Stimuli Responsive Janus Particles
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Stimuli Responsive Janus Particles
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Author : Alina Kirillova
language : en
Publisher:
Release Date : 2016
Stimuli Responsive Janus Particles written by Alina Kirillova and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
Emulsion Stabilization With Janus Particles
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Author : Fuquan Tu
language : en
Publisher:
Release Date : 2015
Emulsion Stabilization With Janus Particles written by Fuquan Tu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
Emulsions are dispersions of droplets of one fluid within a second, immiscible fluid and have a wide range of applications from foodstuffs to pharmaceuticals to personal care products and agrochemicals. Emulsions are intrinsically unstable because of large interfacial area associated with the system. To obtain stable emulsions, the interfaces between immiscible fluids must be stabilized by emulsifying agents such as surfactants and colloidal particles. Surfactants refer to surface-active agents which prefer to segregate to interfaces between two immiscible fluids. Their surface activity originates from their amphiphilic structure. Colloidal particles can stabilize emulsions due to their tendency to attach strongly to the interface. It has been demonstrated that particles with amphiphilic structure (also known as Janus particles) can be synthesized. An important potential application of Janus particles comes from the fact that they could make unique solid surfactants, however, several questions needs to be answered: (1) It has been recognized for more than 100 years that surfactant molecules and homogeneous particles can attach to interfaces and stabilize emulsions. How would Janus particles be different from and, more importantly, advantageous over molecular surfactants and homogeneous particles in emulsion stabilization? (2) How does the structure or geometry of Janus particles influence their properties as solid surfactants? To answer these questions, thermodynamics of emulsion stabilization using amphiphilic Janus particles is investigated showing that they can indeed generate thermodynamically stable emulsion whereas emulsions stabilized by surfactant molecules and homogeneous particles are only kinetically stable. In addition, a new synthesis method is developed enabling the bulk synthesis of highly uniform pH-responsive Janus particles that are able to completely reverse their surfactant properties in response to changes in the solution pH. These Janus particles can stabilize different types of simple emulsions (oil-in-water and water-in-oil) at different pH and, more importantly, induce phase inversion of emulsions in response to changes in solution pH. Furthermore, one-step formation of stable multiple emulsions is demonstrated using these amphiphilic Janus. Multiple emulsions stabilized by these stimuli-responsive Janus particles can be induced to release the encapsulant by simply increasing the pH of the continuous phase. In conclusion, Janus particles represent promising systems as solid surfactants for making stable and smart emulsions.
Stimuli Responsive Materials
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Author : Marek W Urban
language : en
Publisher: Royal Society of Chemistry
Release Date : 2019-03-15
Stimuli Responsive Materials written by Marek W Urban and has been published by Royal Society of Chemistry this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-03-15 with Science categories.
The ability for a material to change properties in response to external stimuli is an attractive feature for numerous applications and as such stimuli responsive materials are gaining attention across many different fields. This book introduces the concepts of stimuli-responsiveness, including the fundamental materials properties required for design. It provides readers with comprehensive scientific principles and developments of stimuli responsive materials, as well as the recent technological advances. Written by a renowned expert in the field, this book is suitable for anyone interested in stimuli responsive materials working in polymers, biochemistry, biotechnology and materials science.
Janus Particle Synthesis Self Assembly And Applications
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Author : Shan Jiang
language : en
Publisher: Royal Society of Chemistry
Release Date : 2012-11-30
Janus Particle Synthesis Self Assembly And Applications written by Shan Jiang and has been published by Royal Society of Chemistry this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-11-30 with Science categories.
Named after the two-faced roman god, Janus particles have gained much attention due to their potential in a variety of applications, including drug delivery. This is the first book devoted to Janus particles and covers their methods of synthesis, how these particles self-assemble, and their possible uses. By following the line of synthesis, self-assembly and applications, the book not only covers the fundamental and applied aspects, but it goes beyond a simple summary and offers a logistic way of selecting the proper synthetic route for Janus particles for certain applications. Written by pioneering experts in the field, the book introduces the Janus concept to those new to the topic and highlights the most recent research progress on the topic for those active in the field and catalyze new ideas.
