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"Wrapping"
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Non-covalent polymer wrapping of carbon nanotubes and the role of wrapped polymers as functional dispersants
Carbon nanotubes (CNTs) have been recognized as a promising material in a wide range of applications from biotechnology to energy-related devices. However, the poor solubility in aqueous and organic solvents hindered the applications of CNTs. As studies have progressed, the methodology for CNT dispersion was established. In this methodology, the key issue is to covalently or non-covalently functionalize the surfaces of the CNTs with a dispersant. Among the various types of dispersions, polymer wrapping through non-covalent interactions is attractive in terms of the stability and homogeneity of the functionalization. Recently, by taking advantage of their stability, the wrapped-polymers have been utilized to support and/or reinforce the unique functionality of the CNTs, leading to the development of high-performance devices. In this review, various polymer wrapping approaches, together with the applications of the polymer-wrapped CNTs, are summarized.
Journal Article
Bojagi : the art of Korean textiles
This is a creative guide to a unique and beautiful form of Korean art, steeped in ancient tradition. Bojagi are textiles that wrap, cover, carry, or store objects. Some are made from whole pieces of fabric and some are patched together from small scraps of cloth - they are a unique form of Korean textile art. The careful arrangement of shapes and colours shows an abstract composition which has made bojagi popular with textile artists and quilters today. In this book, experienced artist and educator Youngmin Lee gives you comprehensive step-by-step instructions on traditional bojagi techniques and materials, and provides a history of the art form in Korean culture - which dates back to the Joseon dynasty - where it continues to occupy a prominent place in the daily lives of Koreans.
BOOK
Effect of Fiber Wrapping on Bending Behavior of Reinforced Concrete Filled Pultruded GFRP Composite Hybrid Beams
The application of pultruded fiber reinforced polymer (FRP) composites in civil engineering is increasing as a high-performance structural element or reinforcing material for rehabilitation purposes. The advantageous aspects of the pultrusion production technique and the weaknesses arising from the 0° fiber orientation in the drawing direction should be considered. In this direction, it is thought that the structural performance of the profiles produced by the pultrusion technique can be increased with 90° windings by using different fiber types. This paper presents experimental studies on the effect of FRP composite wrapping on the flexure performance of reinforced concrete (RC) filled pultruded glass-FRP (GFRP) profile hybrid beams with damage analysis. The hybrid beams are wrapped fully and partially with Glass fiber reinforced polymer (GFRP) and carbon fiber reinforced polymer (CFRP) composites. Hybrid beam specimens with 0° to 90° fiber orientations were tested under three- and four-point bending loads. Based on the experimental load–displacement relationship results, initial stiffness, ductility, and energy dissipation capacity were compared. The experimental findings revealed that the maximum load-carrying capacities of beams produced with pultrude profiles increased by 24% with glass wrapping and 64.4% with carbon wrapping due to the change in the damages. A detailed damage analysis is provided. Similarly, significant increases were observed in structural performance ratios such as initial stiffness and ductility ratio.
Journal Article
Wrapping and unwrapping material culture : archaeological and anthropological perspectives
\"This innovative volume challenges contemporary views on material culture by exploring the relationship between wrapping materials and practices and the objects, bodies, and places that define them. Using examples as diverse as Egyptian mummies, Celtic tombs, Native American ceremonial bundles, baby swaddling, and contemporary African textiles, the dozen archaeologist and anthropologist contributors show how acts of wrapping and unwrapping are embedded in beliefs and thoughts of a particular time and place. These context specific, cultural, and technical acts offer a new lens on material culture and its relationship to cultural meaning\"-- Provided by publisher.
Book
Molybdenum Carbide Nanoparticles Coated into the Graphene Wrapping N‐Doped Porous Carbon Microspheres for Highly Efficient Electrocatalytic Hydrogen Evolution Both in Acidic and Alkaline Media
Molybdenum carbide (Mo2C) is recognized as an alternative electrocatalyst to noble metal for the hydrogen evolution reaction (HER). Herein, a facile, low cost, and scalable method is provided for the fabrication of Mo2C‐based eletrocatalyst (Mo2C/G‐NCS) by a spray‐drying, and followed by annealing. As‐prepared Mo2C/G‐NCS electrocatalyst displays that ultrafine Mo2C nanopartilces are uniformly embedded into graphene wrapping N‐doped porous carbon microspheres derived from chitosan. Such designed structure offer several favorable features for hydrogen evolution application: 1) the ultrasmall size of Mo2C affords a large exposed active sites; 2) graphene‐wrapping ensures great electrical conductivity; 3) porous structure increases the electrolyte–electrode contact points and lowers the charge transfer resistance; 4) N‐dopant interacts with H+ better than C atoms and favorably modifies the electronic structures of adjacent Mo and C atoms. As a result, the Mo2C/G‐NCS demonstrates superior HER activity with a very low overpotential of 70 or 66 mV to achieve current density of 10 mA cm−2, small Tafel slope of 39 or 37 mV dec−1, respectively, in acidic and alkaline media, and high stability, indicating that it is a great potential candidate as HER electrocatalyst. A simple, low cost, and scalable strategy for the fabrication of Mo2C‐based eletrocatalyst through spray‐drying and followed by annealing is demonstrated. As‐prepared Mo2C/G‐NCS catalyst exhibits excellent hydrogen evolution reaction performance both in acidic and alkaline media, which is attributed to synergistic effect from such an unique structure with graphene wrapping, ultrasmall Mo2C nanocrystallite, nitrogen‐dopant, and the well‐defined porous microspheres.
