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Online since: April 2019
Authors: Rinlee Butch M. Cervera, Ariana B. Benipayo
In order to compare and investigate how different methods of synthesis can affect the structure and morphology of LSM-YSZ, SSR and GNP were studied.
Dogan, Development of the anode pore structure and its effects on the performance of solid oxide fuel cells, Int.
Wilkinson, “Solid State Synthetic Methods”, www.chemistry.gatech.edu, 2001 [online].
Available: www.chemistry.gatech.edu/class/6182/wilkinson/solid-state.pdf
Cervera, Structure and conductivity of NiO/YSZ composite prepared via modified glycine-nitrate process at varying sintering temperatures, Ceram.
Dogan, Development of the anode pore structure and its effects on the performance of solid oxide fuel cells, Int.
Wilkinson, “Solid State Synthetic Methods”, www.chemistry.gatech.edu, 2001 [online].
Available: www.chemistry.gatech.edu/class/6182/wilkinson/solid-state.pdf
Cervera, Structure and conductivity of NiO/YSZ composite prepared via modified glycine-nitrate process at varying sintering temperatures, Ceram.
Online since: July 2013
Authors: Bao Feng Li
Nanometer material science is to unite the interdisciplinary physics, colloid chemistry, coordination chemistry, chemical reaction kinetics, surface, interface and other disciplines, is an important part of modern material science, called in twenty-first Century for the material.
Nanometer materials Nano materials by the base crystal structure can be divided into four categories: zero dimensions, one-dimensional, two-dimensional and three-dimensional nanomaterials.
Zero nanometer material mainly is to reveal the structure unit of material in a three-dimensional direction are between 1-100mm, mainly nano material crushing; one-dimensional nano material mainly refers to the structural unit material reached nanometer feature in the two-dimensional direction, mainly nanowire materials, such as carbon nanotubes; two-dimension nano materials mainly refers to the structural unit materials at nanoscale features in one direction, mainly nano film or layered materials; three dimensional nano material is a kind of solid materials nanocrystalline condensed into three-dimensional direction, constitute the bulk material size.
The structure characteristics of nano material and preparation method thereof Structural features At such small scales, the classical theory is no longer applicable, quantum effects has become a factor that can not be ignored.
According to the structure of the prepared product can be divided into low Wiener material preparation method [such as vacuum condensation method, physical crushing method, microemulsion method, the physical vapor deposition (PVD), chemical vapor deposition (CVD), preparation method of hydrothermal synthesis method, sol-gel method, block nano material (such as the crystallization of amorphous alloys) and process for preparing nano composite materials (such as intercalation method).
Nanometer materials Nano materials by the base crystal structure can be divided into four categories: zero dimensions, one-dimensional, two-dimensional and three-dimensional nanomaterials.
Zero nanometer material mainly is to reveal the structure unit of material in a three-dimensional direction are between 1-100mm, mainly nano material crushing; one-dimensional nano material mainly refers to the structural unit material reached nanometer feature in the two-dimensional direction, mainly nanowire materials, such as carbon nanotubes; two-dimension nano materials mainly refers to the structural unit materials at nanoscale features in one direction, mainly nano film or layered materials; three dimensional nano material is a kind of solid materials nanocrystalline condensed into three-dimensional direction, constitute the bulk material size.
The structure characteristics of nano material and preparation method thereof Structural features At such small scales, the classical theory is no longer applicable, quantum effects has become a factor that can not be ignored.
According to the structure of the prepared product can be divided into low Wiener material preparation method [such as vacuum condensation method, physical crushing method, microemulsion method, the physical vapor deposition (PVD), chemical vapor deposition (CVD), preparation method of hydrothermal synthesis method, sol-gel method, block nano material (such as the crystallization of amorphous alloys) and process for preparing nano composite materials (such as intercalation method).
Online since: March 2012
Authors: Gergo Patyi, Zsombor Nagy, Balazs Vajna, Gyorgy Marosi, Peter Anna
Interfaces in Multiphase Polymers and Nanomedicines
Gergo Patyi, Zsombor Nagy, Balazs Vajna, Peter Anna, Gyorgy Marosi
Budapest University of Technology and Economics, Department of Organic Chemistry and Technology H-1111 Budafoki str. 8., Budapest, Hungary
email: gmarosi@mail.bme.hu
Keywords: transcrystallization, amorphization, in-situ nanodrug formation, localized thermal analysis, micro-Raman, chemometry
Abstract.
Figure 1 Classification of modified interfaces The complexity of the structure and kinetics of molecules in the interfaces is increasing towards the nanostructured smart materials.
