Preparation of CMC-Stabilized FeS Nanoparticles and their Enhanced Performance for Cr(VI) Removal

2011 ◽  
Vol 287-290 ◽  
pp. 96-99 ◽  
Author(s):  
Xian Biao Wang ◽  
Jin Liu ◽  
Dong Lin Zhao ◽  
Xiao Jie Song
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Carboxymethyl Cellulose ◽  
Sodium Carboxymethyl Cellulose ◽  
Soft Template ◽  
Sulfur Source ◽  
Uniform Size ◽  
Synthetic Process ◽  
Transmission Electron ◽  
Facile Route

FeS nanoparticles with uniform size have been prepared through a facile route using (sodium carboxymethyl cellulose) CMC as soft template. The nanoparticles are about 4-6 nm by observation of transmission electron microscopy (TEM). The CMC template could also stabilize the FeS nanoparticles and resist aggregation. It is important to note that the size of nanoparticles can be easily controlled by the concentration of iron and sulfur source during the synthetic process. Interestingly, the FeS nanoparticles could assemble into rod-like morphology at higher concentration. More importantly, the CMC-stabilized FeS nanoparticles exibit enhanced performance for Cr(Ⅵ) removal as compared with FeS synthesized without CMC stabilizer.

Preparation of Straight and Orderly Polypyrrole Microrods through Soft Template Methods

2011 ◽  
Vol 306-307 ◽  
pp. 679-683
Author(s):  
Li Bo Sun ◽  
Yuan Chang Shi ◽  
Lin Ya Chu ◽  
Bing Chang Zhang ◽  
Jiu Rong Liu
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Cetyltrimethylammonium Bromide ◽  
Growth Process ◽  
Room Temperature ◽  
Oxidative Polymerization ◽  
Soft Template ◽  
Microemulsion System ◽  
Transmission Electron ◽  
The Impact

The straight and orderly microrods of polypyrrole(PPy) was synthesized in a microemulsion system consisted of cetyltrimethylammonium bromide(CTAB), n-pentanol, water and pyrrole by chemical oxidative polymerization, in which CTAB was used as soft templates and APS was used as the oxidant. Fourier-transform infrared spectroscopy (FTIR) was used to characterize the structure of the PPy microrods. Transmission electron microscopy (TEM) and high resolution transmission electron microscopy (HRTEM) was used to characterize the morphology of the samples. We discussed the impact of temperature, the adding way of the oxidant, the amount of cosurfactant n-pentanol to the morphology of PPy microrods. The results showed that straight and orderly PPy microrods with a diameter about 300nm and a length up to 20μm were synthesized when the temperature was kept at room temperature (25°C), the dropping time of APS was more than 1.5h, the ratio of CTAB to n-pentanol was 0.6:1, and the polymerization time was about 24h. We studied the growth process of PPy microrods by HTEM analysis. HTEM images revealed that the growth process of PPy changed from hollow microrods, semi-hollow microrods, and finally solid microrods.

SELF-ORGANIZED DISTRIBUTION OF EXTREMELY SMALL Ti QUANTUM DOTS IN SiO2

NANO ◽  
2007 ◽  
Vol 02 (03) ◽  
pp. 189-193 ◽  
Author(s):  
J. W. RABALAIS ◽  
J. P. ZHAO ◽  
D. X. HUANG ◽  
W. K. CHU
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Vacuum Annealing ◽  
Annealing Process ◽  
Two Dimensional ◽  
Uniform Size ◽  
Particle Spacing ◽  
Self Organized ◽  
Transmission Electron ◽  
Dimensional Distribution

Self-organized extremely small Ti nanodots have been formed in the subsurface of SiO 2 by implantation of isotopic 48 Ti + at a kinetic energy of 9 keV into (0001) Z-cut quartz, followed by a vacuum annealing process. Transmission electron microscopy (TEM) images show that the Ti nanodots have a two-dimensional distribution, i.e., a uniform size as small as 3.8 nm and relatively uniform positions with nearly constant inter-particle spacing of ~ 1.5 nm. A mechanism for the two-dimensional spatial distribution and the inhibition of chemical reactions between Ti and SiO 2 is discussed.

