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Online since: April 2016
Authors: Yi Fei Wang, Yan Zi Gou, Qian Ce Zhang, Teng Fei Mao, Nan Wu, Xuan Tong
The structures, elemental compositions and molecular weights were characterized by FT-IR, NMR, EDS and GPC, respectively.
The homopolymerization of ferrocenyldimethylsilane was simulated using computational chemistry method.
Moreover, the molecular weight, structure and composition of block copolymers PS-b-PFS, were successfully controlled by changing the ratio of styrene, n-butyllithium and ferrocenyldimethylsilane.
The polymerization mechanism, as well as the molecular weights, structures and compositions of the ceramic precursors were investigated.
Fourier transform infrared spectroscopy (ZRY-1P FT-IR, Perkin Elmer, USA)was used to determine chemical structures of precursors. 1H-NMR spectra were recorded by NMR measurements(400/54/ASP, Agilent Technologies, USA).
Online since: January 2016
Authors: Ab Aziz Abdul Latiff, Zawawi Daud, Halizah Awang, Mohd Zainuri Mohd Hatta
The morphology was observed by Scanning Electron Microscopy (SEM), which showed a condensed composition of fiber structure.
The condensed fiber is significance to the structure of the paper produced from the non wood material.
Furthermore, SEM analysis by corn stalk fibre shows the condensed arrangement of fiber, which from a strong fiber structure of corn stalk.
Jimenez, Journal of Industrial Engineering Chemistry. 11 (2005) 387 - 394
Online since: July 2011
Authors: Xue Gang Luo, Chun Yan Zhang, Juan Feng, Jia Quan Rao, Xiao Yan Lin
Results show that the rough surface, loose internal structure and hydroxy and amide groups of the distillers' grains are beneficial to the adsorption of Cu2+ and Pb2+ in the wastewater.
It can be found that distillers' grains particles have larger surface area and loose structure feature which may be propitious to its adsorption ability.
Effect of pH. pH is one of the most important environmental factor which influences not only site dissociation, but also the solution chemistry of the heavy metals: hydrolysis, complexation by organic and inorganic ligands, redox reactions, and precipitation are strongly influenced by pH and on the other hand, strongly affects the speciation and the biosorption availability of the heavy metal [6].
Conclusions Distillers' grains with hydroxy and amide groups, rough surface and loose internal structure which are beneficial to binding heavy metal ions, is a kind of low-cost, abundant and locally available and environment-friendly adsorbent.
Online since: April 2024
Authors: Riza Muhida, Agus Geter Edy Sutjipto, Ari Kurniawan, Tia Tanjung, Rifki Muhida, Muhammad Riza, Bambang Pratowo, Ahmad Cucus, Taqwan Thamrin, Zein Muhamad
The crystallinity of poly-Si grown above the V-shape structure has worsened, as compared to poly-Si grown above the Λ-shape structure, according to the TEM and SAED pictures.
Material and Method The structure of poly-Si solar cells is illustrated in Fig. 1, which is composed of Ag-grid/ZnO (800 Å)/p-i-n/ZnO(1000 Å)/Ag(1000 Å)/SnO2/glass (Corning #7059).
The SAED images were taken above the V-shape (a) and Λ -shape (b) structures of the substrate.
The crystallinity of poly-Si grown above the V-shape structure has worsened, as compared to poly-Si grown above the Λ -shape structure, according to the TEM and SAED pictures.
[3] Subhashis Samanta, Debajyoti Das, Nanocrystalline silicon thin films from SiH4 plasma diluted by H2 and He in RF-PECVD, Journal of Physics and Chemistry of Solids, Volume 105, (2017), Pages 90-98
Online since: February 2018
Authors: Jian Wen Shi, Dan Dan Ma, Ya Jun Zou
Polyethylene glycol, with different added content, was added as a structure-directing agent.
Porous structure is formed after calcinations because the structure-directing agent is demolished from the composites in high temperature.
The formation of pore structure is help to improve the surface area of TiO2.
Crystal Structure of Samples.
Cheng, Synthesis of TiO2 porous thin films by polyethylene glycol templating and chemistry of the process, J.
Online since: May 2011
Authors: Qing Wang, Gang Xu, Hong Fang Fei, Yi Min Wang
Introduction Steel corrosion is the most important reason causing concrete structure durability problems.
In order to prolong natural life of structure, Academic and civil engineering field put forward various ways to prevent and postpone the steel corrosion, thereinto, the use of stainless steel is becoming the preferred reliable method [1-3], it can be ensured that the concrete structures resist the severe erosion effectively.
In some countries, stainless steel has already been ranked among reinforcements in concrete structures, and has been applied in the structures of more than 100 years design life time in some serious corrosion environment [4,5].
In order to explore deeply the applicability of stainless concrete structures in the complex corrosion environment, by the method of electricity migration, the characteristics of the stainless steel in concrete structure are researched on in stray current and chlorate coupling, which can provide reference for structures design and construction in the corresponding special environment such as underground engineering.
The specific reasons will be found through the micro, meso physics and the chemistry measurement, but this phenomenon enlighten us, under the environment of stray current and chlorate coupling, the concrete structures with the ordinary and stainless steels, especially pay attention to preventing corrosion of the stainless steel.
Online since: October 2015
Authors: Duongruitai Nicomrat, Jirasak Tharajak
However, the swollen structure of banana peels during copper (II) filtration caused limit filtration efficiency to 4-5 hour extraction period.
Chemistry 4 (4) (2010) 361-377
Online since: October 2006
Authors: Sven Öberg, M.I. Heggie, G. Savini
Figure 1: Projections on the glide plane of the partial dislocations and the respective band structures.
The Si-core structure shows a Si-Si bond length of 2.38 Å, expanded by 1.7 % with respect to bulk silicon 2.34 Å.
The band structure analysis gives a half filled band ranging from Ev+0.21 eV to the bottom of the conduction band (CB).
Due to the strong reconstructions, the band structure analysis shows that the 30° AR partials have no deep state.
Therefore these structures have no deep states, in agreement with the previous work [3].
Online since: March 2007
Authors: Min Wang, Naznin Sultana
The porous structures of scaffolds were studied using scanning electron microscopy (SEM, Stereoscan 440, UK).
Scaffolds made from emulsions having 2.5% w/v PHB or PHBV had unsteady, physically weak structures.
SEM examinations showed that the porous structures of scaffolds from 7.5% (w/v) PHB and PHBV solutions were very similar (Figs. 1b and 1c).
At low concentration (5%) of HA, HA/ PHBV scaffolds maintained internal ladder-like pore structure which is similar to that of PHB and PHBV scaffolds.
Trau, Australian Journal of Chemistry, 54 (2001), 621-623
Online since: June 2012
Authors: Da Ming Chen, Yan Yuan Liang, Jiang Feng Tong
After geometry optimization process, The α-Al2O3 unit cell was formed( Figure 1b) which has a hexagonal cell structure, with a rhombehedral primitive cell consisting of 10 atoms.
ABCDABCDABC (cleavage) DABCD and the resultant structures are depicted in Figure 1c-f.
Structure of bulk alumina crystal and slabs of cleaved α-alumina crystal Table1.
So the crystal structure was actually determined by the crystal face with high growth rate.
,Scherer,G.W.Sol-Gel Science.The Physics and Chemistry of Sol-Gel Processing[M].