Controlled synthesis of SPION@SiO<sub>2</sub> nanoparticles using design of experiments

Harman, Clarissa L. G.; Fhionnlaoich, Niamh Mac; King, Aaron A.; Manning, Joseph R. H.; Lin, Wu; Scholes, Peter; Guldin, Stefan; Davies, G. R.

doi:10.1039/d2ma00369d

Cited by 6 publications

(7 citation statements)

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“…028 (MC15‐S5) to 0.020 (MC15‐S14), in agreement with a recently reported work in which the monodispersity of spions@SiO 2 MNPs increases with increasing SiO 2 thickness. [ 57 ]…”

Section: Resultsmentioning

confidence: 99%

“…028 (MC15-S5) to 0.020 (MC15-S14), in agreement with a recently reported work in which the monodispersity of spions@SiO 2 MNPs increases with increasing SiO 2 thickness. [57] Table 1. Values of core size (D core ), total size (D T ), and shell size (D shell ) obtained from TEM micrographs by the size distribution of Figures S1-S3 (Supporting Information).…”

Section: Morphological and Structural Characterizationmentioning

confidence: 99%

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Role of Dipolar Interactions on the Determination of the Effective Magnetic Anisotropy in Iron Oxide Nanoparticles

et al. 2022

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Challenging magnetic hyperthermia (MH) applications of immobilized magnetic nanoparticles require detailed knowledge of the effective anisotropy constant (K eff ) to maximize heat release. Designing optimal MH experiments entails the precise determination of magnetic properties, which are, however, affected by the unavoidable concurrence of magnetic interactions in common experimental conditions. In this work, a mean-field energy barrier model (𝚫E), accounting for anisotropy (E A ) and magnetic dipolar (E D ) energy, is proposed and used in combination with AC measurements to a specifically developed model system of spherical magnetic nanoparticles with well-controlled silica shells, acting as a spacer between the magnetic cores. This approach makes it possible to experimentally demonstrate the mean field dipolar interaction energy prediction with the interparticle distance, d ij , E D ≈ 1/d ij 3 and obtain the E A as the asymptotic limit for very large d ij . In doing so, K eff uncoupled from interaction contributions is obtained for the model system (iron oxide cores with average sizes of 8.1, 10.2, and 15.3 nm) revealing to be 48, 23, and 11 kJ m −3 , respectively, close to bulk magnetite/maghemite values and independent from the specific spacing shell thicknesses selected for the study.

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“…028 (MC15‐S5) to 0.020 (MC15‐S14), in agreement with a recently reported work in which the monodispersity of spions@SiO 2 MNPs increases with increasing SiO 2 thickness. [ 57 ]…”

Section: Resultsmentioning

confidence: 99%

Section: Morphological and Structural Characterizationmentioning

confidence: 99%

Role of Dipolar Interactions on the Determination of the Effective Magnetic Anisotropy in Iron Oxide Nanoparticles

et al. 2022

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“…In particular, given the nonergodic nature of polymer amphiphile self-assembly, a high-throughput, multivariate approach may prove insightful as to the factors affecting the self-assembled structures. [40,44,45]…”

Section: Discussionmentioning

confidence: 99%

Bottom‐Up Preparation of Phase‐Separated Polymersomes

Almadhi,

Forth,

Rodriguez‐Arco

et al. 2023

Macromolecular Bioscience

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A bottom‐up approach to fabricating monodisperse, two‐component polymersomes that possess phase‐separated (“patchy”) chemical topology is presented. This approach is compared with already‐existing top‐down preparation methods for patchy polymer vesicles, such as film rehydration. These findings demonstrate a bottom‐up, solvent‐switch self‐assembly approach that produces a high yield of nanoparticles of the target size, morphology, and surface topology for drug delivery applications, in this case patchy polymersomes of a diameter of ≈50 nm. In addition, an image processing algorithm to automatically calculate polymersome size distributions from transmission electron microscope images based on a series of pre‐processing steps, image segmentation, and round object identification is presented.

