in this series of temperature zone, magnetoresistance temperature stability of samples has been improved.
[J]Physics and Chemistry of Solids,2003(64):2063 [12] R Shreekala, M Rajeswari,et al.
Results and Discussion Fig.1.The diffraction patterns for powder samples of Agx-d-La0.6Sr0.15Na0.1Agd0.15-dMnO3,where is the characteristic peaks of Ag phase: A1,x=0.00; A2,x=0.016;A3,x=0.040;A4,x=0.100 Phase Structure of Powder Samples.
Conclusions We studied the polycrystalline sample Agx-d-La0.6Sr0.15Na0.1Agd0.15-dMnO3 with phase structure, magnetic properties and magnetoresistance and came to the conclusion: When x = 0.016, within the temperature range of 250K- 293 K, the MR maintains 6.0% (± 0.2%); When x = 0.040, within the temperature range of 207K- 286 K, the MR maintains 5.08% (± 0.2%); When x = 0.100, within the temperature range of 205K- 272K, the MR maintains 5.0% (± 0.33%).So, in this series of temperature zone, magnetoresistance temperature stability of samples has been improved.
[J]Physics and Chemistry of Solids,2003(64):2063 [12] R Shreekala, M Rajeswari,et al.
Online since: March 2018
Authors: Cheng Bo Cao, Qian Wang, Ke Gong, Jing Guo, Xiao Jiao Wang
An Improved Method for the Preparation for New Antibacterial Dressing Crosslinked with Carboxymethyl Chitosan
Qian Wang1,a, Ke Gong1,b, Chengbo Cao1,2,c*, Jing Guo3, *, Xiaojiao Wang1,e
1School of Chemistry and Chemical Engineering, Shandong University, Jinan, China, 250100
2Institute of Light Textile and Medical Materials, Shandong University, Jinan, China, 250061
3School of Stomatology, Shandong University, Jinan, China 250012
aanne_miss@foxmail.com, b757631535@qq.com, ccbcao@sdu.edu.cn
dguojing777@tom.com, ewang99118@163.com
Keywords: Acellular dermal matrix, Antibacterial, Dressing, Carboxymethyl chitosan
Abstract.
At the same time, scanning electron microscopy showed that the structure of AADM was evacuated and the pores were interconnected.
This is mainly because the keratinase destroys the natural network structure of collagen when keratinase dosage is more than 0.3%, resulting in the structure is too loose.
At the same time, scanning electron microscopy showed that the structure of AADM was evacuated and the pores were interconnected.
This is mainly because the keratinase destroys the natural network structure of collagen when keratinase dosage is more than 0.3%, resulting in the structure is too loose.
Online since: October 2011
Authors: Kimi Melody, Yuliati Leny, Mustaffa Shamsuddin
Preparation and Characterizations of In0.1SnxZn0.85-2xS Powder Photocatalysts for Hydrogen Production under Visible Light Irradiation
MELODY Kimi1,a, LENY Yuliati2,b*, and Mustaffa Shamsuddin1,c
1Department of Chemistry, Faculty of Science,
Universiti Teknologi Malaysia, 81310 UTM Skudai, Johor, Malaysia
2Ibnu Sina Institute for Fundamental Science Studies,
Universiti Teknologi Malaysia, 81310 UTM Skudai, Johor, Malaysia
amelodykeys@gmail.com, b*leny@ibnusina.utm.my, cmustaffas@utm.my
Keywords: Photocatalyst, solid solution, In0.1SnxZn0.85-2xS, hydrogen, visible light
Abstract.
The structures, optical properties and morphologies of the solid solutions were studied by X-ray diffraction, diffuse reflectance UV–visible spectroscopy and field emission scanning electron microscopy.
Results and Discussion Crystal Structure.
In addition to the crystal structure, the optical properties of the prepared samples were also compared, as shown in Fig. 2 [A].
