Controlled Synthesis of Manganese Oxohydroxide (MnOOH) and Mn3O4 Nanorods Using Novel Reverse Micelles

2006 ◽  
Vol 6 (3) ◽  
pp. 818-822 ◽  
Author(s):  
Xiyan Dong ◽  
Xingtang Zhang ◽  
Bing Liu ◽  
Hongze Wang ◽  
Yuncai Li ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Mild Solution ◽  
Reverse Micelles ◽  
Controlled Synthesis ◽  
Ctab Concentration ◽  
Transmission Electron ◽  
Key Factor ◽  
Manganese Oxyhydroxide

Novel reverse micelles of high CTAB concentration were successfully developed to synthesize MnOOH (manganese oxyhydroxide) nanorods with uniform diameters of about 10 nm and up to 200 nm in length under mild solution conditions and Mn3O4 nanorods with the same morphology could be obtained by calcining the precursors at 450 °C. The morphology and microstructure of the nanorods were investigated by transmission electron microscopy (TEM and HRTEM), XRD and TGA. The results showed that the concentration of CTAB was a key factor for the formation of MnOOH nanorods and only above 0.2 M the nanorods could be obtained. Moreover, the length of nanorods increased with the increase of CTAB concentration, while the diameter of nanorods retained steadily. In this way, the length of nanorods could be easily controlled from tens nanometers to hundreds nanometers by increasing the CTAB concentration from 0.35 M to 1.25 M. In addition, in our experiment the products were almost entirely rod-like shape, which indicated this method should be suitable for mass-producing.

Controlled Synthesis of Homogeneous Carbon Nano-Capsules Based on Biomaterials

2008 ◽  
Vol 58 ◽  
pp. 27-31 ◽  
Author(s):  
Yu Liang An ◽  
Yan Qiu Liu ◽  
Xia Yuan
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Carbon Nanomaterials ◽  
Controlled Synthesis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Hydrogen Flow ◽  
Fe Catalyst ◽  
Transmission Electron ◽  
Carbon Nanocapsules

A novel and practical route for preparing carbon nanocapsules using biomass – starch as the starting materials was presented. Carbon nanocapsules can be effectively synthesized by catalytic carbonizing starch in hydrogen flow. The carbohydrate was carbonized in a controllable way that leads to a large amount of carbon cages nanoparticles under Fe catalyst. Transmission electron microscopy (TEM), energy dispersive X-ray (EDX) and X-ray diffraction (XRD) were employed to characterizing carbon nanomaterials. The growth mechanism of carbon nanocapsules is briefly discussed in term of composition of precursor.

scholarly journals Size Controlled Synthesis of FeCo Alloy Nanoparticles and Study of the Particle Size and Distribution Effects on Magnetic Properties

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
A. Shokuhfar ◽  
S. S. S. Afghahi
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Magnetic Properties ◽  
Molar Ratio ◽  
Microemulsion System ◽  
Controlled Synthesis ◽  
Alloy Nanoparticles ◽  
Feco Alloy ◽  
Transmission Electron ◽  
Size Controlled

In this research the size controlled synthesis of FeCo nanoparticles was done using a quaternary microemulsion system. X-ray diffraction and high resolution transmission electron microscopy of as-synthesized nanoparticles confirm the formation of FeCo alloy nanoparticles. The effects of two process parameters, namely, water to surfactant molar ratio and molar concentration of metal salts, on the size and size distribution of nanoparticles were discussed by the aid of transmission electron microscopy. The size dependency of magnetic properties was also investigated using a room temperature vibrating sample magnetometer. The superparamagnetic-ferromagnetic and single domain-multidomain transition sizes were determined. Then the specific absorption rates at transition sizes were calculated and the best sample for magnetic hyperthermia treatment was introduced.

