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Sol Gel Method for the synthesis of ZnO nanoparticlesPlease join for free to our telegram group for discussion in all areas of nanotechnology: https://t.me/j...
The coated ZnO nanoparticles enhanced the durability of stone surface to resist the fungal attack when subjected to inoculums containing Aspergillus niger and Penicillium sp. and improved the resistance to UV aging, relative humidity, and thermal effect compared to the samples coated with the acrylic polymer without ZnO nanoparticles.
Nanoparticles can be classified into different types according to the size, morphology, physical and chemical properties. Some of them are carbon-based nanoparticles, ceramic nanoparticles, metal nanoparticles, semiconductor nanoparticles, polymeric nanoparticles and lipid-based nanoparticles. Nanoparticles types are commonly divided in two ...
The protection of the stone materials represents an ongoing challenge in the field of conservation of cultural heritage. Protective coatings are used to make the stone more resistant against pollutants, biological growths, and especially against the action of water. In last decades, nanoparticles were synthetized and tested to improve the performance of such coatings.
Nanotechnology, the manipulation of matter at the atomic and molecular scale to create materials with remarkably varied and new properties, is a rapidly expanding area of research with...
3.8 Toxicology of Nanoparticles. Studies specifically dealing with the toxicity of nanoparticles have only appeared recently and, although now emerging in the literature, are still rare. Data concerning the behaviour and toxicity of particles mainly comes from studies on inhaled nanoparticles (reviewed by Oberdörster G 1996, Oberdörster G et al 2005, Donaldson and Stone 2003, Borm 2002 ...
The biocidal effectiveness of the nanoparticles was studied on stone surfaces by multispectral imaging, digital image analysis and optical coherence tomography. This is a low-cost and efficient ...
Nanoparticles (NPs) of metal oxides, sometimes referred to as engineered nanoparticles have been used to protect building surfaces against biofilm formation for many years, but their history in the Cultural Heritage world is rather short. Their first reported use was in 2010. Thereafter, a wealth of reports can be found in the literature, with Ti, Ag and Zn oxides being the major protagonists.
The LPS plus nanoparticle groups received LPS (2.5 mg/kg) combined with nanoparticles (4 mg/kg) in vehicle. The surface areas of 14-nm nanoparticles and 56-nm nanoparticles are 300 m 2 /g and 45 m 2 /g, respectively (disclosed by Degussa). Nanoparticles were autoclaved at 250°C for 2 hr before use.
Modified novel dental plaster reinforced by 10 wt.% aluminum oxide nanoparticle fillers could be used alternatively to the conventional improved stone (type IV) to be utilized as final cast and die materials with the highest surface microhardness and compressive strength and lowest setting expansion than that of the improved stone.
When the nanoparticle encounters a cancer cell it adheres to it and releases the drug into the cancer cell. This directed method of drug delivery has great potential for treating cancer patients while producing less side harmful affects than those produced by conventional chemotherapy. ... MEMS is a stepping stone to NEMS or Nano ...
Disclosed herein is a method of coating nanoparticles with a metal oxide. The method includes substituting surfaces of hydrophobic nanoparticles with an organic substance having a hydrophilic group effective to render the nanoparticles hydrophilic; and injecting the hydrophilic nanoparticles and a precursor of the metal oxide into an organic solvent including an amphiphilic surfactant to coat ...
Silver nanoparticles are nanoparticles of silver of between 1 nm and 100 nm in size. While frequently described as being 'silver' some are composed of a large percentage of silver oxide due to their large ratio of surface to bulk silver atoms. Numerous shapes of nanoparticles can be constructed depending on the application at hand.
Iron nanoparticles were produced using the extract of mortiño berry ( Vaccinium floribundum ) (vZVI) as reducing and stabilizer agent. Fresh nanoparticles were characterized using TEM, XRD, and FTIR techniques, while laboratory experiments were conducted to assess the removal of total petroleum hydrocarbons (TPHs) from water and soil after treatment with synthesized nanoscale iron particles.
The aim of this study is to evaluate the effectiveness of CaCO3 nanoparticles as a consolidation and protection material for calcareous stone …
Self-cleaning and de-polluting stone surfaces: TiO 2 nanoparticles for limestone
Engineered nanoparticles (NPs) have been widely demonstrated to induce toxic effects to various cell types. In vitro cell exposure systems have high potential for reliable, high throughput screening of nanoparticle toxicity, allowing focusing on particular pathways while excluding unwanted effects due to other cells or tissue dosimetry. The work presented here involves a detailed ...
