A Novel Fabrication of Spherical Fe50ni50 Alloy Powders via in-Situ De-Wetting of Liquid Solid Interface

: Spherical Fe50Ni50 alloy powders were fabricated via a novel route based on in-situ interface de-wetting between liquid Fe-Ni alloy and alumina. The obtained Fe50Ni50 alloy particles exhibit very good spherical shape according to SEM images. Furthermore, the cross-sectional SEM images show that there are no pores and bulk inclusions in the internal region of the spherical particles. The XRD results show a trace amount of the impurity alumina phase appearing in taenite phase. The size distribution agreed well with the SEM observation confirms that the alumina powders successfully segregated pre-alloy powders. As an incidental benefit, the surface alumina particles were treated as the electrical insulation coatings. The magnetic character shows that spherical Fe50Ni50 powders exhibit a good soft magnetic property even though with a slightly decreasing of saturation magnetization due to non-magnetic coatings. Our strategies provide a method to in-situ fabricate insulation coated Fe-Ni spherical alloy powders as magnetic powder core.

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SiO2-Coated Fe-Ni Alloy Core–Shell Structures Synthesized by a Facile Chemical Method

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.697.303 ◽

2016 ◽

Vol 697 ◽

pp. 303-306

Author(s):

Guo Jun Li ◽

Yun Hui Mei ◽

Feng Hou

Keyword(s):

Magnetic Properties ◽

Spherical Particles ◽

Core Shell ◽

X Ray Diffraction ◽

Soft Magnetic ◽

Alloy Particles ◽

Transmission Electron ◽

Ni Alloy ◽

Wet Chemical ◽

Silica Layers

Fe-Ni@ SiO2core–shell structured micrometer spherical particles with nanometer thick SiO2 shell were fabricated by a facile wet chemical process, their compositions and mechanisms were investigated using x-ray diffraction and Fourier transform of infra-red spectra, and their microstructures and magnetic properties were analyzed by high-resolution transmission electron microscopy and vibrating sample magnetometer. The structure of the synthesized SiO2-coated Fe-Ni alloy particles varied with adding TEOS contents. As-prepared Fe-Ni@SiO2 composites exhibit typical soft magnetic properties. Their highest saturation magnetization approximately linear decreases from 176 emu g−1for pure Fe-Ni alloy powders to 121 emu g−1for the coated powders with 20nm amorphous silica layers, but the coercivity of all different thickness SiO2-coated Fe-Ni alloy powders maintains in the range of about 25 Oe.

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In situ visualization of bronchial submucosal glands and their secretory response to acetylcholine

AJP Lung Cellular and Molecular Physiology ◽

10.1152/ajplung.1997.272.2.l203 ◽

1997 ◽

Vol 272 (2) ◽

pp. L203-L210 ◽

Cited By ~ 15

Author(s):

S. K. Inglis ◽

M. R. Corboz ◽

A. E. Taylor ◽

S. T. Ballard

Keyword(s):

Spherical Shape ◽

Spherical Particles ◽

Cross Sectional ◽

Video Microscope ◽

Submucosal Glands ◽

Membrane Bound ◽

Gland Duct ◽

Secretory Products ◽

Secretion Product

Airway submucosal glands secrete both macromolecules and liquid, yet the mechanisms by which these substances are secreted are not well understood. In this study, a video microscope was used to directly visualize the submucosal glands in isolated porcine distal bronchi and to observe their responses to acetylcholine (ACh), a glandular secretagogue. Submucosal glands were classified as either "antral," "linear," or "convoluted" glands based on the morphology of their terminal collecting ducts. Because antral duct glands were most easily visualized, the response to ACh was studied in detail in this gland type. Within 5-10 s after addition of 10 microM ACh, the cross-sectional area of the gland duct openings to the airway surface increased severalfold but returned to pre-ACh dimensions within 1 min. Between 30 s and 10 min after ACh addition, spherical particles (1-10 microm) entered the antral ducts from distal acini and exited through the duct openings to the airway surface. Some of the particles were retained within the antral duct where they were kept in constant motion by the action of cilia present within the antral duct. The particles, which are likely to contain the macromolecular secretory products of mucous and/or serous cells, maintained their spherical shape within the gland duct, suggesting that the secretion product was membrane bound. To our knowledge, these studies provide the first description of airway submucosal gland secretion as viewed in situ.

