Download or read book Surface directed Patterning of Polymer nanoparticle Assemblies on Microcontact printed Substrates written by Saman Harirchian-Saei and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Surface directed Patterning of Polymer written by Saman Harirchian-Saei and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Two different strategies for producing hierarchical polymer/nanoparticle (NP) patterned structures are presented in this work. The first strategy combines self-assembly of amphiphilic block copolymers at the air-water interface with microscale template assembly of the resulting aggregates on chemically-patterned substrates. Aggregates are formed via interfacial self-assembly of 141k polystyrene-block-poly (ethylene oxide) (PS-b-PEO, Mw=141 k) or a blend of PS-b-PEO (Mw=185 k) and PS-coated CdS (PS-CdS) quantum dots (QDs), to form aggregates of copolymer or copolymer/NP. Using Langmuir-Blodgett (LB) technique, the formed aggregates are then transferred to patterned substrates with alternating hydrophilic/hydrophobic stripes, obtained by microcontact printing (?CP) octadecyltrichlorosilane (OTS) on glass. The effect of different parameters including surface pressure, orientation of the patterned substrate respect to the air-water interface, and withdrawal speed was studied. Successful aggregate transfer to the hydrophilic domains of the patterned hydrophilic/hydrophobic substrate is achieved when patterned stripes are oriented perpendicular to the water surface during LB transfer and when substrates are withdrawn at low speed and low compression pressure. The second strategy combines the phase-separation of immiscible polymer blends during spin-coating with?CP. We show the surface-directed patterning of a phase-separating polymer blend on optically-transparent (OTS)-patterned glass substrate obtained via?CP. First, morphologies and pattern registration of thin spin-coated films of PS (Mw=131 k)/ poly(methyl methacrylate) (PMMA, Mw= 120 k) blends on patterned glass with alternating hydrophilic/hydrophobic stripes is studied for a range of experimental conditions including polymer concentration, blend composition, solvent, and spin rate. Good registration of polar PMMA to hydrophilic glass surface and non-polar PS to hydrophobic OTS lines is found under conditions, where polymer domain sizes are commensurate with the pattern periodicity. Next, we apply this method to pattern NPs using blends of PMMA and PS-CdS QDs via spin-coating onto OTS-patterned glass. Ultimately the method was extended to simultaneously pattern multi-NP functional assemblies using PS-CdS and a sample of PMMA-coated silver NP (PMMA-Ag). The specific interest in patterns of Ag NPs and CdS QDs is to provide a suitable proof-of-concept system for simultaneous multi-NP patterning. However, this system also has some interesting optical behaviour as a result of QD-surface plasmon interactions that is investigated in details. The challenge in PS-CdS/PMMA-Ag NPs patterning is the gelation as the solvent evaporates during spin-coating that restricts the NPs mobility and constraints their phase-separation. We show that adding homopolymers to the NPs blends prevents the overlap of approaching NP brushes and prevents the resulting gelation. Feature sizes were then fine-tuned by changing solution concentration and spin rate, in order to obtain NPs domains which can be surface-directed on OTS-patterned glass substrates.
Download or read book Nanoimprinting directed Assembly of Polymer grafted Nanoparticles in Polymer Thin Films written by Xiaoteng Wang and published by . This book was released on 2019 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: Controlled dispersion and distribution of functional nanoparticles (NPs) in polymer matrix is prerequisite for improved properties of the composite materials. How to control the distribution of NPs in a facile manner remains to be a recurring challenge in the applications of polymer nanocomposites (PNCs). Surface functionalization of NPs with polymer brushes has emerged as an effective and versatile platform of tuning the interactions between the nanoparticles and the polymer hosts, allowing their integration into polymer nanocomposites. The current work aims to understand the phase behaviors of polymer-grafted nanoparticles (PGNPs) in polymer thin films and further control the spatial distribution of PGNPs through the interactions between the grafted and matrix polymer chains. In particular, polystyrene-grafted titanium dioxide nanoparticles (PS-TiO2) embedded in polystyrene (PS) thin film matrices having an initial film thickness h0 » 90 nm were investigated, where fluctuations in the grafting brush layer enables the formation of self-assembled PGNP clustering structures. Nanoimprinting directed lateral organization of the PGNP clusters in polymer thin films via topographically soft-pattern confinement was demonstrated. The PGNP clusters segregate to thicker film regions where they are less confined during thermal annealing. The partitioning of the PGNP clusters to the patterned regions was quantified by introducing the cluster partition coefficient Kc. It shows that the highly selective segregation of the clusters was driven by entropic driving forces while the film surface homogenization and shape transition of the clusters were induced by geometrical confinement of the nanopatterning. Simultaneously, the stability of the low molecular weight PS thin films is greatly enhanced against dewetting by the addition of PGNPs. The extent of the dewetting suppression depends on the PGNP concentration and can also be altered by nanopatterning. This form of soft pattern-directed self-assembly may boost colligative properties and provide enhanced and anisotropic optical such as UV-Vis, electronic and other material properties associated with organized NP clusters into precise large-scale patterns. With better understanding of the chemically identical blend systems, we further extend our model study to other PGNP/polymer blends where enthalpic interactions also participate in the phase behavior. The hybrid blend system composed of polystyrene-grafted silica nanoparticles in a poly (vinyl methyl ether) (PS-SiO2/PVME) blend thin film (≈100 nm) was studied where the brush and matrix polymers exhibit LCST type of phase behavior. Phase separation between the polymer-grafted nanoparticles (PGNPs) and matrix polymer occurs at a temperature ≈ 40° C lower than the LCST of classic binary linear PS/PVME polymer blends. Spatially organized PGNP domain structures on submicrometer scale were illustrated by introducing the symmetry-breaking soft elastomer pattern. Selective partition of the nanoparticles in both one-phase and two-phase regions can be obtained via nanoimprinting. Thermal cycling of the composite film through the critical temperature allows for thermodynamically reversible formation and dissolution of PGNP-rich domain structures. This nanoimprinting guided assembly of PGNPs in polymer nanocomposites would open pathways of novel hybrid materials for many technological applications such as responsive materials.