Green silver nanoparticles of Phyllanthus amarus: as an antibacterial agent against multi drug resistant clinical isolates of Pseudomonas aeruginosa. J Nanobiotechnology. 2014;12(1):40. 64. Ahmad A, Wei Y, Syed F, et al. The effects of bacteria-nanoparticles interface on the antibacterial activity of green synthesized silver nanoparticles.
Download Citation | On May 1, 2010, Peter Maitlis published Stones to nanoparticles . . . and beyond | Find, read and cite all the research you need on ResearchGate
Layered double hydroxide nanoparticles (LDH NPs) with a unique layered structure, sheet-like morphology, anion exchange, and pH-sensitive properties are considered promising platforms for biomedical applications such as cancer diagnosis and treatment. ... These fascinating features motivate us to use the "one stone for two birds" strategy ...
Once dispersed in 2-propanol, the nanoparticles have been used to consolidate real substrates (stone, adobe and stucco) confirming their high performance in terms of surface consolidation and - when mixed with certain surfactants - water absorption.
Nanoparticles, which have been observed in geological samples, have also been isolated from biological specimens, including kidney stones. These nanoparticles have certain properties that are consistent with a novel life form, including in vitro self-replication, and contain lipids, DNA and proteins.
The development of highly innovative techniques and technologies to enhance performance and technical sustainability of materials used in the field of cultural heritage conservation is providing conservators with innovative nanocomposites materials, including protective coatings, by merging the performances of engineered nanoparticles (NPs) with conventional chemicals.
Wettability alteration was proposed as one of the enhanced oil recovery (EOR) mechanisms for nanoparticle fluid (nanofluid) flooding. The effect of nanoparticle adsorption on wettability alteration was investigated by wettability index measurement of Berea sandstone core injected with nanofluids and by contact angle measurement of a glass surface treated with nanofluids.
The stone powder and the silica nanoparticles were weighed using a precision digital scale (EC-301 SL; GAMA), and distilled water was measured using a 10 mL glass pipette (Satelit) as recommended by the stones' manufacturers and according to the test groups for the silica nanoparticles. The stones were mechanically spatulated under a vacuum ...
Alcohol dispersions of Ca(OH)2 nanoparticles, the so-called nanolimes, are emerging as an effective conservation material for the consolidation of stone, mortars, and plasters present in old masonry and/or mural paintings. To better understand how this treatment operates, to optimize its performance …
Coating of different lithotypes. Nanoparticles are increasingly exploited in many research fields, one which is the conservation of deteriorated stones.
Iron Oxide Nanoparticles. Iron (III) oxide (Fe 2 O 3) is a reddish brown, inorganic compound which is paramagnetic in nature and also one of the three main oxides of iron, while other two being FeO and Fe 3 O 4.The Fe 3 O 4, which also occurs naturally as the mineral magnetite, is also superparamagnetic in nature.Due to their ultrafine size, magnetic properties, and biocompatibility ...
Marble and limestone have been extensively used as building materials in historical monuments. Environmental, physical, chemical and biological factors contribute to stone deterioration. The rehabilitation of stone damage and the delay of further deterioration is of utmost importance. Inorganic nanoparticles having chemical and crystallographic affinity with building materials is very ...
Alcohol dispersions of Ca(OH)2 nanoparticles, the so-called nanolimes, are emerging as an effective conservation material for the consolidation of stone, mortars, and plasters present in old masonry and/or mural paintings. To better understand how this treatment operates, to optimize its performance …
Selective hydrogenation of CO2 to methanol is a "two birds, one stone" technology to mitigate the greenhouse effect and solve the energy demand–supply deficit. Cu-based catalysts can effectively catalyze this reaction but suffer from low catalytic stability caused by the sintering of Cu species. Here, we report a series of zeolite-fixed catalysts Cu/ZnOx(Y)@Na-ZSM-5 (Y is the mass ratios ...
As researches have shown, nanoparticles have a major role in the case of polymer molecules adsorption on stones. In a classification, one can attribute this dependence to the following: (a) Polymer viscosity, (b) Nanoparticles' concentration, (c) Stone characteristics, (d) Reaction temperature, (e) Durability against stone and solution salinity.
The aim of this study is to evaluate the effectiveness of CaCO3 nanoparticles as a consolidation and protection material for calcareous stone monuments, when those nanoparticles used are dispersed ...
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