Relevant bibliographies by topics / Nanoparticles - Functional Properties

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

Academic literature on the topic 'Nanoparticles - Functional Properties'

Author: Grafiati
Published: 4 June 2021
Last updated: 7 September 2023

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Journal articles on the topic "Nanoparticles - Functional Properties"

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Reijnders, L. "Safe Functional Modified CuO Nanoparticles?" Applied Sciences 13, no. 6 (March 8, 2023): 3425. http://dx.doi.org/10.3390/app13063425.

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CuO nanoparticles produced by methods from inorganic chemistry and physics are applied as biocides and applications thereof in solar stills, solar collectors, catalysis, sensing and diesel fuels have been proposed. Such CuO nanoparticles are hazardous due to the release of Cu ions and the induced generation of reactive oxygen species after uptake by organisms. Nanoparticle hazard may be reduced by surface modification (coating or capping) and doping which reduces the release of Cu ions and the generation of reactive oxygen species. None of the published safe-by-design modifications of CuO nanoparticles that will be discussed here have been proven safe (no risk). By targeting the release of Cu ions and the generation of reactive oxygen species by CuO nanoparticles, safe(r)-by-design studies target properties that underly the biocidal functionality of CuO nanoparticles. Other functionalities of CuO nanoparticles may also be impacted. There is a case for complementing safe(r)-by-design studies by investigating the impact of the modifications studied on CuO nanoparticle functionality.
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Abd El-Aziz, Eman, Menna Zayed, Amina L. Mohamed, and Ahmed G. Hassabo. "Enhancement of the Functional Performance of Cotton and Polyester Fabrics upon Treatment with Polymeric Materials Having Different Functional Groups in the Presence of Different Metal Nanoparticles." Polymers 15, no. 14 (July 14, 2023): 3047. http://dx.doi.org/10.3390/polym15143047.

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This work examined the functional properties of three different treated fabrics, cotton, polyester, and cotton/polyester, with different polymeric materials (polyvinyl alcohol (PVA), carboxymethyl cellulose (CMC), or chitosan) in the presence and absence of two synthesized metal nanoparticles to impart and enhance fabric properties. Both metal nanoparticles (silver nanoparticle (AgNPs) and Zinc oxide nanoparticles (ZnONPs)) were synthesized using Psidium guajava Leaves and characterized using different techniques. The different treated fabrics were dyed with Reactive Dye (Syozol red k-3BS) and evaluated for their color strength, fastness properties, ultraviolet protection, antimicrobial activity, and mechanical properties. Results showed that treatment with polyvinyl alcohol (PVA), carboxymethyl cellulose (CMC), or chitosan enhances the functionality of all fabrics, with improved color strength, UV protection, and antimicrobial properties. Additionally, mechanical properties were slightly increased due to the creation of a thin film on the fabric surface. All dyed treated fabrics showed good ultraviolet protection and antimicrobial properties. The K/S of all treated textiles including nanoparticles and polymers was marginally greater than that of the treated materials without polymers. The UPF values demonstrate that the three investigated polymers and both metal nanoparticles enhance the fabrics’ ability to block UV radiation and shield people’s skin from its damaging effects. All treated textiles had UPF values that are higher than those of untreated textiles. Further research demonstrates that ZnONP-treated textiles exhibited greater UPF values than AgNP-treated textiles when the polymer component was present. Antibacterial examination demonstrated that treated materials had robust microbial resistance. This resistance is diminished by washing, but still prevents bacterial growth more effectively than untreated textiles.
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Wang, Yung-Chen, Eric Yi-Tong Chen, Chi-Shuo Chen, Albert Sun, and Wei-Chun Chin. "Mucus Rheological Properties Altered by Functional Nanoparticles." Biophysical Journal 98, no. 3 (January 2010): 401a. http://dx.doi.org/10.1016/j.bpj.2009.12.2163.

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Yang, Zhang-You, Sheng-Lin Luo, Hong Li, Shi-Wu Dong, Jian He, Hong Jiang, Rong Li, and Xiao-Chao Yang. "Alendronate as a robust anchor for ceria nanoparticle surface coating: facile binding and improved biological properties." RSC Adv. 4, no. 104 (2014): 59965–69. http://dx.doi.org/10.1039/c4ra12007h.

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Minh, Nguyen Viet, Vu Ngoc Tuoc, and Le Thi Hong Lien. "Density Functional Based Tight Binding Study on Wurtzite ZnO Prismatic Nanoparticles." Communications in Physics 21, no. 3 (September 19, 2011): 235. http://dx.doi.org/10.15625/0868-3166/21/3/173.

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We have performed the Density Functional Tight Binding (DFTB) study on the structural properties of Zinc Oxide Nanoparticles (NP), focusing on the effects induced by the surfaces and quantum size effect. Effects of surface relaxation and surface stress which is absent in atomistic model are taken carefully into account. The studying Nanoparticle size range up to 2.3nm. We illustrated the structural properties changes by decreasing NP sizes while the typical length of surface relaxation (about 1nm) remain unchanged and comparable with the particle size. The NP electronic properties, i.e. Density of State (DOS), charge transfer in hetero-bond also showed the deviation from bulk material value.
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Levratovsky, Y., and E. Gross. "High spatial resolution mapping of chemically-active self-assembled N-heterocyclic carbenes on Pt nanoparticles." Faraday Discussions 188 (2016): 345–53. http://dx.doi.org/10.1039/c5fd00194c.