Download or read book Tailoring Surfaces Modifying Surface Composition And Structure For Applications In Tribology Biology And Catalysis written by Nicholas D Spencer and published by World Scientific. This book was released on 2011-03-08 with total page 690 pages. Available in PDF, EPUB and Kindle. Book excerpt: The focus of this book is surface modification, with the goal of tailoring materials for a specific application. By means of this approach, ideal bulk properties of a material, such as its tensile strength (temperature stability, density, or even cost) can be combined with optimized surface properties, such as hardness, biocompatibility, low or high friction or adhesion, water repellency or wettability, or catalytic activity.The works of the author — many of his crucial papers are included — deal with the understanding and modification of surfaces and span fields including catalysis, analytical surface science, self-assembled monolayers, tribology, biomaterials, superhydrophobicity and polymer coatings.
Download or read book Nanoparticulate Materials written by Kathy Lu and published by John Wiley & Sons. This book was released on 2012-09-25 with total page 379 pages. Available in PDF, EPUB and Kindle. Book excerpt: Serving as the only systematic and comprehensive treatment on the topic of nanoparticle-based materials, this book covers synthesis, characterization, assembly, shaping and sintering of all types of nanoparticles including metals, ceramics, and semiconductors. A single-authored work, it is suitable as a graduate-level text in nanomaterials courses.
Download or read book Evaporative Self assembly of Ordered Complex Structures written by Zhiqun Lin and published by World Scientific. This book was released on 2012 with total page 395 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of spontaneous self-assembly, as a lithographic tool and as an external field-free means to construct well-ordered and intriguing patterns, has received much attention. This book offers a spectrum of experimental and theoretical advances in evaporative self-assembly techniques.
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 Directed Self assembly of Block Co polymers for Nano manufacturing written by Roel Gronheid and published by Woodhead Publishing. This book was released on 2015-08-06 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The directed self-assembly (DSA) method of patterning for microelectronics uses polymer phase-separation to generate features of less than 20nm, with the positions of self-assembling materials externally guided into the desired pattern. Directed self-assembly of Block Co-polymers for Nano-manufacturing reviews the design, production, applications and future developments needed to facilitate the widescale adoption of this promising technology. Beginning with a solid overview of the physics and chemistry of block copolymer (BCP) materials, Part 1 covers the synthesis of new materials and new processing methods for DSA. Part 2 then goes on to outline the key modelling and characterization principles of DSA, reviewing templates and patterning using topographical and chemically modified surfaces, line edge roughness and dimensional control, x-ray scattering for characterization, and nanoscale driven assembly. Finally, Part 3 discusses application areas and related issues for DSA in nano-manufacturing, including for basic logic circuit design, the inverse DSA problem, design decomposition and the modelling and analysis of large scale, template self-assembly manufacturing techniques.
