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Online since: December 2012
Authors: Bao Ji Wang, San Huang Ke
Time-dependent density functional theory studies of plasmons in parallel double sodium atomic chains Bao-Ji Wang 1,2, San-Huang Ke1,* 1Key Laboratory of Advanced Microstructured Materials, MOE, Department of Physics, Tongji University, Shanghai 200092, China 2College of Physics and Chemistry, Henan Polytechnic University, Jiaozuo 454000, China *shke@tongji.edu.cn Keywords: Plasmon excitation, TDDFT, plasmonic coupling, atomic chains Abstract.
For the well coupled double chains, the excitations show a single longitudinal mode but twin bimodal structure for the transverse modes.
However, as d is further decreased to 2b and 1b, the situation becomes complicated: Some extra transverse resonances emerge and finally form a clear twin bimodal structure while a single L mode still remains, indicating that the strong coupling between the two chains can not be ignored and change significantly the collective response of the single atomic chains.
On the other hand, the excitation energies of the T modes blueshifts slightly and then become saturated because of the 1-dimensional atomic structure.
Online since: April 2012
Authors: Xiao Liang Yan, Qiang Cao, Sheng Hua Lv
Synthesis and Properties of Green Copolymer Retannage of Starch and Acrylamide with HRP/H2O2/ACAC Shenghua Lv 1,a, Xiaoliang Yan1,b and Qiang Cao2,c 1 College of Resource and Environment, Shaanxi University of Science & Technology, Xi’an, 710021, Shaanxi, China 2 College of Chemistry and Life Science, Weinan Normal University, Weinan 714099, China alvsh@sust.edu.cn (corresponding author),b sxyxlbbc@163.com, clab_cao@tom.com Keywords: horseradish peroxidase; graft copolymerization; modified starch retannage Abstract.
The structure of the copolymer was confirmed by FTIR and NMR.
The structures of copolymer were characterized by FTIR and NMR.
The hints the starch’s intrinsic ring structure has not been destroyed during degradation processing.
Online since: April 2013
Authors: Yurii Prots, Natalia Ohon, Marcus Schmidt, Caroline Curfs, Leonid Vasylechko
The crystal structure can be highly affected by iso/aliovalent substitutions in cation sites or by varying temperature and/or pressure.
Results The analysis of X-ray diffraction data collected at RT showed a rhombohedral Rc structure for Nd1–xEuxAlO3 specimens with x < 0.15 and orthorhombic Pbnm structure for the samples with x ³ 0.25.
Accordingly, the refinement of Nd1xEuxAlO3 structures was performed in space groups Rc (x = 0.1) and Pbnm (x ³ 0.25).
Wölfel, Use of the CSD Program Package for Structure Determination from Powder Data, Mater.
Bismayer, Perovskite-Type Aluminates and Gallates, in Handbook on the Physics and Chemistry of Rare Earths, K.A.
Online since: March 2013
Authors: Danuta Kotnarowska
In the final period of ageing craters and superficial cracks appeared in the coating structure.
These etches can develop in the coating structure and, in final phase, reach even the substrate which leads to the loss of coating protective properties [16].
Aggressive media cause also cracking and swelling of coatings as well as pore origination in their structure [5, 7, 15, 18-20], which leads to the increase of coating protective effectiveness.
Chemistry, Moscow 1987 (in Russian)
Online since: August 2015
Authors: Claudia Cobzaru, Genoveva Bordeianu, Adriana Marinoiu, Gabriela Antoaneta Apostolescu, Cristina Cobzaru, Doina Ungureanu, Corina Cernatescu, Nicolae Apostolescu, Ramona Elena Tataru-Farmus
It were studied parameters like free fatty acids (FFA), anisidine value (AV), iodine value (IV), saponification number (SN) and identification of the molecular structure through FT-IR method.
In this sense, we monitored the two types of vegetable oils during 48 months to reveal the changes in their composition in terms of acidity (determination of free fatty acids), lipid oxidation (determination of anisidine value), oxidative rancidity (determination of iodine value and saponification number) and identification of the molecular structure (using FT-IR method).
As can be seen in Fig. 5 (a, b) the FT-IR spectra are not similar they show differences both in exact absorbance values in presence and absence of some functional groups in their structure and different oxidative behavior.
