1. Department of Chemistry, Federal University of Santa Maria, Av. Roraima 1000, Santa Maria/RS, CEP 97105-900, Brazil
2. Department of Physics, Federal University of Santa Maria, Av. Roraima 1000, Santa Maria/RS, CEP 97105-900, Brazil
3. Department of Engineering Technology and Construction Management, UNC Charlotte, 9201 University City Blvd., Charlotte, North Carolina 28223-0001, USA