Crystal structure, vibrational spectra and thermal decomposition study of a new, dicationic, acidic pyrophosphate: KHMgP2O7⋅2H2O

Assaaoudi, Hassane; Butler, Ian S.; Koziński, Janusz A.; Bélanger‐Gariépy, Francine

doi:10.1007/s10870-005-4551-z

Cited by 9 publications

(5 citation statements)

References 44 publications

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“…During the swelling, APP degrades (the spectra corresponding to the two different layers are similar and only one of them is shown). The peak at À11 ppm is attributed to the formation of orthophosphates linked to aromatic species and/or pyrophosphates [17]. The presence of phosphoric acid is revealed by the thin peak at 0 ppm.…”

Section: Epoxy_app-5mentioning

confidence: 99%

Reaction to fire of an intumescent epoxy resin: Protection mechanisms and synergy

Gérard

Fontaine

Bellayer

et al. 2012

Polymer Degradation and Stability

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This study investigates the effects of the incorporation of nanoparticles on the reaction to fire of an epoxy resin containing a conventional intumescent flame retardant. Two types of nanoparticles are considered: OctaMethylOligomericSilsesquioxanes (OMPOSS) and Carbon NanoTubes (CNTs). The combination of an intumescent phosphorus-based flame-retardant (APP) and CNTs provides no enhancement of the reaction to fire of this system. In contrast, using OMPOSS in combination with APP provides a large synergistic effect via an intumescence phenomenon. The study of the thermal degradation of these systems shows that the interactions between these fillers modify the viscosity of the degraded matrix. The trapping of degradation gases is enhanced in the case of APP/OMPOSS, which results in the creation of an intumescent protective layer earlier than with the reference system containing APP alone. Furthermore, the presence of OMPOSS permits the creation of silicophosphates which reinforce the residue. In contrast, the residue of the formulation containing carbon nanotubes is excessively stiff and it cracks during combustion, hindering the proper formation of the protective layer.

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Section: Epoxy_app-5mentioning

confidence: 99%

Reaction to fire of an intumescent epoxy resin: Protection mechanisms and synergy

Gérard

Fontaine

Bellayer

et al. 2012

Polymer Degradation and Stability

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“…These features are known to be characteristic of the pyrophosphate (P 2 O 7 ) groups. 23,28,[31][32][33] The presence of pyrophosphate phases such as TiP 2 O 7 in NTP has been reported before and is known to affect the electrochemical properties of this system. The possible presence and influence of such impurities on sol-gel prepared NTP will be discussed in more detail in the following sections.…”

Section: Resultsmentioning

confidence: 90%

“…24,35 Finally, the low-frequency bands in the range 380-230 cm −1 could be assigned to the torsional P-O-P and P-O-(H) deformation modes. 33 Although, the asymmetric P-O-P bridge vibrations identified by FT-IR are not very pronounced in the Raman spectra, in the latter case they are known to be weak. No other noticeable impurity bands were observed in the studied samples, except for a small peak around 150 cm −1 which could coincide with a characteristic anatase TiO 2 Raman peak at ca.…”

Section: Resultsmentioning

confidence: 97%

“…The bands at 1101.5, 1011.5 cm −1 and 990, 973 cm −1 are assigned to the symmetric and antisymmetric stretching vibrations of the PO 4 groups, respectively. 28,[33][34][35][36] A weak band at around 550 cm −1 corresponds to the antisymmetric bending mode of PO 4 , while a stronger one at around 436 cm −1 to the symmetric bending of PO 4 or the asymmetric bending of TiO 6 octahedra. 24,35 Finally, the low-frequency bands in the range 380-230 cm −1 could be assigned to the torsional P-O-P and P-O-(H) deformation modes.…”

Section: Resultsmentioning

confidence: 99%

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Electrochemical Performance of Sol-Gel Synthesized NaTi₂(PO₄)₃- Carbon Composites as Aqueous Na-Ion Battery Anodes

Tutliene

Petrulevičienė

Pilipavičius

et al. 2021

J. Electrochem. Soc.

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Aqueous Na-ion based batteries are considered promising candidates for replacing Li-ion technologies, especially in the area of stationary energy storage. Research and development of novel electrode materials remain a central research effort in this field. NASICON-structured NaTi2(PO4)3 phosphate framework has attracted a great deal of attention and remains the most studied negative electrode material for aqueous Na-ion batteries. The active material preparation and carbon composite property tailoring play a critical role in the electrode materials engineering process which governs the performance of an entire electrochemical system. We present a study of a series of aqueous sol-gel synthesized NaTi2(PO4)3—carbon composites using three different sol-gel approaches and three distinct pyrolysis/calcination strategies. The structural and morphological analysis shows that both the sol-gel route as well as the thermal treatment strategy have significant effects on active material purity and degree of crystallinity as well as the content and properties of the carbonaceous phase. Electrochemical investigations of these composites also show strong effects of the materials structure and carbon matrix morphology on the electrochemical performance and degradation of these materials when employed as aqueous Na-ion battery negative electrodes.

