Precipitation of carbon nanoparticles encapsulating silicon carbide from molten oxide

1998 ◽  
Vol 13 (8) ◽  
pp. 2039-2041
Author(s):  
Mamoru Mitomo ◽  
Chong-Min Wang ◽  
Hideyuki Emoto
Keyword(s):  
Carbon Nanoparticles ◽  
Preparation Method ◽  
Arc Discharge ◽  
Electric Arc ◽  
Carbon Nanoparticle ◽  
Oxide Melt ◽  
Transmission Electron ◽  
Ceramic Process ◽  
Molten Oxide ◽  
20 Nm

A kind of fullerenes, carbon nanoparticle encapsulating β–SiC grain, was precipitated during cooling Al2O3–Y2O3 –CaO oxide melt containing SiC and C from 2023 K. The SiC grains with a diameter of 5–20 nm were covered with 2–4 graphitic carbon layers with the spacing of 0.34 nm as revealed by high resolution transmission electron microscopy. The result provides a new preparation method of carbon nanoparticles through a ceramic process, which contrasts with previous physical methods applying electric arc discharge or electron irradiation in vacuum.

Graphitic Carbon Nanoparticles from Asphaltenes

2011 ◽  
Vol 1312 ◽  
Author(s):  
Christophe Danumah ◽  
Andrew J. Myles ◽  
Hicham Fenniri
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Carbon Nanoparticles ◽  
Scanning Transmission Electron Microscopy ◽  
Carbon Nanomaterials ◽  
Potential Source ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
Carbon Coated ◽  
20 Nm

ABSTRACTWe report preliminary studies on the preparation of carbon nanoparticles (CNPs) of ~ 20 nm in diameter derived from asphaltenes under mild conditions. This transformation occurred upon heating a thin film of asphaltenes cast on a carbon coated copper grid under both nitrogen and oxygen atmosphere. The resulting CNPs were characterized by thermogravimetric analysis (TGA), scanning/transmission electron microscopy (SEM/STEM), transmission electron microscopy (TEM), elemental analysis (EA) and Auger electron spectroscopy (AES). The findings point towards asphaltenes, a crude oil by-product, as a potential source for carbon nanomaterials.

Obtaining Carbon Nanoparticles with the Use of Electric-Arc Discharge between Coaxial Electrodes

2004 ◽  
Vol 77 (3) ◽  
pp. 647-650 ◽  
Author(s):  
V. V. Chuprasov ◽  
M. S. Tret'yak ◽  
V. V. Toropov ◽  
S. A. Chizhik ◽  
A. P. Solntsev
Keyword(s):  
Carbon Nanoparticles ◽  
Arc Discharge ◽  
Electric Arc ◽  
Electric Arc Discharge

Production of aluminum nanoparticles by wet mechanical milling

MRS Advances ◽  
2020 ◽  
Vol 5 (61) ◽  
pp. 3133-3140
Author(s):  
S. Mancillas-Salas ◽  
P. Hernández-Rodríguez ◽  
A.C. Reynosa-Martínez ◽  
E. López-Honorato
Keyword(s):  
Mechanical Milling ◽  
Arc Discharge ◽  
Aluminum Nanoparticles ◽  
Attrition Milling ◽  
Transmission Electron ◽  
Low Costs ◽  
Agglomeration Of Nanoparticles ◽  
High Yields ◽  
20 Nm ◽  
By Products

AbstractOne of the great challenges in the use of nanomaterials is their production at low costs and high yields. In this work aluminum nanoparticles, from aluminum powder, were produced by wet mechanical milling through a combination of different attrition milling conditions such as ball-powder ratio (BPR) and the amount of solvent used. It was observed that at 600 rpm with a BPR of 500/30 g for 12 h, it was possible to produce nanoparticles with a size close to 20 nm, while at 750 rpm with a BPR of 380/12.6 g for 12 h, nanoparticles of approximately 10 nm were obtained. Scanning and transmission electron microscopy confirmed that the milling product is an agglomeration of nanoparticles with different sizes. These results show the feasibility of obtaining aluminum nanoparticles by mechanical milling using only ethanol as solvent, avoiding hazardous by-products obtained from chemical routes, and the use of complicated methods such as laser ablation and arc discharge.

scholarly journals Synthesis and Anti-Proliferative Effect of Linalool propionate Loaded Carbon Nanoparticles

