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Online since: June 2014
Authors: Manoel Ribeiro da Silva, Ana Cristina Figueredo Melo Costa, Lucius Vinicius Rocha Machado, Diogenes M.P. Souza, Nilman D.S. Gomes, Lucilene F. Mouzinho
This paper proposes to investigate the influence of the type of container on the structure, morphology and measures magnetic nanoparticles of the Zn0.6Fe0.4O synthesized by combustion reaction, for use as diluted magnetic semiconductors (DMSs).
From the study of Dietl et al, 2000 other host matrices with features insulating or semiconducting characteristics caught the interest of many researchers in several areas, such: Electrical and Electronics, Materials Science, Electromagnetism, Engineering, Chemistry and Physics.
This indicates that there was partial substitution of Fe3+ ions by Zn2+ ions in the crystal net of the host matrix, which remained with the wurtzite structure.
CONCLUSIONS The technique of combustion reaction showed to be very efficient and promising, to synthesize raw material for diluted magnetic semiconductors for use in spintronics, using different types of containers, since that systems with characteristics ferrimagnetic at the nanoscale were obtained, with the same structure and morphology for both containers.
Journal of Solid State Chemistry, v. 185, p.160-165, 2012
From the study of Dietl et al, 2000 other host matrices with features insulating or semiconducting characteristics caught the interest of many researchers in several areas, such: Electrical and Electronics, Materials Science, Electromagnetism, Engineering, Chemistry and Physics.
This indicates that there was partial substitution of Fe3+ ions by Zn2+ ions in the crystal net of the host matrix, which remained with the wurtzite structure.
CONCLUSIONS The technique of combustion reaction showed to be very efficient and promising, to synthesize raw material for diluted magnetic semiconductors for use in spintronics, using different types of containers, since that systems with characteristics ferrimagnetic at the nanoscale were obtained, with the same structure and morphology for both containers.
Journal of Solid State Chemistry, v. 185, p.160-165, 2012
Online since: July 2013
Authors: Jun Chao Wang, Chun Yun Feng, Yi Biao Li, Shao Hua Jiang, Zhi Mou Wu, Ning Sun
The structure and properties of the composites was studied by Fourier transform infrared spectroscopy(FT-IR), Raman spectroscopy(Raman), Thermal gravimetric analysis(TG) and Differential scanning calorimetry(DSC).
In this paper, HBPU was prepared based on isophorone diisocyanate(IPDI) and diethanolamine(DEOA); then the “Grafting to” method was adopted for grafting HBPU to MWNT surface which possess isocyanate groups, the hyperbranched polyurethane modified Multi-walled Carbon Nanotubes(MWNT-HBPU) was obtained for the first time and its structure and properties were investigated.
Experimental Section Main Materials Multi-walled Carbon Nanotubes(MWNT): Purity>95%, Chengdu Institute of Organic Chemistry Co., Ltd.; Isophorone diisocyanate(IPDI), butyltin dilaurate(DBTDL), industrial grade, Bayer; Thionyl chloride(SOCl2), dibutylamine(DBA), ethylene glycol(HOCH2CH2OH), diethanolamine(DEOA), N, N-dimethyl formamide(DMF) (AR, Guangzhou Reagents Co.
Fig.1 Synthetic route of MWNT-HBPU Results and discussion Structure and properties analysis of MWNT-HBPU The FT-IR analysis The FT-IR spectrum of hyperbranched polyurethane modified multi-walled carbon nanotubes was shown in Figure 2.
[12] Gao Chao, Jin Yizheng, Kong Hao, et al.: Journal of Physical Chemistry B, Vol. 109(24)(2005), p.11925-11932
In this paper, HBPU was prepared based on isophorone diisocyanate(IPDI) and diethanolamine(DEOA); then the “Grafting to” method was adopted for grafting HBPU to MWNT surface which possess isocyanate groups, the hyperbranched polyurethane modified Multi-walled Carbon Nanotubes(MWNT-HBPU) was obtained for the first time and its structure and properties were investigated.
Experimental Section Main Materials Multi-walled Carbon Nanotubes(MWNT): Purity>95%, Chengdu Institute of Organic Chemistry Co., Ltd.; Isophorone diisocyanate(IPDI), butyltin dilaurate(DBTDL), industrial grade, Bayer; Thionyl chloride(SOCl2), dibutylamine(DBA), ethylene glycol(HOCH2CH2OH), diethanolamine(DEOA), N, N-dimethyl formamide(DMF) (AR, Guangzhou Reagents Co.
Fig.1 Synthetic route of MWNT-HBPU Results and discussion Structure and properties analysis of MWNT-HBPU The FT-IR analysis The FT-IR spectrum of hyperbranched polyurethane modified multi-walled carbon nanotubes was shown in Figure 2.
[12] Gao Chao, Jin Yizheng, Kong Hao, et al.: Journal of Physical Chemistry B, Vol. 109(24)(2005), p.11925-11932
Online since: April 2015
Authors: Hilbeth Parente Azikri de Deus, Thales Augusto Barbosa Pinto Silva, Cezar Otaviano Ribeiro Negrão
When this system is under shear load, the continuous element can be decomposed into smaller chain structures called “flocs”.
