Academic literature on the topic 'Monodispers'

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Journal articles on the topic "Monodispers"

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Boutevin, Bernard, Messaoud Chaib, and Jean-Jacques Robin. "Synthesis of monodispers macromolecular diisocyanate." Polymer Bulletin 26, no. 2 (1991): 177–79. http://dx.doi.org/10.1007/bf00297523.

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Bi, Shu Xian, and Xiao Liang Zhang. "Nanomagnetic Particle Anchored to Monodispers Porous Microspheres for Pectinase Immobilization." Advanced Materials Research 1088 (February 2015): 38–42. http://dx.doi.org/10.4028/www.scientific.net/amr.1088.38.

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The idea of preparing the surface of chitosan layer pre-absorbed on the monodispers porous microsphere via layer by layer approach receives special relevance in enzyme technology. Moreover, the colloidal stability is not impeded by the adsorbed proteins despite the fact that up to 390.2 mg of enzyme adsorbed per gram of the carrier particles. Maximum relative activity was observed at 50 °C and pH 3.5. The activity half lives for native and bound states of enzyme were found as 14.27 d and 31.05 d, respectively. These particles, premodified with the layer of magnetic nanoparticles to impart the magnetic property, were repeatedly used as catalysts following their rapid and easy separation.
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Bruijnzeel, P. L. B. "Farmacokinetiek van geïnhaleerd monodispers beclometason als functie van de deeltjesgrootte." Medisch-Farmaceutische Mededelingen 46, no. 6 (June 2008): 101–2. http://dx.doi.org/10.1007/bf03077028.

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Ali, Nisar, Baoliang Zhang, Hepeng Zhang, Wajed Zaman, Sarmad Ali, Zafar Ali, Wei Li, and Qiuyu Zhang. "Monodispers and Multifunctional Magnetic Composite Core Shell Microspheres for Demulsification Applications." Journal of the Chinese Chemical Society 62, no. 8 (August 2015): 695–702. http://dx.doi.org/10.1002/jccs.201500151.

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Agustina, Agustina, Munawarah Munawarah, Stefanus Agustinus Lumi, and Syamsu Nur. "Green Synthesis Nanopartikel Perak (Agnps) Terkonjugasi Etil Parametoksi Sinamat (Epms) sebagai Bahan Tabir Surya." Jurnal Farmasi Galenika (Galenika Journal of Pharmacy) (e-Journal) 4, no. 2 (October 20, 2018): 98–105. http://dx.doi.org/10.22487/j24428744.2018.v4.i2.10440.

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Green Synthesis is a method to make silver nanoparticles (AgNPs) by utilizing natural materials as bioreductors. One of the natural materials that can reduce metal ions is Kaempferia galanga rhizome because it has a chemical component that can penetrate the metal. The compounds are ethyl paramethoxycinnamate (EPMC) which is used as sunscreen. This study aims to produce AgNPs conjugated with EPMC that can be used as raw material sunscreen. This study was conducted by extracting EPMS from the Kaempferia galanga rhizome and synthesizing the AgNPs conjugated with EPMC. The synthesis results were characterized by UV-Vis Spectrophotometry, FTIR, SEM, PSA and sunscreen activity. Extracted result was obtained crystalline is ethyl paramethoxycinnamate compound with yield 2,3%. The characterization of EPMC with UV-Vis spectrophotometer was obtained maximum wavelength of 308 nm and FTIR analysis result at wave number 1701,27 cm-1 indicated the presence of carbonyl group (C = O) and 1165,97 cm-1 presence of C-O and showed specific characteristic from EPMS. Characterization of AgNPs using Uv-Vis spectrophotometer was obtained maximum wavelength of 469 nm. Characterization of AgNPs using SEM are spherical and monodispers forms. Then, particle size using PSA obtained an average diameter of 182 nm. AgNPs conjugated with EPMS has a sunscreen activity with sunblock category and successfully provide protection against UV exposure at low concentration (200 ppm) categorized as ultra protection with SPF value 36,4.
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Sun, Li, Fu Tian Liu, Qi Hui Jiang, Xiu Xiu Chen, and Ping Yang. "Monodisperse Fe3O4/Fe Core/Shell Nanoparticles with Enhanced Magnetic Property." Advanced Materials Research 306-307 (August 2011): 410–15. http://dx.doi.org/10.4028/www.scientific.net/amr.306-307.410.

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Core/shell type nanoparticles with an average diameter of 20nm were synthesized by chemical precipitation method. Firstly, Monodisperse Fe3O4 nanoparticles were synthesized by solvethermal method. FeSO4ž7H2O and NaBH4 were respectively dissolved in distilled water, then moderated Fe3O4 particles and surfactant(PVP) were ultrasonic dispersed into the FeSO4ž7H2O solution. The resulting solution was stirred 2 h at room temperature. Fe could be deposited on the surface of monodispersed Fe3O4 nanoparticles to form core-shell particles. The particles were characterized by using various experimental techniques, such as transmission electron microscopy (TEM), X-ray diffraction (XRD), AGM and DTA. The results suggest that the saturation magnetization of the nanocomposites is 100 emu/g. The composition of the samples show monodisperse and the sides of the core/shell nanoparticles are 20-30nm. It is noted that the formation of Fe3O4/Fe nanocomposites magnetite nanoparticles possess superparamagnetic property.
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Kim, Jong Ung, Jeong A. Lee, Beyong Hwan Ryu, Ki Won Jun, In Ho Kim, and Young Min Choi. "Synthesis and Characterization of PbSe Nanocrystals by a Microchannel Reactor." Solid State Phenomena 124-126 (June 2007): 1285–88. http://dx.doi.org/10.4028/www.scientific.net/ssp.124-126.1285.

