Stimulus Responsive Electrospun Nanofibers

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Stimuli Responsive Electrospun Fibers

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Author : Erin Sue Hendrick
language : en
Publisher:
Release Date : 2011

Stimuli Responsive Electrospun Fibers written by Erin Sue Hendrick and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.

Stimuli-responsive fibers were created by incorporating pH-sensitive nanoparticles into electrospun cellulose acetate (CA) and poly(lactic acid) (PLA) fibers. The fluorescent silica nanoparticles, Cornell dots (C dots), have both a fluorescent core (518 nm emission), and a fluorescent pH-sensitive shell (572 nm emission). Using confocal microscopy, the signaling effectiveness of these fibers was studied by varying several parameters: fiber diameter, substrate, and surface hydrophilicity. For the CA fibers, fiber diameter was varied by changing the feed rate during the electrospinning process to 0.03 mL/hr, 0.30 mL/hr and 0.30 mL/min, producing fibers with average diameters of 1.1 [MICRO SIGN]m, 1.8 [MICRO SIGN]m and 9.5 [MICRO SIGN]m, respectively. It was found that fibers with larger surface area had a greater sensitivity to pH change than fibers with smaller surface area. The response of the pH-sensitive fibers also varied when both the nanoparticles and CA fibers were applied/electrospun onto the surface of four different substrates: optical glass slides, cotton, cotton/polyester, and nylon/spandex fabrics. Fibers spun onto glass slides and cotton/polyester showed an improvement in sensitivity to pH change, while the cotton and nylon/spandex samples were greatly influenced by the chemistry inherent to these substrates. Poly(lactic acid) - b - poly(ethylene glycol) (PLA-b-PEG) copolymers with block lengths of 1000-750, 5000-1000 and 1000-5000 and bulk PEG were added to PLA electrospinning dopes to create hydrophilic but non-water soluble nanofibers. PLA-b-PEG block lengths strongly affected the total amount of PEG that could be incorporated, spinnability and fiber morphology. Solutions containing>1% w/w of the lowest molecular weight copolymer PLA (1000) - b - PEG (750) formed an unspinnable, cloudy gel. Addition of the PLA (5000) - b - PEG (1000) to the base spinning solution influenced fiber diameters and spinnability in the same manner as simply increasing PLA concentration in the spinning dope. Addition of PLA (1000) - b - PEG (5000) resulted in decreased fiber diameters, and allowed for the highest overall copolymer loading. In final fiber formulations, maximums of 0.9, 2.9 and 9.3 wt% PEG could be added to the fibers using the PLA-b-PEG 1000-750, 5000-1000 and 1000-5000 respectively. PEG (MW = 3350 g/mol) homopolymer was added to the spinning dopes to result in 1.0 and 5.0 wt% PEG in the final fibers. These spinning dopes were electrospun with more non-uniform and variable morphology and diameter size than occurred with the addition of PEG in block copolymer form. Water absorbance by electrospun nonwoven fabrics increased by four times over the control PLA with the addition of 1.0 wt% PEG, and by eighteen times with the addition of 9.3 wt% PEG with the block copolymers. At similar overall PEG loadings, the addition of PLA-b-PEG resulted in a two to four fold increase in water wicking over the addition of PEG homopolymer. The improvement in water wicking was mirrored in the pH-measurement data compiled for these samples on glass slides. It was found that response to pH change was influenced by PEG content, copolymer chain length, fiber geometry and water wicking. Finally, incorporating CA and PLA/PLA-b-PEG fibers into a prototype fluidic chip created a pH-sensing device. The response of the fibers was consistent with the increases in surface area and wicking rate, just as in the glass slides experiments, and proved to be a functional method for measuring pH change.

Electrospun Polymeric Nanofibers

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Author : R. Jayakumar
language : en
Publisher: Springer Nature
Release Date : 2023-04-27

Electrospun Polymeric Nanofibers written by R. Jayakumar and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-04-27 with Technology & Engineering categories.

This volume deals with the various fabrication techniques, surface functionalization and biomedical applications of polymeric fibers possessing different scale and structure. It provides an overview of fabrication techniques such as Co-axial, Centrifugal, Melt and Yarning to procure multiscale, tubular and layered fibrous scaffold employed for biomedical applications. The chapters in this volume discusse the surface/chemical functionalization of fibers which enhance the biological properties of the fibrous scaffolds as well as the development of hybrid, layered and external stimuli-responsive fibrous scaffolds that hold potential application in biosensor and other biomedical fields. In addition, recent advances and applications of polymeric multiscale fibers in tissue engineering, regenerative medicine and drug delivery are presented. The potential use of fibrous scaffolds in bone, neural, tendon/ligament and cardiac tissue engineering, nanofibers as an antimicrobial wound dressing, employed in cancer theragnostics and in the treatment of skin/periodontal infections are discussed. The volume provides expert knowledge on the fabrication techniques, development of different scale and hybrid structure fibers, surface functionalization, layered and external stimuli responsive fibrous scaffolds. It will be beneficial to material/biomaterials scientists, bioengineering and biotechnologists by providing a better understanding on the subject of the innovative applications of fibrous scaffolds in drug delivery, tissue engineering, wound dressings and regenerative medicine.

