Self-healing Concept Research Articles

Alicyclic Polyimide With Multiple Breakdown Self-Healing Based on Gas-Condensation Phase Validation for High Temperature Capacitive Energy Storage.

Polymer dielectrics with combined thermal stability and self-healing properties are specifically desired for high-temperature film capacitors. The high thermal stability of conventional polymers benefits from the abundance of aromatic rings in the molecule backbone, but the high carbon content sacrifices their self-healing properties. Here, analicyclic polyimide with a high glass transition temperature (256°C) and wide energy bandgap (4.58eV) is designed, which exhibits electric conductivity more than an order of magnitude lower than that of classical polyimide at high electric fields and high temperatures. As a result, alicyclic polyimide achieves a discharged energy density of 4.54 Jcm-3 and a charge-discharge efficiency of above 90% at 200°C, which is superior to existing dielectric polymers and composites. The alicyclic polyimide benefits from a low pyrolytic residual carbon rate, retaining 93% of the dielectric breakdown strength after four electrical breakdown cycles. Distinguishing from the current condensed-phase self-healing concept, for the first time, exploring the self-healing capability of high-temperature polyimide dielectric is presented based on dual self-healing mechanisms of gas-phase and condensed-phase. The high energy density at high temperatures and the superior self-healing capability of alicyclic polyimide further indicate the promise of polyimide dielectric film capacitors for extreme conditions.

Recent advancements in self-healing materials and their application in coating industry

Self-healing polymers (SHP), inspired by nature, are materials that have the ability to recover themselves from various physical damages in the presence of different inducing environments. The self-recovering property indicates the capability to heal the cracks in their very nascent stage at their micro or nano-level size and provides a door to prevent them from any major catastrophic failure. In this article, a comprehensive review with updated reported work on various types of self-healing mechanisms and their advantages and limitations has been discussed, along with their applications. The main focus of the review has been aligned with the challenges and future scopes associated with the exploration of self-healing concepts for industrial coating applications. The different extrinsic, intrinsic, and combined healing mechanisms have been explained, along with their application in coating. Finally, the recent status of healing technology and future research trends has been discussed in this review article.

An Application of Self-Healing Clear Coat

The self-healing concept for an acrylic polymer was investigated. In the study, the self-healing performance of the developed varnish was examined. Varnish used; It is a two-component, solvent-based, hydroxylated acrylic resin-based varnish. An isocyanate-based hardener was used as the second component.To demonstrate self-healing performance; Varnish mixed with hardener and thinner in appropriate mixing ratio was applied to the surface with a spray gun. Deformation was created on the varnish, which was cured at 80°C for 30 minutes, and the self-healing performance of this deformation was monitored by gloss measurements.At the end of the study, it was determined that the varnish developed could self-heal at a rate of 90%.

Self-Healing Transparent Poly(dimethyl)siloxane with Tunable Mechanical Properties: Toward Enhanced Aging Materials for Space Applications.

When exposed to the geostationary orbit, polymeric materials tend to degrade on their surface due to the appearance of cracks. Implementing the self-healing concept in polymers going to space is a new approach to enhancing the lifespan of materials that cannot be replaced once launched. In this study, the elaboration of autonomous self-healing transparent poly(dimethylsiloxane) (PDMS) materials resistant to proton particles is presented. The PDMS materials are functionalized with various compositions of urea and imine moieties, forming dynamic covalent and/or supramolecular networks. The hydrogen bonds induced by the urea ensure the formation of a supramolecular network, while the dynamic covalent imine bonds are capable of undergoing exchange reactions. Materials with a broad range of mechanical properties were obtained depending on the composition and structure of the PDMS networks. As coating applications in a spatial environment were mainly targeted, the surface properties of the polymer are essential. Thus, percentages of scratch recovery were determined by AFM. From these data, self-healing kinetics were extracted and rationalized based on the polymer structures. The obtained data were in good agreement with the relaxation times determined by rheology in stress relaxation experiments. Moreover, the accelerated aging of materials under proton irradiation, simulating a major part of the geostationary environment, revealed a strong limitation or disappearance of cracks while keeping the transparency of the PDMS. These promising results open routes to prepare new flexible autonomous polymeric materials for space applications.

Development the self-healing concept for well cement support integrity maintenance. Theory and practice

Oftentimes oil and gas wells can be affected to various technological as well as chemical and natural stresses. Perforations, fracturing, side tracking from under the casings shoe, formation integrity testings all these lead to the cement sheath fragility and the annulus integrity deterioration causing the emergence of net of cracks in the cement sheath, which contribute to nascence of behind-the-casing flows.
 World statistics say that the issues of casing string-borehole annulus unsealing prevention, as well as the effective restoration of the cement sheath integrity in the presence of a wide range of water-shutoff materials and technologies for inflows bounding, do still remain open and require non-standard solutions. In this connection, the development of “self-healing” plugging material, which allows the cement stone to independently regenerate its integrity, thereby excluding technological shutdowns and the intervention of repair equipment, is one of the highest priority tasks and promising methods for eliminating behind-the-casing flows, accompanied by restoring the integrity of the well cement sheath. An advanced alternative to the traditional plugging material is elaboration of "self-healing" cements, which is hopeful in the line of the above-mentioned peculiarities.

