Engineering

  • Article
    | Open Access

    Metabolic dynamics within the small intestine are difficult to study due to the lack of in situ access. Here, the authors report an ingestible, self-powered, and wireless biosensing system, demonstrating proof-of-principle real-time glucose monitoring in the small intestines of pigs.

    • Ernesto De la Paz
    • , Nikhil Harsha Maganti
    •  & Patrick P. Mercier
  • Article
    | Open Access

    In situ generated lesion of red blood cells decreases the quality of stored blood and limits its shelf-life. Here, the authors demonstrate that intermittent scavenging of storage lesions using electrostatic interactions by nanofibrous sheets could enhance the quality and shelf-life of stored blood.

    • Subhashini Pandey
    • , Manohar Mahato
    •  & Praveen Kumar Vemula
  • Article
    | Open Access

    Fabrication errors limit the scaling of programmable photonic circuits. Here the authors show how a broad class of circuits can be made asymptotically fault-tolerant, where the effect of errors remains controlled regardless of the circuit’s size.

    • Ryan Hamerly
    • , Saumil Bandyopadhyay
    •  & Dirk Englund
  • Article
    | Open Access

    The application of rolling motion to microswarm navigation and cargo delivery has been constrained by the need for a physical boundary to roll along to date. Here, Zhang et al. solve this problem by introducing a reconfigurable virtual wall implemented by a combination of magnetic and acoustic fields.

    • Zhiyuan Zhang
    • , Alexander Sukhov
    •  & Daniel Ahmed
  • Article
    | Open Access

    Fouling is a continuous challenge for the effective application of membranes in oily wastewater treatment. Here, the authors present a hydrophobic chain engineering strategy to regulate the surface of graphene oxide-based membranes at a molecular scale for increased antifouling even at high permeance.

    • Chao Yang
    • , Mengying Long
    •  & Zhongyi Jiang
  • Article
    | Open Access

    Digestive surgical leaks manifesting days after a successful surgery can lead to severe complications and affect healthcare worldwide. Here, the authors address the problem holistically with a hydrogel patch capable of sealing tissues, while detecting imminent leaks via a smartphone-operated ultrasound probe.

    • Alexandre H. C. Anthis
    • , Maria Paulene Abundo
    •  & Inge K. Herrmann
  • Article
    | Open Access

    Shape morphing offers a promising method to transform 2D electronics into 3D structured devices. Here authors show a shape morphing strategy of homogeneous inert plastic thin films into free-standing 3D frameworks by programming the plastic strain in films under peeling.

    • Feilong Zhang
    • , Dong Li
    •  & Xiaodong Chen
  • Article
    | Open Access

    High thermal conductivity electronic materials are critical for next-generation electronics and photonics. Here, the authors report isotropic high thermal conductivity of 3C-SiC wafers exceeding 500 W m−1K−1.

    • Zhe Cheng
    • , Jianbo Liang
    •  & David G. Cahill
  • Article
    | Open Access

    Inspired by the characteristics of textile-based flexible electronic sensors, the authors report a braided electronic cord with a low-cost, and automated fabrication to realize imperceptible, designable, and scalable user interfaces with the features of user-friendliness, excellent durability and rich interaction mode.

    • Min Chen
    • , Jingyu Ouyang
    •  & Guangming Tao
  • Article
    | Open Access

    Conversion of CO2 into value-added products with renewable energy provides a promising route to realize carbon neutrality. Here, authors design and construct a Si photoelectrochemical flow cells for CO2 reduction reaction to achieve a high solar-to-fuel conversion efficiency.

    • Bin Liu
    • , Tuo Wang
    •  & Jinlong Gong
  • Article
    | Open Access

    The scalability of neuromorphic devices depends on the dismissal of capacitors and additional circuits. Here Liu et al. report an artificial neuron based on the polarization and depolarization of an anti-ferroelectric film, avoiding additional elements and reaching 37 fJ/spike of power consumption.

    • Rongrong Cao
    • , Xumeng Zhang
    •  & Qi Liu
  • Article
    | Open Access

    Designing efficient reconfigurable field effect transistors remains a challenge. Here, the authors develop a transistor with three distinct operation modes, realized directly on an industrial 22nm FDSOI platform, demonstrating a reconfigurable analog circuit element with signal follower, phase shifter, and frequency doubler operation.

