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Editor-in-Chief: Jos Lenders, Deputy Editors: James Cook, Duoduo Liang, Babak Mostaghaci, Ekaterina Perets, Lu Shi, Consulting Editor: Esther Levy
Online ISSN:
1521-4095
© Wiley-VCH GmbH, Weinheim
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On the Cover
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Liquid Crystals
A new class of cholesteric phase with local polar order is realized by Fumito Araoka and Hiroya Nishikawa in article number 2101305. In general, the periodicity of the conventional cholesteric liquid crystal corresponds to the half-pitch of the helix, having head-and-tail symmetry in the local nematic director. On the other hand, the newly found polar cholesteric liquid crystal is characterized with a full-pitch periodicity of the helix due to the polar degeneracy in the local nematic director. This delivers some unprecedented properties, such as fast electro-optic response based on the photonic band modulated with polar helix deformation.
A new class of cholesteric phase with local polar order is realized by Fumito Araoka and Hiroya Nishikawa in article number 2101305. In general, the periodicity of the conventional cholesteric liquid crystal corresponds to the half-pitch of the helix, having head-and-tail symmetry in the local nematic director. On the other hand, the newly found polar cholesteric liquid crystal is characterized with a full-pitch periodicity of the helix due to the polar degeneracy in the local nematic director. This delivers some unprecedented properties, such as fast electro-optic response based on the photonic band modulated with polar helix deformation.
3D Printing
In article number 2102153, Khoon S. Lim, Yu Shrike Zhang, and co-workers present a smartphone-enabled Digital Light Processing (DLP) 3D printer based on a smartphone-powered projector and a customized touchscreen smartphone app, featuring portability, modularity, and an easy-to-use interface. Through printing with commercial resins and hydrogel-based (bio)inks, it is applied to the fabrication of medical implants, in situ bioprinting, and integration with 3D object-scanning capability.
In article number 2102153, Khoon S. Lim, Yu Shrike Zhang, and co-workers present a smartphone-enabled Digital Light Processing (DLP) 3D printer based on a smartphone-powered projector and a customized touchscreen smartphone app, featuring portability, modularity, and an easy-to-use interface. Through printing with commercial resins and hydrogel-based (bio)inks, it is applied to the fabrication of medical implants, in situ bioprinting, and integration with 3D object-scanning capability.
Biocompatible Materials
The history of biomaterials began with naturally derived materials such as nacre and animal tissues. Gradually mankind developed more advanced materials such as metals, ceramics, alloys and polymers to yield prosthetics and implants. Flexible and reconfigurable materials such as “CareGum” are slowly changing the current state-of-the-art by yielding flexible human-machine interfaces (e.g., bionic eyes, brain implants, heart patches, and bionic wearables (like the electronic glove developed by Alireza Dolatshahi-Pirouz in article number 2100047)).
The history of biomaterials began with naturally derived materials such as nacre and animal tissues. Gradually mankind developed more advanced materials such as metals, ceramics, alloys and polymers to yield prosthetics and implants. Flexible and reconfigurable materials such as “CareGum” are slowly changing the current state-of-the-art by yielding flexible human-machine interfaces (e.g., bionic eyes, brain implants, heart patches, and bionic wearables (like the electronic glove developed by Alireza Dolatshahi-Pirouz in article number 2100047)).
Respiration Sensors
Triboelectric nanogenerators have been widely adopted for self-powered respiration monitoring owing to their compelling features, including low cost, light weight, biocompatibility, wearing comfort, and high sensitivity to respiration biomarkers. In article number 2101262, Yuanjie Su, Jun Chen, and co-workers describe how physiological respiration behavior and exhaled chemical reagents can be continuously monitored by triboelectric nanogenerators for personalized health care.
Triboelectric nanogenerators have been widely adopted for self-powered respiration monitoring owing to their compelling features, including low cost, light weight, biocompatibility, wearing comfort, and high sensitivity to respiration biomarkers. In article number 2101262, Yuanjie Su, Jun Chen, and co-workers describe how physiological respiration behavior and exhaled chemical reagents can be continuously monitored by triboelectric nanogenerators for personalized health care.
Articles
Research Article
Viscoelasticity and Adhesion Signaling in Biomaterials Control Human Pluripotent Stem Cell Morphogenesis in 3D Culture
- 9 September 2021
Abstract
Organoids derived from human induced pluripotent stem cells (hiPSCs) have tremendous potential for use in regenerative medicine, but it is a challenge to control hiPSC morphogenesis and sustain pluripotency in 3D culture. Using hydrogels for 3D culture of hiPSCs, hydrogel viscoelasticity and adhesion ligand density are shown to regulate growth and lumen formation of hiPSCs while supporting pluripotency.
