Hierarchical Structure and Magnetic Behavior of Zn-Doped Magnetite Aqueous Ferrofluids Prepared from Natural Sand for Antibacterial Agents

TAUFIQ, AHMAD; YULIANTIKA, DEFI; SUNARYONO, SUNARYONO; SAPUTRO, ROSY E.; HIDAYAT, NURUL; MUFTI, NANDANG; SUSANTO, HENDRA; SOONTARANON, SIRIWAT; NUR, HADI

doi:10.1590/0001-3765202120200774

Acessibilidade / Reportar erro

Brasil

Anais da Academia Brasileira de Ciências

Español English

Brasil

Español English

sumário « anterior atual seguinte »

Sumário

PHYSICAL SCIENCES • An. Acad. Bras. Ciênc. 93 (4) • 2021 • https://doi.org/10.1590/0001-3765202120200774 copy

Hierarchical Structure and Magnetic Behavior of Zn-Doped Magnetite Aqueous Ferrofluids Prepared from Natural Sand for Antibacterial Agents

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

This study performs natural sand-based synthesis using the sonochemical route for preparing Zn-doped magnetite nanoparticles. The nanoparticles were dispersed in water as a carrier liquid to form Zn-doped magnetite aqueous ferrofluids. Structural data analysis indicated that the Zn-doped magnetite nanoparticles formed a nanosized spinel structure. With an increase in the Zn content, the lattice parameters of the Zn-doped magnetite nanoparticles tended to increase because Zn²⁺ has a larger ionic radius than those of Fe³⁺ and Fe²⁺. The existence of Zn–O and Fe–O functional groups in tetrahedral and octahedral sites were observed in the wavenumber range of 400–700 cm^–1. The primary particles of the Zn-doped magnetite ferrofluids tended to construct chain-like structures with fractal dimensions of 1.2–1.9. The gas-like compression (GMC) plays as a better model than the Langevin theory to fit the saturation magnetization of the ferrofluids. The ferrofluids exhibited a superparamagnetic character, with their magnetization was contributed by aggregation. The Zn-doped magnetite ferrofluids exhibited excellent antibacterial activity against gram-positive and negative bacteria. It is suggested that the presence of the negatively charged surface and the nanoparticle size may contribute to the high antibacterial activity of Zn-doped magnetite ferrofluids and making them potentially suitable for advanced biomedical.

Key words
Iron sand; Zn-doped magnetite; aqueous ferrofluid; fractal structure; antibacterial agent

Samples	2-theta₍₃₁₁₎(°)	$a = b = c$ (Å)	$V$ (Å)³	Crystallite size (nm)	$R$ wp	Gof	$M_{w}$ (g/mol)	Ionic distribution
Y1	35.70	8.370(4)	584.4(3)	8.6(3)	19.35	0.59	1852.4	[Fe $_{1}^{3 +}$ ] $_{A}$ [Fe $_{1}^{2 +}$ Fe $_{1}^{3 +}$ ] $_{B}$ O $_{4}^{2 -}$
Y2	35.69	8.383(3)	589.1(3)	8.2(2)	19.56	0.61	1854.9	[Zn $_{0.1}^{2 +}$ Fe $_{0.9}^{3 +}$ ] $_{A}$ [Fe $_{0.9}^{2 +}$ Fe $_{1.1}^{3 +}$ ] $_{B}$ O $_{4}^{2 -}$
Y3	35.60	8.389(4)	590.4(4)	7.9(2)	19.14	0.60	1857.5	[Zn $_{0.2}^{2 +}$ Fe $_{0.8}^{3 +}$ ] $_{A}$ [Fe $_{0.8}^{2 +}$ Fe $_{1.2}^{3 +}$ ] $_{B}$ O $_{4}^{2 -}$
Y4	35.56	8.394(5)	591.4(7)	7.4(1)	19.79	0.62	1860.0	[Zn $_{0.3}^{2 +}$ Fe $_{0.7}^{3 +}$ ] $_{A}$ [Fe $_{0.7}^{2 +}$ Fe $_{1.3}^{3 +}$ ] $_{B}$ O $_{4}^{2 -}$
Y5	35.58	8.391(5)	590.8(6)	6.8(2)	19.39	0.62	1928.6	[Zn $_{0.3}^{2 +}$ Fe $_{0.7}^{3 +}$ ] $_{A}$ [Zn $_{0.1}^{2 +}$ Fe $_{0.6}^{2 +}$ Fe $_{1.3}^{3 +}$ ] $_{B}$ O $_{4}^{2 -}$

Samples	Monomer		Mass fractal aggregates
Samples	$μ$ (nm)	σ	$R$ (nm)	$ξ$ (nm)	$D$	$N_{a g g}$
Y1	3.0	0.30	13.4	35.1	1.2	6
Y2	4.1	0.41	12.2	45.2	1.4	5
Y3	4.1	0.41	11.3	132.1	1.4	5
Y4	4.3	0.43	9.1	36.1	1.4	3
Y5	4.4	0.37	13.5	27.0	1.9	8

Samples	Magnetic moment calc. ( $μ_{B}$ )	Saturation magnetization (emu/g)			$(\frac{ϕ_{H}}{H})$	$χ$	$γ$
Samples	Magnetic moment calc. ( $μ_{B}$ )	Calc.	Langevin	MGC	$(\frac{ϕ_{H}}{H})$	$χ$	$γ$
Y1	32.0	9.80	5.44	5.71	0.99	0.45	2
Y2	36.8	11.06	1.45	1.59	0.98	0.22	6
Y3	41.6	12.45	1.03	1.23	0.30	0.30	15
Y4	46.4	13.89	2.60	2.89	0.97	0.49	1
Y5	43.2	12.87	0.36	0.54	0.99	0.23	7

Academia Brasileira de Ciências Rua Anfilófio de Carvalho, 29, 3º andar, 20030-060 Rio de Janeiro RJ Brasil, Tel: +55 21 3907-8100 - Rio de Janeiro - RJ - Brazil
E-mail: aabc@abc.org.br

Acompanhe os números deste periódico no seu leitor de RSS

[1] Correspondence to: Ahmad Taufiq E-mail: ahmad.taufiq.fmipa@um.ac.id