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Online since: November 2007
Authors: Soo Jin Chua, Hong Quang Le
In order to extract electrical parameters from the
ZnO nanorod, let's consider the metal (Au)-Semiconductor
(ZnO) -metal (Au) structure (figure 3).
For general nanostructure (nanorod, nanowires) based MSM structure, the conventional thermionic emission theory fail in analyzing the electrical transport behavior due to small signal of these nano-electronic devices which is comparable to the tunneling current from metal to semiconducting nanorod (few tens of nA).
As a result, the nanorod based metal-semiconductor-metal structure is usually modeled using the thermionic field emission model of Padovani and Stratton [1].
The observed slow decrease rate of the UV response was not only controlled by the oxygen concentration in the ambient but also affected by the recovery of the modified surface chemistry [5].
By treating the transport in the nanorod as in a metal-semiconductor-metal structure and basing on thermionic field emission model of Padovani and Stratton, the resistance, carrier concentration and mobility of ZnO nanorod was extracted.
For general nanostructure (nanorod, nanowires) based MSM structure, the conventional thermionic emission theory fail in analyzing the electrical transport behavior due to small signal of these nano-electronic devices which is comparable to the tunneling current from metal to semiconducting nanorod (few tens of nA).
As a result, the nanorod based metal-semiconductor-metal structure is usually modeled using the thermionic field emission model of Padovani and Stratton [1].
The observed slow decrease rate of the UV response was not only controlled by the oxygen concentration in the ambient but also affected by the recovery of the modified surface chemistry [5].
By treating the transport in the nanorod as in a metal-semiconductor-metal structure and basing on thermionic field emission model of Padovani and Stratton, the resistance, carrier concentration and mobility of ZnO nanorod was extracted.
Online since: March 2014
Authors: Janis Zicans, Remo Merijs Meri, Valdis Kalkis, Ingars Reinholds, Ivans Bockovs
New Thermoshrinkable Materials of Radiation Modified Polypropylene-Elastomer Composites with Cross-linking Agents
Ingars Reinholds1, a, Valdis Kalkis1,b , Janis Zicans2,c , Remo Merijs-Meri2,d and Ivans Bockovs2,e
1Department of Chemistry, University of Latvia, Riga, Latvia
2Institute of Polymer Materials, Riga Technical University, Riga, Latvia
aingars.reinholds@lu.lv, bvkalkis@lu.lv, czicans@ktf.rtu.lv, dremo.merijs-meri@rtu.lv, duruchay@inbox.lv (Valdis Kalkis)
Keywords: Polypropylene, elastomers, ionizing radiation, cross-linking promoters, thermo-shrinkable materials
Abstract.
Upon treating the polymer by ionizing radiation, a reticulate molecular structure is formed, whose degree of cross-linking depends on the absorbed radiation and the structure of polymer.
These changes of elastic modulus indicate to an important role of cross-linking agent structure on the phase morphology of PP/CPE blends.
It can be judged that BPDMA has a better compatibility with the linear macromolecules of CPE, while the structure of branched TMPTA affects decrease of elastic modulus.
Suleiman, Study of the effect of EPDM structure on the compatibility of PP/LDPE blends, Arab.
Upon treating the polymer by ionizing radiation, a reticulate molecular structure is formed, whose degree of cross-linking depends on the absorbed radiation and the structure of polymer.
These changes of elastic modulus indicate to an important role of cross-linking agent structure on the phase morphology of PP/CPE blends.
It can be judged that BPDMA has a better compatibility with the linear macromolecules of CPE, while the structure of branched TMPTA affects decrease of elastic modulus.
Suleiman, Study of the effect of EPDM structure on the compatibility of PP/LDPE blends, Arab.
Online since: June 2014
Authors: Shahram Ghanbari Pakdehi, Maryam Rasoolzadeh, Mozaffar Salimi
Introduction
Monolithic catalysts are one of the most attractive structures that have sensible application in catalytic reaction engineering and industrial catalysis [1-3].
The most common material for monolithic structures is cordierite (a ceramic material consisting of magnesia, silica, and alumina (2MgO.2Al2O3.5SiO2)).
Moulijn, "Structured catalysts and reactors", USA: Marcel Dekker, Inc., 1998
Forzatti, The deposition of gamma-Al2O3 layers on ceramic and metallic supports for the preparation of structured catalysts, Catal.
Forzatti, The deposition of γ-Al2O3 layers on ceramic and metallic supports for the preparation of structured catalysts, Catal.
