The F content in sol-gel derived FHA coatings: An XPS study

Kui Cheng; Sam Zhang; Wenjian Weng

doi:10.1016/j.surfcoat.2004.10.023

The F content in sol-gel derived FHA coatings: An XPS study

Kui Cheng^*
, Sam Zhang
, Wenjian Weng

^*Corresponding author for this work

Nanyang Technological University
Zhejiang University

Research output: Contribution to journal › Article › peer-review

60 Scopus citations

Abstract

Fluoridated hydroxyapatite (FHA) coatings have good bioactivity and small solubility in body fluid and thus have good potential as alternative for pure hydroxyapatite (HA) in bioactive applications. Bioactivity and solubility are sensitive to fluorine content in the coatings. In this work, Ca(NO₃)₂, P₂ O₅ and HPF₆ are used to prepare FHA coatings. The fluorine content of the coatings is characterized by means of X-ray photoelectron spectroscopy (XPS) analysis and a pF-meter with a fluorine-sensitive electrode. The XPS results of the F/Ca ratio are in good agreement with the HPF₆/Ca ratio designed in the dipping sol when F/Ca is below 0.2. The F/Ca ratio saturates at 0.2 as fluorapatite forms. Upon saturation of F in FHA, the extra fluorine is believed to vaporize and evade the coating as HF formed from the reaction between CaF₂ and the acidic P-containing groups. For the same reason, the fluorine content in the coating is also affected by the Ca/P ratio in the dipping sol.

Original language	English
Pages (from-to)	237-241
Number of pages	5
Journal	Surface and Coatings Technology
Volume	198
Issue number	1-3 SPEC. ISS.
DOIs	https://doi.org/10.1016/j.surfcoat.2004.10.023
State	Published - 1 Aug 2005
Externally published	Yes

Keywords

B Photoelectron spectroscopy
C Sol-gel
D Fluoridated hydroxyapatite

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10.1016/j.surfcoat.2004.10.023

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title = "The F content in sol-gel derived FHA coatings: An XPS study",

abstract = "Fluoridated hydroxyapatite (FHA) coatings have good bioactivity and small solubility in body fluid and thus have good potential as alternative for pure hydroxyapatite (HA) in bioactive applications. Bioactivity and solubility are sensitive to fluorine content in the coatings. In this work, Ca(NO3)2, P2 O5 and HPF6 are used to prepare FHA coatings. The fluorine content of the coatings is characterized by means of X-ray photoelectron spectroscopy (XPS) analysis and a pF-meter with a fluorine-sensitive electrode. The XPS results of the F/Ca ratio are in good agreement with the HPF6/Ca ratio designed in the dipping sol when F/Ca is below 0.2. The F/Ca ratio saturates at 0.2 as fluorapatite forms. Upon saturation of F in FHA, the extra fluorine is believed to vaporize and evade the coating as HF formed from the reaction between CaF2 and the acidic P-containing groups. For the same reason, the fluorine content in the coating is also affected by the Ca/P ratio in the dipping sol.",

keywords = "B Photoelectron spectroscopy, C Sol-gel, D Fluoridated hydroxyapatite",

author = "Kui Cheng and Sam Zhang and Wenjian Weng",

year = "2005",

month = aug,

day = "1",

doi = "10.1016/j.surfcoat.2004.10.023",

language = "英语",

volume = "198",

pages = "237--241",

journal = "Surface and Coatings Technology",

issn = "0257-8972",

publisher = "Elsevier B.V.",

number = "1-3 SPEC. ISS.",

}

TY - JOUR

T1 - The F content in sol-gel derived FHA coatings

T2 - An XPS study

AU - Cheng, Kui

AU - Zhang, Sam

AU - Weng, Wenjian

PY - 2005/8/1

Y1 - 2005/8/1

N2 - Fluoridated hydroxyapatite (FHA) coatings have good bioactivity and small solubility in body fluid and thus have good potential as alternative for pure hydroxyapatite (HA) in bioactive applications. Bioactivity and solubility are sensitive to fluorine content in the coatings. In this work, Ca(NO3)2, P2 O5 and HPF6 are used to prepare FHA coatings. The fluorine content of the coatings is characterized by means of X-ray photoelectron spectroscopy (XPS) analysis and a pF-meter with a fluorine-sensitive electrode. The XPS results of the F/Ca ratio are in good agreement with the HPF6/Ca ratio designed in the dipping sol when F/Ca is below 0.2. The F/Ca ratio saturates at 0.2 as fluorapatite forms. Upon saturation of F in FHA, the extra fluorine is believed to vaporize and evade the coating as HF formed from the reaction between CaF2 and the acidic P-containing groups. For the same reason, the fluorine content in the coating is also affected by the Ca/P ratio in the dipping sol.

AB - Fluoridated hydroxyapatite (FHA) coatings have good bioactivity and small solubility in body fluid and thus have good potential as alternative for pure hydroxyapatite (HA) in bioactive applications. Bioactivity and solubility are sensitive to fluorine content in the coatings. In this work, Ca(NO3)2, P2 O5 and HPF6 are used to prepare FHA coatings. The fluorine content of the coatings is characterized by means of X-ray photoelectron spectroscopy (XPS) analysis and a pF-meter with a fluorine-sensitive electrode. The XPS results of the F/Ca ratio are in good agreement with the HPF6/Ca ratio designed in the dipping sol when F/Ca is below 0.2. The F/Ca ratio saturates at 0.2 as fluorapatite forms. Upon saturation of F in FHA, the extra fluorine is believed to vaporize and evade the coating as HF formed from the reaction between CaF2 and the acidic P-containing groups. For the same reason, the fluorine content in the coating is also affected by the Ca/P ratio in the dipping sol.

KW - B Photoelectron spectroscopy

KW - C Sol-gel

KW - D Fluoridated hydroxyapatite

UR - https://www.scopus.com/pages/publications/20744456613

U2 - 10.1016/j.surfcoat.2004.10.023

DO - 10.1016/j.surfcoat.2004.10.023

M3 - 文章

AN - SCOPUS:20744456613

SN - 0257-8972

VL - 198

SP - 237

EP - 241

JO - Surface and Coatings Technology

JF - Surface and Coatings Technology

IS - 1-3 SPEC. ISS.

ER -

The F content in sol-gel derived FHA coatings: An XPS study

Abstract

Keywords

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