Log in

Relevant bibliographies by topics / Fe3O4 / Dissertations / Theses

To see the other types of publications on this topic, follow the link: Fe3O4.

Dissertations / Theses on the topic 'Fe3O4'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 dissertations / theses for your research on the topic 'Fe3O4.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.

1

Rodrigues, Marcos Renan Flores. "Estudo e caracterização de nanopartículas de Fe3O4, Fe2O3, Fe3O4/ Aunanop E Fe2O3/Aunanop." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2017. http://hdl.handle.net/10183/184573.

Full text

Abstract:

Nanopartículas de Fe3O4 e Fe2O3 foram sintetizadas a partir da rota de coprecipitação, em atmosfera de N2, mantendo-se o pH entre 9 e 14 na temperatura ambiente e utilizando como precursores o FeCl2 e FeCl3. Após a síntese, as nanopartículas foram tratadas termicamente a 250, 500 e 800 oC. Para obtenção de um sistema híbrido, foram sintetizadas nanopartículas de ouro sobre as nanopartículas de óxido previamente tratadas em diferentes temperaturas. As amostras foram caracterizadas por UV-Vis, difratometria de Raios-X (DRX), microscopia eletrônica de transmissão (MET), microscopia eletrônica de

APA, Harvard, Vancouver, ISO, and other styles

2

Nunes, Eloiza da Silva [UNESP]. "Preparação e caracterização de nanocompósitos de Fe@SiO2, Fe@Fe3O4 e Fe3O4@PNIPAM." Universidade Estadual Paulista (UNESP), 2015. http://hdl.handle.net/11449/124538.

Full text

Abstract:

Made available in DSpace on 2015-07-13T12:10:33Z (GMT). No. of bitstreams: 0 Previous issue date: 2015-02-05. Added 1 bitstream(s) on 2015-07-13T12:24:08Z : No. of bitstreams: 1 000826270_20160205.pdf: 226859 bytes, checksum: 619f39d8f546393cad7cff3abb1a91cb (MD5) Bitstreams deleted on 2016-02-05T13:56:02Z: 000826270_20160205.pdf,. Added 1 bitstream(s) on 2016-02-05T13:56:44Z : No. of bitstreams: 1 000826270.pdf: 25046020 bytes, checksum: fb29338aa8631d88b7bca10a5d22a9be (MD5)<br>Neste trabalho foi investigada a obtenção de nanopartículas de ferro metálico em diferentes meios não aquosos

APA, Harvard, Vancouver, ISO, and other styles

3

Cláudia, Vaz de Araújo Ana. "Síntese de nanopartículas de Fe3O4, nanocompósitos de Fe3O4 com polímeros e materiais carbonáceos." Universidade Federal de Pernambuco, 2011. https://repositorio.ufpe.br/handle/123456789/9226.

Full text

Abstract:

Made available in DSpace on 2014-06-12T23:13:41Z (GMT). No. of bitstreams: 2 arquivo3113_1.pdf: 4832210 bytes, checksum: b68ee8eea631e7317ec09c0f8f995567 (MD5) license.txt: 1748 bytes, checksum: 8a4605be74aa9ea9d79846c1fba20a33 (MD5) Previous issue date: 2011<br>Universidade Federal Rural de Pernambuco<br>Nanopartículas magnéticas de Fe3O4 foram sintetizadas através do método da precipitação a partir de uma solução aquosa de sulfato ferroso, sob ultrassom. Um planejamento fatorial 23 em duplicata foi desenvolvido para determinar as melhores condições de síntese e obter o menor tamanho de

APA, Harvard, Vancouver, ISO, and other styles

4

Jesus, Ana Carla Batista de. "Síntese e caracterização de nanoestruturas Fe3O4 e Fe3O4@Ag para estudos com hipertermia magnética." Pós-Graduação em Física, 2018. http://ri.ufs.br/jspui/handle/riufs/8037.

Full text

Abstract:

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES<br>Fundação de Apoio a Pesquisa e à Inovação Tecnológica do Estado de Sergipe - FAPITEC/SE<br>In this work we have performed a study of the structural and magnetic properties in Fe3o4@Agx nanostructures (x=0,1,5 and 10%), synthesized by thermal decomposition (DT) and co-precipitation (CP). The samples were characterized by measurements of X-ray diffraction (XRD) and transmission electron microscopy (TEM). The XRD patterns indicate the presence of the Fe3o4 and Ag phase. The mean crystallites size corresponding to the Fe3o4 est

APA, Harvard, Vancouver, ISO, and other styles

5

Matos, Izabela Teles de. "Caracterização em escala atômica de nanopartículas magnéticas de magnetita e ferrita do tipo TMFe2O4 (TM = Co, Ni) para uso em biomedicina pela espectroscopia de correlação angular gama-gama perturbada." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/85/85131/tde-30012019-144245/.

Full text

Abstract:

Este trabalho descreve, sob um ponto de vista atômico, a investigação das nanopartículas magnéticas (NPMs) de magnetita (Fe3O4) e ferritas do tipo TMFe2O4 (TM = Co, Ni), que são uma classe de materiais estruturados que atualmente tem um grande interesse devido à grande variedade de suas possíveis aplicações tecnológicas e biomédicas, pela Espectroscopia de Correlação Angular γ-γ Perturbada (CAP). Para a produção das NPMs foram utilizadas duas rotas químicas: o método de co-precipitação e o método de decomposição térmica. A co-precipitação apresenta as vantagens de ter temperaturas

APA, Harvard, Vancouver, ISO, and other styles

6

Ballesteros, Camilo Arturo Suarez. "Síntese e caracterização de nanopartículas Fe3O4@Au e desenvolvimento de sensores para aplicações em nanomedicina." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/76/76132/tde-23102012-101205/.

