Download or read book Synthesis Characterization and Amphiphilic Self assembly of Inorganic Nanoparticles Functionalized with Polymer Brushes of Variable Composition and Chain Length written by Brian Coleman and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The synthesis, characterization and amphiphilic self-assembly of polymer brush functionalized nanoparticles (PBNPs) using a block copolymer template is described herein. To study the effect of polymer brush composition on self-assembly, four samples were created using a mixture of PS-b-PAA (polystyrene-block-polyacrylic acid) and PMMA-b-PAA (poly(methyl methacrylate)-block-polyacrylic acid) diblock copolymers to create PBNPs with a CdS quantum dot (QD) core and different ratios of PS and PMMA in the coronal brush. Static light scattering showed that despite differences in brush composition, the PBNPs formed nanoparticles of similar aggregation number and chain density but showed evidence of asymmetric structure in a common solvent for both blocks at higher PS contents. After subsequent hydrolysis of the hydrophobic PMMA to hydrophilic poly(methacrylic acid) (PMAA), these amphiphilic particles were then self-assembled in THF/H2O solution in which it was determined that increasing the hydrophobic content of the brush composition, the initial nanoparticle concentration (c0) or the added salt content (RNaCl), would cause the assembly of low curvature assemblies. Compilation of this data allowed for the construction of phase diagrams for PBNP systems based on brush composition and c0 at different salt contents. Lastly, PS-b-PAA-b-PMMA triblock copolymers with variable PMMA chain length were assembled into PBNPs around a CdS QD core using a block copolymer template approach. Light scattering showed these particles also had similar aggregation number and chain density despite the difference in PMMA chain length. After hydrolysis of PMMA to PMAA these particles were then self-assembled in THF/H2O mixtures to determine the role of PMAA block length on the produced morphological structures. The resulting assemblies suggest that chain length played a minimal role in their self-assembly.

Download or read book Single Chain Polymer Nanoparticles written by José A. Pomposo and published by John Wiley & Sons. This book was released on 2017-08-29 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt: This first book on this important and emerging topic presents an overview of the very latest results obtained in single-chain polymer nanoparticles obtained by folding synthetic single polymer chains, painting a complete picture from synthesis via characterization to everyday applications. The initial chapters describe the synthetics methods as well as the molecular simulation of these nanoparticles, while subsequent chapters discuss the analytical techniques that are applied to characterize them, including size and structural characterization as well as scattering techniques. The final chapters are then devoted to the practical applications in nanomedicine, sensing, catalysis and several other uses, concluding with a look at the future for such nanoparticles. Essential reading for polymer and materials scientists, materials engineers, biochemists as well as environmental chemists.

Download or read book Polymer mediated Metal and Metal Oxide Nanoparticles written by Litao Bai and published by . This book was released on 2009 with total page 193 pages. Available in PDF, EPUB and Kindle. Book excerpt: Functionalized nanoparticles and their assembly have been the subject of intense recent research activity. The stability and assembly of functionalized nanoparticles are still challenges for practical applications. Polymers are excellent stabilizing agents which can be used in nanoparticles synthesis. This dissertation describes polymer mediated nanoparticles which synthesized by both chemical and photo reduction techniques. The synthesis methods and assembly of polymer mediated nanoparticles were systematically studied. Two kinds of polymers were used in this research: PAMAM dendrimer and hyperbranched polyethylenimine. PAMAM dendrimer was used as the host for the synthesis of FePt nanoparticles with narrow size distribution by chemical reduction. Magnetic and structural properties of the as-made and annealed samples were studied. The as-made FePt nanoparticles have the chemically disordered fcc structure and can be transformed into the chemically ordered fct structure after annealing. But the annealing process caused both the size and size distribution to increase. To prevent size increase during annealing, dendrimer mediated alloys were encapsulated in silica microspheres. Their magnetic properties can be manipulated by synthesis conditions. Polyethylenimine is a kind of hyperbranched polymer, which was used to encapsulate nanoparticles. With polyethylenimine, Pt and Co3O4 nanoparticles were synthesized by photochemical processes. Their formation mechanisms were discussed. The chemical and electrochemical catalytic activity of polyethylenimine mediated Pt nanoparticles were studied. The results indicate that polyethylenimine is a good capping and reducing agent, and a carrier which improve samples stability and allows patterning. Ordered discrete magnetic nanoparticle arrays were also fabricated. Polyethylenimine was used as a stabilizer to synthesize magnetite nanoparticles. Polyethylenimine coating of magnetite nanoparticles can effectively prevent the aggregation of the nanoparticles. By combining the capillary filling technique with a magnetic field, polyethylenimine mediated magnetite nanoparticles form ordered assembly, in which the resolution of the pattern is doubled. The formation process of ordered structures was systematically investigated. This method is technologically feasible and scalable to make ordered magnetic nanoparticles over a large area. The result of this dissertation demonstrates that polymer stabilizers play an essential role in the synthesis of nanoparticles as well as their assembly.

