Wrong Region and Bottleneck Analysis of the Self-healing System in Smart Grid

Phototriggered self-healing system with the interconversion of autonomic and non-autonomic self-healing pathways through the control of chain collapse in functional single-chain polymers.

Download Full-text

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.

Download Full-text

The implementation of self-healing system and the optimization of PT setting schemes for 110kV substations in the 110kV chain structure

E3S Web of Conferences ◽

10.1051/e3sconf/202125701030 ◽

2021 ◽

Vol 257 ◽

pp. 01030

Author(s):

Rong Cheng ◽

Linjie Chai ◽

Shiyao Hu ◽

Rong Lin ◽

Jia Guo ◽

...

Keyword(s):

Chain Structure ◽

The Self ◽

Self Healing ◽

Floor Area ◽

Action Logic ◽

Healing System

At present, developed cities such as Shanghai and Beijing, chain structure is mostly used in 110kV grids. There is a controversy for the implementation of the self-healing system and the PT layout scheme. By analyzing the role of self-healing system and its action logic, this paper gives the role of voltage value in the self-healing system. By comparing the reliability, floor area and investment of various PT arrangements, this paper proposes a PT setting recommendation plan, and analyzes the feasibility of the plan.

Download Full-text

Study on Self-Healing Concrete with Pre-Embedded Healing Agent

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.250-253.405 ◽

2011 ◽

Vol 250-253 ◽

pp. 405-408 ◽

Cited By ~ 2

Author(s):

Ming Zhang ◽

Feng Xing ◽

Hong Zhi Cui ◽

Han Lu

Keyword(s):

Civil Engineering ◽

The Self ◽

Self Healing ◽

Research Focus ◽

Technical Problems ◽

Healing System ◽

Healing Agent ◽

Smart Concrete

Self-healing concrete is a kind of smart concrete, and becoming one of research focus both in material and civil engineering field, in the paper, main self-healing methods concluded and partial technical problems of the self-healing facing, aim to these problems designed a kind of novel self-healing system, and experimental analyzed mechanism of self-healing.

Download Full-text

An Autonomic Approach to Enhance Web Application Availability

10.21203/rs.3.rs-31808/v1 ◽

2020 ◽

Author(s):

Hussam N. Fakhouri

Keyword(s):

Operating System ◽

Web Application ◽

Recovery Time ◽

Autonomic Computing ◽

Web Applications ◽

The Self ◽

Software Systems ◽

Self Healing ◽

Healing System ◽

The Web

Abstract Autonomic computing is one of the fascinating features that enable the system to automatically manage itself, diagnose itself, detect the error that cause the failure, then recover and reconfigure the system. The concept of software, systems and web self healing is widely used in many software such as windows operating system which restores and recover tools. Since of the aim of the self healing software feature is to fast recover the application and keep running it and available for 24/7 as optimal as possible then it will a suitable to apply this capability to the web applications to fast recover from any unexpected change that may happen. This paper proposes a self-healing system that monitor, diagnose, check and heal web applications automatically and immediately with unnoticeable recovery time. To test the practical applicability of the proposed methodology, an application has been developed to demonstrate the methodology and apply it for real time web applications. The results of experiments performed on different scenarios demonstrated the ability of the proposed approach to heal web applications and to increase its availability.

Download Full-text

Preparation and Mechanical Properties of Microcapsule-Based Self-Healing Cementitious Composites

Materials ◽

10.3390/ma14174866 ◽

2021 ◽

Vol 14 (17) ◽

pp. 4866

Author(s):

Shiping Jiang ◽

Zhiyang Lin ◽

Can Tang ◽

Wenfeng Hao

Keyword(s):

Mechanical Properties ◽

Compressive Strength ◽

Composite Structures ◽

Healing Time ◽

The Self ◽

Self Healing ◽

Cementitious Composite ◽

Healing System ◽

Cement Based Materials ◽

Curing Agents

Self-healing concrete designs can protect against deterioration and improve durability. However, there is no unified conclusion regarding the effective preparation and mechanical properties of self-healing concrete. In this paper, microcapsules are used in cement-based materials, the reasonable dosage of microcapsules is determined, and the self-healing performance of the microcapsule self-healing system under different curing agents is explored. The microcapsules and curing agent are shown to enhance the flexural and compressive strength of mortar specimens at relatively low contents. The optimal microcapsule content in terms of compressive strength is 1–3%. When the content of the microcapsule reaches 7%, the strength of the specimen decreases by approximately 30%. Sodium fluorosilicate is better-suited to the microcapsule self-healing cement-based system than the other two fluorosilicates, potassium fluorosilicate and magnesium, which have similarly poor healing performance as curing agents. Healing time also appears to significantly influence the microcapsule self-healing system; mortar specimens that healed for 28 days are significantly higher than those that healed for 7 days. This work may provide a valuable reference for the design and preparation of self-healing cementitious composite structures.

