Relevant bibliographies by topics / Nanoflowers

Academic literature on the topic 'Nanoflowers'

Author: Grafiati
Published: 6 September 2023

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Journal articles on the topic "Nanoflowers"

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Gqoba, Siziwe S., Rafael Rodrigues, Sharon Lerato Mphahlele, Zakhele Ndala, Mildred Airo, Paul Olawale Fadojutimi, Ivo A. Hümmelgen, Ella C. Linganiso, Makwena J. Moloto, and Nosipho Moloto. "Hierarchical Nanoflowers of Colloidal WS2 and Their Potential Gas Sensing Properties for Room Temperature Detection of Ammonia." Processes 9, no. 9 (August 25, 2021): 1491. http://dx.doi.org/10.3390/pr9091491.

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A one-step colloidal synthesis of hierarchical nanoflowers of WS2 is reported. The nanoflowers were used to fabricate a chemical sensor for the detection of ammonia vapors at room temperature. The gas sensing performance of the WS2 nanoflowers was measured using an in-house custom-made gas chamber. SEM analysis revealed that the nanoflowers were made up of petals and that the nanoflowers self-assembled to form hierarchical structures. Meanwhile, TEM showed the exposed edges of the petals that make up the nanoflower. A band gap of 1.98 eV confirmed a transition from indirect-to-direct band gap as well as a reduction in the number of layers of the WS2 nanoflowers. The formation of WS2 was confirmed by XPS and XRD with traces of the oxide phase, WO3. XPS analysis also confirmed the successful capping of the nanoflowers. The WS2 nanoflowers exhibited a good response and selectivity for ammonia.
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Xue, Zeyang, Feiyang Li, Chunhu Yu, Jianfeng Huang, Feihu Tao, Zhengyu Cai, Hui Zhang, and Lizhai Pei. "Low temperature synthesis of SnSr(OH)6 nanoflowers and photocatalytic performance for organic pollutants." International Journal of Materials Research 113, no. 1 (January 1, 2022): 80–90. http://dx.doi.org/10.1515/ijmr-2021-8333.

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Abstract A simple low temperature hydrothermal route has been used for the synthesis of strontium tin hydroxide (SrSn(OH)6) nanoflowers. The synthesized SrSn(OH)6 nanoflowers were investigated by means of powder X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy and solid ultraviolet−visible diffuse reflectance spectroscopy. The SrSn(OH)6 nanoflowers are composed of nanorods with hexagonal structure, length and diameter of about 2 µm and 30–100 nm, respectively. The growth process of the SrSn(OH)6 nanoflowers is proposed as the Ostwald ripening and crystal splitting process based on the morphological evolution from different hydrothermal conditions. The band gap of the nanoflowers is 3.53 eV. The SrSn(OH)6 nanoflowers were utilized for the photocatalytic degradation of gentian violet under ultraviolet light irradiation. The roles of various factors including irradiation time and nanoflower dosage on the photocatalytic activity of the SrSn(OH)6 nanoflowers are discussed. The possible photocatalytic mechanism for gentian violet degradation using the SrSn(OH)6 nanoflowers was determined by radical trapping experiments. The SrSn(OH)6 nanoflowers possess good stability and are an efficient photocatalyst for the removal of organic pollutants.
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Khan, Muhammad Arif, Nafarizal Nayan, Shadiullah, Mohd Khairul Ahmad, Soon Chin Fhong, Muhammad Tahir, Riyaz Ahmad Mohamed Ali, and Mohamed Sultan Mohamed Ali. "Advanced Nanoscale Surface Characterization of CuO Nanoflowers for Significant Enhancement of Catalytic Properties." Molecules 26, no. 9 (May 4, 2021): 2700. http://dx.doi.org/10.3390/molecules26092700.

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In this work, advanced nanoscale surface characterization of CuO Nanoflowers synthesized by controlled hydrothermal approach for significant enhancement of catalytic properties has been investigated. The CuO nanoflower samples were characterized by field-emission scanning electron microscopy (FE-SEM), X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, high-resolution transmission electron microscopy (HR-TEM), selected-area electron diffraction (SAED), high-angular annular dark field scanning transmission electron microscopy (HAADF-STEM) with elemental mapping, energy dispersive spectroscopy (STEM-EDS) and UV–Vis spectroscopy techniques. The nanoscale analysis of the surface study of monodispersed individual CuO nanoflower confirmed the fine crystalline shaped morphology composed of ultrathin leaves, monoclinic structure and purified phase. The result of HR-TEM shows that the length of one ultrathin leaf of copper oxide nanoflower is about ~650–700 nm, base is about ~300.77 ± 30 nm and the average thickness of the tip of individual ultrathin leaf of copper oxide nanoflower is about ~10 ± 2 nm. Enhanced absorption of visible light ~850 nm and larger value of band gap energy (1.68 eV) have further supported that the as-grown material (CuO nanoflowers) is an active and well-designed surface morphology at the nanoscale level. Furthermore, significant enhancement of catalytic properties of copper oxide nanoflowers in the presence of H2O2 for the degradation of methylene blue (MB) with efficiency ~96.7% after 170 min was obtained. The results showed that the superb catalytic performance of well-fabricated CuO nanoflowers can open a new way for substantial applications of dye removal from wastewater and environment fields.
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Upadhyay, Archana, Huan Yang, Bilal Zaman, Lei Zhang, Yundi Wu, Jinhua Wang, Jianguo Zhao, Chenghong Liao, and Qian Han. "ZnO Nanoflower-Based NanoPCR as an Efficient Diagnostic Tool for Quick Diagnosis of Canine Vector-Borne Pathogens." Pathogens 9, no. 2 (February 14, 2020): 122. http://dx.doi.org/10.3390/pathogens9020122.

