Relevant bibliographies by topics / Nanoparticle transfer

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Nanoparticle transfer'

Author: Grafiati
Published: 4 June 2021
Last updated: 12 February 2022

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Journal articles on the topic "Nanoparticle transfer"

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Scull, Christopher M., Ruben Kuruvilla, Thomas H. Fischer, and Timothy C. Nichols. "Gene Transfer to Macrophages with Nanoparticle-Loaded Platelets." Blood 106, no. 11 (November 16, 2005): 3043. http://dx.doi.org/10.1182/blood.v106.11.3043.3043.

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Abstract Hemorrhagic fever, traumatic brain injury, and inflammatory bowel syndrome are among a wide range of pathologies involving inflammation that results in bleeding. The vascular injury that occurs in these conditions is closely associated with macrophage activation. An inherent function of macrophages is to phagocytose platelets that have adhered to sites of vascular injury, and thus platelets are an ideal vehicle for site-specific delivery of anti-inflammatory genes to macrophages at wound sites. Here we report the preparation of reporter gene nanoparticle-platelet conjugates and gene transfer to macrophages. Plasmid-containing nanoparticles were prepared by condensing cDNA for β-galactosidase, green fluorescent protein, or luciferase with polyethyleneimine. Scanning electron microscopic analysis showed that this anion/cation agglomeration reaction yields spherical particles with diameters of 100 to 300 nm. Plasmid-containing nanoparticles were then incubated with platelets that were isolated from human blood by differential centrifugation. Flow cytometric and transmission electron microscopic analysis demonstrated that the nanoparticles associated with the surface-connected canalicular system with most platelets containing one or more particles. The ability of the nanoparticle-loaded platelets to transfer the reporter genes to macrophages was tested in tissue culture using monocyte-derived macrophages incubated with the nanoparticle-loaded platelets. Subsequent fluorescent microscopic, luminescent and histological analysis demonstrated that the macrophages readily phagocytosed the nanoparticle-loaded platelets and expressed the reporter genes. This result provides the basis for studies to deliver anti-inflammatory genes to macrophages in animal model systems.
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Jiang, Jia-Zong, Song Zhang, Lei Liu, and Bao-Min Sun. "A microscopic experimental study of nanoparticle motion for the enhancement of oxygen absorption in nanofluids." Nanotechnology Reviews 7, no. 6 (December 19, 2018): 529–39. http://dx.doi.org/10.1515/ntrev-2018-0072.

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AbstractThe behavior of nanoparticle motion has a great influence on gas-liquid mass transfer. However, it has been very difficult to characterize the motion of nanoparticles from a micro view in mass transfer experiments. In this study, a novel method was proposed to investigate nanoparticle Brownian motion through the application of the total internal reflection fluorescence microscope in a self-designed sample (a quasi-static liquid micro-groove) and the mass transfer enhancement of nanoparticles. Nanoparticle movement behavior was photographed using an electron-multiplying charge coupled device, and 100 consecutive images were recorded using Micro-Manager software at a rate of 20 fps. The images were processed through the particle tracking velocimetry algorithm to calculate two-dimensional motion rates of nanoparticles caused by Brownian movement. It showed that nanoparticle loadings influenced the motion rates significantly, and the motion rates were larger with smaller particle sizes under the same operating condition. The mass transfer coefficients in the quasi-static gas-liquid mass transfer system were calculated and analyzed through microscopic measurement. Based on the above thought, three important non-dimensional numbers [Sherwood (Shp), Reynolds (Rep), and Schmidt (Scp) numbers] for mass transfer theory were studied.
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Majeed, Noor Sabeeh, Shaymaa Mahdi Salih, Hussam Nadum Abda Lraheemal Ani, Basma Abbas Abdulmajeed, Paul Constantin Albu, and Gheorghe Nechifor. "Study the Effect of SiO2 Nanofluids on Heat Transfer in Double Pipe Heat Exchanger." Revista de Chimie 71, no. 5 (May 29, 2020): 117–24. http://dx.doi.org/10.37358/rc.20.5.8119.

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In this paper the effect of nanofluid is studied in the double pipe heat exchanger counter current flow, the viscosity of nanofluids are measured at different temperatures and different particle sizes. SiO2 nanoparticles are dispersed at different concentrations (0.2-2) % with different particle sizes of (50-25) nm in base fluid of water. The friction factor and heat transfer coefficient are calculated at different nanoparticle sizes, the results showed that the viscosity was increased as nanoparticle concentration increased. The friction factor is increased as SiO2 nanoparticles concentration and increased as nanoparticles size decreased. The heat transfer coefficient increased as nanoparticle concentration increased and particles size decrease.
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Yacob, Nor Azizah, Anuar Ishak, Roslinda Nazar, and Ioan Pop. "Mixed Convection Flow Adjacent to a Stretching Vertical Sheet in a Nanofluid." Journal of Applied Mathematics 2013 (2013): 1–6. http://dx.doi.org/10.1155/2013/696191.

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The characteristics of fluid flow and heat transfer over a stretching vertical sheet immersed in a nanofluid are investigated numerically in this paper. Three different types of nanoparticles, namely, copper Cu, alumina Al2O3, and titania TiO2, are considered, using water as the base fluid. It is found that nanofluid with titania nanoparticles has better enhancement on the heat transfer rate compared to copper and alumina nanoparticles. For a particular nanoparticle, increasing the nanoparticle fraction is to reduce the skin friction coefficient and the heat transfer rate at the surface.
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Ranjbar, A. A., S. Kashani, S. F. Hosseinizadeh, and M. Ghanbarpour. "Numerical heat transfer studies of a latent heat storage system containing nano-enhanced phase change material." Thermal Science 15, no. 1 (2011): 169–81. http://dx.doi.org/10.2298/tsci100412060r.

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The heat transfer enhancement in the latent heat thermal energy storage system through dispersion of nanoparticle is reported. The resulting nanoparticle-enhanced phase change materials (NEPCM) exhibit enhanced thermal conductivity in comparison to the base material. The effects of nanoparticle volume fraction and some other parameters such as natural convection are studied in terms of solid fraction and the shape of the solid-liquid phase front. It has been found that higher nanoparticle volume fraction result in a larger solid fraction. The present results illustrate that the suspended nanoparticles substantially increase the heat transfer rate and also the nanofluid heat transfer rate increases with an increase in the nanoparticles volume fraction. The increase of the heat release rate of the NEPCM shows its great potential for diverse thermal energy storage application.
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Doifode, Nitin, Sameer Gajghate, Abdul Najim, Anil Acharya, and Ashok Pise. "Effect of Uniformly and Nonuniformly Coated Al2O3 Nanoparticles over Glass Tube Heater on Pool Boiling." Journal of Nanoparticles 2016 (November 15, 2016): 1–6. http://dx.doi.org/10.1155/2016/8763171.

