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Online since: April 2013
Authors: Kazutoshi Haraguchi
Extraordinary Properties and New Functions of Nanocomposite Gels and Soft Nanocomposites with Unique Organic/Inorganic Network Structures Kazutoshi Haraguchi1, a 1Material Chemistry Laboratory, Kawamura Institute of Chemical Research, 631 Sakado, Sakura, Chiba 285-0078, Japan ahara@kicr.or.jp Keywords: Nanocomposite, Clay, Hydrogel, Network, Mechanical property, Cell culture.
New types of polymer hydrogels and nanocomposites, i.e., nanocomposite gels (NC gels) and soft, polymer nanocomposites (M-NCs), with novel organic/inorganic network structures have been fabricated.
Introduction Organic/inorganic nanocomposites (NCs) are functional materials consisting of immiscible organic and inorganic components, and complex nanometer-scale structures can be fabricated therefrom.
Figure 2 (a) Polymer/clay network structure, (b) Schematic representation of the process of separation of PNIPA from NC gels through the decomposition of the clay.
The clay network structure proposed is depicted graphically in Figure 4b.
Online since: February 2007
Authors: Xin Huang, Wei Qi Yan, Di Sheng Yang, Hidero Unuma, Zhi Jun Pan
Biological Efficacy of Modified Structure of Polymer Surfaces for Bone Substitute Zhijun Pan1,a , Xin Huang1,a , Disheng Yang1,a , Hidero Unuma2,b, Weiqi Yan 1,c 1 Dept. of Orthopaedic Surgery, The Second Affiliated Hospital, Zhejiang University, China 2 Dept. of Chemistry and Chemical Engineering, Yamagata University, Yamagata, Japan a zrgk1@zju.edu.cn, bunuma@yz.yamagata-u.ac.jp, cwyan@zju.edu.cn Keywords: Hydroxyapatite, Surface modification, Osteoblast response, Gene expression Abstract.
Introduction Polymer composites reinforced by bioactive ceramics, like hydroxyapatite, have been proposed as an alternative of bioactive materials for bone repair or scaffold for tissue engineering.[1] It was demonstrated that deposition of inorganic films, like bone-like apatite, on polymer substrates is a crucial step in the development of bioactive implants.[2] Although many chemical and physical methods have been used to modify the structure of polymer surfaces by depositing thin inorganic composite, most of these techniques are based upon the use of high energy sources that ultimately can damage the polymer surfaces.
Online since: August 2024
Authors: Abolghassem Zabihollah, Stephen Bardowell, Rajesh Vuddandam, Bryan Does
[6] studied the application of additive manufacturing for PLA structures.
They determined the optimal process parameters to achieve the desired mechanical properties of PLA structures.
Most of the existing works on the mechanical properties of PLA structures are limited to tensile strength [14, 15].
Acknowledgements The authors wish to acknowledge the support provided by the Departments of Mechanical, Environmental, and Civil Engineering; and Chemistry, Geoscience, and Physics at Tarleton State University.
First International conference on Advanced Lightweight Materials and Structures
Online since: February 2019
Authors: Mikhail N. Palatnikov, O. Pikoul, Nikolay V. Sidorov
Physical characteristics, peculiarities of the structure and state of crystal defects in LiNbO3 can significantly change the change in composition - change in the relations Li/Nb or alloying [1-7].
At the same time, the strongest decrease in the effect of photorefraction is observed when the concentration of "non-photorefractive" cations exceeds "threshold" values ​​in the crystal, under which the structure of the melt and the mechanism of occurrence of alloying cations in the crystal structure change radically [2,3].
The absence of melt overheating before single crystal growth inevitably leads to the presence of undesirable microinclusions in the structure of the lithium niobate crystal.
In addition, the ring form of isochrom, especially of high orders, undergoes local breaks and discontinuities in the presence of structure defects and optical anomalies [21].
Rauber, Chemistry and physics of lithium niobate, Current topic in materials science, ed.
