scholarly journals Recent progress on the research of high strength hydrogels

2015 ◽  
Author(s):  
Da Zhang ◽  
Liang Chen ◽  
Zaiqin Wang ◽  
Tao Wei
Keyword(s):  
Recent Progress ◽  
High Strength

scholarly journals Recent Progress in 3D Printing of Elastic and High-Strength Hydrogels for the Treatment of Osteochondral and Cartilage Diseases

2020 ◽  
Vol 8 ◽  
Author(s):  
Wenli Dai ◽  
Muyang Sun ◽  
Xi Leng ◽  
Xiaoqing Hu ◽  
Yingfang Ao
Keyword(s):  
Articular Cartilage ◽  
3D Printing ◽  
Recent Progress ◽  
High Strength ◽  
Cartilage Defects ◽  
High Water Content ◽  
Covalent Bonds ◽  
Cartilage Diseases ◽  
Articular Cartilage Defects ◽  
And Cartilage

Despite considerable progress for the regenerative medicine, repair of full-thickness articular cartilage defects and osteochondral interface remains challenging. This low efficiency is largely due to the difficulties in recapitulating the stratified zonal architecture of articular cartilage and engineering complex gradients for bone-soft tissue interface. This has led to increased interest in three-dimensional (3D) printing technologies in the field of musculoskeletal tissue engineering. Printable and biocompatible hydrogels are attractive materials for 3D printing applications because they not only own high tunability and complexity, but also offer favorable biomimetic environments for live cells, such as porous structure, high water content, and bioactive molecule incorporation. However, conventional hydrogels are usually mechanically weak and brittle, which cannot reach the mechanical requirements for repair of articular cartilage defects and osteochondral interface. Therefore, the development of elastic and high-strength hydrogels for 3D printing in the repairment of cartilage defects and osteochondral interface is crucial. In this review, we summarized the recent progress in elastic and high-strength hydrogels for 3D printing and categorized them into six groups, namely ion bonds interactions, nanocomposites integrated in hydrogels, supramolecular guest–host interactions, hydrogen bonds interactions, dynamic covalent bonds interactions, and hydrophobic interactions. These 3D printed elastic and high-strength hydrogels may provide new insights for the treatment of osteochondral and cartilage diseases.

Concrete in Canada: 50 years of progress — present concerns

2018 ◽  
Vol 45 (2) ◽  
pp. 117-124
Author(s):  
Pierre-Claude Aïtcin ◽  
William Wilson ◽  
Sidney Mindess
Keyword(s):  
Silica Fume ◽  
Material Properties ◽  
Recent Progress ◽  
High Strength ◽  
Blended Cements ◽  
The Past ◽  
Concrete Admixtures

Over the past 50 years, concrete in Canada has evolved from a simple robust material to a complex composite with impressive improvements in the material properties. Due to the development of water reducers and silica fume, the performance of concrete has improved from the conventional 30 MPa concrete before the CN Tower (1973) to the ultra-high strength 200 MPa concrete used in the Passerelle de Sherbrooke (1998). This paper retraces this evolution of concrete with a focus on both the technical improvements and the important structures built with these technologies. Recent progress in blended cements and poly-carboxylate ether superplasticizers is also presented, along with the concerns and current challenges to ensure an optimized and safe use of these new concrete admixtures.

scholarly journals Current Challenges and Opportunities in Microstructure-Related Properties of Advanced High-Strength Steels

2020 ◽  
Vol 51 (11) ◽  
pp. 5517-5586 ◽  
Author(s):  
Dierk Raabe ◽  
Binhan Sun ◽  
Alisson Kwiatkowski Da Silva ◽  
Baptiste Gault ◽  
Hung-Wei Yen ◽  
...  
Keyword(s):  
Recent Progress ◽  
High Strength Steels ◽  
High Strength ◽  
Advanced Characterization ◽  
Critical Discussion ◽  
Press Hardening ◽  
Advanced High Strength Steels ◽  
Bainitic Steels ◽  
Challenges And Opportunities ◽  
Recent Developments