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The synthesis of high-quality monodispersed nanocrystal is very important. Typical synthetic method is rapid nucleation by injection of an organometallic precursor into a solvent maintaining the reaction temperature. Since these methods are discontinuous processes, they are not efficient for large-scale production of monodisperse nanocrystals. In this study, continuous microchannel reaction technique is presented for synthesis of monodisperse lead selenide nanocrystals in a diphenyl ether as high-temperature organic media. The microchannel reactor was used due to its possibility of continuous process and reproducibility of narrow size distribution in nanocrystal synthesis. The synthesis was carried out in microchannel reactor (800 μm diameter) made from PTFE. Lead oleate and TOP-Se were used as organic precursor and diphenyl ether as high-temperature organic solvents. Lead selenide particles with a size of less than 10nm could be continuously prepared by this method. The nanocrystals have been characterized by X-ray diffraction, TEM and optical absorption spectrometer.
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Aghababazadeh, R., S. Tabatabae, Ali Shokuhfar, and A. R. Mirhabibi. "Synthesis and Characterization of Silica Nanoparticles." Solid State Phenomena 121-123 (March 2007): 49–52. http://dx.doi.org/10.4028/www.scientific.net/ssp.121-123.49.

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Currently there are several models discussed to describe the formation of monodispersed silica particles. Monodisperse colloidal silica was prepared from tetraethoxysilane in mixture of ammonia, water and ethanol. Chemical system reaction permits the controlled growth of silica nanoparticles and subsequent condition of silicic acid in alcoholic solution. The molar ratio of NH4OH, C2H5OH and H2O has a significant effect on particle size and specific surface area of silica particles. The nature of particles was evaluated using X-ray diffraction, energy dispersive spectroscopy (EDS) and BET. The morphology of particles were determined by scanning electron microscopy (SEM) and transmission electron microscopy(TEM).
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CHOI, HYOUNG J., YUN H. CHO, MIN S. CHO, and MYUNG S. JHON. "ELECTRORHEOLOGY OF POLYANILINE-COATED POLY(METHYLMETHACRYLATE) MICROSPHERE SUSPENSIONS IN SILICONE OIL." International Journal of Modern Physics B 16, no. 17n18 (July 20, 2002): 2507–13. http://dx.doi.org/10.1142/s021797920201258x.

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Electrorheological (ER) suspensions containing spherical-monodispersed polymer particles in silicone oil were investigated. The core was poly(methylmethacrylate) (PMMA), obtained by dispersion polymerization method, and the shell, coated on monodisperse PMMA particles, was polyaniline(PA) prepared by in-situ polymerization of aniline in aqueous acidic medium. Both steady shear and dynamic tests were conducted under various electric field strength and particle concentrations in order to study flow and viscoelastic properties of the PAPMMA based ER fluids. Dielectric spectra of the ER fluids obtained were found to given a clue both to analyze their electrical polarization properties and to interpret flow behavior of the PAPMMA ER fluids.
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Watcharenwong, Apichon, Yotsapon Bailuang, and Puangrat Kajitvichyanukul. "Synthesis and Characterization of Monodisperse Magnetite Nanoparticles by Hydrothermal Method." Key Engineering Materials 737 (June 2017): 367–72. http://dx.doi.org/10.4028/www.scientific.net/kem.737.367.

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Monodisperse nanoparticles are materials that are not agglomerate. The good characteristic of these materials is the dispersity in water, so they can better react with target pollutants. Accordingly, in this work, the monodisperse magnetite nanoparticles with the superparamagnetic property were synthesized and characterized. The hydrothermal method with the iron compound and polymer as precursors was conducted. The magnetic nanoparticles were characterized by several techniques including X-ray diffraction, field emission scanning electron microscope, transmission electron microscope, and vibrating sample magnetometer. The saturation magnetization (Ms) value, the coercivity (Hc), and the retentivity (Mr) were measured to demonstrate the paramagnetic behavior of the monodisperse magnetite nanoparticles. The results showed that the Fe3O4 nanoparticle were obtained at 200 °C for 16 h. The particles are monodispersed with the size approximately in the range of 60 - 250 nm as confirmed by FE-SEM and TEM images. These are the single grain and had the spherical shape similar to a blackberry. The saturation magnetization of 17.287 emu/g and ratio of retentivity to saturation magnetization (Mr/Ms) characterized the squareness of the hysteresis loops was 0.03653. It can be indicated that the Fe3O4 nanoparticles had superparamagnetic behavior. This property of Fe3O4 nanoparticles can draw pollutants to absorb on the surface of these nanomaterials. Then adsorbed pollutants can be easily removed by separating the Fe3O4 materials from water. This technique can be applied further in water treatment and pollutant removal.
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Dissertations / Theses on the topic "Monodispers"

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Hartmann, Laura. "Synthese monodisperser, multifunktionaler Poly(amidoamine) und ihre Anwendung als nicht-virale Vektoren für die Gentherapie." Phd thesis, Universität Potsdam, 2007. http://opus.kobv.de/ubp/volltexte/2007/1312/.