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Effect of uniformly and nonuniformly coated Al2O3 nanoparticles over plain glass tube heater on pool boiling heat transfer was studied experimentally. A borosilicate glass tube coated with Al2O3 nanoparticle was used as test heater. The boiling behaviour was studied by using high speed camera. Result obtained for pool boiling shows enhancement in heat transfer for nanoparticle coated surface heater and compared with plain glass tube heater. Also heat transfer coefficient for nonuniformly coated nanoparticles was studied and compared with uniformly coated and plain glass tube. Coating effect of nanoparticles over glass tube increases its surface roughness and thereby creates more nucleation sites.
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Prajapati, Om Shankar, and A. K. Rajvanshi. "Al2O3-Water Nanofluids in Convective Heat Transfer." Applied Mechanics and Materials 110-116 (October 2011): 3667–72. http://dx.doi.org/10.4028/www.scientific.net/amm.110-116.3667.

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Anofluids are suspensions of metallic or nonmetallic nanopowders in base liquid and can be employed to increase heat transfer rate in various applications. In this work turbulent flow forced convection heat transfer of Al2O3-water nanofluid inside an annular tube with variable wall temperature was investigated experimentally. The Nusselt number of nanofluid was obtained for various Reynolds numbers and nanoparticle concentrations at atmospheric pressure. The addition of nanoparticles in water enhances heat transfer coefficient and the enhancement increases with increase in the nanoparticle concentration and flow rate. Experimental results emphasize the enhancement of heat transfer due to nanoparticles presence in the fluid.
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Cui, Jinhui, Haixin Cui, Yan Wang, Changjiao Sun, Kui Li, Hongyan Ren, and Wei Du. "Application of PEI-Modified Magnetic Nanoparticles as Gene Transfer Vector for the Genetic Modification of Animals." Advances in Materials Science and Engineering 2012 (2012): 1–6. http://dx.doi.org/10.1155/2012/764521.

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To evaluate the performance of the magnetic nanoparticles as gene transfer vector for breeding transgenic animals, we investigated a new approach to deliver green fluorescent protein (GFP) gene to porcine kidney 15 (PK-15) and porcine embryonic fibroblast (PEF) cells using PEI-modified magnetic nanoparticles as gene vector. The morphology of the nanoparticles and nanoparticle/DNA complexes was characterized using scanning electron microscopy. It was found that the surface of the particles becomes coarse and rough with increased average diameter, which implied the effective conjugating between nanoparticles with DNA. The zeta potential of nanoparticle/DNA complexes drops down from +29.4 mV to +23.1 mV comparing with pure nanoparticles. Agarose gel electrophoresis experiments show that DNA plasmids can be protected effectively against degradation of exonuclease and endonuclease. The efficiency of gene delivery was affected by the mass ratio of nanoparticle/DNA and the amount of nanoparticle/DNA complexes. We confirm that the most optimal mass ratio of nanoparticle/DNA is 1 : 1 by conducting a series of experiments. This work provides important experimental basis for the application of the magnetic nanoparticles on gene delivery to porcine somatic cells, which is significant for the achieving of breeding new transgenic cloned pigs by using somatic cell nuclear transfer technique.
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Che Sidik, Nor Azwadi, Lee Yoke Keen, and Alireza Fazeli. "Computational Investigation of Heat Transfer of Nanofluids in Domestic Water Heat Exchanger." Applied Mechanics and Materials 695 (November 2014): 423–27. http://dx.doi.org/10.4028/www.scientific.net/amm.695.423.

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Recent development of nanotechnology led to the concept of using suspended nanoparticles in the heat transfer fluids to improve the heat transfer properties of the base fluids. The heat transfer enhancement by nanofluids is the significant concerns in the efficiency of domestic water heat exchanger system. A computational investigation of the heat transfer in a domestic water heat exchanger is conducted on the water and water-based nanofluids. Copper (Cu) nanoparticle and Alumina (Al2O3) nanoparticle are selected in the water-based nanofluids. Volume fraction of nanoparticle in the nanofluids is set at 0.5 %, 1.0 %, 1.5 %, 2.0 %, 2.5 %, and 3.0 %. Heat exchanger has been invented for the heat transfer from one medium to another medium in many heat transfer systems. Domestic water heat exchanger can be used in a heat pump domestic water heating system. The density, the thermal conductivity, and the dynamic viscosity of the water base fluid are increased while the specific heat capacity of the water base fluid is reduced with the addition of copper as well as alumina nanoparticle. Addition of copper nanoparticle into the water-based heat transfer fluid significantly increases the domestic hot water temperature. The efficiency of domestic water heat exchanger system is optimum when 1.5 % copper or alumina nanoparticle is added into the water-based heat transfer fluid.
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Karimi-Maleh, Hassan, Fatemeh Karimi, Abdollah FallahShojaei, Khalil Tabatabaeian, Mohammad Arshadi, and Morteza Rezapour. "Metal-based Nanoparticles as Conductive Mediators in Electrochemical Sensors: A Mini Review." Current Analytical Chemistry 15, no. 2 (February 19, 2019): 136–42. http://dx.doi.org/10.2174/1573411014666180319152126.

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Background: Modified electrodes are a new approach to improving the characteristics of the electrochemical sensors. The high conductivity and low charge transfer resistance are the major properties of new mediators for improving electrochemical sensors. Metal-based nanoparticles showed good electrical conductivity and can be selected as the suitbale mediator for modified electrodes. Objective: Recently, metal-based nanoparticles, such as Au nanoparticle, TiO2 nanoparticle, Fe3O4 nanoparticle and etc. were suggested as the suitable mediator for modification of solid electrodes. The high surface area and low charge transfer resistance of metal-based nanoparticles, suggested the exceptional intermediate in the electrochemical sensors. Here, we tried to consider these exceptional effects through reviewing some of the recently published works.
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Dissertations / Theses on the topic "Nanoparticle transfer"

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Hogg, Charles R. III. "Pattern Transfer from Nanoparticle Arrays." Research Showcase @ CMU, 2010. http://repository.cmu.edu/dissertations/14.

