ANOMALOUS ULTRASONIC ABSORPTION IN A NEMATIC AND A POLYMESOMORPHIC LIQUID CRYSTAL.

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Abstract

Ultrasonic absorption measurements were carried out in a nematic liquid crystal, p-(p prime -ethoxyphenylazo) phenylundecylenate (EPAPU) and a polymesomorphic liquid crystal p-n-decyloxybenzoyl-p-cresol (DBC) with nematic and smectic phases, at a frequency of 2 MHz. The transition temperatures of these liquid crystals observed through thermal microscopy are given. An ultrasonic flow detector, UFD67 (ECIL) facilitated absorption measurements. The ultrasonic cell was a double walled cylindrical vessel with providsion for circulating glycerol at any desired temperature. The temperature was controlled to plus or minus 0. 2 degree C by circulating glycerol through the cell from a thermostat. A quartz crystal was fixed at the bottom of the generating cell. The ultrasonic pulses generated from the transmitting crystal propagate normally from the crystal till they are reflected back from the reflector at the top. The reflector can be moved up and down, the position of which can be determined accurately by a micrometer screw attached to it.

Original languageEnglish
JournalPhysica Status Solidi (A) Applied Research
Volume92
Issue number1
Publication statusPublished - Jan 1 1985

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Ultrasonic absorption
Liquid Crystals
Liquid crystals
ultrasonics
Ultrasonics
liquid crystals
Glycerol
Crystals
glycerols
reflectors
Thermostats
Quartz
Nematic liquid crystals
cells
cresols
thermostats
Superconducting transition temperature
Microscopic examination
screws
quartz crystals

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

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abstract = "Ultrasonic absorption measurements were carried out in a nematic liquid crystal, p-(p prime -ethoxyphenylazo) phenylundecylenate (EPAPU) and a polymesomorphic liquid crystal p-n-decyloxybenzoyl-p-cresol (DBC) with nematic and smectic phases, at a frequency of 2 MHz. The transition temperatures of these liquid crystals observed through thermal microscopy are given. An ultrasonic flow detector, UFD67 (ECIL) facilitated absorption measurements. The ultrasonic cell was a double walled cylindrical vessel with providsion for circulating glycerol at any desired temperature. The temperature was controlled to plus or minus 0. 2 degree C by circulating glycerol through the cell from a thermostat. A quartz crystal was fixed at the bottom of the generating cell. The ultrasonic pulses generated from the transmitting crystal propagate normally from the crystal till they are reflected back from the reflector at the top. The reflector can be moved up and down, the position of which can be determined accurately by a micrometer screw attached to it.",
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N2 - Ultrasonic absorption measurements were carried out in a nematic liquid crystal, p-(p prime -ethoxyphenylazo) phenylundecylenate (EPAPU) and a polymesomorphic liquid crystal p-n-decyloxybenzoyl-p-cresol (DBC) with nematic and smectic phases, at a frequency of 2 MHz. The transition temperatures of these liquid crystals observed through thermal microscopy are given. An ultrasonic flow detector, UFD67 (ECIL) facilitated absorption measurements. The ultrasonic cell was a double walled cylindrical vessel with providsion for circulating glycerol at any desired temperature. The temperature was controlled to plus or minus 0. 2 degree C by circulating glycerol through the cell from a thermostat. A quartz crystal was fixed at the bottom of the generating cell. The ultrasonic pulses generated from the transmitting crystal propagate normally from the crystal till they are reflected back from the reflector at the top. The reflector can be moved up and down, the position of which can be determined accurately by a micrometer screw attached to it.

AB - Ultrasonic absorption measurements were carried out in a nematic liquid crystal, p-(p prime -ethoxyphenylazo) phenylundecylenate (EPAPU) and a polymesomorphic liquid crystal p-n-decyloxybenzoyl-p-cresol (DBC) with nematic and smectic phases, at a frequency of 2 MHz. The transition temperatures of these liquid crystals observed through thermal microscopy are given. An ultrasonic flow detector, UFD67 (ECIL) facilitated absorption measurements. The ultrasonic cell was a double walled cylindrical vessel with providsion for circulating glycerol at any desired temperature. The temperature was controlled to plus or minus 0. 2 degree C by circulating glycerol through the cell from a thermostat. A quartz crystal was fixed at the bottom of the generating cell. The ultrasonic pulses generated from the transmitting crystal propagate normally from the crystal till they are reflected back from the reflector at the top. The reflector can be moved up and down, the position of which can be determined accurately by a micrometer screw attached to it.

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