Full text

Abstract:

Com o desenvolvimento de novos nanomateriais têm-se descoberto propriedades eletrônicas, elétricas, ópticas e catalíticas únicas para aplicações nanotecnológicas. Entre estes nanomateriais com caraterísticas singulares, estão as nanopartículas (Np) CoreαShell, as quais combinam propriedades físico-químicas de dois materiais diferentes, provendo maior eficiência em aplicações como nanoeletrônica, sensoreamento, biossensoreamento e biomédicas. Neste trabalho, Np CoreαShell são sintetizada com núcleo (Core) de Np Fe₃O₄ e com casca (Shell) de Np Au, formando as Nps Fe&#8323

APA, Harvard, Vancouver, ISO, and other styles

7

Huet, Sarah Damasceno Pinheiro. "Estudo das interações hiperfinas em nanopartículas de Fe3O4 e Fe3O4 dopadas com gadolínio pela espectroscopia de correlação angular perturbada." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/85/85131/tde-20062014-132040/.

Full text

Abstract:

Neste trabalho foram estudadas as nanopartículas magnéticas (NPs) de interesse em biomedicina de Fe3O4 e de Fe3O4 dopadas com Gd 5% pela técnica de Espectroscopia de correlação angular gama-gama perturbada (CAP). As amostras de Fe3O4 foram sintetizadas pelos métodos de co-precipitação e decomposição térmica e as nanopartículas de Fe3O4 dopadas com Gd 5% foram sintetizadas pelo método da coprecipitação. As amostras de nanoparticulas foram caracterizadas quanto a sua estrutura pela difração de raios X (DRX) e quanto ao seu tamanho pela técnica de microscopia eletrônica de transmissão (TEM). Os r

APA, Harvard, Vancouver, ISO, and other styles

8

Bataille, Alexandre. "Etude des propriétés physiques des films de Fe3O4 et de la polarisation en spin à l'interface Fe3O4/gamma-Al2O3." Paris 11, 2005. https://tel.archives-ouvertes.fr/tel-00085941.

Full text

Abstract:

La magnétite Fe3O4 est un matériau prometteur pour l'électronique de spin, puisque des calculs de structure de bande la prédisent demi-métallique, c'est à dire totalement polarisée en spin au niveau de Fermi. Nous avons fait croître des films minces de Fe3O4 de 3 à 50 nm d'épaisseur sur γ-Al2O3 par épitaxie par jets moléculaires. Les films sont monocristallins mais présentent un grand nombre de parois d'antiphase qui sont responsables des anomalies magnétiques observées. Nous avons reproduit le comportement magnétique des films à l'aide d'un modèle unidimensionnel et confronté les résultats av

APA, Harvard, Vancouver, ISO, and other styles

9

Bataille, Alexandre. "Etude des propriétés physiques des films de Fe3O4 épitaxiés et de la polarisation en spin à l'interface Fe3O4/γ-Al2O3". Phd thesis, Université Paris Sud - Paris XI, 2005. http://tel.archives-ouvertes.fr/tel-00085941.

Full text

Abstract:

La magnétite Fe3O4 est un matériau prometteur pour l'électronique de spin, puisque des calculs de structure de bande la prédisent demi-métallique, ce qui laisse supposer des effets de magnétorésistance importants pour des jonctions tunnel magnétiques utilisant Fe3O4 comme électrode. Nous avons fait croître des films minces de Fe3O4 de 3 à 50 nm d'épaisseur sur α-Al2O3 par épitaxie par jets moléculaires. Les films sont monocristallins mais contiennent des parois d'antiphase. Celles-ci sont responsables des anomalies magnétiques observées sur les films, que nous avons pu reproduire à l'aide d'un

APA, Harvard, Vancouver, ISO, and other styles

10

Lima, Bruno Henrique Ramos de. "Nanopartículas de Fe3O4 funcionalizadas e nanocompósitos de base epóxi." Universidade Federal de São Carlos, 2015. https://repositorio.ufscar.br/handle/ufscar/7452.

Full text

Abstract:

Submitted by Livia Mello (liviacmello@yahoo.com.br) on 2016-09-23T20:30:03Z No. of bitstreams: 1 TeseBHRL.pdf: 7635234 bytes, checksum: ace0e64e8d66b9fe47a96a9167d61810 (MD5)<br>Approved for entry into archive by Marina Freitas (marinapf@ufscar.br) on 2016-09-26T20:34:16Z (GMT) No. of bitstreams: 1 TeseBHRL.pdf: 7635234 bytes, checksum: ace0e64e8d66b9fe47a96a9167d61810 (MD5)<br>Approved for entry into archive by Marina Freitas (marinapf@ufscar.br) on 2016-09-26T20:34:59Z (GMT) No. of bitstreams: 1 TeseBHRL.pdf: 7635234 bytes, checksum: ace0e64e8d66b9fe47a96a9167d61810 (MD5)<br>Made availab

APA, Harvard, Vancouver, ISO, and other styles

11

León, Félix Lizbet. "Síntese e caracterização de nanopartículas de Fe3O4 recobertas com ouro." reponame:Repositório Institucional da UnB, 2013. http://repositorio.unb.br/handle/10482/13862.