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Die vorliegende Arbeit beschäftigt sich mit der Synthese monodisperser, multifunktionaler Poly(amidoamine) (PAAs). Die Klasse der PAAs ist besonders interessant für eine Anwendung im Bereich der Biomedizin, da sie meist nicht toxisch ist, eine sehr geringe Immunogenizität zeigt und eine erhöhte Zellmembranpermeabilität besitzt. Allerdings ist der Einsatz linearer PAAs bisher limitiert, da ihre Synthese nur den Zugang von hoch-polydispersen Systemen mit einer streng alternierenden oder statistischen Verteilung von Funktionalitäten erlaubt. Es ist daher von großem Interesse diese Polymerklasse durch die Möglichkeit eines sequenzdefinierten Aufbaus und der Integration von neuen Funktionalitäten zu verbessern. Um dies zu ermöglichen, wurden, vergleichbar mit der etablierten Festphasensynthese von Peptiden, schrittweise funktionale Disäure- und Diamin-Bausteine an ein polymeres Träger-Harz addiert. Der sequenzielle Aufbau ermöglicht die Synthese monodisperser PAAs und die Kontrolle über die Monomersequenz. Die Wahl der Monomer-Bausteine und ihrer Funktionalitäten kann dabei für jede Addition neu getroffen werden und entscheidet so über die Sequenz der Funktionalitäten im Polymerrückgrat. Die verwendete Chemie entspricht dabei der Standardpeptidchemie, so dass mit Hilfe eines Peptidsynthese-Automaten die Synthese vollständig automatisiert werden konnte. Die Verwendung spezieller Trägerharze, die bereits mit einem synthetischen Polymerblock wie PEO oder auch mit einem Peptid vorbeladen waren, erlaubt die direkte Synthese von PEO- und Peptid-PAA Blockcopolymeren. Da die hier dargestellten PAAs später auf ihre Eignung als multivalente Polykationen in der Gentherapie getestet werden sollten, wurden zunächst Bausteine gewählt, die den Einbau verschiedener Aminfunktionalitäten ermöglichen. Die Bausteine müssen dabei so gewählt sein, dass sie kompatibel sind mit der Chemie des Peptidsynthesizers und eine quantitative Addition ohne Neben- oder Abbruchreaktionen garantieren. Darüber hinaus ist der Einbau von Peptidsequenzen und Disulfid-Einheiten in die PAA-Kette möglich, die z. B. für einen selektiven Abbau des Polymers im Organismus genutzt werden können. Zusammenfassend lässt sich feststellen, dass die in dieser Arbeit vorgestellten PAA-Systeme großes Potenzial als nicht-virale Vektoren für die Gentransfektion bieten. Sie sind nicht toxisch und zeigen Zellaufnahme-Effizienzen von bis zu 77%. Die Gentransfereffizienz ist im Vergleich zu etablierten Polymer-Vektoren zwar noch sehr gering, aber die bisherigen Versuche zeigen bereits eine mögliche Ursache, nämlich die schlechte Freisetzung des Genmaterials innerhalb der Zelle. Eine Lösung dieses Problems bietet jedoch die weitere Modifizierung der PAA-Systeme durch den Einbau von Sollbruchstellen. Diese Sollbruchstellen ermöglichen einen programmierten Abbau des Polymers innerhalb der Zelle und damit sollte die Freisetzung des Genmaterials vom Träger deutlich erleichtert werden. Mögliche Bruchstellen sind z. B. enzymatisch gezielt spaltbare Peptideinheiten oder Disulfid-Einheiten, wie sie bereits als Bausteine für die PAA-Synthese vorgestellt wurden (vergl. Kapitel 4.4). Da nur innerhalb der Zelle ein reduzierendes elektrochemisches Potential besteht, werden z. B. Disulfid-Einheiten auch nur dort gespalten und bieten außerhalb der Zelle ausreichende Stabilität zum Erhalt der Polyplexstruktur. Neben einer Anwendung in der Gentherapie bieten die hier vorgestellten PAA-Systeme den Vorteil einer systematischen Untersuchung von Struktur-Eigenschafts-Beziehungen der Polyplexe. Es wurden verschiedene Zusammenhänge zwischen der chemischen Struktur der PAA-Segmente und der Art und Stärke der DNS-Komprimierung aufgezeigt. Die Komprimierungsstärke wiederum zeigte deutlichen Einfluss auf die Internalisierungsrate und damit auch Transfektionseffizienz. Darüber hinaus zeigte sich ein drastischer Einfluss des PEO-Blocks auf die Stabilisierung der Polyplexe sowie deren intrazelluläre Freisetzung bei Zusatz von Chloroquin. Dennoch bleiben aufgrund der Komplexität der Zusammenhänge noch viele Mechanismen der Transfektion unverstanden, und es muss Aufgabe folgender Arbeiten sein, das Potential der hier eingeführten monodispersen PAA-Systeme weiter auszuloten. So wäre z. B. eine Korrelation der Kettenlänge mit den Parametern der Polyplexbildung, der Zellaufnahme und Transfektionseffizienz von großem Interesse. Darüber hinaus bietet der Einbau von Sollbruchstellen wie kurzen Peptidsequenzen oder den hier bereits eingeführten Disulfid-Einheiten neue Möglichkeiten der gezielten Freisetzung und des programmierten Abbaus, die näher untersucht werden müssen. Neben der Anwendung im Bereich der Gentransfektion sind außerdem andere Gebiete für den Einsatz von monodispersen multifunktionalen PAAs denkbar, da diese kontrollierbare und einstellbare Wechselwirkungen ermöglichen.
Recently, linear poly(amidoamine)s (PAAs) have received considerable attention due to their excellent biocompatibility and ease of synthesis.[1] PAAs are multifunctional polymers, which often exhibit low inherent immunogenicity and reduced cyto- as well as hemotoxicity in contrast to established, cationic polymers such as poly(ethylene imines) (PEI) or poly(L-lysines) (PLL).[2] This makes PAAs highly suitable for biomedical and pharmacological applications in the fields of drug and gene delivery.[1,2] However, the full potential of these polymers cannot be accessed since the synthesis proceeds via an uncontrolled polyaddition reaction leading to ill-defined products with Mw/Mn ≥ 2. This does not only make rational design of polymer properties and the precise positioning of functionalities along the polymer backbone difficult, furthermore product registration becomes complicated because legislation requires increasingly more defined products. Here we present a novel synthesis route towards multifunctional, sequence-defined polyamides.[3] A fully automated, solid-phase polymer synthesis was developed and utilized to obtain linear PAA segments. These exhibit no molecular weight or chemical distributions due to their monodispersity (Mw/Mn = 1) and their controlled monomer sequence. The compatibility of the PAA-synthesis with the standard Fmoc/tBu solid-phase supported peptide synthesis has been preserved, making this route a versatile approach to peptide-PAA (Pep-PAA) and poly(ethylene oxide)-PAA (PEO-PAA) conjugates. Several Pep-PAA and PEO-PAA conjugates were synthesized, exhibiting PAA segments with different cationic functionalities. These conjugates were analyzed concerning their cytotoxicity showing very promising results. Additionally their potential to complex plasmid-DNA and to form so-called polyplexes for non-viral gene delivery was tested. A strong relationship between the monomer sequence and the polyplex structure was observed, depending on the balance and total amount of tertiary, secondary and primary amine functionalities within the PAA-segment. Moreover the monomer sequence has a strong influence on the biological properties such as the cell-internalization of polyplexes as well as the transfection activity. This clear correlation between the chemical assembly and the resulting biological properties may help to further the understanding of the mechanisms of gene delivery by polymeric carriers and hence to promote the rational design of better suited systems. Even if the transfection activity for the PAA-polpylexes might still be not comparable to the established “gold standard” PEI, their low level of toxicity and the possibility to improve the system by adjusting the monomer sequence shows great potential as carrier systems in drug or gene delivery.
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Leclaire, Thomas. "Entwicklung eines Verfahrens zur Erzeugung monodisperser Partikel mit definierter elektrischer Ladung / Development of a method for generating monodisperse particles having a predefined electrical charge." Gerhard-Mercator-Universitaet Duisburg, 2005. http://www.ub.uni-duisburg.de/ETD-db/theses/available/duett-11082005-180328/.