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The properties of many functional materials critically depend on the spatial distribution of surface active sites. In the case of solid catalysts, the geometric and electronic properties of different surface sites will directly impact their catalytic properties. However, the detection of catalytic sites at the single nanoparticle level cannot be easily achieved and most spectroscopic measurements are performed with ensemble-based measurements in which the reactivity is averaged over millions of nanoparticles. It is hereby demonstrated that chemically-functionalized N-heterocyclic carbene molecules can be attached to the surfaces of Pt nanoparticles and utilized as a model system for studying catalytic reactions on single metallic nanoparticles. The formation of a carbene self-assembled layer on the surface of a Pt nanoparticle and its stability under oxidizing conditions were investigated. IR nanospectroscopy measurements detected the chemical properties of surface-anchored molecules on single nanoparticles. A direct correlation was identified between IR nanospectroscopy measurements and macroscopic ATR-IR measurements. These results demonstrate that high spatial resolution mapping of the catalytic reactivity on single nanoparticles can be achieved with this approach.
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Chiew, Cerwyn, Maria J. Morris, and Mohammad H. Malakooti. "Functional liquid metal nanoparticles: synthesis and applications." Materials Advances 2, no. 24 (2021): 7799–819. http://dx.doi.org/10.1039/d1ma00789k.

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Sonication and mechanical shearing are scalable processes for creating liquid metal nanoparticles. Optimizing the involved processing parameters is crucial for achieving the desirable structure, surface properties and applications of these nanoparticles.
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Song, Xiaolei, Congzhu Xu, Wendong Yao, Jieyun Wen, Qufu Wei, Yonggui Li, and Xinqun Feng. "Study on the Controllable Preparation of Nd3+ Doped in Fe3O4 Nanoparticles for Magnetic Protective Fabrics." Molecules 28, no. 7 (April 3, 2023): 3175. http://dx.doi.org/10.3390/molecules28073175.

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Magnetic protective fabrics with fine wearability and great protective properties are highly desirable for aerospace, national defense, and wearable protective applications. The study of the controllable preparation method of Nd3+ doped in Fe3O4 nanoparticles with supposed magnetic properties remains a challenge. The characterization of the microstructure, elemental composition, and magnetic properties of NdFe2O4 nanoparticles was verified. Then, the surface of NdFe2O4 was treated with glyceric acid to provide sufficient –OH. Subsequently, the connection of the nanoparticle by the succinimide group was studied and then grafted onto cotton fabrics as its bridging effect. The optimal loading rate of the functional fabrics with nanoparticles of an average size of 230 nm was 1.37% after a 25% alkali pretreatment. The color fatness to rubbing results showed better stability after washing and drying. The corresponding hysteresis loop indicated that the functional fabrics exhibited typical magnetism behavior with a closed “S” shape and a magnetic saturation value of 17.61 emu.g−1 with a particle size of 230 nm. However, the magnetic saturation value of the cotton fabric of 90 nm was just 4.89 emu.g−1, exhibiting controllable preparation for the aimed electromagnetic properties and great potential in radiation protective fields. The electrochemical properties of the functional fabrics exhibited extremely weak electrical conductivity caused by the movement of the magnetic dipole derived from the NdFe2O4 nanoparticles.
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Mochizuki, Chihiro, Junna Nakamura, and Michihiro Nakamura. "Development of Non-Porous Silica Nanoparticles towards Cancer Photo-Theranostics." Biomedicines 9, no. 1 (January 13, 2021): 73. http://dx.doi.org/10.3390/biomedicines9010073.

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Nanoparticles have demonstrated several advantages for biomedical applications, including for the development of multifunctional agents as innovative medicine. Silica nanoparticles hold a special position among the various types of functional nanoparticles, due to their unique structural and functional properties. The recent development of silica nanoparticles has led to a new trend in light-based nanomedicines. The application of light provides many advantages for in vivo imaging and therapy of certain diseases, including cancer. Mesoporous and non-porous silica nanoparticles have high potential for light-based nanomedicine. Each silica nanoparticle has a unique structure, which incorporates various functions to utilize optical properties. Such advantages enable silica nanoparticles to perform powerful and advanced optical imaging, from the in vivo level to the nano and micro levels, using not only visible light but also near-infrared light. Furthermore, applications such as photodynamic therapy, in which a lesion site is specifically irradiated with light to treat it, have also been advancing. Silica nanoparticles have shown the potential to play important roles in the integration of light-based diagnostics and therapeutics, termed “photo-theranostics”. Here, we review the recent development and progress of non-porous silica nanoparticles toward cancer “photo-theranostics”.
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Varma, Lanke Tejesh, Nidhi Singh, Bapi Gorain, Hira Choudhury, Murtaza M. Tambuwala, Prashant Kesharwani, and Rahul Shukla. "Recent Advances in Self-Assembled Nanoparticles for Drug Delivery." Current Drug Delivery 17, no. 4 (June 27, 2020): 279–91. http://dx.doi.org/10.2174/1567201817666200210122340.

