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Online since: December 2009
Authors: Zhi Xiong Huang, Ming Zhang, Chuan Ji Zhang, Min Xian Shi
The structure of the target compounds and intermediates was conformed by the IR, 1H NMR and SEM.
The effect of monomer structure and mechanical properties has been investigated on the prepared polyesters.
As can be seen in the 10% FB composite of Fig. 5a, both thin and small fibrils, and some flat structures,were present.
In the composite with 30% FB and in the rest of the blends, as seen in Fig. 5c, the FB formed large and rather oriented structures.
Compared with that of the anlogous homopolyesters by other processing mode(injection moulding or melt moulding)[19,20,21],we can also seen that a will developed fibrils structure forms gradually and FB formed oriented structures,TLCP also show a self-fibrosis phenomenon.
Online since: February 2013
Authors: Jie Qin, Jin Wen Peng, Zhen Fan Liu, Riu Hua Mo, Yuan Wei Zhong, Wei Xing Deng
Star polymers have unusual solution and interfacial properties because of their branched structure and spatial shape.
To our knowledge, it is the first time to covalent tether polymer with such structure on silicon surface. 1.
The dots in the AFM images may be attributed to the structure of three-arm star NATHB covalent on the silicon surface.
Nicolay: Nature Chemistry, Vol. 1 (2009), p. 276
Merlin: Annual Review of Analytical Chemistry.
Online since: November 2012
Authors: G. Göller, Viorica Simon, Ipek Akin, Simona Cavalu, Cristian Ratiu, Vasile Rus
Titania versus Ceria alumina/zirconia composites: structural aspects and biological tolerance Simona Cavalu1,a, Viorica Simon2,b ,Cristian Ratiu1,c,Vasile Rus3,d, Ipek Akin4,e, Gultekin Goller4,f 1University of Oradea, Faculty of Medicine and Pharmacy,Oradea, Romania 2Babes-Bolyai University, Faculty of Physics & Institute of Interdisciplinary Research in Bio-Nano-Sciences, Cluj-Napoca, Romania 3USAMV Faculty of Veterinary Medicine,Cluj-Napoca, Romania 4 Istanbul Technical University, Materials Science Department,Turkey ascavalu@rdslink.ro bviorica.simon@phys.ubbcluj.ro,cratiu_cristian@yahoo.com, dvasilerus2002@yahoo.com eakinipe@itu.edu.tr, fgoller@itu.edu.tr Keywords: alumina/zirconia composites, structure, biocompatibility.
Due to its high oxygen storage capacity, associated with rich oxygen vacancies and low redox potential between Ce3+ and Ce4+, high thermal stability and strong corrosion resistance, hardness and stable structure, ceria could be alo utilized as a stabilizer in zirconia and/or alumina–zirconia systems [7,8].
Several in vitro and in vivo studies have demonstrated that the surface structure of implant abutments influences both the orientation and proliferation of connective tissue cells and inhibits epithelial downgrowth [16].
Wang, Surface modifications of bone implants through wet chemistry, J.
Online since: October 2010
Authors: A. Samadi Maybodi, S.K. Hassani Nejad-Darzi
Hassani Nejad-Darzib Analytical Division, Faculty of Chemistry, University of Mazandaran, P.O.Box: 47416-95447 Babolsar, Iran asamadi@umz.ac.ir, bhassaninejad@umz.ac.ir Keywords: (2-Hydroxyethyl) Trimethylammonium, Non-Aqueous, Ultrasonic Technique, Zinc Phosphate Abstract Zinc phosphate molecular sieve were synthesized using zinc chloride, phosphoric acid as a zinc and phosphor source, respectively.
Of these, zinc phosphates with open architectures are interesting due to the fact that the total charges associated with them (+2 and +5) are similar to those of the aluminosilicates (+3 and +4), resulting in zinc phosphates with zeolitic structures [3-6].
Zinc phosphates are an important class of materials in many cases, they show structures resembling that of zeolites, exhibiting similar topologies as well as framework charge; they crystallize through synthesis routes requiring basic environments and template molecules [7].
The crystal structures data of β-Hopeite phase that obtained by library of XRD instrument are summarized in Table 1.
Table 1 Crystal data and structure refinement parameters for β-Zn3(PO4)2.4H2O (β-Hopeite) Formula weight (g.mol−1) Space group a (Å) b (Å) c (Å) Cell Volume (Å3) Dcalc (g.cm−3) 458.14 Pnma (62) 10.611 18.312 5.0309 977.55 3.113 In the other experiment, zinc phosphate molecular sieve was synthesized with tetra methyl ammonium hydroxide, TMAOH, as template for sample ZP5.
Online since: August 2016
Authors: Pavel Rovnaník, Barbora Fialová
This might be attributed to the hydrothermal reaction of unreacted slag particles which caused the structure to be denser.
Fig. 2 Compressive and flexural strengths of AAS exposed to temperatures 200–1200 °C and post-treated at different humidity conditions Pore structure.
