Synthesis and characterization of functional paper actuators that react to external magnetic fields

Synthesis and characterization of functional paper actuators that react to external magnetic fields PDF

Author: Huaying Wang

Publisher: Cuvillier Verlag

Published: 2016-07-06

Total Pages: 172

ISBN-13: 3736982933

DOWNLOAD EBOOK →

This book describes a novel strategy to design magnetic paper materials and gain a deeper understanding for the bending behavior of paper-based magnetic actuators upon the application of an external magnetic field. Magnetic paper sheets have been prepared by using different strategies, including the physical entrapment of magnetic beads within surface-attached polymer networks and the covalent attachment of polymer-modified magnetic particles to cellulose fibers. After preparation, the magnetic paper sheets have been characterized with respect to the loading degree, wetting properties, morphology and magnetism by using different methods. Furthermore, paper-based actuators have been fabricated and the bending behavior of such actuators within an external magnetic field has been studied in detail. Thereby, a simple model has been developed to understand the bending behavior of magnetic paper in more depth. In addition, first concepts for the use of magnetic paper sheets in high-tech applications, including magnetic fluid shutters, that allow the fluid transport between adjacent paper sheets, are described.

Fabrication and Characterization of Magneto-Responsive Actuators

Fabrication and Characterization of Magneto-Responsive Actuators PDF

Author: Ann Reyes Kadozono

Publisher:

Published: 2021

Total Pages:

ISBN-13:

DOWNLOAD EBOOK →

This paper presents the fabrication and characterization of a magneto-responsive actuator synthesized using PDMS as the non-magnetic polymeric matrix and iron oxide microparticles as the magnetic particle, to create a flexible composite. When the composite is exposed to an external magnetic field, it deforms and changes shape. This type of material is known as a magnetorheological elastomer, or MRE, and is an emerging smart material. Magnetorheological elastomers can change their mechanical and rheological properties when an external magnetic field is present. MREs traditionally have between 20 to 30 percent by weight (% wt.) of their particles in the non-magnetic polymeric matrix. In this research, the elastomers were developed with smaller weight percentages range from 1 to 5 % wt., . Despite their lower weight percentage, the fabricated elastomers exhibited similar actuation to an elastomer with 30 % wt. The intensity of actuation depends on many factors including concentration, type and distribution of magnetic particles, additives, type and concentration of matrix material, and magnetic field strength. In this paper, the factors investigated and studied are the concentration and distribution of magnetic particles, additives, and magnetic field strength. To test the concentration and distribution of magnetic particles, four sets of composites were developed, each having different weight percentages of iron oxide microparticles. From this, another set of composites were developed with the same weight percentages, but an additive was included to improves the dispersion of particles in the composite. Oleic acid was used as the additive to coat the particles with a non-polar layer to slow down the agglomeration of particles. After developing all the composites, experiments were designed to observe the change in actuation, by bending, which occurs when varying strengths of the magnetic field were applied. In conclusion, the addition of the oleic acid at a higher magnetic field strength caused the largest change in actuation. The 5 wt.% MRE with oleic acid demonstrated similar actuation to the MRE with 30 wt.%.

Handbook of Solid State Chemistry, 6 Volume Set

Handbook of Solid State Chemistry, 6 Volume Set PDF

Author: Richard Dronskowski

Publisher: John Wiley & Sons

Published: 2017-10-23

Total Pages: 3912

ISBN-13: 3527325875

DOWNLOAD EBOOK →

This most comprehensive and unrivaled compendium in the field provides an up-to-date account of the chemistry of solids, nanoparticles and hybrid materials. Following a valuable introductory chapter reviewing important synthesis techniques, the handbook presents a series of contributions by about 150 international leading experts -- the "Who's Who" of solid state science. Clearly structured, in six volumes it collates the knowledge available on solid state chemistry, starting from the synthesis, and modern methods of structure determination. Understanding and measuring the physical properties of bulk solids and the theoretical basis of modern computational treatments of solids are given ample space, as are such modern trends as nanoparticles, surface properties and heterogeneous catalysis. Emphasis is placed throughout not only on the design and structure of solids but also on practical applications of these novel materials in real chemical situations.

Cardiac Tissue Engineering

Cardiac Tissue Engineering PDF

Author: Smadar Cohen

Publisher: Morgan & Claypool Publishers

Published: 2012-10-01

Total Pages: 202

ISBN-13: 1608452050

DOWNLOAD EBOOK →

Cardiac tissue engineering aims at repairing damaged heart muscle and producing human cardiac tissues for application in drug toxicity studies. This book offers a comprehensive overview of the cardiac tissue engineering strategies, including presenting and discussing the various concepts in use, research directions and applications. Essential basic information on the major components in cardiac tissue engineering, namely cell sources and biomaterials, is firstly presented to the readers, followed by a detailed description of their implementation in different strategies, broadly divided to cellular and acellular ones. In cellular approaches, the biomaterials are used to increase cell retention after implantation or as scaffolds when bioengineering the cardiac patch, in vitro. In acellular approaches, the biomaterials are used as ECM replacement for damaged cardiac ECM after MI, or, in combination with growth factors, the biomaterials assume an additional function as a depot for prolonged factor activity for the effective recruitment of repairing cells. The book also presents technological innovations aimed to improve the quality of the cardiac patches, such as bioreactor applications, stimulation patterns and prevascularization. This book could be of interest not only from an educational perspective (i.e. for graduate students), but also for researchers and medical professionals, to offer them fresh views on novel and powerful treatment strategies. We hope that the reader will find a broad spectrum of ideas and possibilities described in this book both interesting and convincing. Table of Contents: Introduction / The Heart: Structure, Cardiovascular Diseases, and Regeneration / Cell Sources for Cardiac Tissue Engineering / Biomaterials: Polymers, Scaffolds, and Basic Design Criteria / Biomaterials as Vehicles for Stem Cell Delivery and Retention in the Infarct / Bioengineering of Cardiac Patches, In Vitro / Perfusion Bioreactors and Stimulation Patterns in Cardiac Tissue Engineering / Vascularization of Cardiac Patches / Acellular Biomaterials for Cardiac Repair / Biomaterial-based Controlled Delivery of Bioactive Molecules for Myocardial Regeneration

Lanterna Rally - Theme by Grace Themes