Academic literature on the topic 'Colloidal Nanomaterisls'
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Journal articles on the topic "Colloidal Nanomaterisls"
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Wang, Yongsheng, Haiyan Huo, Xueren Qian, and Jing Shen. "Colloids, nanostructures, and supramolecular assemblies for papermaking." BioResources 15, no. 3 (May 1, 2020): 4646–49. http://dx.doi.org/10.15376/biores.15.3.4646-4649.
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The dominating role of colloid science in papermaking processes, as exemplified by wet-end chemistry, is now well known. The concept of colloids dates back to about 160 years ago. In certain cases, however, the term “colloids” can have an overlapping meaning with the modern terms “nanomaterials” and “supramolecular assemblies”. The latter terms, and the scientists who have gravitated to those terms, have enriched colloid science, providing new insights into colloidal systems. It is proposed here that reconsidering papermaking in light of these multi-disciplinary sciences has potential to facilitate effective teaching and learning pertaining to universities that have pulp and paper programs. Enhanced integration of basic sciences with papermaking may further our understanding and broaden existing research areas, which is likely to create breakthroughs in basic research, applied research, and product development.
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Zhang, Dongshi, Wonsuk Choi, Jurij Jakobi, Mark-Robert Kalus, Stephan Barcikowski, Sung-Hak Cho, and Koji Sugioka. "Spontaneous Shape Alteration and Size Separation of Surfactant-Free Silver Particles Synthesized by Laser Ablation in Acetone during Long-Period Storage." Nanomaterials 8, no. 7 (July 13, 2018): 529. http://dx.doi.org/10.3390/nano8070529.
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The technique of laser ablation in liquids (LAL) has already demonstrated its flexibility and capability for the synthesis of a large variety of surfactant-free nanomaterials with a high purity. However, high purity can cause trouble for nanomaterial synthesis, because active high-purity particles can spontaneously grow into different nanocrystals, which makes it difficult to accurately tailor the size and shape of the synthesized nanomaterials. Therefore, a series of questions arise with regards to whether particle growth occurs during colloid storage, how large the particle size increases to, and into which shape the particles evolve. To obtain answers to these questions, here, Ag particles that are synthesized by femtosecond (fs) laser ablation of Ag in acetone are used as precursors to witness the spontaneous growth behavior of the LAL-generated surfactant-free Ag dots (2–10 nm) into different polygonal particles (5–50 nm), and the spontaneous size separation phenomenon by the carbon-encapsulation induced precipitation of large particles, after six months of colloid storage. The colloids obtained by LAL at a higher power (600 mW) possess a greater ability and higher efficiency to yield colloids with sizes of <40 nm than the colloids obtained at lower power (300 mW), because of the generation of a larger amount of carbon ‘captors’ by the decomposition of acetone and the stronger particle fragmentation. Both the size increase and the shape alteration lead to a redshift of the surface plasmon resonance (SPR) band of the Ag colloid from 404 nm to 414 nm, after storage. The Fourier transform infrared spectroscopy (FTIR) analysis shows that the Ag particles are conjugated with COO– and OH– groups, both of which may lead to the growth of polygonal particles. The CO and CO2 molecules are adsorbed on the particle surfaces to form Ag(CO)x and Ag(CO2)x complexes. Complementary nanosecond LAL experiments confirmed that the particle growth was inherent to LAL in acetone, and independent of pulse duration, although some differences in the final particle sizes were observed. The nanosecond-LAL yields monomodal colloids, whereas the size-separated, initially bimodal colloids from the fs-LAL provide a higher fraction of very small particles that are <5 nm. The spontaneous growth of the LAL-generated metallic particles presented in this work should arouse the special attention of academia, especially regarding the detailed discussion on how long the colloids can be preserved for particle characterization and applications, without causing a mismatch between the colloid properties and their performance. The spontaneous size separation phenomenon may help researchers to realize a more reproducible synthesis for small metallic colloids, without concern for the generation of large particles.
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Liu, Gang, Chong Zhang, Mingzhi Zhao, Wenbo Guo, and Qiang Luo. "Comparison of Nanomaterials with Other Unconventional Materials Used as Additives for Soil Improvement in the Context of Sustainable Development: A Review." Nanomaterials 11, no. 1 (December 23, 2020): 15. http://dx.doi.org/10.3390/nano11010015.
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Since the concept of sustainable development enjoys popular support in the 21st century, various kinds of unconventional materials were introduced for soil improvement in the past few decades to replace the traditional materials like concrete and lime. This paper compared nanomaterials with other three kinds of representative unconventional materials to demonstrate its superiority in soil treatment. The other three kinds of unconventional materials include microbially induced calcite precipitation (MICP), recycled tire and environmental fiber. Nanomaterial and MICP have a comprehensive effect on soil reinforcement, since they can improve shear strength, adjust permeability, resist liquefaction and purify the environment. Recycled tire and environmental fibers are granular materials that are mostly adopted to reinforce reconstituted soil. The reinforcement mechanisms and effects of these four kinds of unconventional materials are discussed in detail, and their price/performance ratios are calculated to make an evaluation about their market application prospects. It can be seen that nanomaterials have promising prospects. Colloidal silica, bentonite and laponite present a satisfactory effect on liquefaction mitigation for sandy foundation, and carbon nanotube has an aptitude for unconfined compressive strength improvement. Among the investigated nanomaterials, colloidal silica is the closest to scale market application. Despite the advantages of nanomaterials adopted as additives for soil improvement, they are known for unwanted interactions with different biological objects at the cell level. Nevertheless, research on nanomaterials that are adopted for soil improvement are very promising and can intensify the relationship between sustainable development and geotechnical engineering through innovative techniques.
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Taniguchi, Takaaki, Leanddas Nurdiwijayanto, Renzhi Ma, and Takayoshi Sasaki. "Chemically exfoliated inorganic nanosheets for nanoelectronics." Applied Physics Reviews 9, no. 2 (June 2022): 021313. http://dx.doi.org/10.1063/5.0083109.
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Two-dimensional (2D) nanomaterials constitute one of the most advanced research targets in materials science and engineering in this century. Among various methods for the synthesis of 2D nanomaterials, including top-down exfoliation and bottom-up crystal growth, chemical exfoliation has been widely used to yield monolayers of various layered compounds, such as clay minerals, transition metal chalcogenides (TMDCs), and oxides, long before the discovery of graphene. Soft chemical exfoliation is a technique to weaken the layer-to-layer interaction in layered compounds by chemical modification of interlayer galleries, which promotes monolayer exfoliation. The chemical exfoliation process using organic substances, typically amines, has been applied to a range of layered metal oxides and hydroxides for two decades, establishing high-yield exfoliation into their highly crystalline monolayers and colloidal integration processes have been developed to assemble the resultant 2D nanomaterials into well-organized nanoscale devices. Recently, such a strategy was found to be effective for TMDC and MXene nanosheets, expanding the lineup of functionalities of solution-processed 2D nanomaterial devices from dielectrics, optics, magnetics, and semiconductors to superconductors. Throughout this review, we share the historical research flow, recent progress, and prospects in the development of soft-chemical exfoliation, colloidal integration, and thin film applications of oxides, TMDC, and MXene nanosheets.
