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Online since: November 2010
Authors: Guo Sheng Gai, Yu Fen Yang, Zhi Xian Jin, Cheng Bao Wu
This is the phenomenon of mechano-chemistry.
The structure is simple and maintenance is less problematic.
The control of particle structures has raised significant challenges on synthesis process; much effort has been taken to explore new processes for novel structures on the one hand, and to understand the formation mechanism on the other.
The R&D activities were mainly focused on two aspects in this sector of particle formation, that is, to explore novel processes for structure control and novel structure formation, and to study the structure-function relation to explore distinct features that coarse powder material do not has.
These features are important because the structure of nanotube determines the properties and technological potentials of these materials.
The structure is simple and maintenance is less problematic.
The control of particle structures has raised significant challenges on synthesis process; much effort has been taken to explore new processes for novel structures on the one hand, and to understand the formation mechanism on the other.
The R&D activities were mainly focused on two aspects in this sector of particle formation, that is, to explore novel processes for structure control and novel structure formation, and to study the structure-function relation to explore distinct features that coarse powder material do not has.
These features are important because the structure of nanotube determines the properties and technological potentials of these materials.
Online since: July 2022
Authors: Nicolas Bigot, M'hamed Boutaous, Nahiene Hamila, Shi He Xin
According to the processing conditions and the choice of
the fiber/matrix couple, transcrystalline structures can grow up.
From a nucleus, a crystalline structure grows at a rate dependent on the local temperature.
In fact, Fig.4 represents the mean size of the crystalline structures.
By the beginning of the spherulites growth, the media is already crowded by the transcrystalline structures.
Hoffman, "Theory of formation of polymer crystals with folded chains in dilute solution," Journal of Research of the National Bureau of Standards Section A: Physics and Chemistry, vol. 64A, p. 73, Jan. 1960.
From a nucleus, a crystalline structure grows at a rate dependent on the local temperature.
In fact, Fig.4 represents the mean size of the crystalline structures.
By the beginning of the spherulites growth, the media is already crowded by the transcrystalline structures.
Hoffman, "Theory of formation of polymer crystals with folded chains in dilute solution," Journal of Research of the National Bureau of Standards Section A: Physics and Chemistry, vol. 64A, p. 73, Jan. 1960.
Online since: July 2016
Authors: Gui Wu Liu, Kai Zhang, Zi Wei Xu, Feng Ding, Guan Jun Qiao
Introduction
The role as the 1-D nanoreaction chambers provided by the hollow spaces of the CNTs, including both the single-walled carbon nanotubes (SWNTs) and multi-walled carbon nanotubes (MWNTs), facilitate the studies on the physics and chemistry on the 1-D arranged atoms or molecules [1].
Is it possible for the inner tube to form the similar structure with bend junction or form amorphous structure?
For simplicity, we use “(18,0)Ʌ(9,9)” to represent the structure of the host tube with carbon bonds stretched by 10%.
Thus, the full picture of the structure transformation can be observed easily by the EDKMC method.
Barrera, Effect of interwall interaction on the electronic structure of double-walled carbon nanotubes, Nanotechnology 26 (2015) 165201
Is it possible for the inner tube to form the similar structure with bend junction or form amorphous structure?
For simplicity, we use “(18,0)Ʌ(9,9)” to represent the structure of the host tube with carbon bonds stretched by 10%.
Thus, the full picture of the structure transformation can be observed easily by the EDKMC method.
Barrera, Effect of interwall interaction on the electronic structure of double-walled carbon nanotubes, Nanotechnology 26 (2015) 165201
Online since: June 2018
Authors: Xin Li Hao, Jing Zhe Zhao, Yue Hong Song, Zhi Fang Huang
China
4College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P.R.
RhB is a common dye, which has a stable chemical structure.
Results and Discussion Structure and Morphology Fig. 1.
From crystal structure graphs (inset in Figure 1a), it can be seen that Bir-MnO2 has layered structures.
The nanoflower structure was composed of many flakes radiating from its center.
RhB is a common dye, which has a stable chemical structure.
Results and Discussion Structure and Morphology Fig. 1.
From crystal structure graphs (inset in Figure 1a), it can be seen that Bir-MnO2 has layered structures.
The nanoflower structure was composed of many flakes radiating from its center.
Online since: May 2006
Authors: José A. Covas, Imre Kiricsi, Carlos A. Bernardo, Zsolt E. Horváth, Olga S. Carneiro, João M. Maia, Carla Leer, Ferrie W.J. van Hattum, László Péter Biró
This is a
rather challenging task, as these nano-structures come as entangled aggregates, and individual
CNTs are bound by high London - van der Waals cohesive forces.
Please note the darker grey level of Fig 2c, evidencing the break-up of larger agglomerates into well dispersed structures.
Electrical properties The high aspect ratio of carbon nanotubes allows the formation of a percolated structure at low loadings.
Therefore, one can assume that in the present case we are still dealing with agglomerated structures that form an interconnected structure, responsible for electrical conduction.
The conductivity dependence on the MWNT dispersion state here is linear only up to certain point, at which contact probability between the aggregated structures and/or individual carbon nanotubes becomes lower, as dispersion and orientation of the conductive structures increases.
