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In this study, nanostructured Ce- and Sm-substituted Ca10(PO4)6(OH)2 samples have been synthesized using an aqueous sol-gel chemistry route.
Although these materials can closely replicate the structure of human bone, the specific chemical structural and morphological properties of CHA bioceramics are highly sensitive to the changes in chemical, structural, morphological composition and processing conditions [2, 3, 5-8].
For example, nanocrystalline hydroxyapatite powders were prepared by gelatine-based, solution co-precipitation, wet chemistry precipitation and sol-gel methods.
McConnel, Apatite, Its Crystal Chemistry, Mineralogy, Utilization and Geologic and Biologic Occurrences, Springer, New York, 1973
Barroug, Nanocrystalline apatites in biological systems: characterisation, structure and properties, Materialwissenschaft Werkstofftechnik. 38 (2007) 996–1002

Corrosion Inhibition of Dissymmetric Bis-quaternary ammonium with Imidazoline ring on Q235 steel in 1.0 mol·L -1 Hydrochloric acid solution Bin Jiang a Min Du b* Jing Zhangc Zhao-dong Sun d Key Laboratory of Marine Chemistry Theory and Technology,Ministry of Education, College of Chemistry and Chemical Engineering ,Ocean University of China, Qing Dao 266100,China a jiangbin_ouc@126.com, bsdm06@126.com, cdmh217@ouc.edu.cn, d cheerdong@126.com Key words: Dissymmetric bis-quaternary ammonium; corrosion inhibitor; acid media; Quantum chemistry calculations Abstract: Dissymmetric bis-quaternary ammonium with imidazoline ring was evaluated for corrosion inhibition efficiency against Q235 steel in 1.0mol·L -1hydrochloric acid solution at room temperature (298K) by gravimetric method, potentiodynamic polarization, electrochemical impedance spect- rum(EIS) and quantum chemical calculation.
Quantum chemical analysis Fig 3 Equilibrium structure of DBAI (a,b) Table 4 Parameters of DBAI and molecular structure properties Fig.3 shows a full geometry optimization of the DBAI molecule.
Quantum chemistry calculation results explain the good inhibition efficiency of DBAI.
Structure parameters DBAI Imidazolium quaternary Totalenergy(eV) -5992.41627 -3105.60078 EHOMO(eV) -13.242 -12.236 ELUMO(eV) -6.459 -3.845 ΔE(eV) 6.738 8.391 Point group Cl Cl

The bromo-product core structure (2) was produced by using PBr3 in 82%.
Fig. 2 Structures of the major components in Rhinacanthus nasutus In 2003, Ngampong Kongkathip and co-worker have reported the successful synthesis and anticancer evaluation of rhinacanthone, 1,2-pyrano and -furanonaphthoquinones, 1,4-pyrano and -furanonaphthoquinones [7].
Sheridan, Bioactive Naphthoquinones from Higher Plants, Studies in Natural Products Chemistry, 41 (2014) 119 – 160
Sheriden, Studies in Natural Products Chemistry, 41 (2014) 119-160
Kongkathip, First synthesis and anticancer activity of novel naphthoquinone amides, European Journal of Medicinal Chemistry. 49 (2012) 253-270

Ferrocene-Based with Thiadiazole Antibacterial Agents: Synthesis, Characterization, and Biological Evaluation Dawei Yin1, 2,Xiaoming Sun1, 2, Yuting Liu1, 2*（Key laboratory of Auxiliary Chemistry & technology for Chemical Industry, Ministry of Education, College of Chemistry & Chemical Engineering, Shaanxi University of Science & Technology, Xi’an 710021, People’s Republic of China） Keyword: ferrocene, schiff base, antibacterial activity, thiadiazole, Gram-negative Gram-positive Abstract: A series of ferrocene schiff bases derived from Thiadiazole have been synthesized and characterized by IR, 1H NMR, and elemental analysis, the results conformed well with expected structures.
Introduction Since its discovery fifty years ago, the chemistry of ferrocene has developed dramatically1.
Bioinorganic Chemistry and Applications.12:1 CrossRef ISI
Org Chemistry, 545:381 CrossRef ISI
[9] Sinn E, Harris CM. 1996.Coordination Chemistry Reviews . 4: 391 CrossRef ISI