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Ali, Imran, Sara H. Althakfi, Mohammad Suhail, Marcello Locatelli, Ming-Fa Hsieh, Mosa Alsehli, and Ahmed M. Hameed. "Advances in Polymeric Colloids for Cancer Treatment." Polymers 14, no. 24 (December 13, 2022): 5445. http://dx.doi.org/10.3390/polym14245445.
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Polymer colloids have remarkable features and are gaining importance in many areas of research including medicinal science. Presently, the innovation of cancer drugs is at the top in the world. Polymer colloids have been used as drug delivery and diagnosis agents in cancer treatment. The polymer colloids may be of different types such as micelles, liposomes, emulsions, cationic carriers, and hydrogels. The current article describes the state-of-the-art polymer colloids for the treatment of cancer. The contents of this article are about the role of polymeric nanomaterials with special emphasis on the different types of colloidal materials and their applications in targeted cancer therapy including cancer diagnoses. In addition, attempts are made to discuss future perspectives. This article will be useful for academics, researchers, and regulatory authorities.
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Basina, Georgia, Hafsa Khurshid, Nikolaos Tzitzios, George Hadjipanayis, and Vasileios Tzitzios. "Facile Organometallic Synthesis of Fe-Based Nanomaterials by Hot Injection Reaction." Nanomaterials 11, no. 5 (April 28, 2021): 1141. http://dx.doi.org/10.3390/nano11051141.
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Fe-based colloids with a core/shell structure consisting of metallic iron and iron oxide were synthesized by a facile hot injection reaction of iron pentacarbonyl in a multi-surfactant mixture. The size of the colloidal particles was affected by the reaction temperature and the results demonstrated that their stability against complete oxidation related to their size. The crystal structure and the morphology were identified by powder X-ray diffraction and transmission electron microscopy, while the magnetic properties were studied at room temperature with a vibrating sample magnetometer. The injection temperature plays a very crucial role and higher temperatures enhance the stability and the resistance against oxidation. For the case of injection at 315 °C, the nanoparticles had around a 10 nm mean diameter and revealed 132 emu/g. Remarkably, a stable dispersion was created due to the colloids’ surface functionalization in a nonpolar solvent.
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Maillette, Sébastien, Caroline Peyrot, Tapas Purkait, Muhammad Iqbal, Jonathan G. C. Veinot, and Kevin J. Wilkinson. "Heteroagglomeration of nanosilver with colloidal SiO2 and clay." Environmental Chemistry 14, no. 1 (2017): 1. http://dx.doi.org/10.1071/en16070.
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Environmental contextThe fate of nanomaterials in the environment is related to their colloidal stability. Although numerous studies have examined their homoagglomeration, their low concentration and the presence of high concentrations of natural particles implies that heteroagglomeration rather than homoagglomeration is likely to occur under natural conditions. In this paper, two state-of-the art analytical techniques were used to identify the conditions under which nanosilver was most likely to form heteroagglomerates in natural waters. AbstractThe environmental risk of nanomaterials will depend on their persistence, mobility, toxicity and bioaccumulation. Each of these parameters is related to their fate (especially dissolution, agglomeration). The goal of this paper was to understand the heteroagglomeration of silver nanoparticles in natural waters. Two small silver nanoparticles (nAg, ~3nm; polyacrylic acid- and citrate-stabilised) were covalently labelled with a fluorescent dye and then mixed with colloidal silicon oxides (SiO2, ~18.5nm) or clays (~550nm SWy-2 montmorillonite). Homo- and heteroagglomeration of the nAg were first studied in controlled synthetic waters that were representative of natural fresh waters (50μg Ag L–1; pH 7.0; ionic strength 10–7 to 10–1 M Ca) by following the sizes of the nAg by fluorescence correlation spectroscopy. The polyacrylic acid-coated nanosilver was extremely stable under all conditions, including in the presence of other colloids and at high ionic strengths. However, the citrate-coated nanosilver formed heteroaggregates in presence of both colloidal SiO2 and clay particles. Nanoparticle surface properties appeared to play a key role in controlling the physicochemical stability of the nAg. For example, the polyacrylic acid stabilized nAg-remained extremely stable in the water column, even under conditions for which surrounding colloidal particles were agglomerating. Finally, enhanced dark-field microscopy was then used to further characterise the heteroagglomeration of a citrate-coated nAg with suspensions of colloidal clay, colloidal SiO2 or natural (river) water.
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Garino, Nadia, Tania Limongi, Bianca Dumontel, Marta Canta, Luisa Racca, Marco Laurenti, Micaela Castellino, Alberto Casu, Andrea Falqui, and Valentina Cauda. "A Microwave-Assisted Synthesis of Zinc Oxide Nanocrystals Finely Tuned for Biological Applications." Nanomaterials 9, no. 2 (February 6, 2019): 212. http://dx.doi.org/10.3390/nano9020212.
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Herein we report a novel, easy, fast and reliable microwave-assisted synthesis procedure for the preparation of colloidal zinc oxide nanocrystals (ZnO NCs) optimized for biological applications. ZnO NCs are also prepared by a conventional solvo-thermal approach and the properties of the two families of NCs are compared and discussed. All of the NCs are fully characterized in terms of morphological analysis, crystalline structure, chemical composition and optical properties, both as pristine nanomaterials or after amino-propyl group functionalization. Compared to the conventional approach, the novel microwave-derived ZnO NCs demonstrate outstanding colloidal stability in ethanol and water with long shelf-life. Furthermore, together with their more uniform size, shape and chemical surface properties, this long-term colloidal stability also contributes to the highly reproducible data in terms of biocompatibility. Actually, a significantly different biological behavior of the microwave-synthesized ZnO NCs is reported with respect to NCs prepared by the conventional synthesis procedure. In particular, consistent cytotoxicity and highly reproducible cell uptake toward KB cancer cells are measured with the use of microwave-synthesized ZnO NCs, in contrast to the non-reproducible and scattered data obtained with the conventionally-synthesized ones. Thus, we demonstrate how the synthetic route and, as a consequence, the control over all the nanomaterial properties are prominent points to be considered when dealing with the biological world for the achievement of reproducible and reliable results, and how the use of commercially-available and under-characterized nanomaterials should be discouraged in this view.
