Influence of phosphate precursors on the structures of sodium aluminophosphate sols, gels and glasses

Zhang, Long; Eckert, Hellmut

doi:10.1016/j.jnoncrysol.2006.10.089

Cited by 9 publications

(6 citation statements)

References 22 publications

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“…Such modifications can be reflected in a different coordination of the network former such as boron (Yano et al, 2003a;Zhang and Eckert, 2008;Guerette et al, 2015) or in variations in the distribution of nbO, e.g., the disproportionation of 2Q 2 ⇆ Q 3 + Q 1 units (Brawer and White, 1975) (Q n denotes a basic glass forming tetrahedral with n bridging and 4−n non-bridging oxygen atoms). Moreover, changes in the connectivity of the network former polyhedra have also been observed (Yano et al, 2003b).…”

mentioning

confidence: 99%

Influence of Cooling Rate on Cracking and Plastic Deformation during Impact and Indentation of Borosilicate Glasses

et al. 2017

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The influence of a changing glass topology on local mechanical properties was studied in a multitechnique nanomechanical approach. The glass response against sharp contacts can result in structural densification, plastic flow, or crack initiation. By using instrumented indentation testing, the mechanical response was studied in different strain rate regimes for a sodium borosilicate glass (NBS) exhibiting altering structures due to varying processing conditions. Comparison with data from former studies and with literature data on other glass structures helped to elucidate the role of the borate and silicate subnetworks and to understand the overall mechanical properties of the mixed glass systems. A peculiarity of some of the NBS glasses tested in this study is the fact that the connectivity of the borate and silicate entities depends on the sample's thermal history. Although the influence on macroscopic material properties such as E and H is minor, the onset of cracking indeed is influenced by those structural changes within the glass. Rapidly quenched glass shows an improved crack resistance, which is even more pronounced at high strain rates. Studies on various processing conditions further indicate that this transition is closely related to the cooling rate around Tg. The strain rate dependence of cracking is discussed in terms of the occurrence of shear deformation and densification.

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mentioning

confidence: 99%

Influence of Cooling Rate on Cracking and Plastic Deformation during Impact and Indentation of Borosilicate Glasses

et al. 2017

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“…All of the spectra could be simulated successfully, in a progressive manner, with four Gaussian lineshapes. By comparison with the literature [27][28][29][30], these were assigned to Q 0 0 , Q 0 3 , Q 1 2 and Q 0 4 species; the concentrations of each are summarised in Figure 3 and examples of the fits are shown in Figure 4. During the fitting procedure, the difference in peak position between adjacent compositions was constrained to be small, and the changes in area and line width of the peaks were constrained to be smoothly varying as a function of composition.…”

Section: Dtamentioning

confidence: 99%

“…It is apparent that the devitrified samples contain Na + in a mixture of residual glass and a crystal phase; Ca 5 Na 2 (PO 4 ) 4 in the case of T x 1 and an Al + Na doped -TCP phase in the case of T x 2, the latter being close to the Ca 2.4 Al 0.3 Na 0.3 (PO 4 ) 2 composition. [26] or Zhang and Eckert [29][30] in terms of the Al coordination. They did not fit their 31 P spectrum but the peak positions quoted of -13.1 ppm [27] and -12.8 ppm [29][30] are consistent with NAP at  -12.3 ppm and the distribution of structural species, predominantly Q 1 2 (76%) and Q 0 3 (19%) with small amounts of the other species is close to the 75:25 Q 1 2 :Q 0 3 predicted by the Brow model [27].…”

Section: Devitrificationmentioning

confidence: 99%

“…More recent studies on these and similar systems support this general model. [28][29][30] There have been studies published on the structure of borophosphate glass, by Carta et al [31] and Raskar et al [32] (sodium borophosphate), and Jin et al [33] (lithium borophosphate). All three studies come to the conclusion that boron and phosphorus readily form a mixed network, strongly preferring the P It is therefore clear that, at the boron concentration used in this study, the boron environments would be expected to be almost exclusively 4-coordinated, in the absence of Al 3+ .…”

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confidence: 99%

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Vitrification of β-tricalcium phosphate in sodium aluminoborophosphate glass and the effect of Ga3+ substitution

Grigg

Marsden

Mee

et al. 2015

Journal of Solid State Chemistry

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“…As a result of using these electron-carrying mediators, measurements become largely independent of the oxygen partial pressure and can be carried out at lower potentials. [32][33][34] The Os-complex as a redox polymer has been used for mediated electron transfer in biosensors. [24][25][26] Articial mediators such as derivatives of ferrocene, p-phenylenediamine, indophenol or indoaniline, have been used.…”

Section: Introductionmentioning

confidence: 99%

Os-complex-based amperometric bienzyme biosensor for continuous determination of lactate in saliva

Liu

Zhang

2015

Anal. Methods

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An amperometric biosensor, constructed through a specific design featuring a bienzyme doped sol-gel and an Os-complex mediator layer, capped with electropolymerized polyphenol semipermeable membranes, is presented for lactate quantification in saliva. The new enzymatic biosensor exhibits impressive linear and low response times in a phosphate buffer solution of pH 7.0, and a linear dependence of the catalytic current upon lactate bulk concentration is obtained between 0.1 and 1.0 mM (r ¼ 0.997). A detection limit of 0.013 mM can be calculated as three times the standard deviation of the blank signal divided by the sensitivity of the sensor. The selectivity of the biosensor is evaluated by adding common interferent species such as ascorbic acid and uric acid to 0.2 mM lactate; current responses for the interferents are nearly negligible compared to that of the lactate, indicating excellent discriminatory selectivity. The lactate biosensor presents remarkable operational stability in 0.2 mM lactate over a 2 h period and good repeatability in a carry-over test by alternating lactate concentrations. The successful application to whole human saliva samples for continuous monitoring of lactate dynamics makes the amperometric bienzyme biosensor hold considerable promise for diverse biomedical and fitness applications.

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Influence of phosphate precursors on the structures of sodium aluminophosphate sols, gels and glasses

Cited by 9 publications

References 22 publications

Influence of Cooling Rate on Cracking and Plastic Deformation during Impact and Indentation of Borosilicate Glasses

Influence of Cooling Rate on Cracking and Plastic Deformation during Impact and Indentation of Borosilicate Glasses

Vitrification of β-tricalcium phosphate in sodium aluminoborophosphate glass and the effect of Ga3+ substitution

Os-complex-based amperometric bienzyme biosensor for continuous determination of lactate in saliva

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