Download or read book Smart Nanohybrids of RAFT Polymers and Inorganic Particles written by Bastian Ebeling and published by Springer. This book was released on 2015-04-27 with total page 311 pages. Available in PDF, EPUB and Kindle. Book excerpt: This doctoral thesis explains the synthesis and characterization of novel, smart hybrid nanomaterials. Bastian Ebeling combines in this work synthetic polymers with inorganic nanoparticles from silica or gold. The first chapters offer a comprehensive introduction to basics of polymer science and the applied methodologies. In following chapters, the author describes in detail how he systematically tailored the polymers using reversible addition-fragmentation chain transfer polymerization (RAFT) for combination with inorganic nanoparticles. This work also unravels mechanistic, thermodynamic, and structural aspects of all building blocks and reaction steps. The method described here is simple to perform and opens up pathways to new sets of nanohybrid materials with potential applications as sensors, in energy conversion, or catalysis. Readers will find a unique picture of the step-by step formation of new complex nanomaterials. It offers polymer scientists a systematic guide to the formation and synthesis of a new class of responsive nanomaterials.

Download or read book Adaptive Nanoparticle Amphiphiles as Multifunctional Particle Surfactants written by Sun Shin and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A wide range of molecules, polymers, and particles which possess both hydrophilic and hydrophobic domains are desirable as surface active agents. Unlike their molecular analogs, inorganic nanoparticle (NP) amphiphiles have the ability both to adapt their surface chemistry in response to environmental changes and to respond to external stimuli acting on the particle cores. These unique capabilities enable new strategies for a variety of applications in drug delivery, emulsification, assembly of hierarchical structures, surface coatings, and optoelectronic devices. This dissertation describes experimental methods for preparing and characterizing NP amphiphiles and also discusses their applications in assembly and biomedical engineering.The synthesis of gold NPs functionalized asymmetrically with domains of hydrophobic and hydrophilic ligands on their respective hemispheres is described in Chapter 2. These particle amphiphiles form spontaneously by a thermodynamically controlled process, in which the particle cores and two competing ligands assemble at the interface between two immiscible liquids to reduce the interfacial energy. The asymmetric surface chemistry resulting from this process is confirmed using contact angle measurements of water droplets on NP monolayers deposited onto hydrophobic and hydrophilic substrates. The spontaneous assembly process is rationalized by a thermodynamic model, which accounts both for the energetic contributions driving the assembly and for the entropic penalties that must be overcome. In addition to gold NPs and thiolate ligands, generality of this approach is demonstrated by extending it to the preparation of amphiphilic iron oxide NPs using two types of diol-terminated ligands. The synthetic strategy described here provides a comprehensive solution for designing NP amphiphiles with controlled surface composition and ligand distribution.The self-assembly of gold NP amphiphiles in water is discussed in Chapter 3. Unlike typical amphiphilic particles with "fixed" surface chemistries, the ligands used here are not bound irreversibly but can rearrange dynamically on the particles' surface during their assembly from solution. Depending on the assembly conditions, these adaptive amphiphiles form compact micellar clusters or extended chain-like assemblies in aqueous solution. By controlling the amount of hydrophobic ligands on the particles' surface, the average number of nearest neighbors -- that is, the preferred coordination number -- can be varied systematically from ~1 (dimers) to ~2 (linear chains) to ~3 (extended clusters). To explain these experimental findings, an assembly mechanism is presented in which hydrophobic ligands organize dynamically to form discrete