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Online since: September 2012
Authors: Abhijit J. Suryawanshi, Jessica Lamb, Victoria J. Gelling
It should be noted that the chemistry of ozone in water is complex with a variety of mechanisms reported in the literature.
[14] Cheng, Q., et al., Surfactant-assisted polypyrrole/titanate composite nanofibers: Morphology, structure and electrical properties, Synthetic Metals, 158 (2008) 953-957
Perhydroxyl (HO2)/hyperoxide (O2-) and HO3/O3- as intermediates, The Journal of Physical Chemistry, 88 (1984) 2560-2564
Bruckenstein, Electrochemical reduction of ozone in acidic media, Analytical Chemistry, 40 (1968) 482-488
Lee, Structure and properties of poly (acrylic acid)-doped polyaniline, Macromolecules, 28 (1995) 2858-2866
Online since: May 2013
Authors: Jia Yu Han, Yi Du Yang
Keywords: Eigenvalue Problem, Hydrogen atoms electronic structure, Spectral Element Method.
In this paper, the spectral element methods are adopted to solve the eigenvalue problem of hydrogen atoms electronic structure.
This problem, as a hot issue in physics and mathematics and a conundrum in modern electronic structure computations, is widely applied in materials science and quantum chemistry (see [3, 8]).
Zhou, Finite element approximations for Schrödinger equations with applications to electronic structure computations, Comp.
Martin, Electronic Structure: Basic Theory and Practical Methods, Cambridge University Press, London, 2004
Online since: September 2013
Authors: Su Min Cui, Li Li Ren, Feng Chao Cao
Futhermore, after heat treatment, the diversity of hard templates available dopped in the interior structure of alumina could be eliminated, and faithfully duplicate both in the stomatal arrangement and netwok structure could be remained.
Another important reason, hexamethyl disilylamine has the special structure –Si–(CH3)3.
Due to the special properties of adopted volatile solvent, such as reducing structure collapse owing to the special structure, we can easily get the desired primary sample after disposed in low vacuum condition.
Due to the special hydrophobic structure of hexamethyl disilylamine, the collapse of the mesoporous structure of the mesoporous alumina, which leaded by the condensation reactions of –OH groups on the surface, got greatly reduced under the drying condition.
Scherer, in:Sol-Gel Science: The Physics and Chemistry of Sol-Gel Processing, Academic Press, (1990) [9] L.
Online since: February 2023
Authors: Dhuha Hussain Mohammed, Raghdaa Kareem Jassim
The roughness, chemistry, topography, and wettability of an implant surface may affect cell function, adhesion, and viability [11].
The results showed the polycrystalline structure of the pure Ge phase.
As indicated above, Ge-coat altered the surface properties and chemistry of Zr implants by increasing hydrophilicity and surface roughness.
These structures were highly adhesive to each other and to the surface and did not leave any gaps.
Albrektsson, Classification of osseointegrated implant surfaces: materials, chemistry and topography, Trends in biotechnology 28(4) (2010) 198-206
Online since: September 2012
Authors: Ming En Guo, Zu Li Sun, Zhi Ning Yu
Structure and Technics Research on Composite Ship T-joint Mingen Guo1, a, Zuli Sun2,b and Zhining YU1,c 1School of Mechatronic and automobile Engineering, Yantai University, Yantai, China 2Science and Engineering College of Chemistry and Biology, Yantai University, Yantai, China aguo_ming_en@163.com, bsunzuli98@163.com, cznyyd@tom.com Keywords: composite ship, T-joint, structure and technics, destructive strength.
They are the weak positions in ship structure on mechanical properties aspect.
Through experiments, the effects of structure size and technics on joint deformation and destructive strength were researched.
Researches on T-joint performance influenced by structure and technics are rare.
Experiments Structure and material of joint.
Online since: March 2015
Authors: Jun Jun Zhang, You Dong Xu, Jian Qing Xiong, Shi Guang Xu
China 2School of Chemistry and Chemical Engineering, Guangdong Pharmaceutical University, Zhongshan 528458, P.R.
In this work, the green chemistry conversion coating on AZ31 magnesium alloy surface was made and studied by means of Ce(SO4)2·2(NH4)2SO4·4H2O and MnSO4 as inhibitor, H2O2 as oxidant, NaCl as accelerator, CH3COOH as stabilizer.
The constant phase element CPEc and Rc are surface coating capacitance and resistance associated with porous structure and defects of coating, respectively.
Online since: October 2018
Authors: Yuriy V. Yurkin, D.V. Cherkasov, V.V. Avdonin
To work out effective damping materials it is necessary to perfect analytical dependences linking dynamic properties of a composite with its structure-forming parameters.
Introduction To receive composite materials with effective damping properties, first of all, it is necessary to position analytical dependences, allowing to connect damping properties of a composite with structure and properties of constituents.