Full text

Abstract:

Dissertação (mestrado)—Universidade de Brasília, Instituto de Física, Programa de Pós-Graduação do Instituto de Física 2013.<br>Submitted by Alaíde Gonçalves dos Santos (alaide@unb.br) on 2013-07-30T11:02:07Z No. of bitstreams: 1 2013_LizbetLeonFelix.pdf: 5332833 bytes, checksum: f874a7a7685d11a86addb686007d9a6e (MD5)<br>Approved for entry into archive by Guimaraes Jacqueline(jacqueline.guimaraes@bce.unb.br) on 2013-08-05T15:42:11Z (GMT) No. of bitstreams: 1 2013_LizbetLeonFelix.pdf: 5332833 bytes, checksum: f874a7a7685d11a86addb686007d9a6e (MD5)<br>Made available in DSpace on 2013-08-05T15

APA, Harvard, Vancouver, ISO, and other styles

12

Демчук, В. Б., В. А. Сидлецкий та В. А. Мащенко. "Влияние магнитного поля на электрические свойства ПВХ, наполненного дисперсным Fe3O4". Thesis, Издательство СумГУ, 2012. http://essuir.sumdu.edu.ua/handle/123456789/27577.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

Monnington, Amy Elizabeth. "Modelling magnetite biomineralisation : the interactions of proteins and Fe3O4 surfaces." Thesis, University of Huddersfield, 2014. http://eprints.hud.ac.uk/id/eprint/23448/.

Full text

Abstract:

The biosynthesis of magnetite is the earliest known example of biomineralisation; how-ever, much of the detailed atomistic mechanisms by which the process occurs are unknown. Within the bacterial strain Magnetospirillum magneticum AMB-1, the formation of mag-netite nanoparticles is thought to occur under the inﬂuence of the Mms6 protein. The C–terminal of this protein is highly acidic, containing dense carboxyl and hydroxyl groups, and exhibits direct interaction with the magnetite surface. In this thesis, a novel atomistic model of Mms6-driven magnetite formation was developed and the interac

APA, Harvard, Vancouver, ISO, and other styles

14

Liong, Silvia. "A Multifunctional Approach to Development, Fabrication, and Characterization of Fe3O4 Composites." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/7640.

Full text

Abstract:

A unique approach for lightweight multifunctional composites was developed using Fe3O4 nanoparticles and polypyrrole-coated Fe3O4 particles as fillers. Fe3O4 particles are a good candidate for filler in a multifunctional composite system because they can reinforce mechanical properties of a polymer matrix and impart magnetic properties into a composite. Polypyrrole coating on Fe3O4 particles was utilized to incorporate electrical conductivity to the properties of composites. The effects of filler size and filler content were studied on both the mechanical and electromagnetic properties. Fe

APA, Harvard, Vancouver, ISO, and other styles

15

Bradley, Ruth. "Optimisation of Fe3O4 thin films and nanostructures for atom trapping applications." Thesis, University of Sheffield, 2017. http://etheses.whiterose.ac.uk/19747/.

Full text

Abstract:

Thin films and nanostructures of Fe3O4 have been investigated and analysed with the aim of being used for an exciting application where the stray magnetic field from domain walls in nanowires are used to trap ultra-cold atoms. In this thesis, polycrystalline Fe3O4 thin films have been successfully grown on Si using reactive dc magnetron sputtering from a Fe target. It has been shown that by using different growth temperatures produces different iron oxide phases. Fe3O4 was grown at substrate temperatures of 200 – 500 ºC with a mixed iron oxide phase of Fe3O4 & α-Fe2O3 produced at RT & 100 ºC.

APA, Harvard, Vancouver, ISO, and other styles

16

MONSALVE, Johanna Gil. "Oscilação da magnetização em nanocompósitos de Fe3O4/PANI e γFe2O3/PANI". Universidade Federal de Pernambuco, 2017. https://repositorio.ufpe.br/handle/123456789/22658.

Full text

Abstract:

Submitted by Rafael Santana (rafael.silvasantana@ufpe.br) on 2017-12-21T18:46:39Z No. of bitstreams: 2 license_rdf: 811 bytes, checksum: e39d27027a6cc9cb039ad269a5db8e34 (MD5) Johanna Gil Monsalve-Mestrado em Física-2017.pdf: 10870901 bytes, checksum: 67643f5c7354715fef750e27e8a09257 (MD5)<br>Made available in DSpace on 2017-12-21T18:46:39Z (GMT). No. of bitstreams: 2 license_rdf: 811 bytes, checksum: e39d27027a6cc9cb039ad269a5db8e34 (MD5) Johanna Gil Monsalve-Mestrado em Física-2017.pdf: 10870901 bytes, checksum: 67643f5c7354715fef750e27e8a09257 (MD5) Previous issue date: 2017-02-15<br>Estu

APA, Harvard, Vancouver, ISO, and other styles

17

Schäfer, Thaynara Marjô Zanette. "Síntese, caracterização e aplicação de nanopartículas de óxido de ferro (Fe3O4)." Universidade Estadual do Oeste do Paraná, 2017. http://tede.unioeste.br/handle/tede/3266.

Full text

Abstract:

Submitted by Marilene Donadel (marilene.donadel@unioeste.br) on 2018-01-23T17:09:40Z No. of bitstreams: 1 Thaynara_Schafer_2017.pdf: 1932282 bytes, checksum: 89dd37a8b10b1470458f461465755dfc (MD5)<br>Made available in DSpace on 2018-01-23T17:09:40Z (GMT). No. of bitstreams: 1 Thaynara_Schafer_2017.pdf: 1932282 bytes, checksum: 89dd37a8b10b1470458f461465755dfc (MD5) Previous issue date: 2017-11-20<br>The textile industries present a high polluting potential, due to the generation of large volumes of liquid waste, containing high organic load and strong coloration derived from the dyes. These

APA, Harvard, Vancouver, ISO, and other styles

18

Shen, Ming-Zong, and 沈明宗. "Synthesis of Fe3O4，Fe3O4/SiO2，Fe3O4/TiO2 nano-particles and Its Applications." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/73914817140382431947.

