The structural blue color of a Morpho butterfly originates from the diffraction light and interference effects due to presence microstructures on wing butterfly. Structural surface damselfish reversibly changes between green blue. Inspired by these creatures, we have been trying prepare high-quality functional films. We describe our efforts in this Account. A useful technique such films colloidal solution is "lifting" method, which allows us quickly fabricate brilliant crystal thicknesses...

Atomically flat two-dimensional networks of boron are attracting attention as post-graphene materials. An introduction cations between the atomic layers can exhibit unique electronic functions that not achieved by neutral graphene or its derivatives. In present study, we propose a synthesis strategy for ion-laminated layered materials in solution phase, which enables preparation analogs changing alkali-metal species. The large extends thermal range liquid-crystal phases because weakened...

Composite materials comprised of nematic liquid crystals (LCs) and SiO(2) inverse opal films were fabricated. Their optical properties quite different from those without the LCs. The could be controlled by changing refractive indices LCs, which vary with orientation, phase, temperature. In particular, drastically changed thermal or photoinduced isothermal phase transitions This means that photonic band structure controlled, tunable have been achieved, based on structure. mechanism this...

Alkanethiol-capped gold nanoparticles dispersed in n-dodecane were studied by spectroscopic ellipsometry and modeled using Mie scattering theory. The refractive index the visible near-infrared depended on volume fraction of nanoparticles, good agreement with theoretical expectation that such plasmonic can act as low or tunable materials at specific optical wavelengths.

We present a simple way to control the photoinduced bending direction of azobenzene-containing cross-linked liquid-crystalline polymers. By changing location photoactive azobenzene moieties from cross-links side-chains, sample is reversed under identical irradiation conditions. In addition providing versatile route toward directionality macroscopic motions, this observation highlights complicated nature photomechanical response polymers, showing that photomobile behavior can be determined by...

Recently, photonic band gap (PBG) crystals with lattice parameters comparable to the wavelength of light have attracted much attention, because they offer unique ways in which control propagation light. PBG applications laser, quantum optical devices, and so on. For many these applications, it is important capability tuning structures. The fabrication such tunable still a challenge. In this paper, we proposed that switchable could be realized by taking advantage phase transition liquid...

FeCo Prussian blue analogues, which are known as typical molecule-based magnets, exhibited abrupt conductance switching by applying a high electric field well varying the temperature. The current density versus (J-E) curves of with Rb cations in interstitial sites shows so-called negative resistance effects at fields higher than threshold voltage. This means that analogues multiproperty materials sense their conducting, magnetic, and optical properties can be reversibly controlled certain...

Tunable photonic band gap crystals were prepared by the infiltration of photoresponsive liquid into inverse opal structure films. Tuning their optical properties could be realized means photoinduced phase transition crystals. The behavior evaluated measuring change in under light irradiation, and it was clearly observed that varied with temperature intensity. materials store display images created irradiation UV through a photomask. A great advantage this technique is films themselves can an...

A method was developed to continuously adjust the position of stop band inverse opal by controlling refractive index. The films were fabricated using a coassembly monodispersed polystyrene spheres and nanoparticles silica titania from aqueous suspensions followed calcination treatment. Varying ratio in gave ability finely indices, which as result changed band.

Immobilized gold nanoparticles on a three-dimensionally ordered macroporous (3DOM) film were prepared by dipping method. The localized surface plasmon resonance of the and stop-band 3DOM film, both still evident after immobilization, are dependent refractive index surrounding medium. picture shows before (left) (right) coating with nanoparticles. Much work has been devoted to developing sensors from silver suspended in solution.9, 10 In some cases, it is necessary immobilize substrate...

Well-dispersed 1−6 nm diameter gold nanoparticles were intercalated into the interlayer galleries of lamellar oxides by first intercalating with poly(allylamine) (PAA) or poly(diallyldimethylammonium) ions to invert layer charge. This reaction was demonstrated for an exfoliated fluoromica as well a Dion−Jacobson phase perovskite (HCa2Nb3O10). In PAA case, very little aggregation. Larger (3−6 diameter) could also be intercalated, but some aggregates observed on outer surface host solids. FTIR...

Abstract Borophene has been recently proposed as a next-generation two-dimensional material with promising electronic and optical properties. However, its instability thus far limited large-scale applications. Here, we investigate liquid-state borophene analogue an ordered layer structure derived from oxide. The structure, phase transition features basic properties are revealed by using X-ray analysis, electron microscopy, thermal characterization. obtained liquid crystal exhibits high...

