scholarly journals Fabrication of Mesostructured Silica and Titania Rods on Substrates by Using Polycarbonate Membranes

2010 ◽  
Vol 2010 ◽  
pp. 1-4 ◽  
Author(s):  
Norihiro Suzuki ◽  
Yusuke Yamauchi
Keyword(s):  
Electron Microscope ◽  
Longitudinal Axis ◽  
Sem Images ◽  
One Pot ◽  
Polycarbonate Membrane ◽  
Entire Area ◽  
Transmission Electron ◽  
Polycarbonate Membranes ◽  
Fibrous Morphology ◽  
Oriented Parallel

By using the polycarbonate membrane a template, mesoporous silica rods are fabricated on a silicon substrate in one pot. From scanning electron microscope (SEM) images, the creation of fibrous morphology is confirmed over the entire area. The diameter of the obtained rods is consistent with that of the template. Transmission electron microscope (TEM) images revealed that the tubular mesochannels are uniaxially oriented parallel to the longitudinal axis of the silica rods. The mesoporous titania rods with anatase crystalline frameworks are also fabricated.

scholarly journals CENTROSOMES AND MICROTUBULES DURING MEIOSIS IN THE MUSHROOM BOLETUS RUBINELLUS

1971 ◽  
Vol 50 (3) ◽  
pp. 737-745 ◽  
Author(s):  
David J. McLaughlin
Keyword(s):  
Electron Microscope ◽  
Longitudinal Axis ◽  
Spindle Pole ◽  
Middle Part ◽  
Prophase I ◽  
Cytoplasmic Microtubules ◽  
Oriented Parallel ◽  
Relationship Of ◽  
The Relationship

The double centrosome in the basidium of Boletus rubinellus has been observed in three planes with the electron microscope at interphase preceding nuclear fusion, at prophase I, and at interphase I. It is composed of two components connected by a band-shaped middle part. At anaphase I a single, enlarged centrosome is found at the spindle pole, which is attached to the cell membrane. Microtubules mainly oriented parallel to the longitudinal axis of the basidium are present at prefusion, prophase I and interphase I. Cytoplasmic microtubules are absent when the spindle is present. The relationship of the centrosome in B. rubinellus to that in other organisms and the role of the cytoplasmic microtubules are discussed.

Investigation on structure of BaTi1−x NbxO3 compound prepared by rotary-hydrothermal synthesis methods

2014 ◽  
Vol 32 (3) ◽  
pp. 430-435 ◽  
Author(s):  
Arsia Khanfekr ◽  
Morteza Tamizifar ◽  
Rahim Naghizadeh
Keyword(s):  
Electron Microscope ◽  
Hydrothermal Reaction ◽  
Phase Evolution ◽  
Synthesis Methods ◽  
Structure And Properties ◽  
X Ray Diffraction ◽  
Sem Images ◽  
X Ray ◽  
Transmission Electron ◽  
Diffraction Patterns

AbstractBaTi1−x NbxO3 compounds (with x = 0.0, 0.01, 0.03, 0.06, and 0.09) were synthesized by rotary-hydrothermal (RH) method. The process was conducted at 180 °C for 5 hours in a Teflon vessel that was rotated at a speed of 160 rpm during the hydrothermal reaction. The effects of donor concentration on the structure and properties of BaTi1−x NbxO3 compounds were investigated. The experiments for the BaTiO3±Nb2O3 system produced by a solid state reaction at high temperature at different concentrations of niobium, with the use of RH processing have not been reported in previous works. For the phase evolution studies, X-ray diffraction patterns (XRD) were analyzed and Raman spectroscopy measurements were performed. The transmission electron microscope (TEM) and the field emission scanning electron microscope (FE-SEM) images were taken for the detailed analysis of the grain size, surface and morphology of the compound.

