Influence of Ion Irradiation on the Surface Properties of Silver-Coated Flexible PDMS Polymeric Films

2021 ◽  
Vol 52 (1) ◽  
Author(s):  
A. Atta ◽  
E. Abdeltwab
Keyword(s):  
Surface Properties ◽  
Ion Irradiation ◽  
Polymeric Films

Swift heavy ion irradiation-induced modifications in the electrical and surface properties of β-Ga2O3

2020 ◽  
Vol 117 (14) ◽  
pp. 142105
Author(s):  
N. Manikanthababu ◽  
B. R. Tak ◽  
K. Prajna ◽  
S. Sarkar ◽  
K. Asokan ◽  
...  
Keyword(s):  
Surface Properties ◽  
Ion Irradiation ◽  
Heavy Ion ◽  
Swift Heavy Ion Irradiation ◽  
Heavy Ion Irradiation ◽  
Swift Heavy Ion

Self-organised patterns in polymeric films solidified from diluted solutions – The effect of the substrate surface properties

2014 ◽  
Vol 78 ◽  
pp. 615-623 ◽  
Author(s):  
Antonín Minařík ◽  
Magda Rafajová ◽  
Eliška Rajnohová ◽  
Petr Smolka ◽  
Aleš Mráček
Keyword(s):  
Surface Properties ◽  
Substrate Surface ◽  
Polymeric Films

scholarly journals Production and Characterization of Glutathione-Chitosan Conjugate Films as Systems for Localized Release of Methotrexate

Polymers ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2032
Author(s):  
Yhors Ciro ◽  
John Rojas ◽  
Cristian J. Yarce ◽  
Constain H. Salamanca
Keyword(s):  
Contact Angle ◽  
Surface Properties ◽  
Polymer Films ◽  
Sessile Drop ◽  
Spreading Rate ◽  
Delivery Systems ◽  
Polymeric Films ◽  
Work Of Adhesion ◽  
Release Mechanism ◽  
Promising Alternative

Cancer is one of the most serious public health problems that affect humanity. Diverse delivery systems of anticancer drugs have been developed to enhance the treatment effectiveness and patient compliance. Thus, drug delivery systems from polymeric films could be an interesting and promising alternative, especially for skin chemotherapeutics. In this work, polymeric films based on glutathione-chitosan conjugates with degrees of thiolation of 4.4%, 5.1% and 7.0% were synthetized by casting-evaporation method and subsequent loading with methotrexate. The surface properties of these films were evaluated by contact angle and spreading rate measurements. The sessile drop methods along with the thermodynamic parameter of work of adhesion were determined using the Young–Dupré semi-empirical model. The in vitro methotrexate release was assessed at a pH of 4.5 and 7.4 simulating physiological conditions. Data from the resulting profiles were fitted to the order one, Higuchi, Peppas–Sahlin and Korsmeyer–Peppas kinetic models. The results suggest a strong relationship between the thiolation degree and hydrophilic surface properties such as contact angle and water spreading rate, whereas the work of adhesion was not significantly affected. Further, these polymer films could control the methotrexate release through diverse mechanisms such as diffusion and relaxation depending on the thiolation degree and the aqueous medium employed. In fact, as thiolation degree increased, the release mechanism shifted from a primary diffusional type towards a predominant relaxation-driven mechanism. These polymer films could be used as modified systems for anticancer local delivery.

Effects of sequential He+ and Ar+ implantation on surface properties of polymers

1996 ◽  
Vol 11 (10) ◽  
pp. 2661-2667 ◽  
Author(s):  
Gopal R. Rao ◽  
Eal H. Lee
Keyword(s):  
Wear Resistance ◽  
Surface Properties ◽  
Ion Irradiation ◽  
Surface Hardness ◽  
Wear Test ◽  
Surface Region ◽  
Near Surface ◽  
Ether Ether Ketone ◽  
Poly Ether Ether Ketone ◽  
Hardness Increase

Three important polymers: polystyrene (PS), poly ether ether ketone (PEEK), and polyimide Kapton, were irradiated separately with 1 MeV He+, 1 MeV Ar+, and 1 MeV He+ followed by 1 MeV Ar+ sequentially, to a fluence of 3 × 1019 ions/m2 for each ion. The specimens were characterized for changes in surface hardness using a nanoindentation technique, and wear resistance using a reciprocating sliding wear apparatus with a steel ball counterface. Results indicated that while all polymers showed higher hardness values after ion irradiation, the dual irradiation resulted in the largest hardness increase, greater than for the single ion-irradiated specimens. Wear test results also indicated that the dual He+ + Ar+ irradiation resulted in the best improvement in wear resistance of the polymers. These improvements in properties are a consequence of cross-linking of the polymer material caused by the ion irradiation. Linear energy transfer considerations showed that the dual He+ + Ar+ implantation was better because it combined a deeper implant, in the form of He, along with Ar irradiation which resulted in a shallower but more highly cross-linked layer at the near surface. Thus a deeper and graded cross-linked surface region was formed. The study shows that there is greater flexibility for tailoring surface properties of polymers by using a judicious combination of ion species, ion energies, and fluences.

