We present laboratory studies on radiation chemistry, sputtering, and amorphization of crystalline H(2)O(2) induced by 20 keV protons at 80 K. We used infrared spectroscopy to identify H(2)O, O(3), and possibly HO(3), measure the fluence dependence of the fraction of crystalline and amorphous H(2)O(2) and of the production of H(2)O and destruction of H(2)O(2). Furthermore, using complementary techniques, we observe that the sputtering yield depends on fluence due to the buildup of O(2) radiation products in the sample. In addition, we find that the effective cross sections for the destruction of hydrogen peroxide and the production of water are very high compared to radiation chemical processes in water even though the fluence dependence of amorphization is nearly the same for the two materials. This result is consistent with a model of fast cooling of a liquid track produced by each projectile ion rather than with the disorder produced by the formation of radiolytic products.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1063/1.3079612 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
3D Covalent Organic Framework Membrane with Interactive Ion Nanochannels for Hydroxide Conduction.
J Am Chem Soc
January 2025
Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China.
Crystalline porous materials, known for their ordered structures, hold promise for efficient hydroxide conductivity in alkaline fuel cells with limited ionic densities. However, the rigid cross-linking of porous materials precludes their processing into membranes, while composite membranes diminish materials' conductivity advantage due to the interrupted phases. Here, we report a self-standing three-dimensional covalent organic framework (3D COF) membrane with efficient OH-transport through its interconnected 3D ionic nanochannels.
View Article and Find Full Text PDFLigand engineering boosts catalase-like activity of gold nanoclusters for cascade reactions combined with glucose oxidase in ZIF-8 matrix.
Anal Chim Acta
February 2025
Tianjian Laboratory of Advanced Biomedical Sciences, Institute of Advanced Biomedical Sciences, Henan International Joint Laboratory of Tumor Theranostic Cluster Materials, Henan Key Laboratory of Crystalline Molecular Functional Materials, College of Chemistry, Zhengzhou University, 450001, Zhengzhou, China. Electronic address:
Background: Integrating natural enzymes and nanomaterials exhibiting tailored enzyme-like activities is an effective strategy for the application of cascade reactions. It is essential to develop a highly efficient and robust glucose oxidase-catalase (GOx-CAT) cascade system featuring controllable enzyme activity, a reliable supply of oxygen, and improved stability for glucose depletion in cancer starvation therapy. However, the ambiguous relationship between structure and performance, and the difficulty in controlling enzyme-mimic activity, significantly hinder their broader application.
View Article and Find Full Text PDFGreen fabricated bimetallic zinc ferrite nanoparticles mitigate oxidative stress-induced pathogenesis.
Anal Biochem
January 2025
Department of Studies and Research in Biochemistry, Tumkur University, Tumkur 572103, Karnataka, India. Electronic address:
Current study evaluates the beneficial role of bio-functionalized zinc ferrite nanoparticles fabricated from an aqueous extract of Decalepis hamiltonii leaves (DHLE.ZnFeO NPs) on sodium nitrite (NaNO) and Diclofenac (DFC) induced oxidative stress in RBCs and Sprague Dawley male rat models. DHLE.
View Article and Find Full Text PDFPorphyrin-based Vinylene-linked 3D Covalent Organic Framework with Unprecedented cya Topology for Photocatalytic H2O2 Production.
Angew Chem Int Ed Engl
January 2025
University of Science and Technology Beijing, School of Chemistry and Biological Engineering, CHINA.
Designing and realizing new topologies represent one of the most important ways toward developing new structures and functionalities for molecule-based frameworks including SOFs, MOFs, and COFs. Herein, Aldol condensation between 5,10,15,20-tetrayl(tetrakis(([1,1':3',1''-terphenyl]-4,4''-dicarbaldehyde)))-porphyrin (TTEP) and 2,4,6-trimethyl-1,3,5-triazine (TMT) affords the vinylene-linked 3D covalent organic framework Por-COF-cya. Powder X-ray diffraction (PXRD) in combination with structural simulation reveals its high crystalline structure with an unprecedented cya topology in the molecule-based frameworks reported thus far.
View Article and Find Full Text PDFPorous Supramolecular Crystalline Materials for Photocatalysis.
Angew Chem Int Ed Engl
January 2025
Tianjin University of Technology, Institute for New Energy Materials and Low Carbon Technologies, 300384, Tianjin, CHINA.
Porous supramolecular crystalline materials (PSCMs), usually including hydrogen-bonded organic frameworks (HOFs), π frameworks, and so on, can be defined as a type of porous supramolecular assemblies stabilized by hydrogen-bonding, π-π stacking and other non-covalent interactions. Given the unique features of mild synthetic conditions, well-defined and tailorable structures, easy healing and regeneration, PSCMs have captured widespread interest in molecular recognition, sensor, gas storage and separation, and so on. Moreover, they currently emerge as promising photocatalysts because it is readily to endow PSCMs with photo-function, and the hydrogen-bonding and π-π stacking can serve as electron transfer channels to boost photocatalytic activity.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!