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This project contributes to the long-term extensibility of bit-patterned media (BPM), by removing obstacles to using a new and smaller class of self-assembling materials: surfactant-coated nanoparticles. Self-assembly rapidly produces regular patterns of small features over large areas. If these patterns can be used as templates for magnetic bits, the resulting media would have both high capacity and high bit density. The data storage industry has identified block copolymers (BCP) as the self-assembling technology for the first generation of BPM. Arrays of surfactant-coated nanoparticles have long shown higher feature densities than BCP, but their patterns could not previously be transferred into underlying substrates. I identify one key obstacle that has prevented this pattern transfer: the particles undergo a disordering transition during etching which I have called “cracking”. I compare several approaches to measuring the degree of cracking, and I develop two novel techniques for preventing it and allowing pattern transfer. I demonstrate two different kinds of pattern transfer: positive (dots) and negative (antidots). To make dots, I etch the substrate between the particles with a directional CF4-based reactive ion etch (RIE). I find the ultrasmall gaps (just 2nm) cause a tremendous slowdown in the etch rate, by a factor of 10 or more — an observation of fundamental significance for any pattern transfer at ultrahigh bit densities. Antidots are made by depositing material in the interstices, then removing the particles to leave behind a contiguous inorganic lattice. This lattice can itself be used as an etch mask for CF4-based RIE, in order to increase the height contrast. The antidot process promises great generality in choice of materials, both for the antidot lattice and the particles themselves; here, I present lattices of Al and Cr, templated from arrays of 13:7nm-diameter Fe3O4 or 30nm-diameter MnO nanoparticles. The fidelity of transfer is also noticeably better for antidots than for dots, making antidots the more promising technique for industrial applications. The smallest period for which I have shown pattern transfer (15:7nm) is comparable to (but slightly smaller than) the smallest period currently shown for pattern transfer from block copolymers (17nm); hence, my results compare favorably with the state of the art. Ultimately, by demonstrating that surfactant-coated nanoparticles can be used as pattern masks, this work increases their viability as an option to continue the exponential growth of bit density in magnetic storage media.
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Torki, Amir. "Mechanical Transfer of Optically Trapped Nanoparticle." Thesis, KTH, Skolan för elektro- och systemteknik (EES), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-200901.

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In this project, a mechanical system for transferring a silica nanoparticle is designedand implemented. This system is based on a mobile optical trap which enables 3Dmanipulation of a nanoparticle in high vacuum condition. The silica nanoparticle withdiameter 177nm is trapped at ambient pressure in first chamber called loading chamberat wavelength 1565nm. Then the pressure of loading chamber is reduced by vacuumpump to 10−5−10−6mbar. The second chamber is always kept in high vacuum. There isa vacuum valve between two chambers which isolates them from each other. As we openthe valve, the pressure inside the both chambers would be equilibrated. The trappednanoparticle is transferred to the second chamber with the distance around 20-25cm inless than 20-30 seconds with macroscopic scale resolution. During this long range transfer,we are able to perform microscopic transfer due to the presence of three nanopositionersaligned with three axes. No feedback system is used to stabilize particle motion for lowerpressure.
I detta master examensarbete ett mekaniskt system för överflyttning av en kiselnanopartikelär utformad och implementerad. Detta system bygger på en mobil optisk fälla sommöjliggör 3D manipulering av en nanopartikel i högt vakuumtillstånd. Kiselnanopartikelmed 177nm diameter fångas vid omgivningsryck och vid våglängden 1565nm i förstakammaren såkallad laddningskammaren. Sedan reduceras trycket i laddningskammarenmed vakuumpump till 10−5−10−6mbar. Den andra kammaren hålls alltid i högvakuum.I syfte att isolera dessa tvåkammare ifrån varandra finns det en vakuumventil emellankammarna. När ventilen öppnas trycket inne i båda kamrarna hålls i jämvikt ochden fångade nanopartikel överförs till den andra kammaren på en avståndet runt 20-25cm, på mindre än 20-30 sekunder med makroskopisk skala upplösning. Under dennalånga överföringsintervall, har vi möjlighet att utföra mikroskopisk överföring pågrundav närvaron av tre nanopositioners inriktade med tre axlar. Inget återkopplingssystem används för att stabilisera partikelrörelse för lägre tryck.
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Pradhan, Sulolit. "Solid state charge transfer in nanoparticle solids /." Diss., Digital Dissertations Database. Restricted to UC campuses, 2008. http://uclibs.org/PID/11984.

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Luongo, Kevin. "Nanoparticle-Based Spintronic Computer Logic Switch." FIU Digital Commons, 2019. https://digitalcommons.fiu.edu/etd/3962.

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Spintronics is a rapidly growing research field due to scalability, integrablility within existing VLSI architecture, significantly reduced switching energy and latency while maintaining stable bit orientation (Spin-up, Spin-down). For the first time sub-5nm Spin Transfer Torque –Magnetic Tunneling Junctions (STT-MTJ) were investigated utilizing various Integrated Circuit (IC) fabrication techniques to evaluate novel concepts in logic switches. Tunneling Magnetoresistance (TMR) was measured in STT-MTJ stacks of Ta/CoFeB/MgO/CoFeB/Ta with differing diameter ferrimagnetic CoFe2O4 nanoparticles (10nm, 4nm and 2nm) embedded in the MgO layer. MR was detected in the 2nm and 4nm particle devices and demonstrated evidence of single electron transport. Tri-layer STT-MTJ devices were fabricated using a thin film stack of Ta/Ru/Ta/CoFeB(M1)/MgO/CoFeB(M2)/MgO/CoFeB(M3)/Ta. The overall diameter of the stack was reduced to sub-20nm using Focused Ion Beam (FIB) to mill away extra material. The coercivities of the ferrimagnetic CoFeB layers were modified during thin film deposition by altering sputter conditions. Field Applied- Magnetic Force Microscopy (FA-MFM) was used to detect four different magnetic intensities corresponding to three discreet resistances in the singly addressed device, making this architecture a candidate for neuromorphic computational applications. Lastly a lithographic-less architecture was developed to mass fabricate and electo-mechanically probe multi-layered, single point, sub-5nm particle based STT-MTJ devices using off-the-shelf anodized nanoporous alumina. Once fabricated, the devices were probed to measure their IV characteristics and magnetoresistance (MR). The unprecedented MR changes on the order of 50,000% at room temperature suggest quantum mechanical behavior.
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Booker, Annette Casandra. "Optical Characterization and Evaluation of Dye-Nanoparticle Interactions." Thesis, Virginia Tech, 2006. http://hdl.handle.net/10919/36370.

