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International Journal of Molecular... Aug 2021Efficient and safe nanopesticides play an important role in pest control due to enhancing target efficiency and reducing undesirable side effects, which has become a hot...
Efficient and safe nanopesticides play an important role in pest control due to enhancing target efficiency and reducing undesirable side effects, which has become a hot spot in pesticide formulation research. However, the preparation methods of nanopesticides are facing critical challenges including low productivity, uneven particle size and batch differences. Here, we successfully developed a novel, versatile and tunable strategy for preparing buprofezin nanoparticles with tunable size via anodic aluminum oxide (AAO) template-assisted method, which exhibited better reproducibility and homogeneity comparing with the traditional method. The storage stability of nanoparticles at different temperatures was evaluated, and the release properties were also determined to evaluate the performance of nanoparticles. Moreover, the present method is further demonstrated to be easily applicable for insoluble drugs and be extended for the study of the physicochemical properties of drug particles with different sizes.
Topics: Aluminum Oxide; Coated Materials, Biocompatible; Electrodes; Insecticides; Materials Testing; Metal Nanoparticles; Porosity; Surface Properties; Thiadiazines
PubMed: 34361113
DOI: 10.3390/ijms22158348 -
Nature Oct 2014
Topics: Aluminum Oxide; Biological Science Disciplines; Information Dissemination; Knowledge; Reproducibility of Results
PubMed: 25297397
DOI: 10.1038/514139b -
Environmental Science and Pollution... Jan 2016Bauxite residue (Red mud) is produced in alumina plants by the Bayer process in which Al-containing minerals are dissolved in hot NaOH. The global residue inventory... (Review)
Review
Bauxite residue (Red mud) is produced in alumina plants by the Bayer process in which Al-containing minerals are dissolved in hot NaOH. The global residue inventory reached an estimated 3.5 billion tons in 2014, increasing by approximately 120 million tons per annum. The appropriate management of bauxite residue is becoming a global environmental concern following increased awareness of the need for environmental protection. Establishment of a vegetation cover is the most promising way forward for the management of bauxite residue, although its physical and chemical properties can limit plant growth due to high alkalinity and salinity, low hydraulic conductivity, trace element toxicity (Al and Fe), and deficiencies in organic matter and nutrition concentrations. This paper discusses the various revegetation and rehabilitation strategies. Studies of the rehabilitation of bauxite residues have mainly focused on two approaches, amelioration of the surface layer and screening of tolerant plants and soil microorganisms. Amendment with gypsum can reduce the high alkalinity and salinity, promote soil aggregation, and increase the hydraulic conductivity of bauxite residues. Organic matter can provide a source of plant nutrients, form stable complexes with metal cations, promote hydraulic conductivity, stabilize soil structure, and provide an energy source for soil organisms. Tolerant plants and microorganisms such as halophytes and alkaliphilic microbes show the greatest potential to ameliorate bauxite residues. However, during restoration or as a result of natural vegetation establishment, soil formation becomes a critical issue and an improved understanding of the various pedogenic processes are required, and future direction should focus on this area.
Topics: Aluminum Oxide; Biodegradation, Environmental; Environmental Restoration and Remediation; Plant Development; Plants; Soil Pollutants
PubMed: 25911289
DOI: 10.1007/s11356-015-4558-8 -
Journal of Food Science Jun 2023The objective of this study was the effectiveness of using activated earth, activated alumina, and/or chitosan, either separately or in combination, as adsorbents to...
The objective of this study was the effectiveness of using activated earth, activated alumina, and/or chitosan, either separately or in combination, as adsorbents to remove free fatty acids (FFA) and peroxides from unpurified menhaden oil (MO). Thermal and rheological properties of MO were also evaluated. Five different combinations of absorbents were used to purify MO: Processes 1-3 involved purifications of MO by 5% chitosan (wt/wt of oil), 5% activated earth, and 5% activated alumina, respectively, process 4 involved MO purification with a combination of 6.5% chitosan, 3.5% activated earth, and 5% activated alumina, and process 5 involved MO purification process with a combination of adsorbents of 9% chitosan, 1% activated earth, and 5% activated alumina. All the adsorption processes were conducted at 25°C. Purified MO and MO were evaluated for their fatty acid profile, FFA, peroxide value (PV), moisture content (MC), minerals, and color. Triplicate experiments were conducted, and data were statistically analyzed using α = 0.05. Processes 4 and 5 were effective in reducing PV, FFA, and MC in MO. Thermal properties indicated processes 4 and 5 produced purer MO than processes 1-3. All the oil samples became less viscous, and the flow behavior index of MO was close to 1 after the adsorption processes. This study demonstrated that adsorption processes that include chitosan, activated earth, and activated alumina could effectively improve MO quality.