In this test is considered as initial condition that the material is fully structured.
The material starts to flow and several material linkages of the continuous structure are broken, generating the floc structures.
Hatfield: Colloid and capillary chemistry (Methuen,1926) [25] R.
Drake: International Reviews in Aerosol Physics and Chemistry Vol. 3 (1972), p. 201-376 [26] N.
In this test is considered as initial condition that the material is fully structured.
The material starts to flow and several material linkages of the continuous structure are broken, generating the floc structures.
Hatfield: Colloid and capillary chemistry (Methuen,1926) [25] R.
Drake: International Reviews in Aerosol Physics and Chemistry Vol. 3 (1972), p. 201-376 [26] N.
Online since: April 2020
Authors: Xin Cheng, Qin Fei Li, Wang Yang, Heng Chen, Pengkun Hou
Therefore, the study of the pore structure of hydrated C3S is helpful to understand the C3S hydration products, microstructure and performance.
As the hydration time increases, more foil-like and layer-structure C-S-H gel are generated, increasing N2 adsorption.
According to the International Union of Pure and Applied Chemistry (IUPAC) classification of N2 adsorption isotherms, the shapes of hysteresis loops of the samples with different hydration time are shown in Fig. 4.
The slit pores formed by the accumulation of flake particles are mostly laminated Ca(OH)2 crystals and C-S-H layered structure.
Jawed, Structure and performance of cements, Vol. 13 (2002) p. 978-970
As the hydration time increases, more foil-like and layer-structure C-S-H gel are generated, increasing N2 adsorption.
According to the International Union of Pure and Applied Chemistry (IUPAC) classification of N2 adsorption isotherms, the shapes of hysteresis loops of the samples with different hydration time are shown in Fig. 4.
The slit pores formed by the accumulation of flake particles are mostly laminated Ca(OH)2 crystals and C-S-H layered structure.
Jawed, Structure and performance of cements, Vol. 13 (2002) p. 978-970
Online since: July 2016
Authors: Ladislav Koudelka, Petr Mošner, Kristina Sklepić, Maryna Vorokhta, Andrea Moguš-Milanković
Effect of TeO2 Addition on the Mobility of Silver Ions in
Ag2O–B2O3–P2O5–TeO2 glasses
MOGUŠ-MILANKOVIĆ Andrea1,a *, SKLEPIĆ Kristina1,b,
VOROKHTA Maryna2,c, MOŠNER Petr2,d, and KOUDELKA Ladislav2,e
1Ruđer Bošković Institute, Division of Materials Chemistry, 10000 Zagreb, Croatia
2Department of General and Inorganic Chemistry, University of Pardubice, Faculty of Chemical Technology, 53210 Pardubice, Czech Republic
amogus@irb.hr, bksklepic@irb.hr, cmaryna.vorokhta@student.upce.cz, dPetr.Mosner@upce.cz, eLadislav.Koudelka@upce.cz
Keywords: Borophosphate glass, Silver-ion mobility, Electrical conductivity
Abstract.
The structure was studied by Raman spectroscopy and electrical properties have been studied over a wide temperature and frequency range by impedance spectroscopy.
The most prominent band at 670 cm-1 for glasses containing high TeO2 content corresponds to the Te-eqOax-Te bonds in TeO4 tbp units indicating an increase in the number of TeO4 (tbp) in the glass structure.
For present glasses the scaling behaviour depends on the adjustment of the glass network influenced by the transformation of tellurite structure.
Marinov, Phase Equilibrium, Glass-forming, Properties and Structure of Glasses in the TeO2–B2O3 System, J.
The structure was studied by Raman spectroscopy and electrical properties have been studied over a wide temperature and frequency range by impedance spectroscopy.
The most prominent band at 670 cm-1 for glasses containing high TeO2 content corresponds to the Te-eqOax-Te bonds in TeO4 tbp units indicating an increase in the number of TeO4 (tbp) in the glass structure.
For present glasses the scaling behaviour depends on the adjustment of the glass network influenced by the transformation of tellurite structure.
Marinov, Phase Equilibrium, Glass-forming, Properties and Structure of Glasses in the TeO2–B2O3 System, J.
Online since: September 2013
Authors: A. Setiadi, Supri Jadi
Atomic structure in armchair edge (5,5) CNT.
Fig. 1 show the structure of armchair (5,5) of CNT in different condition, as original structure, Fig.1(a) shows the pristine structure of armchair (5,5) CNT.
Ma et al stated that the most stable structure graphene containing SW defect is not planar structure, but sin-like structure [9].
Jónsson, in: Theoretical Methods in Condensed Phase Chemistry, edited by S.D.
Schwartz, volume 5 of Progress in Theoretical Chemistry and Physics, chapter, 10, Kluwer Academic Publishers (2000)
Fig. 1 show the structure of armchair (5,5) of CNT in different condition, as original structure, Fig.1(a) shows the pristine structure of armchair (5,5) CNT.
Ma et al stated that the most stable structure graphene containing SW defect is not planar structure, but sin-like structure [9].