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Surface plasmon resonance has become a widely investigated phenomenon in the past few years. Initially descriptive of light interactions with metallic films, research has branched out to encompass the nanoparticles as well. Generation of the maximum surface plasmon resonance for nanostructures is based on the resonance condition that the oscillatory behavior of the 'free' electrons on the surface of the particle become equivalent to the frequency of the excitation light; for films this required a specific geometry. Metallic nanoparticles have also interested researchers because of their unique optical properties. Depending on the metal, observations of quenching as well as fluorescence enhancement have been reported. Based on the phenomenon of surface plasmon resonance as well as the properties of metallic nanoparticles, this research reports the interaction of gold and silver nanoparticles in an aqueous dye solution. Our research is the basis for developing an optical sensor used for water treatment centers as an alarm mechanism. Due to the inefficiency of the fluorophore used in similar optodes, sufficient fluorescence was not obtained. With the addition of the nanoparticles, we hoped to observe the transfer of energy from the nanoparticle to the fluorophore to increase the overall intensity, thereby creating a sufficient signal. Using the excitation theories discovered by Raman, Mie, and Forster and Dexter as our foundation, we mixed a strongly fluorescent dye with gold nanoparticles and aagain with silver nanoparticles. After taken measurements via fluorescence spectroscopy, absorption spectroscopy, and photoluminescence excitation, we observed that the silver nanoparticles seemed to enhance the fluorescence of the dye while the gold nanoparticles quenched the fluorescence.
Master of Science
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Jenei, István Zoltán. "Nanoparticle assisted tribofilm formation and material transfer studied with SEM and TEM." Doctoral thesis, Stockholms universitet, Fysikum, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-114745.

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The discovery and subsequent synthesis of metal containing fullerenes- IFS (Inorganic Fullerene-like Structures) by R. Tenne et al. has generated considerable scientific interest with great potential impact in many industrial application areas such as lubrication. The lubrication mechanism (tribofilm formation) via exfoliation and deposition of the atomic layers from this cage-like IF-particles was revealed and demonstrated first by this research group. The incorporation of the nanoparticles into lubricants (oils, greases) is however not straightforward. When two surfaces are sliding against each other and a lubricant is used, a thin layer (tribofilm) is formed on the contact area. The friction reducing effects of the nanoparticles can be altered or hindered by certain additives that are used in lubricative oils. The effects of such additives on the tribological behavior of the nanoparticles are investigated by analyzing the tribofilms formed on the worn surfaces using energy-dispersive X-ray spectroscopy in a scanning electron microscope. Another challenge of nanoparticles in lubricants is the penetration of the nanoparticles into the contact zone. A possible solution of this problem is briefly discussed. A modified burnishing technique can be used to coat sliding metallic surfaces with a friction reducing tribofilm. The morphology and composition of these tribofilms was investigated with analytical electron microscopy techniques. In the second part of the thesis electron microscopy was used to investigate the material transfer. Titanium is an elements with high adhesive ability to the counter surface, it displays poor tribological properties in sliding metallic contacts. This can lead to material transfer and consequently severe surface damage. The cold formation and machining of titanium, thus can lead rapid tool wear and poor surface finish. Electron microscopy techniques were used to study the mechanism of titanium transfer to different counter surfaces.
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Park, Sunho 1976. "Control of oligonucleotide conformation on nanoparticle surfaces for nanoscale heat transfer study." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/27120.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2004.
Includes bibliographical references (leaves 77-82).
Metal nanoparticles can be used as antennae covalently linked to biomolecules. External alternating magnetic field can turn on and off the biological activity of the molecules due to induction heating from the particles that changes the temperature around the molecules. Here an experimental scheme towards direct temperature probing is proposed to predict the behavior of the antenna. Oligonucleotides modified with photosensitive molecules are conjugated with gold nanoparticles and report the temperature at their positions within some nanometers' distance from the particles. However, oligos have a known tendency to stick to gold surfaces. To locate the probes at desired position, 6-mercapto-1-hexanol (MCH) is used to reduce oligonucleotides' adsorption to the surface of gold. The experimental result shows that oligos on particle's surface can be stretched radially without any reduction of coverage ratio. Optimal MCH concentration and reaction time highly depend on the concentration of MCH and the conjugates as well as reaction time and the size of the molecules.
by Sunho Park.
S.M.
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Fermi, Andrea. "Polysulfurated aromatic compounds : Préparation and photophysical properties." Thesis, Aix-Marseille, 2013. http://www.theses.fr/2013AIXM4124.

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Durant mon Doctorat de Sciences Chimiques, effectué en cotutelle entre l'Université de Bologne et l'Université de Aix-Marseille, j'ai pris en charge la synthèse et la caractérisation d'une série de composés aromatiques soufrés qui bénéficient de propriétés photophysiques intéressantes. Ce travail de thèse a été concentré sur deux classes de composés : la première s'apparente à des astérisques moléculaires contenant un coeur benzénique persoufré, fonctionnalisé avec des unités périphériques aromatiques. Dans chaque cas, des groupes stériquement encombrants ont été greffés sur les unités aromatiques situées à la périphérie des molécules. Ces molecules offrent la capacité de fonctionner comme luminophore AIE (Emission Induite par l'Agrégation) à l'état solide ou dans des milieux à haute rigidité. La deuxième famille de molécule est basée sur la même géométrie en astérisque. Cependant, chaque ligand de cette série utilise des unités terpyridyles comme unité périphérique, capables d'interagir avec des métaux de transition comme le fer(III) et le zinc. Suite à la complexation du zinc les propriétés photophysiques peuvent être modulées en fonction de la rigidité du système. Enfin, on a synthetisé un troisième type de système qui a été obtenu par le remplacement du coeur benzénique des astérisques par une fonction pyrene polysoufrée, en conservant les mêmes unités périphériques. Ce composé a montré des propriétés photophysiques intéressantes mais aussi des capacités de coordinations vers les ions métalliques (Fe(III), Zn(II) et le Nd(III)), ce qui a permis la génération d'émission dans le domaine du proche infrarouge
The aim of this thesis was the synthesis and photophysical characterization of some new polysulfurated aromatic compounds: this class of molecules can offer intriguing properties, potentially useful for the construction of new materials for optoelectronic devices. Two main families of compounds have been synthesized: the first is represented by a series of small molecular asterisks, with peripheral aromatic units, showing luminescence in solid phase or in highly rigid conditions. All compounds with peripheral substituents display an AIE behavior (Aggregation Induced Emission) with radiative deactivation of the triplet states. Taking inspiration from these smaller asterisks, a larger molecule with the same geometry has been designed, decorated with terpyridyl moieties as the outermost units: this compound shows great affinity for the coordination of several transition metal ions, changing luminescence properties after the interaction with zinc ions. With the same intentions, a tetrasulfurated pyrene-core molecule with terpyridyl external units has been synthesized and isolated: this ligand exhibits good coordination capabilities towards transition metal ions, giving rise to luminescent nanoaggregates upon addition of zinc(II), characterized by DLS and AFM microscopy. In addition a NIR emission is recorded after coordination of neodymium(III), showing evidence of an intramolecular energy transfer process
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Holladay, Robert Tyler. "Incorporating Magnetic Nanoparticle Aggregation Effects into Heat Generation and Temperature Profiles for Magnetic Hyperthermia Cancer Treatments." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/64507.