Smart Stimuli Responsive Biomaterials For Programmed Drug Delivery

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Author : Seyed Morteza Naghib
language : en
Publisher: Frontiers Media SA
Release Date : 2023-06-08

Smart Stimuli Responsive Biomaterials For Programmed Drug Delivery written by Seyed Morteza Naghib and has been published by Frontiers Media SA this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-06-08 with Science categories.

Stimuli Responsive Dewetting Wetting Smart Surfaces And Interfaces

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Author : Atsushi Hozumi
language : en
Publisher: Springer
Release Date : 2018-11-16

Stimuli Responsive Dewetting Wetting Smart Surfaces And Interfaces written by Atsushi Hozumi and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-11-16 with Technology & Engineering categories.

Superhydrophobic surfaces, artificially mimicking lotus leaves, have captured the attention of scientists and engineers over the past few decades. Recent trends have shifted from superhydrophobicity to superominipohobicity, or superamphiphobicity. In addition, dynamic rather than static surface wetting/dewetting properties, which can be triggered by various stimuli, including temperature, pH, magnetic/electric fields, solvents, light exposure etc, have been highly sought after for commercial applications. This book will focus on recent topics related to various stimuli-responsive wetting/dewetting surfaces, and give an overview of the knowledge and concepts of how to design and establish these smart artificial surfaces, which can be used for technical developments in a wide variety research fields.

Engineered Polymeric Fibrous Materials

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Author : Masoud Latifi
language : en
Publisher: Woodhead Publishing
Release Date : 2021-06-04

Engineered Polymeric Fibrous Materials written by Masoud Latifi and has been published by Woodhead Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-06-04 with Technology & Engineering categories.

Engineered Polymeric Fibrous Materials explains cutting edge techniques for the engineering of fibrous materials from physical, mechanical, and chemical points of view. Both conventional and nanofibers are described in this uniquely comprehensive book, for a wide range of applications including biomedical, automotive, aerospace, agriculture, energy, and environmental. This book refers to recent advances made in both academia and industry, in topics such as fiber-reinforced composites, fibrous thermal insulators, drug delivery and tissue engineering, and smart textiles and energy, and explains how fibrous structures are engineered to offer new solutions to important problems. The first two chapters provide basic introductory information to allow a wider range of readers to engage with the book. Addresses hot emerging topics including smart materials, wearable energy harvesters, and solar fuel production Includes valuable technical advice that is useful to industries including aerospace, biomedical, and energy Covers the full lifecycle of the material, from processing and treatment through to end usage

Fiber And Textile Engineering In Drug Delivery Systems

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Author : Navneet Sharma
language : en
Publisher: Elsevier
Release Date : 2022-12-05

Fiber And Textile Engineering In Drug Delivery Systems written by Navneet Sharma and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-12-05 with Technology & Engineering categories.

Fiber and Textile Engineering in Drug Delivery Systems explains how innovative textile processing methods including rotary spinning, microfluidics, wet spinning and electrospinning can be used to produce novel drug delivery solutions. This topical book provides detailed descriptions of how to produce such new materials for this purpose, with foundational content to help readers from a range of backgrounds understand the context of material selection and design decisions. Emphasis is given to the engineering side of the manufacturing of the textile and its role in drug delivery, but this also acts as a guide to pharmaceutical applications of textile fibers for materials scientists. Drug delivery research is rapidly expanding and experimenting with new materials to drive improved clinical outcomes as the efficacy of the therapeutic molecule is highly dependent on the right choice of carrier system. Recently, fiber based carriers at both nano and micro scales are gaining interest in the scientific community due to ease of manufacturing, high surface area to volume ratio, desirable drug release kinetics and high mechanical strength. Describes methods for material selection and design for drug delivery systems Provides case studies to explain how these techniques can be applied successfully Covers the regulatory and legal aspects of the use of the textiles and fibers in drug delivery

Electrospun Nanofibers

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Author : Ashok Vaseashta
language : en
Publisher: Springer Nature
Release Date : 2022-07-14

Electrospun Nanofibers written by Ashok Vaseashta and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-07-14 with Technology & Engineering categories.