The application of self-healing concept in Ni superalloys: Theoretical design and experimental validation

The self-healing mechanism has been newly applied in Ni superalloys to extend the creep lifetime during service. Quantitative selection criteria are proposed to screen the potential self-healing elements in Ni alloying system. Ti atoms and η-Ni3Ti precipitates are thus selected as the candidate healing atoms and the healing agent, respectively. The ideal composition interval for Ti to achieve the effective healing effects is computationally calculated as 0.076–0.1 mol fraction. On this basis, SHNi (self-healing Ni alloy) has been developed and compared with nSHNi (no self-healing Ni alloy). The creep lifetimes of SHNi alloys are observed 8–10 times higher than that of nSHNi alloys. Microstructure characterizations have shown that η-Ni3Ti healing agents in SHNi alloys can form site-specifically at the cavity sites during service. Meanwhile, the creep cavities in SHNi alloys present much smaller average sizes during creep, and the cavity growth rates are generally one magnitude lower compared to that of nSHNi alloys. The excellent creep properties of SHNi alloys can be well ascribed to their creep cavitation resistance brought by the self-healing behavior. The effectiveness of self-healing mechanism in improving the creep properties has proposed a new strategy in developing novel Ni superalloys.

Self-Healing Performance of Carbon Fibre Reinforced Composite Containing Microcapsules under Tensile Load

Self-healing is fascinating research due to its distinctiveness in automatically mending the damages. A great deal of work has been done using the self-healing concept in polymers. However, there is limited research on fibre reinforced polymer composites. Adding microcapsules during fabrication of the composites is one of the methods which is capable of carrying out the healing of damage autonomously. This research work takes into account the preparation of fibre reinforced composites with incorporation of two types of microcapsules i.e., healing agent carriers and curing agent carriers in the course of fabrication to mend the damages generated. The work experiments the impact of inclusion of microcapsules on the tensile properties of host composite laminate. Results of tensile tests indicate that a significant amount of tensile strength of the specimens was restored by healing and curing agents present in microcapsules. The healing efficiency was observed as 61.3%. It has also been noted that, the presence of these capsules does not significantly alter the original performance of the laminate as the effect of capsule inclusion on properties of the laminate is negligible.

A review of the recent development in self-healing rubbers and their quantification methods

The emerging self-healing concept in rubber materials appears to be a good option for reducing rubber waste since it can enhance the longevity of the product's structure in conjunction with standard development goals to ensure sustainable consumption and efficient use of resources. Self-healing elastomers are fabricated to heal cracks and damage both at the micro and macroscopic levels to restrict failure by incorporating healing agents extrinsically or intrinsically. The major successful techniques to fabricate self-healing rubber were reviewed. The review also focuses on testing and analysis methods to understand the healing phenomena and quantification methods to measure the healing performance. The review also includes an overview of the self-healing elastomers for tyre applications.

Bio-concrete: Unveiling self-healing properties beyond crack-sealing

Do microbes categorically heal the cracks in concrete or only seal the cracks - this study aims to answer, based on a few experimental findings, highlighting the self-healing concepts in cement-based materials. Alkaliphilic spore-forming Bacillus cohnii microbes (105-1010 cells/ml) are used in the cement-concrete (bio-concrete) in addition to varying nutrient amounts. The healing in the form of regaining its structural efficiency is evaluated by its mechanical (compressive, flexural) strength and durability properties. Bio-mineralized calcium carbonate seals 37% of 20–50 nm dimensioned pores and 87% of 50–200 nm dimensioned pores resulting in 43–48% total voids reduction within 28 days of the healing period. Microbes only degrade the nutrients to precipitate healing agents (calcium carbonate) without affecting the C–S–H structure in concrete. Statistical analysis reveals that calcite deposition mostly influences the strength of self-healed bio-concrete whereas experimental findings show 5.8–6.3 wt% calcium carbonate deposition augments the 40–60% compressive strength of bio-concrete compared to reference concrete. The complete-to-60% sealing of cracks of 0.02–2 mm width is examined using visual inspection of concrete skins. Microbes reduce porosity, sealing cracks intensifies mechanical strength, and the durability of the concrete validates self-healing rather than only sealing the cracks.

