Monolayer Formation of Hydrophobic Polysilane on Water through Hybridization with Liquid Crystal Molecules

Nagano, Shusaku; Seki, Takahiro; Ichimura, Kunihiro

doi:10.1021/la001469a

Cited by 18 publications

(7 citation statements)

References 38 publications

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“…55,56 When a mixed solution of PDHS and 5CB is spread onto a water surface, an ideally extended monolayer of PDHS is spontaneously formed on 5CB monolayer. The monolayer of PDHS can be prepared on water despite the fact that the polymer is fully hydrophobic.…”

Section: Photocontrol Of Two Dimensional Phase Separationmentioning

confidence: 99%

Dynamic Photoresponsive Functions in Organized Layer Systems Comprised of Azobenzene-containing Polymers

Seki

2004

Polym J

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ABSTRACT:Azobenzene (Az)-containing polymers provide fascinating photoresponsive actuation systems. When they are organized at interfaces, the motion of Az unit occurring at a molecular (sub-nano) scale can be transferred and amplified to larger scales of materials. This review article focuses to selected research topics on organized layer systems of Az-containing polymers proceeding in our laboratory. They involve i) photomechanical response of monolayers at nanometer levels in thickness and centimeters in area, ii) monolayer-mediated photoorientation of polymer (polysilane) and mesoporous silica at nano-to sub-micrometer levels in thickness, and iii) instant mass migration triggered by patterned photoirradiation occurring at distances over micrometer levels. In every system, strong cooperative interplays between the Az unit and organized molecular or macromolecular assemblies play the essential roles. Promotions of these research areas are anticipated to provide wide and new opportunities for material processing and creation of new classes of photofuncitional soft materials.

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Section: Photocontrol Of Two Dimensional Phase Separationmentioning

confidence: 99%

Dynamic Photoresponsive Functions in Organized Layer Systems Comprised of Azobenzene-containing Polymers

Seki

2004

Polym J

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“…No all-trans-zigzag conformation is observed when the film thickness becomes below approximately 10 nm. Nagano and Seki , prepared built-up Langmuir–Blodgett (LB) films consisting of PDHS via cospreading with 4′-pentylcyanobiphenyl (5CB) on water. Stepwise depositions of the monolayered PDMS demonstrated that the helical gauche conformation near the substrate abruptly changes to the all-trans-zigzag one at a specific deposition number corresponding to the same thickness …”

Section: Introductionmentioning

confidence: 99%

Evaluations of Mesogen Orientation in Thin Films of Polyacrylate with Cyanobiphenyl Side Chain

Tanaka¹,

Mizuno²,

Hara³

et al. 2016

Langmuir

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The orientation behavior of mesogens in a polyacrylate with cyanobiphenyl (CB) side chain in thin films was investigated in detail by UV-vis absorption spectroscopy and grazing incidence small-angle X-ray scattering (GI-SAXS) measurements using both high-energy X-rays of Cu Kα line (λ = 0.154 nm) and low-energy synchrotron X-rays (λ = 0.539 nm). By changing the film thickness ranging 7-200 nm, it is concluded that the planar orientation is predominant for thin films with thickness below 10-15 nm. This planar mesogen orientation near the substrate surface coexists with the homeotropically aligned CB mesogens in films thicker than 30 nm. For the thinnest 7 nm film, the planar orientation is unexpectedly lost, which is in consort with a disordering of smectic layer structure. Peculiar orienting characteristics of CB mesogen are suggested, which probably stem from the tendency to form an antiparallel arrangement of mesogens due to the strong dipole moment of the terminal cyano group.

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“…Because of this unique property, the application of polysilane for ordered materials in the nanometer scale is an interesting theme both scientifically and technologically [15][16][17]. In our previous study, we found that radiation-modified polysilane forms nanoscale micelles in selective solvents [18,19].…”

Section: Introductionmentioning

confidence: 93%

Effect of the graft chain length and density on the morphology of radiation-modified polysilane monolayers at the air/water interface

Tanaka

Kunai

Sato

et al. 2011

Journal of Colloid and Interface Science

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The variation in the morphology of monolayers at the air/water interface is investigated for two kinds of radiation-modified polysilanes with different structures: poly(diethyl fumarate)-grafted poly(methyl-n-propylsilane) (PMPrS-g-PDEF) and maleic anhydride-grafted PMPrS (PMPrS-g-MAH). PMPrS-g-PDEF has long but sparsely-attached PDEF graft chains, while PMPrS-g-MAH has short but densely-attached MAH graft units. Surface pressure-area measurements indicate that PMPrS-g-PDEF monolayers extensively spread at the air/water interface though PMPrS homopolymer hardly spreads. AFM observation reveals that PMPrS-g-PDEF monolayers have an inhomogeneous structure containing string-like microstructures. This result suggests that PMPrS main chains are detached from the water surface to aggregate together and only PDEF chains spread over the water surface. In contrast, PMPrS-g-MAH forms uniform monolayers with a smooth surface. PMPrS main chains of PMPrS-g-MAH are anchored to the water surface by densely grafted MAH units. It is also demonstrated that only the PMPrS-g-MAH monolayers are successfully deposited layer-by-layer on a solid substrate by the Y-type deposition.

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Monolayer Formation of Hydrophobic Polysilane on Water through Hybridization with Liquid Crystal Molecules

Cited by 18 publications

References 38 publications

Dynamic Photoresponsive Functions in Organized Layer Systems Comprised of Azobenzene-containing Polymers

Dynamic Photoresponsive Functions in Organized Layer Systems Comprised of Azobenzene-containing Polymers

Evaluations of Mesogen Orientation in Thin Films of Polyacrylate with Cyanobiphenyl Side Chain

Effect of the graft chain length and density on the morphology of radiation-modified polysilane monolayers at the air/water interface

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