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Hupfeld, Tim, Frederic Stein, Stephan Barcikowski, Bilal Gökce, and Ulf Wiedwald. "Manipulation of the Size and Phase Composition of Yttrium Iron Garnet Nanoparticles by Pulsed Laser Post-Processing in Liquid." Molecules 25, no. 8 (April 17, 2020): 1869. http://dx.doi.org/10.3390/molecules25081869.
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Modification of the size and phase composition of magnetic oxide nanomaterials dispersed in liquids by laser synthesis and processing of colloids has high implications for applications in biomedicine, catalysis and for nanoparticle-polymer composites. Controlling these properties for ternary oxides, however, is challenging with typical additives like salts and ligands and can lead to unwanted byproducts and various phases. In our study, we demonstrate how additive-free pulsed laser post-processing (LPP) of colloidal yttrium iron oxide nanoparticles using high repetition rates and power at 355 nm laser wavelength can be used for phase transformation and phase purification of the garnet structure by variation of the laser fluence as well as the applied energy dose. Furthermore, LPP allows particle size modification between 5 nm (ps laser) and 20 nm (ns laser) and significant increase of the monodispersity. Resulting colloidal nanoparticles are investigated regarding their size, structure and temperature-dependent magnetic properties.
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Romolini, G., M. Gambucci, D. Ricciarelli, L. Tarpani, G. Zampini, and L. Latterini. "Photocatalytic activity of silica and silica-silver nanocolloids based on photo-induced formation of reactive oxygen species." Photochemical & Photobiological Sciences 20, no. 9 (August 27, 2021): 1161–72. http://dx.doi.org/10.1007/s43630-021-00089-9.
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AbstractSemiconductor nanomaterials are often proposed as photocatalysts for wastewater treatment; silica nanomaterials are still largely unexploited because their photocatalytic performances need improvements, especially under visible light. The present study is a proof-of-concept that amorphous silica colloids once submitted to the proper surface modifications change into an efficient photocatalyst even under low-energy illumination source. For this reason, silica-based colloidal nanomaterials, such as bare (SiO2 NPs), aminated (NH2-SiO2 NPs), and Ag NPs-decorated (Ag-SiO2 NPs) silica, are tested as photocatalysts for the degradation of 9-anthracenecarboxylic acid (9ACA), taken as a model aromatic compound. Interestingly, upon irradiation at 313 nm, NH2-SiO2 NPs induce 9ACA degradation, and the effect is even improved when Ag-SiO2 NPs are used. On the other hand, irradiation at 405 nm activates the plasmon of Ag-SiO2 NPs photocatalyst, providing a faster and more efficient photodegradation. The photodegradation experiments are also performed under white light illumination, employing a low-intensity fluorescent lamp, confirming satisfying efficiencies. The catalytic effect of SiO2-based nanoparticles is thought to originate from photo-excitable surface defects and Ag NP plasmons since the catalytic degradation takes place only when the 9ACA is adsorbed on the surface. In addition, the involvement of reactive oxygen species was demonstrated through a scavenger use, obtaining a yield of 17%. In conclusion, this work shows the applicability of silica-based nanoparticles as photocatalysts through the involvement of silica surface defects, confirming that the silica colloids can act as photocatalysts under irradiation with monochromatic and white light. Graphic abstract Silica and Ag-decorated silica colloids photosensitize the formation of Reactive Oxygen Species with 17% efficiencies. ROS are able to oxidase aromatic pollutants chemi-adsorbed on the surface of the colloids. Silica-silver nanocomposites present a photocatalytic activity useful to degrade aromatic compounds.
Dissertations / Theses on the topic "Colloidal Nanomaterisls"
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Souza, Caio Guilherme Secco de. "Nanomateriais luminomagnéticos visando aplicações biológicas: síntese, propriedades, funcionalização e estabilidade coloidal." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/75/75134/tde-11082015-090833/.
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Neste trabalho, foi realizado um estudo da obtenção de nanomateriais luminomagnéticos visando potenciais aplicações biológicas, a partir de dois diferentes tipos de estruturas, sendo elas: a formação de heteronanoestruturas luminomagnéticas de NPM de FePt/Fe3O4-CdSe recobertas com sílica; e a formação de nanomateriais luminomagnéticos por ligação covalente entre NPM de FePt/Fe3O4-Dopa-PIMA-PEG-NH2 e pontos quânticos de CdSe/ZnS-LA-PEG-COOH. Para o primeiro tipo de nanomaterial citado, foram testadas duas metodologias para obtenção das heteronanoestruturas: a mudança da estabilidade coloidal pela adição de pequenas quantidades de NaCl no meio contendo as NPM e os pontos quânticos previamente sintetizados; e o método de injeção a quente do precursor de selênio em um meio contendo as NPM como sementes, o precursor de cádmio e os agentes de superfície. O método de injeção a quente foi o que apresentou melhores condições para a formação das heteronanoestruturas. Para providenciar estabilidade coloidal em meio aquoso e superfície com biocompatibilidade, foi realizado o recobrimento com sílica na superfície das heteronanoestruturas luminomagnéticas com melhores condições. Para essa amostra, o tamanho médio obtido foi de 25,0 nm, com polidispersividade de 8,4 %, Ms = 11,1 emu.g-1 e comportamento superparamagnético, além de duas bandas de emissão (com excitação de 400 nm) centradas em 452 nm e 472 nm, respectivamente. Já para o segundo tipo de nanomaterial obtido neste trabalho, foram primeiramente obtidas NPM de FePt/Fe3O4 pelo método do poliol modificado acoplado à metodologia do crescimento, e pontos quânticos luminescentes de CdSe/ZnS pelo método de decomposição térmica de precursores organometálicos, sendo que ambas nanoestruturas apresentaram superfície hidrofóbica. Para a troca de ligantes para transferência das nanoestruturas para a fase aquosa e para providenciar biocompatibilidade visando aplicações biológicas, foram previamente preparados ligantes poliméricos de Dopa-PIMA-PEG-NH2 para recobrimento das NPM e de LA-PEG-COOH para recobrimento dos pontos quânticos. A conjugação química entre as nanoestruturas de FePt/Fe3O4-Dopa-PIMA-PEG-NH2 e CdSe/ZnS-LA-PEG-COOH foi realizada pelo método da carbodiimida em solução aquosa para a formação de uma ligação covalente amida entre os grupos amina e carboxilato em cada uma das nanoestruturas. Os nanomateriais luminomagnéticos obtidos apresentaram estabilidade coloidal em meio aquoso, com estreita distribuição de tamanho, apresentando RH de 79,96 nm, Ms de, aproximadamente, 10 emu.g-1 com coercividade e remanência quase nulos e intensa banda de emissão centrada em 580 nm. Espera-se que os nanomateriais obtidos neste trabalho possam ser promissores nanomateriais com propriedades multifuncionais para potenciais aplicações biológicas.Here, luminomagnetic nanomaterials were obtained for potential biological applications. We have studied two different types of luminomagnetic nanomaterials, which are: formation of silica-coated FePt/Fe3O4-CdSe heteronanostructures; and formation of luminomagnetic nanomaterials from covalent bond between FePt/Fe3O4-Dopa-PIMA-PEG-NH2 magnetic nanoparticles and CdSe/ZnS-LA-PEG-COOH luminescent quantum dots. For the first type of luminomagnetic nanomaterials obtained, two methodologies