    • Maik Simon
    • , Halid Mulaosmanovic
    •  & Jens Trommer
  • Article
    | Open Access

    Dislocations are often perceived as a culprit for degradation in functionality. Here, the authors introduce a general framework for engineering dislocations and domain walls and demonstrate its full potential on a ferroelectric BaTiO3 single crystal.

    • Fangping Zhuo
    • , Xiandong Zhou
    •  & Jürgen Rödel
  • Article
    | Open Access

    Retinal prosthetics has shown its promise in restoring vision, despite limited acuity. Here, the authors demonstrate a high-resolution prosthetic vision that enables grating acuity matching the natural visual resolution in rats, paving the way to higher acuity of prosthetic vision in atrophic macular degeneration.

    • Bing-Yi Wang
    • , Zhijie Charles Chen
    •  & Daniel Palanker
  • Article
    | Open Access

    Flexible magnetic sensors with high sensitivity have a wide variety of medical and industrial uses, however, making such sensors robust and flexible at the same time can be challenging. Here, the authors demonstrate a high sensitivity flexible magnetic sensor that exhibits self-healing under an applied alternative magnetic field, with complete performance recovery.

    • Rui Xu
    • , Gilbert Santiago Cañón Bermúdez
    •  & Denys Makarov
  • Article
    | Open Access

    Designing efficient sensing devices for ambulatory use remains a challenge. Here, the authors demonstrate heterogeneous serpentine ribbons enable a stretchable and robust interface between sub-micron thin graphene e-tattoos and thick and rigid printed circuit boards, which allows ambulatory electrodermal activity monitoring on the palm.

    • Hongwoo Jang
    • , Kaan Sel
    •  & Nanshu Lu
  • Article
    | Open Access

    The authors present a subcutaneous power supply which coverts NIR-II light to electricity via combination of photothermal conversion and thermoelectric conversion. They demonstrate that it can recharge an implanted wireless camera upon irradiation with NIR-II light through the skin.

    • Shanzhi Lyu
    • , Yonglin He
    •  & Yapei Wang
  • Article
    | Open Access

    Synthetic materials that can repeatedly self-repair, akin to biological systems, are vital to meeting the 21st century’s infrastructural demands. Here, authors develop fiber-reinforced composites with rapid and prolonged in situ self-healing while also preserving structural integrity.

    • Alexander D. Snyder
    • , Zachary J. Phillips
    •  & Jason F. Patrick
  • Article
    | Open Access

    Designing and manufacturing eco/bioresorbable electronic systems remains a challenge. The authors introduce a picosecond-pulsed laser-based scheme that exploits controlled patterning, thinning, and/or cutting to manipulate multilayers of eco/bioresorbable materials for a wide range of advanced electronic systems.

    • Quansan Yang
    • , Ziying Hu
    •  & John A. Rogers
  • Article
    | Open Access

    The conventional von Neumann computing architecture is ill suited to data intensive tasks as data must be repeated moved between the separated processing and memory units. Here, Seo et al propose a CMOS compatible, highly linear gate injection field-effect transistor where data can be both stored and processed.

    • Seokho Seo
    • , Beomjin Kim
    •  & Shinhyun Choi
  • Article
    | Open Access

    Filtering capacitors are essential to smooth high voltage alternating current lines but are typically limited to hundreds of volts. Here, the authors demonstrate an aqueous hybrid electrochemical capacitor that can exhibit an operating voltage of 1,000 V when assembled into a device of 670 units.

    • Zhou Li
    • , Xiaopeng Wang
    •  & Liangti Qu
  • Article
    | Open Access

    Lab-on-a-chip systems have been widely used in microscale liquid manipulation and greatly benefit from automation. Durrer et al. show a robot-assisted acoustofluidic end effector system, comprising a robotic arm and an acoustofluidic device, that combines both robotic and microfluidic functionalities.

    • Jan Durrer
    • , Prajwal Agrawal
    •  & Daniel Ahmed
  • Article
    | Open Access

    Additively manufactured materials contain different types of volumetric defects. Here, the authors utilize the most distinguishing morphological features among different defect types to propose a defect classification methodology.

    • Arun Poudel
    • , Mohammad Salman Yasin
    •  & Nima Shamsaei
  • Article
    | Open Access

    Controlling emission and propagation of acoustic waves offers new design opportunities for acoustic devices. Here the authors demonstrate such controls thanks to the emergence of a synthetic pseudo-spin in two-dimensional acoustic metamaterial.