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In treating cancer, a primary consideration is the target specificity of the treatment. This is a measure of the treatment dose that the cancerous (target) tissue receives compared to the dose that healthy tissue receives. Nanoparticle (NP) based treatments offer many advantages for target specificity compared to other forms of treatment due to their ability to selectively target tumors. One benefit of using magnetic NPs is their ability to release heat, which can both sensitize tumors to other forms of treatment as well as damage the tumor. The work here aims to incorporate a broad range of relevant physics into a comprehensive model. NP aggregation is known to be a large source of uncertainty in these treatments, thus a framework has been developed that can incorporate the effects of aggregation on NP diffusion, NP heat release, temperature rise, and overall thermal damage. To quanitify thermal damage in both healthy tissue and tumor tissue, the Cumulative Equivalent Minutes at 43 textcelsius~model is used. The Pennes bioheat equation is used as the governing equation for the temperature rise and included in it is a source heating term due to the NPs. NP diffusion and aggregation are simulated via a random walk process, with a probability of aggregation determining if nearest neighbor particles aggregate at each time step. Additionally, models are developed that attempt to incorporate aggregation effects into NP heat dissipation, though each proves to only be accurate when there is little aggregation occurring. In this work, verification analyses are done for each of the above areas and, at minimum, qualitatively accurate results have been achieved. Verification results of this work show that aggregation can be neglected at concentrations on the order of $100~nM$ or less. This however only serves as a rough estimation and further work is needed to gain a better quantitative understanding of the effects of NP concentration on aggregation. Using this concentration as a limitation, results are presented for a variety of tumor sizes and concentration distributions. Because this work incorporates a variety of physics and numerical methods into a single encompassing model, depth and physical accuracy in each area (bio-heat transfer, diffusion via random walk, NP energy dissipation, and aggregation) have been somewhat limited. This does however provide a framework in which each of the above areas can be further developed and their effects examined in the overall course of treatment.
Master of Science
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Syed, Lateef Uddin. "Nanoelectrode and nanoparticle based biosensors for environmental and health monitoring." Diss., Kansas State University, 2012. http://hdl.handle.net/2097/13701.

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Doctor of Philosophy
Department of Chemistry
Jun Li
Reduction in electrode size down to nanometers dramatically enhances the detection sensitivity and temporal resolution. Here we explore nanoelectrode arrays (NEAs) and nanoparticles in building high performance biosensors. Vertically aligned carbon nanofibers (VACNFs) of diameter ~100 nm were grown on a Si substrate using plasma enhanced chemical vapor deposition. SiO[subscript]2 embedded CNF NEAs were then fabricated using techniques like chemical vapor deposition, mechanical polishing, and reactive ion etching, with CNF tips exposed at the final step. The effect of the interior structure of CNFs on electron transfer rate (ETR) was investigated by covalently attaching ferrocene molecules to the exposed end of CNFs. Anomalous differences in the ETR were observed between DC voltammetry (DCV) and AC voltammetry (ACV). The findings from this study are currently being extended to develop an electrochemical biosensor for the detection of cancerous protease (legumain). Preliminary results with standard macro glassy carbon electrodes show a significant decrease in ACV signal, which is encouraging. In another study, NEA was employed to capture and detect pathogenic bacteria using AC dielectrophoresis (DEP) and electrochemical impedance spectroscopy (EIS). A nano-DEP device was fabricated using photolithography processes to define a micro patterned exposed active region on NEA and a microfluidic channel on macro-indium tin oxide electrode. Enhanced electric field gradient at the exposed CNF tips was achieved due to the nanometer size of the electrodes, because of which each individual exposed tip can act as a potential DEP trap to capture the pathogen. Significant decrease in the absolute impedance at the NEA was also observed by EIS experiments. In a final study, we modified gold nanoparticles (GNPs) with luminol to develop chemiluminescence (CL) based blood biosensor. Modified GNPs were characterized by UV-Vis, IR spectroscopy and TEM. We have applied this CL method for the detection of highly diluted blood samples, in both intact and lysed forms, which releases Fe[superscipt]3[superscript]+ containing hemoglobin to catalyze the luminol CL. Particularly, the lysed blood sample can be detected even after 10[superscript]8 dilution (corresponding to ~0.18 cells/well). This method can be readily developed as a portable biosensing technique for rapid and ultrasensitive point-of-care applications.
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Books on the topic "Nanoparticle transfer"

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Symposium on Charge Transfer Processes in Semi-Conductor and Metal Nanoparticles (2004 San Antonio, Tex.). Electron transfer in nanomaterials: Proceedings of the international symposium. Edited by Rumbles G, Lian T, Murakoshi K, Electrochemical Society. Fullerenes, Nanotubes, and Carbon Nanostructures Division., Electrochemical Society. Energy Technology Division., and Electrochemical Society Meeting. Pennington, NJ: Electrochemical Society, 2006.

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Abraham, J. P., W. J. Minkowycz, and E. Sparrow. Nanoparticle Heat Transfer and Fluid Flow. Taylor & Francis Group, 2016.

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Nanoparticle Heat Transfer and Fluid Flow. Taylor & Francis Group, 2017.

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Nanoparticle Heat Transfer and Fluid Flow. CRC Press, 2013.

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Minkowycz, W. J., E. Sparrow, and J. P. Abraham, eds. Nanoparticle Heat Transfer and Fluid Flow. CRC Press, 2016. http://dx.doi.org/10.1201/b12983.

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Jolivet, Jean-Pierre. Metal Oxide Nanostructures Chemistry. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780190928117.001.0001.