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Theoretical models describing the kinetic and evaporation as well as the electrical charge of droplets in a droplet chain generated by a vibrating orifice generator are presented. The models are verified by experimental results. Droplet charge and the electrical current transported by the droplet chain are correlated with the length of the liquid jet. Based on these results, an apparatus for generating neutral or predefined charged particles has been developed, whereby not only the average charge of the particle collective, but also the charge of individual droplets can be defined. The applicability in generating solid particle aerosols by jet dispersion of solutions are disclosed.
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Josephides, Dimitris Noel. "Optimising monodisperse emulsion creation." Thesis, King's College London (University of London), 2015. http://kclpure.kcl.ac.uk/portal/en/theses/optimising-monodisperse-emulsion-creation(399fe892-a5e6-4dab-941a-457e620d651f).html.

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Monodisperse emulsions are a special class of emulsion where all droplets are of uniform size. The properties of emulsions (rheology, appearance, stability, reaction kinetics) are determined by the properties of both continuous and dispersed phases but also by the characteristics of the droplets themselves. It is for this reason that monodisperse emulsions are often sought after, as droplet size can have such a large influence upon emulsion behaviour. Having a uniform emulsion results in more predictability and allows for easier design in emulsion properties. Monodisperse emulsions find uses in many academic and industrial fields including pharmaceuticals, food science, paints, and coatings. This work covers two broad approaches to monodisperse emulsion creation; microfluidics and controlled shear. Microfluidics is a rapidly emerging technology where liquid flows are constrained to sub-millimetre channel sizes thus creating highly laminar and controllable flows. The methods are used in various lab on chip, and droplet creating applications. A study is undertaken on the nature of buoyancy-driven formation of drops from microchannels, attempting to further understand the fundamental principles of monodisperse drop generation at nozzles. Droplet producing microfluidic devices often suffer, however, from jetting when the desired emulsions are viscous or have low interfacial tensions, resulting in polydispersity. This work introduces two methods to overcome this, surfactant shielding and core-shell templating. Surfactant shielding is a method by which the nozzle of a droplet producing capillary tip is protected from surfactants by a tertiary, pure continuous phase thus limiting the reduction of interfacial tension at the point of droplet creation. Core-shell templating is a method of introducing water droplets into the stream of a would-be jetting system. These water droplets introduce regular instabilities which have the effect of forcing the system into a quasi-dripping regime and thus create highly monodisperse viscous emulsions. Controlled shear is another method for creating monodisperse emulsions whereby a coarse emulsion is subjected to a uniform shear stress resulting in a smaller more monodisperse emulsion. The work investigates two geometries for doing this, a cylinder-curved plate and a cylinder-flat plate. Both these designs are shown to have higher throughput rates than conventional shear methods. In the final part of this work, microfluidics and controlled shear are combined in an attempt to utilise the contrasting benefits found in both techniques. A study is undertaken in the possibility of shearing monodisperse precursor emulsions created via microfluidic techniques, to obtain uniform emulsions of much smaller size. A microfluidic shear cell is also introduced which aims to combine the benefits of a shear device (increased throughput rates, ability to handle viscous fluids) with the benefits of microfluidics (no moving parts, more control).
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Wilber, Alex W. "Simulation studies of monodisperse self-assembly." Thesis, University of Oxford, 2009. http://ora.ox.ac.uk/objects/uuid:4bea99a3-5d17-4233-8065-879183ef0a32.

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The processes by which anisotropic colloidal and nanoscale particles may come together to form ordered monodisperse structures are not well understood. The canonical example of such a system is provided by the assembly of virus capsids, in which tens to thousands of particles of one or a few types assemble efficiently into ordered, highly symmetrical shells. Other examples include a wide variety of protein oligomers, and there is interest in producing analogous systems of synthetic particles. In this thesis I study the self-assembly of simple model particles, consisting of spheres decorated with attractive patches. I consider in detail the assembly of clusters of particles corresponding to the Platonic solids. For the majority of these structures assembly is found to be efficient over a wide range of parameter space. The optimal conditions represent a compromise between thermodynamic stability and kinetic accessibility. We consider two versions of the model, with and without constraints on the torsion angle of bound particles. In both cases the structures with triangular faces are found to assemble most easily. In the absence of torsional constraints dodecahedra will not assemble under any set of parameters as a result of the preferential formation of disordered aggregates. With torsional constraints included all of the Platonic solids assemble successfully and the behaviour of the model is considerably changed. In particular disordered aggregates become far less favourable. I explore possible methods of assembling larger structures, either via “hierarchical” assembly where small clusters are first assembled and then used as building blocks in another stage of assembly, or by a templating method in which an inner cluster acts as a template for a larger outer cluster. These approaches are studied using the “Virtual Move Monte Carlo” cluster move algorithm, the behaviour of which we examine in some detail.
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Shevchenko, Elena V. "Monodisperse magnetic alloy nanocrystals and their superstructures." [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=968507395.