Topics: Adsorption; Aluminum Oxide; Chitosan; Fish Oils; Fatty Acids, Nonesterified; Peroxides
PubMed: 37122136
DOI: 10.1111/1750-3841.16563 -
Environmental Science and Pollution... Mar 2023In this work, a collaborative strategy for the aluminum and iron industry based on red mud recycling through the hydrometallurgy method was proposed. In this method, Fe...
In this work, a collaborative strategy for the aluminum and iron industry based on red mud recycling through the hydrometallurgy method was proposed. In this method, Fe and Al were firstly separated from the red mud by using HSO as a leaching agent, which was by-produced from the sintering process of an iron and steel industry. Multiple influence factors on the leaching process were investigated, with the HSO addition amount showing the strongest influence on the leaching rates of Al and Fe. The main components of the filter residue were CaSO, TiO, and SiO, which could be reused as additives in the building materials. Subsequently, the final Fe recovery product was obtained through the co-precipitation, Fe/Al separation, and Fe(OH) calcination. In the final product, the content of FeO reached 82.87%, and the iron grade was 58.01%, meeting the requirement being raw materials for sinter production.
Topics: Aluminum; Iron; Silicon Dioxide; Aluminum Oxide; Recycling
PubMed: 36656474
DOI: 10.1007/s11356-023-25389-8 -
Bioinspiration & Biomimetics Jun 2020The quest for new light-weight materials with superior mechanical properties is a goal of materials scientists and engineers worldwide. A promising route in this pursuit...
The quest for new light-weight materials with superior mechanical properties is a goal of materials scientists and engineers worldwide. A promising route in this pursuit is drawing inspiration from nature to design and develop materials with enhanced properties. By emulating the graded mineral content and hierarchical structure of fish scales of the Arapaima gigas from the nano to macro scales, we were able to develop bioinspired laminated composites with improved impact resistance. Activated by the addition of nano-particles of AlO and nano-layers of TiN to a thermoplastic fiber substrate, new energy dissipation mechanisms operating at the nanoscale enhanced the energy absorption and stiffness of the bioinspired material. Remarkably, the newly developed materials are easily transferred to the industry with minimum associated manufacturing costs.
Topics: Aluminum Oxide; Animal Scales; Animals; Biomimetic Materials; Fishes; Nanotechnology; Titanium
PubMed: 32348973
DOI: 10.1088/1748-3190/ab8e9a -
Journal of Biomedical Materials... Feb 2016The biological responses of aluminum oxide (Al2 O3 ) nanoparticles (NPs) and nanowires (NWs) in cultured fibroblasts (L929) and macrophages (RAW264) were evaluated from...
The biological responses of aluminum oxide (Al2 O3 ) nanoparticles (NPs) and nanowires (NWs) in cultured fibroblasts (L929) and macrophages (RAW264) were evaluated from their cytotoxicities and micromorphologic properties. Cultured cells were exposed to Al2 O3 NPs (13 nm diameter) and Al2 O3 NWs (2-6 × 200-400 nm). Cytotoxicity and genotoxicity were examined by immunostaining with fluorescence microscopy, and nanomaterial localization was studied by using scanning electron microscopy and transmission electron microscopy. The NPs were cytotoxic and genotoxic, whereas the NWs were not. The scanning electron microscopy images showed that the NPs aggregate more on the cell surface than do the NWs. The transmission electron microscopy images showed that the NPs were internalized into the vesicle and nuclei, for both cell types. In contrast, numerous solid NWs were observed as large aggregates in vesicles, but not in nuclei. Nuclear damage was confirmed by measuring cell viability and by immunostaining for NPs. The chemical changes induced by the NPs in the vesicles or cells may cause cell damage because of their large surface area per volume. The extent of NW entrapment was not sufficient to lower the viability of either cell type.
Topics: Aluminum Oxide; Animals; Cell Line; Cytotoxins; DNA Damage; Fibroblasts; Macrophages; Materials Testing; Mice; Nanoparticles; Nanowires
PubMed: 25715832
DOI: 10.1002/jbm.b.33377 -
Sensors (Basel, Switzerland) Nov 2023Optical sensors excel in performance but face efficacy challenges when submerged due to potential surface colonization, leading to signal deviation. This necessitates...
Optical sensors excel in performance but face efficacy challenges when submerged due to potential surface colonization, leading to signal deviation. This necessitates robust solutions for sustained accuracy. Protein and microorganism adsorption on solid surfaces is crucial in antibiofilm studies, contributing to conditioning film and biofilm formation. Most studies focus on surface characteristics (hydrophilicity, roughness, charge, and composition) individually for their adhesion impact. In this work, we tested four materials: silica, titanium dioxide, aluminum oxide, and parylene C. Bovine Serum Albumin (BSA) served as the biofouling conditioning model, assessed with X-ray photoelectron spectroscopy (XPS). Its effect on microorganism adhesion (modeled with functionalized microbeads) was quantified using a shear stress flow chamber. Surface features and adhesion properties were correlated via Principal Component Analysis (PCA). Protein adsorption is influenced by nanoscale roughness, hydrophilicity, and likely correlated with superficial electron distribution and bond nature. Conditioning films alter the surface interaction with microbeads, affecting hydrophilicity and local charge distribution. Silica shows a significant increase in microbead adhesion, while parylene C exhibits a moderate increase, and titanium dioxide shows reduced adhesion. Alumina demonstrates notable stability, with the conditioning film minimally impacting adhesion, which remains low.