Tuning the surface properties of hydrogel at the nanoscale with focused ion irradiation

Soft Matter ◽  
2014 ◽  
Vol 10 (42) ◽  
pp. 8448-8456 ◽  
Author(s):  
Y. Kim ◽  
A. Y. Abuelfilat ◽  
S. P. Hoo ◽  
A. Al-Abboodi ◽  
B. Liu ◽  
...  
Keyword(s):  
Tissue Engineering ◽  
Surface Morphology ◽  
Surface Properties ◽  
Focused Ion Beam ◽  
Ion Irradiation ◽  
Ion Beam ◽  
Site Specific ◽  
Micro Scale ◽  
Physical Attributes

With the site-specific machining capability of Focused Ion Beam (FIB) irradiation, we aim to tailor the surface morphology and physical attributes of biocompatible hydrogel at the nano/micro scale particularly for tissue engineering and other biomedical studies.

Biological and Surface Properties of C-Type Virus Particles Produced by Novikoff Ascites Hepatoma Cells

1977 ◽  
Vol 35 ◽  
pp. 388-389
Author(s):  
D.C. Hixson ◽  
J.C. Chan ◽  
J.M. Bowen ◽  
E.F. Walborg
Keyword(s):  
Surface Properties ◽  
Ricinus Communis ◽  
Rat Kidney ◽  
Leukemia Virus ◽  
Viral Envelope ◽  
Virus Particles ◽  
Chemically Induced ◽  
Sarcoma Virus ◽  
Hepatocarcinoma Cells ◽  
Type C

Several years ago Karasaki (1) reported the production of type C virus particles by Novikoff ascites hepatocarcinoma cells. More recently, Weinstein (2) has reported the presence of type C virus particles in cell cultures derived from transplantable and primary hepatocellular carcinomas. To date, the biological function of these virus and their significance in chemically induced hepatocarcinogenesis are unknown. The present studies were initiated to determine a possible role for type C virus particles in chemically induced hepatocarcinogenesis. This communication describes results of studies on the biological and surface properties of type C virus associated with Novikoff hepatocarcinoma cells.Ecotropic and xenotropic murine leukemia virus (MuLV) activity in ascitic fluid of Novikoff tumor-bearing rats was assayed in murine sarcoma virus transformed S+L- mouse cells and S+L- mink cells, respectively. The presence of sarcoma virus activity was assayed in non-virus-producing normal rat kidney (NRK) cells. Ferritin conjugates of concanavalin A (Fer-Con wheat germ agglutinin (Fer-WGA), and Ricinus communis agglutinins I and II (Fer-RCAI and Fer-RCAII) were used to probe the structure and topography of saccharide determinants present on the viral envelope.

Effets of surfaces on precipitate morphology in irradiated thin foils

1978 ◽  
Vol 36 (1) ◽  
pp. 654-655
Author(s):  
D.I. Potter ◽  
A. Taylor
Keyword(s):  
Ion Irradiation ◽  
Dark Field Image ◽  
Thin Foil ◽  
Dark Field ◽  
Al Alloy ◽  
Bright Field Image ◽  
Dislocation Loops ◽  
Precipitate Morphology ◽  
Thin Foils

Thermal aging of Ni-12.8 at. % A1 and Ni-12.7 at. % Si produces spatially homogeneous dispersions of cuboidal γ'-Ni3Al or Ni3Si precipitate particles arrayed in the Ni solid solution. We have used 3.5-MeV 58Ni+ ion irradiation to examine the effect of irradiation during precipitation on precipitate morphology and distribution. The nearness of free surfaces produced unusual morphologies in foils thinned prior to irradiation. These thin-foil effects will be important during in-situ investigations of precipitation in the HVEM. The thin foil results can be interpreted in terms of observations from bulk irradiations which are described first.Figure 1a is a dark field image of the γ' precipitate 5000 Å beneath the surface(∿1200 Å short of peak damage) of the Ni-Al alloy irradiated in bulk form. The inhomogeneous spatial distribution of γ' results from the presence of voids and dislocation loops which can be seen in the bright field image of the same area, Fig. 1b.

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