Full text

Abstract:

碩士<br>中原大學<br>化學研究所<br>95<br>Synthesis of Fe3O4 magnetic nanoparticles is carried out by microwave hydrothermal method. The size of Fe3O4 magnetic nanoparticles is controlled by changing solution’s concentration. We have prepared the Fe3O4/SiO2 Core/shell nanoparticles by using Stober process. In this study, Fe3O4 magnetic nanoparticles prepared by microwave hydrothermal method and is used for disposable glucose biosensor. The advantages such as excellent biocompatibility, low toxicity, superparamagnetic and biocatalytic properties of Fe3O4 nanoparticles was expected to increase electrode’s a

APA, Harvard, Vancouver, ISO, and other styles

19

BERARDI, GINEVRA. "Multitasking Fe3O4@Cu@Au and Fe3O4@SiO2 nanoparticles for biomedical applications." Doctoral thesis, 2018. http://hdl.handle.net/11573/1215256.

Full text

Abstract:

Tra i nanomateriali utili in ambito biomedico, le nanoparticelle di magnetite offrono grandi vantaggi sia in campo diagnostico che terapeutico, permettendo di combinare le loro peculiari proprietà magnetiche con le note proprietà chimico fisiche che caratterizzano le nanoparticelle. Realizzando una struttura core-shell e funzionalizzando la superficie della nanoparticella con sostanze biologicamente o farmacologicamente attive, è possibile, da un lato, conservare le proprietà superparamagnetiche del nucleo e, dall'altro, ottenere nanosistemi multifunzionali più selettivi e/o efficaci nei confr

APA, Harvard, Vancouver, ISO, and other styles

20

Jian, Chung-Chin, and 簡崇欽. "Magnetic Tunneling Effect in Co/CoO/Fe3O4 and Fe3O4/AlOx/Co Junctions." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/79838508059773261672.

Full text

Abstract:

碩士<br>國立臺灣大學<br>物理學研究所<br>92<br>Abstract Magnetic trilayer junctions(MTJs) based on half metallic oxides have attracted much attention because of their potential in memory and logic device applications. Among half metallic materials, the magnetite(Fe3O4) is the most promising candidate due to its high ferrimagnetic Curie temperature(~856K). And an enhanced TMR effect has been expected for this sort of MTJ. However, up to now, the MR effect of MTJ with Fe3O4 as an electrode has been found to be negligibly small. Several causes have been speculated to explain the reduction. For exampl

APA, Harvard, Vancouver, ISO, and other styles

21

MING, CHANG WEN, and 張文明. "Spin injection and accumulation in Au-Fe3O4 and Cu-Fe3O4 composite films." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/46165833493804300612.

Full text

Abstract:

碩士<br>國立臺灣大學<br>物理學研究所<br>90<br>Abstract The magnetoresistance effect have been investigated in Au-Fe3O4 and Cu-Fe3O4 and compared with the results of Ag-Fe3O4. It has been found that in addition to the contribution of GMR from Fe3O4 and OMR from metal the spin injection and accumulation is the dominant factor that determines the MR value. The films were prepared by the dc magnetron sputtering with the substrate temperature set at 340℃ during sputtering. The film structure was determined from X-ray diffraction. The results indicate that the film essentially contains fcc p

APA, Harvard, Vancouver, ISO, and other styles

22

Lin, Shih-che, and 林士哲. "Magnetic Compensation and Interfacial Coupling in Ferrimagnetic Spinel Oxide Fe3O4/Mn3O4/Fe3O4 Trilayers." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/41584184823177976691.

Full text

Abstract:

碩士<br>國立中正大學<br>物理所<br>98<br>Fe3O4 and Mn3O4 are the most typical spinel ferrimagnetic oxides. The magnetic coupling between Fe3O4 and Mn3O4 has been studied through superlattices but with relatively smaller length scale of each constituent layer. In this thesis, a Fe3O4/Mn3O4/Fe3O4 trilayered structure on MgO(001), MgO(011) and STO(001) substrates, fabricated by molecular beam epitaxy(MBE), provides a simple system to test the magnetic response to a much larger length scale. These trilayered structure have been also characterized by X-ray diffraction(XRD) and scanning electron microscopy(

APA, Harvard, Vancouver, ISO, and other styles

23

Huang, Ching-Yen, and 黃清彥. "Investigation of Surface Property of Magnetic Nano-particles Fe3O4 and SiO2 Coated with Fe3O4." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/61751160626335530152.

Full text

Abstract:

碩士<br>國立高雄應用科技大學<br>模具工程系碩士班<br>102<br>In this paper, the magnetic nanoparticles of Fe3O4 were prepared with a chemical co-precipitation method. The Fe3+ and Fe2+ solution was mixed with NH4OH by heating and stirring and using N2 to protect the reaction, after that the Fe3O4 magnetic nanoparticles were obtained. Next, the core-shell structures of SiO2 coated with Fe3O4 nanocomposite particles were prepared by sol-gel method, in which the hydrolysis of TEOS was conducted on the surface of Fe3O4 with the aid of basic catalyst at room temperature. In this study, the surface shape and component of

APA, Harvard, Vancouver, ISO, and other styles

24

Ho, Chien-Hsin, and 何建新. "Shape-controlled Synthesis, Characterization, and Applications of Fe3O4 and FePt@Fe3O4 Core-shell Magnetic Nanoparticles." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/00723633832958956225.

