Robotic Manipulation under Harsh Conditions Using Self‐Healing Silk‐Based Iontronics (Adv. Sci. 2/2022)

Mengwei Liu; Yujia Zhang; Yanghong Zhang; Zhitao Zhou; Nan Qin; Tiger H. Tao

doi:10.1002/advs.202270013

Self-Healing of Concrete Cracks by Ceramsite-Loaded Microorganisms

Advances in Materials Science and Engineering ◽

10.1155/2018/5153041 ◽

2018 ◽

Vol 2018 ◽

pp. 1-8 ◽

Cited By ~ 11

Author(s):

Jing Xu ◽

Xianzhi Wang ◽

Junqing Zuo ◽

Xiaoyan Liu

Keyword(s):

Heat Treatment ◽

Compressive Strength ◽

Heating Temperature ◽

Concrete Strength ◽

The Self ◽

Self Healing ◽

Healing Efficiency ◽

Maximum Crack ◽

Harsh Conditions ◽

Urea Decomposition

Protective carrier is essential for the self-healing of concrete cracks by microbially induced CaCO3 precipitation, owing to the harsh conditions in concrete. In this paper, porous ceramsite particles are used as microbial carrier. Heat treatment and NaOH soaking are first employed to improve the loading content of the ceramsite. The viability of bacterial spores is assessed by urea decomposition measurements. Then, the self-healing efficiency of concrete cracks by spores is evaluated by a series of tests including compressive strength regain, water uptake, and visual inspection of cracks. Results indicate that heat treatment can improve the loading content of ceramsite while not leading to a reduction of concrete strength by the ceramsite addition. The optimal heating temperature is 750°C. Ceramsite particles act as a shelter and protect spores from high-pH environment in concrete. When nutrients and spores are incorporated in ceramsite particles at the same time, nutrients are well accessible to the cells. The regain ratio of the compressive strength increases over 20%, and the water absorption ratio decreases about 30% compared with the control. The healing ratio of cracks reaches 86%, and the maximum crack width healed is near 0.3 mm.

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Boronic Ester-Polyurethane as a Self-Healing Coating Material for Offshore Top Side Structures Application

10.2118/208213-ms ◽

2021 ◽

Author(s):

Mohd Shamsul Farid Samsudin ◽

Norfarah Diana Aba ◽

Muzdalifah Zakaria ◽

Azmi Mohammed Nor ◽

Russell Varley ◽

...

Keyword(s):

Mechanical Performance ◽

Coating Layer ◽

Salt Spray ◽

The Self ◽

Self Healing ◽

Humidity Level ◽

Healing System ◽

Healing Efficiency ◽

Harsh Conditions

Abstract Polymer coatings, especially epoxy and polyurethane paint systems, have been widely used to prevent corrosion of metallic components and structures. However, due to environmental and mechanical effects, the barrier efficiency of the coatings may be substantially compromised during transportation and service, as demonstrated by localized scratches, delamination, or stress-related microcracks. Application of a self-healing coating that can restore damages and recover its performance with minimal external intervention could prevent corrosion at the damaged coating. In this present work, the healing efficiency and long-term durability of Boronic Ester (BE) blended with Polyurethane (PU) as a self-healing system for top side coating of offshore platform structures was investigated. The BE was mixed at a ratio of 50:50 with PU resin and applied as a top layer on a PU coated steel plate with a thickness of approximately 300-350 μm. The healing efficiency, mechanical performance, and durability under simulated environmental conditions such as salt spray and UV were investigated according to the related ASTM standards. As a first step, the electrical impedance spectroscopy (EIS) and 3D profilemeter microscope were used to assess the healing ability of the scratched coating at room temperature and humidity level of 85 %. The mechanical performance of the self-healing coating layer was evaluated using a pull off adhesion test to investigate the compatibility of the self-healing system with the existing commercial PU topcoat system, while a long term 3000 hours salt spray and 4200 hours cyclic UV test were performed to evaluate the self-healing coating's durability in harsh conditions. Preliminary assessment using EIS and 3D profilemeter microscopes on the scratched PU/BE self-healing coating revealed significant healing efficiency of more than 80% for healing condition at ambient temperature and humidity level of 85%. The self-healing coating layer also demonstrated excellent adhesion efficiency, with adhesion greater than 300 psi suggesting good compatibility of the BE-PU layer with commercial PU coating. The salt spray and cyclic UV tests that were performed to determine the durability of the self-healing coating revealed that the 50BE/50PU layer remained intact and exhibited good healing performance with more than 80% efficiency even after exposure to harsh conditions. The findings from the study demonstrated that the BE/PU material has the potential to be used as a self-healing system for topside coating of offshore platforms structures, thereby lowering maintenance costs.

