Phase transitions in physisorbed ethane investigated by positron-annihilation spectroscopy

Jain, P. C.; Lee, S. K.; Hozhabri, N.; Sharma, S. C.

doi:10.1103/physrevb.60.2057

Cited by 3 publications

(1 citation statement)

References 33 publications

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“…The sensitivity of the positron annihilation parameters to phase transformations has been amply demonstrated in many liquid crystal forming materials [1][2][3]. These parameters have also been used in detecting some molecular motions [4,5].…”

Section: Introductionmentioning

confidence: 99%

Investigation of molecular modes in K18 employing positron lifetime spectroscopy

Singh

Jain

2007

Physica B: Condensed Matter

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Section: Introductionmentioning

confidence: 99%

Investigation of molecular modes in K18 employing positron lifetime spectroscopy

Singh

Jain

2007

Physica B: Condensed Matter

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Phases of ethane adsorbed on purified HiPco single-walled carbon nanotubes

Rawat¹,

Migone²

2007

Phys. Rev. B

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have measured adsorption isotherms of ethane on purified HiPco SWNTs for coverages in the first layer. We wanted to investigate the existence of different phases for ethane as a function of coverage on this substrate, and to compare the results to those on planar graphite. We measured isotherms at 103, 110,150, 160, and 165K. We used the low-coverage isotherm data to obtain an estimate for the binding energy of ethane on the SWNTs; we found a value of 363 meV for this quantity. This binding energy value is 1.81 times greater than the corresponding one for this quantity on planar graphite. We have also determined the coverage dependence of isosteric heat of adsorption for ethane using the results for isotherms obtained at above-mentioned temperatures.

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Study of Molecular Motions in Two Liquid Crystal Forming Compounds Employing PLS

Singh¹,

Sharma²,

Jain³

2006

Int. J. Mod. Phys. B

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Results of molecular motion studies carried out in two liquid crystal forming compounds n-p-cyano-p-hexyloxybiphenyl (M18) and n-p-ethoxybenzylidene-p-butylaniline (EBBA) using positron lifetime spectroscopy (PLS) are presented. Temperature dependent positron lifetime measurements have been performed in each compound during the heating cycle of samples prepared by either quenching or slow cooling from the respective liquid crystalline phase of the compounds. In both the compounds, behaviors of the quenched and slow cooled samples are found to be different. The material in the quenched sample, unlike the slow-cooled sample, exhibits strong temperature dependence before it undergoes a glass transition. In each case, the temperature dependence of o-Ps pick-off lifetime in the quenched sample shows broad peaks at various characteristic temperatures. These peaks have been attributed to various intra- and inter-molecular motions associated with these compounds. The characteristic frequencies of some of the modes observed in the present work agree well with the literature reported values obtained from FIR and Raman studies. The present study demonstrates the usefulness of PLS in the study of molecular motions.

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Phase transitions in physisorbed ethane investigated by positron-annihilation spectroscopy

Cited by 3 publications

References 33 publications

Investigation of molecular modes in K18 employing positron lifetime spectroscopy

Investigation of molecular modes in K18 employing positron lifetime spectroscopy

Phases of ethane adsorbed on purified HiPco single-walled carbon nanotubes

Study of Molecular Motions in Two Liquid Crystal Forming Compounds Employing PLS

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