Guoyong Mao

Guoyong Mao
Johannes Kepler University Linz | JKU · Department of Soft Matter Physics

Ph.D. in Solid Mechanics

About

47
Publications
14,543
Reads
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1,131
Citations
Introduction
I am current a Post-doc working in Soft Matter Department at JKU working with soft robotics and sensors. I am interested in using mechanical tools (theory, simulation, and experiments) to guide the design and actuation of the soft robotics and soft sensors. I am also interested in the mechanism and application of the instabilities of the soft structures and materials, such as wrinkle, snap-through, and buckling problems. The final target of my research is to enhance the living and working quality of the people (especially the olds and disables) and help people reveal the secrets in nature.
Additional affiliations
October 2018 - November 2019
Johannes Kepler University Linz
Position
  • PostDoc Position
November 2015 - November 2016
Harvard University
Position
  • Researcher
September 2013 - June 2018
Zhejiang University
Position
  • PhD Student
Education
September 2009 - July 2013
Zhejiang University
Field of study
  • Engineering Mechanics

Publications

Publications (47)
Article
Full-text available
High-speed locomotion is an essential survival strategy for animals, allowing populating harsh and unpredictable environments. Bio-inspired soft robots equally benefit from versatile and ultrafast motion but require appropriate driving mechanisms and device designs. Here, we present a class of small-scale soft electromagnetic robots made of curved...
Article
Full-text available
Embedded sensors are key to optimizing processes and products; they collect data that allow time, energy, and materials to be saved, thereby reducing costs. After production, they remain in place and are used to monitor the long‐term structural health of buildings or aircraft. Fueled by climate change, sustainable construction materials such as woo...
Article
Full-text available
Paper-Based Sensors iSens are flexible, foldable, and translucent paper-based sensors. The porous substrates consist of a fiber structure that is highly permeable to liquids. Interdigital electrodes made of ultrathin copper are individually designed by one step laser ablation. This iSens platform, presented by Martin Kaltenbrunner and co-workers in...
Data
Here, is a code for the simulation of dielectric elastomer with ABAQUS. We using subroutine UANISOHYPER_INV which is easier to be programmed and incorporated with kinds of hyperelastic material models such as neo-Hookean, Mooney-Rivlin, or Gent models. reference paper: Mao, G., Hong, W., Kaltenbrunner, M., and Qu, S. (May 19, 2021). "A numerical ap...
Article
Dielectric elastomer (DE) actuators are deformable capacitors capable of a muscle-like actuation when charged. When subjected to voltage, DE membranes coated with compliant electrodes may form wrinkles due to the Maxwell stress. Here, we develop a numerical approach based on the finite element method (FEM) to predict the morphology of wrinkled DE m...
Article
Full-text available
The deep sea remains the largest unknown territory on Earth because it is so difficult to explore1–4. Owing to the extremely high pressure in the deep sea, rigid vessels5–7 and pressure-compensation systems8–10 are typically required to protect mechatronic systems. However, deep-sea creatures that lack bulky or heavy pressure-tolerant systems can t...
Article
Full-text available
Conventional refrigeration relies on hazardous agents, contributing to global warming. Soft, cheap, biodegradable solid-state elastocaloric cooling based on natural rubber offers an environmentally friendly alternative. However, no such practical cooler has been developed, as conventional soft elastocaloric designs are not fast enough to ensure adi...
Article
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Electronics implemented on biocompatible ultrathin substrates like polyethylene terephthalate, polyimide, or parylene enabled a wide range of conformable, lightweight smart wearables and implantables. However, applications in such dynamic environments require robust devices that adjust and stretch while maintaining their functionality. Universal ap...
Article
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Biodegradable and biocompatible elastic materials for soft robotics, tissue engineering or stretchable electronics with good mechanical properties, tunability, modifiability or healing properties drive technological advance, and yet they are not durable under ambient conditions and do not combine all the attributes in a single platform. We have dev...
Article
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Acting at high speed enables creatures to survive in their harsh natural environments. They developed strategies for fast actuation that inspire technological embodiments like soft robots. Here, we demonstrate a series of simulation-guided lightweight, durable, untethered, small-scale soft-bodied robots that perform large-degree deformations at hig...
Article
Full-text available