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Duan, Hongxu. "Generation and printing of strictly monodisperse droplets." Master's thesis, University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5931.

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Highly monodisperse droplets are attracting great attention both in many research areas, such as aerosol science, combustion, and Nano-manufacturing. This thesis invents a novel aerosol generator: “Periodic Electro Hydro-dynamic Chopper” termed as “PEHD chopper”, and develops a new method to directly print micro-patterns with monodisperse droplets. The principle of the PEHD chopper is to use the fringe electric field of a capacitor to introduce controlled perturbation on a liquid jet. We first derived the governing equations for a circular inviscid liquid jet under transverse electric fields. The electric fields were obtained through numerical simulation. Then we used a high speed camera (up to one million frames per second) to visualize the jet break-up as well as the droplets' size and shape. The experiments show that the PEHD chopper can effectively “chop” a neutral micro-jet and generate highly monodisperse micro-droplets, which diameter range from 100 &"181;m to 500 &"181;m. To reduce the droplet size, PEHD chopper with a butterfly design is applied on a typical single electrospray. In this configuration, the jet swings at long wavelengths (?>?R), where ?R is the Rayleigh wave length, but breaks up into highly monodisperse droplets near 2?R and ?R without satellite droplets. The butterfly configuration combined with electrified jet expands the diameter range into 20 &"181;m to 100 &"181;m. Finally, we demonstrate the electrospray printing of Polymer Derived Ceramics (PDC) for sensor applications in harsh environment. A modified single ES with an additional driving electric field is used to directly print PDC precursor without mask, we achieved 1D feature as narrow as 35 &"181;m and a micro pentagram pattern. Moreover, after pyrolysis of PDC at 1100 °C in nitrogen, amorphous alloys of silicon, carbon and nitrogen (SiCN) are obtained. The samples exhibit excellent good integrity and adhesion to the substrate.
M.S.M.E.
Masters
Mechanical and Aerospace Engineering
Engineering and Computer Science
Mechanical Engineering; Miniature Engineering Systems
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Japuntich, Daniel A. "Clogging of fibrous filters with monodisperse aerosols." Thesis, Loughborough University, 1991. https://dspace.lboro.ac.uk/2134/7132.

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The clogging of fibrous air filters by solid aerosol particles in the inertial interception capture range was experimentally and theoretically investigated. Flat filters were loaded to particle filter cake formation at 0.10 m/s filter face velocity with monodisperse aerosols. An evaporator-condenser aerosol generator capable of producing a stable 0.6 kg/hr product of monodisperse, solid aerosols in the range 1 to 5 micrometers aerodynamic diameter was designed, fabricated, and optimized. The output aerosol was introduced into a vertical challenge duct, where the mass concentrations upstream and downstream of the filter sample, and thus the filter penetration, were measured using continuous flow sampling through two light scattering photometers. Simultaneous measurements were made of the filter flow resistance during the particle loading process. A discussion of the possible definitions of clogging is given from descriptions of the plots of the experimental filtration responses with mass challenge. The relationship between the clogging point and effective filter pore diameter for different aerosol challenges is given for medium efficiency fibreglass papers and for filters made with 15.5 micrometer diameter monodisperse fibres.
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Moraes, Daniel Angeli de. "Nanopartículas com propriedades plasmônicas: otimização de parâmetros de síntese visando sistemas monodispersos, controle morfológico, estrutural e de composição química, funcionalização de superfície e avaliação de estabilidade coloidal." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/75/75134/tde-20042017-102736/.

