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Online since: April 2020
Authors: Sri Sudiono, Mellia Harumi, Dian Hana Saraswati, Triyono Triyono
The crystalline structure of adsorbent was analyzed using XRD and gave 4 peaks characteristics of gold metal on 2ϴ = 38º, 44º, 64º, and 77º after adsorption which indicated the reduction of Au(III) ions into Au(0).
HCl, NaOH, HAuCl4 1000 ppm (this solution was made by Sri Sudiono), CuCl2.2H2O, distilled water (made by Laboratory of Basic Chemistry FMIPA UGM), and Whatman 42 mesh filter paper.
X-ray diffractogram analysis was performed to compare the crystallinity of mangosteen rind structure before and after an interaction.
From Fig. 5a, it showed that before interaction, mangosteen rind did not have a crystalline structure but more amorphous.
Au3+ + 3 Ar-OH ⟶ Au0 + 3 Ar=O + 3 H+ The characteristic peaks in diffractogram showed a reflection of fields [111], [200], [220], and [311] which were the structure from face-centered cubic (fcc) with an average atomic distance of 4.10 Å. 2ϴ (deg) 9a Figure 5.
Online since: October 2011
Authors: Ismail Fatiha, Aziah Buang Nor, Muhammad Zamir Othman
Raman Spectroscopy and Field Emission Scanning Electron Microscopic Studies on Carbon Nanomaterials NOR Aziah Buanga, FATIHA Ismailb and Muhammad Zamir Othmanc Department of Chemistry, Faculty of Science, Universiti Teknologi Malaysia, 81310 Johor Bahru, Johor, Malaysia.
It provides information on the vibration of crystal lattice, electron structure and regularity of crystal structure of the graphitized carbon materials.
Introduction Raman spectroscopy has provided an exceedingly powerful tool for the characterization of carbon nanomaterials which provides information on carbon nanomaterials such as vibration of crystal lattice, electron structure and regularity of the crystal structure [1].
Generally, there are three peaks that can be observed as an indication of the carbon nanomaterials structure.
Hence, the evolution of the D band has contributed to the main identification of the carbon nanomaterials structure.
Online since: February 2016
Authors: Sergey M. Martemyanov, E.V. Shvagrukova, Andrey A. Bukharkin, Ilia A. Koryashov, Asemgul A. Isemberlinova
The continuous PD activity initiates treeing, i.e. growth of the tree-type discharge structures called dendrites.
Treeing is a growth of discharge structures in a volume of a non-conductive or weakly-conductive material.
Morphology of the formed structures depends also on their conductivity.
Oil shale is a layered material with a rather heterogeneous structure at the micro- and macrolevel.
Sutton, On the structure and chemistry of electrical trees in polyethylene, J.
Online since: July 2024
Authors: Jing An, Wen Fang Xing, Hai Yun Zhang, Dan Yong Wang, Shu Hu Li, Hua Zhen Wei
Prediction of Mechanical Properties of PBO Microfibers 2.1 Establishment of PBO Microfibril Model PBO fiber belongs to crystal structure.
Kohji Tashiro [9] proposed the model of PBO crystal and molecular structure on the basis of X-ray diffraction.
In order to approach the actual fiber structure, this study established a PBO microfiber model with a " sheath-core " structure.
Fig. 3 The " sheath-core " structure Morphology of PBO fiber[10] Fig. 4 The sketch map of AS-type PBO fiber structure[9] Fig.5 PBO fiber "skin core" structure microfiber model 2.2 Molecular Dynamics Study of PBO Microfibril Model After the preliminary construction of the model, the total energy inside the molecular system is too high and it is in a highly unstable state of configuration.
The main reason is that a PBO model with a " sheath-core " structure was established in MD simulation, which is more similar to the actual fiber structure.
Online since: April 2014
Authors: Gan Xin Jie, Xiao Dong Zhang, Li Fen Hu, Jian Peng, Jun Wang, Hao Feng, You Ji Tao
Structure evolution of α- and β-polypropylenes upon UV irradiation: a multiscale comparison.
The α-nucleating agent use in this work is sorbitolum compound which is traded as ZC-3, supplied by Yantai Zhichu Synthetic Chemistry Co., Ltd.