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“…Although the top-down approach is suitable for large-scale production, they may not guarantee proper control over particle size and quality. , In contrast, chemical methods follow a bottom-up approach involving condensation of a material’s atoms or molecular entities in solution (i.e., wet chemical method: coprecipitation, sol–gel, microemulsion, hydrothermal, solvothermal, sonochemical, electrochemical, or thermal decomposition) or in gas phase (i.e., flame, laser, or plasma reactors). One of the most conventional techniques for SPION synthesis is coprecipitation of ferrous and ferric ion aqueous salt solutions with a base; however, its applicability is often limited by agglomeration, poor crystallinity, and polydispersity . Recent efforts to overcome these drawbacks include the use of ultrasound, preparation of magnetite nanoparticles under static magnetic field, and use of alkanolamines as base .…”

Section: Spion Synthesis Key Properties and Main Barriers In Front Of...mentioning

confidence: 99%

“…SPIONs are susceptible to oxidation, agglomeration, and lack of affinity for biomolecules without appropriate surface coating/modification. , Thus, it is important to understand the role of their surface coating on waste-activated sludge MW prehydrolysis applications. The reason for agglomeration is attributed to high surface area, van der Waals forces of attraction, and dipole–dipole interactions between the particles .…”

Section: Spion Synthesis Key Properties and Main Barriers In Front Of...mentioning

confidence: 99%

Superparamagnetic Iron Oxide Nanoparticles as Additives for Microwave-Based Sludge Prehydrolysis: A Perspective

Hatinoglu,

Lee,

Fortner

et al. 2023

Environ. Sci. Technol.

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Wastewater treatment plants are critical for environmental pollution control. The role that they play in protecting the environment and public health is unquestionable; however, they produce massive quantities of excess sludge as a byproduct. One pragmatic approach to utilizing excess sludge is generating methane via anaerobic digestion. For this, a prehydrolysis step can significantly improve digestion by increasing biogas quality and quantity while decreasing final sludge volumes. One of the many prehydrolysis approaches is to deliver heat into sludge via microwave irradiation. Microwave-absorbing additives can be used to further enhance thermal degradation processes. However, the implications of such an approach include potential release of said additive materials into the environment via digested sludge. In this perspective, we present and discuss the potential of superparamagnetic iron oxide nanoparticles (SPIONs) as recoverable, hyperreactive microwave absorbers for sludge prehydrolysis. Due to their size and characteristics, SPIONs pack spin electrons within a single domain that can respond to the magnetic field without remanence magnetism. SPIONs have properties of both paramagnetic and ferromagnetic materials with little to no magnetic hysteresis, which can enable their rapid recovery from slurries, even in complicated reactor installations. Further, SPIONs are excellent microwave absorbers, which result in high local heat gradients. This perspective introduces the vision that SPION properties can be tuned for desirable dielectric heating and magnetic responses while maintaining material integrity to accomplish repeated use for microwave-enhanced pretreatment.

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Controlled synthesis of SPION@SiO₂ nanoparticles using design of experiments

Abstract: The synthesis of single-core superparamagnetic iron oxide nanoparticles (SPIONs) coated with a silica shell of controlled thickness remains a challenge, due to the dependence on a multitude of experimental variables....

Cited by 6 publications

References 83 publications

Role of Dipolar Interactions on the Determination of the Effective Magnetic Anisotropy in Iron Oxide Nanoparticles

Role of Dipolar Interactions on the Determination of the Effective Magnetic Anisotropy in Iron Oxide Nanoparticles

Bottom‐Up Preparation of Phase‐Separated Polymersomes

Superparamagnetic Iron Oxide Nanoparticles as Additives for Microwave-Based Sludge Prehydrolysis: A Perspective

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Controlled synthesis of SPION@SiO2 nanoparticles using design of experiments

Abstract: The synthesis of single-core superparamagnetic iron oxide nanoparticles (SPIONs) coated with a silica shell of controlled thickness remains a challenge, due to the dependence on a multitude of experimental variables....

Cited by 6 publications

References 83 publications

Role of Dipolar Interactions on the Determination of the Effective Magnetic Anisotropy in Iron Oxide Nanoparticles

Role of Dipolar Interactions on the Determination of the Effective Magnetic Anisotropy in Iron Oxide Nanoparticles

Bottom‐Up Preparation of Phase‐Separated Polymersomes

Superparamagnetic Iron Oxide Nanoparticles as Additives for Microwave-Based Sludge Prehydrolysis: A Perspective

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Controlled synthesis of SPION@SiO₂ nanoparticles using design of experiments