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Bioconcrete Development Using Calcite -Precipitating Bacteria Isolated From Different Sources in Jordan

MATEC Web of Conferences ◽

10.1051/matecconf/201927801011 ◽

2019 ◽

Vol 278 ◽

pp. 01011

Author(s):

Suha M. Abudoleh ◽

Amal Al Mahayreh ◽

Aya Al Frejat ◽

Fatima Al Hulaisy ◽

Sara O. Hamdan

Keyword(s):

Cement Mortar ◽

Construction Material ◽

Negative Control ◽

Self Healing ◽

Test Results ◽

Promising Technique ◽

Sealing Material ◽

Fava Beans ◽

Harsh Conditions ◽

Different Sources

Concrete is considered as the most widely used construction material in the world. However, concrete is exposed to cracks due to different factors like overloads, temperature, shrinkage, earthquakes and others. These cracks reduce the strength, the service life of the structure, and increase the permeability of the concrete. Thus, the importance of "self-healing concrete" is highlighted nowadays, with emphasis on a special type of concrete called bioconcrete, which is a concrete that has the ability to self-heal the microcracks that happen due to overloads. This ability comes from the bacteria used in the concrete mix which have special characteristics such as the ability to live in harsh conditions similar to those found in the concrete environment, in addition to their ability to precipitate calcite (calcium carbonate (CaCO3)), the sealing material in the cracks. This study aims to assess the performance of self-healing Bacillus mycoides incorporated into Portland cement mortar. This bacterium has been isolated from the soil of Fava beans in Jordan. Cracking of specimens was induced by load percent concept after 7 days of curing and tests were performed at 21 days of cracking. The testing scheme for the mortar included bacterial sporulation tests inside mortar specimens, acid fizz test and a compression test. Results demonstrated that self-healing bacteria is a promising technique in minimizing cracking. The rate of healing using bacteria was higher than the bacteria-free negative control.

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Inorganic adhesives for robust, self-healing, superhydrophobic surfaces

Journal of Materials Chemistry A ◽

10.1039/c7ta06001g ◽

2017 ◽

Vol 5 (36) ◽

pp. 19297-19305 ◽

Cited By ~ 61

Author(s):

Mingming Liu ◽

Yuanyuan Hou ◽

Jing Li ◽

Lu Tie ◽

Yubing Peng ◽

...

Keyword(s):

Water Treatment ◽

Plasma Etching ◽

Boiling Water ◽

Superhydrophobic Surfaces ◽

Self Healing ◽

Harsh Conditions

Inorganic adhesives are presented to construct robust, self-healing, superhydrophobic surfaces. The surfaces maintain superhydrophobicity after physical abrasion, and still show excellent mechanical robustness after treatment under harsh conditions. They also have a rapid self-healing ability against boiling-water treatment, O2-plasma etching, and amphiphilic pollution.

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Robot-Assisted Glovebox Teleoperation for Nuclear Industry

Robotics ◽

10.3390/robotics10030085 ◽

2021 ◽

Vol 10 (3) ◽

pp. 85

Author(s):

Ozan Tokatli ◽

Pragna Das ◽

Radhika Nath ◽

Luigi Pangione ◽

Alessandro Altobelli ◽

...

Keyword(s):

Material Handling ◽

Extreme Environments ◽

Nuclear Material ◽

Nuclear Industry ◽

Robotic Manipulation ◽

Robotic Systems ◽

Problem Statement ◽

Robot Assisted ◽

The World ◽

Harsh Conditions

The nuclear industry has some of the most extreme environments in the world, with radiation levels and extremely harsh conditions restraining human access to many facilities. One method for enabling minimal human exposure to hazards under these conditions is through the use of gloveboxes that are sealed volumes with controlled access for performing handling. While gloveboxes allow operators to perform complex handling tasks, they put operators at considerable risk from breaking the confinement and, historically, serious examples including punctured gloves leading to lifetime doses have occurred. To date, robotic systems have had relatively little impact on the industry, even though it is clear that they offer major opportunities for improving productivity and significantly reducing risks to human health. This work presents the challenges of robotic and AI solutions for nuclear gloveboxes, and introduces a step forward for bringing cutting-edge technology to gloveboxes. The problem statement and challenges are highlighted and then an integrated demonstrator is proposed for robotic handling in nuclear gloveboxes for nuclear material handling. The proposed approach spans from tele-manipulation to shared autonomy, computer vision solutions for robotic manipulation to machine learning solutions for condition monitoring.

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Autonomous self-healing polyisoprene elastomers with high modulus and good toughness based on the synergy of dynamic ionic crosslinks and highly disordered crystals

Polymer Chemistry ◽

10.1039/d0py01034k ◽

2020 ◽

Vol 11 (41) ◽

pp. 6549-6558

Author(s):

Yohei Miwa ◽

Mayu Yamada ◽

Yu Shinke ◽

Shoichi Kutsumizu

Keyword(s):

Mechanical Properties ◽

Room Temperature ◽

Self Healing ◽

High Modulus ◽

Disordered Crystals ◽

Ionic Crosslinks

We designed a novel polyisoprene elastomer with high mechanical properties and autonomous self-healing capability at room temperature facilitated by the coexistence of dynamic ionic crosslinks and crystalline components that slowly reassembled.

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