Transcrystalline interlayer is widely used for nucleating the formation of preferred crystalline structures.
Nanostructured multiphase polymer systems including nanocomposites and nanomedicines contain phase borders that can be several orders of magnitude larger than in microphase-structures, thus almost all the polymer chains, belong to the interphase.
Hull, The Royal Society of Chemistry 4, (2008), pp. 74-91
Figure 1 Classification of modified interfaces The complexity of the structure and kinetics of molecules in the interfaces is increasing towards the nanostructured smart materials.
Transcrystalline interlayer is widely used for nucleating the formation of preferred crystalline structures.
Nanostructured multiphase polymer systems including nanocomposites and nanomedicines contain phase borders that can be several orders of magnitude larger than in microphase-structures, thus almost all the polymer chains, belong to the interphase.
Hull, The Royal Society of Chemistry 4, (2008), pp. 74-91
Online since: April 2016
Authors: Rong Jin, Bi Tao Liu, Liang Sheng Ge, Jia Fu Xu, Liu Yang, Ming Jing Tu
Zhao Qitao etc.[15] introduced that uniform silver nanowires of 20mm synthesized in the template of network pore structure, which butyl titanate was hydrolyzed by acetyl acetone effectively controlling.
And the surface energy of the Ag(111) face is so relatively low that other silver ions tended to deposit on the (111) plane of silver crystal nucleus to grow one dimensional structure of silver nanowires.
It discussed the Ag seed particles were then grown into 1-D structures with a twinned crystal arrangement in the presence of the PVP capping reagent wrapping side face (100) plane in detail.
Geddes: Analytical and Bioanalytical Chemistry, 2005, 382, 926-933
[19] Zhenghua Wang, Jianwei Liu, Xiangying Chen et al: Chemistry, 2005, 11(1):160-163
And the surface energy of the Ag(111) face is so relatively low that other silver ions tended to deposit on the (111) plane of silver crystal nucleus to grow one dimensional structure of silver nanowires.
It discussed the Ag seed particles were then grown into 1-D structures with a twinned crystal arrangement in the presence of the PVP capping reagent wrapping side face (100) plane in detail.
Geddes: Analytical and Bioanalytical Chemistry, 2005, 382, 926-933
[19] Zhenghua Wang, Jianwei Liu, Xiangying Chen et al: Chemistry, 2005, 11(1):160-163
Online since: June 2014
Authors: Huai Ying Zhou, Ying Feng, Chao Hao Hu, Wen Zhao, Yan Zhong, Pan Fei Jiao, Wei Huang
During the last two decades, besides the considerable work on TiO2 modifications, much effort has been made to develop other novel efficient photocatalysts, the fabrication of the heterogeneous structure with other compounds and the modification form the foreign elements [9].
Recently, Bi-based oxychlorides have drawn much attention for their potential application as novel photocatalysts owing to their unique layered structure and high chemical stabilities [16].
This indicated that Ag ions might replace Bi3+ ion and enter into the lattice structure of CaBiO2Cl leading to the lattice distortion to some extent [18].
He, et al.: Journal of Physical Chemistry. 113 (2009), p. 10024-10032
Jeong, et al.: Chemistry of Materials, 17 (2005), p. 6069
Recently, Bi-based oxychlorides have drawn much attention for their potential application as novel photocatalysts owing to their unique layered structure and high chemical stabilities [16].
This indicated that Ag ions might replace Bi3+ ion and enter into the lattice structure of CaBiO2Cl leading to the lattice distortion to some extent [18].
He, et al.: Journal of Physical Chemistry. 113 (2009), p. 10024-10032
Jeong, et al.: Chemistry of Materials, 17 (2005), p. 6069
Online since: January 2013
Authors: Jun Ming Guo, Bin Li, Xiang Zhong Huang, Hong Li Bai, Mi Mi Chen
Synthesis, Characterization and Electrochemical Properties of Li1+xMn2O4 Spinels Prepared by Solution Combustion Synthesis
Bin Li1,2,a, Mimi Chen1,2, Hongli Bai1,2, Xiangzhong Huang1,2, Junming Guo1,2,b
1The Engineering Laboratory of Polylactic Acid-Based Functional Materials of Yunnan, School of Chemistry and Biotechnology, Yunnan University of Nationalities, Kunming 650500, China
2Key Laboratory of Chemistry in Ethnic Medicinal Resources, State Ethnic Affairs Commission & Ministry of Education, Yunnan University of Nationalities, Kunming 650500,China
alibin072@163.com, bguojunming@tsinghua.org.cn (corresponding author)
Keywords: Lithium ion battery, Cathode material, Li1+xMn2O4, Solution combustion synthesis
Abstract: Li1+xMn2O4 prepared by solution combustion synthesis method has a strong exothermic peak at 282.1 ℃, which is believed that the reaction of LiNO3, LiAc2·2H2O with Mn(NO3)2 and MnAc2·4H2O occurs in this region.