Stimuli Responsive Polymeric Membranes
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Author : Mihir Kumar Purkait
language : en
Publisher: Academic Press
Release Date : 2018-09-11
Stimuli Responsive Polymeric Membranes written by Mihir Kumar Purkait and has been published by Academic Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-09-11 with Science categories.
Stimuli Responsive Polymeric Membranes: Smart Polymeric Membranes explains the fundamentals and advances in topics relating to the field of membrane science. It elaborately explains concepts relating to stimuli responsive membranes, with special importance given down to minute details. Material selection, preparation, characterization and applications of various stimuli responsive membranes are extensively addressed, and their relevance (including examples) is included. The book covers history and development, merits and demerits, mechanisms of transport and fouling, applicability of membranes to various diverse areas, and preparation and characterization techniques of membranes. Next, the concept of fouling and its remedial actions is discussed. Finally, promising fields of research in the membrane science and future perspectives of membrane science field are explored. Provides basic and advanced knowledge of smart membranes, considering their morphological, physicochemical and separation characteristics Written in a clear and lucid style, keeping a diverse audience in mind Based on the state-of-art research of the authors
Flowing Matter
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Author : Federico Toschi
language : en
Publisher: Springer Nature
Release Date : 2019-09-25
Flowing Matter written by Federico Toschi and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-09-25 with Science categories.
This open access book, published in the Soft and Biological Matter series, presents an introduction to selected research topics in the broad field of flowing matter, including the dynamics of fluids with a complex internal structure -from nematic fluids to soft glasses- as well as active matter and turbulent phenomena. Flowing matter is a subject at the crossroads between physics, mathematics, chemistry, engineering, biology and earth sciences, and relies on a multidisciplinary approach to describe the emergence of the macroscopic behaviours in a system from the coordinated dynamics of its microscopic constituents. Depending on the microscopic interactions, an assembly of molecules or of mesoscopic particles can flow like a simple Newtonian fluid, deform elastically like a solid or behave in a complex manner. When the internal constituents are active, as for biological entities, one generally observes complex large-scale collective motions. Phenomenology is further complicated by the invariable tendency of fluids to display chaos at the large scales or when stirred strongly enough. This volume presents several research topics that address these phenomena encompassing the traditional micro-, meso-, and macro-scales descriptions, and contributes to our understanding of the fundamentals of flowing matter. This book is the legacy of the COST Action MP1305 “Flowing Matter”.
Controlling The Assembly Of Nanoparticles In Polymer Blends
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Author : Kyle C. Bryson
language : en
Publisher:
Release Date : 2016
Controlling The Assembly Of Nanoparticles In Polymer Blends written by Kyle C. Bryson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
While many novel methods have been devised for directing the assembly of nanoparticles in block copolymers, the topic has not reached the same level of sophistication for polymer blends. The assembly of particles at the interface between phase-separated domains can serve as a means to compatibilize polymer blends, reducing domain sizes and enhancing interdomain adhesion by impeding coalescence and decreasing interfacial tension. Compatibilization optimizes the performance of blended materials in applications where the properties of both components must be expressed synergistically, such as in plastics requiring both high strength and high toughness and in photovoltaic films. Thus, approaches to robustly control particle location in blends, especially those generating interfacial adsorption, are a much sought-after goal. This dissertation is a discussion of such approaches. Recognizing that Janus particles present a promising route to achieving interfacial adsorption of particles in an immiscible blend, we attempted the synthesis of several types of Janus particles with the goal of producing one that could kinetically stabilize a bicontinuous morphology in a blend during spinodal decomposition. Using ternary blends of polystyrene (PS), poly(methyl methacrylate) (PMMA), and Janus particles (JPs) with symmetric PS and PMMA hemispheres, we demonstrated the stabilization of dispersed and bicontinuous phase-separated morphologies by the interfacial adsorption of Janus particles during demixing upon solvent evaporation. The resulting blend morphology was