Jónsson, in: Theoretical Methods in Condensed Phase Chemistry, edited by S.D.
Schwartz, volume 5 of Progress in Theoretical Chemistry and Physics, chapter, 10, Kluwer Academic Publishers (2000)
Online since: December 2022
Authors: Llewellyn Ann N. Aspa, Chelsea Mae L. Escutin
To obtain such a low RI, introducing pores or fabricating multi-layer structures can be done.
This method is widely used in this type of application due to its formation of porous structure and network cross-linking.
This provides a low refractive index and nearly 100% transmittance due to its inter-particle and porous structure [3].
The structure of films such thickness and porosity also affect the properties of the films.
Ye, et al: One-step sol–gel preparation of PDMS–silica ORMOSILs as environment-resistant and crack-free thick antireflective coatings (Journal of Materials Chemistry, 2012)
This method is widely used in this type of application due to its formation of porous structure and network cross-linking.
This provides a low refractive index and nearly 100% transmittance due to its inter-particle and porous structure [3].
The structure of films such thickness and porosity also affect the properties of the films.
Ye, et al: One-step sol–gel preparation of PDMS–silica ORMOSILs as environment-resistant and crack-free thick antireflective coatings (Journal of Materials Chemistry, 2012)
Online since: October 2024
Authors: Gemilang Idea Mida Khoirunisa, Michael Natan Syalom, Pramudita Sidik Hasibuan, Reykhan Lucy Bagaskara, Faiza Afrin Oktalitha Khunaifi, Silviana Silviana
The amino groups in chitosan's structure make it polycationic in acidic environments [27], [28].
These tetrahedral structures combine to form a substantial silica matrix [57].
Yoo, “Advanced silica/polymer composites: Materials and applications,” Journal of Industrial and Engineering Chemistry, vol. 38, pp. 1–12, 2016, doi: 10.1016/j.jiec.2016.04.016
Maharani, “Determination Swelling of Urea Fertilizer (Slow Release Fertilizer) in the Matrix of Chitosan-Humic Acid,” Unesa Journal of Chemistry, vol. 7, no. 1, pp. 30–33, 2018
Liu, “Synthesis of mesoporous silica with cationic-anionic surfactants,” Glass Physics and Chemistry, vol. 36, no. 2, pp. 182–189, 2010, doi: 10.1134/S1087659610020069
These tetrahedral structures combine to form a substantial silica matrix [57].
Yoo, “Advanced silica/polymer composites: Materials and applications,” Journal of Industrial and Engineering Chemistry, vol. 38, pp. 1–12, 2016, doi: 10.1016/j.jiec.2016.04.016
Maharani, “Determination Swelling of Urea Fertilizer (Slow Release Fertilizer) in the Matrix of Chitosan-Humic Acid,” Unesa Journal of Chemistry, vol. 7, no. 1, pp. 30–33, 2018
Liu, “Synthesis of mesoporous silica with cationic-anionic surfactants,” Glass Physics and Chemistry, vol. 36, no. 2, pp. 182–189, 2010, doi: 10.1134/S1087659610020069
Online since: May 2013
Authors: Lan Li Chen, Zhi Hua Xiong, Hong Duo Hu
Moreover, in the pure-ZnO structure, c/a=1.633.
Band structure and DOS of the pure-ZnO.
Band structure of the doping systems (a) Gd: ZnO; (b) Nd: ZnO; (c) Pr: ZnO.
The shapes of band structure of varies doping system are almost the same as each other.
References [1] Frank Maldonado, Arvids Stashans, Journal of Physics and Chemistry of Solids, 71 (2010) 784-787
Band structure and DOS of the pure-ZnO.
Band structure of the doping systems (a) Gd: ZnO; (b) Nd: ZnO; (c) Pr: ZnO.
The shapes of band structure of varies doping system are almost the same as each other.
References [1] Frank Maldonado, Arvids Stashans, Journal of Physics and Chemistry of Solids, 71 (2010) 784-787
Online since: May 2012
Authors: Ming Lan Ge, Jie Ming Xiong, Chen Chen
They have gained attractiveness as green solvents or designer solvents, as alternatives for volatile organic compounds and found applications in many fields such as synthesis, catalysis, biocatalysis, separation technology, electrochemistry, analytical chemistry and nanotechnology [5].
The development of a quantitative structure-property relationship (QSPR) can aid in the understanding of and can provide a method of estimating the values of directly from structure without making an experimental measurement.
In a QSPR study, a mathematical model is developed which relates the structures of a set of compounds to a physical property such as .
The underlying assumption in a QSPR is that there is some sort of relationship between the physical property of interest and molecular structure.
The result showed that the QSPR model had a good correlation between organic molecular structure and in [EMIM][BF4].
The development of a quantitative structure-property relationship (QSPR) can aid in the understanding of and can provide a method of estimating the values of directly from structure without making an experimental measurement.
In a QSPR study, a mathematical model is developed which relates the structures of a set of compounds to a physical property such as .
The underlying assumption in a QSPR is that there is some sort of relationship between the physical property of interest and molecular structure.
The result showed that the QSPR model had a good correlation between organic molecular structure and in [EMIM][BF4].