Dimensional analysis of aqueous magnetic fluids

Racuciu, M.; Creangă, Dorina; Suliţanu, N.; Badescu, V.

doi:10.1007/s00339-007-4139-x

Cited by 19 publications

(21 citation statements)

References 13 publications

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“…These suspensions exhibit a fast and very strong response to external magnetic fields. The application of even a modest external magnetic field results in a strong magnetic interaction leading to aggregation in complex networks [120,121]. Magnetic nanoparticles are found to have zero remanence [122].…”

Section: Manipulation Of Colloid Stability With External Stimulimentioning

confidence: 99%

Functionalized gold nanoparticles: Synthesis, structure and colloid stability

Zhou

Ralston

Sedev

et al. 2009

Journal of Colloid and Interface Science

371

223

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Section: Manipulation Of Colloid Stability With External Stimulimentioning

confidence: 99%

Functionalized gold nanoparticles: Synthesis, structure and colloid stability

Zhou

Ralston

Sedev

et al. 2009

Journal of Colloid and Interface Science

371

223

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“…Even though water based ferrofluid addition in culture medium represents a source of iron, it could be supposed that ferrophase nanoparticles may have also a magnetic influence on the enzymatic structures implied in the different stages of the photosynthesis reactions. Treatment of Zea mays plantlets with an aqueous dispersion of water based magnetic fluid constituted by coating the small magnetic nanoparticles with perchloric acid resulted in slight inhibition of plant growth and on the leaf surface of plants treated with an enhanced volume fraction of aqueous magnetic fluid solution brown spots occurred [81]. It could be supposed that the iron oxides provided by the magnetite from magnetic fluid ferrophase could interfere with the complex redox reactions involved in the photosynthesis phenomenon.…”

Section: Positive Effects Of Mnps On Plantsmentioning

confidence: 99%

“…Nano-iron oxide was also found to facilitate the photosynthate and iron transferring to the leaves of peanut [79]. Analysis of the influence of magnetic nanoparticles coated with tetramethylammonium hydroxide on the growth of Zea mays plant in early ontogenetic stages showed that application of small ferrofluid concentrations (10-50 mm ) led to marked drop in chlorophyll a level and the ratio chlorophyll a/chlorophyll b (about 35% decreasing in both cases) [80]. Even though water based ferrofluid addition in culture medium represents a source of iron, it could be supposed that ferrophase nanoparticles may have also a magnetic influence on the enzymatic structures implied in the different stages of the photosynthesis reactions.…”

Section: Positive Effects Of Mnps On Plantsmentioning

confidence: 99%

Metal Nanoparticles and Plants / Nanocząstki Metaliczne I Rośliny

Masarovičová¹,

Kráľová²

2013

Ecological Chemistry and Engineering S

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Metal nanoparticles (MNPs) belong mostly to the engineered type of nanoparticles and have not only unique physical and chemical properties but also different biological actions. In recent years, noble MNPs and their nano-sized agglomerates (collectively referred to as nanoparticles or particles in the subsequent sections) have been the subjects of much focused research due to their unique electronic, optical, mechanical, magnetic and chemical properties that can be significantly different from those of bulk materials. To enhance their use, it is important to understand the generation, transport, deposition, and interaction of such particles. Synthesis of MNPs is based on chemical or physical synthetic procedures and by use of biological material ("green synthesis" as an environmentally benign process) including bacteria, algae and vascular plants (mainly metallophytes). In biological methods for preparation of metal nanoparticles mainly leaf reductants occurring in leaf extracts are used. MNPs can be formed also directly in living plants by reduction of the metal ions absorbed as a soluble salt, indicating that plants are a suitable vehicle for production of MNPs. These methods used for preparation of MNPs are aimed to control their size and shape. Moreover, physicochemical properties of MNPs determine their interaction with living organisms. In general, inside the cells nanoparticles might directly provoke either alterations of membranes and other cell structures or activity of protective mechanisms. Indirect effects of MNPs depend on their physical and chemical properties and may include physical restraints, solubilization of toxic nanoparticle compounds or production of reactive oxygen species. Toxic impacts of MNPs on plants is connected with chemical toxicity based on their chemical composition (eg release of toxic metal ions) and with stress or stimuli caused by the surface, size and shape of these nanoparticles. Positive effects of MNPs were observed on the following plant features: seed germination, growth of plant seedlings, stimulation of oxygen evolution rate in chloroplasts, protection of chloroplasts from aging for long-time illumination, increase of the electron transfer and photophosphorylation, biomass accumulation, activity of Rubisco, increase of quantum yield of photosystem II, root elongation, increase of chlorophyll as well as nucleic acid level and increase in the shoot/root ratio. However, it should be stressed that MNPs impact on human and environmental health remains still unclear.

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“…Fe 3 O 4 NPs were also found to facilitate the photosynthate and iron transfer to the leaves of peanut [264]. Application of ferrofluid concentrations (0.01-0.05 cm 3 /dm 3 ) containing magnetic NPs coated with tetramethylammonium hydroxide on Z. mays plants in early ontogenetic stages induced plant length stimulation, the increase of chlorophyll a (up to 13%) as well as the nucleic acid level (up to 10%) in maize plantlets during their first days of life [265]. According to Gonzalez-Melendi et al [266], the biocompatible magnetic fluids can be uptaken into whole living plants and further can move inside using the vascular system being concentrated in specific areas by application of magnetic gradients.…”

Section: Nanofertilizers and Plant Growth Stimulating Nanoparticlesmentioning

confidence: 99%

Application Of Nanotechnology In Agriculture And Food Industry, Its Prospects And Risks

Jampílek

Kráľová

2015

Ecological Chemistry and Engineering S

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Nanoagrochemicals, such as nanopesticides, nanofertilizers or plant growth stimulating nanosystems, were primarily designed to increase solubility, enhance bioavailability, targeted delivery, controlled release and/or protection against degradation resulting in the reduced amount of applied active ingredients and finally in a decrease of dose-dependent toxicity/burden. This paper is a comprehensive up-to-date review related to the preparation and the biological activity of nanoformulations enabling gradual release of active ingredient into weeds and the body of pests and controlled release of nutrients to plants. The attention is also devoted to the decrease of direct environmental burden and economic benefits due to application of nanoformulations, where less amount of active ingredient is needed to achieve the same biological effect in comparison with bulk. The application of nanotechnology in the areas such as food packaging, food security, encapsulation of nutrients and development of new functional products is analysed. The use of nanoparticles in biosensors for detection of pathogens and contaminants as well as in DNA and gene delivery is discussed as well. Benefits and health risks of nanoagrochemicals are highlighted, and special attention is given to nanoecotoxicology and guidelines and regulatory documents related to the use of nanoformulations in agriculture and food industry.

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Dimensional analysis of aqueous magnetic fluids

Cited by 19 publications

References 13 publications

Functionalized gold nanoparticles: Synthesis, structure and colloid stability

Functionalized gold nanoparticles: Synthesis, structure and colloid stability

Metal Nanoparticles and Plants / Nanocząstki Metaliczne I Rośliny

Application Of Nanotechnology In Agriculture And Food Industry, Its Prospects And Risks

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