    • Matthew Weiner
    • , Xiang Ni
    •  & Alexander B. Khanikaev
  • Article
    | Open Access

    The effect of geometrical confinement on the locomotion of microrobots is crucial to operating them in real-world applications. Bozuyuk et al. show that the locomotion efficiency of microrollers decreases in confined spaces at high rotation frequencies and propose a slender geometry to overcome this problem.

    • Ugur Bozuyuk
    • , Amirreza Aghakhani
    •  & Metin Sitti
  • Article
    | Open Access

    Here, the authors fabricate large area and highly aligned polymer semiconductor sub-microwires arrays via coaxial focused electrohydrodynamic jet printing technology, achieving high on/off ratio and average mobility that is 5x higher than that of thin film based organic field effect transistors.

    • Dazhi Wang
    • , Liangkun Lu
    •  & Yunqi Liu
  • Article
    | Open Access

    The development of machine learning systems has to ensure their robustness and reliability. The authors introduce a framework that defines a principled process of machine learning system formation, from research to production, for various domains and data scenarios.

    • Alexander Lavin
    • , Ciarán M. Gilligan-Lee
    •  & Yarin Gal
  • Article
    | Open Access

    Surface modification of nanoparticles by cell membrane (CM) coating to improve their bio-interface properties often results in partial coating. Here the authors show that partial coating is an intermediate state due to the absorption of CM fragments or vesicles and can be resolved by increasing CM fluidity with external phospholipids.

    • Lizhi Liu
    • , Dingyi Pan
    •  & Vesa-Pekka Lehto
  • Article
    | Open Access

    Spontaneous low-frequency oscillations, which are a feature of biological systems, are challenging to engineer into microrobotic systems. The authors discover a mechanism for asymmetry-induced order and realise electrical and mechanical oscillations in a particle collective to power a microrobotic arm.

    • Jing Fan Yang
    • , Thomas A. Berrueta
    •  & Michael S. Strano
  • Article
    | Open Access

    Lower concentrations of toxic cryoprotective agents require rapid and scalable rewarming techniques. Here, the authors report on a joule heating–based platform where samples are rapidly rewarmed by contact with a voltage pulsed electrical conductor and demonstrate the preservation of Drosophila embryos and rat kidney slices.

    • Li Zhan
    • , Zonghu Han
    •  & John C. Bischof
  • Article
    | Open Access

    Zhong et al report sodium-promoted metallic Ru nanoparticles for the direct production of olefins from syngas with ultrahigh carbon efficiency where the total selectivity of undesired CH4 and CO2 is suppressed to only 5% for over 500 hours on stream.

    • Hailing Yu
    • , Caiqi Wang
    •  & Liangshu Zhong
  • Article
    | Open Access

    Designing an efficient platform that enables verbal communication without vocalization remains a challenge. Here, the authors propose a silent speech interface by utilizing a deep learning algorithm combined with strain sensors attached near the subject’s mouth, able to collect 100 words and classify at a high accuracy rate.

    • Taemin Kim
    • , Yejee Shin
    •  & Ki Jun Yu
  • Article
    | Open Access

    Fusion welding of 7000 series aluminum alloy is plagued by cracking from a fine equiaxed zone (FQZ). Here, the authors quantify key softening mechanisms, show the damage accumulation sequence, and propose a hybrid laser/arc welding strategy to mitigate the FQZ and increase weld strength and toughness.

    • Yanan Hu
    • , Shengchuan Wu
    •  & Philip J. Withers
  • Article
    | Open Access

    One gap between the neuro-inspired computing and its applications lies in the intrinsic variability of the devices. Here, Payvand et al. suggest a technologically plausible co-design of the hardware architecture which takes into account and exploits the physics behind memristors.

    • Melika Payvand
    • , Filippo Moro
    •  & Giacomo Indiveri
  • Article
    | Open Access

    The digital transformation and Industry 4.0 technologies are rapidly shaping the future of manufacturing. Here, authors use reliable big data to quantitatively evaluate lubricants performance and select desirable candidates for application in target manufacturing processes.

    • Xiao Yang
    • , Heli Liu
    •  & Liliang Wang
  • Article
    | Open Access

    Designing a computing scheme to solve complex tasks as the big data field proliferates remains a challenge. Here, the authors present a probabilistic bit generation hardware built using the random nature of CuxTe1−x/HfO2/Pt memristors capable of performing logic gates with invertible mode, showing the expandability to complex logic circuits.

    • Kyung Seok Woo
    • , Jaehyun Kim
    •  & Cheol Seong Hwang