A Facile Route to Nano-Sized Nickel Sulfide via Thermolysis of Nickel Alkanethiolate

2008 ◽  
Vol 8 (9) ◽  
pp. 4873-4876 ◽  
Author(s):  
Kiwhan Sung ◽  
Sang Hyun Lee ◽  
Taek-Mo Chung ◽  
Chang Gyoun Kim
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Nickel Sulfide ◽  
Reaction System ◽  
X Ray Diffraction ◽  
X Ray ◽  
Size And Shape ◽  
Transmission Electron ◽  
Square Planar ◽  
Facile Route

Nano-sized nickel sulfides were synthesized by the thermolysis of nickel alkanethiolates in the presence of coordinating ligands. Nickel alkanethiolates were synthesized by the reaction of the square planar nickel 1-dimethylamino-2-methyl-2-propanolate [Ni(dmamp)2] with various n-alkanethiols. The effect of ligands in the reaction system has been investigated to control the size and shape of nano-sized nickel sulfides. TEM images show that the products are nano-sized nickel sulfides in rod and plate shapes. Nickel alkanethiolates and nano-sized nickel sulfides have been characterized by means of X-ray diffraction and transmission electron microscopy.

Soft-Template Synthesis of Single-Crystalline CdS Dendrites

2006 ◽  
Vol 6 (1) ◽  
pp. 162-167 ◽  
Author(s):  
Haixia Niu ◽  
Qing Yang ◽  
Kaibin Tang ◽  
Yi Xie ◽  
Yongchun Zhu
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Optical Properties ◽  
Soft Template ◽  
X Ray Diffraction ◽  
Single Crystalline ◽  
X Ray ◽  
Transmission Electron ◽  
Scanning Electron

The single-crystalline CdS dendrites have been fabricated from the reaction of CdCl2 and thiourea at 180 °C, in which glycine was employed as a soft template. The obtained products were explored by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and selected area electronic diffraction. The optical properties of CdS dendrites have been investigated by ultraviolet and visible light (UV-vis) and photoluminescence techniques. The investigations indicated that the dendrites were grown due to the anisotropic properties enhanced by the use of Glycine in the route.

Size-Controlled Synthesis of Cds Nanocrystals in Vesicles Confirmed in Situby Cryo-Transmission Electron Microscopy

1997 ◽  
Vol 3 (S2) ◽  
pp. 435-436
Author(s):  
M. T. Kennedy ◽  
B. A. Korgel ◽  
J. A. Zasadzinski ◽  
H. G. Monbouquette
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Positional Information ◽  
Vesicle Membrane ◽  
Uniform Size ◽  
Cds Nanocrystals ◽  
Ammonium Sulfide ◽  
Transmission Electron ◽  
Size Controlled

Size-quantized CdS nanocrystals, synthesized within phosphatidylcholine (PC) vesicles by reaction compartmentalization, were observed in situ to confirm the proposed method of formation and to investigate the concept of membrane-mediated crystal growth. Vesicle solutions representing three different CdS nanocrystal sizes, and a solution containing unreacted CdCl2 inside vesicles, were analyzed using cryo-transmission electron microscopy (cryo-TEM). Cryo-TEM has proved capable of resolving both the vesicle bilayer and the encapsulated nanocrystal, and yields previously unknown positional information for the crystal in relation to the bilayer.Egg-PC vesicles containing Cd2+ were formed by detergent depletion, yielding vesicles of uniform size and a defined internal Cd2+ concentration. External Cd2+ was removed from the solution by cation exchange. Ammonium sulfide was added to the vesicle dispersion to produce nanocrystals via diffusion of S2- across the vesicle membrane. Particle size was predicted based upon the vesicle size, as determined from light scattering, and the encapsulated Cd2+ concentration.