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Nanopartículas (NPs) que apresentam ressonância plasmon de superfície localizada (RPSL) são aplicáveis em diversas áreas como, por exemplo, em terapia e diagnóstico na área biomédica. Estudos e aplicações in vivo requerem que a banda plasmon (BP) ocorra na mesma região da janela terapêutica, entre 600 e 1000 nm. Esta condição pode ser atingida com a modulação da BP pelo controle da morfologia e da composição química das NPs. Os objetivos principais deste trabalho foram estudar métodos de síntese que permitissem obter maiores quantidades de materiais quando comparados aos métodos convencionais em meio aquoso, e conjuntamente avaliar os parâmetros de síntese para obter NPs com diferentes morfologias e composições almejando modular a BP para região de interesse. Obteve-se nanoesferas (NEs) de Au monodispersas com diâmetro médio de 9 nm por redução com oleilamina em solução concentrada de sais de ouro. Dispersibilidade em água com elevada estabilidade coloidal foi alcançada via um procedimento de troca de ligantes, substituindo as moléculas de oleilamina, presentes na superfície das NPs assim como sintetizadas, por moléculas de ácido 11-mecaptoundecanóico. Nanobastões (NBs) de Au (largura de 12 nm) com diferentes comprimentos (30-300 nm) foram obtidos em misturas incomuns das fases cristalinas fcc e hcp. Estes NBs apresentam duas BP no espectro UV-Vis-NIR, uma em 520 nm e outra banda alargada a partir de 800 nm atribuídas à RPSL transversal e longitudinal, respectivamente. Inicialmente, os NBs foram sintetizados utilizando oleilamina como agente redutor e surfactante, sendo posteriormente avaliado que a presença de álcool oleico ou trietilamina no meio mantiveram uma condição de crescimento-1D mantendo a forma dos nanomateriais. NEs de Ag foram obtidas em condições semelhantes às NEs de Au com a BP em torno de 420 nm. Obteve-se misturas de NEs e NBs de AuCu3 (NBs, com razão de aspecto de 3) em todas as condições estudadas, sendo posteriormente separadas. Duas BP foram observadas para os NBs de AuCu3 em 560 e 766 nm, atribuídas à ressonância transversal e longitudinal, respectivamente. NPs monodispersas de Cu1,8S com 10 nm e BP centradas em 1150 nm foram sintetizadas por injeção a quente. Uma tentativa de recobrimento com Au das NPs de Cu1,8S resultou em uma reação de substituição, formando NPs de Au2S, a qual não apresentou BP. Investigou-se sínteses de NPs Cu1,8S dopado com M (M = Fe, Al e Zn) e alguns resultados foram: i) todas amostras foram obtidas na fase digenita e com baixa dispersão de tamanho; ii) Al e Fe incorporaram na estrutura cristalina, mas aparentemente o Zn não incorporou; iii) a BP foi deslocada para maiores comprimentos de ondas em todas amostras. Em resumo, obteve-se NPs com BP na região de interesse, em quantidades maiores que as sínteses convencionais. Este trabalho contribui para a compreensão da ação de reagentes/condições experimentais sobre a composição e o controle morfológico das NPs (principalmente crescimento-1D). Ressalta-se, entre os estudos, a formação de NBs de Au na fase hcp, possibilitando futuros estudos de propriedades; o redshift da BP das NPs de Cu1,8S dopados que não eram esperados, sendo um resultado instigante para futuros estudos; e a efetiva modificação de superfície das NPs de Au que resultou em elevada estabilidade coloidal na faixa de pH entre 6 e 10, possibilitando futuras aplicações.
Nanoparticles (NPs) that present localized surface plasmon resonance (LSPR) enables several applications, for example, therapy and diagnosis in the biomedical area. In vivo studies and applications require that plasmon band occurs in the same region of the therapeutic window, between 600 and 1000 nm. This condition can be achieved with the plasmon band (PB) modulation by morphological and chemical composition control of the NPs. The main purpose of this work concerning to evaluate of the syntheses parameters to obtain NPs with different morphologies and compositions by using experimental procedures, which to enable reach larger NPs amounts than the conventional aqueous medium methods. Monodisperse Au nanospheres (NSs) with average diameter of 9 nm were obtained by reduction of gold salts in concentrated solutions by oleylamine. As-synthesized Au-NSs present oleylamine molecules onto the surface that it was replaced by 11-mercaptoundecanoic acid by using a ligand exchange procedure, resulting in the water-dispersible system with high colloidal stability. Au nanorods (NRs, 12 nm-width) with different lengths (30-300 nm) were synthesized. These NRs are an expressive result, because its present an unusual fcc and hcp crystalline phases mixtures. There is only one paper in the literature that reports the direct synthesis of Au-hcp nanostructure. The NRs dispersion show two PB in the UV-Vis-NIR spectrum at 520 nm and another large band starting in 800 nm attributed to transversal and longitudinal LSPR, respectively. Initially, the NRs were synthetized by using oleylamine as reducing agent and surfactant, and NPs with same shape were obtained in presence of oleyl alcohol or triethylamine as surfactant in the medium. Ag NSs were obtained in similar conditions of Au NSs with shape control, and LSPR band in 420 nm. Mixtures of NSs and NRs (aspect ratio of 3) of AuCu3 were obtained for all studied conditions, and separated by using a selective separation process. Two PB were observed for AuCu3 NRs at 560 and 766 nm, assigned to transversal and longitudinal resonance, respectively. Monodisperse Cu1,8S semiconductor NSs with 10 nm and PB centered in 1150 nm were synthetized via hot-injection, and attempts to cover them with Au resulted in a substitution reaction that lead the formation of Au2S NPs, which did not present PB. Syntheses of M-doped Cu1,8S NPs (M = Fe, Al e Zn) were investigated and some results were: i) all samples are digenite phase and presented low dispersivity of size; ii) Al and Fe were incorporate more effective into the crystal structure than Zn; iii) were observed redshift of PB for all samples. In summary, NPs with PB in the region of interest were obtained in greater amounts than the conventional syntheses. This thesis presents contributions to the understanding of experimental parameters that act on the compositional and morphological control of NPs (mainly 1D growth). It is emphasized among the studies: the formation of Au NRs in the hcp phase, enabling future studies of properties; the PB redshift of the doped Cu1,8S NPs that were not expected, however, this is a stimulating result for future studies; and an effective surface modification of the Au NPs that result in high colloidal stability in the pH range between 6 and 10, allowing for future applications.
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Ekart, Susan LaSota. "The impaction of monodisperse aerosols on louver collectors." Thesis, Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/10936.

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Erbacher, Christoph. "Monodisperse, kompakte Siliciumdioxid-Mikrosphären : Synthese, Charakterisierung und Packungseigenschaften /." [S.l.] : [s.n.], 1994. http://library.epfl.ch/theses/?nr=1222.

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Books on the topic "Monodispers"

1

French, J. Barry. Monodisperse dried microparticulate injector for analytical instrumentation. [S.l.]: American Chemical Society, 1994.

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French, J. B. Monodisperse dried microparticulate injector for analytical instrumentation. [S.l.]: [s.n.], 1994.

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Andrieux, Sébastien. Monodisperse Highly Ordered and Polydisperse Biobased Solid Foams. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-27832-8.

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Agrawal, S. K. Representation of the vaporization behavior of turbulent polydisperse sprays by "equivalent" monodisperse sprays. [Washington, DC]: National Aeronautics and Space Administration, 1987.

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Thom, R. The certification of monodisperse latex spheres in aqueous suspensions with nominal diameter2.0 [mu]m, 4.8 [mu]m and 9.6 [mu]m (RM 165, 166 and 167). Luxembourg: Commission of the European Communities Directorate-General Information Market and Innovation, 1985.

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Monodispersed Particles. Elsevier, 2001. http://dx.doi.org/10.1016/b978-0-444-89569-1.x5016-7.

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Monodispersed Particles. Elsevier, 2019. http://dx.doi.org/10.1016/c2012-0-02740-8.

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P, Cernansky N., Namer I, Lewis Research Center, Drexel University, and Drexel University. Dept. of Mechanical Engineering & Mechanics, eds. Spark ignition of monodisperse fuel sprays. Philadelphia, PA: Dept. of Mechanical Engineering and Mechanics, Drexel University, 1987.