Tyrosine Derivative of Aminoacid Produced Bio Inspired Nanotubes and NanovesiclesSynthesis and Characterization

2020 ◽  
Vol 12 (6) ◽  
pp. 853-857
Author(s):  
Raman Govindhan ◽  
Balakrishnan Karthikeyan ◽  
Aswini Kumar Giri ◽  
Victor J. Hruby
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
High Resolution ◽  
Theoretical Calculations ◽  
Microscopic Analysis ◽  
Peptide Nanotubes ◽  
Transmission Electron ◽  
Key Factor ◽  
Dft Simulations ◽  
Self Assembled

3,5-bis(trifluoromethyl)benzylamine derivative of tyrosine single aminoacids have produced self-assembled peptide nanotubes and nanovesicles (BTTPNTs) depending on the concentration of the monomer study through optical and microscopic analysis. DFT simulations were carried out for a system of BTTPNTs and nanovesicles which also experimentally characterized by high resolution transmission electron microscopy (HR-TEM) and ultraviolet-visible (UV-Vis) absorbance. These results are used to examine the morphologies, size of the nanostructure and study its recognition of aminoacid motif is discussed. However, the length of the nanotubes gets larger with the increases of concentration. UV-Vis spectra clearly showed slight decrease in the intensity in absorption after the formation of nanotubes and nanovesicles. Theoretical calculations indicate that H-bonding is the key factor in making ring while other interactions including Van der Walls force, π–π stacking plays role to making self-assembled nanotubes and vesicles.

scholarly journals Shape-controlled synthesis and in situ characterisation of anisotropic Au nanomaterials using liquid cell transmission electron microscopy

Nanoscale ◽  
2019 ◽  
Vol 11 (36) ◽  
pp. 16801-16809 ◽  
Author(s):  
Shih-Ting Wang ◽  
Yiyang Lin ◽  
Michael H. Nielsen ◽  
Cheng Yu Song ◽  
Michael R. Thomas ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Nucleation And Growth ◽  
Crystal Nucleation ◽  
Controlled Synthesis ◽  
Transmission Electron ◽  
Liquid Cell ◽  
Shape Controlled ◽  
Fundamental Requirement

Understanding the mechanisms behind crystal nucleation and growth is a fundamental requirement for the design and production of bespoke nanomaterials with controlled sizes and morphologies.

SYNTHESIZED “IN SITU” IN REVERSE MICELLES OF SILVER-SULFIDE SEMICONDUCTORS

1996 ◽  
Vol 03 (01) ◽  
pp. 1215-1218 ◽  
Author(s):  
M.P. PILENI ◽  
L. MOTTE ◽  
F. BILLOUDET ◽  
C. PETIT
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Reverse Micelles ◽  
Silver Sulfide ◽  
X Ray ◽  
X Ray Scattering ◽  
Transmission Electron ◽  
Nanosize Particles ◽  
Good Agreement

Functionalized reverse micelles are used to control the size of silver sulfide, Ag 2 S , nanosize particles. The size of the crystallites varies linearly with the water content from 2 to 10 nm. The particles have been coated with dodecanethiol and extracted from micelles. The size of the particles dispersed in heptane has been determined by small-angles x-ray scattering (SAXS) experiments and compared to those obtained by transmission electron microscopy (TEM). A good agreement between results is obtained by these two techniques. A drop of particles previously dispersed in heptane is dried on a carbon grill. A network of the particles forming monolayers of crystallites in a hexagonal distribution appears.

Transmission Electron Microscopy Study of Gold-Coated Iron Core-Shell and Au/Fe/Au Onion-Like Nanoparticles Synthesized using Reverse Micelles

1999 ◽  
Vol 581 ◽  
Author(s):  
W.L. Zhou ◽  
E.E. Carpenter ◽  
J. Sims ◽  
A. Kumbhar ◽  
C.J. O'Connor
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Shell Structure ◽  
Reverse Micelles ◽  
Iron Core ◽  
Core Shell ◽  
Gold Shell ◽  
The Core ◽  
Transmission Electron ◽  
Core Shell Structure

ABSTRACTGold-coated iron core-shell structure and Au/Fe/Au onion-like nanoparticles synthesized using reverse micelles were characterized by transmission electron microscopy (TEM). The average nanoparticle size of the core-shell structure is about 8 nm, with about 6 nm diameter core and 2 nm shell. The gold shell structure can be resolved from both high resolution electron microscopy (HREM) image and energy dispersive X-ray spectrum (EDS). Even though the gold and iron electron diffraction rings overlap a little bit, they can still be identified due to the slight mismatch of the diffraction rings. The Au/Fe/Au onion-like nanoparticles were also observed. The nanoparticles were formed with about 6 nm diameter gold core, 1 nm iron interlayer and 2 nm gold shell. The shell structure coated on the core appeared unhomogeneous, however, in both cases the iron core and interlayer iron shell stay air-stable.

