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Online since: October 2015
Authors: Anchan Muakngam, Naris Barnthip
It is shown that the film surface is quite smooth with no cauliflower-like structure at operating power of 50 W and 75 W.
Surface roughness increases with flake-like structure when the operating power is enlarged to 100 W and 125 W.
Flake-like structure appears instead of grains when the coating time is 150 sec and 180 sec.
Procoagulant surface chemistry and energy, J.
Surface roughness increases with flake-like structure when the operating power is enlarged to 100 W and 125 W.
Flake-like structure appears instead of grains when the coating time is 150 sec and 180 sec.
Procoagulant surface chemistry and energy, J.
Online since: October 2014
Authors: Catalin Pirvu, Lorena Deleanu, Simona Badea
Fully clamped cylindrical plates are made of aluminum alloy, D16AT, used in aircraft structures.
The results obtained can be useful in the analysis of the airframe structures with battle damage caused during war operations.
Yang, Impact mechanics of elastic and elastic-plastic sandwich structures, PhD dissertation, The Univ. of Akron, Akron, Ohio (2006)
Lide, ed., CRC Handbook of Chemistry and Physics (84th ed.)
The results obtained can be useful in the analysis of the airframe structures with battle damage caused during war operations.
Yang, Impact mechanics of elastic and elastic-plastic sandwich structures, PhD dissertation, The Univ. of Akron, Akron, Ohio (2006)
Lide, ed., CRC Handbook of Chemistry and Physics (84th ed.)
Online since: September 2017
Authors: R.A. Soler-Crespo, A. Pedivellano, Wei Gao, H.D. Espinosa, Ivano Benedetti
Recent studies, based on high-resolution transmission electron microscopy, have highlighted that GO generally presents a highly inhomogeneous structure in which graphitic areas and high contrast, disordered oxidized regions are simultaneously present and co-exist with holes, e.g. see Fig.(1).
On the basis of such considerations, a simple random sequential adsorption algorithm is used in the present study to generate random artificial nano-structures to be employed in the continuum computational analysis of GO, to investigate the existence of representative volume elements.
The Journal of Physical Chemistry Letters, 7(14), 2702-2707, 2016
Determination of the local chemical structure of graphene oxide and reduced graphene oxide.
On the basis of such considerations, a simple random sequential adsorption algorithm is used in the present study to generate random artificial nano-structures to be employed in the continuum computational analysis of GO, to investigate the existence of representative volume elements.
The Journal of Physical Chemistry Letters, 7(14), 2702-2707, 2016
Determination of the local chemical structure of graphene oxide and reduced graphene oxide.
Online since: May 2004
Authors: Maria Georgescu, M. Coarna, A. Puri, D. Diaconu
., no. 6, Sector 6, Postal Code
77562, Bucharest, Romania
2, 3
University POLITEHNICA, Faculty of Industrial Chemistry, Department Science and
Engineering of Oxide Materials, P.O.
There are two different view points about their increasing strength mechanism: (1) the polymer can improve the pore structure and as a consequence the strength can be increased according to Griffith's theory [1] and, (2) the polymer can react with the cement and these reactions play an important role in the strength development [2].
Pores higher than 10 µm were not found in the structure of the composite specimens.
In such high flexural strength specimens, MIP results reveal a close packed arrangement of cement particles with a pore structure which is free of pores higher than 10 µm.
There are two different view points about their increasing strength mechanism: (1) the polymer can improve the pore structure and as a consequence the strength can be increased according to Griffith's theory [1] and, (2) the polymer can react with the cement and these reactions play an important role in the strength development [2].
Pores higher than 10 µm were not found in the structure of the composite specimens.
In such high flexural strength specimens, MIP results reveal a close packed arrangement of cement particles with a pore structure which is free of pores higher than 10 µm.
