bnseries_textures
TRANSCRIPT
Bhowmik Compounds
Bn Series
Optical Microscopy : Mike FischX-ray Diffraction: Lee Sharpnack and Tyler Harris
Funding: NSF US Ireland R&D Partnership under Award # 1410649
Acknowledgments:
Compound Phase Transition/Temperature (⁰C)
B12
B13
B14
B15
B16
B17
B18
B19
B20
I Sm A Cr95.6 67.2
I Sm A Cr109 49.2
I Sm A Cr97.5 65.3
I Sm A Cr110.3 49.5
I Sm A Cr97.8 27.2
I Sm A Cr109.5 61.7
I Sm X Cr97.1 31.2
I Sm A Cr108.2 51.7
I Cr56.2
Compound D-spacing (Å)
B12 27.60
B13 28.82
B14 29.74
B15 30.79
B16 31.25
B17 34.11
B18 33.98
B19 -
B20 Crystal
B12Optical Textures
94oC 67.8oC
67.2oC 38.6oC
SmA
SmX
B12
X-ray Diffratction
90 C Sm A⁰ 70 C Crystal⁰
X-ray Diffraction confirms Smectic A phase.
B13Optical Textures
108oC 90oC 80oC
78.2oC 55oC 50.2oC
SmA SmX
Crystal?
55oC
B13X-ray Diffraction
108 C Sm A⁰ 86 C Sm A⁰ 82 C Sm A⁰
B13X-ray Diffraction
58 C Crystal⁰78 C Sm A⁰
X-ray Diffraction confirms Smectic A phase.
B14Optical Textures
93.6oC 66.3oC
65.3oC
SmX
SmA
B14X-ray Diffraction
96.5 C Sm A⁰ 67 C Crystal⁰
X-ray Diffraction confirms Smectic A phase.
B15Optical Textures
104oC 74oC
55oC 49.9oC
SmA
Crystal
B15X-ray Diffraction
110 C Sm A⁰ 70 C Sm A⁰
B15X-ray Diffraction
60 C Sm A⁰ 50 C Crystal?⁰
X-ray Diffraction confirms Smectic A phase.
B16Optical Textures
96.8oC 70oC
65.5oC 34.7oC
SmA
SmC
B16X-ray Diffraction
96 C Sm A⁰ 74 C Sm A⁰ 63 C Crystal⁰
X-ray Diffraction confirms Smectic A phase. No Smectic C phase found in this compound
B17Optical Textures
105oC 94.6oC 93.6oC
90oC 65.7oC 61.7oC
SmA
CrystalSmX
B17
X-ray diffraction
109⁰C Sm A 100 C Sm A⁰ 90 C Sm A⁰
B17
X-ray diffraction
70 C Sm A⁰ 60 C Crystal⁰
X-ray Diffraction confirms Smectic A phase.
B18Optical Textures
90oC 70oC
64.7oC 33.4oC
SmA SmA
SmC? Crystal
B18X-ray Diffraction
96 C Sm A⁰ 70 C Sm A⁰
B18X-ray Diffraction
65 C Sm A⁰ 31.2 C Crystal?⁰X-ray Diffraction confirms Smectic A phase.
B19Optical Textures
106oC 60oC
60oC pol 30o 51.7oC
Crystal
SmA
B20Optical Textures
56.2oC59.3oC
Crystal