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Online since: December 2012
Authors: Zahira Yaakob, Ibrahim Yakub, Masita Mohammad
The impregnation with ZnCl2 had shown dehydration of cellulosic material while further dehydration that causes charring and aromatization of the carbon sheets which create pore structure occur during carbonization.
As the elemental and surface functional groups analysis determine the composition and surface structure of the carbon respectively, zeta potential analysis determines the performance of the activated carbon based on the surface charge distribution which is shown in Fig. 4.
The effects were the aided in removal of oxygen molecules, the increased in carbon composition and the interstices between the molecules, the increase in surface area, the modification of the pore structure from mesoporous to microporous, and from aggregates of plate-like particles to narrow slit-like pores, as well as the improved of surface charge distribution of the carbon.
Cazorla-Amoros, in: Chemistry and Physics of Carbon, edited by L.R.
Online since: January 2013
Authors: Jian Ning Zhang, Xiao Liu, Hui Zhu, Hu Jie Lu, Ying Li, Yan Jun Zhang
The development of scanning probe microscopy (SPM), such as tapping-mode atomic force microscopy (AFM) [13] and non-contact scanning ion conductance microscopy (SICM) [14-16], allows us to study 3D cell membrane structures on a nanometer scale and in real-time.
Thus, their results suggested that the susceptibility and membrane damage to respiratory epithelium following inhalation of NMs will depend on their surface chemistry and nano-size [22].
Published results demonstrate that non-contact HPICM combined with patch-clamp offers an ideal high-resolution imaging technique not to interact/interfere with living cells during image acquisition, and provides detailed information about the relationship between membrane structures and ion-channel functions of living epithelial cells at the same time, which has the potential to become a powerful microscopy for real-time studies of NM-cell interactions under physiological conditions.
Ochs, P.Gehr, Interactions of nanoparticles with pulmonary structures and cellular responses, Am J Physiol Lung Cell Mol Physiol. 294(5) (2008) L817-L829
Online since: October 2015
Authors: Hasan Zuhudi Abdullah, Maizlinda Izwana Idris, Mohamad Ali Selimin
Where, Ti metal with the anatase and/or rutile crystal structure films showed excellent apatite-forming ability and produced a compact apatite layer covering all the surface of Ti after soaking in simulated body fluid (SBF), but titanium metal with amorphous titania layers was not able to induce apatite formation [10].
The anatase and/rutile crystal structure films were formed on the grey colour of Ti surface.
This crystal structures are excellent for apatite forming ability and produced compact apatite layer on Ti surface after soaked in simulated body fluid (SBF) [17].
Michler, Electrolytic deposition of titania films as interference coatings on biomedical implants: microstructure, chemistry and nano-mechanical properties, Thin Solid Films, 494 (2006) 279 – 286
Online since: March 2008
Authors: B.S. Jin, Y.F. Jiao, G. Li
Normally, the combustion process is composed of two steps: chemistry transition (burn initially) and structure transition (secondary chemical transitions).
The formulas are as the follows: 4Fe2O3+6A1 → 3A12O3+3FeO+5Fe (1) 3FeO+2A1 → A12O3+3Fe (2) The diffusion combustion controls the process of structure transformation, and in turn controls the converting rate of Al2O3 and Fe through the SHS reaction.
Structure and mechanical characterization of Ti/TiC cermet coatings synthesized by lasher melting[J].Surf Coat Technol, 1997,88 (1-3): 204-211
Online since: February 2019
Authors: E.A. Devyatykh, T.O. Devyatykh, A.N. Boyarsky
A method for extracting platinum from spent catalysts is known, in which the ground catalyst is mixed with powdered carbon, briquetted, and to remove volatile components from the coal and produce a porous briquette structure, it is processed at a temperature of 800 °C.
Dokukina, Investigation of the structure and properties thermal protection plasma coatings, Problems of Mechanical Engineering and Automation, 3 (2011) 91-96
Dokukina, Theoretical studies of the formation of mesostructured-ordered cluster structures in plasma coatings, Problems of Mechanical Engineering and Automation. 4 (2009) 106-112
Fainer, Phase composition of thin silicon carbonitride films by means of plazma endensive chemical vapor deposition using organosilicon compounds, Journal of Structural Chemistry. 56 (2015) 163-174
Online since: January 2018
Authors: Athanasios G. Mamalis
The as-received material structure is seriously altered through the deformation processing, therefore, materials testing and quality control before and after processing are predominantly the areas of interest to the materials scientist.
Similar shockwave techniques, (explosive / electromagnetic compaction, high temperature / high pressure) and subsequent material processing are employed for their production, see Ref [7] for details. 3.3 Transport Crashworthiness of vehicles is related to the mechanism, that a proportion of the energy due to impact loading is absorbed by the collapsing structure, whilst a small amount is transferred to the passenger in order to improve the crash resistance of the vehicle.