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The collection of different bulk materials forms the nanoparticles, where the properties of the nanoparticle are solely different from the individual components before being ensembled. Selfassembled nanoparticles are basically a group of complex functional units that are formed by gathering the individual bulk components of the system. It includes micelles, polymeric nanoparticle, carbon nanotubes, liposomes and niosomes, <i>etc</i>. This self-assembly has progressively heightened interest to control the final complex structure of the nanoparticle and its associated properties. The main challenge of formulating self-assembled nanoparticle is to improve the delivery system, bioavailability, enhance circulation time, confer molecular targeting, controlled release, protection of the incorporated drug from external environment and also serve as nanocarriers for macromolecules. Ultimately, these self-assembled nanoparticles facilitate to overcome the physiological barriers <i>in vivo</i>. Self-assembly is an equilibrium process where both individual and assembled components are subsisting in equilibrium. It is a bottom up approach in which molecules are assembled spontaneously, non-covalently into a stable and welldefined structure. There are different approaches that have been adopted in fabrication of self-assembled nanoparticles by the researchers. The current review is enriched with strategies for nanoparticle selfassembly, associated properties, and its application in therapy.
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Dissertations / Theses on the topic "Nanoparticles - Functional Properties"

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Kemal, Lydia Materials Science &amp Engineering Faculty of Science UNSW. "Gold and silver nanoparticles: synthesis, characterization and functional properties." Publisher:University of New South Wales. Materials Science & Engineering, 2008. http://handle.unsw.edu.au/1959.4/43108.

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This thesis focuses on the shape-controlled metal nanoparticles for functional applications, covering the synthesis, characterization and optical properties. Three parts are mainly involved in this work, including, gold worm-like nanoparticles, silver nanoplates, and silver induced selenium nanowires. The first part focuses on a facile synthesis method for shape control of gold nanoparticles by treating an aqueous solution of chloroauric acid with sodium citrate and poly(vinyl pyrrolidone) (PVP), in which those worm-like nanoparticles were investigated by various advanced experimental characterizations combining density function theory (DFT) calculation. These nanoparticles can be used for optical sensing detection of ions in aqueous system. The second part involves the synthesis, growth, and optical properties of silver nanoplates (triangles and circular discs). Such nanoplates could be synthesized by a self-seeding co-reduction method at ambient conditions. In particular, molecular dynamics simulation is used to quantify the interaction energies between surfactant molecules and different facets of silver crystal. Such molecular information, together with measurements using x-ray diffraction (XRD), transmission electron microscopy (TEM), atomic force microscopy (AFM) and ultraviolet??visible (UV??vis) spectroscopy, has proven to be useful for understanding the growth mechanisms of silver nanoplates. The third part focuses on the template of silver nanoparticles for generating trigonal selenium (t-Se) nanowires. This technique exhibits some advantages in fabricating t-Se nanostructures, including no need to use stabilizers and sonichemical process and all operations being proceeded in aqueous media and at room temperature. Particularly it can successfully achieve the transformation from amorphous α-Se to crystalline t-Se in aqueous solution and this method would be useful for generating one-dimensional nanostructures with similar lattice parameter(s). It is considered that the technique for the shape-controlled metal nanoparticles can at least partially, be extended to other nanomaterials for functional applications.
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Weerawardene, K. L. Dimuthu M. "Optical and luminescence properties of noble metal nanoparticles." Diss., Kansas State University, 2017. http://hdl.handle.net/2097/38189.

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Doctor of Philosophy
Department of Chemistry
Christine M. Aikens
The remarkable optical and luminescence properties of noble metal nanoparticles (with diameters < 2 nm) attract researchers due to potential applications in biomedicine, photocatalysis, and optoelectronics. Extensive experimental investigations on luminescence properties of thiolate-protected gold and silver nanoclusters during the past decade have failed to unravel their exact photoluminescence mechanism. Herein, density functional and time-dependent density functional theory (DFT and TDDFT) calculations are performed to elucidate electronic-level details of several such systems upon photoexcitation. Multiple excited states are found to be involved in photoemission from Au₂₅(SR)₁₈– nanoclusters, and their energies agree well with experimental emission energies. The Au₁₃ core-based excitations arising due to electrons excited from superatom P orbitals into the lowest two superatom D orbitals are responsible for all of these states. The large Stokes shift is attributed to significant geometrical and electronic structure changes in the excited state. The origin of photoluminescence of Ag₂₅(SR)₁₈– nanoclusters is analogous to their gold counterparts and heteroatom doping of each cluster with silver and gold correspondingly does not affect their luminescence mechanism. Other systems have been examined in this work to determine how widespread these observations are. We observe a very small Stokes shift for Au₃₈(SH)₂₄ that correlates with a relatively rigid structure with small bond length changes in its Au₂₃ core and a large Stokes shift for Au₂₂(SH)₁₈ with a large degree of structural flexibility in its Au₇ core. This suggests a relationship between the Stokes shift of gold−thiolate nanoparticles and their structural flexibility upon photoexcitation. The effect of ligands on the geometric structure and optical properties of the Au₂₀(SR)₁₆ nanocluster is explored. Comparison of the relative stability and optical absorption spectra suggests that this system prefers the [Au₇(Au₈SR₈)(Au₃SR₄)(AuSR₂)₂] structure regardless of whether aliphatic or aromatic ligands are employed. The real-time (RT) TDDFT method is rapidly gaining prominence as an alternative approach to capture optical properties of molecular systems. A systematic benchmark study is performed to demonstrate the consistency of linear-response (LR) and RT-TDDFT methods for calculating the optical absorption spectra of a variety of bare gold and silver nanoparticles with different sizes and shapes.
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Huang, Xing. "Structure and Catalytic Properties of Ultra-Small Ceria Nanoparticles." UKnowledge, 2014. http://uknowledge.uky.edu/cme_etds/25.