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“…The main feature on the ATR‐IR spectra (Figure 1) of the BPs are the NH stretching vibration bands ν NH at 3479 cm −1 for ALN, 3382 cm −1 for APBP, and 3332 cm −1 for IBP and the bands assigned to the phosphonate groups: ν asPO2 , 1100 cm −1 for ALN, 1206 cm −1 for APBP, and 1214 cm −1 for IBP; ν PO2 , 1100 cm −1 for ALN, 1182 cm −1 for APBP, and 1184 cm −1 for IBP; ν asP‐OH , 1016, 973, 953, and 914 cm −1 for ALN, 1061, 1052, 1022, and 925 cm −1 for APBP, and 1059, 1048, 1002, and 915 cm −1 for IBP; ν asPOP , 866 cm −1 for ALN, 868 cm− 1 for APBP, and 878 cm −1 for IBP; ν sP‐OH , 824 cm −1 for ALN, 781 cm −1 for APBP, and 762 cm −1 for IBP 23…”

Section: Resultsmentioning

confidence: 96%

Acrylic injectable and self‐curing formulations for the local release of bisphosphonates in bone tissue

et al. 2007

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Two bisphosphonates (BPs), namely 1‐hydroxy‐2‐[4‐aminophenyl]ethane‐1,1‐diphosphonic acid (APBP) and 1‐hydroxy‐2‐[3‐indolyl]ethane‐1,1‐diphosphonic acid (IBP), have been synthesized and incorporated to acrylic injectable and self‐curing formulations. Alendronic acid monosodium trihydrated salt (ALN) containing cement was formulated as control. These systems have potential applications in low density hard tissues affected by ailments characterized by a high osteoclastic resorption, i.e. osteoporosis and osteolysis. Values of curing parameters of APBP and IBP were acceptable to obtain pastes with enough fluency to be injected through a biopsy needle into the bone cavity. Working times ranged between 8 and 15 min and maximum temperature was around 50°C. Cured systems stored for a month in synthetic body fluid had compressive strengths between 90 and 96 MPa and modulus between 1.2 and 1.3 GPa, which suggest mechanical stabilization after setting and in the short time. BPs were released in PBS at an initial rate depending on the corresponding chemical structure in the order ALN > APBP > IBP to give final concentrations in PBS of 2.21, 0.44, and 0.19 mol/mL for ALN, APBP, and IBP, respectively. Cytotoxicities of bisphosphonates were evaluated, IC50 values being in the order APBP > ALN > IBP. Absence of cytotoxicity coming from leachables of the cured systems was observed in all cases independently of the BP. An improved cell growth and proliferation for the systems loaded with APBP and IBP compared with that loaded with ALN was observed, as assessed by measuring cell adhesion and proliferation, and total DNA content. © 2007 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2007

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Crystal structure, vibrational spectra and thermal decomposition study of a new, dicationic, acidic pyrophosphate: KHMgP2O7⋅2H2O

Cited by 9 publications

References 44 publications

Reaction to fire of an intumescent epoxy resin: Protection mechanisms and synergy

Reaction to fire of an intumescent epoxy resin: Protection mechanisms and synergy

Electrochemical Performance of Sol-Gel Synthesized NaTi₂(PO₄)₃- Carbon Composites as Aqueous Na-Ion Battery Anodes

Acrylic injectable and self‐curing formulations for the local release of bisphosphonates in bone tissue

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Crystal structure, vibrational spectra and thermal decomposition study of a new, dicationic, acidic pyrophosphate: KHMgP2O7⋅2H2O

Cited by 9 publications

References 44 publications

Reaction to fire of an intumescent epoxy resin: Protection mechanisms and synergy

Reaction to fire of an intumescent epoxy resin: Protection mechanisms and synergy

Electrochemical Performance of Sol-Gel Synthesized NaTi2(PO4)3- Carbon Composites as Aqueous Na-Ion Battery Anodes

Acrylic injectable and self‐curing formulations for the local release of bisphosphonates in bone tissue

Contact Info

Product

Resources

About

Electrochemical Performance of Sol-Gel Synthesized NaTi₂(PO₄)₃- Carbon Composites as Aqueous Na-Ion Battery Anodes