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3441427 
Journal Article 
A New Strategy in the Synthesis of Hollow gamma-Al2O3 Nanosphere using Alginate Gel Casting Process 
Sadjadi, MS; Rostamizadeh, N 
2016 
1 
Research Journal of Biotechnology
ISSN: 0973-6263 
Research Journal of BioTechnology 
11 
4 
30-35 
English 
WOS:000374989500004 
In this work, we report fabrication of hollow gamma-Al2O3 nanospheres with ca. 250-350 nm in diameter and 20 nm in shell thickness by water in oil inverse microemulsion method at room temperature using cyclo-hexane containing span85 nonionic emulsifier and sodium alginate as coagulating agent. Al(NO3)(3)center dot 9H(2)O was used as precursor and cross-section builder between the polymer chains, (NH4)(2)SO4 or ammonia as pH tuning and calcination of the sample was finally performed at 650 degrees C for 3 hours. Characterization of the samples was then performed using X-ray diffraction (XRD) pattern and Fourier transform infrared (FTIR) spectroscopy. The surface morphology, hollow sphere diameter and wall thickness of the synthesized samples were examined by scanning electron microscopy (SEM). The specific surface area, average pore size and total pore volume of the samples were determined using BET technic and indicated higher specific surface area and total pore volume of the sample to be 226.25 m(2)/g and 0.3865 ml/g respectively. From the higher specific surface area and other high characteristics of hollow gamma-Al2O3, we can clearly infer about suitability of the hollow gamma-Al2O3 in a wide range of applications such as filters, membranes, sensors, catalyst carriers, piezoelectric ceramics, biomedical and construction materials. 
gamma-Al2O3; Inverse microemulsion technique; Casting method; Sodium alginate; Sorbitan trioleate (Span 85)