Full text

Abstract:

博士<br>國立清華大學<br>材料科學工程學系<br>98<br>摘要本論文主要著重於四氧化三鐵和鐵鉑-四氧化三鐵核殼結構磁性奈米微粒之合成、形狀控制、鑑定、與其應用之研究。首先，我們利用高溫注入前驅物的方法來製備四氧化三鐵的奈米微粒，注射時的反應溶液溫度為290 °C。我們發現溶液中鐵單體的濃度會影響著四氧化三鐵奈米微粒的形狀。當前驅物注射速度只有10 mL/h時，所還原出的有限鐵單體將優先成長於具有較高能量的晶面，而造成具有最低能量的{100}晶面變成主要外露面，最終得到立方體形的奈米微粒。然而，當注射速度增加到20 mL/h時，增加的鐵單體濃度會改變各主要晶面的相對成長速率。因此原本具有第二低能量的{110}晶面，也和{100}晶面一樣變成了主要外露面之一，最後形成了削菱截角立方體(Rhombicuboctahedron)。在我們的實驗中，這兩種四氧化三鐵奈米微粒的粒徑大約都在16奈米左右，並且都可以在TEM銅網上和矽基板上自組裝成具有優選晶體方向的奈米微粒超晶格結構。第二部分的研究主要是製備具由核殼結構的鐵鉑-四氧化三鐵奈米立方體。我們利用上述之高溫注入前驅物的方法搭配晶種成長法，來製備具有球形鐵鉑核和立方體形四氧化三鐵殼的複合式磁性奈米微粒。此複合式奈米微粒的最終形狀主要取決於四氧化三鐵殼的成長條件。並且經由HRTEM的分析可得知，鐵鉑核和四氧化三鐵殼並不

APA, Harvard, Vancouver, ISO, and other styles

25

陳柏安. "Fe3O4/polypyrrole composite for microwave absorption." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/789sq4.

Full text

Abstract:

碩士<br>逢甲大學<br>化學工程學系<br>102<br>Fe3O4 nanoparticles, H-Fe3O4 and C-Fe3O4, were prepared by the hydrothermal and co-precipitation methods, respectively. Microwave absorption properties of composites using polypyrrole encapsulated Fe3O4 by different polypyrrole (Ppy) and carbon nanotube (CNT) content in an epoxy matrix were studied. The composites were characterized by FE-SEM, XRD, FTIR, TEM, magnetic hysteresis loops. For the study of microwave absorption properties, we measured the permittivity and permeability of the composites and simulated their reflection loss (RL) in the frequency ranges

APA, Harvard, Vancouver, ISO, and other styles

26

Hou, T. Y., та 侯宗佑. "[Mn3O4/Fe3O4]與[MgO/Fe3O4]超晶格之製成與磁性分析研究". Thesis, 1999. http://ndltd.ncl.edu.tw/handle/42386400203831573480.

Full text

Abstract:

碩士<br>國立中正大學<br>物理系<br>87<br>The transition metal oxides have been studied for a long time due to their rich electromagnetic properties. Previos studies on oxide systems have been focusing in the anti-ferromagnetic/anti-ferromagnetic (AF/AF) and ferrimagnetic/anti-ferromagnetic (FM/AF)super lattices, such as NiO/CoO and Fe3O4/NiO. We extend the study to the superlattices of high quality [Mn3O4/Fe3O4] and [MgO/Fe3O4] , including the magnetic property. Using plasma-oxygen-assisted molecular beam epitaxy technique, we are able to grow both super lattices [Mn3O4/Fe3O4] and [MgO/Fe3O4] on MgO(100).

APA, Harvard, Vancouver, ISO, and other styles

27

Ho, Mao-Hsun, and 何茂熏. "Preparation and characterization of electrospun Fe3O4/poly(3-hydroxybutyrate) and Fe3O4/poly(3-hydroxybutyrate-co-3-hydroxyvalerate) nanofibers." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/77423046945366981078.

Full text

Abstract:

碩士<br>國立中興大學<br>材料科學與工程學系所<br>100<br>This study is focused on the preparation of Fe3O4/poly(3-hydroxybutyrate) (PHB) and Fe3O4/poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) electrospun fiber containing high porosity and surface area with interconnected pore network. The structure of prepared PHB and PHBV fibers is similar to the dimension of extracellular matrix (ECM). The electrospun Fe3O4/PHB and Fe3O4/PHBV composite fibers were achieved with biocompatibility and magnetic properties. The micrographs of scanning electronic microscopy (SEM) illustrate that the fiber diameter was distribu

APA, Harvard, Vancouver, ISO, and other styles

28

Pei-Lun, Chien, and 簡培倫. "Synthesize and application of Fe3O4 nano particle." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/09666095080904376094.

Full text

Abstract:

碩士<br>中國文化大學<br>材料科學與奈米科技研究所<br>94<br>In this dissertation, the study of synthesize and application of Fe3O4 nano particle the main purpose, divide the application into three following parts. In the first part, nanometer-sized magnetic materials have attracted the attention of many researchers, because magnetic nanoparticles exhibit unusual chemical and physical properties such as superparamagnetism and quantum tunneling of magnetization. A number of techniques, both chemical and physical, have been used to make magnetic particles. In this dissertation, ferrite nanoparticles [magnetite (F

APA, Harvard, Vancouver, ISO, and other styles

29

Chien, Yen-tao, and 錢彥滔. "Synthesis and Characterization of TiO2/Fe3O4 photocatalyst." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/7h27q5.