Download or read book Directed Nano Patterning of Polymer Nanocomposite Thin Films written by Xiaoteng Wang and published by . This book was released on 2016 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polymer-nanoparticle (NP) composites have been studied extensively as a core material that exhibits advantageous optical, electrical and mechanical properties in nanotechnology. It has been well-established that a specific distribution state of nanoparticles in a polymer matrix is the key issue to optimize a desired polymer nanocomposite (PNC) property. However effective way of controlling the spatial distribution of nanoparticles is still a recurring challenge. Here we demonstrated facile processing approach to fabricate nanocomposite thin films with controlled nanoparticle dispersion state by exploiting the entropic interactions, thereby controlling the macroscopic performance of the material. The interactions of nanoparticles with polymers are mediated by the ligands attached to the nanoparticles. Location and dispersion of polystyrene grafted titanium dioxide (PS-g-TiO2) and hydroxyl-functionalized polyhedral oligomeric silsesquioxanes (DPOSS) molecular nanoparticles in homopolymer matrices under various annealing conditions were investigated. PS-g-TiO2 NP filled low molecular weight polystyrene thin films were thermally annealed under nanoscale pattern confinement, which was fabricated by imprinting digital recording media discs (DVD) pattern onto polydimethylsiloxane (PDMS). The NP dispersion changed from randomly distributed to aggregating at the elevated regions of the imprinted films due to the entropic interaction caused by the size difference between the particles and the matrix chains. DPOSS-PS is a type of giant shape amphiphiles which are built up by covalent bonding of molecular nanoparticles. When added to low molecular weight homopolymer matrices, DPOSS-PS nanoparticles exhibited better dispersion in PMMA than in PS matrix. Additionally, to understand the morphology transition and phase separation kinetics, various loading fraction of DPOSS-PS were incorporated into PMMA matrix. Phase separation at multiple length scales was observed when the composition of DPOSS-PS is in the range of 5% and 70%.
Download or read book Nanoparticles Patterning by Directed Electric Field Assembly and Photolithography written by Youngjun Song and published by . This book was released on 2014 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recently, the integration of a wide range of nanocomponents has been investigated for building patterned or layered structures on the macroscopic and mesoscopic scale. In order to break through the issues of current devices and develop diverse and reliable applications from nanobiomaterials to nanoelectronics, it is necessary to fabricate nano-devices and systems using nanocomponents. However, traditional fabrication methods have required the modification of these nanomaterials, and need new approaches for the advancement of development for diverse and reliable applications. In this dissertation, two novel methods are demonstrated for pragmatic nano devices and systems : Controlling extrinsic nanoparticle alignment by electrical field deposition, and intrinsic DNA binding through photolithography. First, the use of nanoparticles' electrophoretic deposition (EPD) onto porous biodegradable polymer allows the production of transparent flexible carbon nanotube network films with mechanical strength. Most importantly, after solvent treatment, the opaque substrate changed to transparent with conductivity. Thus, we produced flexible transparent films. Another unique aspect of this process is that after solvent treatment, the substrate can be implanted onto newspapers or cloth. Second, we demonstrate a DNA double write process that represents, which allows DNA to be used as a unique material for UV patterning, with subsequent selfassembly via the hybridization of complementary DNA sequences. This novel method allows true synergy for combining top-down photolithography with bottom-up selfassembly. In addition, we have been able to demonstrate both first- and second-level patterning, including target sequence detection and streptavidin /biotin binding with the DNA double write process.
Download or read book Surface Patterning of Polymer functionalized Gold Nanoparticles written by Linye Chen and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polymer patterning on nanoparticles has been recently achieved on polymer-grafted nanoparticles, opening doors to more advanced nanofabrication and self-assembly. However, patchy nanoparticles are mostly prepared using homopolymers under unfavorable solvent. Fabrication conditions and tendency to aggregate at high concentrations limit their throughput and potential utilization. This thesis aims to improve the long-term stability of patchy nanoparticles by using block copolymers as well as mixed polymer brushes. A block copolymer, polystyrene-b- poly(4-vinylbenzoic acid) (PS-b-P4VBA), was used to produce patchy nanocubes. It was that found not only could patchy nanocubes be obtained using PS-b-P4VBA, but also the aggregation of patchy nanoparticles was largely prevented by the P4VBA outer block. Alternatively, mixed polymer brushes of polystyrene and polyethylene glycol were employed to produce patchy nanorods. Due to their microphase separation, gold nanorods carrying helical patches were successfully obtained at certain grafting ratios between the two polymers, even in a good solvent environment.
