Nanoindentation test of radiation-modified As<inf>2</inf>S<inf>3</inf> glass after ⁶⁰Co gamma-irradiation

© 2016, Editorial Department of Journal of the Chinese Ceramic Society. All right reserved.The results of the surface mechanical properties (i.e., hardness and elastic modulus) in the unmodified and radiation-modified As2S3 glass measured about 10 years after 60Co γ-irradiation, using a nanoindentation test with an ultra nano hardness tester (UNHT) were reported. It is indicated that the γ-irradiated g-As2S3 (g- for glassy) with the average energy of 60Co γ-quanta of 1.25 MeV and the accumulated dose of 2.41 MGy exhibits the increased surface hardness and elastic modulus values, compared to the unirradiated material, in the range of 200-1 600 nm indentation depth. In the long-term radiation-induced improvement of the surface mechanical properties in g-As2S3, the broader distribution of the experimental data was detected for the irradiated sample with radiation-induced oxidized layer, compared to the clean sample without the layer that was removed by washing and polishing

Carbonization in boron-ion-implanted polymethylmethacrylate as revealed from Raman spectroscopy and electrical measurements

© 2016 Taylor and Francis Group, LLC. The results of Raman spectroscopy and electrical measurements of 40 keV boron-ion-implanted polymethylmethacrylate with ion doses from 6.25 × 1014 to 5.0 × 1016 ions/cm2 are reported for the first time. The Raman spectra recorded in the 400-3800 cm-1 range, showing the formation of new carbon-carbon bands for the as-implanted samples at higher ion doses (>1016 ions/cm2), are found to be an additional support for carbonization processes earlier revealed by slow positrons. The current-voltage dependences at 360 K testify also that the as-implanted samples examined with higher fluences (3.75 × 1016 and 5.0 × 1016 ions/cm2) have created a very thin conductive layer or conductive joints due to carbonization

The influence of low dose ion-irradiation on the mechanical properties of PMMA probed by nanoindentation

© Springer Science+Business Media Dordrecht 2015. The results of investigations of the influence of low dose B+-ion-irradiation (6.25×1014 ion/cm2) on the mechanical properties (hardness and elastic modulus) of polymethylmethacrylate (PMMA) using the nanoindentation tests with an ultra nano hardness tester are reported for the first time. It is established that the dependences of hardness and elastic modulus on the maximum indentation depth show major differences between pristine and ion-implanted samples in the range up to about 400 nm which is consistent with the maximum penetration depth of B+-ions into the PMMA matrix determined earlier by slow positron beam spectroscopy and SRIM simulation (stopping and range of ions in matter)

The influence of low dose ion-irradiation on the mechanical properties of PMMA probed by nanoindentation

© Springer Science+Business Media Dordrecht 2015. The results of investigations of the influence of low dose B+-ion-irradiation (6.25 ´ 1014 ion/cm2) on the mechanical properties (hardness and elastic modulus) of polymethylmethacrylate (PMMA) using the nanoindentation tests with an ultra nano hardness tester are reported for the first time. It is established that the dependences of hardness and elastic modulus on the maximum indentation depth show major differences between pristine and ion-implanted samples in the range up to about 400 nm which is consistent with the maximum penetration depth of B+-ions into the PMMA matrix determined earlier by slow positron beam spectroscopy and SRIM simulation (stopping and range of ions in matter)

Nanoindentation test of radiation-modified As<inf>2</inf>S<inf>3</inf> glass after ⁶⁰Co gamma-irradiation

© 2016, Editorial Department of Journal of the Chinese Ceramic Society. All right reserved.The results of the surface mechanical properties (i.e., hardness and elastic modulus) in the unmodified and radiation-modified As2S3 glass measured about 10 years after 60Co γ-irradiation, using a nanoindentation test with an ultra nano hardness tester (UNHT) were reported. It is indicated that the γ-irradiated g-As2S3 (g- for glassy) with the average energy of 60Co γ-quanta of 1.25 MeV and the accumulated dose of 2.41 MGy exhibits the increased surface hardness and elastic modulus values, compared to the unirradiated material, in the range of 200-1 600 nm indentation depth. In the long-term radiation-induced improvement of the surface mechanical properties in g-As2S3, the broader distribution of the experimental data was detected for the irradiated sample with radiation-induced oxidized layer, compared to the clean sample without the layer that was removed by washing and polishing