The Concept Of Self Healing For Children In Islamic Education (Perspective Of The Qur'an And Hadits)

<em>Recently, mental health has been frequently discussed because the number of mental disorders in Indonesia has increased significantly in each period. Considering that alternative medicine is rarely used due to the rapid development of the times, this research has the aim of opening up people's thinking about alternative medicine, one of which is the Al-Qur'an. This research is a library research by analyzing several sources such as books, scientific articles and others. The independent variable in this study is self-healing, while the dependent variable is self-healing from the perspective of the Qur'an and Hadith.</em><em>In the span of 14 centuries, healing with the Qur'an has become something that is well known to Muslims. They treat all diseases with the Qur'an because they believe in the word of Allah SWT related to healing. In fact, onIn a history it is explained that the Prophet Muhammad once did ruqyah himself when he was sick by reading the letter al-Mu'awwidhatain, namely the letter al-Falaq and the letter an-Nas. Further research can be carried out by studying several surahs, certain verses which are believed by Muslims to be very effective medicines for various diseases, especially mental illnesses</em>

DYNAMIC REVERSIBLE NETWORKS AND DEVELOPMENT OF SELF-HEALING RUBBERS: A CRITICAL REVIEW

ABSTRACT An intensive literature search shows that research in the field of self-healing rubbers is still in its infancy. By analyzing the various reviews and reports available, most of the results prove to be complicated; however, a few studies show promising self-healing properties of new elastomers. Most of these materials were prepared by relatively sophisticated chemical syntheses. Many of the studies on self-healing materials also deal with commercial rubbers, but the mechanical performance of these self-healing systems is very poor for practical application, perhaps because self-healing systems are usually prepared with an uncured or pseudo-crosslinked matrix structure. The poor mechanical properties are related to the highly viscous but inelastic nature of the uncured or only partially cured rubber compound. Importantly, most of the studies have been conducted on rubber systems without reinforcing fillers. For filler-reinforced rubber systems, the question is whether the working principle of reversible bonds is applicable. This literature review attempted to compile the current promising self-healing systems, describe their underlying chemical mechanisms, and discuss the self-healing concept from a thermodynamic perspective. In addition, this review is focused on the critical discussion of the principle and origin of self-healing behavior and finally draws conclusions on the applications and opportunities for further developments in this field.

Vedix an Ayurvedic Website

Abstract: Today human beings are suffering from many challenges such as traits or diseases. Each year various diseases, viruses, and fungal infestation lead to fatalities. Ayurveda is a traditional system of medicine that comes from ancient India; it is based on the idea of balance within all bodily systems. The word Ayurveda comes from the Sanskrit words Ayur (life) and Veda (to know), making it the ‘science of life’. Ayurveda employs diet, herbal treatment, and yogic breathing techniques to restore mental, physical, and spiritual health. Ayurveda is one of the few ancient systems of medicine that is still widely practiced in modern times. The Ayurveda, the traditional Indian medicinal system remains the most ancient yet living tradition with a sound philosophical and experimental basis. It is a science of life with a holistic approach to health and personalized medicine. It is known to be a complete medical system that comprised physical, psychological, philosophical, ethical, and spiritual health.[1] The Ayurveda is the self-healing concept, the use of herbal treatment is equally important in this Indian traditional system of medicine.

Self-Healing Concept in The Quran: An Analysis of Sakana and Ithma'anna Words

Self-healing term is widely used by the youth generation lately in the cyber and real world. People comprehend the term as the effort to heal oneself from heart discomfort caused by a failure, pressure, anxiety, disappointment, insecurity, et cetera, and the effort to seek inner serenity and tranquility. However, unfortunately, some people choose to do self-healing in the wrong and deviant way. Therefore, this research aims to straighten up and reveal the self-healing concept in the Quran by analyzing the words Sakana and Ithma'anna and their derivation embodying the meaning of tranquility. This study is library research by implementing a semantic approach. The applied data collection method was documentation using primary and secondary data, i.e., the Quran, Al-Misbah, Al-Qurthubi, and Ibn Kathir exegesis. This research result indicates that Allah sends down tranquility for those with mental readiness and decorates themselves with commendable qualities. This research also conveys several deeds that can be done as self-healing, which in reality is contrary to the habits of today's younger generation. Eventually, the serenity that all man desires is eternal tranquility, which is included in the group of people who are called upon by Allah and addressed by 'O tranquil soul' when he dies and on the Day of Resurrection.