Topics: Aluminum Oxide; Silicon Dioxide; Surface Properties; Serum Albumin, Bovine; Titanium; Adsorption
PubMed: 38067919
DOI: 10.3390/s23239546 -
Environmental Science and Pollution... Oct 2019In the present work, an experimental investigation was conducted to study the influence of adding aluminum oxide nanoparticles (AlO) with different average particle...
In the present work, an experimental investigation was conducted to study the influence of adding aluminum oxide nanoparticles (AlO) with different average particle sizes as additive to blends of diesel and waste plastic oil (WPO) on performance, emission, and combustion attributes of single-cylinder diesel engine operated at a constant speed. Two samples of AlO nanoparticle with average particle sizes of 20 and 100 nm were dispersed into a WPO20 blend containing 20% of WPO and 80% of diesel in the mass fractions of 10 and 20 ppm using ultrasonic stabilization. The experimental recordings revealed a decrease in engine performance and increase in all emission constituents while replacing diesel with WPO20. However, the addition of both 20- and 100-nm-sized AlO nanoparticles into WPO20 was found to enhance the brake thermal efficiency (BTHE) by 12.2 and 8.9% respectively and decrease the brake-specific fuel consumption (BSFC) by 11 and 8% respectively. The emission constituents such as carbon monoxide (CO), hydrocarbons (HC), nitric oxide (NO), and smoke opacity were minimized by the addition of both 20- and 100-nm-sized nanoparticles into WPO20 blend. However, the reduction of emissions was better for 20-nm-sized particles compared with that of 100-nm-sized particles. The combustion attributes such as cylinder pressure, heat release rate (HRR), and rate of pressure rise (RPR) were raised with shortened ignition delay (ID) by the addition of both sized nanoparticles. Overall, the inclusion of 20-nm-sized nanoparticles performs better catalytic activity to enhance the engine output characteristics along with minimum exhaust emissions.
Topics: Aluminum Oxide; Biofuels; Gasoline; Motor Vehicles; Nanoparticles; Particle Size; Plastics; Vehicle Emissions; Waste Products
PubMed: 31414387
DOI: 10.1007/s11356-019-06139-1 -
Particle and Fibre Toxicology May 2022Alumina nanoparticles (aluminaNPs), which are widely used in a range of daily and medical fields, have been shown to penetrate blood-brain barrier, and distribute and...
BACKGROUND
Alumina nanoparticles (aluminaNPs), which are widely used in a range of daily and medical fields, have been shown to penetrate blood-brain barrier, and distribute and accumulate in different brain areas. Although oral treatment of aluminaNPs induces hippocampus-dependent learning and memory impairments, characteristic effects and exact mechanisms have not been fully elucidated. Here, male adult rats received a single bilateral infusion of aluminaNPs (10 or 20 µg/kg of body weight) into the hippocampal region, and their behavioral performance and neural function were assessed.
RESULTS
The results indicated that the intra-hippocampus infusions at both doses of aluminaNPs did not cause spatial learning inability but memory deficit in the water maze task. This impairment was attributed to the effects of aluminaNP on memory consolidation phase through activation of proBDNF/RhoA pathway. Inhibition of the increased proBDNF by hippocampal infusions of p75 antagonist could effectively rescue the memory impairment. Incubation of aluminaNPs exaggerated GluN2B-dependent LTD induction with no effects on LTD expression in hippocampal slices. AluminaNP could also depress the amplitude of NMDA-GluN2B EPSCs. Meanwhile, increased reactive oxygen specie production was reduced by blocking proBDNF-p75 pathway in the hippocampal homogenates. Furthermore, the neuronal correlate of memory behavior was drastically weakened in the aluminaNP-infused groups. The dysfunction of synaptic and neuronal could be obviously mitigated by blocking proBDNF receptor p75, implying the involvement of proBDNF signaling in aluminaNP-impaired memory process.
CONCLUSIONS
Taken together, our findings provide the first evidence that the accumulation of aluminaNPs in the hippocampus exaggeratedly activates proBDNF signaling, which leads to neural and memory impairments.
Topics: Aluminum Oxide; Animals; Hippocampus; Male; Nanoparticles; Neurons; Rats; Spatial Memory
PubMed: 35538555
DOI: 10.1186/s12989-022-00477-8