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This much-anticipated new edition of Jolivet's work builds on the edition published in 2000. It is entirely updated, restructured and increased in content. The book focuses on the formation by techniques of green chemistry of oxide nanoparticles having a technological interest. Jolivet introduces the most recent concepts and modelings such as dynamics of particle growth, ordered aggregation, ionic and electronic interfacial transfers. A general view of the metal hydroxides, oxy-hydroxides and oxides through the periodic table is given, highlighting the influence of the synthesis conditions on crystalline structure, size and morphology of nanoparticles. The formation of aluminum, iron, titanium, manganese and zirconium oxides are specifically studied. These nanomaterials have a special interest in many technological fields such as ceramic powders, catalysis and photocatalysis, colored pigments, polymers, cosmetics and also in some biological or environmental phenomena.
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Bang, Jungsik. Effects of excitation density and energy transfer on cathodoluminescence from powder phosphors with and without embedded nanoparticles. 2004.

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Book chapters on the topic "Nanoparticle transfer"

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Lee, Dongwon, and Shyam S. Mohapatra. "Chitosan Nanoparticle-Mediated Gene Transfer." In Methods in Molecular Biology, 127–40. Totowa, NJ: Humana Press, 2008. http://dx.doi.org/10.1007/978-1-59745-237-3_8.

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Michaelides, Efstathios E. "Fundamentals of Nanoparticle Flow and Heat Transfer." In Nanofluidics, 1–45. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-05621-0_1.

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Sangeetha, Jeyabalan, Khan Mohd Sarim, Devarajan Thangadurai, Amrita Gupta, Renu, Abhishek Mundaragi, Bhavisha Prakashbhai Sheth, Shabir Ahmad Wani, Mohd Farooq Baqual, and Huma Habib. "Nanoparticle-Mediated Plant Gene Transfer for Precision Farming and Sustainable Agriculture." In Nanotechnology for Agriculture, 263–84. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-32-9370-0_14.

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Kumar Nagilla, Dheeraj, and Ravi Kumar Sharma. "Numerical Study for the Solidification of Nanoparticle-Enhanced Phase Change Materials (NEPCM) Filled in a Wavy Cavity." In Numerical Heat Transfer and Fluid Flow, 141–49. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-1903-7_17.

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LeBrun, Alexander, and Liang Zhu. "Magnetic Nanoparticle Hyperthermia in Cancer Treatment: History, Mechanism, Imaging-Assisted Protocol Design, and Challenges." In Theory and Applications of Heat Transfer in Humans, 631–67. Chichester, UK: John Wiley & Sons Ltd, 2018. http://dx.doi.org/10.1002/9781119127420.ch29.

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Visser, Ann E., Nicholas J. Bridges, Brenda L. Garcia-Diaz, Joshua R. Gray, and Elise B. Fox. "Al2O3-Based Nanoparticle-Enhanced Ionic Liquids (NEILs) for Advanced Heat Transfer Fluids." In ACS Symposium Series, 259–70. Washington, DC: American Chemical Society, 2012. http://dx.doi.org/10.1021/bk-2012-1117.ch012.

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Ding, Shijie, Maciej Radosz, and Youqing Shen. "Magnetic Nanoparticle Supported Catalyst for Atom Transfer Radical Polymerization of Methyl Methacrylate." In ACS Symposium Series, 71–84. Washington, D C: American Chemical Society, 2006. http://dx.doi.org/10.1021/bk-2006-0944.ch006.

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Yu, Mingzhou, and Yueyan Liu. "Taylor-series Expansion Method of Moments for Size-distributed Micro- and Nanoparticle Systems under Drying Condition." In Heat and Mass Transfer in Drying of Porous Media, 189–202. Boca Raton: Taylor & Francis, a CRC title, part of the Taylor & Francis imprint, a member of the Taylor & Francis Group, the academic division of T&F Informa, plc, [2020] | Series: Advances in drying science and technology: CRC Press, 2019. http://dx.doi.org/10.1201/9781351019224-8.

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Rieck, Sarah, Katrin Zimmermann, and Daniela Wenzel. "Transduction of Murine Embryonic Stem Cells by Magnetic Nanoparticle-Assisted Lentiviral Gene Transfer." In Methods in Molecular Biology, 89–96. Totowa, NJ: Humana Press, 2013. http://dx.doi.org/10.1007/7651_2013_6.

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Ray, Paresh Chandra, Gopala Krishna Darbha, Oleg Tovmachenko, Uma Shanker Rai, Jelani Griffin, William Hardy, and Ana Balarezo. "Gold Nanoparticle Based Surface Energy Transfer Probe for Accurate Identification of Biological Agents DNA." In ACS Symposium Series, 115–29. Washington DC: American Chemical Society, 2009. http://dx.doi.org/10.1021/bk-2009-1016.ch009.

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Conference papers on the topic "Nanoparticle transfer"

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Yuksel, Anil, Michael Cullinan, and Jayathi Murthy. "Thermal Energy Transport Below the Diffraction Limit in Close-Packed Metal Nanoparticles." In ASME 2017 Heat Transfer Summer Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/ht2017-4968.

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Fabrication of micro and nanoscale electronic components has become increasingly demanding due to device and interconnect scaling combined with advanced packaging and assembly for electronic, aerospace and medical applications. Recent advances in additive manufacturing have made it possible to fabricate microscale, 3D interconnect structures but heat transfer during the fabrication process is one of the most important phenomena influencing the reliable manufacturing of these interconnect structures. In this study, optical absorption and scattering by three-dimensional (3D) nanoparticle packings are investigated to gain insight into micro/nano heat transport within the nanoparticles. Because drying of colloidal solutions creates different configurations of nanoparticles, the plasmonic coupling in three different copper nanoparticle packing configurations were investigated: simple cubic (SC), face-centered cubic (FCC) and hexagonal close packing (HCP). Single-scatter albedo (ω) was analyzed as a function of nanoparticle size, packing density, and configuration to assess effect for thermo-optical properties and plasmonic coupling of the Cu nanoparticles within the nanoparticle packings. This analysis provides insight into plasmonically enhanced absorption in copper nanoparticle particles and its consequences for laser heating of nanoparticle assemblies.
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Attaluri, Anilchandra, Ronghui Ma, and Liang Zhu. "Quantification of Nanoparticle Distribution in Tissue After Direct Injection Using MicroCT Imaging." In 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-22139.