patches between proximal NPs to minimize contact with their aqueous surroundings. Monte Carlo simulations incorporating these adaptive hydrophobic interactions reproduce the three-dimensional assemblies observed in experiment.The spontaneous incorporation of amphiphilic gold NPs into the walls of surfactant vesicles is reported in Chapter 4. When the NP amphiphiles are mixed with preformed surfactant vesicles, the hydrophobic ligands on the NP surface interact favorably with the hydrophobic core of the bilayer structure and guide the incorporation of NPs into the vesicle walls. Unlike previous strategies based on small hydrophobic NPs, the approach described here allows for the incorporation of water soluble particles even when the size of the particles greatly exceeds the bilayer thickness.Finally, a strategy to stabilize open bilayer structures using NP amphiphiles is described in Chapter 5. Molecular amphiphiles self-assemble in polar media to form ordered structures such as micelles and vesicles essential to a broad range of industrial and biological processes. Some of these architectures such as bilayer sheets, helical ribbons, and hollow tubules are potentially useful but inherently unstable owing to the presence of open edges that expose the hydrophobic bilayer core. The particle amphiphiles described here bind selectively to the open edge of bilayer membranes to stabilize otherwise transient amphiphile assemblies. It is demonstrated how such particles can precisely control the size of lipid tubules, how they can inhibit the formation of undesirable assemblies such as gallstone precursors, and how they can stabilize free-floating lipid microdiscs.

Download or read book Advanced Polymer Nanoparticles written by Vikas Mittal and published by CRC Press. This book was released on 2010-07-13 with total page 613 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polymer latex particles continue to become increasingly important in numerous commercial applications. Advanced synthesis techniques are the key to developing new functionality for nanoparticles. These methods make it possible to tailor the size, chemical composition, or properties of these particles, as well as the molecular weight of the polymer

Download or read book Polymer and Polymer hybrid Nanoparticles written by STANISLAV. PISPAS RANGELOV (ASTERIOS.) and published by CRC Press. This book was released on 2019-08-30 with total page 499 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polymeric and hybrid nanoparticles have received increased scientific interest in terms of basic research as well as commercial applications, promising a variety of uses for nanostructures in fields including bionanotechnology and medicine. Condensing the relevant research into a comprehensive reference, Polymer and Polymer-Hybrid Nanoparticles: From Synthesis to Biomedical Applications covers an array of topics from synthetic procedures and macromolecular design to possible biomedical applications of nanoparticles and materials based on original and unique polymers. The book presents a well-rounded picture of objects ranging from simple polymeric micelles to complex hybrid polymer-based nanostructures, detailing synthetic procedures, techniques for characterization and analysis, properties, and behavior in selective solvents and dispersions. Each chapter contains background and introductory information, summarizing generalities on the nanosystems being discussed. The chapters also describe representative works of experts and provide in-depth, focused discussions. The authors present current knowledge on the following topics: Designed synthesis of functional polymers Construction of block copolymer micellar and nonmicellar self-assembled structures Construction of organic-organic hybrid nanosized particles Construction of organic-inorganic hybrid nanoparticles and nanoassemblies The final chapter addresses biological applications of polymeric nanoparticles, including delivery of low-molecular-weight drugs, macromolecular drugs, imaging and diagnostics, and photodynamic therapy. Summarizing important developments in the field, the authors condense relevant research into a comprehensive resource.