The most common material for monolithic structures is cordierite (a ceramic material consisting of magnesia, silica, and alumina (2MgO.2Al2O3.5SiO2)).
Moulijn, "Structured catalysts and reactors", USA: Marcel Dekker, Inc., 1998
Forzatti, The deposition of gamma-Al2O3 layers on ceramic and metallic supports for the preparation of structured catalysts, Catal.
Forzatti, The deposition of γ-Al2O3 layers on ceramic and metallic supports for the preparation of structured catalysts, Catal.
Online since: December 2014
Authors: Tatiane M. Arantes, Mauricio R. Baldan, Nazir M. Santos, Neidênei G. Ferreira
Nitrogen causes distortions in the diamond structure due to the mechanical stress and the increase in the number of defects (vacancies).
Although, for bigger concentrations, nitrogen may become incorporated in cluster form that may also produce changes in the bonding and morphological structure of the films [9].
These analyses indicated the presence of crystalline diamond structure in the samples produced even at higher contents of nitrogen added during the gas phase.
According to the results obtained using Raman, we can observe that the G-band shift to higher values is due to the increase in the amount of sp2 hybridizations in the molecular structure.
Swain: Analytical Chemistry Vol. 74 (2002), p. 5924
Although, for bigger concentrations, nitrogen may become incorporated in cluster form that may also produce changes in the bonding and morphological structure of the films [9].
These analyses indicated the presence of crystalline diamond structure in the samples produced even at higher contents of nitrogen added during the gas phase.
According to the results obtained using Raman, we can observe that the G-band shift to higher values is due to the increase in the amount of sp2 hybridizations in the molecular structure.
Swain: Analytical Chemistry Vol. 74 (2002), p. 5924
Online since: March 2012
Authors: De Hong Zhuang, Xing She, Hai Bo Wang
One is the perceptible material which could be used to create transducer has the perception of intensity of outside stimulation (such as stress, strain, hot, light, magnetism, chemistry and radiation).
Moreover, intelligent material will support development of future technology, eliminate the gap of the functional materials and structure materials under traditional sense gradually, and achieve structure functionalization and function diversification. 1.2 The purpose and significance of development intelligent materials Throughout our history, whenever a new material has been widely applied, would cause a great change in product development field.
In the field of medical, intelligent material and structure could be used to create tactile artificial limb which without electrical or mechanical control.
Specific steps are: (1) Collect information of intelligence material; classify intelligence material by field of structure, function, application and so on.
Conclusion “Material is a physical carrier of the form of the structure and function” [5].
Moreover, intelligent material will support development of future technology, eliminate the gap of the functional materials and structure materials under traditional sense gradually, and achieve structure functionalization and function diversification. 1.2 The purpose and significance of development intelligent materials Throughout our history, whenever a new material has been widely applied, would cause a great change in product development field.
In the field of medical, intelligent material and structure could be used to create tactile artificial limb which without electrical or mechanical control.
Specific steps are: (1) Collect information of intelligence material; classify intelligence material by field of structure, function, application and so on.
Conclusion “Material is a physical carrier of the form of the structure and function” [5].
Online since: February 2011
Authors: Xue Zeng Zhao, Fei Wang, Xiao Ming Wang, Da Lei Jing
It is well know most of the micro/nano devices are typically plate-structured.
Thundat: Analytical Chemistry Vol.76 (2004), p. 292–297
[7] Zang X and Sharam P: International Journal of Solids and Structures Vol.42 (2005), p.3833–3851
Lam et al.: International Journal of Solids and Structures Vol.39 (2002), p. 2731–2743
Tsiatas: International Journal of Solids and Structures Vol.46 (2009), p. 2757–2764
Thundat: Analytical Chemistry Vol.76 (2004), p. 292–297
[7] Zang X and Sharam P: International Journal of Solids and Structures Vol.42 (2005), p.3833–3851
Lam et al.: International Journal of Solids and Structures Vol.39 (2002), p. 2731–2743
Tsiatas: International Journal of Solids and Structures Vol.46 (2009), p. 2757–2764
Online since: December 2013
Authors: Zhi Chen, Yi Long Xie, Jin Xing Qiu, Zhong He Chen
By introducing tetraphenylethene, anthrylvinylene or triphenylacrylonitrile into the molecule structure, TPA derivatives can be highly emissive in solid state and exhibit an AIE behavior [5,6].
Subtle changes in molecule structure can exert great influences on the molecule stacking and, furthermore, the optoelectronic properties.