2019 ◽  
Author(s):  
Gayathri P Kothandaraman ◽  
K Sathish Kumar ◽  
Nikhishaa Sree R. ◽  
J Rithika ◽  
S Dhanasree
Keyword(s):  
Proliferative Activity ◽  
Carbon Nanoparticles ◽  
Antibacterial Property ◽  
Water Soluble ◽  
Gram Negative Bacteria ◽  
Carbon Nanoparticle ◽  
Gram Negative ◽  
Proliferative Effect ◽  
Transmission Electron ◽  
Medicinal Properties

The essential oils (EOs) extracted from plants hold many medicinal properties. But the delivery of the EOs and maintenance of its stability is a challenge. In this study, a linalool associated compound isolated from Coriander sativum was conjugated with carbon nanoparticle (CNP). The conjugate was characterized by Fourier transform Infrared spectroscopy (FTIR), transmission electron microscope (TEM), and particle size (PS) analysis. The nano-sized conjugate showed similar antioxidant and anti-proliferative activity when compared to the pure extract. In the case of antibacterial property, conjugate showed good inhibition against both gram-positive and gram-negative bacteria whereas the extract showed inhibition only against gram-negative bacteria. In short, the activity of the compound was not altered by its conjugation with CNP. This conjugated compound was completely water soluble which shall make it a likely formulation for hydrophilic based drug delivery applications.

Bulk Synthesis of Helical Coiled Carbon Nanostructures

2004 ◽  
Vol 858 ◽  
Author(s):  
Wei Wang ◽  
A. M. Rao
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanoparticles ◽  
Carbon Nanostructures ◽  
Catalyst Concentration ◽  
Ambient Pressure ◽  
Three Dimensional ◽  
Atomic Ratio ◽  
Metal Catalyst ◽  
Transmission Electron ◽  
20 Nm

ABSTRACTThree dimensional helical coiled carbon nanostructures including coiled nanowires and nanotubes were synthesized at ambient pressure using a thermal chemical vaporization deposition (CVD) process in which xylene and acetylene were used as the primary carbon source. A bi-metal catalyst formed from a mixture of ferrocene and indium isopropoxide served as the seed to initiate the growth of these helical coiled nanostructures. The as-synthesized coiled nanowires and nanotubes are pure without the presence of amorphous carbon nanoparticles. By precisely controlling the atomic ratio of In / (Fe+In), coiled nanowires or nanotubes can be synthesized exclusively. The diameters of the as-grown coiled nanowires vary from several tens to several hundreds nanometers, whereas the diameters of the coiled nanotubes are around 20 nm. The structure of coiled nanowires and nanotubes were determined using scanning electron microscopy and transmission electron microscopy. The key novel aspects of this research are: (i) to synthesize helical coiled nanotubes or nanowires exclusively by controlling the bi-catalyst concentration of Fe and In, and (ii) no preformed substrates are required which implies that our process is amenable for scaled-up synthesis of these nanostructures.

Direct Observation of Heat Exchanger Deposits by Cross Sectioning

1967 ◽  
Vol 25 ◽  
pp. 364-365
Author(s):  
R. W. Anderson ◽  
D. L. Senecal
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Heat Exchanger ◽  
Direct Observation ◽  
Cross Sections ◽  
Preparation Method ◽  
Specimen Preparation ◽  
Flowing Water ◽  
Transmission Electron ◽  
Deposit Layer

A problem was presented to observe the packing densities of deposits of sub-micron corrosion product particles. The deposits were 5-100 mils thick and had formed on the inside surfaces of 3/8 inch diameter Zircaloy-2 heat exchanger tubes. The particles were iron oxides deposited from flowing water and consequently were only weakly bonded. Particular care was required during handling to preserve the original formations of the deposits. The specimen preparation method described below allowed direct observation of cross sections of the deposit layers by transmission electron microscopy.The specimens were short sections of the tubes (about 3 inches long) that were carefully cut from the systems. The insides of the tube sections were first coated with a thin layer of a fluid epoxy resin by dipping. This coating served to impregnate the deposit layer as well as to protect the layer if subsequent handling were required.

Low Energy Ar Ion Milling of FIB TEM Specimens from 14 nm and Future FinFET Technologies

2018 ◽  
Author(s):  
C.S. Bonifacio ◽  
P. Nowakowski ◽  
M.J. Campin ◽  
M.L. Ray ◽  
P.E. Fischione
Keyword(s):  
Field Effect Transistor ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Specimen Preparation ◽  
Ion Milling ◽  
Transmission Electron ◽  
High Resolution Tem ◽  
Effect Transistor ◽  
20 Nm ◽  
Argon Ion

Abstract Transmission electron microscopy (TEM) specimens are typically prepared using the focused ion beam (FIB) due to its site specificity, and fast and accurate thinning capabilities. However, TEM and high-resolution TEM (HRTEM) analysis may be limited due to the resulting FIB-induced artifacts. This work identifies FIB artifacts and presents the use of argon ion milling for the removal of FIB-induced damage for reproducible TEM specimen preparation of current and future fin field effect transistor (FinFET) technologies. Subsequently, high-quality and electron-transparent TEM specimens of less than 20 nm are obtained.