Stretchable Electronics The image, provided by Martin Kaltenbrunner and co‐workers (article number 2000065), shows magnetic interfaces serving not only as mechanical but also as electrical connectors in stretchable electronics. These connectors are safeguarded by a controlled release mechanism, preventing failure in every‐day operation and allow a...
Article
Full-text available
Rigid electromagnetic actuators serve our society in a myriad of ways for more than 200 years. However, their bulky nature restricts close collaboration with humans. Here, we introduce soft electromagnetic actuators (SEMAs) by replacing solid metal coils with liquid-metal channels embedded in elastomeric shells. We demonstrate human-friendly, simpl...
Cover Page
Full-text available
In article 1900079, Jie Shang, Run‐Wei Li, and co‐workers report a wearable capacitive sensor that can monitor human physiological signals (pulse and respiratory) in the non‐contact mode. This is achieved by using asymmetrical ring/disk‐shaped conductive material and low‐dielectric porous material to enhance the capacitive coupling effect.
Article
Full-text available
Wearable healthcare devices monitor the condition of patients outside the hospital and hence increase treatment capacity and resources. At the same time, patients benefit from wireless data transmission and conformable device designs, speeding up the rehabilitation process and integration into normal daily activities. Yet, the successful implementa...
Article
Full-text available
Wearable sensors are gradually enabling decentralized healthcare systems. However, these sensors need to be closely attached to skin, which is unsuitable for long‐term dynamic health monitoring of the patients, such as infants or persons with burn injuries. Here, a wearable capacitive sensor based on the capacitively coupled effect for healthcare m...
Article
Full-text available
Rapid energy‐efficient movements are one of nature's greatest developments. Mechanisms like snap‐buckling allow plants like the Venus flytrap to close the terminal lobes of their leaves at barely perceptible speed. Here, a soft balloon actuator is presented, which is inspired by such mechanical instabilities and creates safe, giant, and fast deform...
Article
Full-text available
Explosion of ping‐pong balls that is caused by the rapid inflation of an elastomer membrane. The illustrated ultrafast actuation is based on a plant‐inspired mechanical instability that occurs in natural rubber and can be remotely triggered, presented in article number 1903391 by Martin Kaltenbrunner and co‐workers. These new types of high‐speed so...
Article
As one of the most promising drug delivery carriers, hydrogels have received considerable attention in recent years. Many previous efforts focused on diffusion-controlled release which allows hydrogels to load and release drugs in vitro and/or in vivo. However, it hardly applies to lipophilic drug delivery due to their poor compatibility with hydro...
Article
Conductive hydrogels with ionic compounds possess great potential for the development of soft smart devices. A dielectric scarfskin is typically required for these devices to prevent short circuiting, leading to devices with lower stretchability than the hydrogel. Henceforth, commonly used dielectric materials, such as PDMS and Ecoflex, cannot be l...
Article
A key challenge in bioinspired insect-scale running robots is to make them both agile and resilient. In this study, we develop a dielectric elastomer actuated soft robot that mimics inchworms. We use an elastomer to make the soft body, a stretchable dielectric to provide electrostatic actuation of high power density, and multizone actuation to achi...
Article
Full-text available
As a type of flexible electronics, wearable heaters have attracted broad attention because of their giant potential market value, such as for use in wearable thermotherapy. Wearable heaters are required to simultaneously possess high stretchability and dynamic stability, in order to realize joints or muscles thermotherapy during exercising. Here, a...
Article
Full-text available
Mechanical flexibility and electrical reliability establish the fundamental criteria for wearable and implantable electronic devices. In order to receive intrinsically stretchable resistive switching memories, both the electrode and storage media should be flexible yet retain stable electrical properties. Experimental results and finite element ana...
Article
Pumps are widely used in nature and engineering to transport fluids, particles and mixtures. Compared to those in engineering, most natural pumps are soft, highly efficient and reliable. In this paper, we design a soft dielectric elastomer peristaltic pump (DEPP) inspired by the human heart. The DEPP is composed of two pump modules and each module...
Article
Full-text available
Dielectric elastomer (DE), as one typical soft electroactive material which processes the advantages including light weight, high energy density, high efficiency, low cost, quiet operation and so on. DE is widely used in the design and development of various transducers, such as smart actuators, sensors, generators, soft displays, soft robots and s...
Article