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Cerium dioxide (ceria) is an excellent catalytic material due to its ability to both facilitate oxidation/reduction reactions as well as store/release oxygen as an oxygen buffer. The traditional approach to assess and improve ceria's catalytic behavior focuses on how efficiently O-vacancies can be generated and/or annihilated within the material, and how to extend established understandings of "bulk" ceria to further explain the greatly enhanced catalytic behavior of ultra-small ceria nanoparticles (uCNPs) with sizes less than 10 nm. Here, using density functional theory (DFT) calculations, we reexamine the atomic and electronic structures of uCNPs, especially their surface configurations. A unique picture dissimilar to the traditional point of view emerges from these calculations for the surface structure of uCNPs. uCNPs similar to those obtained by experimental synthesis and applied in catalytic environments exhibit core-shell like structures overall, with under-stoichiometric, reduced CNP "cores" and over-stoichiometric, oxidized surface "shell" constituted by various surface functional groups, e.g.,-Ox and/or -OH surface groups. Therefore, their catalytic behavior is dominated by surface chemistry rather than O-vacancies. Based on this finding, reaction pathways of two prevalent catalytic reactions, namely CO oxidation and the water-gas shift reaction over uCNPs are systematically investigated. Combined, these results demonstrate an alternative understanding of the surface structure of uCNPs, and provide new avenues to explore and enhance their catalytic behavior, which is likely applicable to other transition metal oxide nanoparticles with multivalent ions and very small sizes.
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Frenzel, Johannes. "Structural, electronic and optical properties of cadmium sulfide nanoparticles." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2007. http://nbn-resolving.de/urn:nbn:de:swb:14-1170678349152-44850.

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In this work, the structural, electronic, and optical properties of CdS nanoparticles with sizes up to 4nm have been calculated using density-functional theory (DFT). Inaccuracies in the description of the unoccupied states of the applied density-functional based tight-binding method (DFTB) are overcome by a new SCF-DFTB method. Density-functional-based calculations employing linear-response theory have been performed on cadmium sulfide nanoparticles considering different stoichiometries, underlying crystal structures (zincblende, wurtzite, rocksalt), particle shapes (spherical, cuboctahedral, tetrahedral), and saturations (unsaturated, partly saturated, completely saturated). For saturated particles, the calculated onset excitations are strong excitonic. The quantum-confinement effect in the lowest excitation is visible as the excitation energy decreases towards the bulk band gap with increasing particle size. Dangling bonds at unsaturated surface atoms introduce trapped surface states which lie below the lowest excitations of the completely saturated particles. The molecular orbitals (MOs), that are participating in the excitonic excitations, show the shape of the angular momenta of a hydrogen atom (s, p). Zincblende- and wurtzite-derived particles show very similar spectra, whereas the spectra of rocksalt-derived particles are rather featureless. Particle shapes that confine the orbital wavefunctions strongly (tetrahedron) give rise to less pronounced spectra with lower oscillator strengths. Finally, a very good agreement of the calculated data to experimentally available spectra and excitation energies is found.
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Frenzel, Johannes. "Structural, electronic and optical properties of cadmium sulfide nanoparticles." Doctoral thesis, Technische Universität Dresden, 2006. https://tud.qucosa.de/id/qucosa%3A23935.

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In this work, the structural, electronic, and optical properties of CdS nanoparticles with sizes up to 4nm have been calculated using density-functional theory (DFT). Inaccuracies in the description of the unoccupied states of the applied density-functional based tight-binding method (DFTB) are overcome by a new SCF-DFTB method. Density-functional-based calculations employing linear-response theory have been performed on cadmium sulfide nanoparticles considering different stoichiometries, underlying crystal structures (zincblende, wurtzite, rocksalt), particle shapes (spherical, cuboctahedral, tetrahedral), and saturations (unsaturated, partly saturated, completely saturated). For saturated particles, the calculated onset excitations are strong excitonic. The quantum-confinement effect in the lowest excitation is visible as the excitation energy decreases towards the bulk band gap with increasing particle size. Dangling bonds at unsaturated surface atoms introduce trapped surface states which lie below the lowest excitations of the completely saturated particles. The molecular orbitals (MOs), that are participating in the excitonic excitations, show the shape of the angular momenta of a hydrogen atom (s, p). Zincblende- and wurtzite-derived particles show very similar spectra, whereas the spectra of rocksalt-derived particles are rather featureless. Particle shapes that confine the orbital wavefunctions strongly (tetrahedron) give rise to less pronounced spectra with lower oscillator strengths. Finally, a very good agreement of the calculated data to experimentally available spectra and excitation energies is found.
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Pellegrini, Giovanni. "Modeling the optical properties of nanocluster-based functional plasmonic materials." Doctoral thesis, Università degli studi di Padova, 2008. http://hdl.handle.net/11577/3425967.