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Polymerase chain reaction (PCR) is a unique technique in molecular biology and biotechnology for amplifying target DNA strands, and is also considered as a gold standard for the diagnosis of many canine diseases as well as many other infectious diseases. However, PCR still faces many challenges and issues related to its sensitivity, specificity, efficiency, and turnaround time. To address these issues, we described the use of unique ZnO nanoflowers in PCR reaction and an efficient ZnO nanoflower-based PCR (nanoPCR) for the molecular diagnosis of canine vector-borne diseases (CVBDs). A total of 1 mM of an aqueous solution of ZnO nanoflowers incorporated in PCR showed a significant enhancement of the PCR assay with respect to its sensitivity and specificity for the diagnosis of two important CVBDs, Babesia canis vogeli and Hepatozoon canis. Interestingly, it drastically reduced the turnaround time of the PCR assay without compromising the yield of the amplified DNA, which can be of benefit for veterinary practitioners for the improved management of diseases. This can be attributed to the favorable adsorption of ZnO nanoflowers to the DNA and thermal conductivity of ZnO nanoflowers. The unique ZnO nanoflower-assisted nanoPCR greatly improved the yield, purity, and quality of the amplified products, but the mechanism behind these properties and the effects and changes due to the different concentrations of ZnO nanoflowers in the PCR system needs to be further studied.
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Lee, Su Jung, Hongje Jang, and Do Nam Lee. "Inorganic Nanoflowers—Synthetic Strategies and Physicochemical Properties for Biomedical Applications: A Review." Pharmaceutics 14, no. 9 (September 6, 2022): 1887. http://dx.doi.org/10.3390/pharmaceutics14091887.

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Nanoflowers, which are flower-shaped nanomaterials, have attracted significant attention from scientists due to their unique morphologies, facile synthetic methods, and physicochemical properties such as a high surface-to-volume ratio, enhanced charge transfer and carrier immobility, and an increased surface reaction efficiency. Nanoflowers can be synthesized using inorganic or organic materials, or a combination of both (called a hybrid), and are mainly used for biomedical applications. Thus far, researchers have focused on hybrid nanoflowers and only a few studies on inorganic nanoflowers have been reported. For the first time in the literature, we have consolidated all the reports on the biomedical applications of inorganic nanoflowers in this review. Herein, we review some important inorganic nanoflowers, which have applications in antibacterial treatment, wound healing, combinatorial cancer therapy, drug delivery, and biosensors to detect diseased conditions such as diabetes, amyloidosis, and hydrogen peroxide poisoning. In addition, we discuss the recent advances in their biomedical applications and preparation methods. Finally, we provide a perspective on the current trends and potential future directions in nanoflower research. The development of inorganic nanoflowers for biomedical applications has been limited to date. Therefore, a diverse range of nanoflowers comprising inorganic elements and materials with composite structures must be synthesized using ecofriendly synthetic strategies.
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Jaramillo, Oscar A., Reshmi Raman, and Marina E. Rincón. "Effect of the Nucleation Layer on TiO2 Nanoflowers Growth via Solvothermal Synthesis." MRS Proceedings 1479 (2012): 95–100. http://dx.doi.org/10.1557/opl.2012.1604.

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ABSTRACTTiO2 nanoflowers were obtained on modified ITO substrates by solvothermal synthesis. Surface modification was achieved with a layer of TiO2 seeds/nucleus obtained by dip-coating at various pH and dip cycles. Field emission scanning electron microscopy results indicated that at all nucleation conditions there was a dual population of TiO2 nanoparticles and nanoflowers. For a particular pH, the effect of increasing the number of dips was to increase the size and number of the nanoflowers, whereas for a fixed number of dips, the increase in pH causes a decrease in nanoflower population. The comparison with solvothermal films obtained on unmodified substrates indicates that TiO2 nanoflowers grew up on the nucleation sites. These microstructural changes determine the active surface area and sensing properties of the solvothermal films. At room temperature, no evidence of superior ethanol sensing properties was found for TiO2 nanoflowers, which show larger resistivity than TiO2 nanoparticles.
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Zheng, Lu, Yining Sun, Jing Wang, He Huang, Xin Geng, Yi Tong, and Zhi Wang. "Preparation of a Flower-Like Immobilized D-Psicose 3-Epimerase with Enhanced Catalytic Performance." Catalysts 8, no. 10 (October 18, 2018): 468. http://dx.doi.org/10.3390/catal8100468.

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In this present study, we proposed a smart biomineralization method for creating hybrid organic–inorganic nanoflowers using a Co2+-dependent enzyme (D-psicose 3-epimerase; DPEase) as the organic component and cobalt phosphate as the inorganic component. The prepared nanoflowers have many separated petals that have a nanometer size. Under optimum conditions (60 °C and pH of 8.5), the nanoflower can display its maximum activity (36.2 U/mg), which is about 7.2-fold higher than free DPEase. Furthermore, the immobilized DPEase presents enhanced pH and thermal stabilities. The DPEase-nanoflower maintained about 90% of its activity after six reaction cycles, highlighting its excellent reusability.
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Xiang, Chao, Tingting Chen, Yan Zhao, Jianhai Sun, Kaisheng Jiang, Yongzhen Li, Xiaofeng Zhu, Xinxiao Zhang, Ning Zhang, and Ruihua Guo. "Facile Hydrothermal Synthesis of SnO2 Nanoflowers for Low-Concentration Formaldehyde Detection." Nanomaterials 12, no. 13 (June 21, 2022): 2133. http://dx.doi.org/10.3390/nano12132133.

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In this work, SnO2 nanoflowers were prepared by a simple one-step hydrothermal process. The morphology and structure of SnO2 nanoflowers were characterized by SEM, TEM, Raman spectroscopy, and XRD, which demonstrated the good crystallinity of the SnO2 tetrahedron structure of the as-synthesized materials. In addition, the sensing properties of SnO2 nanoflowers were studied in detail. It was found that the SnO2 nanoflower-based gas sensor exhibits excellent gas response (9.2 to 120 ppm), fast response and recovery (2/15 s to 6 ppm), good linearity of correlation between response (S) vs. concentration (C) (lgS = 0.505 lgC − 0.147, R2 = 0.9863), superb repeatability, and selectivity at 300 °C. The outstanding performance can also be attributed to the high specific surface area ratio and size of SnO2 nanoflowers close to the thickness of the electron depletion layer that can provide abundant active sites, promote the rate of interaction, and make it easier for gas molecules to diffuse into the interior of the material. Therefore, SnO2 nanoflowers can be an ideal sensing material for real-time monitoring of low-concentration HCHO.
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Amna, Touseef. "Shape-controlled synthesis of three-dimensional zinc oxide nanoflowers for disinfection of food pathogens." Zeitschrift für Naturforschung C 73, no. 7-8 (July 26, 2018): 297–301. http://dx.doi.org/10.1515/znc-2017-0195.

