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Journal ArticleDOI: 10.1002/ADMA.202007848

A Morphable Ionic Electrode Based on Thermogel for Non-Invasive Hairy Plant Electrophysiology.

04 Mar 2021-Advanced Materials (John Wiley & Sons, Ltd)-Vol. 33, Iss: 14, pp 2007848
Abstract: Plant electrophysiology lays the foundation for smart plant interrogation and intervention. However, plant trichomes with hair-like morphologies present topographical features that challenge stable and high-fidelity non-invasive electrophysiology, due to the inadequate dynamic shape adaptability of conventional electrodes. Here, this issue is overcome using a morphable ionic electrode based on a thermogel, which gradually transforms from a viscous liquid to a viscoelastic gel. This transformation enables the morphable electrode to lock into the abrupt hairy surface irregularities and establish a conformal and adhesive interface. It achieves down to one tenth of the impedance and 4-5 times the adhesive strengths of conventional hydrogel electrodes on hairy leaves. As a result of the improved electrical and mechanical robustness, the morphable electrode can record more than one order of magnitude higher signal-to-noise ratio on hairy plants and maintains high-fidelity recording despite plant movements, achieving superior performance to conventional hydrogel electrodes. The reported morphable electrode is a promising tool for hairy plant electrophysiology and may be applied to diversely textured plants for advanced sensing and modulation.

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Citations
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5 results found


Journal ArticleDOI: 10.1039/D1TC01578H
Fanfan Fu1, Jilei Wang1, Jing Yu1Institutions (1)
Abstract: Conductive hydrogels are promising material candidates in artificial skin and muscles, flexible and implantable bioelectronics, and tissue engineering. However, it is still a challenging task to formulate hydrogels with high electrical conductivity without compromising their physicochemical properties. Herein, we report an interpenetrating poly(acrylic acid)-poly(3,4-ethylenedioxythiophene) (PAA-PEDOT) hydrogel with high electrical conductivity and good stretchability. A second PEDOT hydrogel network is electrochemically polymerized into an existing PAA hydrogel network. The interpenetrating hydrogel can be readily prepared and integrated into epidermal flexible electronic devices for the real-time, on-body detection of various ions in human sweat. The interpenetrating PAA-PEDOT conductive hydrogel has the potential to be an important building material for various flexible electronic devices for personalized healthcare.

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Topics: Self-healing hydrogels (62%), Bioelectronics (51%)

2 Citations


Journal ArticleDOI: 10.1007/S12274-021-3770-8
Faqing Cao1, Baohu Wu2, Tianyu Li3, Shengtong Sun1  +2 moreInstitutions (3)
19 Aug 2021-Nano Research
Abstract: The safe, flexible, and environment-friendly Zn-ion batteries have aroused great interests nowadays. Nevertheless, flagrant Zn dendrite uncontrollably grows in liquid electrolytes due to insufficient surface protection, which severely impedes the future applications of Zn-ion batteries especially at high current densities. Gel electrolytes are emerging to tackle this issue, yet the required high modulus for inhibiting dendrite growth as well as concurrent poor interfacial contact with roughened Zn electrodes are not easily reconcilable to regulate the fragile Zn/Zn2+ interface. Here we demonstrate, such a conflict may be defeated by using a mechanoadaptive cellulose nanofibril-based morphing gel electrolyte (MorphGE), which synergizes bulk compliance for optimizing interfacial contact as well as high modulus for suppressing dendrite formation. Moreover, by anchoring desolvated Zn2+ on cellulose nanofibrils, the side reactions which induce dendrite formation are also significantly reduced. As a result, the MorphGE-based symmetrical Zn-ion battery demonstrated outstanding stability for more than 100 h at the high current density of 10 mA·cm−2 and areal capacity of 10 mA·h·cm−2, and the corresponding Zn-ion battery delivered a prominent specific capacity of 100 mA·h·g−1 for more than 500 cycles at 20 C. The present example of engineering the mechanoadaptivity of gel electrolytes will shed light on a new pathway for designing highly safe and flexible energy storage devices.

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Open accessJournal ArticleDOI: 10.1002/CPLU.202100377
Kun Tian, Yannan Lu1, Ruqing Liu2, Xian Jun Loh3  +1 moreInstitutions (3)
01 Nov 2021-ChemPlusChem
Abstract: Organic additives can enhance the amplified spontaneous emission (ASE) performance of inorganic cesium lead halide perovskites (CsPbBr3 ) but volatility, potential hygroscopicity and oxidative degradation of these additives jeopardizes the thermal stability and shelf-life of blended CsPbBr3 films. To address this problem, we have fabricated perovskite films in a two-step solution protocol involving as little added polyethylene oxide (PEO) as possible. These films exhibited enhanced crystallization, improved photoluminescence (PL) intensity and prolonged lifetimes. Their hierarchical morphology and surface passivation lowered the ASE threshold from 278 to 176 μЈ/cm2 under one-photon nanosecond laser excitation. The proportion of added PEO was 0.3 wt% and was subsequently almost fully removed, thereby reducing its adverse influence on the stability of resulting films under continuous pulsed laser excitation. Stable ASE spectra could be stimulated after storage in air for 10 months.

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Topics: Perovskite (structure) (52%), Amplified spontaneous emission (52%), Photoluminescence (50%) ... show more

Open accessJournal ArticleDOI: 10.1002/SMLL.202104482
Chun-Chun Qu1, Xu-Yang Sun2, Wen-Xiu Sun1, Ling-Xiao Cao1  +2 moreInstitutions (2)
18 Nov 2021-Small
Abstract: The excellent stretchability and biocompatibility of flexible sensors have inspired an emerging field of plant wearables, which enable intimate contact with the plants to continuously monitor the growth status and localized microclimate in real-time. Plant flexible wearables provide a promising platform for the development of plant phenotype and the construction of intelligent agriculture via monitoring and regulating the critical physiological parameters and microclimate of plants. Here, the emerging applications of plant flexible wearables together with their pros and cons from four aspects, including physiological indicators, surrounding environment, crop quality, and active control of growth, are highlighted. Self-powered energy supply systems and signal transmission mechanisms are also elucidated. Furthermore, the future opportunities and challenges of plant wearables are discussed in detail.