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Optical properties of nanocluster-based plasmonic materials were studied along this thesis by the Generalized Multiparticle Mie approach. Far- and local-field optical properties of basic plasmonic structures such as sphere dimers and chains were successfully analyzed as a function of their composition and their topological features. The provided physical insight is then exploited in the modeling of strongly coupled complex structures obtained by ion beam processing. These systems were called nanoplanets since they are constituted by a large central cluster surrounded by small satellite ones very close to its surface. Nanoplanets show extremely interesting far- and local-field properties which may be carefully tailored by varying the ion beam synthesis conditions. GMM theory allowed to establish that the strong interparticle coupling is at the base of their peculiar optical features. Finally multiple coupled cluster are proposed as efficient nanoantennae. Nanoparticle dimers were proved to provide extremely efficient broadband light extraction. If regular sphere array are used instead, broadband limitation imposed by isolated antennae may be overcome and tunable wavelength selective recombination rate enhancement is obtained. Overall this thesis gives an interesting insight in the plasmonic properties of functional multiple coupled cluster nanostructures.
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Yildirim, Handan. "STRUCTURAL, ELECTRONIC, VIBRATIONAL AND THERMODYNAMICAL PROPERTIES OF SURFACES AND NANOPARTICLES." Doctoral diss., University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3533.

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The main focus of the thesis is to have better understanding of the atomic and electronic structures, vibrational dynamics and thermodynamics of metallic surfaces and bi-metallic nanoparticles (NPs) via a multi-scale simulational approach. The research presented here involves the study of the physical and chemical properties of metallic surfaces and NPs that are useful to determine their functionality in building novel materials. The study follows the  bottom-up approach for which the knowledge gathered at the scale of atoms and NPs serves as a base to build, at the macroscopic scale, materials with desired physical and chemical properties. We use a variety of theoretical and computational tools with different degrees of accuracy to study problems in different time and length scales. Interactions between the atoms are derived using both Density Functional Theory (DFT) and Embedded Atom Method (EAM), depending on the scale of the problem at hand. For some cases, both methods are used for the purpose of comparison. For revealing the local contributions to the vibrational dynamics and thermodynamics for the systems possessing site-specific environments, a local approach in real-space is used, namely Real Space Green s Function method (RSGF). For simulating diffusion of atoms/clusters and growth on metal surfaces, Molecular Statics (MS) and Molecular Dynamics (MD) methods are employed.
Ph.D.
Department of Physics
Sciences
Physics PhD
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Guidez, Emilie Brigitte. "Quantum mechanical origin of the plasmonic properties of noble metal nanoparticles." Diss., Kansas State University, 2014. http://hdl.handle.net/2097/17314.

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Doctor of Philosophy
Department of Chemistry
Christine M. Aikens
Small silver and gold clusters (less than 2 nm) display a discrete absorption spectrum characteristic of molecular systems whereas larger particles display a strong, broad absorption band in the visible. The latter feature is due to the surface plasmon resonance, which is commonly explained by the collective dipolar motion of free electrons across the particle, creating charged surface states. The evolution between molecular properties and plasmon is investigated. Time-dependent density functional theory (TDDFT) calculations are performed to study the absorption spectrum of cluster-size silver and gold nanorods. The absorption spectrum of these silver nanorods exhibits high-intensity longitudinal and transverse modes (along the long and short axis of the nanorod respectively), similar to the plasmons observed experimentally for larger nanoparticles. These plasmon modes result from a constructive addition of the dipole moments of nearly degenerate single-particle excitations. The number of single-particle transitions involved increases with increasing system size, due to the growing density of states available. Gold nanorods exhibit a broader absorption spectrum than their silver counterpart due to enhanced relativistic effects, affecting the onset of the longitudinal plasmon mode. The high-energy, high-intensity beta-peak of acenes also results from a constructive addition of single-particle transitions and I show that it can be assigned to a plasmon. I also show that the plasmon modes of both acenes and metallic nanoparticles can be described with a simple configuration interaction (CI) interpretation. The evolution between molecular absorption spectrum and plasmon is also investigated by computing the density of states of spherical thiolate-protected gold clusters using a charge-perturbed particle-in-a-sphere model. The electronic structure obtained with this model gives good qualitative agreement with DFT calculations at a fraction of the cost. The progressive increase of the density of states with particle size observed is in accordance with the appearance of a plasmon peak. The optical properties of nanoparticles can be tuned by varying their composition. Therefore, the optical behavior of the bimetallic Au[subscript](25-n)Ag[subscript]n(SH)[subscript]18[superscript]- cluster for different values of n using TDDFT is analyzed. A large blue shift of the HOMO-LUMO absorption peak is observed with increasing silver content, in accordance with experimental results.
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Wang, Lingyan. "Design and fabrication of functional nanomaterials with tunable electrical, optical, and magnetic properties." Diss., Online access via UMI:, 2007.

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Calvo, de la Rosa Jaume. "Mechanical and functional properties in magnetic materials." Doctoral thesis, Universitat de Barcelona, 2019. http://hdl.handle.net/10803/667865.