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Abstract The antibacterial activity of zinc oxide (ZnO) nanoflowers has been investigated and presented in this article. Classic three-dimensional nanoflowers have been prepared by hydrothermal method using zinc acetate dihydrate Zn(CH3COO)2·2H2O as the sole precursor. The X-ray diffraction and Fourier transform infrared spectra confirm the formation of ZnO crystals. Consequently, on the basis of morphological and chemical observations, the chemical reaction mechanism of ZnO nanoflowers was also proposed. Antibacterial activity was carried out against food-borne pathogen, Escherichia coli, which is ubiquitous in distribution among food-laden wastes. The experimental procedures for the antibacterial test included a spectroscopic method with different concentrations (5–20 μg/mL) of ZnO nanoflowers to unearth the minimum inhibitory concentration. Our investigation suggests that the lowest concentration of ZnO nanoflower solution that can hamper the growth of this microbial strain was 5 μg/mL.
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Jing Han, Siow, Mariam Ameen, Mohamad Fahrul Radzi Hanifah, Aqsha Aqsha, Muhammad Roil Bilad, Juhana Jaafar, and Soorathep Kheawhom. "Catalytic Evaluation of Nanoflower Structured Manganese Oxide Electrocatalyst for Oxygen Reduction in Alkaline Media." Catalysts 10, no. 8 (July 23, 2020): 822. http://dx.doi.org/10.3390/catal10080822.

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An electrochemical nanoflowers manganese oxide (MnO2) catalyst has gained much interest due to its high stability and high specific surface area. However, there are a lack of insightful studies of electrocatalyst performance in nanoflower MnO2. This study assesses the electrocatalytic performances of nanoflower structure MnO2 for both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in a zinc–air battery as a bifunctional electrocatalyst. The prepared catalyst was characterized in term of morphology, crystallinity, and total surface area. Cyclic voltammetry and linear sweep voltammetry were used to evaluate the electrochemical behaviors of the as-prepared nanoflower-like MnO2. The discharge performance test for zinc–air battery with a MnO2 catalyst was also conducted. The results show that the MnO2 prepared at dwell times of 2, 4 and 6 h were nanoflowers, nanoflower mixed with nanowires, and nanowires with corresponding specific surface areas of 52.4, 34.9 and 32.4 g/cm2, respectively. The nanoflower-like MnO2 catalyst exhibits a better electrocatalytic performance towards both ORR and OER compared to the nanowires. The number of electrons transferred for the MnO2 with nanoflower, nanoflower mixed with nanowires, and nanowire structures is 3.68, 3.31 and 3.00, respectively. The as-prepared MnO2 nanoflower-like structure exhibits the best discharge performance of 31% higher than the nanowires and reaches up to 30% of the theoretical discharge capacity of the zinc–air battery.
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Dissertations / Theses on the topic "Nanoflowers"

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Pacaud, Mathias. "Synthesis and physico-chemical evaluation of gold nanoflowers (AuNFs) as new substrates for bioanalytical SERS." Thesis, Tours, 2019. http://www.theses.fr/2019TOUR3804.

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Un immense intérêt est porté sur les nanostructures métalliques anisotropes d’or (AuNFs) qui s’explique par les propriétés uniques qu’elles procurent et qui peuvent servir dans divers domaines, notamment dans le biomédicale. On cherche à maitriser leurs propriétés optiques liées aux oscillations collectives d’électrons de surface appelées plasmons. Elles possèdent une bande de résonance plasmonique localisée de surface (LSPR, comme localized surface plasmon resonance) située dans le rouge - proche infrarouge (> 600 nm). Leur capacité d’interagir avec la lumière rouge - proche IR (fenêtre optique biologique) les rend intéressantes en tant qu’agent d’imagerie optique et opto-acoustique. Dans le cas particulier de la diffusion Raman exaltée de surface (SERS, comme surface-enhanced Raman scattering), les AuNFs sont capables de procurer les zones d’exaltation appelées « hot spots » dans les jonctions entre leurs pétales. Ainsi, on peut les utiliser comme substrat SERS sans avoir besoin de les agréger, à la différence des nanosphères d’or. Le protocole de synthèse des AuNFs que nous avons développé est rapide, en une seule étape et n’utilise qu’un nombre réduit de réactifs connus qui sont peu ou pas toxiques. De plus, notre protocole permet de contrôler les caractéristiques des AuNFs telles que leur taille et la position de leur bande LSPR, entre 600 et 900 nm. Afin de garantir une stabilité colloïdale dans des milieux divers, nous avons enrobé nos AuNFs avec des polymères biocompatibles (alginates, chitosan, Pluronics, PVP et PEG) ou les avons encapsulées dans une matrice de silice. Les substrats colloïdaux à base de ces AuNFs enrobées d’enveloppes biocompatibles ont ainsi montré leur potentiel pour procurer l’effet SERS sans agrégation et permettre l’analyse ultrasensible de petits chromophores (comme le Bleu de Nil). De plus, nos résultats montrent que ces nouveaux substrats sont capables de délivrer une charge de molécules dans des cellules cancéreuses. Ainsi, ils semblent prometteurs en tant qu’agents théranostiques, applicables non seulement en SERS, mais également en imagerie optique ou opto-acoustique et en thérapie
A huge attention is paid on anisotropic gold metal nanostructures (AuNFs) because of the unique properties they can provide in various fields, in particular the biomedical applications. We are trying to control their optical properties related to the collective oscillations of surface electrons called plasmons. They have a localized surface plasmon resonance band (LSPR) located in the red - near infrared (> 600 nm). Their ability to interact with red light - near IR (optical biological window) makes them interesting as optical and optoacoustic imaging agents. In the specific case of the surface-enhanced Raman scattering (SERS), AuNFs are able to provide enhancement zones called "hot spots" in the junctions between their petals. Thus, they can be used as SERS substrates without the need to be aggregated, unlike for gold nanospheres. The protocol to synthesize AuNFs that we developed is fast, in one-step and uses only a small number of known reagents that are low or non-toxic. In addition, our protocol allows us to tune the characteristics of the AuNFs such as their size and the position of their LSPR band, between 600 and 900 nm. In order to guarantee their colloidal stability in various media, we have coated our AuNFs with biocompatible polymers (alginates, chitosan, Pluronics, PVP and PEG) or encapsulated them in a silica matrix. Colloidal substrates based on these AuNFs coated with biocompatible envelopes have thus shown their potential to provide the SERS effect without aggregation and allow the ultra-sensitive analysis of small chromophores (such as Nile Blue). In addition, our results show that these new substrates are able to deliver a cargo of molecules to the cancer cells. Thus, they seem promising as theranostic agents, applicable not only in SERS, but also in optical or optoacoustic imaging and therapy
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Mohamed, said Nasser. "Assemblage contrôlé des nanofleurs d'oxyde de fer et des nanoparticules d'or : ou comment associer Hyperthermie et Radiothérapie." Thesis, Bourgogne Franche-Comté, 2018. http://www.theses.fr/2018UBFCD070.