This book presents the development of electrospun materials, fundamental principles of electrospinning process, controlling parameters, electrospinning strategies, and electrospun nanofibrous structures with specific properties for applications in tissue engineering and regenerative medicine, textile, water treatment, sensor, and energy fields. This book can broadly be divided into three parts: the first comprises basic principles of electrospinning process, general requirements of electrospun materials and advancement in electrospinning technology, the second part describes the applications of electrospun materials in different fields and future prospects, while the third part describes applications that can be used in advanced manufacturing based on conjoining electrospinning and 3D printing. Electrospinning is the most successful process for producing functional nanofibers and nanofibrous membranes with superior chemical and physical properties. The unique properties of electrospun materials including high surface to volume ratio, flexibility, high mechanical strength, high porosity, and adjustable nanofiber and pore size distribution make them potential candidates in a wide range of applications in biomedical and engineering areas. Electrospinning is becoming more efficient and more specialized in order to produce particular fiber types with tunable diameter and morphology, tunable characteristics, having specific patterns and 3D structures. With a strong focus on fundamental materials science and engineering, this book provides systematic and comprehensive coverage of the recent developments and novel perspectives of electrospun materials. This comprehensive book includes chapters that discuss the latest and emerging applications of nanofiber technology in various fields, specifically in areas such as wearable textile, biomedical applications, energy generation and storage, water treatment and environmental remediation, and sensors such as biomarkers in healthcare and biomedical engineering. Despite all these advancements, there are still challenges to be addressed and overcome for nanofiber technology to move towards maturation.

Electrospinning

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Author : Liming Wang
language : en
Publisher: John Wiley & Sons
Release Date : 2024-02-05

Electrospinning written by Liming Wang and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024-02-05 with Technology & Engineering categories.

Electrospinning Unique resource highlighting new methods and emerging applications of electrospinning, such as manufacturing of nanofiber yarn, solar steam generation, thermoelectric generators, water-induced electric generators, actuators, and biomedical applications. Electrospinning introduces the basic principles and state-of-the-art methods of electrospinning in depth and continues on to highlight the most relevant and recent applications associated with the remarkable features of nanofibers. Written by two highly qualified authors with significant experience in the field, Electrospinning includes information on: History and development of the electrospinning theories and the state-of-the-art methods for fiber structure regulation, mass production of electrospun fibers, and manufacturing of electrospun fiber yarns Electrospinning nanofiber-based evaporators for interfacial solar-driven steam generation and preparation and application of electrospun nanofibers in heat insulation Research progress on sound absorption of electrospun fibrous materials and electrospun nanofiber-based triboelectric nanogenerator Preparation and application of thermoelectric materials and devices based on electrospun fibers and electrospun nanofiber-based water-induced electric-generation Providing a comprehensive overview of electrospinning, including the principle, methods, and latest applications, Electrospinning is an essential resource for materials scientists, polymer chemists, chemists in industry, electrochemists, catalytic chemists, and electronics engineers.

Smart Internal Stimulus Responsive Nanocarriers For Drug And Gene Delivery

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Author : Mahdi Karimi
language : en
Publisher: Morgan & Claypool Publishers
Release Date : 2015-12-01

Smart Internal Stimulus Responsive Nanocarriers For Drug And Gene Delivery written by Mahdi Karimi and has been published by Morgan & Claypool Publishers this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-12-01 with Science categories.

The concept of smart drug delivery vehicles involves designing and preparing a nanostructure (or microstructure) that can be loaded with a cargo. This can be a therapeutic drug, a contrast agent for imaging, or a nucleic acid for gene therapy. The nanocarrier serves to protect the cargo from degradation by enzymes in the body, to enhance the solubility of insoluble drugs, to extend the circulation half-life, and to enhance its penetration and accumulation at the target site. Importantly, smart nanocarriers can be designed to be responsive to a specific stimulus, so that the cargo is only released or activated when desired. In this volume we cover smart nanocarriers that respond to internal stimuli that are intrinsic to the target site. These stimuli are specific to the cell type, tissue or organ type, or to the disease state (cancer, infection, inflammation etc). pH-responsive nanostructures can be used for cargo release in acidic endosomal compartments, in the lower pH of tumors, and for specific oral delivery either to the stomach or intestine. Nanocarriers can be designed to be substrates of a wide-range of enzymes that are over-expressed at disease sites. Oxidation and reduction reactions can be taken advantage of in smart nanocarriers by judicious molecular design. Likewise, nanocarriers can be designed to respond to a range of specific biomolecules that may occur at the target site. In this volume we also cover dual and multi-responsive systems that combine stimuli that could be either internal or external.

Stimuli Responsive Gels

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Author : Dirk Kuckling
language : en
Publisher: MDPI
Release Date : 2018-10-11

Stimuli Responsive Gels written by Dirk Kuckling and has been published by MDPI this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-10-11 with Electronic books categories.

This book is a printed edition of the Special Issue "Stimuli-Responsive Gels" that was published in Gels