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degradable material

Kyoungmin Min, Eunseog Cho
Intergranular cracking in the agglomerated form of secondary particles has been regarded as a major cause for mechanical degradation in layered oxide cathode materials for Li-ion batteries, but its detailed mechanistic origin linked to the mechanical properties of these materials is still unknown. In this study, a mesoscale simulation based on the description of the interaction between primary particles is established by combining the model of the shifted-force Lennard-Jones potential and granular Hertzian model to construct the microstructure of secondary particles of cathode materials...
October 18, 2018: Physical Chemistry Chemical Physics: PCCP
Jingjing Xu, Bingbing Feng, Ying Wang, Yadi Qi, Junfeng Niu, Mindong Chen
BiOCl/NaNbO3 p-n heterojunction photocatalysts with significantly improved photocatalytic performance were fabricated by a facile in-situ growth method. The obtained BiOCl/NaNbO3 samples were characterized by UV-vis absorption spectroscopy, scanning electron microscopy (SEM), X-ray diffraction (XRD), photocurrent (PC) and photoluminescence spectroscopy (PL). The photocatalytic activity of the BiOCl/NaNbO3 samples was investigated by the degradation of a typical antibiotic Ofloxacin (OFX). The experimental results showed that BiOCl/NaNbO3 composites exhibited much higher photocatalytic activity for OFX degradation compared to pure NaNbO3 and BiOCl...
2018: Frontiers in Chemistry
Hui Liu, Zhi-Guang Zhang, Hong-Wei He, Xiao-Xiong Wang, Jun Zhang, Qian-Qian Zhang, Yan-Fu Tong, Hong-Ling Liu, Seeram Ramakrishna, Shi-Ying Yan, Yun-Ze Long
To meet the urgent need of society for advanced photocatalytic materials, novel visible light driven heterostructured composite was constructed based on graphitic carbon nitride (g-C₃N₄) and fibrous TiO₂. The g-C₃N₄/TiO₂ (CNT) composite was prepared through electrospinning technology and followed calcination process. The state of the g-C₃N₄ and fibrous TiO₂ was tightly coupled. The photocatalytic performance was measured by degrading the Rhodamine B. Compared to commercial TiO₂ (P25® ) and electrospun TiO₂ nanofibers, the photocatalytic performance of CNT composite was higher than them...
October 16, 2018: Nanomaterials
Kuruma Malkappa, Jayita Bandyopadhyay, Suprakas Sinha Ray
Polylactide (PLA) is one of the most widely used organic bio-degradable polymers. However, it has poor flame retardancy characteristics. To address this disadvantage, we performed melt-blending of PLA with intumescent flame retardants (IFRs; melamine phosphate and pentaerythritol) in the presence of organically modified montmorillonite (OMMT), which resulted in nanobiocomposites with excellent intumescent char formation and improved flame retardant characteristics. Triphenyl benzyl phosphonium (OMMT-1)- and tributyl hexadecyl phosphonium (OMMT-2)-modified MMTs were used in this study...
October 16, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Wei Chu, Pengqian Tian, Ning Ding, Qing Cai, Jinlong Li, Xuezhi Zhuo, Zhaohui Tang, Jingxin Gou, Tian Yin, Yu Zhang, Haibing He, Xing Tang
PURPOSE: Despite being widely used for the treatment of several solid tumors, Gemcitabine (GEM) exhibits several suboptimal pharmacokinetic properties. Therefore, the design of nanoparticle delivery systems is a promising strategy to enhance GEM pharmacokinetic properties. METHODS: In this work, the polymeric material methoxy poly(ethylene glycol)-block-poly(L-glutamic acid)-graft-gemcitabine (mPEG-b-PLG-g-GEM) was synthesized through the covalent conjugation of GEM with the carboxylic group of methoxy poly(ethylene glycol)-block-poly (L-glutamic acid) (mPEG-b-PLG) (mPEG113 , Mn = 5000)...
October 11, 2018: Pharmaceutical Research
E Bartfai, K Nemeth, B El Mrabate, M Udayakumar, K Hernadi, Z Nemeth
Here we report the application of zinc oxide (ZnO) coated multi-walled carbon nanotube (MWCNT) composites in the photocatalytic decomposition of acetaldehyde (AA). Zinc oxide nanoparticles were successfully coated on the multi-walled carbon nanotube via impregnation process using zinc acetate (Zn(CH₃COO)₂×2H₂O) as precursor and sodium dodecyl sulfate (SDS) treated multiwalled carbon nanotube as raw material under different solvent conditions. The applied solvents during preparation were ethanol (EtOH) and water (H₂O)...
