Use of an Accelerometer and a Microphone as Gas Detectors in the Online Quantitative Detection of Hydrogen Released from Ammonia Borane by Gas Chromatography

Abstract

The use of an accelerometer as a gas detector in gas chromatography (GC) is described for the first time. A milli-whistle was connected to the outlet of the GC capillary. When the eluted and GC carrier gases pass through the capillary and milli-whistle, a sound is produced. After a fast Fourier transform (FFT), the sound wave generated from the milli-whistle is picked up by a microphone and the resulting vibration of the milli-whistle body can be recorded by an accelerometer. The release of hydrogen gas, as the result of thermal energy, from ammonia borane (NH3BH3), which has been suggested as a storage medium for hydrogen, was selected as the model sample. The findings show that the frequencies generated, either by sound or by the vibration from the whistle body, were identical. The concentration levels of the released hydrogen gas can be determined online, based on the frequency changes. Ammonia borane was placed in a brass reservoir, heated continually, and the released hydrogen gas was directly injected into the GC inlet at 0.5 min intervals, using a home-built electromagnetic pulse injector. The concentration of hydrogen for each injection can be calculated immediately. When the ammonia borane was encapsulated within a polycarbonate (PC) microtube array membrane, the temperature required for the release of hydrogen can be decreased, which would make such a material more convenient for use. The findings indicate that 1.0 mg of ammonia borane can produce hydrogen in the range of 1.0-1.25 mL, in the temperature range of 85-115 °C.

Dynamics and fragmentation of van der Waals and hydrogen bonded cluster cations: (NH3)n and (NH3BH3)n ionized at 10.51 eV

“…%) hydrogen, 1,2,4,5 is more hydrogen dense than liquid hydrogen, and can be safely stored at normal temperatures and pressures. 6,7 NH 3 BH 3 is isoelectronic with the simple hydrocarbon C 2 H 6 : it is a crystalline, van der Waals, hydrogen bonded solid at 300 K, and due to the different electronegativities of B and N, ammonia borane is a multi-polar molecule in clusters and the crystal. 2,8 Structures of the NH 3 BH 3 crystal, isolated molecule, and small clusters are studied both experimentally and theoretically in previous research work.…”

An Effective Cell Coculture Platform Based on the Electrospun Microtube Array Membrane for Nerve Regeneration

“…These unique structures of the electrospun MTAM confer several advantages such as a large surface area, a 3-D structure, and a highly porous substrate, with ultrathin walls which allow nutrients, communication molecules, and waste to diffuse easily across the fiber wall. In view of these benefits, electrospun MTAM have been used in a wide range of applications such as microbial fuel cells [Chew et al, 2016], tissue engineering [Shih et al, 2012;Hung et al, 2015], fermentation , hydrogen storage (green energy) [He et al, 2013], and anticancer drug screening for personalized medicine or new anticancer drug development [Wei et al, 2016]. Recently, electrospun PLLA MTAM have been employed as membrane bioreactors for the promotion of neuronal differentiation and orientation [Morelli et al, 2017].…”