[16] IUPAC, Standard Methods for the Analysis of Oils, Fats and Derivatives, International Union of Pure and Applied Chemistry Blackwell Scientific Publications.7th ed., Oxford, UK, 1987
Online since: September 2005
Authors: N. Ignjatović, Dragan P. Uskokovic, Zoran Nedić, M. Mitrić, Dejan Miličević, M. Radić
Uskoković1,f 1 Institute of Technical Sciences of the Serbian Academy of Sciences and Arts, Belgrade; Serbia and Montenegro 2 Faculty of Physical Chemistry, Belgrade; Serbia and Montenegro 3 The Vinča Institute of Nuclear Sciences, Laboratory for Theoretical and Condensed Matter Physics, Belgrade; Serbia and Montenegro 4 The Vinča Institute of Nuclear Sciences, Laboratory for Radiochemistry and Physics, Belgrade; Serbia and Montenegro a magdalena@itn.sanu.ac.yu, badvamat@itn.sanu.ac.yu, czoran@ffh.bg.ac.yu, d mmitric@vin.bg.ac.yu, edejanmilicevic@vin.bg.ac.yu, fuskok@itn.sanu.ac.yu Keywords: Biphasic Calcium Phosphate, Composite BCP/DLPLG, Differential Scanning Calorimetry, Infrared Spectroscopy, Poly-(DL-Lactide-co-Glycolide), Scanning Electron Microscopy, X-ray Diffraction.
Besides, we have investigated the influence of new synthesis method on the structure and characteristics of the composite.
Introduction Natural bone has a complex structure with macro and micro pores and can be considered as a composite based on ceramic and polymer phases.
Crystal structure refinement was based on the Rietveld full profile method [18] using Koalariet computing program.
Online since: March 2007
Authors: H. Ruckdäschel, J.K.W. Sandler, V. Altstädt
Such composites exhibit many levels of hierarchical structures from macroscopic to microscopic length scales.
Despite these complicated structures, the smallest building blocks in such materials are generally on the nanometre scale and, more importantly, it is a nanoscale reinforcement embedded in a relatively soft matrix.
Within this interphase, the local chemistry, degree of cure, chain mobility, chain conformation, crystal structure, and degree of crystallinity can all vary continuously from the filler surface to some point in the polymer bulk.
The aim is not only to produce novel materials with enhanced properties but also to establish the structure-property relationships of these materials for applications ranging from the electronic to the automotive and aerospace sector.
Ajayan, P.M.; Redlich, P., Structure of carbon nanotube-based nanocomposites, J.
Online since: March 2013
Authors: Raveendran Lavanya, Veerapandy Vasu, Gandhimathinathan Saroja
The XRD analysis revealed the peak has (200) orientation and corresponds to hexagonal primitive structure of WO3.
The physical properties of a material are greatly affected by its structure and morphology as already known.
The WO3 crystal lattice has the structural configuration of distorted ReO3 structure [14].
Gerand et al. [15] also reported the hexagonal structure of WO3 thin films.
Cox, The Electronic Structure and Chemistry of Solids, Oxford University Press, Oxford, 1987
Online since: March 2010
Authors: Hai Tao Liu, Xin Yu Yang, Wei Dong Xiang, Xi Yan Zhang
Introduction Biomolecules, as life's basic building blocks, have special structures and fascinating self-assembling functions.
Their special properties make them templates of unmatched type for the design and synthesis of complicated structures at molecular level.
In preceding work, biomolecules only functioned as structure-directing reagents rather than as a sulfur source.
The as-obtained product is characterized further by TEM, HRTEM and SAED to obtain more information on the structure and morphology.
It can be also explained on the basis of a typical Sb2S3 crystal structure [9].
Online since: March 2014
Authors: Adekunle Oloyede, Cheng Yan, Zheng Bo Lai
(a) OPN peptide structure after 5-ns MD simulation.
Figure 2 illustrates the OPN peptide structure during pulling simulation in positive z-direction.
OPN peptide structure during pulling simulation.
Fedarko, Flexible structures of SIBLING proteins, bone sialoprotein, and osteopontin, Biochem.
Dowker, Rietveld refinement of the crystallographic structure of human dental enamel apatites, Am.