Abstract This is a viewpoint paper on recent progress in the understanding of the microstructure–property relations of advanced high-strength steels (AHSS). These alloys constitute a class of high-strength, formable steels that are designed mainly as sheet products for the transportation sector. AHSS have often very complex and hierarchical microstructures consisting of ferrite, austenite, bainite, or martensite matrix or of duplex or even multiphase mixtures of these constituents, sometimes enriched with precipitates. This complexity makes it challenging to establish reliable and mechanism-based microstructure–property relationships. A number of excellent studies already exist about the different types of AHSS (such as dual-phase steels, complex phase steels, transformation-induced plasticity steels, twinning-induced plasticity steels, bainitic steels, quenching and partitioning steels, press hardening steels, etc.) and several overviews appeared in which their engineering features related to mechanical properties and forming were discussed. This article reviews recent progress in the understanding of microstructures and alloy design in this field, placing particular attention on the deformation and strain hardening mechanisms of Mn-containing steels that utilize complex dislocation substructures, nanoscale precipitation patterns, deformation-driven transformation, and twinning effects. Recent developments on microalloyed nanoprecipitation hardened and press hardening steels are also reviewed. Besides providing a critical discussion of their microstructures and properties, vital features such as their resistance to hydrogen embrittlement and damage formation are also evaluated. We also present latest progress in advanced characterization and modeling techniques applied to AHSS. Finally, emerging topics such as machine learning, through-process simulation, and additive manufacturing of AHSS are discussed. The aim of this viewpoint is to identify similarities in the deformation and damage mechanisms among these various types of advanced steels and to use these observations for their further development and maturation.

Advances in Bonding Technology for Electronic Packaging

1993 ◽  
Vol 115 (2) ◽  
pp. 201-207 ◽  
Author(s):  
Chin C. Lee ◽  
Chen Y. Wang ◽  
Goran Matijasevic
Keyword(s):  
Cross Section ◽  
Recent Progress ◽  
High Strength ◽  
Acoustic Microscopy ◽  
Bonding Layer ◽  
Alloy Formation ◽  
Advantages And Disadvantages ◽  
Bonding Technology ◽  
Higher Temperature ◽  
Good Uniformity

Recent progress in bonding materials is briefly reviewed with highlights of some of the advantages and disadvantages of the various attachment processes. The principle and experimental results of bonding with multilayer structures of Au-Sn and Au-In are presented. Using solid state as well as liquid phase diffusion of the multilayers, bonding temperatures less than the final melting point of the alloy can be used. This technique therefore allows reversal of the conventional soldering step hierarchy allowing a higher temperature process to follow the multilayer bonding step. Proper deposition of the multilayers inhibits oxidation of tin or indium. Die attachment experiments confirmed that high quality bonding can be obtained as seen in the void-free bonding layer images done by scanning acoustic microscopy. Cross-section examinations with SEM and EDX show near-eutectic alloy formation of good uniformity. Thermal shock tests confirmed the high strength of these solder alloys.

High-strength hydrogel-based bioinks

2019 ◽  
Vol 3 (9) ◽  
pp. 1736-1746 ◽  
Author(s):  
Fei Gao ◽  
Changshun Ruan ◽  
Wenguang Liu
Keyword(s):  
Recent Progress ◽  
High Strength ◽  
Hydrogel Scaffolds ◽  
3D Printed

This review summarizes high-strength hydrogel-based bioinks, including general requirements for designing suitable high-strength hydrogel bioinks, and recent progress of 3D printed high-strength hydrogel scaffolds.

Mussel-Inspired Underwater Adhesives- from Adhesion Mechanisms to Engineering Applications: A Critical Review

2021 ◽  
Vol 9 (2) ◽  
pp. 167-188
Author(s):  
Yanfei Ma ◽  
Bozhen Zhang ◽  
Imri Frenkel ◽  
Zhizhi Zhang ◽  
Xiaowei Pei ◽  
...  
Keyword(s):  
Recent Progress ◽  
Interaction Mechanism ◽  
High Strength ◽  
Research Progress ◽  
Engineering Applications ◽  
Adhesion Mechanism ◽  
The Future ◽  
Potential Applications ◽  
Mussel Adhesive ◽  
Adhesive Materials

Recent progress in the adhesion mechanism of mussels has led to great excitement in the field of adhesive materials. Although great progress has been made in the mussel adhesion mechanism and underwater adhesives, there are still many unknowns and challenges in this area. Thus, it is highly important to review the recent progress in mechanisms of mussel adhesion and mussel-inspired adhesives and predict trends for the future. In this review, we (1) summarize the research progress in fundamental interaction mechanisms in natural mussels; (2) discuss the application of the mussel interaction mechanism in the biomimetic mussel adhesive materials, from permanent/high-strength adhesives to temporary/smart adhesives; (3) briefly state the potential applications of the mussel-inspired adhesives in multiple fields, such as engineering applications, smart robotics and biomedicine; (4) summarize the future perspectives and unsolved challenges of mussel adhesion mechanisms and mussel-inspired adhesive materials. We envision that this review will provide an insightful perspective in understanding the mussel adhesion mechanism and directions to further explore, and promote the development of novel biomimetic mussel adhesive materials.

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