Publications by authors named "Mingtong Li"

7 Publications

  • Page 1 of 1

Effect of body stiffness distribution on larval fish-like efficient undulatory swimming.

Sci Adv 2021 May 5;7(19). Epub 2021 May 5.

Physical Intelligence Department, Max Planck Institute for Intelligent Systems, 70569 Stuttgart, Germany.

Energy-efficient propulsion is a critical design target for robotic swimmers. Although previous studies have pointed out the importance of nonuniform body bending stiffness distribution () in improving the undulatory swimming efficiency of adult fish-like robots in the inertial flow regime, whether such an elastic mechanism is beneficial in the intermediate flow regime remains elusive. Hence, we develop a class of untethered soft milliswimmers consisting of a magnetic composite head and a passive elastic body with different These robots realize larval zebrafish-like undulatory swimming at the same scale. Investigations reveal that uniform and high swimming frequency (60 to 100 Hz) are favorable to improve their efficiency. A shape memory polymer-based milliswimmer with tunable on the fly confirms such findings. Such acquired knowledge can guide the design of energy-efficient leading edge-driven soft undulatory milliswimmers for future environmental and biomedical applications in the same flow regime.
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http://dx.doi.org/10.1126/sciadv.abf7364DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8099186PMC
May 2021

In-air fast response and high speed jumping and rolling of a light-driven hydrogel actuator.

Nat Commun 2020 08 10;11(1):3988. Epub 2020 Aug 10.

Physical Intelligence Department, Max Planck Institute for Intelligent Systems, 70569, Stuttgart, Germany.

Stimuli-responsive hydrogel actuators have promising applications in various fields. However, the typical hydrogel actuation relies on the swelling and de-swelling process caused by osmotic-pressure changes, which is slow and normally requires the presence of water environment. Herein, we report a light-powered in-air hydrogel actuator with remarkable performances, including ultrafast motion speed (up to 1.6 m/s), rapid response (as fast as 800 ms) and high jumping height (~15 cm). The hydrogel is operated based on a fundamentally different mechanism that harnesses the synergetic interactions between the binary constituent parts, i.e. the elasticity of the poly(sodium acrylate) hydrogel, and the bubble caused by the photothermal effect of the embedded magnetic iron oxide nanoparticles. The current hydrogel actuator exhibits controlled motion velocity and direction, making it promising for a wide range of mobile robotics, soft robotics, sensors, controlled drug delivery and other miniature device applications.
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http://dx.doi.org/10.1038/s41467-020-17775-4DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7417580PMC
August 2020

Low-Cost, Robust Pressure-Responsive Smart Windows with Dynamic Switchable Transmittance.

ACS Appl Mater Interfaces 2020 Apr 19;12(13):15695-15702. Epub 2020 Mar 19.

Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, Jiangsu 215123, China.

Mechanically responsive smart windows with adjustable light transmittance have attracted more and more attention due to their great potential in our daily life. However, their fabrication normally requires complicated preparation such as oxygen plasma treatment and high-cost materials (i.e., poly(dimethylsiloxane) (PDMS)), which hinders their practical applications. Herein, a principally different mechanically responsive smart window, i.e., a pressure-responsive smart window, is reported, which is achieved by harnessing the synergistic interactions (i.e., hydrogen bonding and surface roughness compensation) between the two constituent parts, i.e., hydrogel and agar films. The pressure-responsive smart window features the ultrafast response time (37.5 ms) and high transmittance changes (∼50%) with excellent repeatability, which can be stained with different colors and operated on a flexible substrate. Since the pressure-responsive smart window enables the utilization of the low-cost material and does not require the external energy input, it is anticipated that it may have great potential in practical applications.
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http://dx.doi.org/10.1021/acsami.0c00300DOI Listing
April 2020

Enhances Lignin Synthesis in 'Whangkeumbae' Pear () 'Hard-End' Fruit.

Molecules 2019 Nov 27;24(23). Epub 2019 Nov 27.

College of Horticulture, Qingdao Agricultural University, No. 700 Changcheng Road, Chengyang, Qingdao 266109, China.

