Paramagnetic Properties of Size-Controlled Squid Ink Particles Dispersed in Water

Matsuura, Toshihiko; Shimoyama, Yuhei; Kobayashi, Takanori; Taya, Yoshihiro; Ueno, Tetsuro

doi:10.7567/jjap.50.06gh13

Cited by 1 publication

(1 citation statement)

References 12 publications

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“…The optical, paramagnetic, and thermal properties of SIPs have been revealed. [14][15][16][17] Several applications for employing SIPs have been studied. It has been demonstrated that mixing SIPs with titania paste enhances porous structures in TiO 2 film electrodes for dye-sensitized solar cells.…”

Section: Introductionmentioning

confidence: 99%

Surface modification of natural ink particles for hair coloring

Matsuura

Sugawara

Nishimura

et al. 2019

Jpn. J. Appl. Phys.

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We report a method to modify the surface of size-controlled ink particles (SIPs), consisting of natural eumelanin isolated from ink sacs of Sepia officinalis, through simple chemical reactions. The carboxyl group on the SIP was replaced with an amino group using cationization reagents. The original SIPs have a highly negative potential of −50.8 ± 0.6 mV. This value can be modified by cationization reagents. Increases in the surface potentials of the SIPs decreased the effect of blocking the aggregation through electrostatic repulsion. The original SIPs were repelled on negatively charged surfaces but adsorbed on positively charged surfaces. The opposite result was obtained in SIPs modified with cationization reagents. The specific interaction between the carboxyl group and the amino group might play a more important role than the overall electrostatic interactions at neutral pH. The results of this study should serve in the development of hair colorants utilizing SIPs.

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Section: Introductionmentioning

confidence: 99%