The structures, optical properties and morphologies of the solid solutions were studied by X-ray diffraction, diffuse reflectance UV–visible spectroscopy and field emission scanning electron microscopy.
Results and Discussion Crystal Structure.
In addition to the crystal structure, the optical properties of the prepared samples were also compared, as shown in Fig. 2 [A].
Online since: December 2014
Authors: Chao Pan, Li Dong, Hai Teng Gu
The hierarchical nanocomposite structures of PANI@MnO2/Graphene oxide were further proved by XRD, SEM and TEM measurements.
For example, binary or ternary composites of nanostructured PANI/carbonacenous materials (ca. graphene, carbon nanotube or carbon nanofibers) and MnO2 have been investigated to utilize their advantages and overcome their disadvantages in supercapacitors. [21]It is expected that decorating MnO2 on PANI/Graphene nanostructures would generate ternary coaxial structures with improved electrochemical utilization of PANI by providing large interaction area between the active materials and electrolyte.
The PMGOs composites electrodes were prepared by mixing PMGOs powder, carbon black (CB) and poly(tetrafluoroethylene) emulsion (CAS No: 9002-84-0, Aladdin Chemistry Co.
The SEM image (Fig. 3b) illustrated the free-standing wire-like structures of PANI nanowires with 70-90 nm in diameter and a few hundred nanometers in length.
For example, binary or ternary composites of nanostructured PANI/carbonacenous materials (ca. graphene, carbon nanotube or carbon nanofibers) and MnO2 have been investigated to utilize their advantages and overcome their disadvantages in supercapacitors. [21]It is expected that decorating MnO2 on PANI/Graphene nanostructures would generate ternary coaxial structures with improved electrochemical utilization of PANI by providing large interaction area between the active materials and electrolyte.
The PMGOs composites electrodes were prepared by mixing PMGOs powder, carbon black (CB) and poly(tetrafluoroethylene) emulsion (CAS No: 9002-84-0, Aladdin Chemistry Co.
The SEM image (Fig. 3b) illustrated the free-standing wire-like structures of PANI nanowires with 70-90 nm in diameter and a few hundred nanometers in length.
Online since: June 2014
Authors: Jorge Salguero Gómez, Francisco Javier Botana, Mariano Marcos Bárcena, Juan Manuel Vazquez Martinez, Severo Raúl Fernández-Vidal, Álvaro Gómez-Parra
Ramón Puyol s/n, E-11202, Algeciras, Cádiz (SPAIN)
3Materials Science and Inorganic Chemistry Dept.
A great variety of surface structures with different properties can be adapted to the most demanding requirements.
Surface radiation was carried out under non-protective atmosphere with the aim of favoring the thermal oxidation of the external layers of the material structure, thereby increasing the content of stoichiometry titanium oxide (TiO2), with application conditions like specified in Table 1.
[mm] Ø Spot [μm] 8 70 40-150 1062 Air 185 60 The alloy samples treatment was carried out under oxidative atmosphere of air with the purpose of favoring the thermal oxidation of the external layers of the material structure, thereby increasing the content of stoichiometry titanium oxide TiO2.
A great variety of surface structures with different properties can be adapted to the most demanding requirements.
Surface radiation was carried out under non-protective atmosphere with the aim of favoring the thermal oxidation of the external layers of the material structure, thereby increasing the content of stoichiometry titanium oxide (TiO2), with application conditions like specified in Table 1.
[mm] Ø Spot [μm] 8 70 40-150 1062 Air 185 60 The alloy samples treatment was carried out under oxidative atmosphere of air with the purpose of favoring the thermal oxidation of the external layers of the material structure, thereby increasing the content of stoichiometry titanium oxide TiO2.
Online since: September 2014
Authors: Bo Li
This article first defines the meaning of educational technology and the ability of educational technology is divided into five levels, and the hierarchical structure of a rational argument; then to primary and secondary schools in the region for the sample of students and teachers conducted a survey to find out the ability of educational technology in the school and their teachers feedback on the training focuses on the training mode, this proposed training program for school teachers.