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This doctoral Thesis has been focused on the preparation of magnetic materials by different methods, the characterization of their structural characteristics, and the understanding of their mechanical and magnetic properties. Furthermore, a big effort has been paid to investigate the frequency-dependent functional properties of different materials, which are increasingly demanded in novel technological applications. Moreover, this work presents this characterization in a wide range of frequencies, from the kHz to the THz. In the first chapter, the reader will find an introduction to the topic and the state of the art of those materials that have been synthesized and developed in this Thesis. Then, the general goals of our research are described. Chapter II provides all the needed fundamental theory to accomplish with the previously stated goals. The concepts exposed here will be used later in the following chapters where the results will be shown and discussed. Moreover, this chapter does not only pretend to give the essential notions used in the following chapter, but we also aim to provide a useful guide to anyone who starts working on this field. All the materials, devices, software, and experimental conditions used in this Thesis are described in Chapter III. Here, we describe these aspects in detail in order to allow an agile discussion in the following chapters. The first experimental chapter is Chapter IV, where the synthesis of copper ferrite nanoparticles by mean of sol-gel and co-precipitation is described. The sol-gel process is optimized through of design of experiments (DoE) approach. The results of the mechanical and magnetic characterization of solid pellets fabricated with the previously synthesized nanoparticles are also shown in this chapter. Finally, by using statistical methods a direct experimental correlation between the mechanical and magnetic properties is found in this material. Another material, a carbon nanotube–based nanocomposite, is studied in Chapter V. This novel material is first structurally characterized in order to understand its magnetic properties. A big effort is paid on the study of the magnetic relaxation of this material, which has not been previously reported as far as we know. The investigation of soft magnetic materials (SMM) and composites (SMC) can be found in Chapter VI. The actual SMCs are first structurally and magnetically characterized. Their magnetic properties in the kHz and MHz frequency range are also investigated, showing the better performance of the SMC at high frequencies. In the second part of the chapter, the development on new SMC’s formulations is described. The developed materials are potentially useful for applications in the kHz and MHz frequency range. The frequency is raised in Chapter VII. Terahertz time-domain spectroscopy (THz-TDS) is used to investigate the optical and dielectric properties of two different semiconductor oxides from 180 GHz to 3 THz. The signal processing and the interpretation of the effect that different characteristics of the sample may have on the observed properties are discussed. In this chapter, magnetic materials are not investigated because the Fresnel model – which is the base of this technique - assumes a non-magnetic response of the material. The work described in Chapter VIII is completely different from the previous ones. In this case, we investigate the manipulation of the magnetic moments by using surface acoustic waves (SAWs). The experiments done in this chapter lead to interesting observation about the potentiality of the use of SAWs to accelerate the magnetic moment reversal in magnetic nanoparticles.
Esta Tesis Doctoral se centra en el estudio de materiales magnéticos en su conjunto, tanto desde la síntesis hasta sus propiedades mecánicas y funcionales finales. Además, ha habido un especial interés en el estudio de las propiedades funcionales en un amplio rango frecuencial. De este modo, en el primer capítulo, el lector puede encontrar una introducción al campo de investigación, así como también el estado del arte de aquellos materiales que se han sintetizado y desarrollado en esta Tesis. Por otro lado, en el Capítulo II se aportan todos los conceptos teóricos necesarios para el siguiente desarrollo de la Tesis. Además, los materiales, dispositivos, software y condiciones experimentales utilizados durante el desarrollo de esta investigación están descritos en el Capítulo III. El Capítulo IV es la primera parte experimental de la Tesis, y en la que se describe la síntesis de nanopartículas de ferrita de cobre vía sol-gel y coprecipitación. Además, se estudian las propiedades magnéticas y mecánicas en bulk, y se analiza su correlación empírica. El Capítulo V está dedicado al estudio de un nuevo material: un nanocompuesto magnético basado en nanotubos de carbono. Inicialmente se caracteriza química y estructuralmente para después centrarse en las propiedades magnéticas. Se realiza, además, un detallado estudio de su relajación magnética. Por otro lado, en el Capítulo VI, se investigan materiales magnéticos blandos. Inicialmente se analizan los materiales actualmente utilizados, mientras que en una segunda parte se desarrollan nuevas formulaciones con interesantes propiedades tecnológicas. En el Capítulo VII se presenta el estudio de las propiedades ópticas y dieléctricas en el rango de los THz. Se describe detalladamente el método, análisis de señal, y efecto de las características físicas de la muestra sobre la medida. Finalmente, también se propone un método para cuantificar el efecto de la porosidad de las muestras. Por último, el Capítulo VIII se investiga la manipulación del momento magnético mediante estímulos mecánicos como las ondas acústicas superficiales (SAW, en inglés). Se observa una clara variación experimental con la aplicación de las SAWs, y se relaciona matemáticamente esta variación con la frecuencia y potencia de las SAWs.
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Books on the topic "Nanoparticles - Functional Properties"

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Berger, Thomas, and Oliver Diwald. Metal Oxide Nanoparticles: Formation, Functional Properties and Interfaces. Wiley & Sons, Limited, John, 2021.

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Berger, Thomas, and Oliver Diwald. Metal Oxide Nanoparticles: Formation, Functional Properties and Interfaces. Wiley & Sons, Incorporated, John, 2021.

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Berger, Thomas, and Oliver Diwald. Metal Oxide Nanoparticles: Formation, Functional Properties and Interfaces. Wiley & Sons, Incorporated, John, 2020.

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Berger, Thomas, and Oliver Diwald. Metal Oxide Nanoparticles: Formation, Functional Properties and Interfaces. Wiley & Sons, Incorporated, John, 2020.

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Functional Materials: Fundamental Research and Industrial Application. Trans Tech Publications, Limited, 2021.

