Creation Of Wrinkles Research Articles

Homogeneous Lateral Lithium Intercalation into Transition Metal Dichalcogenides via Ion Backgating.

Lithium intercalation has become a versatile tool for realizing emergent quantum phenomena in two-dimensional (2D) materials. However, the insertion of lithium ions may be accompanied by the creation of wrinkles and cracks, which prevents the material from manifesting its intrinsic properties under substantial charge injection. By using the recently developed ion backgating technique, we successfully realize lateral intercalation in 1T-TiSe2 and 2H-NbSe2, which shows substantially improved sample homogeneity. The homogeneity at high lithium doping is not only demonstrated via low-temperature transport measurements but also directly visualized by topographical imaging through in situ atomic force microscopy (AFM). The application of lateral intercalation to a broad spectrum of 2D materials can greatly facilitate the search for exotic quantum phenomena.

Metal‐Free Growth of Nanographene on Silicon Oxides for Transparent Conducting Applications

AbstractConventional methods to prepare large‐area graphene for transparent conducting electrodes involve the wet etching of the metal catalyst and the transfer of the graphene film, which can degrade the film through the creation of wrinkles, cracks, or tears. The resulting films may also be obscured by residual metal impurities and polymer contaminants. Here, it is shown that direct growth of large‐area flat nanographene films on silica can be achieved at low temperature (400 °C) by chemical vapor deposition without the use of metal catalysts. Raman spectroscopy and TEM confirm the formation of a hexagonal atomic network of sp2‐bonded carbon with a domain size of about 3–5 nm. Further spectroscopic analysis reveals the formation of SiC between the nanographene and SiO2, indicating that SiC acts as a catalyst. The optical transmittance of the graphene films is comparable with transferred CVD graphene grown on Cu foils. Despite the fact that the electrical conductivity is an order of magnitude lower than CVD graphene grown on metals, the sheet resistance remains 1–2 orders of magnitude better than well‐reduced graphene oxides.

High aspect ratio wrinkles on a soft polymer

Instability of a stiff thin film attached to a compliant substrate often leads to the emergence of exquisite wrinkles with length scales that depend on the system geometry and applied stresses. These patterns have vast potential applications including in tissue engineering, flexible electronics and the semiconductor industry. However, one of the limiting factors in the usage of these patterns is the low amplitude/wavelength ratio that can be achieved using the current surface engineering techniques. Here, we present an effective method that allows the creation of wrinkles with an amplitude/wavelength aspect ratio as large as 2.5 on a soft polymer. In this method, first, the surface of a poly(dimethylsiloxane) (PDMS) is pre-patterned using an Ar ion beam. Then, an amorphous carbon film gets deposited on the pre-patterned polymeric surface using glancing angle deposition (GLAD). We show that the amplitude of the created patterns can be varied between several nm to submicron size by changing the carbon deposition time, allowing us to harness patterned polymeric substrates for a variety of applications. Specifically, we demonstrate a potential application of the high aspect ratio wrinkles for changing the surface optical band gap.

1202 ウェブ搬送時のしわ発生予測モデル : 第1報,実験(要旨講演,柔軟媒体ハンドリング/画像形成機器)

In the transportation system for continuous flexible materials such as paper, plastic film, metal foil, textile, most webs are very thin and consequently easy to buckle or wrinkle. Especially, in the case of paper-web, the creation of wrinkles is more often as compared with the case of plastic film or metal foil. The web wrinkling affects significantly the product quality and sometimes it leads to less profitability in the manufacturing operation. The paper-web wrinkles treated in this paper are caused by the roller misalignment and traction characteristics between web and roller in the transportation systems. The prediction model of paper-web wrinkles is formulated and some numerical calculation results are shown with experimental verifications for coated and uncoated paper-webs. Moreover, the idea of "web defect map" is presented for designing and safety operating the web transportation system.

1204 ウェブ搬送時のしわ発生予測モデル : 第3報,ウェブ損傷図(要旨講演,柔軟媒体ハンドリング/画像形成機器)

In the transportation system for continuous flexible materials such as paper, plastic film, metal foil, textile, most webs are very thin and consequently easy to buckle or wrinkle. Especially, in the case of paper-web, the creation of wrinkles is more often as compared with the case of plastic film or metal foil. The web wrinkling affects significantly the product quality and sometimes it leads to less profitability in the manufacturing operation. The paper-web wrinkles treated in this paper are caused by the roller misalignment and traction characteristics between web and roller in the transportation systems. The prediction model of paper-web wrinkles is formulated and some numerical calculation results are shown with experimental verifications for coated and uncoated paper-webs. Moreover, the idea of "web defect map" is presented for designing and safety operating the web transportation system.

REJUVENATION OF THE PERIORAL AREA

Lip aging is characterized by a relaxation of the skin with creation of wrinkles and vermilion involution. Surgical techniques include skin excisions and vermilion reposition.