It is believed that excess lithium enhances the stability of the structure and ensures that more Li+ ions to intercalate/deintercalate through the cathode and the anode and a trace amount of the excess Li+ ions can be doped into the cubic spinel structure.
The TG curve between 300-1000 ˚C becomes flat, which indicates that no phase transformation occurs, and that further heating could only make the structure of the products more crystalline.
This implies that excess Li in spinel LiMn2O4 would not change its bulk structure.
It is believed that excess lithium enhances the stability of the structure and ensures that more Li+ ions to intercalate/deintercalate through the cathode and the anode and a trace amount of the excess Li+ ions can be doped into the cubic spinel structure.
The TG curve between 300-1000 ˚C becomes flat, which indicates that no phase transformation occurs, and that further heating could only make the structure of the products more crystalline.
This implies that excess Li in spinel LiMn2O4 would not change its bulk structure.
Online since: October 2018
Authors: Maythee Saisriyoot, Penjit Srinoppakhun, Anusith Thanapimmetha, Jackapon Sunthornvarabhas, Kewalee Inna
The small change in intensity of some peaks on PVA composite film, related to the presence of lignin, are also visible at C-C stretching of aromatic structure (at 1450-1600 cm-1) and at C-O of primary alcohol and C-H linkages in the guaiacyl structure (at 1028 cm-1).
And the intensity of some peaks on PVP composite film slightly changed result from the presence of lignin, revealed at 1028 cm-1 as above and C-H linkages in the guaiacyl and syringyl structure (at 1120 cm-1).
Lignin: Functional Biomaterial with Potential in Surface Chemistry and Nanoscience, in The Nanoscience and Technology of Renewable Biomaterials, edited by L.
Chemistry, Ultrastructure, Reactions (Walter de Gruyter, Berlin, 1984)
Henriksson: Lignins: major sources, structure and properties (Elsevier, Netherlands, 2008) [7] K.
And the intensity of some peaks on PVP composite film slightly changed result from the presence of lignin, revealed at 1028 cm-1 as above and C-H linkages in the guaiacyl and syringyl structure (at 1120 cm-1).
Lignin: Functional Biomaterial with Potential in Surface Chemistry and Nanoscience, in The Nanoscience and Technology of Renewable Biomaterials, edited by L.
Chemistry, Ultrastructure, Reactions (Walter de Gruyter, Berlin, 1984)
Henriksson: Lignins: major sources, structure and properties (Elsevier, Netherlands, 2008) [7] K.
Online since: July 2015
Authors: Muhammad Aftab Akram, Sofia Javed, Mohammad Mujahid
While when nanorods are coated with CZTSe nanoparticle (Fig. 1e) then it results in a mesoporous structure which is an ideal structure for semiconductor sensitized solar cells with Core of ZnO window sensitized with CZTSe absorber.
Also combination of these structures such as ZnO/ZnSe window/buffer coated with Absorber (CZTSe or CIGSe) can be effective and efficient options for chalcogenide based thin film solar cells.
Li, "Growth and Structure of Pure ZnO Micro/Nanocombs," Journal of Nanomaterials, vol. 2012, p. 5, 2012
Sberveglieri, "Synthesis of different ZnO nanostructures by modified PVD process and potential use for dye-sensitized solar cells," Materials Chemistry and Physics, vol. 124, pp. 694-698, 11/1/ 2010
Hennig, "ZnO based field-effect transistors (FETs): solution-processable at low temperatures on flexible substrates," Journal of Materials Chemistry, vol. 20, pp. 6622-6625, 2010
Also combination of these structures such as ZnO/ZnSe window/buffer coated with Absorber (CZTSe or CIGSe) can be effective and efficient options for chalcogenide based thin film solar cells.