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Book chapters on the topic "Nanoparticles - Functional Properties"

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Yan, Gongqin, Qiang He, and Dongyan Yu. "Synthesis and Properties Research of Coin-Like α-Fe2O3 Nanoparticles." In Advanced Functional Materials, 57–64. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0110-0_8.

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Polo, Ester, Valentina Castagnola, and Kenneth A. Dawson. "Understanding and Characterizing Functional Properties of Nanoparticles." In Pharmaceutical Nanotechnology: Innovation and Production, 63–80. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2016. http://dx.doi.org/10.1002/9783527800681.ch4.

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Stepanov, Andrey L. "Optical Properties of Metal Nanoparticles Formed by Ion Implantation and Modified by Laser Annealing." In Functional Properties of Nanostructured Materials, 139–60. Dordrecht: Springer Netherlands, 2006. http://dx.doi.org/10.1007/1-4020-4594-8_8.

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Wang, Hao, Xiaoze Jiang, Li Qian, Wenping Chen, and Meifang Zhu. "Preparation of Core-Shell ZrO2@SiO2 Nanoparticles and Its Effect on Properties of Composites." In Advanced Functional Materials, 723–30. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0110-0_80.

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Sharma, Chitven, Deepika Bansal, Dhruv Bhatnagar, Sanjeev Gautam, and Navdeep Goyal. "Advanced Nanomaterials: From Properties and Perspective Applications to Their Interlinked Confronts." In Advanced Functional Nanoparticles "Boon or Bane" for Environment Remediation Applications, 1–26. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-24416-2_1.

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Cakmak, Hulya, and Ece Sogut. "Functional Biobased Composite Polymers for Food Packaging Applications." In Reactive and Functional Polymers Volume One, 95–136. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-43403-8_6.

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AbstractBiobased polymers are of great interest due to the release of tension on non-renewable petroleum-based polymers for environmental concerns. However, biobased polymers usually have poor mechanical and barrier properties when used as the main component of coatings and films, but they can be improved by adding nanoscale reinforcing agents (nanoparticles - NPs or fillers), thus forming nanocomposites. The nano-sized components have a larger surface area that favors the filler-matrix interactions and the resulting material yield. For example, natural fibers from renewable plants could be used to improve the mechanical strength of the biobased composites. In addition to the mechanical properties, the optical, thermal and barrier properties are mainly effective on the selection of type or the ratio of biobased components. Biobased nanocomposites are one of the best alternatives to conventional polymer composites due to their low density, transparency, better surface properties and biodegradability, even with low filler contents. In addition, these biomaterials are also incorporated into composite films as nano-sized bio-fillers for the reinforcement or as carriers of some bioactive compounds. Therefore, nanostructures may provide antimicrobial properties, oxygen scavenging ability, enzyme immobilization or act as a temperature or oxygen sensor. The promising result of biobased functional polymer nanocomposites is shelf life extension of foods, and continuous improvements will face the future challenges. This chapter will focus on biobased materials used in nanocomposite polymers with their functional properties for food packaging applications.
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Ponomarova, Ludmila, Yuliya Dzyazko, Yurii Volfkovich, Valentin Sosenkin, and Sergey Scherbakov. "Effect of Incorporated Inorganic Nanoparticles on Porous Structure and Functional Properties of Strongly and Weakly Acidic Ion Exchangers." In Springer Proceedings in Physics, 63–77. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-92567-7_4.

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Wang, Shizhen, Lin Bian, Jianxun Qiu, Wei Du, Xintao Zhang, Xiaochun He, Mingjun Gao, Xiangming Li, Xingfa Ma, and Guang Li. "Preparation and Properties of Interconnected NiS Nanoparticle Network with Amphiphilic Polymers." In Advanced Functional Materials, 119–30. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0110-0_15.

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"5. Nanoparticles: Properties and applications." In Functional Materials, 101–20. De Gruyter, 2014. http://dx.doi.org/10.1515/9783110307825.101.

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Galian, Raquel Eugenia, and Julia Pérez-Prieto. "Synergism at the Nanoscale." In Research Perspectives on Functional Micro- and Nanoscale Coatings, 42–77. IGI Global, 2016. http://dx.doi.org/10.4018/978-1-5225-0066-7.ch003.

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Photoactive nanoparticles are smart systems that exhibit unique optical properties. In general, their intrinsic properties are size dependent. The degree and type of response to size are both related to their composition. Nanoparticles usually require to be capped with organic ligands in order to be dispersible in an aqueous or organic media, thus leading to nanoparticle colloidal dispersions and enhancing the processability of the material. The organic ligand also plays a key role in their preparation. In addition, the high surface-to-volume ratio of the nanoparticles combined with the affinity of the ligands for the nanoparticle surface can be used to place a large number of functional molecules at their periphery. The purpose of this chapter is to understand the synergism between nanoparticles and organic ligands with regard to their preparation, performance, and applicability.
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Conference papers on the topic "Nanoparticles - Functional Properties"

1

Sagapariya, Khushal, K. N. Rathod, Keval Gadani, Hetal Boricha, V. G. Shrimali, Bhargav Rajyaguru, Amiras Donga, et al. "Investigations on structural, optical and electrical properties of V2O5 nanoparticles." In FUNCTIONAL OXIDES AND NANOMATERIALS: Proceedings of the International Conference on Functional Oxides and Nanomaterials. Author(s), 2017. http://dx.doi.org/10.1063/1.4982084.

