Top PDF Electron microscope investigation of silver halide crystals

Electron microscope investigation of silver halide crystals

Electron microscope investigation of silver halide crystals

the CYLINDER CONTROL KNOB,, SPECIMEN HOLDER using Remove depress not RELEASE BUTTON plastic specimen move i.. the assembly pin.[r]

44 Read more

AN INVESTIGATION ON THE CYTOTOXICITY AND APOPTOTIC EFFECT OF BIOLOGICALLY SYNTHESIZED SILVER NANOPARTICLES ON MCF-7 AND A549 CELL LINES USING WEED SETARIA VERTICILLATA L.A. Prabhu, K. Shankar*, P. Muthukrishnan, A. Kathiresan & P.PrakashDOWNLOAD/VIEW

AN INVESTIGATION ON THE CYTOTOXICITY AND APOPTOTIC EFFECT OF BIOLOGICALLY SYNTHESIZED SILVER NANOPARTICLES ON MCF-7 AND A549 CELL LINES USING WEED SETARIA VERTICILLATA L.A. Prabhu, K. Shankar*, P. Muthukrishnan, A. Kathiresan & P.PrakashDOWNLOAD/VIEW

Cancer is one of deadliest diseases in the world. Cancer is the uncontrolled growth of abnormal cells in our body. It divides and spread to adjacent tissues and creates tumours. There are nearly hundreds of cancer types out of this lung and breast cancer is important one. Most of the cancer patients are affected by breast and lung cancer. Nowadays chemotherapeutic drugs are high-cost, high toxicity and many side effects. Bio synthesized nanoparticles are the very important drug for cancer and variety of diseases. Treatments like chemotherapy[16] and radiation therapy [17] kills both normal and cancer cells, even chemotherapeutic agents can be combined with nanomaterials for cancer therapy. Researchers around the world are working to find out the novel tools for cancer therapy. SERS-encoded magnetic silver nanoparticles was produced and tested for multifunctional tags for cancer cell target[18]. In recent years, many new anticancer drugs were identified and tested against different cancer cell lines. The silver nanoparticles have best cytotoxic effect against many cancer cells. Setaria verticillata is one of the most important weed plant grown around the world. It consists of phytochemicals such as alkaloid, phenol and tannin [19]. Corrosion studies are carried out by using setaria verticillata as a corrosion inhibitor[19] (Muthukrishnan et al., 2013). In our present study, we reported the characterization of silver nanoparticles by HR-TEM (High-Resolution Transmission Electron Microscope) and SAED (Selected Area Electron Diffraction).The invitro cytotoxic effect of setaria verticillata synthesized silver nanoparticles was tested against MCF-7 (breast cancer cell line) and A549 (lung cancer cell
Show more

7 Read more

Investigation on Comparative Optical Absorption and Luminescent Property of Cerium Doped Potassium Halide Single Crystals S. Bangaru

Investigation on Comparative Optical Absorption and Luminescent Property of Cerium Doped Potassium Halide Single Crystals S. Bangaru

During the last few decades many luminescent studies have been reported on alkali halides doped with rare earth ions [1, 2]. The design of rare earth doped materials with potential application such as optical amplifiers (or) phosphors is an active area of research [3, 4]. Alkali halides have large band gap and simple structure. The lattice parameter of alkali halides are varying from 7.34 Å for RbI to 4.03 Å for LiF. This makes the easy incorporation of dopant ion of different size into them [5-8]. Substitution of impurities in a crystal lattice modifies the optical and other properties of the host. In most cases, the impurities enhance the performance of the host lattice. Potassium halides due their large ionic radius of K + are 1.33 Å permit the substitution of a large number of cations. Cerium is one of the major rare earth ion doped in different host lattice [9-12]. Potassium halides doped with Ce 3+ ions have several technological applications. It forms a highly efficient blue phosphor for display application. Rare earth ions are known to give efficient luminescence and e.g. rare earth doped phosphors are applied in fluorescent lamps (or) in cathode ray tubes [13, 14]. The effect of radiation on the crystal phosphor is to create an electron hole pair followed by a trapping process, by already existing traps (or) induced defects by irradiation. Under an ideal condition, the trapped charge carriers
Show more

8 Read more

THEORY OF PLASTICO ML IN IRRADIATED ALKALI HALIDE CRYSTALS

THEORY OF PLASTICO ML IN IRRADIATED ALKALI HALIDE CRYSTALS

ML has many potentially important applications. It provides a self-indicating method of monitoring the microscopic and macroscopic processes occurring during deformation and fracture of solids. With the fast film now available, it would be possible to photograph the active areas of the crystals by their own ML-created light. ML experiments provides a unique source of information on the nature of colour centres located near the dislocations. It is useful in determining the electronic structure of dislocation in alkali halide crystals. The observed energies of activation of 0.08, 0.12, 0.05 and 0.10 eV for the ML in γ− irradiated KCl, KBr, KI and NaCl crystals have been interpreted by Shmurak and co-workers [ Molotskii et al (1989) ] as the energy gap between the ground state of an F-centre and bottom of the unoccupied dislocation zone. The experiments on
Show more