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Dans les domaines de l’imagerie médicale et la thérapie, l’utilisation des nanoparticules est spécialement attrayante et prometteuse. Il est possible de concentrer dans une même particule plusieurs fonctions complémentaires comme la détection, le ciblage mais aussi la thérapie. Cette multifonctionnalité présente de nombreux avantages, et favorise le développement de nanoparticules pour une thérapie ciblée et guidée par l’imagerie.C’est dans ce contexte d’intense activité centrée sur le développement des nanoparticules pour les applications médicales (imagerie et/ou thérapie) que s’est déroulé mon travail de thèse qui s’inscrit dans la continuité des travaux de Christophe Alric et de Pierre Hugounenq. Ils ont développé respectivement des nanoparticules d’or multifonctionnelles (Au@DTDTPA) et des nanofleurs d’oxyde de fer (γ-Fe2O3).Les nanoparticules d’or (Au@DTDTPA) présentent un effet radiosensibilisant et se comportent comme agent de contraste pour l’IRM (après marquage par Gd3+ rendu possible par les propriétés chélatantes de la couche organique DTDTPA) ou comme radiotraceurs après radiomarquage (le DTDTPA forme des complexes stables avec 99mTc et 111In). Le caractère superparamagnétique des nanofleurs d’oxyde de fer confèrent à ces objets la capacité à rehausser le contraste négatif des images et à induire un échauffement sous l’action d’un champ magnétique alternatif de haute fréquence.L’objectif principal de ma thèse consistait à assembler ces deux types de nanoparticules afin de créer un objet nanométrique combinant les propriétés complémentaires des nanoparticules d’or et des nanofleurs d’oxyde de fer. Dans un premier temps, les conditions optimales de greffage des nanoparticules d’or sur les nanofleurs ont été déterminées. Nous avons montré que de tels agents présentaient après injection intraveineuse une biodistribution adaptée comme le révèlent les images acquises en IRM (grâce aux propriétés magnétiques des nanofleurs) et en TEMP (grâce au radiomarquage de la couche des nanoparticules d’or). En outre ces objets présentent un caractère radiosensibilisant qui est mieux exploité que celui des nanoparticules d’or entrant dans la composition de ces nanofleurs dorées. Associé au pouvoir chauffant des nanofleurs, le pouvoir radiosensibilisant des nanofleurs dorées a conduit à une forte inhibition de la croissance tumorale quand le traitement de rats portant un mélanome combine hyperthermie magnétique et radiothérapie après injection intratumorale des nanofleurs dorées.En conclusion, le travail réalisé au cours de cette thèse a mis en évidence l’intérêt de combiner les nanoparticules d’or et les nanofleurs d’oxyde de fer pour traiter des tumeurs solides par thérapie guidée par imagerie
In the fields of medical imaging and therapy, the use of nanoparticles is especially attractive and promising. It is possible to concentrate in the same particle several complementary functions such as detection, targeting but also therapy. This multifunctionality has many advantages and promotes the development of nanoparticles for targeted therapy and guided by medical imaging.It is in this context of intense activity focused on the development of nanoparticles for medical applications (imaging and/or therapy) that my thesis work was carried out which is in continuity with the work of Christophe Alric and Pierre Hugounenq. They developed multifunctional gold nanoparticles (Au@DTDTPA) and iron oxide nanoflowers (γ-Fe2O3), respectively.The gold nanoparticles (Au @ DTDTPA) exhibit a radiosensitizing effect and behave as a contrast agent for MRI (after labeling with Gd3 +, made possible by the chelating properties of the organic layer DTDTPA) or radiotracers after radiolabelling (DTDTPA forms stable complexes with 99mTc and 111In). The superparamagnetic nature of the iron oxide nanoflowers gives these objects the ability to enhance the negative contrast of the images and to induce heating under the action of an alternating magnetic field of high frequency.The main objective of my thesis was to assemble these two types of nanoparticles in order to create a nanometric object combining the complementary properties of gold nanoparticles and iron oxide nanoflowers. In a first step, the optimal conditions for grafting gold nanoparticles on the nanoflower were determined. We have shown that, after intravenous injection, these agents exhibit a suitable biodistribution, as revealed by MRI images (thanks to the magnetic properties of nanoflowers) and SPECT (thanks to the radiolabeling of the gold nanoparticle layer). Moreover, these objects have a radiosensitizing character which is better exploited than that of the gold nanoparticles in the golden nanoflowers. Associated with the heating power of nanoflower, the radiosensitizing potential of golden nanoflowers has led to a strong inhibition of tumor growth when the treatment of rats carrying melanoma combines magnetic hyperthermia and radiotherapy after injection of golden nanoflower.In conclusion, the work carried out during this thesis has highlighted the value of combining gold nanoparticles and iron oxide nanoflowers to treat solid tumors by imaging-guided therapy
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Santos, Olavo Amorim. "Desenvolvimento de nanoflores de ouro fotoativas para terapia e diagnóstico de câncer." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/76/76132/tde-30012018-155754/.