January 1, 2019: Journal of Nanoscience and Nanotechnology
Zsejke-Réka Tóth, Zsolt Pap, Virginia Danciu, Veronica Cosoveanu, Lucian Baia, Gábor Kovács
Photocatalytic applicability of different TiO₂-based nanomaterials is a current hot topic. Therefore, our interest for the present research was to elucidate the formation of primary and secondary intermediates during the phenol degradation by photocatalysis, in the presence of Au/TiO₂ nanocomposites. The composites consisted of differently shaped gold nanoparticles and commercial titania (Evonik Aeroxide P25). The obtained composites and the noble metal nanoparticles' morphology was investigated by Transmission Electron Microscopy (TEM), their optical properties were explored using Diffuse Reflectance Spectroscopy (DRS), while the crystal structure was characterized by X-ray diffraction (XRD)...
January 1, 2019: Journal of Nanoscience and Nanotechnology
Endre-Zsolt Kedves, István Székely, Lucian Baia, Monica Baia, Alexandra Csavdári, Zsolt Pap
Kinetic and mechanistic related approaches for mostly titania were intensively studied in the literature. However, combined modelling and kinetic studies are few. Therefore, the present work focuses on modelling the dependence of the degradation kinetics of two model compounds (salicylic acid-SA and methyl orange-MO) on Evonik Aeroxide P25, hydrothermally prepared hierarchical TiO₂ and P25/WO₃ nanostars, obtained also by hydrothermal crystallization. The obtained individual semiconductors and the composites were characterized using XRD, DRS, SEM, while the photocatalytic degradation of the model pollutants were carried out varying the catalyst load, the initial pollutant concentration and incident light intensity...
January 1, 2019: Journal of Nanoscience and Nanotechnology
Seema Garg, Mohit Yadav, Amrish Chandra, Klara Hernadi
In the recent past, bismuth oxyhalides (BiOX) have been widely used for the photocatalytic degradation of the organic pollutants and other environmental remediation because of their higher stability, economic viability, nontoxicity and effective charge separation. We begin with the review of the different approaches adopted so far for BiOX (X = Cl, Br, and I) synthesis and a study of their photocatalytic performances under UV and visible light towards the various organic as well as inorganic pollutants. Later on, a study on further enhancement of the efficiency of BiOX under UV and visible light irradiation using recent advancements would be presented...
January 1, 2019: Journal of Nanoscience and Nanotechnology
Peng Ye, Qiancheng Zou, Luyang An, Yi Wei, Aihua Xu, Xiaoxia Li
Due to low cost and low toxicity, manganese oxides have been extensively explored to reduce organic pollutants in wastewater via peroxymonosulfate (PMS) activation; but the development of manganese-based catalysts with facile synthesis process at low temperatures and high efficiency is still of significant practical interest. In this paper, a simple room temperature method has been successfully developed to synthesize cryptomelane-type manganese octahedral molecular sieves (OMS-2) from KMnO4 and MnSO4 in the presence of carbon nanotubes (CNTs)...
October 10, 2018: Journal of Colloid and Interface Science
Ibrahima Diouf, Oumar Dia, Moussa Bagha Diedhiou, Patrick Drogui, Alpha Ousmane Toure, Sidy Mambaye Lo, Michel Rumeau, Codou Gueye Mar/Diop
In this work, the study of hydrogen peroxide (H2 O2 ) electro-generation using graphite from exhausted batteries (Gr-Bat) was conducted. Linear sweep voltammetry and electrolysis experiments were carried out in a single compartment electrochemical cell. Study of the possibility to use this electrode revealed that it presents, as vitreous carbon (VC) electrode, a reduction of oxygen with two successive waves (bi-electronic reduction). The first wave corresponds to the reduction of O2 to H2 O2 , while the second one corresponds to the reduction of H2 O2 to H2 O...
October 16, 2018: Environmental Technology
Noelle L Anglin, Ahmed Amri, Zakaria Kehel, Dave Ellis
Genebanks are responsible for collecting, maintaining, characterizing, documenting, and distributing plant genetic resources for research, education, and breeding purposes. The rationale for requests of plant materials varies highly from areas of anthropology, social science, small-holder farmers, the commercial sector, rehabilitation of degraded systems, all the way to crop improvement and basic research. Matching "the right" accessions to a particular request is not always a straightforward process especially when genetic resource collections are large and the user does not already know which accession or even which species they want to study...
October 2018: Biopreservation and Biobanking
Malgorzata Szumacher-Strabel, Anna Stochmal, Adam Cieslak, Martyna Kozłowska, Dawid Kuznicki, Mariusz Kowalczyk, Wieslaw Oleszek
BACKGROUND: Alfalfa (Medicago sativa) is an important legume used in animal feed. The primary objective in this study was to analyze and trace the individual saponins in fresh and ensiled alfalfa of ten varieties, with the aim of evaluating the structural changes undergone by saponins during ensiling. A secondary objective was to examine whether any of the changes in saponin content were associated with changes in the basic nutrient composition of the ensiled alfalfa. RESULTS: The total saponin concentration increased when the fresh alfalfa was processed into silage...
