Ultrasound-assisted dispersion of SrFe12O19 nanoparticles in organic solvents and the use of the dispersion as magnetic cosmetics

Strontium hexaferrite nanomagnets suspended in a cosmetic preparation: a convenient tool to evaluate the biological effects of surface magnetism on human skin

“…The SrFe 12 O 19 (SHF) dispersion procedure was adapted from earlier work (2). Briefly, 100 mg SHF powder was mixed with 50 mL propylene glycol acetyl‐methyl ether in an ultrasound bath (D‐80, 43 kHz, 80 W) for 2 h. After precipitation of primary particles, the solvent was removed by decantation and the residue was dried under vacuum at room temperature for 24 h. Then it was added to 1 mL glycerol and treated as above in an ultrasound water bath for 4 h. Finally, the suspension was mixed with 10 g of Dermud ™ cream (Ahava‐Dead Sea Laboratories, Holon, Israel) in order to obtain a cosmetic preparation containing 1% (w/w) of SHF nanoparticles.…”

“…Thus, magnetite nanoparticle-containing liposomes have been injected into rat tumor in vivo to induce local hyperthermy under an alternate magnetic field, and promote tumor immunity via Hsp70 protein expression (29). Our approach aimed to investigate the effects of a superficial magnetic field on skin biology, and consisted in stabilizing a cosmetic preparation enriched with 1% SHF nanoparticles (2). The suspension was subsequently magnetized, and applied uniformly to constitute a static magnetic field on the skin surface.…”

“…In this direction, surface magnetism provides one avenue for exploration. Here, we present the development of a preliminary work by Ahava‐Dead Sea Laboratories (2, 3), which consisted in incorporating and stabilizing strontium hexaferrite (SrFe 12 O 19 or SHF) nanomagnets into a cosmetic cream, in order to analyze the biological effects of a superficial, static magnetic field on human skin.…”

Tailoring magnetic properties of self-biased hexaferrites using an alternative copolymer of isobutylene and maleic anhydride

“…Magnetic slurries are inherently prone to the aggregation that mainly derives from the conventional Van Der Waals attraction and magnetic coherence caused by their large magnetocrystalline anisotropy. 7 Finding a practicable way to reduce this aggregation is a challenge. Generally, in order to keep adequate fluidity and sufficient strength, various kinds of dispersants and binders had been introduced simultaneously, which inevitably causes the preparation process complication.…”

Influence of surfactants on co-precipitation synthesis of strontium ferrite

“…A variety of techniques have been used to prepare strontium ferrite (SrFe 12 O 19 ) of nano-scale including co-precipitation method [6][7][8][9][10], sol-gel process [11][12][13], glass crystallization [14], the mechanical alloying method [15][16][17], self-propagation [18,19], microemulsion [20], microwave [21][22][23], hydrothermal [24] and ultrasound-assisted synthesis [25]. Among them, the coprecipitation is one of the conventional and inexpensive methods to synthesize the strontium ferrite.…”