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Kenji Ema
Tokyo Institute of Technology
PhysicsLiquid crystalPhase transitionCondensed matter physicsHeat capacity
99Publications
17H-index
1,150Citations
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Publications 97
Newest
#1Satoshi AyaH-Index: 9
#2Yuji SasakiH-Index: 7
Last. Fumito AraokaH-Index: 27
view all 8 authors...
Surface-specific liquid crystal (LC) nanostructures provide a unique platform for studying surface-wetting phenomena and also for technological applications. The most important studies on LC properties are related to bulk alignment, surface anchoring, and so on. Here, we study an LC system with a nematic liquid crystal (NLC) on a perfluoropolymer-coated substrate, in which a discontinuous bulk orientational transition has recently been found. Using free-energy analysis based on experimental resu...
4 CitationsSource
#1Cheng-Cher Huang (UMN: University of Minnesota)H-Index: 28
#2Shun Wang (UMN: University of Minnesota)H-Index: 8
Last. Ron Pindak (BNL: Brookhaven National Laboratory)H-Index: 10
view all 9 authors...
For more than one decade, were the only three confirmed commensurate SmC* variant phases with periodicities less than or equal four layers. In 2006, employing ellipsometry and resonant X-ray diffraction (RXRD), our research team first discovered a new liquid crystal mesophase having a six-layer periodicity in one ternary mixture which includes one sulfur-containing compound. From our ellipsometric results, this phase showed antiferroelectric-like optical response. This novel discovery inspired r...
4 CitationsSource
#1Yoichi TakanishiH-Index: 37
#2Haruhiko YaoH-Index: 13
Last. Atsuo IidaH-Index: 16
view all 9 authors...
We analyzed the local nanostructure in binary mixtures of rod- and bent-shaped molecules, n-pentyl-4-cyanobiphenyl (5CB) and 1,3-phenylene bis[4-(4-n-octyloxyphenyliminomethyl) benzoates] (P-8-OPIMB), respectively, using small- and wide-angle X-ray microbeam and macrobeam scattering. From the orientational X-ray scattering patterns, we concluded that the nematic director of 5CB is almost parallel to the smectic layers dominated by bent-core molecules in Bx. Moreover, we observed oriented small-a...
14 CitationsSource
#1Satoshi Aya (TITech: Tokyo Institute of Technology)H-Index: 9
#2Anna Zep (University of Warsaw)H-Index: 9
Last. Hideo Takezoe (TITech: Tokyo Institute of Technology)H-Index: 60
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We report that an asymmetric bent dimer, consisting of a rod mesogen and a cholesterol mesogen linked by a flexible spacer with 9 carbon atoms, was found to form blue phases with a record-wide temperature range. Moreover, highly stable, fast electro-optic switching is possible. In addition to the stable Kerr effect, the electrostriction effect was also observed.
17 CitationsSource
#1Satoshi AyaH-Index: 9
#2Yuji SasakiH-Index: 7
Last. Hideo TakezoeH-Index: 10
view all 10 authors...
3 CitationsSource
#1Kenji Aihara (TITech: Tokyo Institute of Technology)H-Index: 4
#2Yuji Sasaki (Hokkaido University)H-Index: 7
Last. Kenji Ema (TITech: Tokyo Institute of Technology)H-Index: 17
view all 3 authors...
Precise heat-capacity measurements have been made around the smectic-–smectic- phase transition in the R–S mixture of liquid crystal MHPOBC ([1,1′-biphenyl]-4-carboxylic acid, 4′-(octyloxy)-, 4-[[(1-methylheptyl)oxy]carbonyl]phenyl ester) which exhibits ferro- and antiferroelectric phases. Ultra-low frequency ac calorimeter and high-sensitivity differential scanning calorimeter have been used. The measurements revealed the existence of quite slow relaxation near the transition. The heat-capacity...
3 CitationsSource
#2Kenji AiharaH-Index: 4
Last. Kenji EmaH-Index: 17
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#1Junko MorikawaH-Index: 16
#2Toshimasa HashimotoH-Index: 16
Last. Hideo TakezoeH-Index: 10
view all 6 authors...
4 CitationsSource
#1Anna Zep (University of Warsaw)H-Index: 9
#2Satoshi Aya (TITech: Tokyo Institute of Technology)H-Index: 9
Last. Ewa Gorecka (University of Warsaw)H-Index: 31
view all 9 authors...
A sequence of seven nematic phases has been observed in chiral mesogenic dimers, having odd number of carbon atoms in the spacer, thus a bent shape. The highest temperature phase is a chiral nematic (cholesteric) phase on heating or blue phases on cooling. The lowest temperature nematic phase expels the chiral twist and exhibits spontaneous bent–splay modulation.
32 CitationsSource
#1Yuji Sasaki (TITech: Tokyo Institute of Technology)H-Index: 7
#2Khoa V. Le (TITech: Tokyo Institute of Technology)H-Index: 13
Last. Kenji Ema (TITech: Tokyo Institute of Technology)H-Index: 17
view all 8 authors...
4 CitationsSource
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