scholarly journals Controlled Synthesis of ZnO Nanostructures by Electrodeposition Method

2010 ◽  
Vol 2010 ◽  
pp. 1-6 ◽  
Author(s):  
Gong Jiangfeng ◽  
Dou Zhaoming ◽  
Ding Qingping ◽  
Xu Yuan ◽  
Zhu Weihua
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Electron Diffraction ◽  
Controlled Synthesis ◽  
Zno Nanostructures ◽  
Nanorod Arrays ◽  
Reaction Parameters ◽  
Electrodeposition Method ◽  
Transmission Electron ◽  
Good Crystallinity

We present here a systematic study on the synthesis of various ZnO nanostructures by electrodeposition method withZnCl2solution as starting reactant. Several reaction parameters were examined to develop an optimal procedure for controlling the size, shape, and surface morphology of the nanostructure. The results showed that the morphology of the products can be carefully controlled through adjusting the concentration of the electrolyte. The products present well-aligned nanorod arrays when the concentration is low. However, they act as anomalous hexangular nanoplates when the concentration ofZnCl2is higher than 5 mM. Transmission electron microscopy and select area electron diffraction results show that the product presents good crystallinity. A possible formation process has been proposed.

Facile Controlled Synthesis of Mg(OH)2 Nanoparticles with Novel Shapes

2008 ◽  
Vol 58 ◽  
pp. 55-58
Author(s):  
Jing Hui Wang ◽  
Xin Li ◽  
Jun Wei Ye ◽  
Yuan Lin ◽  
Gui Ling Ning
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Powder Diffraction ◽  
Magnesium Hydroxide ◽  
Industrial Production ◽  
Controlled Synthesis ◽  
X Ray ◽  
Transmission Electron ◽  
Template Free ◽  
Magnesium Hydroxide Nanoparticles

In this paper, magnesium hydroxide (Mg(OH)2) nanoparticles with tunable morphologies have been selectively synthesized via a facile template-free solvothermal route. The as-synthesized samples were characterized by instrumental analyses such as transmission electron microscopy (TEM) and X-ray powder diffraction (XRD). It was found that the morphology and size of the final products strongly depended on the reaction temperature and duration time. By manipulating the temperature and time in the solvothermal treatment, fiber-like, sphere-like and garland-like magnesium hydroxide nanoparticles were obtained. The described method without any catalysts or templates for preparing magnesium hydroxide nanoparticles is promising for industrial production in competition with other approaches.

Techniques for Transmission Electron Microscopy of Fiber-Matrix Interfaces in Aluminum Alloy-Boron Composites by Ion Erosio

1971 ◽  
Vol 29 ◽  
pp. 204-205
Author(s):  
G. G. Shaw
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Aluminum Alloy ◽  
Electron Beam ◽  
Pure Aluminum ◽  
Ion Milling ◽  
Transmission Electron ◽  
Fiber Matrix ◽  
Ion Erosion ◽  
Row Of Fibers

The morphology and composition of the fiber-matrix interface can best be studied by transmission electron microscopy and electron diffraction. For some composites satisfactory samples can be prepared by electropolishing. For others such as aluminum alloy-boron composites ion erosion is necessary.When one wishes to examine a specimen with the electron beam perpendicular to the fiber, preparation is as follows: A 1/8 in. disk is cut from the sample with a cylindrical tool by spark machining. Thin slices, 5 mils thick, containing one row of fibers, are then, spark-machined from the disk. After spark machining, the slice is carefully polished with diamond paste until the row of fibers is exposed on each side, as shown in Figure 1.In the case where examination is desired with the electron beam parallel to the fiber, preparation is as follows: Experimental composites are usually 50 mils or less in thickness so an auxiliary holder is necessary during ion milling and for easy transfer to the electron microscope. This holder is pure aluminum sheet, 3 mils thick.

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