Download or read book Modern Inorganic Synthetic Chemistry written by Ruren Xu and published by Elsevier. This book was released on 2017-02-11 with total page 810 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modern Inorganic Synthetic Chemistry, Second Edition captures, in five distinct sections, the latest advancements in inorganic synthetic chemistry, providing materials chemists, chemical engineers, and materials scientists with a valuable reference source to help them advance their research efforts and achieve breakthroughs. Section one includes six chapters centering on synthetic chemistry under specific conditions, such as high-temperature, low-temperature and cryogenic, hydrothermal and solvothermal, high-pressure, photochemical and fusion conditions. Section two focuses on the synthesis and related chemistry problems of highly distinct categories of inorganic compounds, including superheavy elements, coordination compounds and coordination polymers, cluster compounds, organometallic compounds, inorganic polymers, and nonstoichiometric compounds. Section three elaborates on the synthetic chemistry of five important classes of inorganic functional materials, namely, ordered porous materials, carbon materials, advanced ceramic materials, host-guest materials, and hierarchically structured materials. Section four consists of four chapters where the synthesis of functional inorganic aggregates is discussed, giving special attention to the growth of single crystals, assembly of nanomaterials, and preparation of amorphous materials and membranes. The new edition's biggest highlight is Section five where the frontier in inorganic synthetic chemistry is reviewed by focusing on biomimetic synthesis and rationally designed synthesis. - Focuses on the chemistry of inorganic synthesis, assembly, and organization of wide-ranging inorganic systems - Covers all major methodologies of inorganic synthesis - Provides state-of-the-art synthetic methods - Includes real examples in the organization of complex inorganic functional materials - Contains more than 4000 references that are all highly reflective of the latest advancement in inorganic synthetic chemistry - Presents a comprehensive coverage of the key issues involved in modern inorganic synthetic chemistry as written by experts in the field
Download or read book Biomaterials Science written by Buddy D. Ratner and published by Academic Press. This book was released on 2012-12-31 with total page 1610 pages. Available in PDF, EPUB and Kindle. Book excerpt: The revised edition of this renowned and bestselling title is the most comprehensive single text on all aspects of biomaterials science. It provides a balanced, insightful approach to both the learning of the science and technology of biomaterials and acts as the key reference for practitioners who are involved in the applications of materials in medicine. - Over 29,000 copies sold, this is the most comprehensive coverage of principles and applications of all classes of biomaterials: "the only such text that currently covers this area comprehensively" - Materials Today - Edited by four of the best-known figures in the biomaterials field today; fully endorsed and supported by the Society for Biomaterials - Fully revised and expanded, key new topics include of tissue engineering, drug delivery systems, and new clinical applications, with new teaching and learning material throughout, case studies and a downloadable image bank
Download or read book Chemical Abstracts written by and published by . This book was released on 2002 with total page 2364 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Surface Enhanced Raman Scattering written by Zhong-Qun Tian and published by John Wiley & Sons Incorporated. This book was released on 2010-06-14 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface-Enhanced Raman Spectroscopy: Principles, Experiments, and Applications is a comprehensive, up to date, and balanced treatment of the theoretical and practical aspects of Surface-Enhanced Raman Scattering (SERS), a useful branch of spectroscopy for several areas of science. This book describes the basic principles of SERS, including SERS mechanisms, performing SERS measurements, and interpreting data. Also emphasized are applications in electrochemistry; catalysis; surface processing and corrosion; Self-Assemble-Layer and L-B Films; polymer science; biology; medicine and drug analysis; sensors; fuel cells; forensics; and archaeology. It is an essential guide for student and professional analytical chemists.
Download or read book Biomaterials Science written by William R Wagner and published by Academic Press. This book was released on 2020-05-23 with total page 1612 pages. Available in PDF, EPUB and Kindle. Book excerpt: The revised edition of the renowned and bestselling title is the most comprehensive single text on all aspects of biomaterials science from principles to applications. Biomaterials Science, fourth edition, provides a balanced, insightful approach to both the learning of the science and technology of biomaterials and acts as the key reference for practitioners who are involved in the applications of materials in medicine.This new edition incorporates key updates to reflect the latest relevant research in the field, particularly in the applications section, which includes the latest in topics such as nanotechnology, robotic implantation, and biomaterials utilized in cancer research detection and therapy. Other additions include regenerative engineering, 3D printing, personalized medicine and organs on a chip. Translation from the lab to commercial products is emphasized with new content dedicated to medical device development, global issues related to translation, and issues of quality assurance and reimbursement. In response to customer feedback, the new edition also features consolidation of redundant material to ensure clarity and focus. Biomaterials Science, 4th edition is an important update to the best-selling text, vital to the biomaterials’ community. The most comprehensive coverage of principles and applications of all classes of biomaterials Edited and contributed by the best-known figures in the biomaterials field today; fully endorsed and supported by the Society for Biomaterials Fully revised and updated to address issues of translation, nanotechnology, additive manufacturing, organs on chip, precision medicine and much more. Online chapter exercises available for most chapters
Download or read book ICO20 written by Masayoshi Esashi and published by SPIE-International Society for Optical Engineering. This book was released on 2006 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of SPIE present the original research papers presented at SPIE conferences and other high-quality conferences in the broad-ranging fields of optics and photonics. These books provide prompt access to the latest innovations in research and technology in their respective fields. Proceedings of SPIE are among the most cited references in patent literature.