8 Read more

Synthesis and Characterization of Nano Materials by EBL

Synthesis and Characterization of Nano Materials by EBL

It seen from the SEM images that the distribution of the nano sillimanite tiles of 50 nm is uniform throughout the scanned surface area. It is seen from the image that 50nm cubes are clearly visible. The white spotted areas indicate that the presence of nano sillimanite tiles whereas the dark area indicate silicon nitride wafer. From the AFM images it is seen almost a flat surface except with some valleys. It has very good adhesiveness property with the tip of the cantilever beam of the atomic force microscope. The combination and presence of two ceramic materials will give almost zero surface roughness i.e 1.21 nm which is almost negligible. The maximum surface roughness at the peaks and valleys is 12.4 nm.
Show more

6 Read more

Photodeposition of Ag2S on TiO2 nanorod arrays for quantum dot sensitized solar cells

Photodeposition of Ag2S on TiO2 nanorod arrays for quantum dot sensitized solar cells

interfacial charge transfer [11]. For the latter, one- dimensional oriented arrays (nanotube or nanorod arrays) possess large surface area and efficient electron transfer property that can be employed to improve the performance of QDSSCs [12,13]. Importantly, the high- oriented arrays provide uniform pore size that is favor- able for QD anchoring with rare pore blocking.

7 Read more

Micro-circuit reticle fabrication: an investigation of a silver halide emulsion as a portable conformable mask

Micro-circuit reticle fabrication: an investigation of a silver halide emulsion as a portable conformable mask

increased sensitivity the of halide silver to grains xenon a O 1 source as thereby sensitivity to compared the a The radiation must be amount system of the image emulsion plate design ti[r]

65 Read more

Mechanically-Stimulated Luminescence in Coloured
Alkali Halide Crystals

Mechanically-Stimulated Luminescence in Coloured Alkali Halide Crystals

(1) A theoretical approach based on the transfer of electrons from F-centres to the dislocation band during the mechanical interaction of moving dislocations with F-centres, is made which is successful in explaining several paramenters of the ML in coloured alkali halide crystals.

5 Read more

AN ELECTRON MICROSCOPE STUDY OF THE FETAL DEVELOPMENT OF HUMAN LUNG

AN ELECTRON MICROSCOPE STUDY OF THE FETAL DEVELOPMENT OF HUMAN LUNG

AN ELECTRON MICROSCOPE STUDY OF THE FETAL DEVELOPMENT OF. Services[r]

21 Read more

Studying Performance of Dubinin-astakhov and Dubinin-raduchkevic Equations to Evaluate Nanopore Volume and Pore Size of MCM-41 Particles (TECHNICAL NOTE)

Studying Performance of Dubinin-astakhov and Dubinin-raduchkevic Equations to Evaluate Nanopore Volume and Pore Size of MCM-41 Particles (TECHNICAL NOTE)

The textural properties and structure of MCM-41 particles were characterized by X- ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM) and[r]

8 Read more

Ag-Mn Mixed Tartrate Crystals: A Growth and Spectrometric Studies

Ag-Mn Mixed Tartrate Crystals: A Growth and Spectrometric Studies

Interest in the morphology of crystals started in 17 th century when Kepler [16] observed dendritic snow crystals in 1611 and Steno [17] was attracted by variety of polyhedral forms of rock crystals[18-19]. Different types of tartrate crystals can be grown in hydro silica gel with the help of single diffusion technique[2]. Mainly tartrate crystals have attracted attention due to their interesting physical properties and application like dielectric and ferroelectric[20-23]. Growth and characterization of pure and mixed crystals were reported earlier by many researchers[24-27].
Show more

5 Read more

Polymer-Silica Nanocomposites: a Versatile Platform for Multifunctional Materials.

Polymer-Silica Nanocomposites: a Versatile Platform for Multifunctional Materials.

The propagation of cracks within sol-gel monolith during drying and annealing processes has been observed before. 15-18 During the drying process, the volume of sol-gel decreases due to large capillary forces from solvent vaporization and additional polycondensation reaction. According to Gibbs-Kelvin equation, different shrinkage between the interior and exterior of a drying sol-gel sample may build up stress 19, 20 . If the drying rate is increased, cracks will develop when it reaches to a critical value. Thus, when solvent evaporation rate increases, the interior tensile stress and the probability of cracking increase. Such stress has been shown to be as high as 100 MPa. 19 These microscopic cracks occasionally merge together, resulting in macroscopic cracks and monolith disintegration. When annealing at 160 °C, few new cracks developed possibly due to the presence of more ductile silver phase. We have confirmed on SEM that both micro-size and macro-size cracks are present on cross-sectional surface (Figure 3.5b). Due to large void spaces at the macrocrack sites, silver layer appears to be thicker at the crack surfaces.
Show more