Download or read book Polymer Composites with Functionalized Nanoparticles written by Krzysztof Pielichowski and published by Woodhead Publishing. This book was released on 2018-09-22 with total page 513 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polymer Composites with Functional Nanoparticles: Synthesis, Properties, and Applications reviews the latest research in the area of polymer nanocomposites and functionalized nanoparticles, providing an introduction for those new to the field, and supporting further research and development. The book helps researchers and practitioners better understand the key role of nanoparticle functionalization for improving the compatibility of inorganic metallic nanomaterials with organic polymers, and for the fabrication of nanostructured materials with special properties. A range of nanoparticles, such as carbon nanotubes are covered, along with descriptions of the methods of functionalization to support better compatibility with polymer matrices. The book also discusses the various applications of this technology, including uses in electronics and the medical and energy industries. - Summarizes the latest research in functionalized nanoparticles for modification of polymer matrices, providing a valuable platform for further research - Includes functionalization of a range of nanoparticles for incorporation into nanocomposites, including carbon nanotubes, graphene, gold and silver, silica and clay - Provides detailed coverage of application areas, including energy, electronics, biomedical applications, and end-of-life considerations

Download or read book Inorganic Particle Synthesis via Macro and Microemulsions written by Dibyendu Ganguli and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Nanotechnology" is now very well known as one of the most important key technologies in science and industry. In the field of material science and engineering, nanoparticles should be unit materials, as well as atoms and molecules, to build ceramics, devices, catalysts, and machines, and the "nanoparticle technology" is thus attracting. This novel technology includes various methodologies for nanoparticles: preparation, surface-modification via chemical and/or physical treatments, immobilization and arrangement on supports or substrates, to achieve high performance for luminescence properties in light emitting devices, and high efficiency for catalytic and photocatalytic reactions in chemical synthesis, chemical decomposition, and artificial photosynthesis, etc. It should be needless to say that the preparation of nanoparticles, having precisely controlled particle size, size distribution, chemical composition, and surface properties, is essentially important to realize "true nanoparticle technology". This book, written by Dr. Dibyendu Ganguli and Dr. Munia Ganguli, deals with the preparation methodologies for inorganic nanoparticles using macro- and microemulsions as "microreactor". There are several differences between these two emulsions, in addition to water droplet size: thermodynamic stability, and fusion-redispersion dynamics of the droplets. The properties of the nanoparticles prepared in these emulsion systems are seriously influenced and controlled by the selection of dynamic and static conditions.

Download or read book Design Synthesis and Self assembly of Well defined Hybrid Materials Including Polymer Amphiphiles and Giant Tetrahedra Molecules Based on POSS Nanoparticles written by Mingjun Huang and published by . This book was released on 2015 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Bottom-up" techniques-based self-assembly are always attracting people's interests since this technology provides relatively low economic cost and fast route to construct organized structures at different scales. Considering unprecedented benefits from polymer materials, self-assemblies utilizing polymer building blocks have been extensively studied to achieve diverse hierarchical structures and various attractive properties. However, precise controls of chemical primary structures and compositions and exact constructions of hierarchal ordered structures in synthetic polymers are far from being fully appreciated. In this dissertation, a novel approach has been utilized to construct diverse well-defined nano-building blocks, giant molecules, via conjugating different, and functionalized molecular nanoparticles (MNPs) which are shape- and volume-persistent nano-objects with precise molecular structure and specific symmetry. The representative examples of the three basic categories of giant molecules, "giant polyhedra", "giant surfactants", and "giant shape amphiphiles" were discussed in details. First, a class of precisely defined, nanosized giant tetrahedra was constructed by placing different polyhedral oligomeric silsesquioxane (POSS) molecular nanoparticles at the vertices of a rigid tetrahedral framework. Designed symmetry breaking of these giant tetrahedra introduces accurate positional interactions and results in diverse selectively assembled, highly ordered supramolecular lattices including a Frank-Kasper (FK) A15 phase. The FK and quasicrystal phases are originally identified in metal alloys and only sporadically observed in soft matters. It remains unclear how to correlate their stability with the chemical composition and molecular topology in the self-assembling systems. We then for this purpose designed and studied the self-assembly phase transition sequences of four series of hybrid giant surfactants based on hydrophilic POSS cages tethered with one to four polystyrene (PS) tails. With increasing the number of tails, molecular topological variations not only affect phase boundaries in terms of the PS volume fraction, but also open a window to stabilize supramolecular FK and quasicrystal phases in the spherical phase region, demonstrating the critical role of molecular topology in dictating the formation of unconventional supramolecular lattices of "soft" spherical motifs. The FK A15 phase was even surprisingly observed in the giant shape amphiphile molecule, triphenylene-6BPOSS, which has a disk-like flat triphenylene core connected with six hydrophobic POSS cages by sides. Without conical molecular shape, triphenylene-6BPOSS self-assembled and stabilized into supramolecular sphere via p-p interactions through a completely different mechanism with precious two cases. These studies indicate that "bottom-up" self-assemble based on well-defined giant molecules approach can be rather powerful to fabricate usually complicated hierarchical structures and open up a wide field of supramolecular self-assembly with unexpected structure and properties.

