The Raman spectrum of boric acid

Krishnan, K.

doi:10.1007/bf03046322

Cited by 49 publications

(34 citation statements)

References 7 publications

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“…A weak absorption peak at 642/cm ‐1 , (B‐B) can be associated with the layered structure of ReB 2 . The Raman spectrum shows peaks at 208/cm ‐1 , (lattice oscillation), 500/cm ‐1 , (O‐B‐O), and 881/cm ‐1 , (B‐O), all attributed to vibration modes of H 3 BO 3 . Peaks at 338, 928, and 981/cm ‐1 , correspond to symmetric and antisymmetric stretching modes of tetrahedral [ReO 4 ] −1 ion and other characteristic modes …”

Section: Resultsmentioning

confidence: 98%

Chemical stability of superhard rhenium diboride at oxygen and moisture ambient environmental conditions prepared by mechanical milling

et al. 2018

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In this study, rhenium diboride (ReB2) was obtained by mechanosynthesis at 640 minutes of milling. The obtained ReB2 was stored at oxygen and moisture ambient environmental conditions to know the chemical stability. The results indicate that ReB2 is totally decomposed at oxygen and moisture ambient environmental conditions. Furthermore, the X‐ray diffraction (XRD) analysis of ReB2 samples after 26 months of storage shows that the final products of degradation are HReO4 (liquid), H3BO3, HBO2, and ReO3. Finally, a schematic diagram of the degradation sequence of ReB2 at oxygen and moisture ambient environmental conditions is proposed and validated with a thermodynamic analysis.

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Section: Resultsmentioning

confidence: 98%

Chemical stability of superhard rhenium diboride at oxygen and moisture ambient environmental conditions prepared by mechanical milling

et al. 2018

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“…1a and b. Although Cu(II) solutions show two cathodic peaks that correspond to successive electron transfer reactions of Cu(II) and Cu(I) and their corresponding anodic peaks on the reverse scan in aqueous media for the CVs of Cu(II) solutions indicated above, only one reduction (E pc = -160 and -460 mV for 0.08 and 0.25, respectively) and one re-oxidation peak (E pa = 740 and 900 mV, for 0.08 and 0.25 respectively) in THF-water mixture were observed [38]. Comparison of the peak potential differences, DE, suggest that reversibility of the redox reaction decreases with increase in copper concentration (Table 1).…”

Section: Resultsmentioning

confidence: 86%

Voltammetric investigation of polyelectrolyte-Cu(II) complexes

2007

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The complexation behaviours of poly(N-vinylcarbazole) (PNVCz), poly(acrylic acid) (PAA) poly(itaconic acid) (PIA) and their copolymers, synthesized by using different initial monomer compositions, with Cu(II) ions were investigated by the voltammetric technique. Their solutions were prepared in THF-water mixture according to the water-insoluble nature of PNVCz and its copolymers. The polymeric ligand-Cu(II) interactions, i.e. complex formations were studied as a function of copper ion concentration and copolymer composition. It was observed that although the cyclic voltammogram (CV) of Cu(II) alone in THF-water mixture was characterized by one redox wave, which has an irreversible nature, it became more reversible in the presence of polymer. Further, the CV results indicated the presence of two different electron transfer mechanisms, depending on the n COOH / n Cu(II) ratio and the carboxyl content of the copolymers.

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“…In the spectrum of the initial boric acid coating, the strongest peak centered near 3230 and 3285 cm -1 is attributed to the BO-H stretching vibrations of boric acid [35][36][37][38][39]. The weak triplet peaks at 2260, 2356, and 2500 cm -1 are combination bands characteristic to boric acid [39]. Another strong peak centered near 1520 cm -1 , with a shoulder at 1450 cm -1 , represents the B-O stretching of boric acid [35][36][37][38][39].…”

Section: Spectroscopic Investigation Of the Adsorbed Molecules On Bormentioning

confidence: 92%

“…A spectrum of the water layer formed on the bare copper with no coating at the saturation vapor condition is also shown for comparison. In the spectrum of the initial boric acid coating, the strongest peak centered near 3230 and 3285 cm -1 is attributed to the BO-H stretching vibrations of boric acid [35][36][37][38][39]. The weak triplet peaks at 2260, 2356, and 2500 cm -1 are combination bands characteristic to boric acid [39].…”

Section: Spectroscopic Investigation Of the Adsorbed Molecules On Bormentioning

confidence: 93%

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Origin of Ultra-Low Friction of Boric Acid: Role of Vapor Adsorption

2015

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Boric acid is a lamellar solid lubricant that can give an ultra-low friction coefficient. The origin of this ultra-low friction of boric acid was investigated using tribology and spectroscopy techniques in inert, humid, and organic vapor conditions. It was found that boric acid itself experiences high friction and catastrophic surface wear when rubbed with a stainless steel ball in dry nitrogen or oxygen environments, but it gives very low friction (l = 0.06) in humid and acetone vapor environments. Short-chain alcohol vapors (ethanol and n-pentanol) did not show these ultra-low friction values. Vibrational spectroscopy indicates that the lubricating vapors do not adsorb on the basal plane of the boric acid crystal but likely adsorb onto the edge sites of the lamella. The alcohol molecules impinging from the gas phase readily react with the boric acid to form a high vapor pressure molecule that desorbs from the surface. The ''unlocking'' of the highenergy edge sites by adsorbed acetone and water vapor appears to be needed for the lamella to shear along the basal plane direction.

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The Raman spectrum of boric acid

Cited by 49 publications

References 7 publications

Chemical stability of superhard rhenium diboride at oxygen and moisture ambient environmental conditions prepared by mechanical milling

Chemical stability of superhard rhenium diboride at oxygen and moisture ambient environmental conditions prepared by mechanical milling

Voltammetric investigation of polyelectrolyte-Cu(II) complexes

Origin of Ultra-Low Friction of Boric Acid: Role of Vapor Adsorption

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