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Nanopartículas de ouro têm mostrado enorme potencial de aplicação em modalidades diagnósticas e terapêuticas fotoativadas. Em especial, nanoestruturas de ouro anisotrópicas ramificadas apresentam excelente desempenho atuando tanto como contrastes de imagens fotoacústicas, quanto como agentes ativos para terapias fototérmicas de câncer. Apesar dos avanços nas suas rotas de síntese, o desenvolvimento dessas nanoestruturas de forma simples e reprodutível ainda é desafiador. O presente trabalho visou o desenvolvimento de nanopartículas de ouro anisotrópicas ramificadas, ou nanoflores, que sejam fotoativas no infravermelho-próximo para a terapia e diagnóstico de câncer. Em particular, buscou-se o desenvolvimento de uma síntese simples para sua obtenção, assim como a verificação de sua atuação como agente de contraste fotoacústico e como agente ativo para hipertermia de tumores. Para tanto, desenvolveu-se uma síntese in situ que permitiu a obtenção de nanoflores monodispersas com tamanho e propriedades ópticas controláveis. Através da variação de aspectos da síntese, como a temperatura e a concentração de ouro, foi possível sintonizar a atividade óptica das partículas entre 590 e 960 nm. Sua formação foi confirmada por microscopia eletrônica de varredura, espalhamento de luz dinâmico e espectroscopia UV-visível. As partículas apresentaram boa estabilidade de suas características físico-químicas por dois meses e meio. Ainda, as nanoflores se mostraram estáveis, também, quando suspensas em meio de cultura, sob irradiação de lasers, e quando mantidas a temperatura corpórea por longos intervalos. Sua resposta fotoacústica foi caracterizada, apresentando sinais significativos e permitindo a obtenção de imagens claras de sua localização, mesmo em baixas concentrações. Testes realizados em cultura de células mostraram que as nanoflores foram eficazes na hipertermia de uma linhagem de hepatocarcinoma de rato (HTC), ao mesmo tempo que não apresentaram sinais de toxicidade a uma linhagem de fibroblastos de camundongos (FC3H). Esses resultados revelam uma possibilidade simples de fabricação de nanoestruturas de ouro anisotrópicas ramificadas, que podem servir como uma plataforma promissora para o diagnóstico e terapia do câncer.
Gold nanoparticles have shown enormous potential of application in photodiagnostic and in phototherapeutic procedures. Notably, branched anisotropic gold nanostructures present distinguished performance acting as contrast agents of photoacoustic images and as active agents for photothermal therapies for cancer. Despite advances in their synthesis routes, the growth of these nanostructures in a simple and reproducible way is still challenging. The present study was aimed at developing branched anisotropic gold nanoparticles, coined nanoflowers, that are photoactive in the near-infrared for therapy and diagnosis of cancer. In particular, we sought to develop a simple synthesis route, as well as to verify its application for both, as photoacoustic contrast agents and as active agents for tumor hyperthermia. An in situ synthesis was developed which allowed the development of monodisperse nanoflowers with controllable size and optical properties. Through variations of certain aspects of this procedure, such as temperature and gold ions concentration, it was possible to tune the optical activity of the particles between 590 and 960 nm. The nanostructure morphology was confirmed by scanning electron microscopy, dynamic light scattering and UV-visible spectroscopy. The particles exhibited consistent physicochemical characteristics and good stability for two and a half months. Furthermore, the nanoflowers were also stable when suspended in cell culture medium, under laser irradiation and when maintained at body temperature for long intervals. Its photoacoustic response was characterized, presenting significant responses and generating clear images of its location, even at low concentrations. In vitro tests revealed that these nanoflowers were effective therapeutic agents for photothermal therapy of a rat hepatocarcinoma (HTC) lineage, while showing no signs of toxicity to mouse fibroblast (FC3H) cell line. These results reveal a simple procedure of synthesizing branched anisotropic gold nanostructures, which can serve as a promising platform for cancer diagnosis and therapy.
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Tian, Yujing. "Boosting Reaction Kinetics of N2 Electrocatalysis via Adsorption Enhancement and Confinement of Adsorbates." University of Cincinnati / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ucin159239534417192.

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Lei, Wenwen. "The physics of water leaks and water nanoflows." Thesis, The University of Sydney, 2014. http://hdl.handle.net/2123/13295.

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The encapsulation of devices sensitive to moisture is necessary to prolong lifetimes under adverse environmental conditions. Therefore, quantifying moisture flow is important in design and verification of the encapsulations. Gaseous flows have been studied after Knudsen’s paper appeared in 1909, with one important exception: water vapour. A recent unexpected finding from Holt et al. concerned ultra-fast water and air flows in carbon nanotubes. While Gruener and Huber did not obtain ultra-fast nitrogen flows in silicon nanotubes. This leaves us to concern main effective factors for flows in tubes. We use a theory of extended Navier-Stokes equations, having one equation for all flow regimes with an empirical parameter (Cha and McCoy theory), for predicting flow rates of nitrogen and water vapour through a 25 μm diameter silica glass cylindrical tube under isothermal condition. We measure nitrogen flow rates through microtubes across a wide range of Knudsen number (0.0048 ~ 12.4583) using a two-chamber method. We find that the nitrogen flow obeys the Cha and McCoy theory with values of the tangential momentum accommodation coefficient (TMAC) α= 0.91 at small Kn and α close to one at large Kn, consistent with the redefinition of α by Arya et al. We obtain fast transport of water vapour compared to the predictions from the Cha and McCoy theory over a range of pressures using the two-chamber method and a mass loss method. We attribute the excess flows to: (1) a thin adsorbed layer of chain-like water on the walls reducing the TMAC at low pressures; (2) liquid or two-phase flow appearing for inlet pressure close to saturation pressure. A theory for TMAC is developed based on the Langmuir adsorption. We measure interdiffusive flow rates of water vapour in atmospheric air for the first time using the mass loss method and compare experimental results with ideal gas interdiffusive flow theory. We find interdiffusive flows of water vapour in air agree with the theory except for the case where water vapour partial pressures are close to the saturation pressure. Liquid or two-phase flow causes an enhancement of the interdiffusive flow by up to three orders of magnitude. Using the available theories we predict the dominant flow types as a function of channel diameter and make recommendations on the moisture hermeticity testing in devices.
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Neumann, Philipp [Verfasser]. "Hybrid Multiscale Simulation Approaches for Micro- and Nanoflows / Philipp Neumann." München : Verlag Dr. Hut, 2013. http://d-nb.info/104287817X/34.

