Oleic Acid Surface Modification in the Preparation of Magnetic Nanoparticles by a Chemically Induced Transition

Meng, Xiangshen; He, Zhenghong; Ji, Zhao; Lin, Yueqiang; Liu, Xiaodong; Li, Decai; Li, Jian; Qiu, Xiaoyan

doi:10.1109/tmag.2017.2755600

Cited by 10 publications

(5 citation statements)

References 37 publications

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“…Heterogeneity in particle size and changes in density due to the oleic acid coating can influence fill times. Meng et al determine the effective density of the oleic acid-coated nanoparticles to be 2.92 g/cm 3 in a similar fabrication process to ours using particles of the same size as ours . An oleic acid molecule is about 1.97 nm in length.…”

Section: Resultssupporting

confidence: 50%

“…Meng et al determine the effective density of the oleic acid-coated nanoparticles to be 2.92 g/cm 3 in a similar fabrication process to ours using particles of the same size as ours. 48 An oleic acid molecule is about 1.97 nm in length. We adjusted for these changes in density and particle diameter with the introduction of an oleic acid layer; however, theoretical filling times calculated for OA-Fe 2 O 3 magnetic nanoparticles (MNPs) were nearly identical to filling times for bare Fe 2 O 3 MNPs.…”

Section: ■ Resultsmentioning

confidence: 99%

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Lithographically Defined Micropost Arrays for Programmable Actuation and Interfacial Hydrodynamics

Brooks

Cribb

Falvo

et al. 2021

ACS Appl. Polym. Mater.

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Magnetically actuating surface-attached post (ASAP) arrays have great potential in microfluidic flow control, including mixing and pumping. Both passive (nonactuating) and active (actuating) micropillar arrays can also be used to control pressure-driven flow and the motion of microscopic particles carried by the fluid through microfluidic channels. Molding techniques are popular for generating these microstructures. However, fabricating high aspect ratio elastomeric microstructures over large surface areas suffers from practical problems such as damage incurred in the demolding process. Here, we report on a fabrication protocol that generates ASAP with an aspect ratio as high as 23:1 and a cross-sectional area less than 1 μm 2 using straightforward photolithography processes. We generated 50 unique ASAP arrays, each occupying an area of 1 mm 2 on a silicon mold; these arrays have varied cross-sectional shape and size, aspect ratio, and spacings between neighboring posts. Our protocol also controls the level of magnetic material in the ASAP tips with a centrifugation step. Using a herringbone pattern ASAP array, we have demonstrated control over the relative phase of actuation between neighboring posts. Such ASAP serve as an experimental platform to test current models predicting that reciprocal actuators in close proximity can successfully drive flow in a low Reynolds (Re) number environment.

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Section: Resultssupporting

confidence: 50%

Section: ■ Resultsmentioning

confidence: 99%

Lithographically Defined Micropost Arrays for Programmable Actuation and Interfacial Hydrodynamics

Brooks

Cribb

Falvo

et al. 2021

ACS Appl. Polym. Mater.

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“…Therefore, oleic acid was utilized as a coupling agent for the surface modification of nanoparticles based on the following procedure to determine the onset point of asphaltene precipitation 51 , 52 . Additionally, heptane was selected as a solvent because it can efficiently dissolve both oleic acid and the nanoparticles, facilitating the mixing process and ensuring uniform distribution of the nanoparticles in the solution.…”

Section: Methodsmentioning

confidence: 99%

Mechanistic understanding of asphaltene precipitation and oil recovery enhancement using SiO2 and CaCO3 nano-inhibitors

Shadervan,

Jafari,

Teimouri

et al. 2024

Sci Rep

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Asphaltene precipitation in oil reservoirs, well equipment, and pipelines reduces production, causing pore blockage, wettability changes, and decreased efficiency. Asphaltenes, with their unique chemical structure, self-assemble via acid–base interactions and hydrogen bonding. Nano-inhibitors prevent asphaltene aggregation at the nanoscale under reservoir conditions. This study investigates the effect of two surface-modified nanoparticles, silica, and calcium carbonate, as asphaltene inhibitors and oil production agents. The impacts of these nano-inhibitors on asphaltene content, onset point, wettability, surface tension, and oil recovery factor were determined to understand their mechanism on asphaltene precipitation and oil production. Results demonstrate that these nano-inhibitors can significantly postpone the onset point of asphaltene precipitation, with varying performance. Calcium carbonate nano-inhibitor exhibits better efficiency at low concentrations, suspending asphaltene molecules in crude oil. In contrast, silica nano-inhibitor performs better at high concentrations. Wettability alteration and IFT reduction tests reveal that each nano-inhibitor performs optimally at specific concentrations. Silica nano-inhibitors exhibit better colloidal stability and improve oil recovery more than calcium carbonate nano-inhibitors, with maximum oil recovery factors of 33% at 0.1 wt.% for silica and 25% at 0.01 wt.% for calcium carbonate nano-inhibitors.

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“…The stability of MNPs is limited due to the hydrophobic coating. 28 In order to avoid this inconvenience, Chen et al 29 produced SPIONs with a copolymer and used this system for DOX delivery with improved stability. The copolymer of reducible polyamidoamine (rPAA) was self-assembled and synthesized with poly(ethylene glycol)(PEG)/dodecyl amine graft.…”

Section: Chemotherapeuticsmentioning

confidence: 99%

Superparamagnetic iron oxide nanoparticles (SPIONs) as a multifunctional tool in various cancer therapies

Musielak

Piotrowski

Suchorska

2019

Reports of Practical Oncology & Radiotherapy

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Over the past two decades nanotechnology has become an important part of novel medical research. Researchers have made great progress in developing nanotechnology applications used for detecting and treating oncological diseases. Recently, many research groups have focused on the use of superparamagnetic iron oxide nanoparticles (SPIONs) in cancer treatment. Due to the range of therapeutic properties and possibilities of various modifications, SPIONs are a promising and multifunctional tool in various cancer therapies and may help to overcome the limitations of conventional therapies. Moreover, it is still necessary to develop new methods of treatment with expected properties, such as lower toxicity, long-lasting effectiveness and higher selectivity. Analyzing the literature data, we found that currently SPIONs are used in the transport of drugs, immunotherapy and hyperthermia. The main aim of this review is to present various cancer treatment therapies utilizing SPIONs, the importance of the experiments carried out by research groups and further perspectives in the nanotechnological use of SPIONs.

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Oleic Acid Surface Modification in the Preparation of Magnetic Nanoparticles by a Chemically Induced Transition

Cited by 10 publications

References 37 publications

Lithographically Defined Micropost Arrays for Programmable Actuation and Interfacial Hydrodynamics

Lithographically Defined Micropost Arrays for Programmable Actuation and Interfacial Hydrodynamics

Mechanistic understanding of asphaltene precipitation and oil recovery enhancement using SiO2 and CaCO3 nano-inhibitors

Superparamagnetic iron oxide nanoparticles (SPIONs) as a multifunctional tool in various cancer therapies

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