were studied for formation of heteronanostructures, which are: modification of colloidal stability by addition of small amounts of NaCl into a solution with hydrophobic magnetic nanoparticles and luminescent quantum dots; and hot injection method of selenium precursor into a solution with magnetic nanoparticles seeds, cadmium precursors and surface agents. The hot injection method obtained better results than the other method studied for formation of heteronanostructures. To provide colloidal stability in aqueous solution and biocompatibility, the heteronanostructures were coated using silica shell. After silica coating, the heteronanostructures showed average diameter of 25 nm and polidispersivity of 8.4%, with Ms = 11.1 emu.g-1 and superparamagnetic behavior. Moreover, these nanomaterials showed two emission peaks centered at 452 and 472 nm. For the second type of nanomaterials obtained, FePt/Fe3O4 magnetic nanoparticles were synthesized by modified polyol method coupled to seeded-mediated growth, and CdSe/ZnS luminescent quantum dots were obtained by thermal decomposition of organometallic precursors. For the ligand exchange to transfer the nanostructures from organic media to aqueous solution, were used Dopa-PIMA-PEG-NH2 and LA-PEG-COOH polymers to provide colloidal stability and biocompatibility on magnetic nanoparticle surface and quantum dot surface, respectively. The chemical conjugation between FePt/Fe3O4-Dopa-PIMA-PEG-NH2 and CdSe/ZnS-LA-PEG-COOH nanostructures was obtained by EDC coupling in aqueous solution, which linked amine and carboxylate groups in each nanostructure to provide the formation of amide bond. The luminomagnetic nanomaterials obtained showed colloidal stability in aqueous solution, narrow size distribution, with RH equal to 79.96 nm, MS around 10 emu.g-1 with low coercivity and remanent magnetization, and intense emission peak centered at 580 nm. We expect these luminomagnetic nanomaterials be promisor nanomaterials with multifunctional properties for potential biological applications.
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Khan, Saif A. "Microfluidic synthesis of colloidal nanomaterials." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/37223.
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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 2006.Includes bibliographical references.
This thesis focuses on microfluidics based approaches for synthesis and surface-engineering of colloidal particles. Bottom-up assembly through colloidal nucleation and growth is a popular route to the controlled synthesis of nanomaterials. Standard bench-scale synthetic chemistry techniques often involve non-uniform spatial and temporal distributions of concentration and temperature, and are not readily scalable. Photolithography-based microfabrication enables the application of classical techniques of chemical reaction engineering to design chemical reactors that cannot be realized easily at the macroscale, and that closely approach theoretical 'idealized' reactor configurations. In addition, the microfluidic format allows precisely controlled reaction conditions such as rapid mixing, and concentration and temperature uniformity. The goal of this thesis was to design microfluidic reactors for synthesis of core-shell colloidal particles with tunable sizes. Microscale segmented gas-liquid flows overcome the large axial dispersion effects associated with single-phase laminar flows. Microchannel devices that yielded uniform, stable gas-liquid segmented flows over three orders of magnitude in flow velocity were first developed.
(cont.) Extensive experimental studies of the transport, dynamics and stability of such flows were then conducted with pulsed-laser fluorescent microscopy, optical stereomicroscopy and micro particle image velocimetry (-PIV). Flow segmentation not only reduces axial dispersion, but also allows rapid micromixing of miscible liquids through internal recirculations in the liquid phase. This added functionality is especially useful in syntheses involving colloidal particles that, due to inherently low diffusivity, cannot be rapidly mixed by laminar diffusive techniques. Continuous segmented flow reactors were then developed for the synthesis of colloidal silica and titania particles by sol-gel chemistry. Particle sizes could be tuned by varying the rates of flow of reactants, or by varying the chip temperature. Particle size distributions comparable to or narrower than the corresponding stirred-flask synthesis, with little agglomeration or shape distortion were obtained. Coating of colloidal particles with one or more layers of different materials is used to modify their optical, chemical or surface properties. Core-shell particles are often prepared by controlled precipitation of inorganic precursors onto core particles.
(cont.) Synthesis of such structures requires precise control over process parameters to prevent precipitation of secondary particles of shell material and agglomeration of primary particles. Particles coated with titania are exceptionally difficult to synthesize due to the high reactivity of the titania precursors, which makes controlled precipitation difficult. A novel continuous flow microfluidic reactor with sequential multi-point precursor addition was developed for colloidal overcoating processes. Silica particles were coated with uniform titania layers of tunable thickness by the controlled hydrolysis of titanium ethoxide, with no secondary particle formation or agglomeration. An integrated reactor for continuous silica synthesis and in-situ series overcoating with titania was then developed using a two-level stacked reactor fabrication process. Finally, multi-step nanomaterials synthesis and surface coating with incompatible chemistries requires the development of microfluidic 'unit operations' equivalent to particle filtration. In this context, rapid, continuous microfluidic particle separation was demonstrated using transverse free-flow electrophoresis.
by Saif A. Khan.
Ph.D.
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Berestok, Taisiia. "Assembly of colloidal nanocrystals into porous nanomaterials." Doctoral thesis, Universitat de Barcelona, 2018. http://hdl.handle.net/10803/663275.
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This thesis focuses on different aspects of NCs colloidal synthesis, the exploration of the relevant surface chemistries that afford NC assembly and the NC implementation into porous nanomaterials.
The work is divided into two blocks. The first block is devoted to developing and optimizing the synthesis of NCs followed by the examination of their suitability for potential applications in catalysis and photocatalysis. The second block is dedicated to establish procedures to fabricate single-component or multicomponent porous nanomaterials from NC building blocks. To embrace the use of the developed strategies in different application fields, several kind of materials were under research. Namely, metals (e.g. Au), metal oxides (e.g. CeO2, TiO2, Fe2O3), metal chalcogenides (e.g. In2S3, ZnS, PbS, CuGaS2 and Cu2ZnSnSe4), and their composites.
CeO2 NCs synthesis was deeply investigated with the aim to achieve a proper control on the NCs morphology, facets exposed, crystal phase, composition, etc., required for application. Overall, CeO2 NCs with spherical, octapod-like branched, cubic hyperbranched, and kite-like morphology with sizes in the range 7 to 45 nm were produced by adjusting experimental conditions of the synthetic protocol. Branched and hyperbranched NCs showed higher surface areas, porosities and oxygen capacity storage values compared to quasi-spherical NCs.