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Japuntich, Daniel A. Clogging of fibrous filters with monodisperse aerosols. 1991.

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Andrieux, Sébastien. Monodisperse Highly Ordered and Polydisperse Biobased Solid Foams. Springer, 2019.

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Book chapters on the topic "Monodispers"

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Gooch, Jan W. "Monodisperse." In Encyclopedic Dictionary of Polymers, 473. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_7680.

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Torquato, Salvatore. "Monodisperse Spheres." In Interdisciplinary Applied Mathematics, 119–59. New York, NY: Springer New York, 2002. http://dx.doi.org/10.1007/978-1-4757-6355-3_5.

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Groll, Rodion. "Diffusion monodisperser Zweiphasenströmungen." In Diffusionsmodellierung, 185–257. Wiesbaden: Springer Fachmedien Wiesbaden, 2015. http://dx.doi.org/10.1007/978-3-658-11342-1_4.

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Andrieux, Sébastien. "Monodisperse Highly Ordered Nanocomposite Foams." In Springer Theses, 91–103. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-27832-8_5.

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Funk, James E., and Dennis R. Dinger. "Fundamentals of Particle Packing, Monodisperse Spheres." In Predictive Process Control of Crowded Particulate Suspensions, 59–73. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4615-3118-0_5.

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Spasova, M., and M. Farle. "Magnetism of Monodisperse Core/Shell Particles." In Low-Dimensional Systems: Theory, Preparation, and Some Applications, 173–92. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-010-0143-4_15.

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Bartlett, Jeffrey S., Richard J. Samulski, Yuhua Li, and Edward T. Samulski. "Genetically Expressed Monodisperse α Helical Polypeptides." In New Macromolecular Architecture and Functions, 159–69. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/978-3-642-80289-8_17.

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Ugelstad, J., A. Berge, T. Ellingsen, J. Bjorgum, R. Schmid, P. Stenstad, O. Aune, T. N. Nilsen, S. Funderud, and K. Nustad. "Biomedical Applications of Monodisperse Magnetic Polymer Particles." In Future Directions in Polymer Colloids, 355–70. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3685-0_22.

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Andrieux, Sébastien. "Monodisperse and Polydisperse Chitosan Foams via Microfluidics." In Springer Theses, 67–90. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-27832-8_4.

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Hovhannisyan, A. A., G. K. Grigoryan, A. G. Nadaryan, and N. H. Grigoryan. "Possibilities of Synthesis of Monodispersed Latex." In Advanced Materials, Polymers, and Composites, 153–61. New York: Apple Academic Press, 2021. http://dx.doi.org/10.1201/9781003105015-11.

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Conference papers on the topic "Monodispers"

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Tropmann, A., N. Lass, N. Paust, C. Ziegler, R. Zengerle, and P. Koltay. "Monodisperse microparticle generation from aqueous solutions." In TRANSDUCERS 2011 - 2011 16th International Solid-State Sensors, Actuators and Microsystems Conference. IEEE, 2011. http://dx.doi.org/10.1109/transducers.2011.5969626.

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Xiaoxiao Zhang, Aaron T. Ohta, and David Garmire. "Rapid monodisperse microencapsulation of single cells." In 2010 32nd Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC 2010). IEEE, 2010. http://dx.doi.org/10.1109/iembs.2010.5627084.

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Trajkovska, Anita, Chunki Kim, Jason U. Wallace, and Shaw H. Chen. "Photoalignment of monodisperse glassy-nematic oligofluorenes." In Photonic Devices + Applications, edited by Iam Choon Khoo. SPIE, 2007. http://dx.doi.org/10.1117/12.734852.

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Tsai, S. C., R. W. Mao, D. Mukai, S. K. Lin, J. Y. Yang, N. Wang, A. F. Wilson, et al. "Pulmonary Delivery of Isoproterenol Aerosol Generated With Silicon-Based MHz Ultrasonic Nozzles." In ASME 2009 4th Frontiers in Biomedical Devices Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/biomed2009-83035.

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Monodisperse micron-sized aerosol is ideal for pulmonary drug delivery. This paper reports delivery of monodisperse aerosol of medicinal droplets generated by MHz ultrasonic nozzles using an anatomically realistic upper airway model. The MHz ultrasonic nozzle is fabricated using MEMS technology, and comprised of a piezoelectric drive section and a silicon resonator of multiple Fourier horns (see Fig. 1) [1]. The dissolved medication is pumped into a central channel (200×200 μm2) inside the nozzle and exits at the nozzle tip that vibrates longitudinally at the nozzle resonant frequency. The novel design of multiple horns facilitates generation of a column of monodisperse droplets at electric drive power as low as 15mW [1]. Monodisperse ethanol droplets 2.4 μm and water droplets 4.5 μm in diameter have been produced, respectively, using 1.5 MHz and 1.0 MHz nozzles. We used an aqueous solution of 25mg/ml (2.5wt%) β2-agonist (isoproterenol) for generation of monodisperse droplets using the 1.0 MHz ultrasonic nozzles. A yield of >54% (to the lower airways on total amount of inhaled isoproterenol basis), significantly higher than the reported highest lower airways deposition (32%) using metered-dose-inhalers (MDIs) [2], has been accomplished.
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STEINMACHER, F. R., A. MUSYANOVYCH, K. LANDFESTER, C. SAYER, and P. H. H. ARAUJO. "MONODISPERSE MICROPARTICLES OBTAINED USING SPG MEMBRANE TECHNIQUE." In XX Congresso Brasileiro de Engenharia Química. São Paulo: Editora Edgard Blücher, 2015. http://dx.doi.org/10.5151/chemeng-cobeq2014-0268-26261-162431.

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Allen, Robert D., K. Rex Chen, and Paula M. Gallagher-Wetmore. "Performance properties of near-monodisperse novolak resins." In SPIE's 1995 Symposium on Microlithography, edited by Robert D. Allen. SPIE, 1995. http://dx.doi.org/10.1117/12.210346.