The usual methods of subtle structure modification include variation of periphery substitution, conjugation length and substitution position [7,8].
The data were in good agreement with the proposed structures.
Substitution position directing the molecular packing, electronic structure, and aggregate emission property of bis[2-(9-anthracenyl)vinyl]benzene system.
Subtle changes in molecule structure can exert great influences on the molecule stacking and, furthermore, the optoelectronic properties.
The usual methods of subtle structure modification include variation of periphery substitution, conjugation length and substitution position [7,8].
The data were in good agreement with the proposed structures.
Substitution position directing the molecular packing, electronic structure, and aggregate emission property of bis[2-(9-anthracenyl)vinyl]benzene system.
Online since: September 2016
Authors: Alexander P. Ilyin, Andrey V. Korshunov, Valentina V. Smirnova, Sergey V. Zmanovskiy
Disperse composition, morphology and structure of powder particles was determined using dynamic light scattering in ethylene glycol medium (Microsizer-201, Nanosizer ZS with He-Ne laser, l=632.8 nm), scanning (Quanta 200 3D) and transmission high-resolution electron microscopy (JEOL JEM-3010).
Phase composition and structure parameters were determined according to x-ray phase analysis (DEFRA 4401, FeKa-radiation).
This lead to changes in the composition and structure of the oxide film and caused the loss of its protective function. 2.
The stability of submicron particles Al to the effects of water vapor can be explained by formation of the electric double layer which stabilizes the oxide shell structure and slows diffusion of an oxidant to the particles metal core.
Kroger, The Chemistry of imperfect Crystals, Int.
Phase composition and structure parameters were determined according to x-ray phase analysis (DEFRA 4401, FeKa-radiation).
This lead to changes in the composition and structure of the oxide film and caused the loss of its protective function. 2.
The stability of submicron particles Al to the effects of water vapor can be explained by formation of the electric double layer which stabilizes the oxide shell structure and slows diffusion of an oxidant to the particles metal core.
Kroger, The Chemistry of imperfect Crystals, Int.
Online since: August 2018
Authors: Chanchana Thanachayanont, Seeroong Prichanont, Helene Debeda, Onuma Santawitee, Bralee Chayasombat, Maria Isabel Rua-Taborda, Catherine Elissalde, Jérome Bernard, Angkana Phongphut
However, compared to those of piezoceramics, the higher brittleness and the lower piezoelectric properties of PZT freestanding structures are mostly related to the high porosity of the piezoelectric layer.
Our piezoelectric microsystem consists in a three-dimensional thick-film structure made of a thick PZT layer sandwiched between two gold electrodes.
The most interesting feature of these materials is their regular pore structure with suitable pore dimension to absorb VOCs molecules.
Ingman, “Chemical sensors definitions and classification”, Pure and Applied Chemistry, 63(9) 1247-1250 (1991)
Brühwiler, “The structure of mesoporous silica obtained by pseudomorphic transformation of SBA-15 and SBA-16” , Microporous and mesoporous materials 257, 232-240 (2018)
Our piezoelectric microsystem consists in a three-dimensional thick-film structure made of a thick PZT layer sandwiched between two gold electrodes.
The most interesting feature of these materials is their regular pore structure with suitable pore dimension to absorb VOCs molecules.
Ingman, “Chemical sensors definitions and classification”, Pure and Applied Chemistry, 63(9) 1247-1250 (1991)
Brühwiler, “The structure of mesoporous silica obtained by pseudomorphic transformation of SBA-15 and SBA-16” , Microporous and mesoporous materials 257, 232-240 (2018)
Online since: August 2016
Authors: Jian Qiang Ye, Hai Feng Chen, Peng Cheng Ruan, Jing Ling Hu
Preparation and Activities of Visible-Light-Driven BiVO4 by Doping Ag via Solid State Method
Ruan Pengcheng, Chen Haifenga*, Hu Jingling and Ye Jianqiang
Department of Materials & Chemistry, Huzhou University, P.
Not only the preparation but also the structure of BiVO4 plays an important role in the property.
Influence of Ag content on crystal structure.
The as-obtained samples have good crystallinity and integrated structure.
Being grinded for 20 min and dried at 120°C for 8 h, the samples basically showed the monocline structure.
Not only the preparation but also the structure of BiVO4 plays an important role in the property.
Influence of Ag content on crystal structure.
The as-obtained samples have good crystallinity and integrated structure.
Being grinded for 20 min and dried at 120°C for 8 h, the samples basically showed the monocline structure.