The NCs morphology-controlled synthesis has been extended to quaternary Cu2ZnSnSe4 (CZTSe). CZTSe NCs with narrow size distribution and controlled composition were produced. It was shown how off-stoichiometric CZTSe compositions were characterized by higher charge carrier concentrations and thus electrical conductivities.
The strategy to functionalize the metal oxide NC surface composition by applying different ligands is proposed. This enables to develop a novel approach to assemble metal oxide NCs into porous gel and aerogel structures. Propylene oxide has been found to trigger the gelation process of glutamine functionalized NCs. The detailed investigation of the gelation mechanism is demonstrated for the case of ceria. The method is applied for NCs with different morphologies. Eventually, the versatility of the concept is proved by using of the proposed approach for the TiO2 and Fe2O3 nanocrystals.
The assembly method has been extended to metal chalcogenides - In2S3 NCs - starting from the NCs synthesis, with further surface chemistry manipulation and eventually follows by the NC assembly into gels and aerogels. The optimization of NC surface chemistry was achieved by testing different ligand exchange approaches via applying short-chain organic and inorganic ligands. The assembly method based on ligand desorption from the NC surface and chalcogenide-chalcogenide bond formation has been established for In2S3. The comparison of the different ligands impact on the NC performance in colloidal form, when assembled into gels and when supported onto substrate is investigated towards photoelectrocatalysis.
The oxidative ligand desorption assembly approach has been extended for multicomponent NCs for the case of CuGaS2 and CuGaS2-ZnS. Optimization of spin-coating process of the formed NCs inks followed by applying of sol-gel chemistry led to formation of highly porous layers from TGA-CuGaS2 and TGA-ZnS. Applied results of CuGaS2/ZnS nanocrystal-based bilayers and CuGaS2–ZnS nanocrystal-based composite layers have been shown by testing their photoelectrochemical energy conversion capabilities.
The approach to adjust NC surface chemistry has been proposed and tested for performing multicomponent NC assemblies. Applying of different ligands for NC surface functionalization endows their surface with different charges which usually provides colloidal NCs stabilization. It has been found that mixing of oppositely
charged NCs with certain concentration enabled their assembly/gelation via electrostatic interaction. The proposed approach has been applied and optimized to produce multicomponent NC gels and aerogels. The detailed investigation of the gelation mechanism is shown for combination of metal-metal oxide and metal oxide-metal chalcogenide NCs (Au-CeO2, CeO2-PbS). Applied results of the Au-CeO2 aerogels were demonstrated for CO-oxidation.Esta tesis se centra en la síntesis coloidal de nanocristales (NCs), en la exploración de su química de superficie y en su ensabanado en nanomateriales porosos funcionales. Para demostrar la versatilidad de aplicación de dichas estructuras, en este estudio se han considerado NCs de distintos tipos de materiales: metales (Au), óxidos metálicos (CeO2, TiO2, Fe2O3), calcogenuros metálicos (In2S3, ZnS, PbS, CuGaS2,Cu2ZnSnSe4) y sus materiales compuestos. El trabajo se dividió en dos bloques. En el primero se desarrolló y optimizó la síntesis de NCs de óxidos y calcogenuros metálicos y se evaluó su potencial para aplicaciones de catálisis y fotocatálisis. Se investigó en profundidad la síntesis de NCs de CeO2, poniendo énfasis en controlar su morfología. Se consiguió producir NCs de CeO2 de forma controlada (esférica, octapodo ramificado, cúbico ramificado y romboidal) y con tamaño controlado (7-45 nm). Asimismo, se obtuvieron NCs de Cu2ZnSnSe4 con una fina distribución de tamaños y composición controlada. En el segundo bloque se establecieron y estudiaron procedimientos para fabricar nanomateriales porosos mono- o multicomponentes a partir del ensamblado de NCs. Se desarrolló una estrategia basada en el ajuste de la química de superficie de NCs de óxidos metálicos (CeO2, Fe2O3,TiO2) y de calcogenuros metálicos (In2S3, CuGaS2-ZnS) que permitió su ensamblaje controlado en estructuras porosas de tipo gel y aerogel. En el caso de los óxidos metálicos, se determinó que el ensamblado se inicia con la adición de un epóxido a NCs funcionalizados con glutamina, causando la gelación. La desorción oxidativa de ligandos basada en la formación de enlaces calcogenuro-calcogenuro se propuso como mecanismo de gelación en calcogenuros mono- (In2S3) y multicomponente (CuGaS2-ZnS). Se investigó el impacto del empleo de distintos ligandos en la eficiencia foto-electrocatalítica de NCs en forma coloidal, ensamblados en geles y soportados en sustratos. Se desarrolló y estudió el ajuste de la química de superficie de NCs para la obtención de ensamblajes multicomponente mediante interacción electrostática de coloides en suspensión. El mecanismo de gelación fue investigado al detalle para materiales compuestos de NCs de oxido metálico (CeO2) con NCs de óxido de calcogenuro (PbS-CeO2) y metálicos (Au-CeO2). Los aerogeles de Au-CeO2 demostraron potencial para la oxidación de CO.
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Torres, Mendieta Rafael Omar. "Synthesis of colloidal nanomaterials through femtosecond laser ablation." Doctoral thesis, Universitat Jaume I, 2016. http://hdl.handle.net/10803/387325.
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La investigación de esta tesis se centra en la producción de nanoestructuras metálicas dentro de aceites orgánicos y nano-ensambles por ablación láser en líquidos para resolver los mayores problemas en su producción por métodos convencionales: poca estabilidad, producción de residuos químicos y reacciones químicas sin control debido a problemas de pureza. En particular, las mayores contribuciones son, la síntesis de nanofluidos basados en nanopartículas de oro que pueden ser utilizados como absorbentes volumétricos de luz e intercambiadores de calor. La fabricación de un nanofluido con una mejora de conductividad térmica de 4,06% sobre un fluido de transferencia de calor comercial, una mezcla eutéctica de óxido de bifenilo y difenilo, y la mejor estabilidad coloidal reportada en la literatura usando estos materiales. Y, por último, la demostración de la reducción parcial de láminas de óxido de grafeno y su decoración con nanopartículas de oro con ligandos libres, en un solo paso.The research conducted during this thesis work is focused on producing metal nanostructures inside organic oils and nano-essambles by Pulsed Laser Ablation in Liquids (PLAL) to solve the biggest issues on their production by conventional approaches: Poor stability, production of chemical waste and uncontrolled chemical reactions due to purity problems. In particular, the biggest contributions achieved on the present work, lies on the experimental demonstration of the synthesis of gold nanoparticles-based aqueous nanofluids that can be used as both volumetric light absorbers and heat exchangers. The fabrication of a nanofluid with a thermal conductivity enhancement of 4.06% over a commercial heat transfer fluid, an eutectic mixture of biphenyl and diphenyl oxide, and the best colloidal stability reported in the literature using these materials. And finally, demonstration of partial reduction of graphene-oxide sheets and its decoration with ligand-free gold nanoparticles, in a single reaction stage avoiding the production of chemical waste.