Precise control of the surface topographies polymer materials is key to developing high-performance and devices for a wide variety applications, such as optical displays, micro/nanofabrication, photonic devices, microscale actuators. In particular, photocontrolled surfaces, photoinduced relief, have been extensively studied mainly through photochemical mass transport. this study, we propose novel method triggering transport by photopolymerization liquid crystals with structured light...

The precise alignment control of polymer main chains and liquid crystals (LCs) is effective for fabricating high-performance functional coatings. Conventionally, chain regulated by mechanical stretching or flow fields; however, these approaches are inherently limited to one-dimensional alignment. Our recent discovery demonstrates that spatiotemporal photopolymerization using scanning light generates fields, a process termed wave (SWaP). In this study, we explored the potential SWaP achieving...

The synthesis, characterization, and quantitative electronic structure modeling of multi-photon absorption properties a neat liquid L34 (4-propyl 4′-butyl diphenyl acetylene) are reported. is (linearly) transparent in the visible spectrum, but possesses large two-photon (2PA) 2PA-induced singlet triplet excited-state as measured by Z-scan technique non-linear transmission measurements using both picosecond nanosecond pulses. most dominant contributions to intensity-dependent come from...

A dipping technique was developed to coat colloidal crystal films with metals. It found that nanosized metallic particles could be simply immobilized onto the monodisperse spheres in film. As one of application such films, silver-coated were used as surface-enhanced Raman scattering substrates. Very large enhancements observed. In addition, it also enhancement factor varies very little from place on a particular substrate and even different can anticipated substrates will find wide...

Epitaxial thin films of L10-ordered FePt alloys are one the most important materials in magnetic recording and spintronics applications due to their large perpendicular anisotropy (PMA). The key production these required superior properties lies control growth mode films. Further, it is necessary distinguish between effect lattice mismatch surface free energy on because strong correlation. In this study, epitaxial was investigated using MgO, NiO, MgON surfaces with almost same constant...

ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTFabrication of Structured Porous Film by ElectrophoresisZhong-Ze Gu, Sinya Hayami, Syoichi Kubo, Qing-Bo Meng, Yasuaki Einaga, Donald A. Tryk, Akira Fujishima, and Osamu SatoView Author Information Kanagawa Academy Science Technology KSP Building East 412, 3-2-1 Sakado Takatsu-ku, Kawasaki-shi, 213-0012, Japan Department Applied Chemistry School Engineering, The University Tokyo 7-3-1 Hongo, Bunkyo-ku, 113-8565, Cite this: J. Am. Chem. Soc....

We used fluorescence microscopy to show that low adsorption of resin components by a mold surface was necessary for continuous ultraviolet (UV) nanoimprinting, as well generation release energy on detachment cured from template mold. This is because with pollution, fracture demolding occurred at the interface between and surfaces rather than outermost part resin. To achieve we investigated radical photopolymerization behaviors fluorescent UV-curable resins mechanical properties (fracture...

Resin adsorption on fluorinated silica mold surfaces during step-and-repeat ultraviolet nanoimprinting was studied by fluorescent microscopy using a UV-curable resist. The fluorescence intensity indicating resin to the in UV under air atmosphere significantly higher than that condensable gas pentafluoropropane (PFP) atmosphere. larger attributable sticking uncured around trapped bubbles preventing resist from causing acrylate radical photopolymerization and small amount of components...

The effects of external force on polymers have been actively studied for a long time. Initially considered primary factor leading to polymer degradation, it has recently re-evaluated as crucial imparting advanced functionalities polymers. However, the effect mechanical stimuli deliberately applied growing is still unknown. Recently, we developed novel photopolymerization process using spatiotemporal lighting, which causes molecular flow during photopolymerization. In this study, report...

Fluorescence behaviors of chromophores in photonic crystals were studied to investigate the effect band gaps on emission behaviors, leading control excited states chromophores. A polystyrene opal structure was selected as a typical crystal, and fluorescence rhodamine 6G adsorbed that observed. It found spectra strongly modified by structure. The intensity attenuated at wavelengths corresponding stop structure, while it enhanced accompanying strange sharp-pointed peaks edge band. Furthermore,...

Split-ring resonators (SRRs) are attractive owing to the interaction with a magnetic field of incident light. Here, we report fabrication uniform arrays about 360 million Au SRRs line width approximately 50 nm by reactive-monolayer-assisted thermal nanoimprint lithography over 5-mm square area. Furthermore, present an experimental demonstration oscillation free electrons excited at 690 in visible frequency region. The and optical investigation SRR such large areas will facilitate...