Online since: January 2013
Authors: Ping Ning, Guang Fei Qu, Jun Jie Gu, Hai Yan Zhao, Jun Yan Li
Olivine structure LiFePO4 attracted much attention as the positive material of Lithium-iron rechargeable batteries, which has the properties, such as good electrochemistry performance, stable charge-discharge, steady structure, non-poisonous, non-pollution, suitable hot environment, relative inexpensive, small volume, light scale, and so on.
To sum up, the main preparation methods can be divided into: ① solid-state chemistry (including solid-state reaction and carbothermal reduction); and ② solution chemistry [9].
All diffraction peak of the three samples were basic consistent with LiFePO4 standard spectrogram, so the three samples were the olivine structure of lithium iron phosphate.
Moreover, mixing carbon way have influence to the sample’s structure and electricity performance.
Nanjundaswamy, Effect of structure on the Fe3+/Fe2+ redox couple in iron phosphates, J.
Online since: November 2010
Authors: Wei Hang Zhang, Hai Yan Du, Jia Yue Sun
In the present work, the structure and upconversion luminescence properties of Yb3+/Er3+ co-doped BaYF5 samples prepared by the chemical co-precipitation method have been studied.
igure 1 depicts the synthesis and molecular structure of the UV-curable sealant.
The both ends of the molecular structure of the synthesized UV-curable sealant include two C=C bonds which belong to π-electronic structure.
Jónsson, in: Theoretical Methods in Condencsed Phase Chemistry, edited by S.D.
Schwartz, volume 5 of Progress in Theoretical Chemistry and Physics, chapter, 10, Kluwer Academic Publishers (2000)
Online since: June 2012
Authors: Xiao Yan Lin, Xue Gang Luo, Cheng Chen, Xiao Li Xiong
The FTIR spectra illustrates that the structure of PE is not destroyed during the extraction.
But the widespread use of non-degradable polyethylene film may bring a series of problems, such as damaging the ability to hold rain agro-ecosystems, changing the structure of soil and affecting the growth of the root [2].
Characterization of the PE structure.
Therefore, an obvious conclusion can be made that the structure of PE is not destroyed in the extraction.
The structure of PE is not destroyed during the extraction.
Online since: October 2010
Authors: Xue Jun Zhang, Su Mei Kang, Zhan Qing Liu
A new kind of latent curing agent (LCA) for epoxy resin was synthesized by the reaction of Ethylenediamine with Butylacrylate in equal molar ratios, and the chemical structure and thermal property of the LCA were studied with FTIR and TGA, respectively.
The LCA releases ethylenediamine and butyl acrylate, and ethylenediamine can react with functional groups of epoxy resin under the suitable temperature; meanwhile, linear butyl acrylate can cross-link into a network structure and cross with epoxy resin through IPN which can improve the mechanical properties of epoxy.
A Fourier transform infrared (FTIR) measurement was carried out on a Nicolet 8700 FTIR spectrometer to characterize the chemical structure of the synthesized LCA.
Results and discussion Chemistry structure.
All these characteristic peaks reveal synthesis of LCA is carried out as expect, resulting in sample with the desired chemical structure.
Online since: July 2017
Authors: Rene Alejandro Castro, Aleksei A. Kononov
This anomaly is caused by relaxation processes in the polymer structure.
Materials with disordered structure, such as thin-film transistors, organic photocells and light-emitting diodes [2], are increasingly used for creating electronic devices.
F. van Hutter, Semiconducting Polymers: Chemistry, Physics and Engineering, Wiley-VCH, Weinheim, 2000, pp. 631
Salaneck, The chemical and electronic structure of the conjugated polymer poly(3. 3-phthalidyliden-4. 4-bihenylilene), Synth.
Castro, Features of the charge transfer in structures based on thin layers of bismuth-modified arsenic triselenide, Semiconduct. 44(8) (2010) 1004-1007.
Online since: May 2011
Authors: Li Ying Guo
Cellulose, hemi-cellulose and lignin are the main components of wood powder which build a 3-dimensional network structure[7].
The chemical structure of the ionic liquid was shown in Scheme 1.
Scheme 1 Chemical structures and abbreviation of [HeVIM]Cl Structure characterization of [HeVIM]Cl.
Results and discussion Chemical structures of fir powder pretreated with different methods.
Journal of Materials Chemistry Vol. 16 (2006), p.4281 [7] H.