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Jiang, Zhoufeng Jiang. "Zero-dimensional and two-dimensional colloidal nanomaterials and their photophysics." Bowling Green State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1522964027555741.
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Batsmanova, L. M., L. M. Gonchar, N. Yu Taran, and A. A. Okanenko. "Using a Colloidal Solution of Metal Nanoparticles as Micronutrient Fertiliser for Cereals." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35441.
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We have developed the technology of using the colloidal solution of metal nanoparticles as fertilizers, which characterized by easiness to use, environmental safety and absence of corrosive properties. Colloidal solutions of biogenic metals, water-based, such as Fe, Mn, Zn, Mo, Co, Cu, and Ag, produced by a patented method of bittern natural colloidal solutions of the above metals were used. Seed treatment with colloidal solution of metal nanoparticles stored genetic purity grade, increased plant immune status via regulation of oxidative metabolism, photosynthetic activity, resistance to pathogens, and optimization of water regime of various winter wheat ecotypes during ontogenesis. Results of industrial tests proved that it is environ-mentally safe and economically feasible, since the cost of one liter of colloidal solutions of nanoparticles of metals ranges from 50-70 USD providing 500% level profitability. So, for the first time managed to opti-mize the function of biogenic metals through the use of physical and chemical characteristics of colloidal nanoparticle solutions to realize the productive potential of plants.
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Huba, Zachary. "Synthesis and characterization of cobalt carbide based nanomaterials." VCU Scholars Compass, 2014. http://scholarscompass.vcu.edu/etd/3320.
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Permanent magnets are used heavily for multiple applications in industry and current electronic technologies. However, the current permanent landscape is muddled by high cost of materials and insufficient magnetic or thermal properties. The primary focus of this dissertation work is the synthesis and optimization of a new permanent magnetic material, in the form of cobalt carbide nanomaterials. The optimization revolved around controlling the crystal phase and particle shape of synthesized cobalt carbide particles; these parameters have significant impact on the observed magnetic properties of magnetic nanoparticles. Co3C was identified to be the preferred crystal phase, leading to better magnetic properties. Cobalt Fumarate was found to be the ideal precursor to synthesize anisotropic Co3C particles and enhance magnetic properties of the synthesized cobalt carbide particles. Lastly, an ethanol based reduction system was employed to develop the greener synthesis of Co and Ni magnetic particles.
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Ibáñez, Sabaté Maria. "Functional Nanomaterials from the Bottom-up Assembly of Colloidal Nanoparticles. A Strategy Towards Efficient Thermoelectrics." Doctoral thesis, Universitat de Barcelona, 2013. http://hdl.handle.net/10803/307536.
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The work developed during this PhD has embraced several topics that I divide in three blocks. Each block contains two chapters in this dissertation. Additionally, a general introduction of the different topics is provided (Chapter 1). The first block corresponds to the study of colloidal synthetic routes to produce functional nanoparticles (Chapter 2 and 3). In the second block the developed nanoparticles are used to produce bulk nanostructured materials. The functional properties of the nanomaterials are also characterized in this second block. As the paradigmatic application for such bottom-up assembled nanostructured materials I considered thermoelectricity (Chapter 4 and 5). In the last block, I go one step beyond and design and prepare multiphase nanoparticles as building blocks for the bottom up production of nanocomposites with improved thermoelectric performance (Chapter 6 and 7).El treball desenvolupat durant aquesta tesi doctoral engloba diverses temàtiques que s’han dividit en tres blocs. Cada bloc conté dos capítols. A més a més, com a Capítol 1 s’ha inclòs una introducció general de cadascuna de les temàtiques tractades. En el primer bloc, Capítols 2 i 3, s’estudien diferents síntesis col·loïdals per produir nanopartícules funcionals. En el segon bloc, Capítols 4 i 5, les nanopartícules desenvolupades s'utilitzen per produir materials nanoestructurats en bulk a partir del seu assemblatge. Les propietats funcionals d’aquests nanomaterials es caracteritzen també en aquest segon bloc. Com a aplicació paradigmàtica s’ha considerat la termoelectricitat. En l'últim bloc, Capítols 6 i 7, es va un pas més enllà i es dissenyen nanopartícules heterogènies com blocs de construcció per a la producció de nanocompostos amb millor rendiment termoelèctic.
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Suárez, García Salvio. "Colloidal coordination polymer nanostructures: novel thermochromic and bioimaging probes." Doctoral thesis, Universitat Autònoma de Barcelona, 2019. http://hdl.handle.net/10803/669764.
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Los polímeros de coordinación y su diseño racional permiten la formación de materiales nanoestructurados con una amplia variedad de propiedades. Las múltiples combinaciones entre iones metálicos y ligandos orgánicos como precursores de materiales autoensamblados, han fascinado a los científicos durante décadas. La aplicación de la química de coordinación a nanoescala se considera uno de los enfoques más versátiles para el desarrollo de nuevos materiales nanoestructurados debido a las infinitas posibilidades para alcanzar propiedades sin precedentes. Además, el desarrollo de sistemas metal-orgánicos ha despertado en una gran cantidad de ejemplos para su uso en una amplia gama de aplicaciones.
En esta Tesis hemos estado particularmente interesados en el ajuste controlado de las propiedades de los materiales nanoestructurados basados en polímeros de coordinación que se obtuvieron a través de diferentes rutas sintéticas. El método de síntesis, la selección adecuada de precursores y el estudio de las propiedades finales han centrado el trabajo realizado. Además, la formación de suspensiones coloidales estables en agua se estableció como un requisito principal para su potencial aplicación. Para eso, fue necesaria una sinergia multidisciplinaria con el objetivo de buscar la aplicación final de los nuevos materiales nanoestructurados desarrollados. El logro de este objetivo fue posible gracias a un diseño adecuado de la estrategia seguida junto con la caracterización completa de las nanoestructuras preparadas.
