Raman Spectroscopy of Ammonia Borane at Low Temperature and High Pressure

Najiba, Shah; Chen, Jiuhua; Drozd, Vadym; Durygin, Andriy; Sun, Yongzhou

doi:10.1002/9781118365038.ch40

Energy Technology 2012 2012

DOI: 10.1002/9781118365038.ch40

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Raman Spectroscopy of Ammonia Borane at Low Temperature and High Pressure

Shah Najiba¹,

Jiuhua Chen²,

Vadym Drozd³

et al.

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Cited by 2 publications

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References 27 publications

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“…The physic-sorption effect can be quenched to very low pressure that near ambient condition. Another important finding that should be mentioned here is that the di-hydrogen bonding effect, which has been discussed in many Raman studies under high pressure [9,17,[24][25][26]. As previous reported, formation of B-H•••H-N di-hydrogen bond [24,27] makes B-H stretching frequency shift positively and N-H stretching frequency shift negatively with increasing pressure.…”

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confidence: 63%

Behavior of Decomposed Ammonia Borane at High Pressure up to ~10 GPa

Sun

Chen

Drozd

et al. 2014

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We conductedin situRaman spectroscopy study on ammonia borane loaded in diamond anvil cell (DAC). The ammonia borane was decomposed at around 140 degree Celsius under the pressure ~0.7 GPa. Raman spectra show the hydrogen was desorbed within 1 hour at 140 degree Celsius. The hydrogen was sealed in the DAC well and cooled down near to room temperature. Applying higher pressure up to ~10 GPa indicates interactions between the products and loss of dihydrogen bonding. No rehydrogenation was detected in the pressure range investigated.Keywords: Ammonia borane; Diamond anvil cell; High pressure; Phase transition

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supporting

confidence: 63%

Behavior of Decomposed Ammonia Borane at High Pressure up to ~10 GPa

Sun

Chen

Drozd

et al. 2014

MSF

Self Cite

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Size Dependence of the Tetragonal to Orthorhombic Phase Transition of Ammonia Borane in Nanoconfinement

Najiba,

Chen,

Islam

et al. 2024

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We have investigated the thermodynamic property modification of ammonia borane via nanoconfinement. Two different mesoporous silica scaffolds, SBA-15 and MCM-41, were used to confine ammonia borane. Using in situ Raman spectroscopy, we examined how pore size influences the phase transition temperature from tetragonal (I4mm) to orthorhombic (Pmn21) for ammonia borane. In bulk ammonia borane, the phase transition occurs at around 217 K; however, confinement in SBA-15 (with ~8 nm pore sizes) reduces this temperature to approximately 195 K, while confinement in MCM-41 (with pore sizes of 2.1–2.7 nm) further lowers it to below 90 K. This suppression of the phase transition as a function of pore size has not been previously studied using Raman spectroscopy. The stability of the I4mm phase at a much lower temperature can be interpreted by incorporating the surface energy terms to the overall free energy of the system in a simple thermodynamic model, which leads to a significant increase in the surface energy when transitioning from the tetragonal phase to the orthorhombic phase.

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Raman Spectroscopy of Ammonia Borane at Low Temperature and High Pressure

Cited by 2 publications

References 27 publications

Behavior of Decomposed Ammonia Borane at High Pressure up to ~10 GPa

Behavior of Decomposed Ammonia Borane at High Pressure up to ~10 GPa

Size Dependence of the Tetragonal to Orthorhombic Phase Transition of Ammonia Borane in Nanoconfinement

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