varied by changing the blend composition and JP loading. Increasing particle loading decreased the size of phase-separated domains, while altering the mixing ratio of the PS/PMMA homopolymers produced morphologies ranging from PMMA droplets in a PS matrix to PS droplets in a PMMA matrix. Notably, bicontinuous morphologies were obtained at intermediate blend compositions, marking the first report of highly continuous domains obtained through demixing in a blend compatibilized by Janus particles. The JPs were found to assemble in a densely packed monolayer at the interface, thus largely preventing coalescence of domains in films annealed above the glass transition temperature. The rate of solvent evaporation from the drop-cast films and the molecular weights of the homopolymers were found to greatly affect blend morphology. In another approach, we used specific interactions to direct the localization of nanoparticles both within each phase and to the interface in a polymer blend. Using hydrogenbond- accepting nanoparticles, gold nanoparticles with poly(styrene-r-2-vinyl pyridine) (P(S-r- 2VP)) ligands, and two copolymers featuring competitive hydrogen-bond donation, poly(styrene-r-hydroxy styrene) (P(S-r-HS)) and poly(methyl methacrylate-r-2-hydroxyethyl methacrylate) (P(MMA-r-HEMA)), we demonstrated that the particles exhibit a distribution of locations strongly favoring the phase in which the total hydrogen-bonding interaction strength is greater. When HEMA/HS interactions were balanced, the particles displayed interfacial adsorption. This apparent balance occurs at a consistent ratio of HEMA/HS across several HEMA compositions. Annealing above the glass transition temperature generally induced adsorption at the interface between the two copolymers. Favorable hydrogen bonding interactions between phases increase the compatibility of the copolymers and can induce miscibility; the lower prevalence of hydrogen bonding at elevated temperatures is thus associated with increased interfacial tension, providing a greater driving force for the interfacial adsorption of 5 particles. This work marks one of the few reports regarding stimuli-responsive relocation of nanoparticles in a polymer blend, and could have fundamental application in gaining better understanding of the effect of particle location on the rheology and structural development of blends.
Polymer Colloids
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Author : Rodney Priestley
language : en
Publisher: Royal Society of Chemistry
Release Date : 2019-12-02
Polymer Colloids written by Rodney Priestley and has been published by Royal Society of Chemistry this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-12-02 with Science categories.
Academic and industrial research around polymer-based colloids is huge, driven both by the development of mature technologies, e.g. latexes for coatings, as well as the advancement of new materials and applications, such as building blocks for 2D/3D structures and medicine. Edited by two world-renowned leaders in polymer science and engineering, this is a fundamental text for the field. Based on a specialised course by the editors, this book provides the reader with an invaluable single source of reference. The first section describes formation, explaining basic properties of emulsions and dispersion polymerization, microfluidic approaches to produce polymer-based colloids and formation via directed self-assembly. The next section details characterisation methodologies from microscopy and small angle scattering, to surface science and simulations. The final chapters close with applications, including Pickering emulsions and molecular engineering for materials development. A comprehensive guide to polymer colloids, with contributions by leaders in their respective areas, this book is a must-have for researchers and practitioners working across polymers, soft matter and chemical and molecular engineering.
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.
Intelligent Stimuli Responsive Materials
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Author : Quan Li
language : en
Publisher: John Wiley & Sons
Release Date : 2013-09-03
Intelligent Stimuli Responsive Materials written by Quan Li 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 2013-09-03 with Technology & Engineering categories.
There has been concerted effort across scientific disciplines to develop artificial materials and systems that can help researchers understand natural stimuli-responsive activities. With its up-to-date coverage on intelligent stimuli-responsive materials, Intelligent Stimuli-Responsive Materials provides research, industry, and academia professionals with the fundamentals and principles of intelligent stimuli-responsive materials, with a focus on methods and applications. Emphasizing nanostructures and applications for a broad range of fields, each chapter comprehensively covers a different stimuli-responsive material and discusses its developments, advances, challenges, analytical techniques, and applications.