Full text

Abstract:

碩士<br>明道大學<br>材料科學與工程學系碩士班<br>99<br>Our study is to explore how soluble gel ( Sol-Gel ) preparation TiO2/Fe3O4 Photocatalyst complex to destain Indigo in different content Fe3O4 molal ratio in variation situation, like different OD of Indigo and density of seawater at three color light source LED (blue ,white and red). We also used human brine pathogenic bacteria Edwardsiella tarda to measure TiO 2/Fe3O4 antibiotic activities. The data shows the best destained condition is in 4% Fe3O4 in different OD and 1% Fe3O4 in different density of seawater at blue light source. On marine pathogens Edwar

APA, Harvard, Vancouver, ISO, and other styles

30

Wang, Shi-Yu, and 王世育. "Characterization and Mechanism of Fe3O4/Carbon Supercapacitors." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/54488132506871444616.

Full text

Abstract:

博士<br>國立臺灣大學<br>化學工程學研究所<br>92<br>Composite electrodes which comprise a non-conductive activated carbon of large surface area (1436 m2/g) and a conductive carbon black (CB) of small surface area (220 m2/g) have been prepared and studied for their capacitive properties in aqueous KOH and Na2SO4 electrolytes. For either electrolyte, maximum capacitance exists at the composition believed to correspond to the percolation threshold for CB, the conductive phase. At a CB content less than the threshold, the capacitance is limited mainly by the electronic resistance on the electrode side. The interfac

APA, Harvard, Vancouver, ISO, and other styles

31

Chao, Pei-Yu, and 巢沛禹. "Exosomes purification based on PEG coated Fe3O4." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/02074383761495791195.

Full text

Abstract:

碩士<br>中原大學<br>機械工程研究所<br>104<br>Cancer also known as malignant tumors, is a group of diseases involving abnormal cell growth with the potential to invade or spread to other parts of the body, for many years, cancer is a disease of the highest mortality, over 100 cancers affect humans. When cancer metastasis, cancer cells secretes a kind of microvesicles called “Exosome” to create the microenvironment at the destination. So, if we can detect the quantity of exosomes in human body, perhaps have the opportunity to check out the cancer at an early stage. Exosomes appears in biological fluids like

APA, Harvard, Vancouver, ISO, and other styles

32

Kuo, Ying-Jeng, and 郭英傑. "Synthesis of Ag-Fe3O4 composite nano-particles." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/87441725318289026864.

Full text

Abstract:

碩士<br>中原大學<br>化學研究所<br>96<br>Synthesis of Ag-Fe3O4 magnetic nanoparticles is carried out by coprecipitation method. The size of Ag-Fe3O4 magnetic nanoparticles is controlled by changing solution’s concentration and different preserver. The component and microstructure of Ag-Fe3O4 magnetic nanoparticles was characterized by XRD, UV, TEM, and EDS. The superparamagne- tism of Ag-Fe3O4 magnetic nanoparticles s was confirmed with a VSM. Synthesis of Ag-Fe3O4 magnetic nanoparticles was accomplished in two methods. Method one is Chemical reduction and oxidation. Silver ions were used as oxidation ag

APA, Harvard, Vancouver, ISO, and other styles

33

Kao, Ting-Hsuan, and 高挺軒. "Preparation and properties of Fe3O4/ polybenzoxazine nanocomposites." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/87187316368696727307.

Full text

Abstract:

碩士<br>南亞技術學院<br>材料應用科技研究所<br>99<br>The subject of this study is to develop a novel approach to modify the surface of Fe3O4 nanoparticles and to prepare Fe3O4/polybenzoxazine nanohybrids. Fe3O4 modification as been employed with N-(p-carboxyphenyl) maleimide(p-CPM) through the reaction between the hydroxyl groups of Fe3O4 nanoparticles and the carboxyl groups of p-CPM. The p-CPM modified Fe3O4 nanoparticals (Fe3O4-p-CPM) are then utilized in preparation of Fe3O4 nanopartical-cored star polymers and Fe3O4 nanoparticale/benzoxazine nanohybrides. The chemical structures of the prepared materials h

APA, Harvard, Vancouver, ISO, and other styles

34

Chen, Yi-hsun, and 陳誼勳. "Reaction Behavior of Nanoscale Fe3O4 and [Fe3O4]MgO with Different Inorganic Pollutants (NO3-, Cd2+ and Cr6+) in Simulated Groundwater." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/75374599593178756507.

Full text

Abstract:

碩士<br>國立中山大學<br>環境工程研究所<br>97<br>This study was to investigate the reaction behavior of laboratory-prepared nanoscale adsorbents (Fe3O4 and H-[Fe3O4]MgO) and inorganic pollutants (NO3-, Cd2+and Cr6+) in simulated groundwater. First, Fe3O4 and the composites of nanoscale Fe3O4 and MgO were prepared using chemical co-precipitation method. Then they were characterized and verified by various apparatuses and methods including X-ray diffractometry, scanning electron microscopy, Zetasizer, and specific surface area measurements. Second, the nanoscale adsorbents were used to adsorb inorganic pollu

APA, Harvard, Vancouver, ISO, and other styles

35

Kuschel, Olga. "From initial growth of ultrathin Fe3O4 films up to NiFe2O4 formation through interdiffusion of Fe3O4/NiO bilayers on Nb:SrTiO3(001)." Doctoral thesis, 2020. https://repositorium.ub.uni-osnabrueck.de/handle/urn:nbn:de:gbv:700-202005083040.

Full text

Abstract:

Within this thesis, a comprehensive study of the initial growth process of pure Fe3O4 films and Fe3O4/NiO bilayers on Nb:SrTiO3(001) substrates including the thermal interdiffusion behavior of these bilayers is presented. The sensitive interplay between magnetic, electronic and structural properties of these materials has been investigated in detail. In the first study, the initial growth behavior of high-quality ultrathin magnetite films on SrTiO3(001) deposited by reactive molecular beam epitaxy depending on the deposition temperature has been analyzed. For this purpose, the growth process

APA, Harvard, Vancouver, ISO, and other styles

36

Lee, Chih-Hung, and 李致竑. "The Study of Nylon 6/Fe3O4@Graphene Composites." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/s28s7g.