En una primera parte de esta Tesis, la nanoestructuración de sistemas conmutables basados en Fe(II) con comportamiento de entrecruzamiento de espín (SCO por sus siglas en inglés) se logró siguiendo dos estrategias diferentes. Por un lado, se aplicó una metodología descendente (top-down) basada en la exfoliación en fase líquida para el aislamiento de láminas 2D de cristales multilaminares. Por otro lado, a través de un enfoque ascendente (bottom-up), la síntesis de nuevas nanopartículas fue posible modulando la difusión de la reacción utilizando metodologías basadas en microfluidica. En ambos casos, los materiales nanoestructurados se integraron en matrices poliméricas para evaluar su aplicación potencial como películas termocrómicas para su prueba de concepto. En la segunda parte de la Tesis, se estableció una nueva familia de polímeros de coordinación a nanoescala (NCP por sus siglas en inglés) basados en Fe(III), Gd(III), Mn(II), In(III) y Cu(II) a través de su síntesis racional usando una reacción en un sola etapa. Las nanopartículas obtenidas se validaron mediante pruebas preclínicas in vivo que muestran un rendimiento interesante como posibles agentes teranósticos para la obtención de imágenes (resonancia magnética, tomografía por emisión de positrones y tomografía computarizada por emisión de fotón único) y pretratamiento potencial de glioblastoma y enfermedades pulmonares.Coordination polymers and its rational design let the formation of nanostructured materials with a broad variety of properties. The multiple combinations between metal ions and organic ligands as precursors of self-assembled materials have fascinated scientists for decades. The application of coordination chemistry at the nanoscale is considered one of the most versatile approaches for the development of new nanostructured materials due to the infinite possibilities for reaching unprecedented properties. Furthermore, the development of metal-organic systems has aroused in a plethora of examples for their use in a wide range of applications. In this Thesis we have been particularly interested in the fine tune of the properties of nanostructured materials based on coordination polymers whose were obtained through different synthetic routes. The method of synthesis, the properly selection of precursors and the study of the final properties has centred the work carried out. Additionally, the formation of water-stable colloidal suspensions was stablished as a main requirement for their potential application. For that, a multidisciplinary synergy was necessary with the aim to pursue the final application of the novel nanostructured materials developed. Achieving this objective was possible thanks to a properly design of the strategy followed together with complete characterization of the nanostructures prepared. In a first part of this Thesis, the nanostructuration of Fe(II)-based switchable systems with spin crossover behaviour was achieved by following two different strategies. On the one hand, a top-down methodology based on liquid-phase exfoliation was applied for the isolation of 2D flakes from the bulk crystal. On the other hand, through a bottom-up approach, the synthesis of novel nanoparticles was possible by modulating the reaction diffusion using microfluidic based methodologies. In both cases, the nanostructured materials were integrated in polymeric matrices to evaluate their potential application as proof-of-concept thermochromic films. In the second part of the Thesis, a novel family of nanoscale coordination polymers (NCPs) based on Fe(III), Gd(III), Mn(II), In(III) and Cu(II) was stablished through its rational synthesis by using one-pot reaction. The nanoparticles obtained were validated by pre-clinical in vivo tests showing interesting performance as potential theranostic agents for imaging (Magnetic resonance imaging, positron emission tomography and single-photon emission computed tomography) and potential pre-treatment of glioblastoma and lung diseases.
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Cheng, Cheng. "Semiconductor colloidal quantum dots for photovoltaic applications." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:07baccd0-2098-4306-8a9a-49160ec6a15a.
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This thesis studies lead suphide (PbS) colloidal quantum dots and their photovoltaic applications. Different sizes of PbS QDs were synthesised and characterised using absorption spectroscopy and transmission electron microscopes. PbS QD Schottky junction devices were fabricated with AM1.5 power conversion efficiency up to 1.8 %. The Schottky junction geometry limits the device performance. A semiconductor heterojunction using ZnO as an electron acceptor was built and the device efficiency increased to 3%. By studying the light absorption and charge extraction profile of the bilayer device, the absorber layer has a charge extraction dead zone which is beyond the reach of the built-in electric field. Therefore, strategies to create a QD bulk heterojunction were considered to address this issue by distributing the junction interface throughout the absorber layer. However, the charge separation mechanism of the QD heterojunction is not clearly understood: whether it operates as an excitonic or a depleted p-n junction, as the junction operating mechanism determines the scale of phase separation in the bulk morphology. This study shows a transitional behaviour of the PbS/ZnO heterojunction from excitonic to depletion by increasing the doping density of ZnO. To utilise the excitonic mechanism, a PbS/ZnO nanocrystal bulk heterojunction was created by blending the two nanocrystals in solution such that a large interface between the two materials could facilitate fast exciton dissociation. However, the devices show poor performance due to a coarse morphology and formation of germinate pairs. To create a bulk heterojunction where a built-in electric field could assist the charge separation, a TiO2 porous structure with the pore size matching with the depletion width was fabricated and successfully in-filled by PbS QDs. The porous device produces 5.7% power conversion efficiency, among one of the highest in literature. The enhancement comes from increased light absorption and suppression of charge recombination.
Books on the topic "Colloidal Nanomaterisls"
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1935-, Nguyên Trong Anh, ed. Molecular chemistry of sol-gel derived nanomaterials. Chichester: Wiley, 2009.
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Corriu, Robert. Molecular chemistry of sol-gel derived nanomaterials. Chichester: Wiley, 2009.
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Grumezescu, Alexandru Mihai, and Alina-Maria Holban. Materials for Biomedical Engineering: Nanomaterials-Based Drug Delivery. Elsevier, 2019.
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Anh, Nguyen Trong, and Robert Corriu. Molecular Chemistry of Sol-Gel Derived Nanomaterials. Wiley & Sons, Incorporated, John, 2009.
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Anh, Nguyen Trong, and Robert Corriu. Molecular Chemistry of Sol-Gel Derived Nanomaterials. Wiley & Sons, Limited, John, 2009.
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Grumezescu, Alexandru Mihai. Materials for Biomedical Engineering: Nanomaterials-Based Drug Delivery. Elsevier, 2019.
Find full textBook chapters on the topic "Colloidal Nanomaterisls"
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Ingert, D. "Colloidal Methods and Shape Anisotropy." In Nanomaterials and Nanochemistry, 441–54. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-72993-8_18.
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Sugimoto, Hiroshi, and Minoru Fujii. "Near-infrared luminescent colloidal silicon nanocrystals." In Silicon Nanomaterials Sourcebook, 399–412. Boca Raton, FL: CRC Press, Taylor & Francis Group, [2017] | Series: Series in materials science and engineering: CRC Press, 2017. http://dx.doi.org/10.4324/9781315153544-19.
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Emin, Saim M., Alexandre Loukanov, Surya P. Singh, Seiichiro Nakabayashi, and Liyuan Han. "Synthesis, Characterization, and Self-assembly of Colloidal Quantum Dots." In Intelligent Nanomaterials, 1–37. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118311974.ch1.
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Pemble, Martyn E., and Maria Bardosova. "Colloidal Photonic Crystal Architectures for Advanced Light Management Applications." In Nanomaterials and Nanoarchitectures, 119–49. Dordrecht: Springer Netherlands, 2015. http://dx.doi.org/10.1007/978-94-017-9921-8_6.
