scholarly journals Mössbauer studies of iron doped poly(methyl methacrylate) before and after ion beam modification

2001 ◽  
Vol 24 (4) ◽  
pp. 397-400 ◽  
Author(s):  
D. R. S. Somayajulu ◽  
C. N. Murthy ◽  
D. K. Awasthi ◽  
N. V. Patel ◽  
M. Sarkar
Keyword(s):  
Methyl Methacrylate ◽  
Ion Beam ◽  
Mössbauer Studies ◽  
Poly Methyl Methacrylate ◽  
Ion Beam Modification ◽  
Iron Doped ◽  
Before And After

Nanoembossed Polymer Substrates for Biomedical Surface Interaction Studies

2007 ◽  
Vol 7 (12) ◽  
pp. 4588-4594 ◽  
Author(s):  
Christopher A. Mills ◽  
Elena Martinez ◽  
Abdelhamid Errachid ◽  
Elisabeth Engel ◽  
Miriam Funes ◽  
...  
Keyword(s):  
Cell Surface ◽  
Methyl Methacrylate ◽  
Nanoimprint Lithography ◽  
Ion Beam ◽  
Biological Species ◽  
Poly Lactic Acid ◽  
Process Conditions ◽  
Thermoplastic Polymers ◽  
Free Standing ◽  
Poly Methyl Methacrylate

Biomedical devices are moving towards the incorporation of nanostructures to investigate the interactions of biological species with such topological surfaces found in nature. Good optical transparency and sealing properties, low fabrication cost, fast design realization times, and bio-compatibility make polymers excellent candidates for the production of surfaces containing such nanometric structures. In this work, a method for the production of nanostructures in free-standing sheets of different thermoplastic polymers is presented, with a view to using these substrates in biomedical cell-surface applications where optical microscopy techniques are required. The process conditions for the production of these structures in poly(methyl methacrylate), poly(ethylene naphthalate), poly(lactic acid), poly(styrene), and poly(ethyl ether ketone) are given. The fabrication method used is based on a modified nanoimprint lithography (NIL) technique using silicon based moulds, fabricated via reactive ion etching or focused ion beam lithography, to emboss nanostructures into the surface of the biologically compatible thermoplastic polymers. The method presented here is designed to faithfully replicate the nanostructures in the mould while maximising the mould lifetime. Examples of polymer replicas with nanostructures of different topographies are presented in poly(methyl methacrylate), including nanostructures for use in cell-surface interactions and nanostructure-containing microfluidic devices.

A Study on Luminescence Enhancement in Ion Irradiated TiO2/Poly(methyl methacrylate) Nanocomposites

2012 ◽  
Vol 585 ◽  
pp. 139-143 ◽  
Author(s):  
Sarla Sharma ◽  
Rishi Vyas ◽  
Y.K. Vijay
Keyword(s):  
Methyl Methacrylate ◽  
Ion Beam ◽  
Visible Region ◽  
Heavy Ion ◽  
X Ray Diffraction ◽  
Casting Method ◽  
Poly Methyl Methacrylate ◽  
Swift Heavy Ion ◽  
Vis Spectroscopy ◽  
Solution Casting Method

Swift heavy ion induced modification in the optical properties of TiO2/Poly (Methyl methacrylate) nanocomposites is reported in this paper. The as prepared anatase TiO2 nanoparticles were uniformly dispersed in PMMA matrix using solution casting method. These nanocomposites were then irradiated with Ag+12 (120 MeV) ion beam and characterized by X-ray diffraction, scanning electron microscopy, UV-Vis spectroscopy, PL and Raman spectroscopy. The PL spectra exhibited an enhanced broad emission peak in visible region (400 nm - 750 nm) while UV-Vis spectroscopy revealed an increased absorption in visible region in irradiated specimen in comparison to unirradiated sample.

An angled nano-tunnel fabricated on poly(methyl methacrylate) by a focused ion beam

2009 ◽  
Vol 20 (28) ◽  
pp. 285301 ◽  
Author(s):  
Eun Kyu Her ◽  
Hee-Suk Chung ◽  
Myoung-Woon Moon ◽  
Kyu Hwan Oh
Keyword(s):  
Methyl Methacrylate ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Poly Methyl Methacrylate

Effect of Doping different Percentages of Lithium Fluoride on Some Optical Characteristics of Poly-Methyl Methacrylate Polymer

2021 ◽  
Vol 19 (12) ◽  
pp. 15-18
Author(s):  
Ghaidaa Jabbar Habi
Keyword(s):  
Methyl Methacrylate ◽  
Lithium Fluoride ◽  
Optical Characteristics ◽  
Poly Methyl Methacrylate ◽  
Reflectivity Spectra ◽  
Before And After ◽  
Thermal Pressing ◽  
Constant Coefficients ◽  
Pressing Technology

This study implements the optical characteristics of Poly-Methyl methacrylate (PMMA) polymer before and after doping different percentages of Lithium Fluoride (LiF). Where the specimens were formulated as disk shape with diameter of (2.5 cm) and thickness of (0.148 cm) using Thermal pressing technology. The absorbance and reflectivity spectra were recorded in addition to their coefficients at range (300-1100) nm. Also, the study has included the determination of refraction and real and imaginary part of dielectric constant coefficients.

Modeling of low-temperature depolymerization of poly (methyl methacrylate) promoted by ion beam

1999 ◽  
Vol 111 (4) ◽  
pp. 1721-1731 ◽  
Author(s):  
A. Raudino ◽  
M. E. Fragalà ◽  
G. Compagnini ◽  
O. Puglisi
Keyword(s):  
Low Temperature ◽  
Methyl Methacrylate ◽  
Ion Beam ◽  
Poly Methyl Methacrylate

Ion beam enhanced thermal depolymerization of poly(methyl methacrylate)

1999 ◽  
Vol 14 (1) ◽  
pp. 228-231 ◽  
Author(s):  
M. E. Fragalà ◽  
G. Compagnini ◽  
O. Puglisi
Keyword(s):  
Thin Films ◽  
Methyl Methacrylate ◽  
Diffusion Processes ◽  
Ion Beam ◽  
Poly Methyl Methacrylate ◽  
Temperature Range ◽  
Degradation Temperature ◽  
Thermal Depolymerization ◽  
One Step ◽  
And Diffusion

Ion beam enhanced thermal depolymerization of poly(methyl methacrylate) thin films, 1–2 µm thick, has been studied in the temperature range 100–400 °C using a 300 keV He+ beam at very low fluence (5 × 1010−5 × 1011 ions cm−2). A relevant monomer evolution (mass signal m/z = 100) at temperature (150 °C) well below the conventional degradation temperature (360 °C) has been detected during irradiation. The observed phenomenon is discussed in terms of activation energies and diffusion processes within the investigated films. The possibility offered by this phenomenon of performing a microlithography process in only one step is discussed.

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