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Jaskulski, Maciej, Thi Thu Hang Tran, and Evangelos Tsotsas. "CFD model-supported design of monodisperse co-current spray dryers." In 21st International Drying Symposium. Valencia: Universitat Politècnica València, 2018. http://dx.doi.org/10.4995/ids2018.2018.7274.

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In this study the operation of spray drying chambers fitted by the multi-stream monodisperse atomizer was simulated by the previously developed CFD model of skim milk spray drying. A series of CFD simulations of skim milk monodisperse spray drying were performed. The influence of different nozzle positions, initial droplet diameters (180 μm and 167 μm) and the way of air introduction (vertical or swirling with 30° or 60° angle) on the drying process were checked. Parameters like drying air and particle residence time, wall deposition, inter-particle collisions, protein thermal deactivation, air velocity and temperature profiles were compared for each case. Keywords: CFD, spray drying, skim milk, monodisperse atomizers, optimization.
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Wenli Pei, S. Kakibe, I. Ohta, and M. Takahashi. "Controlled monodisperse Fe nanoparticles synthesized by chemical method." In INTERMAG Asia 2005: Digest of the IEEE International Magnetics Conference. IEEE, 2005. http://dx.doi.org/10.1109/intmag.2005.1463768.

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Wang, Baoguo, David A. Weitz, and Ho Cheung Shum. "Tunable Morphology of Monodisperse Polymer Particles With Microfluidics." In ASME 2011 9th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2011. http://dx.doi.org/10.1115/icnmm2011-58119.

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In this work, we propose a novel method to fabricate polymer particles with controlled morphology in microchannel by solidification of polymer solutions and study the transition in the shape of these particles from spheres, to cups, and to donuts. The non-spherical geometries are achieved through nonuniform diffusion of the solvent, leading to non-uniform solidification. By adjusting the flow rates of both continuous and dispersed phases, the spatial heterogeneity in the solvent diffusion rate and thus the morphology of the final polymer particles can be tuned. This approach offers a one-step continuous process for the fabrication of non-spherical polymer particles. The technique is applicable to different polymers under appropriate polymer-solvent combinations. The ability to tune the shapes of polymer particles easily will create new opportunities for applications that require anisotropic functional particles, such as in biomedical engineering.
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Yang, Hongwei, Weiling Luan, and Shan-Tung Tu. "Large-Scale Synthesis of Monodisperse Nanocrystals via Microreaction." In 2007 First International Conference on Integration and Commercialization of Micro and Nanosystems. ASMEDC, 2007. http://dx.doi.org/10.1115/mnc2007-21605.

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A microfluidic reactor was set up to synthesize quantum dots (QDs) in large scale. The increased reaction channels in an individual reactor lead to improved throughput while maintaining sufficient residence time for the nucleation and growth of QDs. Uniform reaction conditions in the four capillaries realized by our set-up result in superior stability of the whole system. Organometallic synthesis of CdSe was chosen as a model system to evaluate the reactor, the absorption spectra of samples collected from different streams at various time intervals are indistinguishable from each other. By systematically varying the reaction parameters, fairly monodisperse CdSe NCs was produced with three times throughput higher than the conventional single-channel counterpart, and the FWHM of the PL. peaks can be controlled in the range from 37nm to 44nm. The large-scale synthesis route is characterized as excellent reproducibility, low-cost, fast reaction, and mass-production, by which 12ml CdSe NCs solution can be produced within 1h with the reaction time of 21s.
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Reports on the topic "Monodispers"

1

Saunders, R. S., J. H. Small, R. R. Lagasse, J. L. Schroeder, and G. M. Jamison. Engineered monodisperse mesoporous materials. Office of Scientific and Technical Information (OSTI), August 1997. http://dx.doi.org/10.2172/527462.

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Salovey, Ronald, and John J. Aklonis. The Behavior of Polymers Filled with Monodisperse Polymeric Beads. Fort Belvoir, VA: Defense Technical Information Center, November 1991. http://dx.doi.org/10.21236/ada242732.

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Grass, Michael Edward. Monodisperse Platinum and Rhodium Nanoparticles as Model Heterogeneous Catalysts. Office of Scientific and Technical Information (OSTI), September 2008. http://dx.doi.org/10.2172/940776.

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Chang, Chong H. Interface area transport of monodispersed spherical particulates. Office of Scientific and Technical Information (OSTI), August 2016. http://dx.doi.org/10.2172/1296695.

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Rader, D., L. Mondy, J. Brockmann, and D. Lucero. Stage response of an Andersen cascade impactor to monodisperse droplets. Office of Scientific and Technical Information (OSTI), May 1989. http://dx.doi.org/10.2172/5882791.

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Gladfelter, Wayne L., David A. Blank, and Kent R. Mann. Monodispersed Zinc Oxide Nanoparticle-Dye Dyads and Triads. Office of Scientific and Technical Information (OSTI), June 2017. http://dx.doi.org/10.2172/1365392.

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Tao, Yong, and Murray E. Moore. Measuring Monodisperse Aerosol Transmission in the Los Alamos Respirable Release Fraction Measurement Chamber. Office of Scientific and Technical Information (OSTI), November 2018. http://dx.doi.org/10.2172/1481115.

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Rioux, Robert M. The Synthesis, Characterization and Catalytic Reaction Studies of Monodisperse Platinum Nanoparticles in Mesoporous Oxide Materials. Office of Scientific and Technical Information (OSTI), January 2006. http://dx.doi.org/10.2172/895528.

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Browner, R. F. Fundamental studies with a monodisperse aerosol-based liquid chromatography/mass spectrometry interface (MAGIC-LC/MS). Office of Scientific and Technical Information (OSTI), October 1990. http://dx.doi.org/10.2172/6179424.

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Browner, R. Fundamental studies with a monodisperse aerosol-based liquid chromatography/mass spectrometry interface (MAGIC-LC/MS). Office of Scientific and Technical Information (OSTI), May 1989. http://dx.doi.org/10.2172/6963245.

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