Generalized Version of ISI Invariant for Some Molecular Structures K.
In the study of nanotechnology and mathematical chemistry, analyse the properties of fullerenes, nanotubes, nanocones, nanostars etc. are hot topics.
Gao et al. [9] found irregularity measures of some dendrimer structures and they studied molecular structures in[10].
Fig 2 represents the structure of D[p] nanostar dendrimer.
A [27]-arborol,” e Journal of Organic Chemistry, vol. 50, no. 11, pp. 2003-2004, 1985

Heating of graphite bisulfate at 500-1000○С leads to deintercalation of embedded particles and restoration of the initial graphite structure.
The use of the developed protection coat allows to increase the fatigue strength of welded metal structures by 35-40%.
American Journal of Analytical Chemistry, 9(07), 331. https://doi.org/10.4236/ajac.2018.97026 [8] McAllister, M.J., Li, J.L., Adamson, D.H., Schniepp, H.C., Abdala, A.A., Liu, J., & Aksay, I.A. (2007).
Chemistry of materials, 19(18), 4396-4404. https://doi.org/10.1021/cm0630800 [9] Yang, S., Wang, Q., & Wen, B. (2020).
Chemistry of Materials, 29(2), 564-572. https://doi.org/10.1021/acs.chemmater.6b03748 [11] Kellett, E.A., & Richards, B.P. (1964).

Surface chemistry of the samples before and after poling treatment was studied by X-ray photoelectron spectroscopy (XPS).
Surface Chemistry Characterization.
On the other hand, some biological materials, such as collagen, gelatin, polysaccharides, DNA, enzymes, etc, naturally possess the polar alignments of dipoles in their structures and manifest piezoelectric effects throughout the life activities.
It is inferred that no surface chemistry changes occurred on the PLLA surfaces after poling treatment.
However, its inherently inert chemistry and poor interaction with living tissues make it less bioactive.

Ideal tensile strength of Ni3Al and Fe3Al with D03 structure Dominik Legut1,2 a, Mojmír Šob 1,3,b 1 Institute of Physics of Materials, Academy of Sciences of the Czech Republic, v.v.i., Žižkova 22, CZ-616 62 Brno, Czech Republic 2 Faculty of Chemistry, Brno University of Technology, Purkyňova 118, CZ-612 00 Brno, Czech Republic 3 Department of Chemistry, Faculty of Science, Masaryk University, Kotlářská 2, 611 37, Masaryk University, Czech Republic a legut@ipm.cz, bsob@chemi.muni.cz Keywords: ideal tensile strength, intermetallics, D03 structure, displacive phase transformations, magnetism Abstract.
Theoretical tensile test simulation in the [111] direction in the D03 structure.
For Ni3Al in D03 structure, no experimental data exist.
Surprisingly, the Ni3Al compound in its metastable D03 structure is non-magnetic.
It might be connected with a lower value of the bulk modulus of Fe3Al with respect to Ni3Al which indicates that Fe3Al in the D03 structure is somewhat "softer" than Ni3Al in the same structure.

PARTICULARITIES OF STRUCTURE AND STABILITY OF CATIONIC-ORDERED LAYERED TITANATES Irina Zvereva1,a, Anna Sankovich1,b, Alexander Missyul1,c 1St.
Their structure variations are monitored using thermal analysis (TGA, DTA), X-ray powder diffraction, and scanning electron microscopy.
The comparison of oxides stability is carried out in terms of crystal chemistry.
In the structure of three-layer oxides, three octahedra along c axis are distorted in different degrees.
In terms of crystal chemistry, various thermal behavior results from the distortion degree of TiO6 octahedra, difference in coordination environment of Nd+3 cations and length of M–O bond connecting layers in intergrowth structure.

Journal of Physical Chemistry A 105 (2001) 238-244.
Structure of [Mn(FcCOCHCOCH3)3], Inorganic Chememistry ASAP (2016).
Ziegler, Chemistry with ADF, Journal of Computational Chemistry 22 (2001) 931-967.
Pombeiro, Structure, Electrochemistry and Hydroformylation Catalytic Activity of the Bis(pyrazolylborato) rhodium(I) Complexes [RhBp(CO)P] [P=P(NC4H4)3, PPh3, PCy3, P(C6H4OMe-4)3], European Journal of Inorganic Chemistry 2004 (2004) 1411–1419.
Conradie, Thienyl-containing b-diketones: synthesis, characterization, crystal structure, keto-enol kinetics, South African Journal of Chemistry 61 (2008) 13-21