Online since: February 2011
Authors: Rui Liu, Wein Duo Yang, Hui Ju Chueng
Preparation and Visible-light Photocatalytic Activity of TiO2 Nanotubes from a Hydrothermal Method
Rui Liu1, a, Wein-Duo Yang2, b and Hui-Ju Chueng2, c
1 Department of Applied Chemistry Harbin Institute of Technology, Harbin 150001, P R China
2Department of Chemical and Materials Engineering National Kaohsiung University of Applied Sciences, Kaohsiung 807, Taiwan
aliurui19840601@yahoo.cn, bywd@cc.kuas.edu.tw, cjeol0921@yahoo.com.tw
Keywords: TiO2 Nanotubes, Hydrothermal, Photocatalytic Degradation.
The characteristics of calcined TiO2 nanotubes were also analyzed: the crystalline phase was identified by an X-ray diffractometer (XRD), the surface area was determined by a BET analyzer (Micromeritics, ASAP 2101), and the surface structure and nanotube morphology were examined by a scanning electron microscope (SEM) (Philips, XL-40).
The structure of the nanotubes prepared at 130oC and calcined at 450oC was also verified by their Raman spectrum, as shown in Figure 2.
However, the tubular structure was retained and the nanotubes were deposited on each other [6, 7].
The characteristics of calcined TiO2 nanotubes were also analyzed: the crystalline phase was identified by an X-ray diffractometer (XRD), the surface area was determined by a BET analyzer (Micromeritics, ASAP 2101), and the surface structure and nanotube morphology were examined by a scanning electron microscope (SEM) (Philips, XL-40).
The structure of the nanotubes prepared at 130oC and calcined at 450oC was also verified by their Raman spectrum, as shown in Figure 2.
However, the tubular structure was retained and the nanotubes were deposited on each other [6, 7].
Online since: July 2019
Authors: Takeshi Ohshima, Nguyen Tien Son, Andreas Gällström, Björn Magnusson, Ádám Gali, Ivan Ivanov, András Csо́rе́
.,
H-1111 Budapest, Hungary
2Link¨oping University, Department of Physics, Chemistry and Biology, SE-58183 Link¨oping, Sweden
3Norstel AB, Ramsh¨allsv¨agen 15, SE-60238 Norrk¨oping, Sweden
4Saab Dynamics AB, SE-58188 Link¨oping, Sweden
5National Institutes for Quantum and Radiological Science Technology, 1233 Watanuki, Takasaki,
Gunma 370-1292, Japan
6Wigner Research Centre for Physics, Hungarian Academy of Sciences, PO.
Lattice structure of 4H polytype provides two inequivalent lattice sites as cubic (k) and hexagonal (h) giving rise to four different VSiVC configurations termed as hh, kk axial and hk, kh basal configurations where the first letter denotes the site of VSi and the second one stands for the site of VC.
Formation energies of the four possible VSiVC defect structures differ only slightly, thus all VSiVC configurations should form with nearly the same concentration.Computational Approach Electronic structures of VSiVC configurations were calculated by means of ab initio DFT with the Heyd-Scuseria-Ernzerhof (HSE06) exchange-correlation functional [6] as implemented in Vienna Ab Initio Simulation Package (VASP) [7].
Lattice structure of 4H polytype provides two inequivalent lattice sites as cubic (k) and hexagonal (h) giving rise to four different VSiVC configurations termed as hh, kk axial and hk, kh basal configurations where the first letter denotes the site of VSi and the second one stands for the site of VC.
Formation energies of the four possible VSiVC defect structures differ only slightly, thus all VSiVC configurations should form with nearly the same concentration.Computational Approach Electronic structures of VSiVC configurations were calculated by means of ab initio DFT with the Heyd-Scuseria-Ernzerhof (HSE06) exchange-correlation functional [6] as implemented in Vienna Ab Initio Simulation Package (VASP) [7].