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Oxidation Kinetics of Cu-Ni Alloy Observed by in situ UHV-TEM

MRS Proceedings ◽

10.1557/proc-1026-c05-03 ◽

2007 ◽

Vol 1026 ◽

Author(s):

Li Sun ◽

John E. Pearson ◽

Judith C. Yang

Keyword(s):

High Vacuum ◽

Alloy Film ◽

Ultra High Vacuum ◽

Cross Sectional ◽

Primary Mechanism ◽

Transmission Electron ◽

Ni Alloy ◽

Cu Oxidation ◽

Kinetics Of

AbstractThe nucleation and growth of Cu2O and NiO islands due to oxidation of Cu-24%Ni(001) films were monitored at various temperatures by in situ ultra-high vacuum (UHV) transmission electron microscopy (TEM). In remarkable contrast to our previous observations of Cu and Cu-Au oxidation, irregular-shaped polycrystalline oxide islands were observed to form with respect to the Cu-Ni alloy film, and an unusual second oxide nucleation stage was noted. Similar to Cu oxidation, the cross-sectional area growth rate of the oxide island is linear indicating oxygen surface diffusion is the primary mechanism of oxide growth.

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In situ TEM investigations of reactions of Ni, Fe and Fe–Ni alloy particles and their oxides with amorphous carbon

Carbon ◽

10.1016/j.carbon.2008.11.038 ◽

2009 ◽

Vol 47 (3) ◽

pp. 856-865 ◽

Cited By ~ 35

Author(s):

R. Anton

Keyword(s):

Amorphous Carbon ◽

In Situ Tem ◽

Alloy Particles ◽

Ni Alloy

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Study on the Fabrication of Superhydrophobic Microporous Polypropylene Flat Membrane Using In Situ Synthesis of Modified Fluorinated Silica Nano Particles

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.829.371 ◽

2013 ◽

Vol 829 ◽

pp. 371-375 ◽

Cited By ~ 1

Author(s):

Saba Raveshiyan ◽

Reza Yegani ◽

Behzad Pourabbas ◽

Akram Tavakkoli

Keyword(s):

Pure Water ◽

Sol Gel ◽

Nano Particles ◽

Sem Images ◽

Cross Sectional ◽

Transfer Resistance ◽

Thermally Induced ◽

Coated Membranes ◽

Membrane Contactors

The wettability is the most important features of membrane, when it works as contactors. Although the membrane contactors offer many advantages over conventional contacting equipments, additional mass transfer resistance is introduced when micropores are filled with aqueous absorbents. Therefore, fabrication of superhydrophobic membrane which prevents diffusion of aqueous absorbent into membrane pores is a highly challenging task. In this work, superhydrophobic polypropylene (PP) membrane was fabricated using in situ synthesis of silica nano particles via thermally induced phase separation (TIPS) method. Flat sheet fabricated PP membranes were casted with methanolic solution containing various ratios of perfluorooctyltriethoxysilane (PFOTES)/ tetraethylortosilicate (TEOS) and then sol-gel reaction between the mixed silances was completed. The contact angle of coated membrane was reached to 168 degree, when the percentage of PFOTES/TEOS was fixed at 50% (mol/mol). Interestingly, due to the microporous structure of PP membrane, the synthesized fluorinated silica nanoparticles were observed on the surface as well as in the cross-sectional area of the membrane. Field emission scanning electron microscopy (FE-SEM) images were confirmed this point. Chemical structure of the coated membranes with 50% PFOTES was compared with pure PP membrane using ATR-IR. In order to evaluate the operational performance, coated membranes were immersed in aqueous solutions of mono ethanol amine (MEA), di ethanol amine (DEA) and pure water. In comparison with pure PP membrane, obtained results showed that the wettability of coated membranes was considerably decreased.