To Eliminate Curtain Effect of FIB TEM Samples by a Combination of Sample Dicing and Backside Milling

2014 ◽  
Author(s):  
Jian-Shing Luo ◽  
Hsiu Ting Lee
Keyword(s):  
Sample Preparation ◽  
Focused Ion Beam ◽  
Preparation Method ◽  
Low Cost ◽  
Ion Beam ◽  
Sample Preparation Method ◽  
Site Specific ◽  
Dual Beam ◽  
Transmission Electron

Abstract Several methods are used to invert samples 180 deg in a dual beam focused ion beam (FIB) system for backside milling by a specific in-situ lift out system or stages. However, most of those methods occupied too much time on FIB systems or requires a specific in-situ lift out system. This paper provides a novel transmission electron microscopy (TEM) sample preparation method to eliminate the curtain effect completely by a combination of backside milling and sample dicing with low cost and less FIB time. The procedures of the TEM pre-thinned sample preparation method using a combination of sample dicing and backside milling are described step by step. From the analysis results, the method has applied successfully to eliminate the curtain effect of dual beam FIB TEM samples for both random and site specific addresses.

Utilizing Nanoprobing and Circuit Diagnostics to Identify Key Failure Mechanism of Otherwise Nonvisible Defects in 20 nm Logic Devices

2014 ◽  
Author(s):  
M.K. Dawood ◽  
C. Chen ◽  
P.K. Tan ◽  
S. James ◽  
P.S. Limin ◽  
...  
Keyword(s):  
Failure Analysis ◽  
Contact Layer ◽  
Fault Isolation ◽  
Tem Analysis ◽  
Logic Devices ◽  
Technology Advancement ◽  
Transmission Electron ◽  
Voltage Contrast ◽  
Almost All ◽  
20 Nm

Abstract In this work, we present two case studies on the utilization of advanced nanoprobing on 20nm logic devices at contact layer to identify the root cause of scan logic failures. In both cases, conventional failure analysis followed by inspection of passive voltage contrast (PVC) failed to identify any abnormality in the devices. Technology advancement makes identifying failure mechanisms increasingly more challenging using conventional methods of physical failure analysis (PFA). Almost all PFA cases for 20nm technology node devices and beyond require Transmission Electron Microscopy (TEM) analysis. Before TEM analysis can be performed, fault isolation is required to correctly determine the precise failing location. Isolated transistor probing was performed on the suspected logic NMOS and PMOS transistors to identify the failing transistors for TEM analysis. In this paper, nanoprobing was used to isolate the failing transistor of a logic cell. Nanoprobing revealed anomalies between the drain and bulk junction which was found to be due to contact gouging of different severities.

scholarly journals Environmentally Friendly Route for Fabricating Conductive Agent for Lithium-Ion Batteries: Carbon Nanoparticles Derived from Polyethylene

Catalysts ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 424
Author(s):  
Jihye Mok ◽  
Dalsu Choi ◽  
Suk Ho Bhang
Keyword(s):  
Lithium Ion Batteries ◽  
Carbon Nanoparticles ◽  
Nanoparticle Synthesis ◽  
Lithium Ion ◽  
Environmentally Friendly ◽  
Carbon Nanoparticle ◽  
P Utilization ◽  
Stable Performance ◽  
Conductive Agent ◽  
Economical Advantage

Here, we introduce an environmentally friendly way of fabricating carbon nanoparticles which can be utilized as conductive agent for lithium-ion batteries (LIBs). Polyethylene (PE), which comprises the largest portion of plastic waste, was used as a source for carbon nanoparticle synthesis. Sulfonation allowed chemical structural transformation of innately non-carbonizable PE into a carbonizable conformation, and carbon nanoparticles could be successfully derived from sulfonated PE. Then, PE-derived carbon nanoparticles were used as conductive agents for LIBs, and assembled cells exhibited stable performance. Even though the performance is not as good as Super-P, utilization of PE as a source of conductive agent for LIBs might provide an economical advantage to upcycle PE.

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