A Morphological Study on the Changes in Texture of the -containing LB Films Induced by Hydrothermal Treatments

Hasegawa, Shoukaku; Moshino, Hiroko; Mouri, Syuji; Miura, Yasühiro; Sugi, Michio

doi:10.14723/tmrsj.32.309

Cited by 3 publications

(15 citation statements)

References 8 publications

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“…Round-shaped domains are observed both by BF microscopy and FL microscopy and the domain sizes are reaching 100 μm in diameter. In our previous works, due to insufficient color sensitivity and the resolution limit of the BF microscope, microstructures of the domains were not characterized sufficiently [ 18 , 20 - 25 ]. However, from Figure 6 a in the present work, it has been found that the bluish areas tend to be observed in round-shaped domains compared to areas outside.…”

Section: Resultsmentioning

confidence: 99%

“…We have also reported that the HTT process induces a unique superstructure in the MS-C 20 binary LB systems [ 18 , 20 - 25 ]. Giant round-shaped domains with diameters reaching 100 μm are observed by optical microscopy.…”

Section: Introductionmentioning

confidence: 99%

“…In those papers, we have touched upon the sizes of the round-shaped domains depending on heating temperature ( T H ) and heating time ( t H ) and found that the average size of the domains tends to increase superlinearly depending on T H and t H . However, due to insufficient color sensitivity and resolution of the optical microscope used for the observation, the surface structure had not been characterized in detail [ 18 , 20 - 25 ].…”

Section: Introductionmentioning

confidence: 99%

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Generation of disk-like domains with nanometer scale thickness in merocyanine dye LB film induced by hydrothermal treatment

2013

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We have characterized the binary LB films of merocyanine dye (MS) and arachidic acid (C20) before and after hydrothermal treatment (HTT), which is defined as a heat treatment under relative humidity of 100%, focusing on the morphology studied by bright field (BF) microscopy and fluorescence (FL) microscopy. BF microscopy observation has revealed that the as-deposited MS-C20 binary LB film is found to emit intense red fluorescence over the whole film area by 540-nm excitation. Since the surface image is almost featureless, it is considered that the crystallite sizes of J-aggregate are less than 10 μm. Interestingly, after HTT, round-shaped domains are observed in the LB systems, and the sizes are reaching 100 μm in diameter. Crystallites of J-aggregate, which are bluish in color and emit intense red fluorescence, tend to be in the round domains. We have observed two different types of domains, i.e., blue-rimmed domains and white-rimmed domains, which are postulated to be confined in the inner layers and located at the outermost layer, respectively. The thickness of the domains is equal to or less than that of the double layer of the MS-C20 mixed LB film, which is ca. 5.52 nm. The molecular order of MS in the J-aggregate is improved by the HTT process leading to the significant sharpening of the band shape together with the further red shift of the band (from 590 to 594 nm up to 597 to 599 nm). The reorganized J-band is considered to be ‘apparently’ isotropic owing to the random growth of the J-aggregate in the film plane. We consider that the lubrication effect by the presence of water molecules predominates in the HTT process.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Generation of disk-like domains with nanometer scale thickness in merocyanine dye LB film induced by hydrothermal treatment

2013

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“…9,11) Recently, we have found that hydrothermal treatments (HTTs) under 100% relative humidity are effective for modifying the original aggregation state. [16][17][18][19][20][21][22][23][24][25] The asdeposited J-band is reorganized by HTT to form a new phase associated with a narrowing and a slight redshift of the peak. The associated change in the absorbance spectrum involves two different stages.…”

Section: Introductionmentioning

confidence: 99%

“…As the HTT process proceeds, round-shaped superstructures, each one monolayer thick, can be observed under a microscope to grow up to $0:1 mm in diameter or more. 16,[20][21][22] X-ray diffraction measurements have shown that AT introduces disorders in the Cd 2þ ion lattice at each hydrophilic interface between adjacent monolayers, and that DHT and HTT, in contrast, enhance the degree of ordering of the Cd 2þ ion lattice. 9,16,22) Furthermore, it has been preliminarily shown that the HTT-induced J-band is much more thermally stable than the original J-band in the as-deposited state.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of Thermal Dissociation–Restoration Processes of J-Aggregate

Moshino

Koyano

Mouri

et al. 2009

jjap

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GaN etching damage characteristics by capacitively coupled radio frequency Kr and Ar plasmas have been found to differ significantly, on the basis of experimental and simulation results. The morphology of a GaN surface etched by Kr plasma is as smooth as that of the asgrown surface, and is independent of gas pressure and etching time. The agreement between the experimental and simulated etching depths for the Kr plasma, which are lower than those for the Ar plasma, indicates a significant contribution to the GaN damage of the physical etching effect. In contrast, Ar plasma etching produces a rough surface, which is dependent on gas pressure and etching time, and appears to be due to a chemical effect. The difference in the GaN surface morphologies etched by the Kr and Ar plasmas may be attributed to the different depths etched for these two plasmas. Moreover, the simulation shows that, for the Kr plasma, Ga is preferentially etched from GaN, whereas the preferential etching of N occurs for the Ar plasma. The difference in preferential etching between the Kr and Ar plasmas may be related to the difference between the GaN surface morphologies etched by these two plasmas.

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Kinetics of Hydrothermally Induced Reorganization of J-Aggregate

Moshino¹,

Hasegawa²,

Mouri³

et al. 2008

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Using the symplectic formalism of classical mechanics, a smooth holonomy effect is identified in a special class of classical ergodic Hamiltonian systems (generalized canonical families) that are cycled adiabatically. It is a smooth shift in a time-resembling observable 'tempus' that is canonically conjugated to the phase space volume contained in the energy shell. The curvature 2-form of the adiabatic connection obtained is closely related to Hannay's and the Robbins-Berry 2-form. The measurability of the 'tempus' is discussed.

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A Morphological Study on the Changes in Texture of the -containing LB Films Induced by Hydrothermal Treatments

Cited by 3 publications

References 8 publications

Generation of disk-like domains with nanometer scale thickness in merocyanine dye LB film induced by hydrothermal treatment

Generation of disk-like domains with nanometer scale thickness in merocyanine dye LB film induced by hydrothermal treatment

Kinetics of Thermal Dissociation–Restoration Processes of J-Aggregate

Kinetics of Hydrothermally Induced Reorganization of J-Aggregate

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