The role of physical structure and morphology in the photodegradation behavior of polypropylene.
The phenomena can be understood from the different crystal structure and size.
Besides, there are different crystal structures for α-modification and β-modification, photodegradation behavior may be dependent of crystal structure, but it needs further investigation.
Online since: April 2009
Authors: Celeste M.C. Pereira
Introduction An increasing number of structures are being made from fiber reinforced composites.
This structure is formed in two steps [5]: firstly, an intercalated structure char/metal oxides is formed and then, during after-glowing, the intercalated carbonaceous residue is oxidized to CO and CO2 by a reaction that is catalysed by the metal oxides themselves.
[7] Taviot-Gueho, C., Leroux, F., Structure and Bonding 119 (2006) 121
[8] Trifiró, F., Vaccari, A., Solid State-Supramolecular Chemistry: two and three-dimensional inorganic network.
Comprehensive Supramolecular Chemistry, vol. 7.
Online since: November 2012
Authors: Jan Fikáček, Jan Prokleška, Jiří Prchal, Ivana Císařová, Vladimír Sechovský
Above room temperature range, the CeRuSn structure is a monoclinic modification of CeCoAl-type structure where the unit cell is doubled along the c-direction with respect to the CeCoAl itself.
Below the transition, the structure is tripled along the c-direction, which was in the previous work [4] explained by a different stacking sequence of cerium layers.
The magnetic structure has not been determined yet.
We expect that this can be a consequence of more complicated structure with competing modulations as it had been discussed by Feyerherm et al. [4].
That points on the existence of a non-zero region where the third different crystal structure of CeRuSn appears.
Online since: September 2011
Authors: Xin Qi
Synthesis and Characterization of Strong Polar Macroporous Resin Made from Cellulose Xin Qi College of Polymer Chemistry and Physics Northeast Forestry University Harbin, China qixin_8569@163.com Keywords: Cellulose; Crosslink; Macroporous resin; Static adsorption.
The macroporous adsorption resin synthesized in this experiment uses cullulose as monomer, adipoyl dichlorid as crosslinker, and cyclohexane as porogenic agent, which three corsslink and polymerize each other, forming the porous skeletal structure.
This phenomenon can be explained from the molecular structure of rutin: rutin belongs to saponin, while the aglycon which is the component of saponin is of the category of sterides and triterpenses, when they connect to glycosyl and form glucoside, the matter obtains strong polarity.
Conclusions (1)The macroporous adsorption resin synthesized in this experiment uses cullulose as monomer, adipoyl dichlorid as crosslinker, and cyclohexane as porogenic agent, which three corsslink and polymerize each other, forming the porous skeletal structure.
Journal of Photochemistry and Photobiology A: Chemistry, 2007. 186(2-3): p. 369-375
Online since: January 2013
Authors: Shao You Liu, Qing Ge Feng, Fei Zhang, Chen Yan Luo, Tian Zhi Jiang
It shows a type IV isotherm with the H1 hysteresis loop, characteristic of the mesoporous structures.
The clear mesoporous structure, the pore size and crystalline pore walls can be easily found.
Many ordered microporous /mesoporous structure with sets of clearly oriented lattice fringes were observed.
It is due to the different nature of template controlling material surface structure.
Yamaki, H.Itoh, K.Asai, Analysis of electronic structures of 3d transition metal-doped TiO2 based on band calculations, J.
Online since: October 2018
Authors: Azamat A. Zhansitov, Artyr E. Baikaziev, Azamat L. Slonov, Marina M. Murzakanova, S.Yu. Khashirova
It is shown that in the production of fine fibers from polyether ether ketones, a predominantly amorphous structure is formed.
Lower molecular weight polyether ether ketone is characterized by a higher rate of crystallization and the formation of a more homogeneous crystalline structure.
PEEK 90 is characterized by higher stiffness values ​​compared to synthesized PEEK (KBSU), which apparently also results from a higher crystallinity of this polymer, as shown by DSC studies, since crystallites are rigid structures.
Conclusion Thus, it was revealed that the production of fine fibers from PEEK is mainly formed by an amorphous structure.
Khashirova, Synthesis and properties of polyether ether ketones for 3D printing, Fibre Chemistry. 49 (6) (2018) 414-419