180 Read more

Electron Microscope Study of Ribonucleic Acid of Myxoviruses

Electron Microscope Study of Ribonucleic Acid of Myxoviruses

The present studies were extended to include examination of incomplete virus RNA, some physicochemical properties of the viral genome, and determination of length measurements for molecu[r]

7 Read more

Structure and Development of Viruses as Observed in the Electron Microscope

Structure and Development of Viruses as Observed in the Electron Microscope

In contrast to adenovirus, whose core material can actually be observed at stages of release from capsids close to the nucleus 6, the deoxyribonucleoprotein of herpes simplex virus appea[r]

9 Read more

STUDY OF HEATED JUICES AND TINY PARTICLES OF FRUITS BY MICROSCOPE AND SCANNING ELECTRON MICROSCOPE

STUDY OF HEATED JUICES AND TINY PARTICLES OF FRUITS BY MICROSCOPE AND SCANNING ELECTRON MICROSCOPE

The surface morphology of juice samples were obtained by scanning electron microscope. (SEM) The dried juice samples of beetroot and carrot showing sand pebbles like surface morphology the heated juice of sweetpotato showing irregular flakes like surface morphology.

7 Read more

Forensic Applications of the Scanning Electron Microscope

Forensic Applications of the Scanning Electron Microscope

It has been accepted for inclusion in Journal of Criminal Law and Criminology by an authorized editor of Northwestern University School of Law Scholarly Commons.... Tim TounNAL o7 Canun [r]

7 Read more

AN ELECTRON MICROSCOPE STUDY OF ISOLATED CHROMOSOMES

AN ELECTRON MICROSCOPE STUDY OF ISOLATED CHROMOSOMES

That one (Plate VIII, fig. 66) shows that the structure of the pachy- tene chromosome of Lilium pollen mother cells is not very different from the structure of the resting c[r]

6 Read more

Mechanoluminescence Studies of Gamma Irradiated
Sodium Chloride Single Crystals and Microcrystalline
Powder Doped with Terbium

Mechanoluminescence Studies of Gamma Irradiated Sodium Chloride Single Crystals and Microcrystalline Powder Doped with Terbium

In alkali halide crystals, the electron dislocation band lies just above the F-centre level where the energy gap between the bottom of the dislocation band and ground state of an F-centre is of the order of 0.10 eV 37, 38 . Near an edge dislocation, some of F-centres lie in the compression region and some of them lie in the expansion region. As the energy gap between two levels in alkali halide crystals decreases with decrease in the local density of crystals, the energy gap between dislocation band and ground state of F-centre may increase in the compression region due to the increase in local density of the crystals. The electrons captured by a dislocation have a finite lifetime. If the moving dislocation containing electrons encounters the defect centers containing holes, the dislocation electrons may be captured by these centres and luminescence may arise due to the radiative recombination of electrons from F-centres with the hole in V 2 centres. Schematically, the ML process
Show more

8 Read more

Abstract: Because this issue journal is dedicated to Gelatin here we present a few applications of

Abstract: Because this issue journal is dedicated to Gelatin here we present a few applications of

Keywords: Gelatin; photosensitive materials; silver halide photographic emulsion; dichromated.. 23.[r]

24 Read more

Interfacial Bonding Mechanism Using Silver Metallo Organic Nanoparticles to Bulk Metals and Observation of Sintering Behavior

Interfacial Bonding Mechanism Using Silver Metallo Organic Nanoparticles to Bulk Metals and Observation of Sintering Behavior

In order to verify the relationship between the exothermal reaction and the sintering process in detail, the sintering behaviors of silver metallo-organic nanoparticles were observed using FE-SEM. FE-SEM images of silver metal- lo-organic nanoparticles heated up to various temperatures in air and argon atmosphere are shown in Figs. 5 and 6. The silver particles heated up to 523 K in air were isolated each other, though the silver grain sizes were larger than those in initial state. In air, silver particles heated up to 573 K after the first exothermal reaction significantly grew than that heated up to 523 K, while small silver particles still existed. These small particles disappeared when heated up to 623 K after the second exothermal peak. On the other hand, in argon atmosphere, although the sintering of silver particles con- tinuously proceeded, the grain sizes of the particles heated up to 673 K were still around 100 nm and isolated. It is considered that the organic shells still remained. This can be caused by an insufficient oxygen partial pressure in argon atmosphere. These results reveal that the exothermal reaction in air is the oxidation reaction of the organic shells, and removing the organic shells makes sintering silver particles accelerate. In addition, the sintered silver became denser by progress of sintering. It is thought that this densification process is very important for applying the silver metallo- organic nanoparticles to bonding.
Show more

9 Read more

Show all 10000 documents...