Development of thermoplastic self-healing panels by 3D printing technology and study extrinsic healing system under low-velocity impact analysis

This study introducing self-healing concept into thermoplastic panels for engineering applications. Hence, the base self-healing square shaped panels were manufactured using a common thermoplastic, polylactic acid (PLA), and glass/in-situ vascular channels as healing carriers via 3D printing additive process. 3D printing is the best approach for inserting glass vascular channels and creating insitu channels inside the panels. Two types of healing resins were prepared with polymethyl methacrylate (PMMA) and Acrylonitrile 1–3 Butadiene Styrene (ABS) solutions to adjust the chemistry of PLA and healing channels for effective healing without any trouble. A drop weight impact test with the low-velocity mode is conducted on prepared PLA panels. To study the self-healing behaviour of panels 23.05 N-m impact energy was applied to create the initial damage of the PLA panels. The impacted specimens were examined through ultrasonic C-scan for observing the healing process at damaged portion. The experimental results show the effective healing behavior of PLA panels were (after self-healing) about 75% and 80% of PLA-PMMA and PLA-ABS, respectively. This study also deals on the damage model-based numerical study was established on PLA panels using the Ansys workbench to investigate the failure mechanisms of PLA self-healing panels.

Preliminary study on a new self-sealing strategy for nuclear reactor containment buildings using phase change materials

Nuclear containment buildings are designed as the final barriers to prevent the release of radioactive materials. A containment building consists of a containment liner plate (CLP) and a thick concrete wall. Concrete inevitably deteriorates due to a variety of factors, including the continuously applied load and plastic shrinkage. This continued deterioration could cause cracks in the concrete, which may extend through the entire concrete wall. This would ultimately compromise the ability of a containment building to serve as a final barrier between a nuclear power plant and its surroundings. As a passive measure to repair cracks, research on self-healing concrete has been conducted. In general, self-healing concrete is made by adding a healing agent or bacteria to a concrete mix. However, the previous self-healing concepts cannot be easily applied to current nuclear containment buildings since changes in the chemical composition of concrete mixes cause the changes in the mechanical properties of concrete; thus, a different containment design that matches the changed properties is required. Therefore, in this study, a new self-sealing strategy based on a phase change material (PCM) is introduced, in which the PCM seals a crack physically rather than chemically. To investigate the feasibility of this new strategy, numerical simulations with a thermal analysis were conducted. In addition, experiments were carried out to validate the results of the numerical simulations. The numerical simulations show that the PCMs can seal cracks with maximum sizes of 1.3 mm and 1.8 mm when the inlet temperatures are 60 °C and 55 °C, respectively. Finally, based on the results of successful PCM sealing, even with several conservative assumptions that make it difficult for the PCM to seal a crack, it is concluded that the new self-sealing strategy is indeed feasible.

Self-Healing of Active Distribution Networks by Accurate Fault Detection, Classification, and Location

The power system self-healing concept needs accurate and reliable fault detection, classification, and location (FDCL). This research proposes a novel and robust FDCL approach for distribution networks (DNs) in proportion to self-healing requirements. The proposed algorithm utilized a discrete wavelet transform (DWT) to decompose the measured current and zero sequence current component of only one terminal (substation) to detect and classify all fault types with the identification of the faulted phase (s). The fault location is achieved by integrating DWT and support vector machine (SVM). The data for training were extracted using DWT and collected, and then SVM was trained to locate the faulted section. The simplicity of the applied approach, ignoring DG’s data that is merged into the system, reduced training data and time, ability to diagnose all fault types, and high accuracy are the most significant contributions. The proposed techniques are tested on IEEE 33 bus DN with two distributed generation (DG) units, which are simulated in MATLAB. The simulation results demonstrate that the proposed methods give more accurate and reliable results for diagnosing the faults (FDCL) of various fault sorts, DN size, and resistance levels.

Self-Healing concept for musculoskeletal pain management: An evidence-based review

Le linee guida internazionali includono generalmente approcci complementari e integrativi nella gestione del dolore muscoloscheletrico. Ciò consente di migliorare il benessere globale, riducendo al contempo il ricorso alle terapie farmacologiche tradizionali e il rischio di effetti indesiderati ad esse associato.

Self-Healing concept for musculoskeletal pain management: An evidence-based review

Les directives internationales englobent couramment des approches complémentaires et intégratives dans la prise en charge de la douleur musculosquelettique ; l’objectif étant d’améliorer le bien-être général tout en réduisant simultanément le recours aux traitements pharmacologiques conventionnels et le risque d’effets secondaires qui leur est associé.

Self-Healing concept for musculoskeletal pain management: An evidence-based review

International guidelines are commonly integrating complementary and integrative approaches into the management of musculoskeletal pain. This improves overall well-being while concomitantly reducing the reliance on conventional pharmacological treatments and the associated risk of side effects.

Self-Healing concept for musculoskeletal pain management: An evidence-based review

Mezinárodní směrnice běžně zapojují doplňkové a integrativní přístupy do léčby muskuloskeletální bolesti, což zlepšuje celkovou kvalitu života a současně snižuje závislost na konvenční farmakologické léčbě a s tím související riziko nežádoucích účinků.