Full text

Abstract:

碩士<br>國立臺北科技大學<br>有機高分子研究所<br>100<br>The method of ball-milling and oxidation were applied in this study to produce small-sized particle graphene, then the reduction of metal nano-particle was introduced to reduce Fe3O4 onto the graphene surface. By using Scanning Electron Microscope, Energy Dispersive Spectrometer, X-ray Diffractometer and also doing BET analysis, resistivity test and TGA test, we obtained the optimal ratio for Graphene Oxide to FeCl2 is 1 g to 0.5 g. The Fe3O4@Graphene powder at 0.1 wt%, 0.5 wt%, 1 wt%, 2 wt% and 3 wt% were added respectively to Nylon 6 through the in situ

APA, Harvard, Vancouver, ISO, and other styles

37

Cheng, Chun-Yang, and 鄭鈞陽. "Catalytic destruction of isopropanol by microwave/Fe3O4 system." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/50914783541600207247.

Full text

Abstract:

碩士<br>明道大學<br>材料科學與工程學系碩士班<br>97<br>A microwave/Fe3O4 catalytic system was chosen for treatment of volatile organic compounds (VOCs). The system comprises a homemade microwave oven modified as the reactor in this study, which was fitted with a vertical, cylindrical quartz reactor comprising a catalytic packed column filled with granular Fe3O4, a microwave catalyst of iron (II, III) oxide. Experimental results showed that the destruction and removal efficiency (DRE) of isopropyl alcohol by microwave/Fe3O4 system reached to 99%, and the temperature of the catalytic packed column increased rapidl

APA, Harvard, Vancouver, ISO, and other styles

38

Sung, Ti-Wen, and 宋狄文. "Synthesis and Magnetic Property of Monodisperse Fe3O4 Nanoparticles." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/15500989874650386343.

Full text

Abstract:

碩士<br>遠東技術學院<br>機械研究所<br>93<br>This study is about the synthesis of Fe3O4 nanoparticles with precisely controlled sizes and size distributions. The precursors are oxygen-containing organic materials such as Fe(acac)3 or inorganic materials such as FeO(OH), which are decomposed in high-boiling point solvents to provide the monodispersed Fe3O4 nanoparticles. Particle diameters can be tuned from 4 to 20 nm by varying reaction conditions or by seed-mediated growth methods. Fe3O4 nanoparticles are synthesized with narrow size distributions (σ ~ 5 to 10%). The size of nanoparticles are mainly contro

APA, Harvard, Vancouver, ISO, and other styles

39

Chen, S. Y., and 陳尚煜. "Anomalous positive magnetoresistance in Fe3O4-Ag composite films." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/32506591733627718248.

Full text

Abstract:

碩士<br>國立臺灣大學<br>物理學研究所<br>89<br>Abstract The anomalous positive magnetoresistance effect of Agx-(Fe3O4)1-x composite films have been investigated. Samples were prepared by dc magnetron sputtering with composite targets and the Si(100) wafer was used as the substrate. We have studied the composition, structure, and morphology of Agx- (Fe3O4)1-x composite films by EPMA, X-ray diffraction and SEM respectively. The resistivity of Agx-(Fe3O4)1-x films were measured by four-probe method. The MR was in general obtained with a maximum applied magnetic field of 0.8 Tesla at 350K,

APA, Harvard, Vancouver, ISO, and other styles

40

Lu, Zhao-Ming. "Dielectric Properties of (CaCu3Ti4O12)1-x(Fe3O4)x." 2007. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-2607200717365000.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

Yei, Yao-Chung, and 葉耀中. "Synthesis of Carbon Materials/Fe3O4 for removal Dye." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/66537833457428501850.

Full text

Abstract:

碩士<br>元智大學<br>化學工程與材料科學學系<br>105<br>Activated carbon (AC) is a porous material which contains chemical stability and high specific surface area. AC is widely used in dyeing adsorbent. Mesoporous material is more efficient. The specific surface area and the ratio of mesoporous volume are improved by alkali activation method. KOH activated method is more efficient than others. Graphene oxide (GO) is hydrophilic and monolayer of carbon material. GO can remove the aromatic dye with graphite structure and induces the π-π interaction between dye and GO. Synthesizing the iron oxide with porous carbon

APA, Harvard, Vancouver, ISO, and other styles

42

Lu, Zhao-Ming, and 呂昭民. "Dielectric Properties of (CaCu3Ti4O12)1-x(Fe3O4)x." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/95232832706882081631.

Full text

Abstract:

碩士<br>臺灣大學<br>物理研究所<br>95<br>The dielectric properties of (CaCu3Ti4O12)1-x(Fe3O4)x (x = 0.01, 0.05, 0.1, 0.2, 0.3 and 0.4) have been studied, only 1% mixing of Fe3O4 dramatically quenches the huge of 104 down to 65 over the measured temperature range from 15 K to 300 K. At low T, CaCu3Ti4O12 (CCTO) transforms into an antiferromagnetic phase at TN = 25 K. The dielectric constant of (CaCu3Ti4O12)1-x(Fe3O4)x (x = 0.01, 0.05, 0.1, 0.2 and 0.3) shows sharp decrease below TN, providing possible coupling between the polarization and magnetization. In addition, the (CCTO)0.95(Fe3O4)0.05 and (CCTO)

APA, Harvard, Vancouver, ISO, and other styles

43

Lan, Yi-Ping, and 藍怡平. "Synthesis and Characterization of Fe3O4 Thin-Film Supercapactor." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/30189499865650797047.