Five point two Features the ability to structure educational technology According to the above analysis of educational technology ability, the author will be summarized in the following characteristics: First, the ability to have a strong educational technology openness.
The so-called principle of appropriateness, is the structure of the educational skills of force only in a general sense to define a range of primary and secondary school teachers on, but also practical training in various schools according to different conditions, the focus should be different, according to local conditions not across the board.
Five point three Case studies of Education Technical Capacity of Primary and secondary schools Teacher The survey of 135 questionnaires were returned 98 response rate of 73%, 92 copies of valid questionnaires, efficiency of 71%, including 50 junior distributed copies to recover the 38; school distributed 45 copies, 30 copies of recovery; primary payment 40 parts recovered 30 parts; investigations involving ordinary, focusing on eight nearly 200 primary and secondary school teachers were randomly distributed in the form of a questionnaire at each school, covering language, mathematics, chemistry, English, politics, biology and other disciplines eight More than 100 teachers; so this is a representative sample of the whole school.
Five point two Features the ability to structure educational technology According to the above analysis of educational technology ability, the author will be summarized in the following characteristics: First, the ability to have a strong educational technology openness.
The so-called principle of appropriateness, is the structure of the educational skills of force only in a general sense to define a range of primary and secondary school teachers on, but also practical training in various schools according to different conditions, the focus should be different, according to local conditions not across the board.
Five point three Case studies of Education Technical Capacity of Primary and secondary schools Teacher The survey of 135 questionnaires were returned 98 response rate of 73%, 92 copies of valid questionnaires, efficiency of 71%, including 50 junior distributed copies to recover the 38; school distributed 45 copies, 30 copies of recovery; primary payment 40 parts recovered 30 parts; investigations involving ordinary, focusing on eight nearly 200 primary and secondary school teachers were randomly distributed in the form of a questionnaire at each school, covering language, mathematics, chemistry, English, politics, biology and other disciplines eight More than 100 teachers; so this is a representative sample of the whole school.
Online since: October 2006
Authors: Sang Ll Lee, Jin Kyung Lee, Kwang Hyun Lee, Byung Won Kang, Byung Chul Kang, Jong Baek Lee
Thermal Properties of a Liquid-crystalline Polyurethanes
Containing Biphenyl Mesogen
Jong-Back Lee1,a, Kwang-Hyun Lee1,b, Byung-Chul Kang1,c,
Byung-Won Kang2,d, Sang-Pill Lee3,e and Jin-Kyung Lee3,f
1Department of Chemical Engineering, Dong-Eui University, 995, Eomgwangno,
Busanjin-Gu, Busan, 614-714, Korea
2Department of Chemistry, Dong-Eui University, 995, Eomgwangno, Busanjin-Gu,
Busan, 614-714, Korea
3Department of Mechanical Engineering, Dong-Eui University, 995, Eomgwangno,
Busanjin-Gu, Busan, 614-714, Korea
ajblee@deu.ac.kr, bkhlee@deu.ac.kr, cbckang@deu.ac.kr, dbwkang@deu.ac.kr, esplee@deu.ac.kr, fjklee@deu.ac.kr
Keywords: polyurethane. diisocyanate. mesophase. nematic phase. hydrogen bonding.
The structure of the monomer and the corresponding polymers were confirmed FT-IR and 1H NMR spectroscopic methods.
Introduction Recent work in the field of thermotropic liquid crystal polymers, and the introduction into the commercial market of various polymers of this type has shown that in order to achieve high performance characteristics with regards to mechanical and thermal properties the polymers should most often have an all-aromatic structure [1,2].
This paper presents some of our results on the synthesis and structure of thermotropic main chain liquid crystalline polyurethanes based 4,4'-bis(11-hydroxyundeyloxy)biphenyl.