Download or read book Materials Nanoarchitectonics written by Katsuhiko Ariga and published by Elsevier. This book was released on 2023-12-07 with total page 648 pages. Available in PDF, EPUB and Kindle. Book excerpt: Materials Nanoarchitectonics: From Integrated Molecular Systems to Advanced Devices provides the latest information on the design and molecular manipulation of self-organized hierarchically structured systems using tailor-made nanoscale materials as structural and functional units. The book is organized into three main sections that focus on molecular design of building blocks and hybrid materials, formation of nanostructures, and applications and devices. Bringing together emerging materials, synthetic aspects, nanostructure strategies, and applications, the book aims to support further progress, by offering different perspectives and a strong interdisciplinary approach to this rapidly growing area of innovation. This is an extremely valuable resource for researchers, advanced students, and scientists in industry, with an interest in nanoarchitectonics, nanostructures, and nanomaterials, or across the areas of nanotechnology, chemistry, surface science, polymer science, electrical engineering, physics, chemical engineering, and materials science. - Offers a nanoarchitectonic perspective on emerging fields, such as metal-organic frameworks, porous polymer materials, or biomimetic nanostructures - Discusses different approaches to utilizing "soft chemistry" as a source for hierarchically organized materials - Offers an interdisciplinary approach to the design and construction of integrated chemical nano systems - Discusses novel approaches towards the creation of complex multiscale architectures

Download or read book Polymeric Amphiphilic Nanoparticles Via Intramolecular Chain Collapse Using 1 functionalized Vinylbenzocyclobutenes written by William Kenneth Storms and published by . This book was released on 2015 with total page 207 pages. Available in PDF, EPUB and Kindle. Book excerpt: Synthetic routes to 1-functionalized 4-vinylbenzocyclobutenes were developed with cyano, ester, amide and acetoxy 1-functional groups. The synthesis of a high molecular weight diblock quaterpolymer (i.e. two block, with two monomers in each block), where the blocks were highly immiscible (hydrocarbon/aliphatic fluorocarbon) and each contained a thermal crosslinker with a distinct curing temperature range, i.e. a "low" temperature crosslinker and a "high" temperature crosslinker by sequential polymerization using controlled radical polymerization was investigated. The synthesis of the desired diblock quaterpolymer was difficult or impossible due to radical chain transfer to 1-ethoxybenzocylcobutene. Fast chain-transfer to 1-ethoxybenzocyclobutene caused the polymerization to be inefficient and poorly controlled. Using a combination of ATRP and post-polymerization functionalization via the nucleophilic aromatic substitution of poly(pentafluorostyrene), a modular route to a strongly phase segregating benzocyclobutene functional diblock quaterpolymer was established. A linear diblock quaterpolymer was collapsed in two steps under pseudo-high dilution conditions into an amphiphilic single chain nanoparticle. Characterization of the soft organic particles by GPC, 1H- and 19F-NMR spectroscopy, atomic force microscopy, and transmission electron microscopy confirmed that they were single-chain particles. As part of a plan to possibly prepare the desired strongly phase segregating diblock copolymers by polymer-polymer conjugation using copper catalyzed azide-alkyne cycloaddition, the ATRP of styrene initiated from the popular alkyne functional initiator, prop-2-yn-1-yl 2-brom-2-methylpropanoate (PBiB), was systematically investigated. Using polymerization studies of PBiB a non-degenerative chain coupling side reaction was shown to be occurring. By repeating this study with similar protected alkyne functional ATRP initiators the side reaction was shown to be occurring due to the presence of a terminal alkyne. 1H-NMR studies supported these findings, specifically showing that unprotected terminal alkynes can undergo oxidative alkyne-alkyne coupling under ATRP conditions.