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Podaru, George, and Viktor Chikan. "CHAPTER 1. Magnetism in Nanomaterials: Heat and Force from Colloidal Magnetic Particles." In Magnetic Nanomaterials, 1–24. Cambridge: Royal Society of Chemistry, 2017. http://dx.doi.org/10.1039/9781788010375-00001.
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Fudouzi, Hiroshi. "Colloidal Photonic Crystal Films: Fabrication and Tunable Structural Color and Applications." In Nanomaterials and Nanoarchitectures, 1–19. Dordrecht: Springer Netherlands, 2015. http://dx.doi.org/10.1007/978-94-017-9921-8_1.
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Soosaimanickam, Ananthakumar, Paulraj Manidurai, Saravanan Krishna Sundaram, and Moorthy Babu Sridharan. "Advancements and Challenges in Synthesizing Colloidal Semiconductor Nanocrystals by Hot-Injection Method." In Smart Nanomaterials Technology, 143–79. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-4149-0_8.
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Pfeiffer, Christian, Wolfgang J. Parak, and Jose Maria Montenegro. "Synthesis of Colloidal Gold and Silver Nanoparticles and their Properties." In Bio- and Bioinspired Nanomaterials, 1–22. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2014. http://dx.doi.org/10.1002/9783527675821.ch01.
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Okubo, Masayoshi. "Polymer Colloids with Focus on Nonspherical Particles." In Encyclopedia of Polymeric Nanomaterials, 1–9. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-36199-9_154-1.
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Okubo, Masayoshi. "Polymer Colloids with Focus on Nonspherical Particles." In Encyclopedia of Polymeric Nanomaterials, 1871–78. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-642-29648-2_154.
Full textConference papers on the topic "Colloidal Nanomaterisls"
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Romain, Mélanie, Amira Mahmoud, Julien Boudon, Rafik Ben Chaabane, Wilfrid Boireau, and Nadine Millot. "Engineered inorganic nanomaterials for biomedical and biosensing applications." In Colloidal Nanoparticles for Biomedical Applications XVIII, edited by Marek Osiński and Antonios G. Kanaras. SPIE, 2023. http://dx.doi.org/10.1117/12.2648338.
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Schneider, Joel P., Hedi Mattoussi, Anshika Kapur, Wentao Wang, Juan Diaz Hernandez, and Scott Medina. "Anti-microbial peptide facilitated cytosolic delivery of metallic gold nanomaterials." In Colloidal Nanoparticles for Biomedical Applications XIII, edited by Xing-Jie Liang, Wolfgang J. Parak, and Marek Osiński. SPIE, 2018. http://dx.doi.org/10.1117/12.2285661.
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Galatopoulos, Fedros, Paris Papagiorgis, Alexandra Chrusou, Caterina Bernasconi, Constantinos Christodoulou, Maryna Bodnarchuk, Maksym Kovalenko, Grigorios Itskos, and Stelios Choulis. "Colloidal Perovskite Nanomaterials Processing and Photovoltaic Loss Analysis." In nanoGe Spring Meeting 2022. València: Fundació Scito, 2022. http://dx.doi.org/10.29363/nanoge.nsm.2022.368.
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Klinke, Christian. "Synthesis and Optoelectronic Properties of Two-dimensional Colloidal Nanomaterials." In nanoGe Fall Meeting 2019. València: Fundació Scito, 2019. http://dx.doi.org/10.29363/nanoge.ngfm.2019.026.
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Klinke, Christian. "Synthesis and Optoelectronic Properties of Two-dimensional Colloidal Nanomaterials." In nanoGe Fall Meeting 2019. València: Fundació Scito, 2019. http://dx.doi.org/10.29363/nanoge.nfm.2019.026.
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Ghamari, Mohsen, and Ahmed Aboalhamayie. "Thermal Conductivity of Colloidal Suspensions of Jet Fuel and Carbon-Based Nanoparticles and its Effect on Evaporation Rate." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-88618.
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Recent studies have shown that addition of nano-sized particles to liquid fuels could significantly enhance major combustion characteristics such as burning rate and ignition delay. Colloidal suspensions are known to have enhanced optical properties and thermal conductivity compared to neat liquids; however, in the case of colloidal fuels, the main mechanism responsible for such enhanced properties is not well understood. To better understand these phenomena, colloidal suspensions of jet fuel and different types of carbon-based nanomaterials (carbon nanoparticles, multi-walled carbon nanotubes, and graphene nanoplatelets) prepared at different particle loadings were experimentally tested for their thermal conductivities. Colloidal suspensions of nanotubes showed higher conductivity compared to that of graphene and nanoparticle. This could justify higher burning rate of these fuels. Furthermore, and to differentiate between the effects of thermal conduction and radiation, droplet evaporations tests were carried out on colloidal suspensions of carbon nanoparticle under forced convection and in the absence of any radiation source. It was found that the presence of nanoparticle in jet fuel initially increases evaporation rate. However, a reduction in evaporation rate was observed at higher concentration as a result of particles agglomeration.
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Andre, Pascal, Ge Cheng, Wuzong Zhou, Ross A. Blackley, Ifor D. W. Samuel, and David Cole-Hamilton. "Colloidal synthesis of indium nitride nanoparticles." In Nanoepitaxy: Homo- and Heterogeneous Synthesis, Characterization, and Device Integration of Nanomaterials. SPIE, 2009. http://dx.doi.org/10.1117/12.826310.
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Hill, Eric. "Synthesis of Semiconductors Confined in Nanoscopic Colloidal Templates toward Heterostructured Nanomaterials." In Internet NanoGe Conference on Nanocrystals. València: Fundació Scito, 2021. http://dx.doi.org/10.29363/nanoge.incnc.2021.008.
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Zheng, Yuebing. "Colloidal Nanomaterials: From Single-nanoparticle Study to Directed Assembly of Superstructures." In Novel Optical Materials and Applications. Washington, D.C.: OSA, 2017. http://dx.doi.org/10.1364/noma.2017.notu2c.2.
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Guyot-Sionnest, Philippe. "Surface gating of colloidal semiconductor quantum dots to optimize mid-infrared detection and emission (Conference Presentation)." In Physical Chemistry of Interfaces and Nanomaterials XV, edited by Artem A. Bakulin, Natalie Banerji, and Robert Lovrincic. SPIE, 2016. http://dx.doi.org/10.1117/12.2236219.
Full textReports on the topic "Colloidal Nanomaterisls"
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Dawood, Farah. Synthesis and Lithography of Colloidal Nanomaterials. Office of Scientific and Technical Information (OSTI), November 2014. http://dx.doi.org/10.2172/1163626.
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