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Yang, Xiaomin. "Development of multimodal nanoplatforms to improve the performances of radiotherapy and evaluation of the impact of nanoparticles on proteins A Facile One-Pot Synthesis of Versatile PEGylated Platinum Nanoflowers and Their Application in Radiation Therapy Human serum albumin in the presence of AGuIX nanoagents: Structure stabilisation without direct interaction Green one-step synthesis of medical nanoagents for advanced radiation therapy. Advanced Healthcare Materials." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASS091.

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La radiothérapie est utilisée pour 50% des traitements contre le cancer. Cependant, sa mise en œuvre est limitée par la tolérance des tissus sains. De nouvelles stratégies associant nanomédecine et radiothérapie anticancéreuse ont été proposées il y a une dizaine d'années pour améliorer les performances des traitements. Un intérêt croissant est apparu pour les nanoparticules (NP) de Z élevé faites de métal en tant que radio-amplificateurs potentiels, pour augmenter les effets des radiations,Dans la première partie de mon travail, une méthode de radiolyse efficace et unique a été optimisée pour produire en une seule étape, de petites NPs de platine PEGylées dispersées dans une solution stérile, avec un rendement de production de 100%. Ces NP amplifient les effets des rayonnements comme les rayons γ et en particulier les faisceaux de particules. Cependant, la fonctionnalisation de surface de ces NP revêtues de PEGOH est difficile. Dans une deuxième étape, la même méthode de radiolyse a été utilisée pour produire d'autres NP à base de platine enrobées de PEG diamine. Ce revêtement permet de greffer diverses molécules telles que des marqueurs fluorescents, des médicaments ou des radionucléides. Ces particules PEGylées s'agrègent pour donner une forme de nanofleur. Elles peuvent être lyophilisées, ce qui garantit un stockage long et facile. Après caractérisation physico-chimique, leur efficacité en tant que radio-amplificateur a été évaluée in vitro. Des expériences à l'échelle moléculaire utilisant des plasmides comme biosondes moléculaires ont montré que ces NP amplifient l'induction de biodommages complexes. Nous avons attribué l'amplification de ces dommages aux processus physico-chimiques.En outre, la compatibilité sanguine des NP administrés par voie intraveineuse est également cruciale pour leur utilisation en nanomédecine. L'interaction avec les protéines en particulier peut provoquer des effets nocifs potentiels. Par conséquent, la caractérisation de l'impact des NP sur les protéines sanguines est une première étape dans la prévention de la toxicité et des effets indésirables. La deuxième partie de mon travail était consacrée au développement d'une nouvelle méthode multiparamétrique pour caractériser les changements structurels et de stabilité de l'albumine sérique humaine lors de l'interaction avec des nanoagents. Il a ainsi été constaté que les NP à base de gadolinium (AGuIX®) et les NP à base de platine ne se lient pas aux protéines. Fait intéressant, ils stabilisent la structure des protéines en raison d'un mécanisme d’hydratation.Enfin, l'utilisation des NP comme agents de contrastes multimodaux pour sonder la biodistribution in vivo et la pharmacocinétique a été explorée dans la troisième partie de ma thèse. Les NP de platine se sont révélées non seulement des radio-amplificateurs efficaces mais, grâce à leur coefficient d'atténuation des rayons X élevé, également un agent de contraste potentiel pour l'imagerie par tomodensitométrie (TDM). Plus intéressant encore, les NP à terminaison amine développées dans mon travail ont été fonctionnalisées avec succès avec des radionucléides. Cela a ouvert l'opportunité de les observer par imagerie par tomographie par émission de positons (TEP). Les expériences préliminaires de biodistribution ont montré une clairance hépatique et une accumulation des NP dans la tumeur persistant après plusieurs jours.En conclusion, les principaux résultats de mon travail comprennent l'optimisation d'une méthode rapide et efficace pour produire facilement et rapidement des solutions stériles de radio-amplificateurs multimodaux à base de platine qui peuvent également être détecté par TDM, TEP et fluorescence. De plus, il comprend le développement d'une nouvelle façon d'évaluer l'impact des NP sur les protéines sanguines avant les tests in vivo. Ces deux réalisations devraient contribuer à renforcer la stratégie combinant nanomédecine et radiothérapies
Radiotherapy is used for 50% of the cancer treatments. However, its implementation is limited by the tolerance of healthy tissues. New strategies combining nanomedicine and cancer radiation therapy have been proposed a decade ago to improve the performances of the treatments. Hence, a growing interest appeared for high-Z metal-based nanoparticles (NPs) as potential radio-enhancers, to amplify the effects of radiations.In the first part of my work, an efficient and unique radiolysis method was optimized to produce in one step, small, PEGOH-coated platinum NPs dispersed in a sterile solution, with 100% production rate. These NPs are good radio-enhancers, they amplify the radiation effects of γ-rays and particularly particle beams. However, further surface functionalization of these NPs coated with PEGOH is challenging. In a second step, the same radiolysis method was used to produce other platinum-based NPs coated with PEG diamine. This coating allows grafting of various molecules such as fluorescent markers, drugs or radionuclides. These particles aggregate with a shape of nanoflowers. They can be lyophilized, which ensures long and easy storage, and facile reconstitute with different biological buffers. After physico-chemical characterization, their efficiency as radio-enhancers has been evaluated in vitro. Molecular scale experiments using plasmids as molecular bioprobes showed that these NPs amplify the induction of complex biodamage. We ascribed the amplification of the damage to the activating radiation induced physico-chemical processes.Moreover, blood compatibility of NPs when administered intravenously, is also crucial for their use in nanomedicine. The interaction of NPs with proteins especially, can cause potential harmful effects. Hence, the characterization of the impact of NPs on blood proteins, is a first step in the prevention of adverse effects. The second part of my work was dedicated to the development of a new multiparametric method to characterize the structural and stability changes of human serum albumin upon interaction with nanoagents. It was found that gadolinium-based NPs (AGuIX) and platinum-based NPs do not bind to proteins. Interestingly, they stabilize the protein structure due to preferential hydration mechanism. Finally, the use of NPs as multimodal contrasts agents to probe in vivo biodistribution and pharmacokinetic, was explored in the third part of my thesis. Platinum NPs were found to be not only efficient radio-enhancers but, thanks to their high x-ray attenuation coefficient, also potential contrast agent for computed tomography (CT) imaging. More interestingly, the amine-terminated NPs developed in my work were successfully functionalized with radionuclides. This opened an opportunity to observe them by positron emission tomography (PET) imaging, The preliminary biodistribution experiments performed with CT and PET techniques showed hepatic clearance and accumulation of the NPs in the tumor after several days.In conclusion, the major outputs of my work include the optimization of a rapid and efficient method to easily and rapidly produce sterile solutions of multimodal platinum-based radio-enhancers which can be detected by CT, PET and fluorescence imaging. Moreover, it includes the development of a new way to evaluate the impact of NPs on blood proteins prior to in vivo tests. These two achievements will hopefully contribute to boost the strategy of combining nanomedicine and radiation therapies
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Chamberlin, Ryan Earl. "A three-dimensional direct simulation Monte Carlo methodology on unstructured Delaunay grids with applications to micro and nanoflows." Worcester, Mass. : Worcester Polytechnic Institute, 2007. http://www.wpi.edu/Pubs/ETD/Available/etd-032907-092912/.