Download or read book Self Assembly and Surface Patterning of Polymer Functionalized Nanoparticles written by Rachel Choueiri and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis explores the preparation of polymer-functionalized nanoparticles, the surface-segregation of their polymer ligands to generate patchy nanocolloids, and the use of patchy and non-patchy polymer-functionalized nanoparticles as building blocks for self-assembly. In Chapter 3, the self-assembly of nanospheres uniformly functionalized with polymer was explored. Both chain-like and globular structures were generated from the same spherical nanoparticle building blocks by tuning the interplay of nanoscale forces. The molecular weight of polymer ligands and the polarity and ionic strength of the self-assembly medium were changed to adjust the interparticle hydrophobic attraction and electrostatic repulsion in order to obtain the desired self-assembled structure. The experimental results were in agreement with theoretical predictions for the most thermodynamically favourable self-assemblies. Hierarchical structures made from assembled globules of nanospheres were also generated and the reversibility of the self-assemblies was demonstrated. In Chapter 4, the segregation of polymer ligands into pinned micelles on the surface of nanospheres was explored. Single and multi-patch nanospheres were generated by studying the interplay of nanosphere curvature and polymer molecular weight. The statistics of patchy nanosphere species was quantified and compared to theoretical predictions. Permanent crosslinking of polymer patches was achieved in addition to tomography of the generated colloids to further characterize the morphology. In Chapter 5, the surface segregation of polymer ligands on nanoparticles with different shapes and composition such as spherocylindrical nanorods, nanorods with a dumbbell shape, and nanocubes was demonstrated. The surface segregation of different polymers (including pH-responsive and conductive polymers) on nanospheres was also achieved demonstrating the versatility of the polymer segregation approach for nanopatterning. In addition, the self-assembly of patchy nanospheres and nanocubes was explored yielding new self-assembled structures such as an open checkerboard formed from patchy nanocubes. The use of one-patch nanospheres as colloidal surfactants stabilizing a solvent-polymer interface was also achieved.

