Advanced Materials

doi: 10.1002/adma.201470071pmid: N/A

Cao, Changyong; Chan, Hon Fai; Zang, Jianfeng; Leong, Kam W.; Zhao, Xuanhe

doi: 10.1002/adma.201470068pmid: N/A

A simple yet effective method, described on page 1763 by X. Zhao and co‐workers, to generate high‐aspect‐ratio, hierarchical, and dynamically tunable topographical patterns over large areas by harnessing the localized‐ridge instability in nanofilms. The new patterns have led to extraordinary functions, including extremely stretchable super‐hydrophobic coatings and biomimetic cell‐culture substrates capable of controlled stem‐cell alignment on demand.

Lee, Wi Hyoung; Choi, Hyun Ho; Kim, Do Hwan; Cho, Kilwon

doi: 10.1002/adma.201470069pmid: N/A

Recent studies of the bias‐stress‐driven electrical instability of organic field‐effect transistors are reviewed by K. Cho, D. H. Kim, and co‐workers on page 1660. The principles underlying the bias instability are discussed, particularly the mechanisms of charge trapping. The charge‐trapping phenomena in the semiconductor, the dielectric, and the semiconductor‐dielectric interface are analyzed with special attention to the microstructural dependence of bias instability.

doi: 10.1002/adma.201470070pmid: N/A

Boekhoven, Job; Stupp, Samuel I.

doi: 10.1002/adma.201304606pmid: 24496667

In supramolecular materials, molecular building blocks are designed to interact with one another via non‐covalent interactions in order to create function. This offers the opportunity to create structures similar to those found in living systems that combine order and dynamics through the reversibility of intermolecular bonds. For regenerative medicine there is a great need to develop materials that signal cells effectively, deliver or bind bioactive agents in vivo at controlled rates, have highly tunable mechanical properties, but at the same time, can biodegrade safely and rapidly after fulfilling their function. These requirements make supramolecular materials a great platform to develop regenerative therapies. This review illustrates the emerging science of these materials and their use in a number of applications for regenerative medicine.

Lee, Wi Hyoung; Choi, Hyun Ho; Kim, Do Hwan; Cho, Kilwon

doi: 10.1002/adma.201304665pmid: 24677491

Recent studies of the bias‐stress‐driven electrical instability of organic field‐effect transistors (OFETs) are reviewed. OFETs are operated under continuous gate and source/drain biases and these bias stresses degrade device performance. The principles underlying this bias instability are discussed, particularly the mechanisms of charge trapping. There are three main charge‐trapping sites: the semiconductor, the dielectric, and the semiconductor‐dielectric interface. The charge‐trapping phenomena in these three regions are analyzed with special attention to the microstructural dependence of bias instability. Finally, possibilities for future research in this field are presented. This critical review aims to enhance our insight into bias‐stress‐induced charge trapping in OFETs with the aim of minimizing operational instability.

Zlotnikov, Igor; Werner, Peter; Blumtritt, Horst; Graff, Andreas; Dauphin, Yannicke; Zolotoyabko, Emil; Fratzl, Peter

doi: 10.1002/adma.201470072pmid: N/A

The discovery of a perfectly ordered 3D mesoporous protein/silica structure in the axial filament of the marine sponge Monorhaphis chuni is reported by I. Zlotnikov and co‐workers on page 1682. The structure belongs to a body‐centered tetragonal symmetry system and comprises interconnecting lattices of protein (red) and silica (green), templated by the self‐assembled, enzymatically active protein silicatein, whose primary function is the precipitation of silica.

Zlotnikov, Igor; Werner, Peter; Blumtritt, Horst; Graff, Andreas; Dauphin, Yannicke; Zolotoyabko, Emil; Fratzl, Peter

doi: 10.1002/adma.201304696pmid: 24338871

The discovery of perfectly ordered 3D mesoporous protein/silica structure in the axial filament of the marine sponge Monorhaphis chuni is reported. The structure belongs to body‐centered tetragonal symmetry system (a = 9.88 nm, c = 10.83 nm) and comprises interconnecting lattices of protein and silica, templated by the self‐assembled, enzymatically active protein‐silicatein, whose primary function is the precipitation of silica.

Musumeci, Chiara; Zappalà, Gabriella; Martsinovich, Natalia; Orgiu, Emanuele; Schuster, Swen; Quici, Silvio; Zharnikov, Michael; Troisi, Alessandro; Licciardello, Antonino; Samorì, Paolo

doi: 10.1002/adma.201304848pmid: 24343948

Fang, Xin; Yang, Zhibin; Qiu, Longbin; Sun, Hao; Pan, Shaowu; Deng, Jue; Luo, Yongfeng; Peng, Huisheng

doi: 10.1002/adma.201305241pmid: 24347052

A novel core‐sheath carbon nanostructured fiber is created with high tensile strength, electrical conductivity, and electrocatalytic activity. In particular, the designed ribbon‐like nanostructure on the outer surface favors the attachment and impregnation of a second functional phase that is critical for electronic devices. As a demonstration, novel wire‐shaped dye‐sensitized solar cells are produced with high energy conversion efficiencies up to 6.83%.