Abrupt Interfacial Transitions of Hydrophobic Polysilanes As Probed via Liquid Crystal-Assisted Stepwise Deposition

Nagano, Shusaku; Seki, Takahiro

doi:10.1021/ja012105n

Cited by 22 publications

(13 citation statements)

References 29 publications

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“…Layer-bylayer transfer of the monolayer onto a substrate further leads to valuable information on the conformational behavior of the polymer. 57 Although this knowledge gives new implications in polymer nano-processing, details are not described here because this topic is somewhat deviated from the framework of this article.…”

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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“…Moreover, molecular integration at the interface occasionally gives characteristic molecular assemblies that are different from those formed in the bulk states due to the 2D confinement effects. [45][46][47][48][49] Recently, we reported monolayer behaviour of bolaamphiphile 1 with a biphenyl core and flexible trisiloxane spacers (Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

Organised structures of flexible bolaamphiphiles with trisiloxane spacers: three- and two-dimensional molecular assemblies with different molecular conformation

Mizoshita

Seki

2006

Soft Matter

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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: 94%

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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Abrupt Interfacial Transitions of Hydrophobic Polysilanes As Probed via Liquid Crystal-Assisted Stepwise Deposition

Cited by 22 publications

References 29 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

Organised structures of flexible bolaamphiphiles with trisiloxane spacers: three- and two-dimensional molecular assemblies with different molecular conformation

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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