scholarly journals Effect of Carbonate to Phosphate Molar Ratios on the Physico-Chemical Properties of Carbonated Hydroxyapatite Nanopowder

2020 ◽  
Vol 16 (2) ◽  
pp. 101-110
Author(s):  
Muhammad Syazwan Mohd Noor ◽  
Nur Nabilah Afja Mohd Afandi ◽  
Ahmad-Fauzi Mohd Noor ◽  
Yanny Marliana Baba Ismail
Keyword(s):  
Crystal Structure ◽  
Single Phase ◽  
Chemical Properties ◽  
Degree Of Crystallinity ◽  
Apatite Structure ◽  
Carbonated Hydroxyapatite ◽  
Cell Parameters ◽  
Molar Ratios ◽  
Physico Chemical ◽  
The Degree Of Crystallinity

The aim of this study was to incorporate carbonate ions (CO3 2–) into the hydroxyapatite (HA) crystal structure followed by investigation on the effect of different carbonate to phosphate (CO3 2–/PO4 3–) ratios on the phase purity, crystal structure as well as CO3 2– content present in the apatite structure. CO3 2– substitution has been proposed to enhance the performance of HA-based material, particularly on the physico-chemical properties. Three different compositions of carbonated hydroxyapatite (CHA) powder with different CO3 2–/ PO4 3– ratios (namely, CHA 1:1, CHA 2:1 and CHA 4:1) were chemically synthesised by nanoemulsion method at 37°C and characterised for their physico-chemical properties. Results demonstrated that all as-synthesised powders formed single phase B-type CHA without any additional phases. Interestingly, an increasing amount of CO3 2– substituted into the apatite structure gives rise to the formation of CHA structure with a variation on their cell parameters and the degree of crystallinity. An increase in the CO3 2–/ PO4 3– ratio was also found to lead a higher amount of CO3 2– content present in the as-synthesised powder (in a range of 4 wt % to 10 wt %), which is comparable to the CO3 2– content found in the human bone mineral.

scholarly journals Features of structure and properties of hemp cellulose nitrates

2019 ◽  
pp. 41-44
Author(s):  
A. V. Kostochko ◽  
Z. T. Valishina ◽  
R. Ya. Deberdeev
Keyword(s):  
Chemical Properties ◽  
Gel Permeation Chromatography ◽  
Intramolecular Interactions ◽  
Degree Of Crystallinity ◽  
X Ray Diffraction ◽  
Hemp Fiber ◽  
Physico Chemical ◽  
The Degree Of Crystallinity ◽  
Qualitative Characteristics ◽  
Cellulose Nitrates

Comprehensive studies of the structural, molecular and physico-chemical properties of cellulose nitrates from hemp fiber were carried out using modern research methods: capillary viscometry, IR Fourier spectroscopy, X-ray diffraction, gel permeation chromatography. The results of the study revealed features of the influence of inter- and intramolecular interactions in cellulose macromolecules from various types of fiber, the degree of crystallinity of the initial material, and the degree of polydispersity on the formation of qualitative characteristics of hemp cellulose nitrates.

Albumen-mediated Green Synthesis of ZnFe2O4 Nanoparticles and Their Physico-Chemical Properties

2021 ◽  
Vol 14 (5) ◽  
pp. 445-449
Keyword(s):  
Zinc Ferrite ◽  
Single Phase ◽  
Chemical Properties ◽  
Synthesis Process ◽  
X Ray Diffraction ◽  
Scanning Microscope ◽  
Physico Chemical ◽  
Znfe2o4 Nanoparticles ◽  
Photoluminescence Studies ◽  
Combustion Technique

Abstract: Spinel ferrites with general formula AB2O4 possess charming magnetic and electrical properties owing to their thermal and chemical steadfastness. Spinel zinc ferrite (ZnFe2O4) nanoparticles have attracted massive attention due to their unusual amalgamation of properties, especially magnetic properties, where these properties are equipped as suitable candidates in the field of electronics. Here, a simple self-combustion technique is made with the assistance of albumen to synthesize nanocrystalline zinc ferrite (ZnFe2O4) particles. The egg white (albumen) that is used in the synthesis process plays the fuel role in the process of combustion. The results of the powder X-ray diffraction (PXRD) and Fourier Transform Infrared Spectroscopy (FTIR) suggested that the synthesized nanoparticles are of single phase and show spinel structure. The photoluminescence studies reported a doublet peak at around 360-380 nm. The functional groups present in the synthesized nanoparticles were revealed from FTIR data. EDX findings give an account of the percentage composition of the elements Fe, Zn and O present in the synthesized sample. High-resolution Scanning Microscope (HRSEM) reveals the agglomerated coalescence nature of ferrite nanoparticles. Keywords: Ferrite, PXRD, FTIR, HRSEM, EDX Albumen.