Fracture surface of sample which was heated to 600 °C shows a typical structure of AAS binder which is mainly composed of calcium aluminosilicate gel with lots of microcracks formed due to internal drying shrinkage, the number of which increases during heating.
The major phase change appeared at 800°C, when the matrix shrank to form very porous sponge-like structure.
Hewlitt: Lea’s Chemistry of Cement and Concrete (4. ed., Butterworth-Heinemann, USA, 2001).
Online since: April 2022
Authors: Tien Chien Jen, Patrick Ehi Imoisili
Zeolites are microporous, crystalline, and hydrous aluminosilicates of alkali and alkaline earth metals with a special 3D structural structure made up of [SiO4] and [AlO4] tetrahedral units linked by mutual oxygen [5, 6].
The crystal structure of powdered samples was investigated using XRD, and morphology by SEM-EDX.
The presence of Ca2+ has been shown to interfere with zeolite crystallisation due to its structure-breaking characteristics, a lower CaO level in the fly ashes indicating a greater chance of zeolite nucleation without significant interference.
Chao, Membranes and films of zeolite and zeolite like Materials, J. of Physics and Chemistry of Solids 62 (2001) 1899-1910
Okoronkwo, Effect of Microwave Radiation on The Macromolecular, Morphological and Crystallographic Structures of Plantain (Musa paradisiaca) Fibre.
Online since: June 2008
Authors: Chaiwat Ruksakulpiwat, Sukanya Nuasaen, Choosak Poonsawat, Paveena Khansawai
Synthesis and Modification of Epoxidized Natural Rubber from Natural Rubber Latex Chaiwat Ruksakulpiwat *, Sukanya Nuasaen, Choosak Poonsawat, Paveena Khansawai Department of Chemistry, Faculty of Science, Khon Kaen University Khon Kaen, Thailand email: charuk@kku.ac.th Keywords: natural rubber latex, modification, epoxidation Abstract.
This may be due to the structure of surfactants.
Both surfactants have large structures consisting of ethoxylate unit, sorbitan unit and fatty acid unit while Terric 16A-16 and POE (12) tridecyl ether are alcohol ethoxylate consisting of ethoxylate unit 16 and 12 mole, respectively [5].
They have a smaller structure when compared to those of Tween 80 and Tween 40.
Because of a smaller structure, both surfactants can be adsorbed to NR molecule better than Tween 80 and Tween 40.
Online since: March 2009
Authors: Joerg Pezoldt
These elemental pure carbon polymers are the basic building blocks of more complex allotropic structures like carbon nanotubes, different types of fullerenes, C8 etc..
The resulting structures were investigated by ex situ reflection high energy electron diffraction (RHEED).
The measured values of the d200 demonstrate the formation of a more dense graphite structure for longer annealing times and higher annealing temperatures.
The formation of carbon related structures appeared on the carbon face at lower temperatures compared to the silicon phase (Fig. 4).
Shpak: In: Hydrogen Materials Science and Chemistry of Carbon anomaterials, T.
Online since: February 2011
Authors: Ting Ting Tang, Hong Qiang Qu, Jian Zhong Xu
One-Step Wet Synthesis and Characterization of Hydrophobic Magnesium Hydroxide Jianzhong Xua, Tingting Tangb and Hongqiang Quc College of Chemistry and Environmental Science, Hebei University, Baoding, 071002, China axujz@hbu.edu.cn, btangtingting_hbl@163.com, chqqu@163.com Keywords: Magnesium Hydroxide; Oleic Acid; Hydrophobic Property; Flame Retardancy.
Morphology and structure of the samples were observed by scanning electron microscopy (SEM) with a filed-emission-scanning electron microscope (JSM7500F).
Structure and morphology of Mg(OH)2 nanoparticles.
The hydrophobic Mg(OH)2 nanoparticles shows a lamella structure and staggered pattern.
The hydrophobic Mg(OH)2 nanoparticles shows a lamella structure and staggered pattern and the water contact angle is 106°.
Online since: April 2009
Authors: Shuchi Dixit, P. Jeevanandam
Jeevanandam*b Department of Chemistry Indian Institute of Technology Roorkee Roorkee-247667, India a e-mail: dixitshuchi@gmail.com, be-mail: jeevafcy@iitr.ernet.in; * Corresponding Author Keywords: Iron oxide nanoparticles, Thermal decomposition, Size and shape control Abstract An easy onepot reaction for the synthesis of iron oxide nanoparticles is reported.
In the case of sample D, prepared with a higher concentration of oleyl amine, rod-like structures (length: 0.5 m to a few microns; diameter: 50150 nm) can be seen.
The formation of large rod-like structures at higher concentration of oleyl amine (Figure 5b) can be explained as follows.
Higher concentration of oleyl amine leads to rod-like structures, while lower concentration leads to the formation of small spherical nanoparticles (size ≤ 5 nm).
Schwertmann: Iron Oxides: Structure, Properties, Reactions, Occurrence (Wiley-VCH Verlag, Weinheim, 2003). 13.