Development and characterization of multilayer films of polyaniline, titanium dioxide and CTAB for potential antimicrobial applications

Farias, Emanuel Airton O.; Dionisio, Natália A.; Quelemes, Patrick Veras; Leal, S. H.; Matos, José Milton Elias de; Filho, Edson Cavalcanti da Silva; Bechtold, Ivan H.; Leite, José Roberto S. A.; Eiras, Carla

doi:10.1016/j.msec.2013.11.002

Cited by 21 publications

(10 citation statements)

References 41 publications

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“…Antibacterial activity of TiO 2 has been presented in the literature; the packing, textile and health-care industries have successfully used TiO 2 in their products with the objective to reduce the risk of microorganism transmission. Adding to the biodegradable nature of PHB this research is dealing with a very promising compound [17][18][19][20][21][22][23][24][25][26] . The non-isothermal melt and cold crystallization, and melting processes of PHB/TiO 2 nanocompounds were investigated by differential scanning calorimetry (DSC) applying heating/cooling/reheating cycles (six different heating/cooling rates); thermal parameters related to these processes are presented with the main objective to provide a reference of crystallization and melting parameters for these compounds.…”

Section: Introductionmentioning

confidence: 99%

Effect of heat cycling on melting and crystallization of PHB/TiO2 compounds

et al. 2018

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ObstractCompounds of poly(3-hydroxybutyrate) (PHB) and titanium dioxide (TiO 2 ) with filler content between 1% and 10% were prepared in a laboratory internal mixer. The effect of heating and cooling rates on the crystallization and melting of PHB/TiO 2 compounds was investigated by differential scanning calorimetry (DSC). Melt and cold crystallization rates rise with increasing cooling/heating rates. A higher cooling rate translates to a lower melt crystallization temperature, while a higher heating rate results in a higher cold crystallization temperature. TiO 2 promotes melt crystallization of PHB, behaving as a nucleant agent. The total crystallinity developed after melt and cold crystallization decreases for low levels of TiO 2 , i.e. 2% per weight, and is almost independent of the heating/cooling rate. The melting temperatures and rates are minimally affected by both the heating rate and filler content. The results suggest that the desired PHB microstructure can be controlled by filler content and adjusted heating/cooling rate.

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Section: Introductionmentioning

confidence: 99%

Effect of heat cycling on melting and crystallization of PHB/TiO2 compounds

et al. 2018

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“…Therefore, in this study, the in vitro antimicrobial activity of the NBrHAp suspensions and coatings was assessed using Gram-positive, Gram-negative and fungal microbial strains. Staphylococcus aureus is an infectious pathogen and has been recognized as being one of the most important bacteria responsible for severe morbidity and often fatal infections in humans [58][59][60][61][62]. Staphylococci are frequently found in hospitals, households, and are also present in the food industry and on different surfaces.…”

Section: Resultsmentioning

confidence: 99%

Nitrogen and Bromide Co-Doped Hydroxyapatite Thin Films with Antimicrobial Properties

et al. 2021

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Hydroxyapatite (Ca10(PO4)6(OH)2, HAp), due to its high biocompatibility, is widely used as biomaterial. Doping with various ions of hydroxyapatite is performed to acquire properties as close as possible to the biological apatite present in bones and teeth. In this research the results of a study performed on thin films of hydroxyapatite co-doped with nitrogen and bromine (NBrHAp) are presented for the first time. The NBrHAp suspension was obtained by performing the adapted co-precipitation method using cetyltrimethylammonium bromide (CTAB). The thin layers of NBrHAp were obtained by spin-coating. The stability of the NBrHAp suspension was examined by ultrasound measurements. The thin layers obtained by the spin-coating method were examined by scanning electron microscopy (SEM), optical microscopy (OM), and metallographic microscopy (MM). The presence of nitrogen and bromine were highlighted by energy-dispersive X-ray spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS) studies. Fourier transform infrared spectroscopy (FTIR) was used to highlight the chemical status of nitrogen and bromine. In addition, the powder obtained from the NBrHAp suspension was analyzed by XRD. Moreover, the in vitro antimicrobial activity of the NBrHAp suspensions and coatings was investigated using the reference microbial strains Staphylococcus aureus ATCC 25923, Escherichia coli ATCC 25922, and Candida albicans ATCC 10231. The results highlighted the successful obtainment of N and Br co-doped hydroxyapatite suspension for the first time by an adapted co-precipitation method. The obtained suspension was used to produce pure NBrHAp composite thin films with superior morphological properties. The NBrHAp suspensions and coatings exhibited in vitro antimicrobial activity against bacterial and fungal strains and revealed their good antimicrobial activity.

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“…Farias et al demonstrated good antibacterial properties of a TiO 2 /PANI/CTAB composite conductive membrane prepared from TiO 2 and cetyl trimethylammonium bromide (CTAB), which effectively prevented the growth of S. aureus on its surface. 125…”

Section: Nanomaterials Doping Modificationmentioning

confidence: 99%