Full text

Abstract:

碩士<br>國立臺灣大學<br>化學工程學研究所<br>90<br>Abstract Because of the capacitors of the supercapacitance is limited by electrode material. In this thesis is devoted to the discovery of an inexpensive and environmentally benign electrode material to commercialize. The materials are selected from Fe3O4 (magnetite). We prepared electrode material for corrosion method and electrode plating method, which insist to characterize the properties of these electrodes in different conditions.The results show that the corrosion method, which exhibits a capacitance 0.15F/cm2 with an operating voltage is l

APA, Harvard, Vancouver, ISO, and other styles

44

Wu, Yenwun, and 吳衍文. "Effect Of Fe3O4 On High Frequency Noise Suppression." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/91493420737740266794.

Full text

Abstract:

碩士<br>義守大學<br>電子工程學系<br>100<br>This study investigates the effect of Fe3O4 on high frequency noise suppression. The simulator HFSS is employed to investigate the structure and the parameter of magnetic materials and the results were compared with experimental ones. The thickness and conductivity of magnetic films are two important factors in determining the noise suppression. For FR-4 substrate coated with magnetic material Fe3O4, the noise suppression can reach 54% at 10GHz. The result shows that noise suppression can reach 95% at 10GHz for the specimens doping 50wt% conductive silver.

APA, Harvard, Vancouver, ISO, and other styles

45

Mulamba, Oliver Kasongo. "Synthesis and Characterization of Piezo-Magneto (PVDF-Fe3O4) Composites." Thesis, 2011. http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9312.

Full text

Abstract:

This research entails the synthesis and characterization of a novel class of materials which incorporate both magnetic and piezoelectric characteristics. The composite is made up of the piezoelectric polymer PVDF and magnetic nanoparticles. The testing samples are produced using a spin casting process. The characterizations of the samples were performed using X-ray diffraction, Atomic force microscopy, linear staging, Dynamic mechanical analysis, Differential scanning calorimetry, and Fourier transform Infra-Red. X-ray diffraction and Atomic force microscopy showed that the presence of the F

APA, Harvard, Vancouver, ISO, and other styles

46

Chang, Chia-Chih, and 張嘉芝. "Preparation and characterization of drug release Fe3O4/Pluronic nanocomposites." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/83pbb7.

Full text

Abstract:

碩士<br>國立中興大學<br>材料科學與工程學系所<br>99<br>This study is focused on the preparation of Fe3O4/Pluronic nanocomposites containing the properties of targeted and thermosensitive function used as drug carries. The monodispersed 6 nm and 13 nm Fe3O4 nanoparticles have been prepared through thermal decomposition process. To improve the biocompartible property of Fe3O4 nanoparticles, the fabricated nanoparticles were modified by 11-aminoundecanoic acid tetramethylammonium salt to change the hydrophobic surface of Fe3O4 to be hydrophilic characteristic. Finally, the Pluronic with different molecular weights

APA, Harvard, Vancouver, ISO, and other styles

47

Yeh, Kuan-Wen, and 葉冠妏. "Formation of SiO2-Fe3O4 mesoporous nanoparticles for drug delivery." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/87568607195703350779.

Full text

Abstract:

碩士<br>中原大學<br>奈米科技碩士學位學程<br>97<br>This study is divided into four parts. In the first part, the precursors FeCl3．6H2O and FeCl2．4H2O were dissolved in water and then alkali was added to synthesis magnetite nanoparticles by co-precipitation method and high rotation speed. The distribution of particle size, surface potential, morphology, lattice structure and magnetic properties of these particles were analyzed and compared with those of commercial magnetite. From the results, the particle size of magnetite, synthesized by using homogenizer, was about 10 nm. The magnetization is 90 emu/g, as hig

APA, Harvard, Vancouver, ISO, and other styles

48

Chean, Y. R., and 沈有仁. "Epitaxy growth and structural analysis of Fe3O4/MgO superlattices." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/85871860971766366712.

Full text

Abstract:

碩士<br>國立中正大學<br>物理學系<br>85<br>Single crystalline Fe3O4/MgO superlattices have been grown on MgO (001), using molecular beam epitaxy. Superlattices consisting of fixed thicknessof MgO layer ~ 20A and varied thickness of Fe3O4 layers of 10-80A have beensynthesized with 30-50 bilayer repeats. This system provides an opportunityto study the low dimensional effects of the structure and other physical properties of Fe3O4. Modulation coherency and sharp interface of the superlattices are charac

APA, Harvard, Vancouver, ISO, and other styles

49

Yeh, Chuan-Hsun, and 葉全勛. "Preparation and Characterization of Graphene/Fe3O4 Microwave Absorbing Composites." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/ecu389.

Full text

Abstract:

碩士<br>國立雲林科技大學<br>化學工程與材料工程系<br>102<br>With the rapid development of science, electrical appliances become more and more important in our lives. However, while enjoying the convenience, these electrical appliances bring the undesired effect of electromagnetic waves. Radar absorbing materials (RAM) or microwave absorbers are the materials which can absorb and dissipate incident electromagnetic wave by converting it into thermal energy. These materials can be used in the fields of electromagnetic interference (EMI) reduction, human-health protection, and even military stealthy technology. In thi

APA, Harvard, Vancouver, ISO, and other styles

50

Yan, Ying-Hui, and 顏英卉. "Resonant Three-wave X-ray Diffraction study on Fe3O4." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/17122683362960904199.

Full text

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!