Nanoindentation test of radiation-modified As<inf>2</inf>S<inf>3</inf> glass after ⁶⁰Co gamma-irradiation

© 2016, Editorial Department of Journal of the Chinese Ceramic Society. All right reserved.The results of the surface mechanical properties (i.e., hardness and elastic modulus) in the unmodified and radiation-modified As2S3 glass measured about 10 years after 60Co γ-irradiation, using a nanoindentation test with an ultra nano hardness tester (UNHT) were reported. It is indicated that the γ-irradiated g-As2S3 (g- for glassy) with the average energy of 60Co γ-quanta of 1.25 MeV and the accumulated dose of 2.41 MGy exhibits the increased surface hardness and elastic modulus values, compared to the unirradiated material, in the range of 200-1 600 nm indentation depth. In the long-term radiation-induced improvement of the surface mechanical properties in g-As2S3, the broader distribution of the experimental data was detected for the irradiated sample with radiation-induced oxidized layer, compared to the clean sample without the layer that was removed by washing and polishing

Nanoindentation test of radiation-modified As<inf>2</inf>S<inf>3</inf> glass after ⁶⁰Co gamma-irradiation

© 2016, Editorial Department of Journal of the Chinese Ceramic Society. All right reserved.The results of the surface mechanical properties (i.e., hardness and elastic modulus) in the unmodified and radiation-modified As2S3 glass measured about 10 years after 60Co γ-irradiation, using a nanoindentation test with an ultra nano hardness tester (UNHT) were reported. It is indicated that the γ-irradiated g-As2S3 (g- for glassy) with the average energy of 60Co γ-quanta of 1.25 MeV and the accumulated dose of 2.41 MGy exhibits the increased surface hardness and elastic modulus values, compared to the unirradiated material, in the range of 200-1 600 nm indentation depth. In the long-term radiation-induced improvement of the surface mechanical properties in g-As2S3, the broader distribution of the experimental data was detected for the irradiated sample with radiation-induced oxidized layer, compared to the clean sample without the layer that was removed by washing and polishing

Biochemical evidence for multiple i-e ia molecules.

© Springer Science+Business Media Dordrecht 2015. The results of investigations of the influence of low dose B+-ion-irradiation (6.25×1014 ion/cm2) on the mechanical properties (hardness and elastic modulus) of polymethylmethacrylate (PMMA) using the nanoindentation tests with an ultra nano hardness tester are reported for the first time. It is established that the dependences of hardness and elastic modulus on the maximum indentation depth show major differences between pristine and ion-implanted samples in the range up to about 400 nm which is consistent with the maximum penetration depth of B+-ions into the PMMA matrix determined earlier by slow positron beam spectroscopy and SRIM simulation (stopping and range of ions in matter)

Carbonization in boron-ion-implanted polymethylmethacrylate as revealed from Raman spectroscopy and electrical measurements

© 2016 Taylor and Francis Group, LLC. The results of Raman spectroscopy and electrical measurements of 40 keV boron-ion-implanted polymethylmethacrylate with ion doses from 6.25 × 1014 to 5.0 × 1016 ions/cm2 are reported for the first time. The Raman spectra recorded in the 400-3800 cm-1 range, showing the formation of new carbon-carbon bands for the as-implanted samples at higher ion doses (>1016 ions/cm2), are found to be an additional support for carbonization processes earlier revealed by slow positrons. The current-voltage dependences at 360 K testify also that the as-implanted samples examined with higher fluences (3.75 × 1016 and 5.0 × 1016 ions/cm2) have created a very thin conductive layer or conductive joints due to carbonization

The influence of low dose ion-irradiation on the mechanical properties of PMMA probed by nanoindentation

© Springer Science+Business Media Dordrecht 2015. The results of investigations of the influence of low dose B+-ion-irradiation (6.25 ´ 1014 ion/cm2) on the mechanical properties (hardness and elastic modulus) of polymethylmethacrylate (PMMA) using the nanoindentation tests with an ultra nano hardness tester are reported for the first time. It is established that the dependences of hardness and elastic modulus on the maximum indentation depth show major differences between pristine and ion-implanted samples in the range up to about 400 nm which is consistent with the maximum penetration depth of B+-ions into the PMMA matrix determined earlier by slow positron beam spectroscopy and SRIM simulation (stopping and range of ions in matter)