Please note the darker grey level of Fig 2c, evidencing the break-up of larger agglomerates into well dispersed structures.
Electrical properties The high aspect ratio of carbon nanotubes allows the formation of a percolated structure at low loadings.
Therefore, one can assume that in the present case we are still dealing with agglomerated structures that form an interconnected structure, responsible for electrical conduction.
The conductivity dependence on the MWNT dispersion state here is linear only up to certain point, at which contact probability between the aggregated structures and/or individual carbon nanotubes becomes lower, as dispersion and orientation of the conductive structures increases.
Online since: August 2019
Authors: Riesma Tasomara, Djarwani Soeharso Soejoko, Siti Julia, Yessie Widya Sari, Nurlely Nurlely
X-ray powder diffraction (XRD) pattern shows the transformation of dicalcium phosphate dyhydrate to apatite crystal structure.
The substitution of carbonate ion is expected to be present on calcium phosphate crystal structure.
Morphological structure of carbonated calcium phosphate-collagen prepared in different microwave irradiation time is shown in Fig. 4.
Glimcher, The Chemistry and Biology of Mineralized Connective Tissues (ed.
The substitution of carbonate ion is expected to be present on calcium phosphate crystal structure.
Morphological structure of carbonated calcium phosphate-collagen prepared in different microwave irradiation time is shown in Fig. 4.
Glimcher, The Chemistry and Biology of Mineralized Connective Tissues (ed.
Online since: March 2014
Authors: M.K. Tabatabaei, J. Koohsorkhi, Hasan Ghafoorifard
In the modified configuration, the anode and cathode structures are the main features.
As can be seen from these images, the growth is not perfect, more impurity was observed, and there are still curvatures in the CNT structures.
The G band is related to the ordered carbonaceous structures.
It can be said that eliminating AC plasma causes a decreased effect to CNT structure.
Elussen,Plasma Chemistry Electrical Break Down and Discharge in Gases Part B: Macroscopic Processes and Discharge, E.Kunhard and L.H.
As can be seen from these images, the growth is not perfect, more impurity was observed, and there are still curvatures in the CNT structures.
The G band is related to the ordered carbonaceous structures.
It can be said that eliminating AC plasma causes a decreased effect to CNT structure.
Elussen,Plasma Chemistry Electrical Break Down and Discharge in Gases Part B: Macroscopic Processes and Discharge, E.Kunhard and L.H.
Online since: February 2014
Authors: Michele di Sivo, Daniela Ladiana
Such projectual criteria have been recently employed in sectors such as aeronautics, chemistry and nuclear, where the collapse of a component, apparently of little influence, could cause catastrophic events.
Analysis have also to verify the effects of differential shifts of each element fixing points, due to elastic deformations and settlement of structures at the back.
Permanent loads which mostly involve façades are: own weight of the slab and own weight of the fixing structures.
The wind action is the main factor causing elastic deformations on building structures.
Indirect actions represent the behavior conditions of operating support structures and coating material in a given context.
Analysis have also to verify the effects of differential shifts of each element fixing points, due to elastic deformations and settlement of structures at the back.
Permanent loads which mostly involve façades are: own weight of the slab and own weight of the fixing structures.
The wind action is the main factor causing elastic deformations on building structures.
Indirect actions represent the behavior conditions of operating support structures and coating material in a given context.
Online since: January 2020
Authors: D.M. Galimov, Aleksandr A. Dyakonov, Dmitry V. Ardashev
In these images, the coating has a light appearance, the structure of the base metal is visible to the right of the layer.
For solid chromium coatings, a layered structure and microspheroids on the surface of the layer are characteristic.
When studying the surface of the chrome coating, similar structures were indeed observed, but the coating layers were not detected.
Under the coating layer, there is a metal base structure having a lamellar structure (probably packet martensite).
Fedotiev, Applied Electrochemistry, Chemistry, Moscow, 1962
For solid chromium coatings, a layered structure and microspheroids on the surface of the layer are characteristic.
When studying the surface of the chrome coating, similar structures were indeed observed, but the coating layers were not detected.
Under the coating layer, there is a metal base structure having a lamellar structure (probably packet martensite).
Fedotiev, Applied Electrochemistry, Chemistry, Moscow, 1962
Online since: July 2015
Authors: Abdul Razak Rahmat, Agus Arsad, Nur Shazrynda Md Shahrodin
Figure 3 a) shows a dense, opaque and apple like structure (aggregates), as the concentration increased, the images (Figure 3b - d) became less dense and it spread or created more “open” structure.
The acid forcefully attacked amorphous region and the action caused phase changes (amorphous to crystalline), where by more crystalline structure was formed.
The B – type peaks become sharper due to the increasing of crystal structure formed by gradually addition of acid concentration.
Structure Characterization of C-type Starch Granule by Acid Hydrolysis.
Journal of Agricultural and Food Chemistry, 58(12), 7383-7388.
The acid forcefully attacked amorphous region and the action caused phase changes (amorphous to crystalline), where by more crystalline structure was formed.
The B – type peaks become sharper due to the increasing of crystal structure formed by gradually addition of acid concentration.
Structure Characterization of C-type Starch Granule by Acid Hydrolysis.
Journal of Agricultural and Food Chemistry, 58(12), 7383-7388.