Loading-bearing applications of hydrogels call for materials with excellent mechanical properties. Despite the considerable progress in developing tough hydrogels, high-performance hydrogels are still required to be prepared using simple strategies. In this paper, a sponge-reinforced hydrogel composite is synthesized by combining poly(acrylamide) (...
Article
Viscoelasticity plays an important role in the instability and performance of soft transducers. Wrinkling, an instability phenomenon commonly observed on soft materials, has been studied extensively. In this paper, we theoretically investigate the viscoelastic effect on the wrinkle formation of a dielectric-elastomer (DE) balloon subjected to combi...
Article
Soft elastomeric membrane structures are widely used and commonly found in engineering and biological applications. Puncture is one of the primary failure modes of soft elastomeric membrane at large deformation when indented by rigid objects. In order to investigate the puncture failure mechanism of soft elastomeric membrane with large deformation,...
Article
Full-text available
Wrinkle is usually considered as one failure mode of membrane structure. However, it can also be harnessed in developing smart devices such as dry adhesion tape, diffraction grating, smart window, etc. In this paper, we present a method to generate voltage-controlled radial wrinkles, which are fast response and reversible, in a stretched circular d...
Article
Full-text available
Wrinkles widely existing in sheets and membranes have attracted a lot of attention in the fields of material science and engineering applications. In this paper, we present a new method to generate ordered (striplike) and steady wrinkles of a constrained dielectric elastomer (DE) sheet coated with soft electrodes on both sides subjected to high vol...
Conference Paper
Dielectric elastomers (DEs) have been extensively studied as DE actuators, DE generators, and DE sensors. Compared with DE actuators and generators, DE sensing application has the advantage that it is no need for high voltage. However, to realize the high sensitivity of the DE sensor, a well-designed structure is essential. A typical DE sensor cons...
Article
When a dielectric elastomer membrane is pre-stretched, inflated and then electromechanically activated, wrinkles may nucleate and propagate. Nucleation site, critical voltage and type of wrinkles can be tuned by controlling the initial pre-stretch, initial inflation pressure and applied voltage. We conduct a hybrid experimental and analytical study...
Article
Full-text available
Inspired by various peristaltic structures existing in nature, several bionic peristaltic actuators have been developed. In this study, we propose a novel dielectric elastomer peristaltic pump consisting of short tubular modules, with the saline solution as the electrodes. We investigate the performance of this soft pump module under hydraulic pres...
Article
Full-text available
Dielectric elastomer (DE) transducers frequently undergo voltage-induced large deformation which may lead to mechanical instabilities. Here, we investigate wrinkle formation and propagation on the surface of a DE membrane mounted on an air chamber and subject to step voltage. Our experiments show that the geometric characteristics of the wrinkle mo...
Article
Full-text available
Dielectric elastomer (DE) can undergo large deformation when subjected to external forces or voltage, leading to the variation of the capacitance. A novel DE sensor is proposed to detect compressive force. This sensor consists of a series of elements made of DE membrane with out-of-plane deformation. Each element experiences highly inhomo-geneous l...
Article
The inflated elastomeric balloon structures are widely used in engineering fields such as elastomeric actuators and artificial muscles. This study, involving both experiment and modeling, is focused on the prestretch effect on non-linear behavior of inflated short-length tubular elastomeric balloons. In the experiment, the prestretched tubular elas...
Conference Paper
Dielectric elastomer (DE) actuators can convert electrical energy to mechanical energy. However, actuating DE membranes requires applying high voltage. Continuously applying high voltage on DE actuator causes failures such as current leakage and electric breakdown. To overcome the high voltage actuation drawbacks of DE actuators, this paper raises...
Article
Full-text available
High voltage is required for the existing dielectric elastomer (DE) actuators to convert electrical energy to mechanical energy. However, maintaining high voltage on DE membranes can cause various failures, such as current leakage and electrical breakdown, which limits their practical applications, especially in small-scale devices. To overcome the...

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Projects

Projects (2)
Project
To me there are two kinds of soft electromagnetic robots (SEMAs), one is based on hard magnetic particles mixed with elastomer and actuated by a varied electromagnetic field, the other one is made of liquid metal imbedded in an elastomer shell driven by the varied current in the liquid metal in a fixed magnetic field. This project is trying to explore the potential of soft electromagnetic robots by investigating their materials, fabrication, design, control, and applications.