Deposition of novel nanocomposite films by a newly developed differential pumping co-sputtering system

Use of the electron microscope to examine wet objects is possible due to the small mass thickness of the equilibrium pressure of water vapor at room temperature. Previous attempts to examine hydrated biological objects and water itself used a chamber consisting of two small apertures sealed by two thin films. Extensive work in our laboratory showed that such films have an 80% failure rate when wet. Using the principle of differential pumping of the microscope column, we can use open apertures in place of thin film windows.Fig. 1 shows the modified Siemens la specimen chamber with the connections to the water supply and the auxiliary pumping station. A mechanical pump is connected to the vapor supply via a 100μ aperture to maintain steady-state conditions.

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Residual Gas Reaction in the Electron Microscope: II The Design of a Gas-Control Chamber for Quantitative Observations

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100062324 ◽

1969 ◽

Vol 27 ◽

pp. 82-83

Author(s):

Chester J. Calbick ◽

Richard E. Hartman

Keyword(s):

Electron Beam ◽

Electron Microscope ◽

Local Environment ◽

Chamber Pressure ◽

Objective Lens ◽

Ion Pump ◽

Quantitative Studies ◽

Precise Knowledge ◽

Differential Pumping ◽

And Control

Quantitative studies of the phenomenon associated with reactions induced by the electron beam between specimens and gases present in the electron microscope require precise knowledge and control of the local environment experienced by the portion of the specimen in the electron beam. Because of outgassing phenomena, the environment at the irradiated portion of the specimen is very different from that in any place where gas pressures and compositions can be measured. We have found that differential pumping of the specimen chamber by a 4" Orb-Ion pump, following roughing by a zeolite sorption pump, can produce a specimen-chamber pressure 100- to 1000-fold less than that in the region below the objective lens.

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Modulated structures in (Bi,Pb)-Sr-Ca-Cu-O films

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100173443 ◽

1990 ◽

Vol 48 (4) ◽

pp. 62-63

Author(s):

Shozo Ikeda ◽

Hirotoshi Hayakawa ◽

Daniel R. Dietderich

Keyword(s):

Rf Magnetron Sputtering ◽

Potential Method ◽

High Tc ◽

Bscco System ◽

Heat Treated ◽

Modulated Structures ◽

High Tc Phase ◽

Deposited Films ◽

Sputtering System

Pb addition makes easier to form the high Tc phase in the BSCCO system. However, Pb easily vaporized at high temperature. A controlled Pb potential method has been applied to grow the high Tc phase in films. Initially, films are deposited on cleaved MgO substrates using an rf magnetron sputtering system. These amorphous as-deposited films are heat treated in a sealed gold capsule along with a large pellet of Pb-added BSCCO. Details of the process and characterization of the films have been reported elsewhere (1). Films trated for 0.5h at 850° C contain mainly the low Tc phase with a small amount of the high Tc phase. Hawever, films treated for 3h at 850°C consist mainly of the high Tc phase. This film is superconductive with a Tc(zero) of 106K. The Pb/Bi ratio of the films, analysed by SEM- EDS, are 0.12 and 0.18 for heat tratment times of 0.5 and 3h, respectively. The present study investigates the modulated structures of these films using HREM.

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STRUCTURE AND MECHANICAL PROPERTIES OF Nb-Al-N NANOCOMPOSITE FILMS AS A FUNCTION OF THE DEPOSITION PARAMETERS

High Temperature Material Processes (An International Quarterly of High-Technology Plasma Processes) ◽

10.1615/hightempmatproc.2016015994 ◽

2015 ◽

Vol 19 (2) ◽

pp. 179-187 ◽

Cited By ~ 2

Author(s):

Volodymyr Ivashchenko ◽

Vladyslav Rogoz ◽

Pavlo Skrynskiy ◽

Czeslaw Kozak ◽

Marek Opielak

Keyword(s):

Mechanical Properties ◽

Nanocomposite Films ◽

Deposition Parameters

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Formulation and Evaluation of Chitosan-Polyaniline Nanocomposites for Controlled Release of Anticancer Drug Doxorubicin

International Journal of Drug Delivery Technology ◽

10.25258/ijddt.v8i2.13874 ◽

2018 ◽

Vol 8 (2) ◽

Author(s):

Dillip Kumar Behera ◽

Kampal Mishra ◽

Padmolochan Nayak

Keyword(s):

Tensile Strength ◽

Drug Release ◽

Nanocomposite Films ◽

Casting Method ◽

Sustained Drug Release ◽

In Vitro Drug Release ◽

Clay Particles ◽

Solution Casting Method ◽

Nanoclay Content

In this present work, chitosan (CS) crosslink with polyaniline (PANI) with montmorilonite (MMT) called as (CSPANI/MMT) and CS crosslink with PANI without MMT called as (CS-PANI) were prepared by employing the solution casting method. Further the formation of nanocomposites CS-PANI/MMT and CS-PANI were investigated using XRD, FTIR, SEM and tensile strength. Water uptake and swelling ratio of the CS-PANI and CS-PANI/MMT were found to decrease with increase in concentration of clay. Mechanical properties of the CS-PANI and CS-PANI/MMT were assessed in terms of tensile strength and extensibility using texture analyzer. Increase in tensile strength and reduction in extensibility was reported with increase in the nanoclay content. In vitro drug release study on CS-PANI and CS-PANI/MMT indicated pronounced sustained release of doxorubicin by the incorporation of clay particles in the CS polymer matrix. Overall CSPANI/MMT nanocomposite films exhibited improved mechanical and sustained drug release properties than CS-PANI.

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Nanocomposites: - A Recent Overview

Global Journal of Medical Research ◽

10.34257/gjmrbvol20is7pg9 ◽

2020 ◽

pp. 9-21

Author(s):

Pavan C ◽

Madhavi BLR

Keyword(s):

Targeted Drug Delivery ◽

Current Trend ◽

Nanocomposite Films ◽

Cancer Drug ◽

Preparation Methods ◽

Standard Material ◽

Global Issues ◽

Sustainable Solutions ◽

Anti Cancer ◽

Treatment And Diagnosis

Nanocomposites are substances that incorporate nanoparticles (0.5-5% by weight) into a matrix of standard material, which enhances the mechanical strength, toughness including thermal or electrical conductivity and other properties. Nanocomposites are versatile in terms of their applications such as anti-corrosive, healing of bones, sensors, environmental protection, packaging, wastewater treatment, and diagnosis of tumors and other diverse uses. They may be fabricated by blending nanofillers with a polymer to produce a composite. The current trend of processing is by polymerizing monomers. Nanocomposites serve as sustainable solutions to curb global issues. Evaluation is performed on properties such as mechanical, thermal, dispersion, and toxicological. Some marketed products of nanocomposites include In Mat (coating), FiltekZ350 XT by 3M (tooth fillers), chitosan/organic rectorite nanocomposite films (bactericidal activity), graphene oxide/Carboxymethylcellulose (targeted drug delivery of anti-cancer drug doxorubicin), MD1 Flex, Nano Clean MD1, Plactive TM (Antimicrobial nanocomposites) and NovaProTM(Tooth fillers). This article discusses about Nanocomposites–their types, preparation methods, recent research and applications.

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