scholarly journals A study on the wetting properties of broccoli leaf surfaces and their time dependent self-healing after mechanical damage

Soft Matter ◽  
2018 ◽  
Vol 14 (38) ◽  
pp. 7782-7792 ◽  
Author(s):  
Benjamin B. Rich ◽  
Boaz Pokroy
Keyword(s):  
Surface Roughness ◽  
Mechanical Damage ◽  
The Self ◽  
Time Dependent ◽  
Self Healing ◽  
Wetting Properties ◽  
Leaf Surfaces

This paper reports the self-healing of broccoli leaves after mechanical damage; connecting recovery of surface roughness to the wetting properties.

Visualization of the self-healing process by directly observing the evolution of fluorescence intensity

2021 ◽  
Author(s):  
Qiaoqiao Shen ◽  
Hui Liu ◽  
Yan Peng ◽  
Jing Zheng ◽  
Jinrong Wu
Keyword(s):  
Fluorescence Intensity ◽  
Healing Process ◽  
Mechanical Damage ◽  
The Self ◽  
Self Healing ◽  
Subtle Change ◽  
Hydrogen Bonded

A fluorophore (TC1) with strong aggregation-caused quenching (ACQ) effect was incorporated into a self-healing elastomer with a dynamic hydrogen-bonded network, the subtle change induced by mechanical damage and self-healing could be detected by CLSM.

scholarly journals Self-healable soft shield for γ-ray radiation based on polyacrylamide hydrogel composites

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Jinwoo Park ◽  
Minseok Kim ◽  
Sooseok Choi ◽  
Jeong-Yun Sun
Keyword(s):  
Gamma Ray ◽  
Lead Dioxide ◽  
Mechanical Damage ◽  
Radiation Shielding ◽  
The Self ◽  
Self Healing ◽  
High Attenuation ◽  
Covalent Crosslinking ◽  
Healing Efficiency ◽  
Hydrogel Composites

AbstractWith the growing risk of radiation exposure, there are growing interests in radiation shielding. Because most radiation shields are made from heavy metals, a need to develop a soft shield is raised to protect human body. However, because the shield can easily undergo a mechanical damage by an impact, it would be better to have self-repairing system in the shield. Here, we have fabricated an intrinsic self-healable soft shield for gamma ray by making acrylamide based hydrogel composite. The composite contains lead dioxide nanoparticles for gamma ray shielding and Laponite clays for self-repairing. Although the hydrogel contained a large amount of lead dioxide nanoparticles (3.23 M), the fabricated composites stretched beyond 1400% while showing a high attenuation coefficient of 0.1343 cm−1 against gamma ray from a cobalt-60 source. Then a systematic study was performed to analyze self-healing properties and the 96.55% of maximum self-healing efficiency was obtained. We also analyzed a storage modulus of hydrogel and molecular weight of polyacrylamide to study an effect of gamma ray on the self-healing. The self-healing efficiency was decreased by a gamma ray because the radiation induces scissioning or covalent crosslinking in the chains.

Self Healing of Mechanical Damage in Metallic Materials

2008 ◽  
Vol 54 ◽  
pp. 152-157 ◽  
Author(s):  
Norio Shinya
Keyword(s):  
Fatigue Crack ◽  
Low Cost ◽  
Mechanical Damage ◽  
The Self ◽  
Self Healing ◽  
Metallic Materials ◽  
Creep Cavity ◽  
Actual Service ◽  
Solute Atoms

Long term service of the materials under stresses and at attacking environments causes material damages, leading to fractures. Among a lot of the material damages, creep cavity and fatigue crack are principal targets to be self healed autonomously during actual service of materials. Since the creep cavity and the fatigue crack are generally too fine to be detected during actual service and difficult to be repaired at the service sites. Recently self healing of creep cavity and fatigue crack has been developed. In the developed methods, segregation and precipitation of solute atoms were applied to self healing of the damages. The self healing methods are comparatively simple and low cost, which may make it easy to be applied to many materials.

scholarly journals In-depth characterization of self-healing polymers based on π–π nteractions

2021 ◽  
Vol 17 ◽  
pp. 2496-2504
Author(s):  
Josefine Meurer ◽  
Julian Hniopek ◽  
Johannes Ahner ◽  
Michael Schmitt ◽  
Jürgen Popp ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Mechanical Damage ◽  
Analytical Techniques ◽  
The Self ◽  
Supramolecular Interactions ◽  
Supramolecular Polymers ◽  
Self Healing ◽  
Noncovalent Bonds ◽  
Tetracarboxylic Dianhydride

The self-healing behavior of two supramolecular polymers based on π–π-interactions featuring different polymer backbones is presented. For this purpose, these polymers were synthesized utilizing a polycondensation of a perylene tetracarboxylic dianhydride with polyether-based diamines and the resulting materials were investigated using various analytical techniques. Thus, the molecular structure of the polymers could be correlated with the ability for self-healing. Moreover, the mechanical behavior was studied using rheology. The activation of the supramolecular interactions results in a breaking of these noncovalent bonds, which was investigated using IR spectroscopy, leading to a sufficient increase in mobility and, finally, a healing of the mechanical damage. This scratch-healing behavior was also quantified in detail using an indenter.

scholarly journals Effect of fly ash on the self-healing capability of cementitious materials with crystalline admixture under different conditions

AIP Advances ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 075018
Author(s):  
Xi Wang ◽  
Hao Qiao ◽  
Ziwei Zhang ◽  
Shiying Tang ◽  
Shengjun Liu ◽  
...  
Keyword(s):  
Fly Ash ◽  
Cementitious Materials ◽  
The Self ◽  
Self Healing

scholarly journals The Effect of Superabsorbent Polymers on the Microstructure and Self-Healing Properties of Cementitious-Based Composite Materials

2021 ◽  
Vol 11 (2) ◽  
pp. 700
Author(s):  
Irene A. Kanellopoulou ◽  
Ioannis A. Kartsonakis ◽  
Costas A. Charitidis
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
Hybrid Structure ◽  
The Self ◽  
Self Healing ◽  
Cementitious Composite ◽  
Superabsorbent Polymers ◽  
Porosity Reduction ◽  
Environment Control ◽  
The Impact

Cementitious structures have prevailed worldwide and are expected to exhibit further growth in the future. Nevertheless, cement cracking is an issue that needs to be addressed in order to enhance structure durability and sustainability especially when exposed to aggressive environments. The purpose of this work was to examine the impact of the Superabsorbent Polymers (SAPs) incorporation into cementitious composite materials (mortars) with respect to their structure (hybrid structure consisting of organic core—inorganic shell) and evaluate the microstructure and self-healing properties of the obtained mortars. The applied SAPs were tailored to maintain their functionality in the cementitious environment. Control and mortar/SAPs specimens with two different SAPs concentrations (1 and 2% bwoc) were molded and their mechanical properties were determined according to EN 196-1, while their microstructure and self-healing behavior were evaluated via microCT. Compressive strength, a key property for mortars, which often degrades with SAPs incorporation, in this work, practically remained intact for all specimens. This is coherent with the porosity reduction and the narrower range of pore size distribution for the mortar/SAPs specimens as determined via microCT. Moreover, the self-healing behavior of mortar-SAPs specimens was enhanced up to 60% compared to control specimens. Conclusively, the overall SAPs functionality in cementitious-based materials was optimized.

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