The Synthesis of Indium Tin Oxide Nano – Powders by Solvothermal Process

2005 ◽  
Vol 492-493 ◽  
pp. 331-334
Author(s):  
Jin Seok Lee ◽  
Sung Churl Choi
Keyword(s):  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Single Phase ◽  
Chemical Properties ◽  
Mixed Solution ◽  
Solvothermal Process ◽  
Tin Chloride ◽  
Physico Chemical ◽  
Processing Variables ◽  
Indium Nitrate

Well-crystallized and nano-sized indium tin oxide (ITO) powders were prepared by a solvothermal process from a mixed solution consisting of indium nitrate and tin chloride. The characteristics of the solvothermally synthesized ITO powders were studied to investigate the contribution of the processing variables on the physico-chemical properties of powders. The results of this study show that the nano-sized blue ITO powders with a single phase could be directly obtained by changing the medium from water to organic solvent.

scholarly journals Tailored Biodegradable and Electroactive Poly(Hydroxybutyrate-Co-Hydroxyvalerate) Based Morphologies for Tissue Engineering Applications

2018 ◽  
Vol 19 (8) ◽  
pp. 2149 ◽  
Author(s):  
Luís Amaro ◽  
Daniela Correia ◽  
Teresa Marques-Almeida ◽  
Pedro Martins ◽  
Leyre Pérez ◽  
...  
Keyword(s):  
Tissue Engineering ◽  
Cobalt Ferrite ◽  
Degree Of Crystallinity ◽  
Engineering Applications ◽  
Cell Proliferation And Differentiation ◽  
Cobalt Ferrites ◽  
Physico Chemical ◽  
Proliferation And Differentiation ◽  
The Degree Of Crystallinity ◽  
Composite Samples

Polymer-based piezoelectric biomaterials have already proven their relevance for tissue engineering applications. Furthermore, the morphology of the scaffolds plays also an important role in cell proliferation and differentiation. The present work reports on poly(hydroxybutyrate-co-hydroxyvalerate) (PHBV), a biocompatible, biodegradable, and piezoelectric biopolymer that has been processed in different morphologies, including films, fibers, microspheres, and 3D scaffolds. The corresponding magnetically active PHBV-based composites were also produced. The effect of the morphology on physico-chemical, thermal, magnetic, and mechanical properties of pristine and composite samples was evaluated, as well as their cytotoxicity. It was observed that the morphology does not strongly affect the properties of the pristine samples but the introduction of cobalt ferrites induces changes in the degree of crystallinity that could affect the applicability of prepared biomaterials. Young’s modulus is dependent of the morphology and also increases with the addition of cobalt ferrites. Both pristine and PHBV/cobalt ferrite composite samples are not cytotoxic, indicating their suitability for tissue engineering applications.

Crystal structure of a major seed storage protein, 11S proglobulin, from Amaranthus hypochondriacus: Insight into its physico-chemical properties

2012 ◽  
Vol 135 (2) ◽  
pp. 819-826 ◽  
Author(s):  
Mary Rose Tandang-Silvas ◽  
Cerrone S. Cabanos ◽  
Laura Denisse Carrazco Peña ◽  
Ana Paulina Barba De La Rosa ◽  
Juan Alberto Osuna-Castro ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Storage Protein ◽  
Seed Storage Protein ◽  
Chemical Properties ◽  
Seed Storage ◽  
Amaranthus Hypochondriacus ◽  
Physico Chemical ◽  
Insight Into

The Electrochemical Synthesis of Neutral Zinc(II) Complexes of Schiff Base Ligands: The Crystal Structure of Bis[N-(4-methylphenyl)salicylaldiminato]zinc(II)

1988 ◽  
Vol 43 (5) ◽  
pp. 611-615 ◽  
Author(s):  
T. Sogo ◽  
J. Romero ◽  
A. Sousa ◽  
A. de Blas ◽  
M. L. Durán ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Schiff Base ◽  
Schiff Bases ◽  
Electrochemical Synthesis ◽  
Chemical Properties ◽  
Zinc Atom ◽  
Schiff Base Ligands ◽  
Space Group ◽  
X Ray ◽  
Physico Chemical

Abstract The electrochemical synthesis and physico-chemical properties of neutral zinc(II) complexes of bidentate Schiff bases derived from salicylaldehydes are presented together with the X-ray structure of bis[N-(4-methylphenyl)salicylaldiminato]zinc(II). The crystal is monoclinic, a = 21.877(3), b = 8.801(2), c = 12.027(5) Å, β = 96.55(3)°, space group C2/c. The complex is a monomer, and the zinc atom is tetrahedrally coordinated.

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