In spite of a great number of papers devoted to a question of physics and chemistry of interfacial layers, the quantitative data about their mechanical characteristics practically miss.
The offered decision will allow to predict more precisely mechanical dynamic properties of polymeric composites depending on their structural-based elements and will provide optimization of its structure without using expensive experiments.
Fizicheskaya khimiya napolnennykh polimerov [Physical chemistry of filled polymers], Moscow, 1977
Online since: April 2016
Authors: Vladislav Krzyzanek, Kamila Hrubanova, Petr Sedlacek, Ota Samek, Filip Mravec, Dan Kucera, Pavla Benesova, Ivana Marova, Leos Doskocil, Stanislav Obruča
Benesova1,3, and Ivana Marova1,3 1Materials Research Centre, Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00 Brno, Czech Republic. 2Institute of Scientific Instruments, v.v.i., Czech Academy of Sciences, Kralovopolska 147, 612 64 Brno, Czech Republic. 3 Department of Food Chemistry and Biotechnology, Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00 Brno, Czech Republic
Furthermore, when investigated by Cryo-SEM, the PHB containing cells showed needle-type plastic deformations while these structures were absent in the cells without polymer.
In PHB containing cells, needle-type plastic deformations were observed while these structures were absent in cells without polymer.
Synthesis, structure and properties of polyhydroxyalkanoates: biological polyesters.
The biological and physical chemistry of polyhydroxyalkanoates as seen by NMR spectroscopy.
Online since: March 2011
Authors: Han Jian, Yie Guo
molecule was 2-4,At the same time,the MTPF during initial stage still has a certain amount of medium outcome hydroxymethyl phenol which was formed through the addition reaction between phenol and formaldehyde.The detection result,from the MTPF during initial stage through ZEN3600 nanometer grain analysis instrument, proved that the grain size of the MTPF during initial stage was about 80-180nm,and the distribution of the grain size presented a normal one that the grain size 96-130nm was about 67%. 1 Introduction The phenol formaldehyde resin(PF),with high resistant water and high bond strength,is a kind common Adhesive in the production of wood-based panel.Phenol formaldehyde resin may divide into three kinds of categories,high temperature type(curing temperature140-150℃),medium temperature type(105-115℃)and normal temperature type[1].The phenol formaldehyde resin refered in this paper was a PF used in bamboo plywood.The molecule weight and molecule weight distribution are important chemistry
property of PF resin,and many literatures conducted study on the chemistry properties of PF resin[2-5].Some methods,such as gas chromatogram needing a Gasification process to PF resin,have a certain difficulty in analysis and representation to PF resin because of poor resistant heat of PF resin.Liquid Chromatogram(LC), because of keeping the state of PF resin no to change,can analyse more accurately to PF resin, so that the molecule weight and distribution of molecule weight of the MTPF resin were researched in this paper through LC-MS[6],at the same time,the grain size of the MTPF was researched and characterized through ZEN3600 nanometer grain analysis instrument. 2 Material and method MTPF resin:solid content 38.65%; free phenol content 1.85%;brominable substance content 14.2%;viscosity 900~1300×10-3Pa·s; water combination > 30times;pH 10.82;polymerization time 3′20″;density 1.19g/cm3.
Resin during initial stage have the structure and outcome as follow[7]: The total ion chromatogram of MTPF resin ,presented in Figure 1,could get through detecting with LC-MS instrument.
Reference [1] Kai wang.Wood industry practical technology (Adhesive volume).Beijing,China Forestry Publishing House,(1996) [2] Y.Zhang X,Lu A.Pizzi.Mod Plast,81(11),pp.47-54,(2004) [3] Wang R M.Toughening Cashew nut phenolic resin by polyarletherketone with cardo.49th Int'I Sampe Symposium,pp.168-174,(2004) [4] Marra A.Technology of wood Bonding, vannostrand Reinhold,pp.39-43,(1992) [5] Dingguo Zhou,Xiaowei Zhang.Heat curing resin.Chemistry ecnomy,56 (4),pp.76-79,(2005) [6] Shiling Yu.High Performance Liquid Chromatography and application.Beijing,Chemical industry press,(1999) [7] Jiyou Gu.Adhesive and paint.Beijing,China Forestry Publishing House,(1999)
Online since: October 2011
Authors: Meng Ye, Qi Zhuang He, Rui Chen, Jin Huang
The structure of the materials was confirmed by Powder X-ray diffraction.
Its data indicated that the structure of ZVI-SBA-15 retained the host SBA-15 structure.
The polymeric structure-directing agent was removed by clination at 823K for 6h in air.
P., Eds.; IUPAC Environmental Analytical and Physical Chemistry Series; Lewis Publishers: Chelsea, MI, 1993
,“Reporting physisorption data for gas/solid systems with special reference to the determination of surface area and porosity,” Pure and Applied Chemistry, vol. 57, no. 4 (1985) , p. 603–619