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Magnetic nanoparticles have been used in clinical and animal studies to generate localized heating for tumor treatments when the particles are subjected to an external alternating magnetic field. One approach to deliver the nanoparticles is via directly injecting the nanoparticles in the extracellular space of the tumor. Its advantage is that multiple-site injections can be exploited to cover the entire target region in the case of an irregularly shaped tumor. Currently since most tissue is opaque, the detailed information of the nanoparticle spreading after the injection can not be visualized directly and it is often quantified by indirect methods such as temperature measurements to inversely determine the distribution. In this study, we use a high-resolution microCT imaging system to investigate the nanoparticle concentration distribution in a tissue equivalent agarose gel. The preliminary results are promising to obtain a 3-D distribution of the ferrofluid in tissue. The local density variations induced by the nanoparticles in the vicinity of the injection site can be detected and analyzed by the microCT system. Experiments are performed to study how the injection amount, gel concentration, and nanoparticle concentration in the ferrofluid affect nanoparticle spreading in the gel. The obtained quantified information is important for future studies of temperature elevations in opaque tumor to design optimized treatment protocols.
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Soni, Sanjeev, Himanshu Tyagi, Robert A. Taylor, and Amod Kumar. "Effect of Nanoparticle Concentration on Thermal Damage in Nanoparticle-Assisted Thermal Therapy." In ASME 2016 5th International Conference on Micro/Nanoscale Heat and Mass Transfer. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/mnhmt2016-6418.

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Photothermal therapy involving nanoparticles is evolving as a promising targeted treatment for cancer. This paper presents the results for the effect of nanoparticle concentration, within a tumor, to control the thermal damage during nanoparticle assisted thermal therapy. A surface tumor embedded with gold nanoparticles (distributed uniformly) is considered. The thermal damage is evaluated for various nanoparticle concentrations (within the tumor) to identify an optimal concentration of the nanoparticles so as to achieve spatial confinement of the damage to the tumor region. Optical interaction is coupled to the biological heat transfer through Pennes’ bioheat model and Beer’s law. Spatiotemporal thermal damage is simulated through the Arrhenius method. The finite difference implicit method is used to solve the coupled phenomenon. Results show that there is a specific value of nanoparticle concentration at which it is possible to confine thermal damage to the tumor within a spatial scale of less than 1 mm. This way the healthy tissues surrounding a tumor are safe. This optimum value of nanoparticle concentration (irrespective of tumor diameters) is 0.00001%. This concentration along with irradiation intensity of 1 W/cm2 for irradiation duration of 110 seconds is sufficient to thermally ablate the considered tumors. Novelty of this study is that it presents a combination of the controlling parameters for achieving a high (<1 mm) spatial confinement of the thermal damage. This finding is very much significant from clinical point of view. Clinically it is always desired to attain the therapeutic efficacy with minimal delivery of external agents (nanoparticles in this case) to a patient.
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Singh, Manpreet, Qimei Gu, Ronghui Ma, and Liang Zhu. "Temperature Distribution and Thermal Dosage Affected by Nanoparticle Distribution in Tumours During Magnetic Nanoparticle Hyperthermia." In ASME 2019 6th International Conference on Micro/Nanoscale Heat and Mass Transfer. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/mnhmt2019-4233.

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Abstract Recent microCT imaging study has demonstrated that local heating caused a much larger nanoparticle distribution volume in tumors than that in tumors without localized heating, suggesting possible nanoparticle redistribution/migration during heating. In this study, a theoretical simulation is performed to evaluate to what extent the nanoparticle redistribution affects the temperature elevations and thermal dosage required to cause permanent thermal damage to PC3 tumors. Two tumor groups with similar sizes are selected. The control group consists of five PC3 tumors with nanoparticles distribution without heating, while the experimental group consists of another five resected PC3 tumors with nanoparticles distribution obtained after 25 minutes of local heating. Each generated tumor model is attached to a mouse body model by microCT scans. A previously determined relationship between the nanoparticle concentration distribution and the volumetric heat generation rate is implemented in the theoretical simulation of temperature elevations during magnetic nanoparticle hyperthermia. Our simulation results show that the average steady state temperature elevation in the tumors of the control group is higher than that in the experimental group when the nanoparticles are more spreading from the tumor center to tumor periphery (control group: 64.03±3.2°C vs. experimental group: 62.04±3.07°C). Further we assess the thermal dosage needed to cause 100% permanent thermal damage (Arrhenius integral Ω = 4) to the entire tumor, based on the assumption of unchanged nanoparticle distribution during heating. The average heating time based on the experimental setting from our previous studies demonstrates significantly different designs. Specifically, the average heating time for the control group is 24.3 minutes. However, the more spreading of nanoparticles to tumor periphery in the experimental group results in a much longer heating time of 38.1 minutes, 57° longer than that in the control group, to induce permanent thermal damage to the entire tumor. The results from this study suggest that the heating time needed when considering dynamic nanoparticle migration during heating is probably between 24 to 38 minutes. In conclusion, the study demonstrates the importance of including dynamic nanoparticle spreading during heating into theoretical simulation of temperature elevations in tumors to determine accurate thermal dosage needed in magnetic nanoparticle hyperthermia design.
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Yu, Qun, Chao Zhu, Robert Pfeffer, and Rajesh N. Dave. "Experimental Study on Fluidization Characteristics of Nanoparticles." In ASME 2004 Heat Transfer/Fluids Engineering Summer Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/ht-fed2004-56269.

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Recent studies show that nano-sized particles can be fluidized in the form of nanoparticle agglomerates. However, fluidization behavior such as the minimum fluidization velocity and fluidization regime differ significantly for different nanoparticles. Hence this paper is aimed to experimentally investigate the general fluidization characteristics of different nanoparticles. It is interesting to note that a fluidized bed of nanoparticle agglomerates is optically semi-transparent due to the extremely high porosity (typically over 99%) of the bed with respect to the primary materials of nanoparticles. Taking advantage of this unique feature, traditional optical measurement techniques are applied to visualize the flow structure as well as to measure the size of the fluidizing nanoparticle agglomerates. Based on measurements of four different nanoparticle materials, two types of fluidization behavior have been identified, which closely resemble those of classical Geldart Group A and Group B particles, respectively. It shows, however, that the bed of “Group A” nanoparticles expands as long as there is a flow through the bed, which is different from the classical fluidization of Geldart Group A particles where there is no bed expansion until reaching the minimum fluidization velocity. It is also noted that, based on the apparent density and size, the fluidization behavior of nanoparticle agglomerates do not precisely follow the Geldart classification. To differentiate these particles with very similar fluidization characteristics, terms the APF and ABF are introduced for the fluidization classification of nanoparticle agglomerates. Typical fluidization characteristics including bed expansion, bed pressure drop and hysteresis effects of both APF and ABF nanoparticles. The sizes of nanoparticle agglomerates also have been measured using an in-situ optical measurement system.
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Meng, Fanhe, Jin Liu, and Robert F. Richards. "Molecular Dynamics Study on Thermal Resistance Between Amorphous Silica Nanoparticles." In ASME 2017 Heat Transfer Summer Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/ht2017-4894.

