Abstract:
:Soft robotics may enable many new technologies in which humans and robots physically interact, yet the necessary high-performance soft actuators still do not exist. The optimal soft actuators need to be fast and forceful and have programmable shape changes. Furthermore, they should be energy efficient for untethered applications and easy to fabricate. Here, we combine desirable characteristics from two distinct active material systems: fast and highly efficient actuation from dielectric elastomers and directed shape programmability from liquid crystal elastomers. Via a top-down photoalignment method, we program molecular alignment and localized giant elastic anisotropy into the liquid crystal elastomers. The linearly actuated liquid crystal elastomer monoliths achieve strain rates over 120% per second with an energy conversion efficiency of 20% while moving loads over 700 times the elastomer weight. The electric actuation mechanism offers unprecedented opportunities toward miniaturization with shape programmability, efficiency, and more degrees of freedom for applications in soft robotics and beyond.
journal_name
Sci Advjournal_title
Science advancesauthors
Davidson ZS,Shahsavan H,Aghakhani A,Guo Y,Hines L,Xia Y,Yang S,Sitti Mdoi
10.1126/sciadv.aay0855subject
Has Abstractpub_date
2019-11-22 00:00:00pages
eaay0855issue
11issn
2375-2548pii
aay0855journal_volume
5pub_type
杂志文章相关文献
Science Advances文献大全abstract::Among the existing elemental characterization techniques, particle-induced x-ray emission (PIXE) and energy-dispersive x-ray (EDX) spectroscopy are two of the most widely used in different scientific and technological fields. Here, we present the first quantitative laser-driven PIXE and laser-driven EDX experimental i...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.abc8660
更新日期:2021-01-15 00:00:00
abstract::Catalytic dehydrogenation and hydrogenation of amines and alcohols are important in the synthesis of fine chemicals. Despite several efficient homogeneous catalysts having been identified, highly active heterogeneous catalysts remain elusive, although they would meet an unmet need. Here, we show that bimetallic Pd-Au ...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.abb3831
更新日期:2020-07-01 00:00:00
abstract::Double seismic zones are two-layered distributions of intermediate-depth earthquakes that provide insight into the thermomechanical state of subducting slabs. We present new precise hypocenters of intermediate-depth earthquakes in the Tonga subduction zone obtained using data from local island-based, ocean-bottom, and...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.1601755
更新日期:2017-01-11 00:00:00
abstract::The exceptionally long quantum coherence times of phosphorus donor nuclear spin qubits in silicon, coupled with the proven scalability of silicon-based nano-electronics, make them attractive candidates for large-scale quantum computing. However, the high threshold of topological quantum error correction can only be ca...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.1500707
更新日期:2015-10-30 00:00:00
abstract::We describe an approach to print composite polymers in high-resolution three-dimensional (3D) architectures that can be rapidly transformed to a new permanent configuration directly by heating. The permanent shape of a component results from the programmed time evolution of the printed shape upon heating via the desig...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.1602890
更新日期:2017-04-12 00:00:00
abstract::The outbreak of the highly contagious and deadly severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), also known as coronavirus disease 2019 (COVID-19), has posed a serious threat to public health across the globe, calling for the development of effective diagnostic markers and therapeutics. Here, we report a...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.abc1564
更新日期:2020-07-31 00:00:00
abstract::G protein-coupled receptors (GPCRs) play a fundamental role in the modulation of synaptic transmission. A pivotal example is provided by the metabotropic glutamate receptor type 4 (mGluR4), which inhibits glutamate release at presynaptic active zones (AZs). However, how GPCRs are organized within AZs to regulate neuro...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.aay7193
更新日期:2020-04-15 00:00:00
abstract::Proinflammatory activation and accumulation of adipose tissue macrophages (ATMs) are associated with increased risk of insulin resistance in obesity. Here, we described the previously unidentified role of selenocysteine insertion sequence-binding protein 2 (SBP2) in maintaining insulin sensitivity in obesity. SBP2 was...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.aav0198
更新日期:2019-08-14 00:00:00
abstract::Spatial patterns of gene expression in living organisms orchestrate cell decisions in development, homeostasis, and disease. However, most methods for reconstructing gene patterning in 3D cell culture and artificial tissues are restricted by patterning depth and scale. We introduce a depth- and scale-flexible method t...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.abb9062
更新日期:2020-09-30 00:00:00
abstract::The accelerating global spread of arboviruses, such as Zika virus (ZIKV), highlights the need for more proactive mosquito surveillance. However, a major challenge during arbovirus outbreaks has been the lack of rapid and affordable tests for pathogen detection in mosquitoes. We show for the first time that near-infrar...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.aat0496
更新日期:2018-05-23 00:00:00
abstract::We analyze a collection of empirical networks in a wide spectrum of disciplines and show that strong non-normality is ubiquitous in network science. Dynamical processes evolving on non-normal networks exhibit a peculiar behavior, as initial small disturbances may undergo a transient phase and be strongly amplified in ...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.aau9403
更新日期:2018-12-12 00:00:00
abstract::Conjugated polymer-polyelectrolyte blends combine and couple electronic semiconductor functionality with selective ionic transport, making them attractive as the active material in organic biosensors and bioelectronics, electrochromic displays, neuromorphic computing, and energy conversion and storage. Although extens...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.aao3659
更新日期:2017-12-15 00:00:00
abstract::The attraction between electrons and holes in semiconductors forms excitons, which largely determine the optical properties of the hosting material, and hence the device performance, especially for low-dimensional systems. Mono- and few-layer black phosphorus (BP) are emerging two-dimensional (2D) semiconductors. Desp...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.aap9977
更新日期:2018-03-16 00:00:00