An outline of my, over 40 years, extensive work on the crash mechanism of metals, polymers, composite materials and advanced hybrid composite structures, related to surface transport (motorcars, see Fig. 4, and railstock) and aeronautics (aircraft and helicopters) as well as to crash biomechanics is presented in Refs. [9, 10].
Biological Physics and Chemistry, 7(2007), 3-5 [10] A.
Online since: September 2013
Authors: Hui Ming Fan, Cheng Zhang, Ya Qi Ma, Jian An Liu
The molecular structure of prepared waterborne polyurethane was characterized by FT-IR spectroscopy (as shown in Fig. 1).
The structure of prepared polyurethane was characterized by Fourier infrared spectrometer (FT-IR), through observing by SEM, castor oil-based waterborne polyurethane had excellent film forming performance on paper surface, the results indicated that the castor oil performed much better in preparing WPU.
Chemistry and Adhesion.
[10] Zeng M, Zhang L N, Zhou Y X: Effects of solid substrate on structure and properties of casting waterborne polyurethane /carboxymethyl-chitin films.
Online since: April 2009
Authors: Anna Boczkowska, Tadeusz Niezgoda, Wiesław Szymczyk, Konrad Zubko
Experimental Validation of Numerical Methods of MRE Simulations Wiesław Szymczyk1 , Anna Boczkowska2 , Tadeusz Niezgoda1 , Konrad Zubko 3 1 Military University of Technology, Faculty of General Mechanics Kaliskiego Str. 2, 00-908 Warsaw, Poland, e-mail: w.szymczyk@wme.wat.edu.pl 2 Warsaw University of Technology, Faculty of Materials Science and Engineering, Woloska 141, 02-507 Warsaw, Poland 3 Military University of Technology, Faculty of New Technologies and Chemistry, Kaliskiego Str. 2, 00-908 Warsaw, Poland, e-mail: kzubko@wat.edu.pl Keywords: magnetorheological elastomer, FEM modeling, magneto mechanical coupling Abstract.
This causes that the particles tend to group and form structures like chains.
Microphotograph of a MRE's structure: chains of carbonyl particles Magneto mechanical coupling problem Numerical calculations were performed on the MSC Patran-MARC platform.
Micromechanical model of an elastomer filled with particles organized in chainlike structures.
Online since: March 2007
Authors: Zhong Sheng Liu, Da Tong Song, Qian Pu Wang, Michael Eikerling
A Mathematical Model of Ultra-thin Catalyst Layer in PEFC Qianpu Wang1,a , Michael Eikerling1,2,b , Datong Song 1,c and Zhong-Sheng Liu 1,d 1 National Research Council, Institute for Fuel Cell Innovation 3250 East Mall, Vancouver, BC, Canada V6T 1W5 2 Department of Chemistry, Simon Fraser University Burnaby, BC, Canada V5A, 1S6 a qian.wang@nrc.ca, bmichael.eikerling@nrc.ca, c datong.song@nrc.ca, d simon.liu@nrc.ca, Keywords: proton exchange membrane fuel cells, modeling, catalyst layer, Pt utilization, PoissonNernst-Planck theory Abstract.
Introduction There are two basic types of catalyst structures generally known and commonly used in polymer electrolyte fuel cells (PEFC), viz. conventional and ultra-thin catalyst layers (CL).
Relations between structure, properties, processing and performance have been established [3].
Due to the three-phase composite structure, only a fraction of the CL is utilized and the overall Pt utilization is still low.
Online since: March 2010
Authors: Cengiz Kaya
Current Status of Oxide Fibre-Reinforced Oxide Ceramic Matrix Composites for Gas Turbine Applications Cengiz Kaya Yildiz Technical University, Faculty of Chemistry and Metallurgy, Department of Metallurgical and Materials Engineering, Davutpasa Campus, Esenler, Istanbul, Turkey cengizk@yildiz.edu.tr Keywords: Oxide ceramic; Oxide fiber; Composite; Microstructure Abstract.
The "green bodies" containing 12 impregnated fiber mats were then stacked in a warm pressing device to compress and consolidate the multilayer structure at 180 oC for 2 h.
Results and Discussion Optical microscopy images of the composite plates and mini-composite produced after pressureless sintering at 1200 oC for 2 h are shown in Fig.1. indicating that a homogeneous and macro-flaw free surface structure of the plate (Fig.1a) and tubular composite (Fig.1b) was obtained.
This fine porosity is related to the presence of ultrafine yttria particles (10 nm) within the matrix that act as sintering additives and provide a more homogeneous matrix structure in terms of density and pore size distribution.