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Sharma, Sachil, N. S. Gajbhiye, R. S. Ningthoujam, Dinesh K. Aswal, and Anil K. Debnath. "Effect of Annealing on Magnetic Properties of FePd and FePdPt Nanoparticles." In INTERNATIONAL CONFERENCE ON PHYSICS OF EMERGING FUNCTIONAL MATERIALS (PEFM-2010). AIP, 2010. http://dx.doi.org/10.1063/1.3530464.

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Nongjai, Razia, Khalid Mujasam Batoo, Shakeel Khan, Dinesh K. Aswal, and Anil K. Debnath. "Study Of Structural And Dielectric Properties Of Ni-Mg Ferrite Nanoparticles." In INTERNATIONAL CONFERENCE ON PHYSICS OF EMERGING FUNCTIONAL MATERIALS (PEFM-2010). AIP, 2010. http://dx.doi.org/10.1063/1.3530540.

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Puli, Venkata Sreenivas, Shiva Adireddy, Ravinder Elupula, Sudheer Molugu, Josh Shipman, and Douglas B. Chrisey. "Synthesis and structural properties of Ba(1-x)LaxTiO3 perovskite nanoparticles fabricated by solvothermal synthesis route." In FUNCTIONAL OXIDES AND NANOMATERIALS: Proceedings of the International Conference on Functional Oxides and Nanomaterials. Author(s), 2017. http://dx.doi.org/10.1063/1.4982077.

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Baraliya, Jagdish D., Purvi M. Rakhashiya, Pooja P. Patel, Vrinda S. Thaker, and Hiren H. Joshi. "Comparative studies on structural properties and antimicrobial potential of spinel ferrite nanoparticles synthesized using various methods." In FUNCTIONAL OXIDES AND NANOMATERIALS: Proceedings of the International Conference on Functional Oxides and Nanomaterials. Author(s), 2017. http://dx.doi.org/10.1063/1.4982145.

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Goltsev, Anatoliy, Natalia Babenko, Mykola Bondarovych, Tatiana Dubrava, Yuliia Gaevska, and Volodymyr Klochkov. "Orthovanadate-Based Nanoparticles: Differences in Functional Activity of Cancer and Hematopoietic Stem Cells." In 2021 IEEE 11th International Conference Nanomaterials: Applications & Properties (NAP). IEEE, 2021. http://dx.doi.org/10.1109/nap51885.2021.9568604.

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He, Yi, and Taofang Zeng. "Modeling Optical Properties of Small Metallic Nanoparticles Based on Density Functional Theory." In ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference collocated with the ASME 2007 InterPACK Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ht2007-32843.

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Optical properties of silver nanoparticles with different diameters are investigated based on the electronic structures of component silver atoms. Within the frame of tight binding method, the local density of states of each silver atom is obtained through a recursive approach that extracts the required information directly from the Hamilton matrix. Then the interaction between the electric field of incident light and electrons in the nanoparticles is simulated to characterize their optical features and the size effects were interpreted according the results.
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Wei, Ziyu, Li Quanjun, Nikita Liedienov, Georgiy Levchenko, Aleksei Pashchenko, Igor Fesych, Eduard Zubov, et al. "Morphology and Functional Properties of Magnetic Nanoparticles of Lanthanum-Strontium Manganites." In 2019 IEEE 39th International Conference on Electronics and Nanotechnology (ELNANO). IEEE, 2019. http://dx.doi.org/10.1109/elnano.2019.8783683.

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"Protein-lipid nanoparticles for studying G-protein coupled receptors functional properties." In Bioinformatics of Genome Regulation and Structure/Systems Biology (BGRS/SB-2022) :. Institute of Cytology and Genetics, the Siberian Branch of the Russian Academy of Sciences, 2022. http://dx.doi.org/10.18699/sbb-2022-146.

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Jambhulkar, Sayli, and Kenan Song. "1D and 2D Nanoparticle Assembly Compliant With Tuned 3D-Printed Topology." In ASME 2022 17th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/msec2022-85050.

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Abstract Nanoparticle-included polymeric composite coatings with preferential nanoparticle alignment and oriented structures show improved functional and structural properties than randomly oriented structures, suitable for broad applications in microelectronics, automobile, defense, and space missions. Traditionally used techniques, such as drop-casting, chemically modified surfaces, and external fields, have been used for self-assembly but with several disadvantages, such as material limitations. Thus, there is a need to develop a new approach for generating hierarchical nanoparticle structures. Our unique processing is based on advanced additive manufacturing with a colloidal suspension-based deposition approach for layer-by-layer deposition of anisotropic nanoparticles. Leveraging the colloidal deposition technique, these anisotropic nanoparticles were deposited onto the 3D printed substrates with designed patterning. The presence of micropatterns generates selective nanoparticle distribution and assembly along with hydrodynamic forces to initiate the region-specific microscale patterning and nanoscale alignment of 1D and 2D nanoparticles. The polymer and nanoparticle composite film showed different deposition morphologies (e.g., straight or wavy films). In addition, the influence of nanoparticle deposition morphology on functional properties was investigated. This novel technique shows the potential to scale up microelectronics production by 3D printing electronic structures, including interdigitated devices, supercapacitors, fuel cells, and circuits.
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