Research Article
Spin–Charge Interconversion in KTaO3 2D Electron Gases
Luis M. Vicente-Arche, Julien Bréhin, Sara Varotto, Maxen Cosset-Cheneau, Srijani Mallik, Raphaël Salazar, Paul Noël, Diogo C. Vaz, Felix Trier, Suvam Bhattacharya, Anke Sander, Patrick Le Fèvre, François Bertran, Guilhem Saiz, Gerbold Ménard, Nicolas Bergeal, Agnès Barthélémy, Hai Li, Chia-Ching Lin, Dmitri E. Nikonov, Ian A. Young, Julien E. Rault, Laurent Vila, Jean-Philippe Attané, Manuel Bibes,
- 9 September 2021
Abstract
2D electron gases formed by sputtering a thin film of Al onto KTaO3 crystals are used to interconvert charge and spin currents with a high efficiency, thanks to the large Rashba spin–orbit coupling in the electron gas. These results are relevant for the integration of quantum oxide materials into spintronics devices.
Perspective
From Molecules to Frameworks to Superframework Crystals
- 9 September 2021
Abstract
A synthetic approach is presented to build macroscopic structures with the same precision applied in molecular chemistry. Molecules are linked into frameworks, and crystals of frameworks are in turn linked into superframeworks, an escalation of building blocks from molecules to crystals. This strategy is termed augmented reticular chemistry, from where new frontiers of photonics, dynamics, and systems chemistry emerge.
Cover Picture
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Hydrogel Ionic Diodes toward Harvesting Ultralow‐Frequency Mechanical Energy (Adv. Mater. 36/2021)
Yong Zhang, Chang Kyu Jeong, Jianjun Wang, Xin Chen, Kyoung Hwan Choi, Long-Qing Chen, Wen Chen, Q. M. Zhang, Qing Wang,
- 9 September 2021
Abstract
Energy Harvesting
Energy harvesting from human motion is regarded as a promising protocol for powering portable electronics. In article number 2103056, Chang Kyu Jeong, Wen Chen, Qing Wang, and co-workers demonstrate a hydrogel ionic diode based on the stacked structures of anionic and cationic ionomers embedded with conductive nanomaterials networks for tactile sensing, pressure imaging, and touchpad applications.
Inside Front Cover
free access
A Magneto‐Heated Ferrimagnetic Sponge for Continuous Recovery of Viscous Crude Oil (Adv. Mater. 36/2021)
- 9 September 2021
Abstract
Environmental Remediation
In article number 2100074, Yang Lu, Shu-Hong Yu, and co-workers report ferrimagnetic sponges for continuous recovery of viscous crude oil under the exposure of alternating magnetic field. The viscosity of crude oil around the magneto-heated sponge decreases sharply, thus accelerating the absorption into the sponge and achieving continuous recovery.
The following is a list of the most cited articles based on citations published in the last three years, according to CrossRef.
Two‐Dimensional Nanocrystals Produced by Exfoliation of Ti3AlC2
Michael Naguib, Murat Kurtoglu, Volker Presser, Jun Lu, Junjie Niu, Min Heon, Lars Hultman, Yury Gogotsi, Michel W. Barsoum,
- 4248-4253
- 22 August 2011
Abstract
2D Ti3C2 nanosheets, multilayer structures, and conical scrolls produced by room temperature exfoliation of Ti3AlC2 in HF are reported. Since Ti3AlC2 is a member of a 60+ group of layered ternary carbides and nitrides, this discovery opens a door to the synthesis of a large number of other 2D crystals.
25th Anniversary Article: MXenes: A New Family of Two‐Dimensional Materials
- 992-1005
- 19 December 2013
Abstract
MXenes are a new family of two-dimensional early transition metal carbides and carbonitrides produced by etching a metal layer from ternary layered carbides called MAX phases. This review describes the progress—both theoretical and experimental—in the synthesis, understanding of structure, measuring of properties, and development of applications of MXenes. In addition, future research directions and challenging open questions are discussed.
30 Years of Lithium‐Ion Batteries
- 14 June 2018
Abstract
The major development events in the history of lithium-ion batteries are presented and the driving forces responsible for the various technological shifts are discussed.
Heterojunction Photocatalysts
- 21 February 2017
Abstract
Heterojunction photocatalysts attract a lot of attention because of their effectiveness for spatial separation of photogenerated electron–hole pairs. Therefore, various types of heterojunction photocatalyst are applied in different photocatalytic fields, including H2 production, CO2 reduction, and pollutant degradation. The development of heterojunction photocatalysts can lead to significant advancements in the photocatalysis field.
Polymeric Photocatalysts Based on Graphitic Carbon Nitride
- 2150-2176
- 20 February 2015
Abstract
Polymeric g-C3N4-based photocatalysts are very attractive due to their unique electronic and physicochemical properties, which make them well suited for various applications, such as photocatalytic water splitting, CO2 reduction, pollutant degradation, organic syntheses, and bacterial disinfection. These unique properties can be achieved by optimized preparation, nanostructural design, and bandgap engineering of g-C3N4, as well as by the construction of g-C3N4-based semiconductor heterojunctions.
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