Development of Olanzapine Nano-Emulsion for Enhanced Brain Delivery

2012 ◽  
Vol 5 (1) ◽  
pp. 1648-1659
Author(s):  
Madhusudan Rao Y ◽  
Shailaja M ◽  
Ramakrishna S ◽  
Ramesh G ◽  
K H Reddy ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Particle Size ◽  
Research Work ◽  
Particle Size Analysis ◽  
Correlation Spectroscopy ◽  
Size Analysis ◽  
Uniform Size ◽  
Transmission Electron ◽  
Nano Emulsion

The main objective of the present research work was to design, optimize and characterize olanzapine loaded nano-emulsion for improved brain transport of the drug.   Olanzapine nano-emulsion was formulated using the ultrasonication method. The formulation variables (oil and surfactant) and process variables (ultrasonication time) were optimized by Response surface methodology using the Box-Behnken statistical method. Particle size, polydispersity index (PDI) and zeta potential were measured by photon correlation spectroscopy using a Malvern zeta sizer. Morphology of emulsion droplets was examined by transmission electron microscopy (TEM). Release study was performed and drug release was estimated by HPLC method. Stability studies were performed at 4oC-25oC for a period of three months. The optimized nano-emulsion obtained showed a uniform size distribution with an average size in the range of 65.1 nm to 74.21 nm and surface charge in the range of –18.9 mv to – 25.23 mv. The Transmission electron microscopy studies on olanzapine nano-emulsion revealed a spherical morphology of globules. An average of 91.91% of drug was released from the optimized formulation over a period of 24 hours. The particle size analysis after three months showed no significant change implying that the nano-emulsion was quite stable when stored at room temperature. Stable olanzapine nano-emulsion was formulated. The novel nanoformulation was found to be a potential vehicle for delivery of olanzapine to the brain.

Biomolecule-Assisted Synthesis of Ribbon-Like Sb2S3 Nanostructure

2010 ◽  
Vol 97-101 ◽  
pp. 2144-2147
Author(s):  
Xin Yu Yang ◽  
Wei Dong Xiang ◽  
Xi Yan Zhang ◽  
Hai Tao Liu
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
Sulfur Source ◽  
X Ray ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
High Resolution Tem ◽  
Scanning Electron

L-Cystine was successfully used as a novel kind of sulfur source to synthesize the nanostructure of ribbon-like Sb2S3. The nanoribbons were usually tens of micronmeters in length, typically 100-300 nm in width. The nanostructure of ribbon-like Sb2S3 were examined using diverse techniques including X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), selected-area electron diffraction, and high-resolution TEM.

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.

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.

Phase Transformations in Ti-7w/oMo-3w/oMe Alloy

1974 ◽  
Vol 32 ◽  
pp. 514-515
Author(s):  
S. Fujishiro
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Transmission Electron Microscopy ◽  
Tensile Strength ◽  
Mechanical Processing ◽  
Ray Method ◽  
X Ray ◽  
Transmission Electron ◽  
Water Quench ◽  
Alpha Beta

The mechanical properties of three titanium alloys (Ti-7Mo-3Al, Ti-7Mo- 3Cu and Ti-7Mo-3Ta) were evaluated as function of: 1) Solutionizing in the beta field and aging, 2) Thermal Mechanical Processing in the beta field and aging, 3) Solutionizing in the alpha + beta field and aging. The samples were isothermally aged in the temperature range 300° to 700*C for 4 to 24 hours, followed by a water quench. Transmission electron microscopy and X-ray method were used to identify the phase formed. All three alloys solutionized at 1050°C (beta field) transformed to martensitic alpha (alpha prime) upon being water quenched. Despite this heavily strained alpha prime, which is characterized by microtwins the tensile strength of the as-quenched alloys is relatively low and the elongation is as high as 30%.

Sign in / Sign up

Export Citation Format

Share Document