abstract::Holoprosencephaly (HPE) is a congenital forebrain defect often associated with embryonic lethality and lifelong disabilities. Currently, therapeutic and diagnostic options are limited by lack of knowledge of potential disease-causing mutations. We have identified a new mutation in the PRDM15 gene (C844Y) associated wi...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.aax9852
更新日期:2020-01-10 00:00:00
abstract::The spin-polarized surface states of topological insulators (TIs) are attractive for applications in spintronics and quantum computing. A central challenge with these materials is to reliably tune the chemical potential of their electrons with respect to the Dirac point and the bulk bands. We demonstrate persistent, b...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.1500640
更新日期:2015-10-09 00:00:00
abstract::Interaction of swimming bacteria with flows controls their ability to explore complex environments, crucial to many societal and environmental challenges and relevant for microfluidic applications such as cell sorting. Combining experimental, numerical, and theoretical analysis, we present a comprehensive study of the...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.abb2012
更新日期:2020-07-10 00:00:00
abstract::Intrachain charge transport is unique to conjugated polymers distinct from inorganic and small molecular semiconductors and is key to achieving high-performance organic electronics. Polymer backbone planarity and thin film morphology sensitively modulate intrachain charge transport. However, simple, generic nonsynthet...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.aaw7757
更新日期:2019-08-09 00:00:00
abstract::Six percent of Americans, including 3 million high schoolers, use e-cigarettes, which contain potentially toxic substances, volatile organic compounds, and metals. We present the first human study on the effects of e-cigarette exposure in the oral cavity. By interrogating both immunoinflammatory responses and microbia...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.aaz0108
更新日期:2020-05-27 00:00:00
abstract::Honeybees use the waggle dance to share information about food-site locations with nestmates. However, the importance of this behavior in colony foraging success remains unclear. We tested whether spatial dance information affects colony foraging success in a human-modified temperate environment by comparing colonies ...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.aat0450
更新日期:2019-02-13 00:00:00
abstract::Behavioral and clinical studies suggest a critical role of substance P (SP)/neurokinin-1 receptor (NK-1R) signaling in alcohol dependence. Here, we examined regulation of GABA transmission in the medial subdivision of the central amygdala (CeM) by the SP/NK-1R system, and its neuroadaptation following chronic alcohol ...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.aaz1050
更新日期:2020-03-18 00:00:00
abstract::Induced earthquakes currently pose a significant hazard in the central United States, but there is considerable uncertainty about the severity of their ground motions. We measure stress drops of 39 moderate-magnitude induced and tectonic earthquakes in the central United States and eastern North America. Induced earth...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.1700772
更新日期:2017-08-02 00:00:00
abstract::Deep CO2 emissions characterize many nonvolcanic, seismically active regions worldwide, and the involvement of deep CO2 in the earthquake cycle is now generally recognized. However, no long-time records of such emissions have been published, and the temporal relations between earthquake occurrence and tectonic CO2 rel...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.abc2938
更新日期:2020-08-26 00:00:00
abstract::The Mott metal-insulator transition, a paradigm of strong electron-electron correlations, has been considered as a source of intriguing phenomena. Despite its importance for a wide range of materials, fundamental aspects of the transition, such as its universal properties, are still under debate. We report detailed me...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.1601646
更新日期:2016-12-07 00:00:00
abstract::Organophosphate-based pesticides inhibit acetylcholinesterase (AChE), which plays a pivotal role in neuromuscular function. While spraying in the field, farmworkers get exposed to pesticides through the dermal route. Internalized pesticide inhibits AChE, which leads to neurotoxicity, cardiotoxicity, cognitive dysfunct...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.aau1780
更新日期:2018-10-17 00:00:00
abstract::Marine ecosystems are responsible for virtually all production of omega-3 (ω3) long-chain polyunsaturated fatty acids (PUFA), which are essential nutrients for vertebrates. Current consensus is that marine microbes account for this production, given their possession of key enzymes including methyl-end (or "ωx") desatu...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.aar6849
更新日期:2018-05-02 00:00:00
abstract::The Wiedemann-Franz (WF) law has been tested in numerous solids, but the extent of its relevance to the anomalous transverse transport and the topological nature of the wave function, remains an open question. Here, we present a study of anomalous transverse response in the noncollinear antiferromagnet Mn3Ge extended ...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.aaz3522
更新日期:2020-04-24 00:00:00
abstract::The past few years have witnessed rapid advances in the synthesis of high-quality perovskite nanocrystals (PNCs). However, despite the impressive developments, the stability of PNCs remains a substantial challenge. The ability to reliably improve stability of PNCs while retaining their individual nanometer size repres...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.aax4424
更新日期:2019-11-29 00:00:00
abstract::Wearable textile electronics are highly desirable for realizing personalized health management. However, most reported textile electronics can either periodically target a single physiological signal or miss the explicit details of the signals, leading to a partial health assessment. Furthermore, textiles with excelle...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.aay2840
更新日期:2020-03-13 00:00:00
abstract::In addition to their conventional uses, metal-organic frameworks (MOFs) have recently emerged as an interesting class of functional materials and precursors of inorganic materials for electrochemical energy storage and conversion technologies. This class of MOF-related materials can be broadly categorized into two gro...
journal_title:Science advances
pub_type: 杂志文章,评审
doi:10.1126/sciadv.aap9252
更新日期:2017-12-01 00:00:00
abstract::Exploration for superconductivity is one of the research frontiers in condensed matter physics. In strongly correlated electron systems, the emergence of superconductivity is often inhibited by the formation of a thermodynamically more stable magnetic/charge order. Thus, to develop the superconductivity as the thermod...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.aau3489
更新日期:2018-10-05 00:00:00