Preparation and Structure of BiVO4-Graphene Composites

2014 ◽  
Vol 905 ◽  
pp. 101-104 ◽  
Author(s):  
Bin Zhang ◽  
Ya Ling Wang ◽  
Lang Huan Huang ◽  
Shao Zao Tan
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Electron Microscope ◽  
Hydrothermal Synthesis ◽  
Emission Spectroscopy ◽  
Synthesis Method ◽  
Photoelectron Emission ◽  
One Pot ◽  
X Ray ◽  
Transmission Electron

BiVO4-graphene composites were prepared through a one-pot hydrothermal synthesis method, and the structure were investigated by Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron emission spectroscopy (XPS), X-ray powder diffraction (XRD) and Transmission electron microscope (TEM). The results show that BiVO4-graphene composites are successfully prepared, and BiVO4 particles are almost uniformly deposited on the surface of graphene.

scholarly journals Synthesis and Optical Characterization of Europium Doped MY2O4 (M = Mg, Ca, and Sr) Nanophosphors for Solid State Lightening Applications

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Devender Singh ◽  
Vijeta Tanwar ◽  
Shri Bhagwan ◽  
Vandna Nishal ◽  
Suman Sheoran ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Emission Spectra ◽  
Main Peak ◽  
X Ray Diffraction ◽  
Sem Images ◽  
Morphological Studies ◽  
Transmission Electron ◽  
Gel Combustion ◽  
Red Luminescence ◽  
Host Lattices

Trivalent europium doped yttriate nanophosphors were synthesized by rapid facile gel combustion technique. The photoluminescence (PL) properties of these Eu3+ activated MY2O4 (M = Mg, Ca, and Sr) nanophosphors showed red luminescence and exhibited excellent emission properties in their respective regions of color coordinates. Based on the excitation wavelengths multiple emission peaks were obtained. The main peak in the emission spectra was ascribed to 5D0→7F2 transition of Eu3+ ion. The structural and morphological studies were performed by the measurements of X-ray diffraction profiles, scanning electron microscope (SEM) images, and transmission electron microscope (TEM) micrographs. Furthermore, the effects of additional heating on the different host lattices of these phosphors were also studied.

Fabrication of Lignin-Wrapped Carbon Nanotubes and its Dispersion in ABS Resin

2012 ◽  
Vol 455-456 ◽  
pp. 87-90
Author(s):  
Xian Xun Ge ◽  
Jia Hao Qiu ◽  
Sha Sha Xu ◽  
Feng Yue ◽  
Pin Gan Song
Keyword(s):  
Carbon Nanotubes ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Tensile Stress ◽  
Transmission Electron Microscope ◽  
Sem Images ◽  
Transmission Electron ◽  
Pristine Cnts ◽  
Abs Resin ◽  
Scanning Electron

In the presented work, the carbon nanotubes (CNTs) were successfully wrapped with alkli lignin. Both transmission electron microscope (TEM) and scanning electron microscope (SEM) observations show that the CNTs are coated with a layer of lignin, which is also verified by Raman spectra. SEM images demonstrate that lignin-wrapped CNTs (lignin-w-CNTs) can more uniformly dispersed in ABS matrix relative to pristine CNTs. Moreover, compared with CNTs and lignin, incorporating lignin-w-CNTs results in slightly higher tensile stress at the same loading level.

scholarly journals Quenched/unquenched nano bioactive glass-ceramics: Synthesis and in vitro bioactivity evaluation in Ringer’s solution with BSA

2013 ◽  
Vol 19 (2) ◽  
pp. 231-239 ◽  
Author(s):  
Nima Nabian ◽  
Maedeh Delavar ◽  
Mahmood Rabiee ◽  
Mohsen Jahanshahi
Keyword(s):  
Electron Microscope ◽  
Bioactive Glass ◽  
Glass Ceramic ◽  
Sol Gel ◽  
Glass Ceramics ◽  
Apatite Formation ◽  
In Vitro Bioactivity ◽  
Sem Images ◽  
Transmission Electron