October 16, 2018: Journal of the Science of Food and Agriculture
Anand H Segar, Jeremy C T Fairbank, Jill Urban
PURPOSE: The aim of this study was to identify the effects of leptin upon the intervertebral disc (IVD) and to determine whether these responses are potentiated within an environment of existing degeneration. Obesity is a significant risk factor for low back pain (LBP) and IVD degeneration. Adipokines, such as leptin, are novel cytokines produced primarily by adipose tissue and have been implicated in degradative and inflammatory processes. Obese individuals are known to have higher concentrations of serum leptin, and IVD cells express leptin receptors...
October 15, 2018: European Spine Journal
Warren de Bruyn, Daniel Chang, Tiffany Bui, Sovanndara Hok, Catherine Clark
Fluorescence 3D excitation emission matrix (EEM) spectra of oil products in artificial seawater were monitored as a function of irradiation time in a solar simulator. EEMs were obtained for an excitation range of 240-400 nm and an emission range of 248-830 nm; this is the wavelength range typically used in chromophoric dissolved organic matter (CDOM) EEM studies in natural waters. This allows for comparison to prior work on CDOM in an oil-contaminated salt marsh that attributed a fluorescent component in the tryptophan/tyrosine protein-region to oil...
October 15, 2018: Environmental Science and Pollution Research International
Changshun Chen, Chen Zhu, Xiang Hu, Qiuli Yu, Qianjin Zheng, Shengxiang Tao, Lihong Fan
Purpose: The aims of this research were to combine α-hemihydrate calcium sulfate/octacalcium phosphate (α-CSH/OCP) with sodium hyaluronate (SH) or SH sulfate (SHS) to determine whether these composites can be used as a new type of bone repair material. This study may provide a theoretical basis and new ideas for the construction of active bone repair materials and their clinical application. Methods: In this study, we combined α-CSH/OCP with SH or SHS. Scanning electron microscopy (SEM), Fourier-transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), thermogravimetric analysis (TGA), and the wettability test were performed, and porosity, setting time, in vitro degradation, and the mechanical properties of these composite materials were analyzed to evaluate the ultrastructural and physicochemical properties...
2018: Drug Design, Development and Therapy
Nadin Rohland, Isabelle Glocke, Ayinuer Aximu-Petri, Matthias Meyer
DNA preserved in ancient bones, teeth and sediments is typically highly fragmented and present only in minute amounts. Here, we provide a highly versatile silica-based DNA extraction protocol that enables the retrieval of short (≥35 bp) or even ultrashort (≥25 bp) DNA fragments from such material with minimal carryover of substances that inhibit library preparation for high-throughput sequencing. DNA extraction can be performed with either silica spin columns, which offer the most convenient choice for manual DNA extraction, or silica-coated magnetic particles...
October 15, 2018: Nature Protocols
Yuejiao Xie, Qing Hu, Guodong Feng, Xu Jiang, Jinlong Hu, Mingxiong He, Guoquan Hu, Shumiao Zhao, Yunxiang Liang, Zhiyong Ruan, Nan Peng
Phenolic inhibitors generated during alkaline pretreatment of lignocellulosic biomasses significantly hinder bacterial growth and subsequent biofuel and biochemical production. Water rinsing is an efficient method for removing these compounds. Nevertheless, this method often generates a great amount of wastewater, and leads to the loss of solid fiber particles and fermentable sugars. Kurthia huakuii LAM0618T , a recently identified microorganism, was herein shown to be able to efficiently transform phenolic compounds (syringaldehyde, hydroxybenzaldehyde, and vanillin) into less toxic acids...
October 12, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Weibin Li, Shicheng Hu, Mingxi Deng
It is known that measurement and extraction of the tiny amplitude of second harmonic Lamb waves are the main difficulties for practical applications of the nonlinear Lamb wave technique. In this study, phase-reversal approaches and phase matching technique are combined to build up the second-harmonic generation (SHG) of Lamb waves. A specific Lamb wave mode pair, which satisfied phase matching conditions, is selected to ensure the generation of cumulative second harmonic waves. Lamb wave signals with the same frequency but in reverse phase, propagating in the given specimen, are added together to counteract the fundamental waves, and simultaneously to enhance the signals of the second harmonic generated...
October 12, 2018: Materials
Yuxiang Jing, Yunping Xi
Neutron radiation can deteriorate mechanical properties of the concrete materials, and thus it is questionable that neutron transport properties of concrete can remain unchanged during the life span of biological shielding walls. one-speed neutron diffusion equation and heat conduction equation were used as governing equations for prediction of neutron radiation and thermal field in concrete, respectively. The potential variations of transport properties due to neutron radiation and elevated temperature were estimated...
October 1, 2018: Journal of Hazardous Materials
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