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Kuo, Po-Yu, and 郭柏佑. "Sythesis and determination of Fe2P nanorods and nanoflowers." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/54330261449586158357.

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碩士
國立成功大學
化學工程學系碩博士班
97
Iron phosphide nanorods and nanoflowers with size distributions were prepared by the multiple injections of organometallic precursor into hot surfactants via the thermal decomposition. The injections of iron pentacarboxyl (Fe(CO)5) dissolved in trioctylphosphine (TOP) into the mixture of trioctylphosphine (TOP), didodecyldimethylammonium bromide (DDAB), and spherical Fe3O4 seeds (~5.5nm) at 300oC, under argon atmosphere. Nanorods, analyzed through scanning electron microscope (SEM) and transmission electron microscope (TEM), with different aspect ratios from 4 to 30 can be prepared by using multiple injections under constant total reactant concentration and reaction time, and the increasing number of injections with the increase of aspect ratios. The size of nanoflowers also increases with the increasing number of injections. Besides,nanorods assembled at TEM grids caused by the surface tension of surfactants probably. Furthermore, the effect of reactant concentration, reaction time and temperature on the synthesis of nanorods was discussed comprehensively. X-ray diffractometer spectrometer (XRD) and superconducting quantum interference device (SQUID) were used to characterize the crystallization and magnetization of the iron phosphide nanorods according to the effect of morphology of the rods. Finally, we presumed a reasonable growth mechanism and determined the magnetism of nanorods, and identified the blocking temperature (TB) of the rods as a function of the length of the rods. Fe2P nanoparticles were prepared from Fe3O4 seeds via multiple injections and seed-mediated growth successfully. Compared with the past syntheses, it’s more alternative and effective on our study to control the shape and size distributions of particles in one synthetic process, and more potential on researches and applications of magnetic properties.
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Wu, Mei Hsuan, and 吳美萱. "Single- and Few-Layers MoSe2 Nanoflowers: Synthesis, Characterization, and Their Piezoresponse." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/29099612086988157311.

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Books on the topic "Nanoflowers"

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Antman, S. S., J. E. Marsden, and L. Sirovich, eds. Microflows and Nanoflows. New York: Springer-Verlag, 2005. http://dx.doi.org/10.1007/0-387-28676-4.

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Rudyak, Valery Ya, Vladimir M. Aniskin, Anatoly A. Maslov, Andrey V. Minakov, and Sergey G. Mironov. Micro- and Nanoflows. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-75523-6.

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Maslov, Anatoly A., Valery Ya Rudyak, Vladimir M. Aniskin, Andrey V. Minakov, and Sergey G. Mironov. Micro- and Nanoflows: Modeling and Experiments. Springer, 2018.

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Maslov, Anatoly A., Valery Ya Rudyak, Vladimir M. Aniskin, Andrey V. Minakov, and Sergey G. Mironov. Micro- and Nanoflows: Modeling and Experiments. Springer, 2018.

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Microflows and Nanoflows: Fundamentals and Simulation (Interdisciplinary Applied Mathematics). Springer, 2005.

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Microflows and Nanoflows: Fundamentals and Simulation (Interdisciplinary Applied Mathematics Book 29). Springer, 2006.

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Book chapters on the topic "Nanoflowers"

1

Aggarwal, Neha, Shibin Krishna, and Govind Gupta. "GaN Nanoflowers." In 21st Century Nanoscience – A Handbook, 8–1. Boca Raton, Florida : CRC Press, [2020]: CRC Press, 2020. http://dx.doi.org/10.1201/9780429351617-8.

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Niraula, Gopal, Mohan Chandra Mathpal, Edher Z. Herrera, Maria A. G. Soler, Jose A. H. Coaquira, and Surender K. Sharma. "Magnetic Nanoflowers: Synthesis, Formation Mechanism and Hyperthermia Application." In Topics in Mining, Metallurgy and Materials Engineering, 129–66. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-79960-1_6.