The paper reports the first attempt at changing cooling treatment of synthesizing method in order to investigate its effect on the physical properties of sol-gel derived nano bioactive glass-ceramic in the system 58SiO2-33CaO-9P2O5 (wt.%). We hypothesized that the method of cooling may affect the properties of nano bioactive glass-ceramic. To test this hypothesis, two different method of cooling treatment was applied after calcinations in synthesizing method. Both quenched and unquenched nano bioactive glass-ceramics were soaked in Ringer?s solution with bovine serum albumin (BSA) for bioactivity evaluation. The obtained samples were analyzed for their composition, crystalinity and morphology through X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), surface electron microscope (SEM) and transmission electron microscope (TEM). The SEM images showed that the morphology of nano bioactive glass-ceramics was completely changed by quenching process. Results of in vitro bioactivity evaluation revealed that the unquenched attains faster apatite formation ability than the quenched sample. Other properties of these two morphologically different nano bioactive glass-ceramics were strongly discussed.

scholarly journals Synthesis, Characterization of ZrO2:Tb3+ (1-9 mol %) Nanophosphors for Blue Lighting Applications and Antibacterial Property

2021 ◽  
Vol 12 (6) ◽  
pp. 7147-7158
Keyword(s):  
Electron Microscope ◽  
Diffuse Reflectance Spectroscopy ◽  
Light Sources ◽  
X Ray Diffraction ◽  
Hydrothermal Route ◽  
Sem Images ◽  
X Ray ◽  
Transmission Electron ◽  
Good Homogeneity

This paper reports the structural, morphological, and antibacterial studies of ZrO2:Tb3+ nanophosphors (NPs). The ZrO2:Tb3+ NPs were synthesized by hydrothermal route using Amylamine as surfactant. ZrO2:Tb3+ nanophosphors was characterized by Powder X-ray Diffraction(PXRD), Scanning Electron Microscope (SEM),Diffuse reflectance spectroscopy (DRS), Photoluminescence(PL), Raman spectra, Fourier Transform Infrared radiation(FTIR) and Transmission Electron Microscope(TEM). PXRD analysis shows better crystallinity, cubic in-phase and good homogeneity of the synthesized phosphors were confirmed. When the Tb3+ concentration varies, we obtain blue emissions from ZrO2:Tb3+ NPs. ZrO2:Tb3+ NPs have a promising approach to blue light sources in the display application. SEM images show that ZrO2:Tb3+ nanophosphors have good morphology with a nonporous structure. TEM and SAED pattern confirms that ZrO2:Tb3+ nanophosphors are crystalline in nature. ZrO2:Tb3+ (9mol %) nanophosphors possessed a good antibacterial ability.

NiFe2O4@SiO2 nPr@glucose catalyzed synthesis of novel 5-pyrazolin-1,2,4- triazazolidine-3-ones (thiones)

2020 ◽  
Vol 17 ◽  
Author(s):  
Mohammad Nikpassand ◽  
Zahra Pourkarim
Keyword(s):  
Electron Microscope ◽  
Reaction Times ◽  
High Yield ◽  
Reusable Catalyst ◽  
One Pot ◽  
X Ray ◽  
Transmission Electron ◽  
Elemental Analyses ◽  
Ft Ir ◽  
High Yields

