AFM analysis of initial stage of reaction between calcite and phosphate

Kamiya, Masakatsu; Hatta, Junko; Shimada, Eriko; Ikuma, Yasuro; Yoshimura, Masahiro; Monma, Hideki

doi:10.1016/s0921-5107(04)00210-7

Cited by 34 publications

(4 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It was found that AFM gives high-contrast, high-resolution images and is an important tool as a source of complementary and/or new structural information. Kamiya et al (2004) reported on AFM analysis of the formation of carbonate-containing hydroxyapatite on a calcite surface due to the reaction with phosphoric acid or phosphate in the initial stage, where the cleaved calcite was immersed in phosphoric acid or diammonium hydrogenphosphate under various conditions. The calcite dissolved upon immersion in phosphoric acid and many pits, oriented in a particular direction, were observed on the calcite surface.…”

Section: Other Surface or Macropore Imaging Techniquesmentioning

confidence: 99%

The microstructure of bioceramics and its analysis

Hayakawa

Tsuru

Osaka

2008

Bioceramics and Their Clinical Applications

View full text Add to dashboard Cite

Section: Other Surface or Macropore Imaging Techniquesmentioning

confidence: 99%

The microstructure of bioceramics and its analysis

Hayakawa

Tsuru

Osaka

2008

Bioceramics and Their Clinical Applications

View full text Add to dashboard Cite

“…Many authors have confirmed experimentally that Diammonium Hydrogen Phosphate (DAP) is an extremely effective consolidating agent 14 , 15 , 34 – 37 . The consolidating principle of DAP is based on its reaction with CaCO 3 and the generation of hydroxyapatite [Ca 10 (PO 4 ) 6 (OH) 2 ] minerals 38 , 39 . Possenti et al 15 demonstrated that the DAP reacts with calcium carbonate in a complex way and can form different intermediate phosphate phases that ultimately reprecipitate in the form of hydroxyapatite.…”

Section: Introductionmentioning

confidence: 99%

In-situ micro-CT scanning and compressive strength assessment of diammonium hydrogen phosphate (DAP) treated chalk

Samarkin,

Amao,

Aljawad

et al. 2023

Sci Rep

View full text Add to dashboard Cite

The occurrence of wellbore mechanical failure is a consequence of the interaction among factors such as in situ stress, rock strength, and engineering procedures. The process of hydrocarbons production, causing reduction of pore pressure, alters the effective stresses in the vicinity of a borehole, leading to borehole instability issues. Estimating the rocks’ elastic modulus and compressive strength is essential to comprehend the rock matrix’s mechanical response during drilling and production operations. This study aimed to assess the practicality of Diammonium Hydrogen Phosphate (DAP) application as a chemical for strengthening chalk in hydrocarbon reservoirs, to make it resistant to high stresses and failure during drilling and production. The mechanical and physical properties of Austin chalk rock samples treated with DAP under mimicked reservoir conditions were studied. The results showed that DAP is a highly effective carbonate rock consolidating agent that improves the mechanical strength of the chalk. Compressive test measurements conducted on rocks treated at two different temperatures (ambient and 50 °C) showed that DAP effectively strengthened the rock matrix, resulting in an increase in its compressive strength (22–24%) and elastic modulus (up to 115%) compared to the untreated sample. The favorable outcomes of this research suggest that the DAP solution holds promise as a consolidation agent in hydrocarbon reservoirs. This contributes to the advancement of knowledge regarding effective strategies for mitigating mechanical failures of the wellbore during drilling and production.

show abstract

“…Hydroxyapatite (HAP) (Ca 5 (PO 4 ) 3 OH), often written as Ca 10 (PO 4 ) 3 (OH) 2 is a naturally occurring mineral from the calcium orthophosphate family, stable in a wide pH range between 4 and 14 ,. It is a http://en.wikipedia.org/wiki/Endmember_%2528mineralogy%2529 of the complex apatite group and may have a variable composition wherein: (a) the OH − group is replaced by other anions (A‐type substitution); (b) the

{PO}_{4}^{3 -}

group undergoes anion substitution (B‐type substitution),; or (c) both OH − and

{PO}_{4}^{3 -}

groups undergo simultaneous substitution (AB‐substitution) . Depending upon the circumstances, that is, temperature, pressure, aqueous conditions, and reactant chemistry, the extent of anionic replacement can be partial or complete.…”

Section: Introductionmentioning

confidence: 99%

Phase relations in the calcium carbonate/ammonium phosphate system under aqueous conditions and 25°C

Balonis

Kakoulli

2020

J Am Ceram Soc

View full text Add to dashboard Cite

A theoretical and experimental approach was applied to investigate phase relations in a system containing calcium carbonate and different ammonium phosphate solutions. Using laboratory experiments and thermodynamic modeling, this paper provides an insight into the formation of stable phase assemblages in the calcium carbonate and mono‐, di‐, triammonium phosphate aqueous system. Focus is placed on the morphological and mineralogical characterization and thermodynamic calculation of calcium phosphates precipitating due to the reaction between the calcium carbonate and ammonium phosphate solutions. Correlations between the formed stable calcium phosphate phases and the ammonium phosphate precursors are provided. Advantages and limitations of various analytical and modeling techniques used in this study such as geochemical equilibrium‐based modeling, X‐ray diffraction, scanning electron microscopy, and thermal analysis, are critically evaluated. Additionally, possible impacts of the ammonium phosphate solution type on the kinetics of phase transformations are discussed.

show abstract

AFM analysis of initial stage of reaction between calcite and phosphate

Cited by 34 publications

References 8 publications

The microstructure of bioceramics and its analysis

The microstructure of bioceramics and its analysis

In-situ micro-CT scanning and compressive strength assessment of diammonium hydrogen phosphate (DAP) treated chalk

Phase relations in the calcium carbonate/ammonium phosphate system under aqueous conditions and 25°C

Contact Info

Product

Resources

About