Online since: August 2013
Authors: De Gang Fu, Xiao Xia Lin, Yuan Feng Ye, Ling Yun Hao
Fig. 1 XRD patterns of THs and V-THs-1.5 Fig. 2 TEM image of V-THs-1.5
The detailed structure of the V-THs-1.5 revealed by TEM is shown in Figure 2.
The strong contrast between the dark edges and bright centers indicates the hollow structure of TiO2 hollow spheres.
The surface area and pore structure data of samples are given in Table 1.
Sci., Vol. 257 (2011), p. 7276 [10] JJ Xu, YH Ao, DG Fu, CW Yuan, Journal of Physics and Chemistry of Solids.
The strong contrast between the dark edges and bright centers indicates the hollow structure of TiO2 hollow spheres.
The surface area and pore structure data of samples are given in Table 1.
Sci., Vol. 257 (2011), p. 7276 [10] JJ Xu, YH Ao, DG Fu, CW Yuan, Journal of Physics and Chemistry of Solids.
Online since: March 2013
Authors: A. Kazemi Babaheydari, M. Asad-Zadeh, F. Mohammadi
Asad-Zadeh2, F.Mohammadi2
1Department of chemistry, Faculty of Science, Islamic Azad University, Shahrekord branch, Shahrekord, Iran
2Department of Materials Science, Faculty of Engineering, Shahrekord University, Iran
Kazemibali@gmail.com
Keywords: Nano pigment; composite cement; mechanical properties.
Compared with the case of dense structure matrix such as polymer, the situation is quite different in the area of cement matrix composites, because cement-matrix has relative loose structure.
- Nanoparticles favor the formation of small-sized crystals (such as Ca (OH) 2 and AFm) and small-sized uniform clusters of C–S–H, Nanoparticles contribute in the pozzolanic reactions or accelerate them, resulting in the consumption of Ca (OH)2 and formation of an “additional” C–S–H gel - Nanoparticles improve the structure of the aggregates’ contact zone, resulting in a better bond between aggregates and cement paste - Nanoparticles provide crack arrest and interlocking effects between the slip planes, which improve the toughness, shear, Flexural and flexural strength of cement-based materials [4].
Compared with the case of dense structure matrix such as polymer, the situation is quite different in the area of cement matrix composites, because cement-matrix has relative loose structure.
- Nanoparticles favor the formation of small-sized crystals (such as Ca (OH) 2 and AFm) and small-sized uniform clusters of C–S–H, Nanoparticles contribute in the pozzolanic reactions or accelerate them, resulting in the consumption of Ca (OH)2 and formation of an “additional” C–S–H gel - Nanoparticles improve the structure of the aggregates’ contact zone, resulting in a better bond between aggregates and cement paste - Nanoparticles provide crack arrest and interlocking effects between the slip planes, which improve the toughness, shear, Flexural and flexural strength of cement-based materials [4].
Online since: June 2015
Authors: M. Rusop, M.H. Mamat, Mohd Husairi Fadzilah Suhaimi, Kevin Alvin Eswar, Haseeb A. Khan, Salman A.H. Alrokayan, J. Rouhi
XRD analysis confirms the wurtzite structure of ZnO nanorods.
The strong intensity of the (002) peak indicates that the ZnO structure has a preferential growth direction along the c-axis [17].
Abdullah, Hydrothermal growth of flower-like ZnO nanostructures on porous silicon substrate, Journal of Molecular Structure, (2014)
Park, Vertically aligned sulfur-doped ZnO nanowires synthesized via chemical vapor deposition, The Journal of Physical Chemistry B, 108 (2004) 5206-5210.
The strong intensity of the (002) peak indicates that the ZnO structure has a preferential growth direction along the c-axis [17].
Abdullah, Hydrothermal growth of flower-like ZnO nanostructures on porous silicon substrate, Journal of Molecular Structure, (2014)
Park, Vertically aligned sulfur-doped ZnO nanowires synthesized via chemical vapor deposition, The Journal of Physical Chemistry B, 108 (2004) 5206-5210.