Download or read book Synthesis of Highly Functionalized Polymers written by RI Chen and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Highly functionalized polymers represent a broad family of polymers with multiple functionalities attached to each repeat unit in the backbone. These can be small molecule functional groups or polymer sidechains grown or grafted from these functional groups. The latter leads to a class of polymers defined as comb polymers. This type of structure enforces a highly stretched conformation of the polymer backbone and imparts unique properties due to low inter chain entanglement and low entropic penalty for self-assembly. The comb polymers have a diverse set of architectures and compositions with potential applications in surface modification, resin formulation and nanopatterning. To realize this potential, efficient, versatile and easy-to-handle synthetic methods need to be constantly evolved. This dissertation focuses on the synthesis of comb polymers based on a new monomer and the application of multi-component reactions to reduce synthetic complexity. The first part of this dissertation focuses on the design of a benign formamide monomer capable of undergoing isocyanide-based multi-component reaction. The synthesis, polymerizability, reactivity and stability of this monomer is studied, along with its utility in the synthesis of comb polymers. Specifically, a difunctional polymerizable initiator (Y-inimer) that can be used for two tandem controlled polymerizations is designed from the formamide monomer. The utility of this Y-inimer is demonstrated through the synthesis of a comb polymer with 1:1 ratio of A and B chains, and A/B mixed polymer brushes from a substrate where intimate contact between the A and B chains is beneficial for exploring polyelectrolyte behavior. Finally, a comb polymer-based block copolymer additive is explored for synergistically improving the toughness and strength of a 3D printable epoxy resin. The main contribution of this dissertation lies in the 1) design of benign monomer that can be used in isocyanide-based multicomponent reactions to design highly functional polymers, without having to directly handle the isocyanide, 2) development of a dualfunctional polymerizable initiator for the synthesis of comb polymers with exact 1:1 ratio of A and B sidechains, and 3) development of a comb polymer additive for toughening of epoxy resin without loss of modulus or rheological properties.

Download or read book Self Assembled Nanomaterials I written by Toshimi Shimizu and published by Springer Science & Business Media. This book was released on 2008-09-26 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text was ranked by ISI as having the Highest Impact Factor of all publications within Polymer Science. It is a collection of concise reports on the physics and chemistry of polymers.

Download or read book Synthesis of Hybrid Nanomaterials Through Amphiphilic Self assembly written by Qingjie Luo and published by . This book was released on 2016 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: Finally we developed a strategy to self-assemble DNA-functionalized gold nanoparticles into macroscopic sheets assisted by DNA-tethered lipid bilayers. By varying the amount of gold nanoparticles input, the surface coverage can be tuned. Our approach provides a new method for the preparation of versatile scaffolds for nanofabrication and paves the way for organizing functional nanoparticles in a micrometer space.

Download or read book Functional Polymer Grafted Nanoparticles Synthesis Characterization and Applications written by Yunping Fei and published by . This book was released on 2016 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt: Incorporating nanoparticles and polymers into one composite material have opened new pathways for generating novel material structures and advancing the properties of conventional materials. The developments in the field of nanocomposites have been accelerated by the progress in fabrication of nanoparticles with designed shape and precise size control, surface modification techniques covering a variety of nano-scale materials including clay sheets, carbonaceous materials, metal oxide particles, etc., as well as new syntheses of polymers with targeted architecture and functionality. The control of interfacial interactions is the key to property enhancement of almost all nanocomposite materials. Grafting polymer chains directly onto the surface of nanoparticles is a relatively new approach for obtaining novel nanocomposite structures and it offers better control of grafting density and maximizes the interfacial interactions between nanoparticles and polymeric matrices. The first project in this thesis describes the preparation of nanocomposites via surface initiated polymerization of block copolymer chains directly from the surface of montmorillonite clay. A ‘graft-from’ synthesis protocol was developed for the preparation of the nanocomposites. Comprehensive material characterization was performed to understand the structure and properties of the nanocomposites. Crystallization behavior of the bulk material and optical properties of nanocomposite films were examined. The relationship between material synthesis, structure and properties is also discussed in these chapters. The second project involves grafting polyelectrolytes onto magnetic nanoparticles for the application of electromagnetic imaging in high temperature, high salinity gas and oil reservoir environments. The fabrication of magnetic nanoparticles is described with a focus on both size control and achieving colloidal stability. The synthesized nanoparticles were used as core materials for their outstanding magnetic properties. Subsequent surface functionalization and a ‘grafting-to’ method was developed to coat the nanoparticles with a surface layer of polyelectrolytes, which provides nanoparticles with excellent transport mobility for high temperature, high salinity aqueous flow conditions through porous rock and sediment.