I.R. spectra of the phosphate ions in various apatites

Klee, W. E.; Engel, G.

doi:10.1016/0022-1902(70)80590-5

Cited by 133 publications

(52 citation statements)

References 13 publications

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“…, seguir padrão correto (respeitando estilo de escala, posição dos dados, caixa inferior da imagem, fundo preto). and between 3000 and 3600 cm -1 , respectively with are in good agreement with other studies [22][23][24][25][26] . The related results indicate the apatite formation on silicon nitride surfaces after treatment with the biomimetic method.…”

Section: Resultssupporting

confidence: 80%

Hydroxyapatite coating on silicon nitride surfaces using the biomimetic method

Silva¹,

Rigo

Marchi

et al. 2008

Mat. Res.

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Silicon nitride based ceramics are promising candidates for biomedical applications due to their chemical and dimensional stability associated to suitable mechanical strength and relatively high fracture toughness. However, the bioinert characteristics of these ceramics limit their application to situations where the formation of chemical bonds between the material and the tissue are not essential. A way to broaden the application field of these ceramics in medicine is promoting their bioactivity by means of a hydroxyapatite coating. Therefore, in this paper, samples of silicon nitride were coated with apatite using the biomimetic method. The treated silicon nitride surface was characterized by diffuse reflectance infrared Fourier transformed, X ray diffraction and scanning electron microscopy. The results showed that a layer of hydroxyapatite could be deposited by this method on silicon nitride samples surface.

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Section: Resultssupporting

confidence: 80%

Hydroxyapatite coating on silicon nitride surfaces using the biomimetic method

Silva¹,

Rigo

Marchi

et al. 2008

Mat. Res.

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“…In addition, we notice the existence of weak bands at about 120 and 26 cm −1 that can be attributed to the vibration of the K + or Ca 2+ cations. The enlargement of bands and the appearance of a shoulder in ClApK2 spectrum, at about 962 cm −1 is probably due to a variation of the P-O bond length [17] and consequently to a deformation of the PO 4 tetrahedron when the potassium content increases, provides evidence that the potassium insertion (element more voluminous than calcium) results in the creation of a structural disorder.…”

Section: Resultsmentioning

confidence: 95%

Synthesis of potassium chloroapatites, IR, X‐ray and Raman studies

Feki

Amami

Salah

et al. 2004

phys. stat. sol. (c)

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New conditions of synthesis Ca-chlorapatite and K-Ca-chlorapatite by using the melt salts method were determined. The results of X-ray diffraction show that the compound Ca-chlorapatite crystallizes in the hexagonal system (space group P63/m) with the crystallo-graphic parameters (a = b = 9.6228(3)Å and c = 6.7610(3)Å) that are closely equal to those of literature. Two potassium calcium chlorapatites were prepared by this method. Samples were identified by X.R diffraction, IR spectroscopy, chemical analysis and density measurements. Results allow to propose a global general formula (Ca 10−xKx(PO4)6(Cl)2−x with 0 < x < 2 ). IR absorption and Raman diffusion studies allow to attribute different modes of vibration and to show the structural disorder.

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“…There was an intensity variation at 3600-3100 cm À1 region (OÀ ÀH stretching band), and 1250-850 cm À1 region (CÀ ÀO and CÀ ÀOÀ ÀC stretching frequency) with increased soaking time in terms of cellulose absorption spectra. 29 On the other hand, the characteristic phosphate absorption bands of Ca-P phase [30][31][32] groups. 22 The stoichiometric hydroxyapatite, however, usually displays this characteristic peak at $1030 cm À1 .…”

mentioning

confidence: 98%

Surface functional group dependent apatite formation on bacterial cellulose microfibrils network in a simulated body fluid

Nge

Sugiyama

2006

J Biomedical Materials Res

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The apatite forming ability of biopolymer bacterial cellulose (BC) has been investigated by soaking different BC specimens in a simulated body fluid (1.5 SBF) under physiological conditions, at 37 degrees C and pH 7.4, mimicking the natural process of apatite formation. From ATR-FTIR spectra and ICP-AES analysis, the crystalline phase nucleated on the BC microfibrils surface was calcium deficient carbonated apatite through initial formation of octacalcium phosphate (OCP) or OCP like calcium phosphate phase regardless of the substrates. Morphology of the deposits from SEM, FE-SEM, and TEM observations revealed the fine structure of thin film plates uniting together to form apatite globules of various size (from <1 mum to 3 mum) with respect to the substrates. Surface modification by TEMPO (2,2,6,6-tetramethylpyperidine-1-oxyl)-mediated oxidation, which can readily form active carboxyl functional groups upon selective oxidation of primary hydroxyl groups on the surface of BC microfibrils, enhanced the rate of apatite nucleation. Ion exchanged treatment with calcium chloride solution after TEMPO-mediated oxidation was found to be remarkably different from other BC substrates with the highest deposit weight and the smallest apatite globules size. The role of BC substrates to induce mineralization rate differs according to the nature of the BC substrates, which strongly influences the growth behavior of the apatite crystals.

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I.R. spectra of the phosphate ions in various apatites

Cited by 133 publications

References 13 publications

Hydroxyapatite coating on silicon nitride surfaces using the biomimetic method

Hydroxyapatite coating on silicon nitride surfaces using the biomimetic method

Synthesis of potassium chloroapatites, IR, X‐ray and Raman studies

Surface functional group dependent apatite formation on bacterial cellulose microfibrils network in a simulated body fluid

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