Introduction: NiFe2O4@SiO2nPr@glucose catalyzed synthesis of novel 5-pyrazolin-1,2,4-triazazolidine-3- ones (thiones). Materials and Methods: Amino glucose‐ functionalized silica‐ coated NiFe2O4 nanoparticles (NiFe2O4@SiO2 nPr@glucose amine or NiFe2O4@SiP@GA) were synthesized and characterized by X-ray powder diffraction (XRD), X-ray spectroscopy (EDX), transmission electron microscope (TEM), field emission scanning electron microscope (FE-SEM), vibrating sample magnetometry (VSM) and fourier transform infrared spectroscopy (FT-IR). Results and Discussion: NiFe2O4@SiP@GA supply an eco-friendly procedure for the synthesis of some novel 5- pyrazolin-1,2,4-triazazolidine-3-ones or thiones through one-pot reaction of thiosemicarbazide (hydrazinecarbothioamide) and synthetized pyrazole carbaldehydes. These compounds were obtained in high yields in short reaction times. The catalyst could be easily recovered and reused for six cycles with almost consistent activity. The structures of the synthesized 5-pyrazolin-1,2,4-triazazolidine-3-ones or thiones were confirmed by 1H NMR, 13C NMR and FTIR spectral data and elemental analyses. Conclusion: In conclusion, we have investigated NiFe2O4@SiO2nPr@amino glucose as a new, eco-friendly, inexpensive, mild and reusable catalyst for the synthesis of 5-pyrazolin-1,2,4-triazazolidine-3-ones or thiones. High yield, a simple work‐ up procedure, adherence to the basics of green chemistry, environmental friendly and based on natural ingredients, ease of separation and recyclability of the magnetic catalyst and waste reduction are some advantages of this method.

scholarly journals A cryo-TSEM with temperature cycling capability allows deep sublimation of ice to uncover fine structures in thick cells

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jiro Usukura ◽  
Akihiro Narita ◽  
Tomoharu Matsumoto ◽  
Eiji Usukura ◽  
Takeshi Sunaoshi ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Cell Membrane ◽  
Frozen Section ◽  
Temperature Cycling ◽  
Sem Images ◽  
Simultaneous Acquisition ◽  
Transmission Electron ◽  
New Type ◽  
Fine Structures ◽  
Conventional Transmission Electron Microscope

AbstractThe scanning electron microscope (SEM) has been reassembled into a new type of cryo-electron microscope (cryo-TSEM) by installing a new cryo-transfer holder and anti-contamination trap, which allowed simultaneous acquisition of both transmission images (STEM images) and surface images (SEM images) in the frozen state. The ultimate temperatures of the holder and the trap reached − 190 °C and − 210 °C, respectively, by applying a liquid nitrogen slush. The STEM images at 30 kV were comparable to, or superior to, the images acquired with conventional transmission electron microscope (100 kV TEM) in contrast and sharpness. The unroofing method was used to observe membrane cytoskeletons instead of the frozen section and the FIB methods. Deep sublimation of ice surrounding unroofed cells by regulating temperature enabled to emerge intracellular fine structures in thick frozen cells. Hence, fine structures in the vicinity of the cell membrane such as the cytoskeleton, polyribosome chains and endoplasmic reticulum (ER) became visible. The ER was distributed as a wide, flat structure beneath the cell membrane, forming a large spatial network with tubular ER.

Morphological comparison of Pavo cristatus and Pavo cristatus ALB feather barbules

1994 ◽  
Vol 52 ◽  
pp. 348-349
Author(s):  
M. McKinney ◽  
J. S. Gardner
Keyword(s):  
Electron Microscope ◽  
Light Microscope ◽  
Salt Lake ◽  
Salt Lake City ◽  
Morphological Difference ◽  
Sem Images ◽  
Morphological Comparison ◽  
Transmission Electron ◽  
Pavo Cristatus ◽  
Lake City

It was hypothesized that a morphological difference existed between the feather barbules of the colorful, iridescent peafowl and those of the albino peafowl.Previously molted plume feathers from the Indian (Pavo cristatus) and Albino (Pavo cristatus alb) peafowl were collected from the Tracy Aviary in Salt Lake City, Utah. Segments were selected from the eye region of feathers of both species and they were examined directly with the light microscope (LM). Similar segments were prepared for study with the scanning electron microscope (SEM). Portions of barbs possessing barbules were embedded in Spurr’s resin and sectioned for SEM and transmission electron microscope (TEM) evaluation.With the light microscope it was observed that only the barbules exhibited brilliant colors. The barbs and rachis did not. By changing the position of the light source, the shade and intensity were altered, but not the color.SEM images were collected at low magnification (Figs. 1 and 2). Segmentation of the barbules was observed in both Pavo cristatus and Pavo cristatus alb.

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