Synthesis of Silica-Coated Fe₃O₄ Nanoparticles by Microemulsion Method: Characterization and Evaluation of Antimicrobial Activity

Table 1

Zone of inhibition (mm) of Fe₃O₄ NPs and silica-coated NPs against Gram-negative and Gram-positive bacterial strains and C. albicans fungi.

Samples	Zone of inhibition (mm) (Diameter)
	Gram-positive bacteria				Gram-negative bacteria				C. albicans(ATCC9955)
	Staphylococcus aurous(ATCC 25923)		Bacillus subtilis(ATCC6633)		Escherichia coli(ATCC25922)		Pseudomonas aeruginosa (ATCC7553)
	C1 10 mg/mL	C2 15 mg/mL	C1 10 mg/mL	C2 15 mg/mL	C1 10 mg/mL	C2 15 mg/mL	C110 mg/mL	C215 mg/mL	C110 mg/mL	C215 mg/mL
Fe3O4-30T	8	11	10	13	15	18	14	19	11	15
Fe3O4-50T	8	11	8	10	11	15	12	14	9	10
Fe3O4-80T	9	11	7	11	6	9	9	11	7	8
Fe3O4-30 SDS	8	10	9	14	7	11	14	19	12	13
Fe3O4-50 SDS	9	10	9	12	9	11	8	12	11	12
Fe3O4-80 SDS	8	10	9	13	13	18	10	12	9	12
Fe3O4-30T dil.	8	13	8	13	6	11	9	14	12	14
Fe3O4-30T conc.	7	9	7	14	14	17	10	12	11	12
Silica-coated Fe3O4	10	14	11	12	14	18	7	15	8	10
Gentamicin (+ve)	12	14	14	14	14
DMSO (−)	No	No	No	No	No