The structure of the monomer and the corresponding polymers were confirmed FT-IR and 1H NMR spectroscopic methods.
Introduction Recent work in the field of thermotropic liquid crystal polymers, and the introduction into the commercial market of various polymers of this type has shown that in order to achieve high performance characteristics with regards to mechanical and thermal properties the polymers should most often have an all-aromatic structure [1,2].
This paper presents some of our results on the synthesis and structure of thermotropic main chain liquid crystalline polyurethanes based 4,4'-bis(11-hydroxyundeyloxy)biphenyl.
Online since: July 2025
Authors: Intan Syahbanu, Siti Qomariah, Irene Utami
The structure is presented at Fig.3 [17].
Fig. 3 Curcumin structure at pH 9 [17] Turmeric has good antioxidant activity.
Curcumin has tautomery structure.
In basic condition, curcumin tends to undergo enol tautomer structure [18].
Momin, “Structure activity relationship of tautomers of curcumin: a review,” Ukr.
Fig. 3 Curcumin structure at pH 9 [17] Turmeric has good antioxidant activity.
Curcumin has tautomery structure.
In basic condition, curcumin tends to undergo enol tautomer structure [18].
Momin, “Structure activity relationship of tautomers of curcumin: a review,” Ukr.
Online since: September 2013
Authors: Wei Yin
Due to the precursors of the molecular sieve self-assembles basing on these micelles; there exists the hierarchical structures of micro/meso/macroporous in Eu-MCM.
Fig. 3b, c display that 34%Ag/43%TiO2/Eu-MCM possesses still mesoporous structure with a BET surface area, a porosity, and an average pore width is 116 m2/g, 0.51 cm3/g, 18.4 nm, respectively.
The mesoporous structure of the composite is in favor of mass transferring for photocatalytic reaction.
The structure-directing agent was C16H33N(CH3)3Br (see text)
Yuan: J. of Solid State Chemistry Vol. 181 (2008), p. 1936
Fig. 3b, c display that 34%Ag/43%TiO2/Eu-MCM possesses still mesoporous structure with a BET surface area, a porosity, and an average pore width is 116 m2/g, 0.51 cm3/g, 18.4 nm, respectively.
The mesoporous structure of the composite is in favor of mass transferring for photocatalytic reaction.
The structure-directing agent was C16H33N(CH3)3Br (see text)
Yuan: J. of Solid State Chemistry Vol. 181 (2008), p. 1936
Online since: August 2015
Authors: E. Suprayoga, N. Adam, S.S. Mohm-Tajudin, A.F. Rozlan, D. Puspita, R. Asih, F. Astuti, M.D. Umar, J. Angel, S. Sulaiman, M.I. Mohamed-Ibrahim, Isao Watanabe
Seropegin, CeRu2Al10 with the YbFe2Al10 structure type, l Acta Crystallogr.
Takata, Electronic structure and localized lanthanide character of LnT2Al10 (T = Ru, Os), Phys.
Takata, Crystal Structure and Anisotropic c–f Hybridization in CeT2Al10 (T=Ru, Fe), J.
Kugel, Orbital and magnetic structure of two-dimensional ferromagnets with Jahn-Teller ions, Solid State Commun. 13 (1973) 763
Walton J C, The Positive Muon As a Probe in Free Radical Chemistry, Springer-Verlag, Berlin, 1988
Takata, Electronic structure and localized lanthanide character of LnT2Al10 (T = Ru, Os), Phys.
Takata, Crystal Structure and Anisotropic c–f Hybridization in CeT2Al10 (T=Ru, Fe), J.
Kugel, Orbital and magnetic structure of two-dimensional ferromagnets with Jahn-Teller ions, Solid State Commun. 13 (1973) 763
Walton J C, The Positive Muon As a Probe in Free Radical Chemistry, Springer-Verlag, Berlin, 1988