Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 19 of 19 for “"healing efficiency"”.
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Crack Self-Healing in Alkali-Activated Materials: From Mechanisms to Strategies for Enhancing the Healing Efficiency
… has promoted the development of crack self-healing technologies. While crack self-healing in cement-based materials has been a topic of extensive research, very few studies have so far investigated the self-healing of AAMs. Therefore, there is need to explore self-healing approaches for …
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A Biomimic Self-healing Shape Memory Polymer Based Syntactic Foam for Smart Structural Composites
This study explored the development of a new self-healing Polystyrene Shape Memory Polymer (PSMP) based syntactic foam for service life extension in structural polymeric composites. The objective was to self-heal structural-length scale damage in an autonomous, efficient, timely and repeatable …
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Passive, Self-Healable, Dielectric Elastomers for Structural Health Monitoring
… investigation synthesizes an intrinsically self-healing poly(dimethylsiloxane) via a supra-molecular network of multi-strength hydrogen bonds. The modified poly(dimethylsiloxane) network must be effective in harsh environments, particularly extremely low temperatures, as well as retain the …
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Investigations of Press Bonded Zinc-Rich Powder Coatings
… as an additive imparted hydrophobicity and self-healing to both coatings. In addition, a 30% recovery of self-healing efficiency was provided by PDMS after the wiping test. The coating system exhibited superior corrosion resistance in a 3000-h neutral salt spray test. The formulation offers novel …
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Self-healing strain-hardening cementitious composites (SH2CC) for cyclic loading environments
… and repair costs due to cyclic loading, self-healing techniques could be applied in combination with fibre-reinforced strain-hardening cementitious composites (SHCC); the former enables cementitious materials to heal cracks without human intervention, and the latter features much higher …
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Development of multifunctional polymer composites with self-healing capability
Self-healing is an inherent property of living organisms, which poses a significant challenge for materials science. In recent years, self-repair mechanisms observed in plants have been recognized as promising models for the development of bio-inspired self-healing materials. The potential of …
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Solvent-based self-healing approaches for fiber-reinforced composites
… or costly to repair. The incorporation of self-healing functionality in composite materials has the potential to greatly extend material lifetime and reliability. Although there has been remarkable progress in self-healing polymers over the the past decade, self-repair in fiber-reinforced …
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Reactive MgO and Self-healing Microcapsules for Enhanced Well Cement Performance
… variable underground wellbore environment. Self-healing materials which have the capability for autonomous crack repair are an attractive solution for addressing cracking problems in oil well cement. Engineered additions of healing agents for autonomic self-healing via a delivery system have been …
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Healing of complex damage modes in model composites
Self-healing has potential to extend the usable lifetime of composite materials. Introducing self-healing systems to fiber reinforced composites has proven to be difficult due to the high temperatures and pressures of processing as well as the requirement that the delivery scheme for the healing …
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A self healing smart syntactic foam based grid stiffened sandwich structure
… genuine need to develop impact-tolerant and self-healing syntactic foams which can be used as a core in sandwich structures. In this study, a new shape memory polymer (SMP) based syntactic foam was proposed, fabricated, characterized, and tested using DSC, TEM, SEM, and stress-controlled …
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Enhancing Self-Healing Properties of Polymeric Nanocomposites through Surface Modification of Van der Waals 2D Materials: Exploring Beyond Graphene
… in polymer matrices to enhance their self-healing capabilities. The surface modification of these 2D materials with suitable functional chain ends is achieved and the resulting nanosheets possess the ability to chemically bond with the polymer matrix and actively participate in the healing …
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Synthesis and characterisation of biobased polyamides and their cellulose nanocomposites
… <br/><br/>A novel wholly biobased, self-healing, polyamide-based thermoplastic elastomer (PA36,36) was synthesised using a fatty dimer acid and a fatty dimer amine, both containing multiple alkyl chains, through a simple one-pot condensation polymerisation under different polymerisation …
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Understanding ureolytic calcium carbonate biomineralization for crack repair in cementitious materials
… outside of cracked buildings. Commercial self-healing concrete products are also available on the market. However, studies on the formation process and distribution of CaCO3 in cracks, and how it strengthens the cracked concrete on the micron scale are insufficient. On the performance level, …
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Microvascular strategies for damage restoration
… act as pathways for mass transport of liquid healing agents to damage regions that intersect the vasculature. Microvascular self-healing has proven effective in restoring fracture toughness and modulus by re-bonding the surfaces of damage-induced microcracks; however, large damage volumes …
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Novel encapsulation technologies for small size-scale self-healing applications
Self-healing technology offers an autonomic route to repairing damage in advanced polymers to extend their lifetime. A variety of self-healing systems have been developed for mechanical self-healing, protective coatings, and electronic self-healing. These self-healing systems rely on functional …
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Development of self-healing techniques for fiber reinforced composites
… repair defects deep inside the material. Self-healing polymers is an approach which has not yet been incorporated to commercial composites but promises to face some principal weak points. This smart technology aims to in-situ repair matrix cracks and matrix/reinforcement debonding and thus to …
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Fracture-induced mechanophore activation and solvent healing in poly(methyl methacrylate)
… The first demonstration of fully autonomous self-healing in PMMA is achieved through the use of solvent microcapsules. Solvent microcapsules with a PMMA-anisole liquid core are prepared and embedded within a linear PMMA matrix. Specimens of the microcapsule-loaded material are then fabricated for …
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Quantification of bond strength between cementitious materials and microbially-induced calcium carbonate precipitates
… mechanical strength of microbially-induced crack healing is seldom investigated, especially at the fundamental level. In an effort to aid future development of structural repairs using this technique, the research discussed herein examines the suitability of several test methods to quantify the …
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Stimuli-responsive microcapsules for self-protecting and self-healing material systems
… to develop self-protecting and self-healing material systems. Monodisperse, stimuli-responsive microcapsules are required for applications involving precise and controlled delivery of chemical payloads. However, such microcapsules are difficult to fabricate with high throughput and …