very high saturation fields, similar to the parent powders. This implies that these submicrometer laminated cores can be used in high-power applications where excitation fields are large.In conclusion, we have successfully fabricated Fe/SiO 2 submicrometer laminates that have lateral dimensions of a few to several hundred micrometers and submicrometer thicknesses. The sheet structure is retained during the consolidation, giving rise to laminated soft Fe cores. High-frequency measurements show that the maximum operating frequency can be increased to about 50 MHz, a more than two orders of magnitude improvement over the parent commercial powders. We ascribe these observations to the combination of submicrometer-scale lamination and the silica coating which effectively prevents eddy-current power loss at high frequencies.

Wettability of solid surfaces with liquids is governed by the chemical properties and the microstructure of the surfaces. As far as the microstructure of a surface is concerned, fine roughness is well-known to enhance the hydrophobic and hydrophilic properties. 1,2 A hydrophobic surface, in which the contact angle for water is enhanced by small roughness and is larger than about 150°, is called "superhydrophobic," and a hydrophilic surface, in which the contact angle is similarly enhanced by small roughness and is less than 5°, is called "superhydrophilic." Very recently, we have succeeded in forming transparent, superhydrophobic coating films on glass plates through the sol-gel method by the combination of microstructural and chemical approaches. 3,4 Alumina thin films with roughnesses of less than 50 nm were formed by immersing the porous alumina gel films in boiling water, and we named this the "flowerlike structure." Coating of hydrolyzed fluoroalkylsilane (FAS) on this flowerlike Al 2 O 3 produced the superhydrophobic surface; the contact angle for water was about 165°. The roughness led to the extremely high water repellency. We also reported that the contact angle for water of the surface was drastically decreased with heat treatment at temperatures higher than 500°C because of thermal decomposition of the fluoroalkyl chain in FAS. 5 On the other hand, patterning of a surface into regions of different surface free energies using selfassembled monolayers has been reported. [6][7][8][9][10][11] This pattern is, for example, applied to selective deposition of tantalum oxide thin film. 10 However, these studies have focused on the control of the chemical properties of surfaces with self-assembled monolayers, and the difference of the contact angle for water is smaller than 90°; this may limit practical applications of the hydrophobic-hydrophilic patterns. It has also been reported that hydrophobic character of a super-water-repellent surface can be changed by UV irradiation through photoisomerization of an organic compound; however, the difference of contact angle for water is around 80°. 12,13 UV irradiation on TiO 2 surfaces has been also reported to induce the change in contact angle from 72°t o 0°. 14 However, the hydrophilic surface becomes hydrophobic again with storage.In the present paper, we demonstrate the conversion of a superhydrophobic into a superhydrophilic surface by UV irradiation, where the hydrophobic and hydrophilic properties are enhanced by a fine roughness. The formation of superhydrophobic-superhydrophilic micropatterns is also reported by the application of this conversion technique.Schematic representation for the formation of superhydrophobic-superhydrophilic patterns is shown in Figure 1. First, the alumina thin films (about 200 nm thick) with roughness of less than 50 nm were prepared using aluminum tri-sec-butoxide, isopropyl alcohol, ethyl acetoacetate, and water, as reported previously. [3][4][5] The coating was carried out on soda lime glass plates in a dipping-withdrawing ma...

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h i g h l i g h t sLi 6 PS 5 Cl solid electrolyte was prepared from ethanol solution. LiCoO 2 was coated with Li 6 PS 5 Cl solid electrolyte by using the solution. All-solid-state batteries using the electrolyte-coated LiCoO 2 operated reversibly. battery Lithium secondary battery Sulfide solid electrolyte Liquid phase method a b s t r a c t A Li 6 PS 5 Cl solid electrolyte was successfully prepared by dissolution-reprecipitation process via ethanol solution. An ionic conductivity of the Li 6 PS 5 Cl solid electrolyte from the homogeneous ethanol solution was 1.4 Â 10 À5 S cm À1 at room temperature. LiCoO 2 particles were coated with the Li 6 PS 5 Cl electrolyte via ethanol solution to form favorable electrode-electrolyte interface with a large contact areas. An allsolid-state cell using the electrolyte-coated LiCoO 2 operated as a rechargeable battery and showed the initial discharge capacity of 45 mAh g À1 at 25 C.

BiCh2-based compounds (Ch: S, Se) are a new series of layered superconductors, and the mechanisms for the emergence of superconductivity in these materials have not yet been elucidated. In this study, we investigate the relationship between crystal structure and superconducting properties of the BiCh2-based superconductor family, specifically, optimally doped Ce1−xNdxO0.5F0.5BiS2 and LaO0.5F0.5Bi(S1−ySey)2. We use powder synchrotron X-ray diffraction to determine the crystal structures. We show that the structure parameter essential for the emergence of bulk superconductivity in both systems is the in-plane chemical pressure, rather than Bi-Ch bond lengths or in-plane Ch-Bi-Ch bond angle. Furthermore, we show that the superconducting transition temperature for all REO0.5F0.5BiCh2 superconductors can be determined from the in-plane chemical pressure.

We have prepared transparent, super‐water‐repellent coating films of alumina on glass plates by a combination of geometric and chemical approaches. The contact angle for water in the films was 165° and the transmittance for visible light was higher than 92%. A roughness of 20 to 50 nm was obtained, which is too small to scatter visible light, while the degree of roughness was great enough to enhance the water‐repellent properties together with the chemical effect of a fluorine‐containing agent and gave a super‐water‐repellent surface. The coatings have great potential for practical applications such as eyeglasses, cover glasses for solar cells, windshields of automobiles, and so on.