Li, "Growth and Structure of Pure ZnO Micro/Nanocombs," Journal of Nanomaterials, vol. 2012, p. 5, 2012
Sberveglieri, "Synthesis of different ZnO nanostructures by modified PVD process and potential use for dye-sensitized solar cells," Materials Chemistry and Physics, vol. 124, pp. 694-698, 11/1/ 2010
Hennig, "ZnO based field-effect transistors (FETs): solution-processable at low temperatures on flexible substrates," Journal of Materials Chemistry, vol. 20, pp. 6622-6625, 2010
Online since: July 2015
Authors: Rui Xin Chen, Yue Zhang, Yu Jing Zhu, Yuan Xiang Gu
Solvothermal synthsis of nano-sized Li4Ti5O12 particles as anode material for lithium ion batteries
Yue ZHANG1, a, Yujing ZHU 1,b , Yuanxiang GU 1,c and Ruixin CHEN* 1,d
1College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology,
Qingdao 266042, P.
This material has several advantages including superior cyclic performance due to extremely small structure change during Li ion insertion/extraction, excellent Li-ion mobility and improved safety arising from the high discharge plateau of about 1.5 V [3].
To prepare Li4Ti5O12 fine nanoparticles, it is essential to adopt a soft-chemistry route rather that conventional solid-state synthesis which results in large particle size in submicron to micron range and impurities in the obtained materials.
All the diffraction peaks can be indexed to the orthorhombic olivine structure (space group: Pnma).
Gao, Filter paper templated synthesis of chain-structured Li4Ti5O12/C composite for Li-ion batteries, Mater.
This material has several advantages including superior cyclic performance due to extremely small structure change during Li ion insertion/extraction, excellent Li-ion mobility and improved safety arising from the high discharge plateau of about 1.5 V [3].
To prepare Li4Ti5O12 fine nanoparticles, it is essential to adopt a soft-chemistry route rather that conventional solid-state synthesis which results in large particle size in submicron to micron range and impurities in the obtained materials.
All the diffraction peaks can be indexed to the orthorhombic olivine structure (space group: Pnma).
Gao, Filter paper templated synthesis of chain-structured Li4Ti5O12/C composite for Li-ion batteries, Mater.
Online since: January 2012
Authors: Li Li, Xiao Xia Sun, Ying Chun Li, Yu Hu
The Synthesis of novel material 3,4-ethylenedioxyfuran
Sun Xiaoxia1,a*, Li Yingchun1,b, Li Li1,c, and Hu Yu2,d
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; blyc8751902@163.com; clilyer2002@163.com; dhuyu@ncu.edu.cn
Keywords: 3,4-ethylenedioxyfuran, organic light-emmitting, synthesis, π-conjugated polymers
Abstract.
Specifically, poly(pyrrole), poly(thiophene), and, more recently, poly(selenophene) derivatives have received a great deal of attention owing to diverse optoelectronic properties coupled with the chemical stability, low weight, and the robust mechanical properties of conventional plastics.4 Furthermore, substitutions along the conjugated backbone of these polymers can serve to tune the electronic structure and protect the polymer at positions vulnerable to nucleophilic attack.
Scheme 1 The structures of the materials Developing the new synthetic strategies substituted monomers for the π-conjuated polymers is important and of urgent need.
Results and Discussion Scheme 3 displays the structures of the materials used in this study. diethyl-3,4-dihydroxyfuran-2,5-dicarboxylate III,2,5-dicarboethoxy-3,4-ethylenedioxyfuran IV and 2,5- dicarboxylic acid -3,4-ethylenedioxyfuran V were synthesized according to published procedures.
Scheme 3 The structures of the materials Summary In conclusion, we have developed and optimized an efficient for the synthesis of 3,4-ethylenedioxyfuran from the commercially viable ethylene diglycol.
Specifically, poly(pyrrole), poly(thiophene), and, more recently, poly(selenophene) derivatives have received a great deal of attention owing to diverse optoelectronic properties coupled with the chemical stability, low weight, and the robust mechanical properties of conventional plastics.4 Furthermore, substitutions along the conjugated backbone of these polymers can serve to tune the electronic structure and protect the polymer at positions vulnerable to nucleophilic attack.
Scheme 1 The structures of the materials Developing the new synthetic strategies substituted monomers for the π-conjuated polymers is important and of urgent need.
Results and Discussion Scheme 3 displays the structures of the materials used in this study. diethyl-3,4-dihydroxyfuran-2,5-dicarboxylate III,2,5-dicarboethoxy-3,4-ethylenedioxyfuran IV and 2,5- dicarboxylic acid -3,4-ethylenedioxyfuran V were synthesized according to published procedures.
Scheme 3 The structures of the materials Summary In conclusion, we have developed and optimized an efficient for the synthesis of 3,4-ethylenedioxyfuran from the commercially viable ethylene diglycol.