Synthesis methods for nanosized hydroxyapatite with diverse structures.

The present overview is intended to point the readers’ attention to the important subject of calcium orthophosphates. These materials are of the special significance because they represent the inorganic part of major normal (bones, teeth and dear antlers) and pathological ( i.e. those appearing due to various diseases) calcified tissues of mammals. Due to a great chemical similarity with the biological calcified tissues, many calcium orthophosphates possess remarkable biocompatibility and bioactivity. Materials scientists use this property extensively to construct artificial bone grafts that are either entirely made of or only surface-coated with the biologically relevant calcium ortho-phosphates. For example, self-setting hydraulic cements made of calcium orthophosphates are helpful in bone repair, while titanium substitutes covered by a surface layer of calcium orthophosphates are used for hip joint endoprostheses and as tooth substitutes. Porous scaffolds made of calcium orthophosphates are very promising tools for tissue engineering applications. In addition, technical grade calcium orthophosphates are very popular mineral fertilizers. Thus ere calcium orthophosphates are of great significance for humankind and, in this paper, an overview on the current knowledge on this subject is provided.

https://www.mdpi.com/1996-1944/2/2/399/pdf

Calcium Orthophosphates in Nature, Biology and Medicine

The control of luminous radiation has extremely important implications for modern and future technologies as well as in medicine. In this Review, we detail chemical structures and their relevant photophysical features for various groups of materials, including organic dyes such as metalloporphyrins and metallophthalocyanines (and derivatives), other common organic materials, mixed metal complexes and clusters, fullerenes, dendrimeric nanocomposites, polymeric materials (organic and/or inorganic), inorganic semiconductors, and other nanoscopic materials, utilized or potentially useful for the realization of devices able to filter in a smart way an external radiation. The concept of smart is referred to the characteristic of those materials that are capable to filter the radiation in a dynamic way without the need of an ancillary system for the activation of the required transmission change. In particular, this Review gives emphasis to the nonlinear optical properties of photoactive materials for the functi...

Nonlinear Optical Materials for the Smart Filtering of Optical Radiation.

Study of corrosion in biocompatible metals for implants: A review

Advances in synthesis of calcium phosphate crystals with controlled size and shape.

New stilbazolium derivatives chromophores with donor-π-acceptor structure: 2-[2-(4-Diethylamino-phenyl)-vinyl]-1-methyl-pyridinium naphthalene-2-sulfonate (DESNS) have been synthesized via Knoevenagel condensations reaction. Luminescence property of the grown crystal indicates that the DESNS is an excellent orange and red light emitting material. The chemical etching studies made on the surface of DESNS and to assess the perfection of the grown crystals, which reveals that formation of layer growth pattern. Both the values of dielectric constant and dielectric loss of the crystal were calculated by varying the frequencies at ambient temperature. The effective third-order nonlinear optical susceptibility χ(3) of the grown crystal have been investigated by Z-scan technique using He-Ne laser at 632.8nm, which is found to be χ(3) = 3.509× 10−4esu. The negative sign of the nonlinear refractive index n2 = 5.1242×10−12 m2/W indicates that title material exhibits self-defocusing optical nonlinearity.

Investigation on third-order optical nonlinearities of newly synthesized stilbazolium derivative crystal by Z-scan technique

Calcium manganites (CaMnO3) ceramic powders were prepared by sol–gel technique using citric acid as a chelating agent. The polycrystalline powder crystallized in an orthorhombic structure with lattice parameters a = 5.270 A, b = 7.421 A and c = 5.231 A. Dielectric relaxation was observed which can be attributed to Maxwell–Wagner relaxation behavior. The oxidation states of Calcium, Manganese and the presence of oxygen deficiencies in the prepared samples were ascertained by XPS studies.

Dielectric relaxation in CaMnO3 ceramics synthesized by sol–gel method

Investigation of magnetic, optical and electrical properties of La3Ba3Cu6O14 synthesized by molten flux method

Investigations and Correlations of Structural, Magnetic, and Dielectric Properties of M-Type Barium Hexaferrite (BaFe12O19) for Hard Magnet Applications

A. Ruban Kumar

Papers

Investigation on third-order optical nonlinearities of newly synthesized stilbazolium derivative crystal by Z-scan technique

Dielectric relaxation in CaMnO3 ceramics synthesized by sol–gel method

Investigation of magnetic, optical and electrical properties of La3Ba3Cu6O14 synthesized by molten flux method

Investigations and Correlations of Structural, Magnetic, and Dielectric Properties of M-Type Barium Hexaferrite (BaFe12O19) for Hard Magnet Applications

Preparation And Characterisation Of Gelatin Blend Pectin Encapsulated Hydroxyapatite (Ca10(OH)2(PO4)6) Nanoparticles Using Precipitation Method