Journal Article
Cytoprotective metal-organic frameworks for anaerobic bacteria
We report a strategy to uniformly wrap Morella thermoacetica bacteria with a metal-organic framework (MOF) monolayer of nanometer thickness for cytoprotection in artificial photosynthesis. The catalytic activity of the MOF enclosure toward decomposition of reactive oxygen species (ROS) reduces the death of strictly anaerobic bacteria by fivefold in the presence of 21% O₂, and enables the cytoprotected bacteria to continuously produce acetate from CO₂ fixation under oxidative stress. The high definition of the MOF–bacteria interface involving direct bonding between phosphate units on the cell surface and zirconium clusters on MOF monolayer, provides for enhancement of life throughout reproduction. The dynamic nature of the MOF wrapping allows for cell elongation and separation, including spontaneous covering of the newly grown cell surface. The open-metal sites on the zirconium clusters lead to 600 times more efficient ROS decomposition compared with zirconia nanoparticles.
Journal Article
Experimental Study on Strengthening of Concrete Cylinders Using GFRP Sheets with Boron Carbide-Epoxy Composite
Usage of composite materials as a concrete strengthening agent had increased evidently in recent years. One of those materials is the Glass Fibre Reinforced Polymer (GFRP) which is used in various fields for strengthening and retrofitting of concrete structures. Various studies have shown that, the wrapping of concrete specimens with Glass Fibre Reinforced Polymer (GFRP) resulted in increase in the Compressive Strength as well as the ductility of the concrete members. The main Objective of this project is to enhance the axial compressive strength of concrete block wrapped by Glass Fibre Reinforced Polymer sheets tested with various compositions of Boron Carbide (B4C) mixed with epoxy resin to find out the increase in the compressive strength. Cylindrical Concrete specimen of standard size 150mm diameter and 300mm height were casted of M30 Grade Concrete. Totally 6 batches were casted which consists of 18 specimens composing of different compositions of Boron Carbide varying 1.5%, 3.0%, 4.5% and 6.0% of boron carbide (B4C) were added and mixed with epoxy resin. Finally, Glass fibre Reinforced Polymer is wrapped around the Concrete specimen with a single wrap and the results obtained from Compressive strength of the specimens were studied.
Journal Article
Impact Driven Liquid Encapsulation: Promises, Development, and Future Prospects
Encapsulation creates a protective outer layer(s) around a core cargo, which safeguards the cargo in aggressive surroundings. It also serves as a platform to impart various desired characteristics to the core cargo, including shell‐functionalization and targeted release characteristics. Encapsulation can be broadly classified into three categories: physical, chemical, and physicochemical techniques. This perspective focuses on an emerging class of impact‐driven physical encapsulation techniques, which offers several lucrative prospects compared to conventional encapsulation methods, including straightforward execution and ultrafast yet controlled wrapping. Two different categories of impact‐driven methods for achieving stable, ultrafast encapsulation of various core liquid analytes with one or more wrapping layers are discussed, namely, elastocapillary wrapping with ultrathin sheet(s) and a liquid–liquid encapsulation framework, where thin liquid film(s) are used to wrap liquid analytes, with an emphasis on the latter. The promising prospects of both approaches are discussed, recent developments are outlined, and areas of future research that can lead to a truly versatile and comprehensive encapsulation platform applicable to a broad range of practical applications are highlighted. This perspective explores impact‐driven encapsulation, focusing on liquid–liquid encapsulation for ultrafast, controlled wrapping of various liquid analytes. It discusses recent advancements, including scalable multidroplet/multilayer encapsulation, durable capsule formation, and active manipulation strategies. The study also outlines the associated challenges and discusses future directions for developing a versatile encapsulation platform with broad applications in targeted delivery, controlled release, and multifunctional material development.
Journal Article
Highly Sensitive Pseudocapacitive Iontronic Pressure Sensor with Broad Sensing Range
HighlightsThe iontronic pressure sensor achieved an ultrahigh sensitivity (Smin > 200 kPa−1, Smax > 45,000 kPa−1).The iontronic pressure sensor exhibited a broad sensing range of over 1.4 MPa.Pseudocapacitive iontronic pressure sensor using MXene was proposed.Flexible pressure sensors are unprecedentedly studied on monitoring human physical activities and robotics. Simultaneously, improving the response sensitivity and sensing range of flexible pressure sensors is a great challenge, which hinders the devices’ practical application. Targeting this obstacle, we developed a Ti3C2Tx-derived iontronic pressure sensor (TIPS) by taking the advantages of the high intercalation pseudocapacitance under high pressure and rationally designed structural configuration. TIPS achieved an ultrahigh sensitivity (Smin > 200 kPa−1, Smax > 45,000 kPa−1) in a broad sensing range of over 1.4 MPa and low limit of detection of 20 Pa as well as stable long-term working durability for 10,000 cycles. The practical application of TIPS in physical activity monitoring and flexible robot manifested its versatile potential. This study provides a demonstration for exploring pseudocapacitive materials for building flexible iontronic sensors with ultrahigh sensitivity and sensing range to advance the development of high-performance wearable electronics.
Journal Article