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Nanoparticle-based materials have demonstrated extremely low thermal conductivities, a property that has made them attractive candidates in a variety of macroscale and microscale applications. Understanding the thermal transport between nanoparticles is necessary for the further development of these materials. Molecular dynamics simulation is an effective method to investigate thermal transport on these scales because no assumption about phonon transmission at the nanoparticle interface, nor prior knowledge of thermal transport of the system is necessary. In this work, the total thermal resistance between adjacent amorphous silica nanoparticles is calculated using non-equilibrium molecular dynamics simulations (NEMD). Numerical results show that interparticle resistance depends strongly on the forces between particles, in particular the presence or absence of chemical bonds between nanoparticles. In addition, the effect of interfacial force strength on thermal resistance increases as nanoparticle diameter decreases. Numerical results are compared to interparticle resistances determined from the predictions of the analytical constriction resistance model. The simulation results are shown to be in good agreement the constriction resistance theory depending on the choice of surface energy.
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Yuksel, Anil, Edward T. Yu, Michael Cullinan, and Jayathi Murthy. "Heat Transfer Modeling of Nanoparticle Packings on a Substrate." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-88642.

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The temperature evolution of nanoparticle packings on a substrate under high laser power is investigated both experimentally and via numerical simulations. Numerical modeling of temperature distributions in copper nanoparticle packings on a glass substrate is performed and results are compared with experiment under 2.6 kW/cm2 laser power. A coupled electromagnetic-heat transfer model is implemented to understand the nanoparticle temperature distribution. Very good agreement between the coupled electromagnetic-heat transfer model and the experimental results is obtained by matching the interfacial thermal conductance, G, between the nanoparticles using the experimental result in the coupled electromagnetic-heat transfer model.
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Liu, Fang, and Yang Cai. "Effects of Particle Shape on Nanofluids Laminar Forced Convection in Helically Coiled Tubes." In ASME 2017 Heat Transfer Summer Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/ht2017-4722.

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In this study, effects of particle morphology (shape and size) on nanofluids laminar forced convection in helically coiled tubes are investigated numerically using Eulerian-Lagrangian two-phase approach. The laminar forced convective heat transfer and pressure drop of Al2O3-water nanofluids containing nanoparticles with various particle shapes (sphere, platelet, blade, cylinder and brick) and sizes at different volume fractions in the developing and fully developed regions are investigated using the validated two-phase model. It is found that the nanofluids containing platelet particle shape has the highest heat transfer enhancement, which is followed by nanofluids containing cylinder, blade, sphere and brick nanoparticle shapes, respectively. Non-spherical nanoparticles with larger aspect ratio, small particle size and a suitable particle volume concentration are beneficial for heat transfer enhancement of forced convection. Heat transfer efficiency reaches minima at Re of 1250 for laminar forced convection with 1% volume fraction. The correlations of Nusselt number and pressure drop with nanoparticle shape and size were developed to predict convective heat transfer of nanofluids containing spherical nanoparticles and non-spherical nanoparticles.
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Kim, Kyung Mo, Seung Won Lee, and In Cheol Bang. "Reflood Heat Transfer in SiC and Graphene Oxide Coated Tubes." In ASME 2013 4th International Conference on Micro/Nanoscale Heat and Mass Transfer. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/mnhmt2013-22048.

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Quenching experiments were conducted to investigate the effect of nanoparticle deposition on boiling heat transfer during rapid quenching in long vertical tubes. SiC and graphene oxide (GO) nanoparticles were deposited by boiling 0.01 vol% SiC/water and GO/water nanofluids in the vertical tube for 600 and 900 s to observe the repeatability of the nanoparticle deposition. Reflood tests were performed by passing water through bare tube and nanoparticle-coated tube at a constant flow rate (3 cm/s). Quenching curves (temperature vs. time) and saturated boiling curves were obtained at atmospheric pressure. We observed a more enhanced cooling performance in nanoparticle-coated tubes. The quenching time of tubes coated with SiC nanoparticles for 600 and 900 s were reduced by more than 20 and 25 s, respectively, compared to that of the bare tube. For the tubes boiled with GO nanoparticles for 600 and 900 s, the quenching times decreased by 10 and 12 s, respectively, compared to that of the bare tube. Scanning Electron Microscopy (SEM) images were acquired, and the contact angles were measured to observe the effects of surface structures and wettability on the cooling performance.
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Li, Lirong, and Yong Tae Kang. "Three-Dimensional Simulation of Bubble Behavior and Mass Transfer for CO2 Absorption in Nanoabsorbents." In ASME 2019 6th International Conference on Micro/Nanoscale Heat and Mass Transfer. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/mnhmt2019-3944.

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Abstract CO2 absorption performance in gas-liquid system is affected by nanoparticles. The enhancement mechanisms involved have been extensively paid attention. The CO2 gas bubble behaviors and the characteristics of the nanoparticle motion have been clarified in the present study. The equivalent substitution method is used to regard the liquid with nanoparticles as a continuous term with changed physical properties, that is, nanofluid. Therefore, the volume-of-fluid (VOF) method is employed to well predict the gas bubble behaviors and mass transfer coefficient in nanofluid. It is found that the mass transfer coefficient in the gas-liquid system for CO2 absorption can be significantly enhanced by Al2O3 nanoparticles. With the increase of nanoparticles volume concentration, the surface renewal frequency increases dramatically. The discrete-particle-method (DPM) is adopted to track the motion of nanoparticles. In this way, the deformation of the bubbles and the motion of the nanoparticle are well captured. It is concluded that the enhanced mass transfer coefficient in gas-liquid-nanoparticle system is not only related to the Brownian motion of the particles, but also related to the nanoparticle deduced turbulence in the liquid field.
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Reports on the topic "Nanoparticle transfer"

1

Kedzierski, Mark A. Effect of CuO nanoparticle concentration on R134alubricant pool boiling heat transfer with extensive analysis. Gaithersburg, MD: National Institute of Standards and Technology, 2007. http://dx.doi.org/10.6028/nist.ir.7450.

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Kedzierski, Mark A., and Maoqiong Gong. Effect of CuO nanoparticle concentration on R134a pool boiling heat transfer with extensive measurement and analysis detail. Gaithersburg, MD: National Institute of Standards and Technology, 2007. http://dx.doi.org/10.6028/nist.ir.7454.

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Dixon, David Adams. Final Report: The Impact of Carbonate on Surface Protonation, Electron Transfer and Crystallization Reactions in Iron Oxide Nanoparticles and Colloids. Office of Scientific and Technical Information (OSTI), July 2013. http://dx.doi.org/10.2172/1086712.

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