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References
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48 results found


Journal ArticleDOI: 10.1002/ADMA.201301921
Jae-Woong Jeong1, Woon-Hong Yeo1, Aadeel Akhtar1, James J. S. Norton1  +11 moreInstitutions (5)
01 Dec 2013-Advanced Materials
Abstract: Thin, soft, and elastic electronics with physical properties well matched to the epidermis can be conformally and robustly integrated with the skin. Materials and optimized designs for such devices are presented for surface electromyography (sEMG). The findings enable sEMG from wide ranging areas of the body. The measurements have quality sufficient for advanced forms of human-machine interface.

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484 Citations


Open accessJournal ArticleDOI: 10.1038/NATURE12478
22 Aug 2013-Nature
Abstract: Wounded leaves communicate their damage status to one another through a poorly understood process of long-distance signalling. This stimulates the distal production of jasmonates, potent regulators of defence responses. Using non-invasive electrodes we mapped surface potential changes in Arabidopsis thaliana after wounding leaf eight and found that membrane depolarizations correlated with jasmonate signalling domains in undamaged leaves. Furthermore, current injection elicited jasmonoyl-isoleucine accumulation, resulting in a transcriptome enriched in RNAs encoding key jasmonate signalling regulators. From among 34 screened membrane protein mutant lines, mutations in several clade 3 GLUTAMATE RECEPTOR-LIKE genes (GLRs 3.2, 3.3 and 3.6) attenuated wound-induced surface potential changes. Jasmonate-response gene expression in leaves distal to wounds was reduced in a glr3.3 glr3.6 double mutant. This work provides a genetic basis for investigating mechanisms of long-distance wound signalling in plants and indicates that plant genes related to those important for synaptic activity in animals function in organ-to-organ wound signalling.

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Topics: Jasmonate (54%), Arabidopsis thaliana (52%), Mutant (50%)

460 Citations


Journal ArticleDOI: 10.1038/360062A0
D. C. Wildon1, J. F. Thain1, P. E. H. Minchin, I. R. Gubb1  +5 moreInstitutions (2)
05 Nov 1992-Nature
Abstract: THE wound response of several plant species involves the activation of proteinase inhibitor (pin) genes and the accumulation of pin proteins at the local site of injury and systemically throughout the unwounded aerial regions of the plant1,2. It has been suggested that a mobile chemical signal is the causal agent linking the local wound stimulus to the distant systemic response, and candidates such as oligosaccharides3, abscisic acid4 and a polypeptide5,6 have been put forward. But the speed of transmission is high for the transport of a chemical signal in the phloem. The wound response of tomato plants can be inhibited by salicylic acid7 and agents like fusicoccin that affect ion transport8, and wounding by heat9 or physical injury produces electrical activity that has similarities to the epithelial conduction system10 used to transmit a stimulus in the defence responses of some lower animals11. Here we design experiments to distinguish between a phloem-transmissible chemical signal and a physically propagated signal based on electrical activity. We show that translocation in the phloem of tomato seedlings can be completely inhibited without effect on the systemic accumulation of pin transcripts and pin activity, and without hindrance to propagated electrical signals.

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Topics: PIN proteins (55%), Systemin (54%)

427 Citations


Journal ArticleDOI: 10.1021/LA0617964
03 Jan 2007-Langmuir
Abstract: Superhydrophobicity is obtained on photolithographically structured silicon surfaces consisting of flat-top pillars after a perfluorosilanization treatment. Systematic static contact angle measurements were carried out on these surfaces as a function of pillar parameters that geometrically determine the surface roughness, including pillar height, diameter, top perimeter, overall filling factor, and disposition. In line with thermodynamics models, two regimes of static contact angles are observed varying each parameter independently: the "Cassie" regime, in which the water drop sits suspended on top of the pillars (referred to as composite), corresponding to experimental contact angles greater than 140-150 degrees, and the "Wenzel" regime, in which water completely wets the asperities (referred to as wetted), corresponding to lower experimental contact angles. A transition between the Cassie and Wenzel regimes corresponds to a set of well-defined parameters. By smoothly depositing water drops on the surfaces, this transition is observed for surface parameter values far from the calculated ones for the thermodynamic transition, therefore offering evidence for the existence of metastable composite states. For all studied parameters, the position of the experimental transition correlates well with a rough estimation of the energy barrier to be overcome from a composite metastable state in order to reach the thermodynamically favored Wenzel state. This energy barrier is estimated as the surface energy variation between the Cassie state and the hypothetical composite state with complete filling of the surface asperities by water, keeping the contact angle constant.

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Topics: Wetting transition (66%), Wetting (54%), Contact angle (52%) ... show more

302 Citations


Open accessBook
03 Apr 2013-
Abstract: Introduction to surface topography.- The areal field parameters.- The areal feature parameters.- Areal filtering methods.- Areal form removal.- Areal fractal methods.- Choosing the appropriate parameter.- Characterization of individual areal features.- Multi-scale signature of surface topography.- Correlation of areal surface texture parameters to solar cell efficiency.- Characterisation of cylinder liner honing textures for production control.- Characterization of the mechanical bond strength for copper on glass plating applications.- Inspection of laser structured cams and conrods.- Road surfaces.

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Topics: Areal feature (57%), Surface roughness (52%), Surface finish (52%)

280 Citations


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