Download Full-text

A MICROCAPSULE TECHNOLOGY BASED SELF-HEALING SYSTEM FOR CONCRETE STRUCTURES

Journal of Earthquake and Tsunami ◽

10.1142/s1793431113500140 ◽

2013 ◽

Vol 07 (03) ◽

pp. 1350014 ◽

Cited By ~ 12

Author(s):

BIQIN DONG ◽

NINGXU HAN ◽

MING ZHANG ◽

XIANFENG WANG ◽

HONGZHI CUI ◽

...

Keyword(s):

Urea Formaldehyde ◽

Concrete Structures ◽

The Self ◽

Polymerization Reaction ◽

Formaldehyde Resin ◽

Self Healing ◽

Cementitious Composite ◽

Healing System ◽

Healing Efficiency ◽

Healing Agent

In the study, a novel microcapsule technology based self-healing system for concrete structures has been developed. Through situ-polymerization reaction, the microcapsule is formed by urea formaldehyde resin to pack the epoxy material, which is applied to cementitious composite to achieve self-healing effect. The experimental results revealed that the self-healing efficiency of the composite can be accessed from the recovery of the permeability and strength for the cracked cementitious specimens as the healing agent in the microcapsule acting on the cracks directly. Scanning electronic microscope (SEM/EDX) results show that the epoxy resin is released along with the cracking of the cementitious composite and prevent from cracks continued growth. Further studies show that the self-healing efficiency is affected by the pre-loading of composite, particle size of microcapsule, aging duration of healing agent and so on.

Download Full-text

Fabrication and Property Regulation of Small-Size Polyamine Microcapsules via Integrating Microfluidic T-Junction and Interfacial Polymerization

Materials ◽

10.3390/ma14071800 ◽

2021 ◽

Vol 14 (7) ◽

pp. 1800

Author(s):

Shaochuan Lai ◽

Yongjun He ◽

Daoying Xiong ◽

Yao Wang ◽

Kaibin Xiao ◽

...

Keyword(s):

Interfacial Polymerization ◽

Monomer Concentration ◽

The Self ◽

Self Healing ◽

Core Content ◽

Epoxy Amine ◽

Healing System ◽

Application Potential ◽

Size Restriction ◽

Shell Forming

The self-healing system based on microencapsulated epoxy-amine chemistry is currently the self-healing system with the most practical application potential. It can be widely used in many epoxy-based materials with a size restriction for the microcapsules, such as fiber-reinforced composites, anti-corrosion coatings, etc. Although epoxy microcapsules of different sizes can be fabricated using different techniques, the preparation of polyamine microcapsules with suitable sizes and good performance is the prerequisite for further developing this self-healing system. In this investigation, based on the novel microencapsulation technique via integrating microfluidic T-junction and interfacial polymerization, the feasibility of preparing small-size polyamine microcapsules and the process regulation to optimize the properties of the small-size microcapsules were studied. We show that polyamine microcapsules with sizes smaller than 100 μm can be obtained through the T-junction selection and the feeding rate control of the polyamine. To regulate the small-size microcapsules’ quality, the effects of the concentration of the shell-forming monomer and the solvent with different polarity in the reaction solution and the reaction condition were studied. It shows that dry, free-flowing small-size microcapsules can still be obtained when the shell-forming monomer concentration is higher and the solvent’s polarity is lower, compared with the preparation of larger polyamine microcapsules. Although the change of reaction conditions (reaction temperature and duration) has a certain effect on the microcapsules’ effective core content, it is relatively small. The results of this investigation further promote the potential application of the self-healing systems based on microencapsulated epoxy-amine chemistry in materials with a size restriction for the microcapsules.

Download Full-text