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Khalid, N. S., W. S. WanZaki, and M. K. Ahmad. "Growth of Rutile Phased Titanium Dioxide (TiO2) Nanoflowers for HeLa Cells Treatment." In IFMBE Proceedings, 243–46. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-11776-8_59.

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Irtiqa, Syed, and Atikur Rahman. "Structural and Photocatalytic Studies of Ce and Dy Co-doped ZnO Nanoflowers." In Advances in Sustainability Science and Technology, 765–77. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-4321-7_62.

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Rudyak, Valery Ya, Vladimir M. Aniskin, Anatoly A. Maslov, Andrey V. Minakov, and Sergey G. Mironov. "Modeling of Nanoflows." In Micro- and Nanoflows, 185–215. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-75523-6_5.

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Rudyak, Valery Ya, Vladimir M. Aniskin, Anatoly A. Maslov, Andrey V. Minakov, and Sergey G. Mironov. "Methods of Modeling of Microflows and Nanoflows." In Micro- and Nanoflows, 1–56. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-75523-6_1.

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Rudyak, Valery Ya, Vladimir M. Aniskin, Anatoly A. Maslov, Andrey V. Minakov, and Sergey G. Mironov. "Gas-Dynamic Structure and Stability of Gas Microjets." In Micro- and Nanoflows, 57–96. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-75523-6_2.

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Rudyak, Valery Ya, Vladimir M. Aniskin, Anatoly A. Maslov, Andrey V. Minakov, and Sergey G. Mironov. "Fluid Flows in Microchannels." In Micro- and Nanoflows, 97–125. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-75523-6_3.

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Rudyak, Valery Ya, Vladimir M. Aniskin, Anatoly A. Maslov, Andrey V. Minakov, and Sergey G. Mironov. "Modeling of Micromixers." In Micro- and Nanoflows, 127–84. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-75523-6_4.

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Rudyak, Valery Ya, Vladimir M. Aniskin, Anatoly A. Maslov, Andrey V. Minakov, and Sergey G. Mironov. "Fluid Transport Under Confined Conditions." In Micro- and Nanoflows, 217–36. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-75523-6_6.

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Conference papers on the topic "Nanoflowers"

1

Khan, Talha Farooq, Mohsin Muhyuddin, Syed Wilayat Husain, and Muhammad Abdul Basit. "Synthesis and Characterization of ZnO-ZnS Nanoflowers for Enhanced Photocatalytic Performance : ZnS Decorated ZnO Nanoflowers." In 2019 16th International Bhurban Conference on Applied Sciences and Technology (IBCAST - 2019). IEEE, 2019. http://dx.doi.org/10.1109/ibcast.2019.8667220.

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Rihtnesberg, David B., Susanne Almqvist, Qin Wang, Abhilash Sugunan, Xuran Yang, Muhammet S. Toprak, Zahra Besharat, and Mats Gothelid. "ZnO nanorods/nanoflowers and their applications." In 2011 IEEE 4th International Nanoelectronics Conference (INEC). IEEE, 2011. http://dx.doi.org/10.1109/inec.2011.5991615.

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Tong, Junhua, and Tianrui Zhai. "Random Lasers based on Polymer Membranes with Silver Nanoflowers." In Frontiers in Optics. Washington, D.C.: OSA, 2018. http://dx.doi.org/10.1364/fio.2018.jtu2a.91.

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Acharyya, D., S. Ghosal, R. Roychaudhuri, and P. Bhattacharyya. "Hierarchical MnO2 Nanoflowers Based Efficient Room Temperature Alcohol Sensor." In 2018 IEEE Sensors. IEEE, 2018. http://dx.doi.org/10.1109/icsens.2018.8589597.

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Maity, Indranil, and Partha Bhattacharyya. "Potentiallity of Surface Modified TiO2 Nanoflowers for Alcohol Sensing Application." In 2019 2nd International Symposium on Devices, Circuits and Systems (ISDCS). IEEE, 2019. http://dx.doi.org/10.1109/isdcs.2019.8719089.

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Li, Yunhan, Shruti Nambiar, Yonghai Sun, Chintamani N. R. Rao, and John T. W. Yeow. "Experimental study on field emission performance of bismuth sulfide nanoflowers." In 2014 IEEE 14th International Conference on Nanotechnology (IEEE-NANO). IEEE, 2014. http://dx.doi.org/10.1109/nano.2014.7133074.

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Ross, Benjamin M., Liz Y. Wu, and L. P. Lee. "Plasmonic nanoflowers: bioinspired manipulation of plasmonic architectures via active polymers." In SPIE NanoScience + Engineering, edited by Raul J. Martin-Palma and Akhlesh Lakhtakia. SPIE, 2009. http://dx.doi.org/10.1117/12.826808.

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Praveen, B., E. Merlin Arnold, K. Pugazhendhi, S. Padmaja, D. J. Sharmila, and J. Merline Shyla. "Novel perovskite nanoflowers sensitized TiO2 photo anode for proficient PSCs." In DAE SOLID STATE PHYSICS SYMPOSIUM 2018. AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5113435.

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Silambarasan, A., H. P. Kavitha, S. Ponnusamy, M. Navaneethan, and Y. Hayakawa. "Chemical synthesis of ZnS nanoflowers using biomolecule and optical properties." In 2012 International Conference on Solid State Devices and Materials. The Japan Society of Applied Physics, 2012. http://dx.doi.org/10.7567/ssdm.2012.ps-8-4.

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Das, Abinash, Manoj Hazarika, and Ranjith G. Nair. "Synthesis and characterization of ZnO nanoflowers as an efficient solar photocatalyst." In PROF. DINESH VARSHNEY MEMORIAL NATIONAL CONFERENCE ON PHYSICS AND CHEMISTRY OF MATERIALS: NCPCM 2018. Author(s), 2019. http://dx.doi.org/10.1063/1.5098650.

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