A disorder in pears that is known as 'hard-end' fruit affects the appearance, edible quality, and market value of pear fruit. RNA-Seq was carried out on the calyx end of 'Whangkeumbae' pear fruit with and without the hard-end symptom to explore the mechanism underlying the formation of hard-end. The results indicated that the genes in the phenylpropanoid pathway affecting lignification were up-regulated in hard-end fruit. An analysis of differentially expressed genes (DEGs) identified three NAC transcription factors, and RT-qPCR analysis of , , and confirmed that gene expression was correlated with the hard-end disorder in pear fruit. A transient increase in was observed in the calyx end of 'Whangkeumbae' fruit when they began to exhibit hard-end symptom. Concomitantly, the higher level of and transcripts was observed, which are the key genes in lignin biosynthesis. Notably, lignin content in the stem and leaf tissues of transgenic tobacco overexpressing was significantly higher than in the control plants that were transformed with an empty vector. Furthermore, transgenic tobacco overexpressing had a larger number of xylem vessel elements. The results of this study confirmed that functions in inducing lignification in pear fruit during the development of the hard-end disorder.
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http://dx.doi.org/10.3390/molecules24234338DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6930614PMC
November 2019

Overexpression of Pear () in Tomato Affects Lignin Content.

Molecules 2019 Jul 17;24(14). Epub 2019 Jul 17.

College of Horticulture, Qingdao Agricultural University, 700 Changcheng Road, Chengyang, Qingdao City 266109, China.

was originally isolated from the 'Wangkumbae' pear ( Nakai), and it encodes for cinnamyl alcohol dehydrogenase (CAD), which is a key enzyme in the lignin biosynthesis pathway. In order to verify the function of , transgenic tomato () 'Micro-Tom' plants were generated using over-expression constructs via the agrobacterium-mediated transformation method. The results showed that the over-expression transgenic tomato plant had a strong growth vigor. Furthermore, these over-expression transgenic tomato plants contained a higher lignin content and CAD enzymatic activity in the stem, leaf and fruit pericarp tissues, and formed a greater number of vessel elements in the stem and leaf vein, compared to wild type tomato plants. This study clearly indicated that overexpressing increased the lignin deposition of transgenic tomato plants, and thus validated the function of in lignin biosynthesis.
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http://dx.doi.org/10.3390/molecules24142595DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6680972PMC
July 2019

One-Step Fabrication of Dual Optically/Magnetically Modulated Walnut-like Micromotor.

Langmuir 2019 Feb 11;35(7):2801-2807. Epub 2019 Feb 11.

Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices , Soochow University , Suzhou , Jiangsu 215123 , P. R. China.

In this paper, we report a novel multi-responsive walnut-like micromotor consisting of polycaprolactone (PCL), iron oxide nanoparticles (FeO NPs), and catalase, which is constructed through a one-step electrospinning method. Based on the catalytic activity and photothermal and magnetic responsiveness originating from catalase and FeO NPs, respectively, the resulting micromotor exhibits an autonomous movement in the presence of hydrogen peroxide (HO) fuel, controlled motion velocity under light irradiation, and guided movement direction upon the application of an external magnetic field. Owing to the hydrophobic nature of the PCL polymer constituent inside the micromotor, the autonomous moving micromotor can collect spilled oil inside a solution once it collides with the oil droplet. Since the micromotor could be separated out using a magnetic field, we believe the current walnut-like micromotor holds great promise in the field of environmental remediation.
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http://dx.doi.org/10.1021/acs.langmuir.8b02904DOI Listing
February 2019

Shape-Controlled Fabrication of the Polymer-Based Micromotor Based on the Polydimethylsiloxane Template.

Langmuir 2015 Nov 22;31(43):11914-20. Epub 2015 Oct 22.

Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices and Collaborative Innovation Center (CIC) of Suzhou Nano Science and Technology, Soochow University , Suzhou, Jiangsu 215123, P. R. China.

We report the utilization of the polydimethylsiloxane template to construct polymer-based autonomous micromotors with various structures. Solid or hollow micromotors, which consist of polycaprolactone and platinum nanoparticles, can be obtained with controllable sizes and shapes. The resulting micromotor can not only be self-propelled in solution based on the bubble propulsion mechanism in the presence of the hydrogen peroxide fuel, but also exhibit structure-dependent motion behavior. In addition, the micromotors can exhibit various functions, ranging from fluorescence, magnetic control to cargo transportation. Since the current method can be extended to a variety of organic and inorganic materials, we thus believe it may have great potential in the fabrication of different functional micromotors for diverse applications.
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http://dx.doi.org/10.1021/acs.langmuir.5b03649DOI Listing
November 2015