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In Situ TEM Investigation of Processes Catalyzed by Pd-Ni Alloy Particles on Carbon Substrates in the Presence and Absence of Oxygen

Journal of Catalysis ◽

10.1006/jcat.1994.1314 ◽

1994 ◽

Vol 149 (2) ◽

pp. 474-485 ◽

Cited By ~ 8

Author(s):

R. Anton ◽

O. Reetz ◽

A.A. Schmidt

Keyword(s):

In Situ Tem ◽

Alloy Particles ◽

Ni Alloy ◽

Carbon Substrates ◽

Presence And Absence

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The reaction of amorphous Ni-Nb films with Si in the presence of a native SiO2 layer

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100176459 ◽

1990 ◽

Vol 48 (4) ◽

pp. 664-665

Author(s):

N. Rozhanski ◽

A. Barg

Keyword(s):

High Temperature ◽

Crystallization Temperature ◽

Diffusion Barriers ◽

Sio2 Layer ◽

Si Substrate ◽

Cross Sectional ◽

Plan View ◽

Temperature Range ◽

Sputter Deposited

Amorphous Ni-Nb alloys are of potential interest as diffusion barriers for high temperature metallization for VLSI. In the present work amorphous Ni-Nb films were sputter deposited on Si(100) and their interaction with a substrate was studied in the temperature range (200-700)°C. The crystallization of films was observed on the plan-view specimens heated in-situ in Philips-400ST microscope. Cross-sectional objects were prepared to study the structure of interfaces.The crystallization temperature of Ni5 0 Ni5 0 and Ni8 0 Nb2 0 films was found to be equal to 675°C and 525°C correspondingly. The crystallization of Ni5 0 Ni5 0 films is followed by the formation of Ni6Nb7 and Ni3Nb nucleus. Ni8 0Nb2 0 films crystallise with the formation of Ni and Ni3Nb crystals. No interaction of both films with Si substrate was observed on plan-view specimens up to 700°C, that is due to the barrier action of the native SiO2 layer.

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A New Method of Wafer Level Plan View TEM Sample Preparation by DualBeam

ISTFA 2008: Conference Proceedings from the 34th International Symposium for Testing and Failure Analysis ◽

10.31399/asm.cp.istfa2008p0168 ◽

2008 ◽

Author(s):

Hyoung H. Kang ◽

Michael A. Gribelyuk ◽

Oliver D. Patterson ◽

Steven B. Herschbein ◽

Corey Senowitz

Keyword(s):

Sample Preparation ◽

Ex Situ ◽

Wafer Level ◽

Cross Sectional ◽

Plan View ◽

Manufacturing Line ◽

Transmission Electron ◽

Thin Lamella ◽

Preparation Techniques

Abstract Cross-sectional style transmission electron microscopy (TEM) sample preparation techniques by DualBeam (SEM/FIB) systems are widely used in both laboratory and manufacturing lines with either in-situ or ex-situ lift out methods. By contrast, however, the plan view TEM sample has only been prepared in the laboratory environment, and only after breaking the wafer. This paper introduces a novel methodology for in-line, plan view TEM sample preparation at the 300mm wafer level that does not require breaking the wafer. It also presents the benefit of the technique on electrically short defects. The methodology of thin lamella TEM sample preparation for plan view work in two different tool configurations is also presented. The detailed procedure of thin lamella sample preparation is also described. In-line, full wafer plan view (S)TEM provides a quick turn around solution for defect analysis in the manufacturing line.

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A novel and facile route to in-situ formation of composites with dual coupling interactions for considerable millimeter-wave absorption performance

Journal of Materials Chemistry C ◽

10.1039/d1tc03398k ◽

2021 ◽

Author(s):

Chuyang Liu ◽

Tao Jiang ◽

Tian Gao ◽

Guangxian Xia ◽

Yufan Cao ◽

...

Keyword(s):

Millimeter Wave ◽

Exchange Coupling ◽

Ferromagnetic Coupling ◽

Soft Magnetic ◽

Magnetic Exchange ◽

Magnetic Exchange Coupling ◽

Absorption Performance ◽

In Situ Formation ◽

Facile Route

It is well known that both hard/soft magnetic exchange-coupling and ferroelectric-ferromagnetic coupling could facilitate the microwave absorption behavior. Herein, we propose the BaZrxFe12-xO19/Fe3O4/BaZrO3 composites to integrate the advantages of the...

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