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Kareiva Department of Inorganic Chemistry, Vilnius University, Naugarduko str. 24, Vilnius, LT-03225, Lithuania *aleksandra.prichodko@chf.vu.lt Keywords: calcium hydroxyapatite, sol-gel chemistry, thin films, stainless steel, spin-coating, dip-coating.
In this study, an aqueous sol-gel chemistry route has been developed to prepare nanostructured CHAp thin films on stainless steel substrate.
CHAp is suitable for bone substitution due to a similar chemical composition and the crystal structure as natural hard tissue [1, 2].
Intensive absorption lines located at ~600 cm-1 unambiguously could be attributed to Ca-O vibrations in apatite structure.

W.Scherer, Sol-gel science: the physics and chemistry of sol-gel processing.
Barrer, Hydrothermal chemistry of zeolites.
Special issue “Chemistry, chemical technology and environment”.
[21] ILER, Ralph K., The chemistry of silica.
Prikladnoj khimii (Applied Chemistry), 3 (1986) 592-595

The first RF organic aerogel was synthesized by Pekala through the aqueous polycondensation of resorcinol with formaldehyde using sodium carbonate as the base catalyst, where its associated chemistry is similar to the sol-gel chemistry in inorganic materials.
CRF had nanoparticle (100-200nm) morphology and three-dimensional nanonetwork structure.
It indicated that pyrolysis could maintain the overall skeleton to organic aerogels, and increase the number of pore structures.
When the R/C molar ratio was 1500, as the increase of M value, the CRF network structure became more compact and the density increased.
The pore structure and specific surface area can be controlled by R/C ratio and M value.

In the present study, CaP was synthesized by the wet chemistry method, in which starting reagent grades calcium nitrate and diammonium phosphate were used as the molar ratio Ca/P=1.5.
There was a slight effect on the crystal structure of CaP by adding SMB.
It aimed to investigate the effect on the medicine content and the crystal structure of the CaP by using the various adding methods.
In addition, there was a slight effect on crystal structure by adding SMB.
TenHuisen: Journal of Solid Chemistry, vol.177(2004) 793-799

Duodu: Food Chemistry: Vol. 85, pp. 81-89, (2004)
Li: Food Chemistry: Vol. 103, pp. 906-912, (2007)
Li: Food Chemistry: Vol. 115, pp. 826-831, (2009)
Gao: Food Chemistry: Vol. 84, pp. 65-69, (2004)
Food Chemistry: Vol. 51, pp. 8088-8092, (2003)

The obtained BZY20 powder samples have been fully characterized for its structure, morphology, and thermal properties.
It can be synthesized via wet chemistry routes or by employing a typical solid state reaction.
As evident from the XRD and Raman analyses, a cubic perovskite structured sample was achieved by sintering at a lower temperature of 1000°C for 48 hours.
Yamaguchi: Chemistry of Materials Journal, ACS Publications, Vol. 25, Issue 9 (2013), pp. 1483-1489
Irvine: Journal of Materials Chemistry 18(29) (2008), pp. 3414-3418.

Nanocrystalline Ag doped silica inverse opals were prepared by a sol-gel chemistry method via templating of polystyrene colloidal crystals.
In this work, Ag doped silica inverse opal structures were prepared by sol-gel chemistry method by the colloidal crystal template method.
Characterization of the inverse opal structure films.
An FCC close-packing structure with (111) planes along the substrate is shown.
Fluorescence spectrum of the Ag doped silica inverse opal structure.

Sirotkin, Chemistry (Basic chemistry of the single): textbook, KNORUS, Moscow, 2017
Obolonskaya, Structure, mechanical stability and chemical bond in alkali metal oxides, J. of structural chemistry. 6 (2010) 1043-1051
Ivanovsky, Modeling of the electronic structure, chemical bond, and properties of triple silikocarbide Ti3SiC2, Journal of structural chemistry. 4 (2011) 806-822
Ivanovsky, Compounds of thorium with nonmetals: electronic structure, chemical bond, physical and chemical properties, J. of structural chemistry. 2 (2008) 348-370
Sirotkin, Metallicity of Chemical Bonds and Its Role in Their Systematization and Effect on the Structure and Properties of Substances, Russian J. of Physical Chemistry A. 6 (2020) 1153–1158

The review of the application of Graphene/Chitosan Composite Jing ZHAO1, a, Hong ZHANG2, b 1College of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai, 201620, China 2College of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai, 201620, China aemail: smxzjhyn@163.com, bemail:zhanghonglindi@163.com Keywords: Chitosan; Graphene Oxide; Composite; Application ; Review Abstract.
Graphene is not only low prices, but also has a laminated structure and good thermal stability and electrical conductivity.
They studied the morphology and structure of the composite film by FT-IR, UV-vis, TEM and XRD.
AuNPs/Chit-GP show obvious positive charge, so it can immobilize glucose oxidase (GOD) through electrostatic interaction, and structure GOD/AuNPs/Chit-GP/GC modified electrode.
References [1] DR Dreyer, S Park, CW Bielawski and RS Ruoff.The chemistry of graphene oxide[J].

The gradient wetting properties were attributed to the gradient surface chemistry from the ester group to acid salt on copolymer film.
Fig.1 demonstrates the chemical structure of P (MMA-BA) [8].
Fig. 2 described the chemical structure of amino curing agent (product name is CYMEL 303).
Fig.1 Chemical structure of P (MMA-BA)[8] Fig.2 Chemical structure of CYMEL 303 Fig.3 Contact angle of P (MMA-BA) Fig.4 Contact angle of P (MMA-BA-HEMA) Conclusions P (MMA-BA) and P (MMA-BA-HEMA) can be obtained by the conventional free radical solution polymerization.
McMurry: Fundamentals of organic chemistry (Graphic World Inc, USA 2011)