Daylight Bactericidal Titania Textiles: A Contribution to Nosocomial Infections Control

Matos, Joana C.; Oliveira, Cybelle Pereira de; Gonçalves, M. Clara

doi:10.3390/molecules24101891

Cited by 15 publications

(15 citation statements)

References 39 publications

(55 reference statements)

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“… ( a ) Molecular structure of cellulose; ( b ) Molecular structure of cellulose acetate (CA); ( c ) Amorphous titania ROS production Illustration obtained with permission from Matos et al [ 25 ]. …”

Section: Figurementioning

confidence: 99%

“…Titania, either amorphous or crystalline, has been shown to possess an outstanding bactericidal performance, even without previous ultra-violet (UV) stimuli [ 25 , 26 ]. Although the mechanistic details of the TiO 2 photocatalyzed reactions remain complex and are not completely understood [ 26 , 27 ], the role of TiO 2 is widely recognized in the formation of reactive oxygen species (ROS) (hydroxyl, superoxide anion radicals, O 2 , O 2 − ).…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and Characterization of Novel Integral Asymmetric Monophasic Cellulose–Acetate/Silica/Titania and Cellulose–Acetate/Titania Membranes

2020

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Two series of novel integral asymmetric monophasic hybrid membranes, cellulose acetate/silica/titania (CA/SiO2/TiO2—series 1) and cellulose acetate/titania (CA/TiO2—series 2), were developed by the coupling of sol-gel technology and a modified version of the phase inversion technique. SEM micrographs confirmed the integral asymmetric structure of all membranes. ATR-FTIR and ICP-OES results showed that, for the membranes in series 1, TiO2 is covalently bound to SiO2, which, in turn, is covalently bound to CA, while for the membranes in series 2, TiO2 is directly and covalently bound to the CA matrix. Permeation experiments revealed that the permeation performance of the membranes in series 1 is unaffected by the introduction of TiO2. In contrast, the introduction of TiO2 in the series 2 membranes increased the hydraulic permeability by a factor of at least 2 when compared to the pristine CA membrane and that incremental additions of TiO2 further increased the Lp.

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Section: Figurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Novel Integral Asymmetric Monophasic Cellulose–Acetate/Silica/Titania and Cellulose–Acetate/Titania Membranes

2020

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“…Following industrial demand, bactericide titania NPs were developed to impregnate cotton and polyester textiles for use in hospital environments [83]. Based on our previous work [84], amine was chosen to in situ functionalize titania NPs, due to its exceptional bonding afinity to both cotton and polyester textiles.…”

Section: Resultsmentioning

confidence: 99%

Photonic Band Gap and Bactericide Performance of Amorphous Sol-Gel Titania: An Alternative to Crystalline TiO2

et al. 2018

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In addition to its traditional application in white pigments, nanocrystalline titania (TiO2) has optoelectronic and photocatalytic properties (strongly dependent on crystallinity, particle size, and surface structure) that grant this naturally occurring oxide new technological applications. Sol-gel is one of the most widely used methods to synthesize TiO2 films and NPs, but the products obtained (mostly oxy-hydrated amorphous phases) require severe heat-treatments to promote crystallization, in which control over size and shape is difficult to achieve. In this work, we obtained new photocatalytic materials based on amorphous titania and measured their electronic band gap. Two case studies are reported that show the enormous potential of amorphous titania as bactericide or photocatalyst. In the first, amorphous sol-gel TiO2 thin films doped with N (TiO2−xNx, x = 0.75) were designed to exhibit a photonic band gap in the visible region. The identification of Ti-O-N and N-Ti-O bindings was achieved by XPS. The photonic band gaps were found to be 3.18 eV for a-TiO2 and 2.99 eV for N-doped a-TiO2. In the second study, amorphous titania and amine-functionalized amorphous titania nanoparticles were synthetized using a novel base-catalysed sol-gel methodology. All the synthesized amorphous TiO2 nanoparticles exhibit bactericide performance (E. coli, ASTME 2149-13).

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“…2.1. a-TiO 2 -NH 2 NPs Synthesis a-TiO 2 -NH 2 NPs are synthesized through a novel, alkaline, and room temperature solgel protocol, based on a previously reported methodology [17]. Briefly, a volume (280 µL) of aqueous sodium silicate solution (SSS; Na 2 O•SiO 2 , 27% wt.…”

Section: Methodsmentioning

confidence: 99%

Smart Shockwave Responsive Titania-Based Nanoparticles for Cancer Treatment

et al. 2021

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Nanomedicine is an emerging treatment approach for many cancers, characterized by having high sensitivity and selectivity for tumor cells and minimal toxic effects induced by the conventional chemotherapeutics. In these context, smart nanoparticles (NPs) are getting increasingly relevant in the development of new therapies. NPs with specific chemical composition and/or structure and being stimuli-responsive to magnetic, light or ultrasound waves are new promising tools. In the present work, amorphous-titania propyl-amine functionalized (a-TiO2-NH2) NPs, coated with bovine serum albumin (BSA), are stimulated with high energy shock waves to induce cytotoxic effects in cancer cells. First, a new method to coat a-TiO2-NH2 NPs with BSA (a-TiO2-NH2/BSA) was proposed, allowing for a high dispersion and colloidal stability in a cell culture media. The a-TiO2-NH2/BSA NPs showed no cancer cell cytotoxicity. In a second step, the use of shock waves to stimulate a-TiO2-NH2/BSA NPs, was evaluated and optimized. A systematic study was performed in in vitro cell culture aiming to impair the cancer cell viability: NP concentrations, time steps and single versus multiple shock waves treatments were studied. The obtained results highlighted the relevance of NPs design and administration time point with respect to the shock wave treatment and allow to hypothesize mechanical damages to cells.

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Daylight Bactericidal Titania Textiles: A Contribution to Nosocomial Infections Control

Cited by 15 publications

References 39 publications

Synthesis and Characterization of Novel Integral Asymmetric Monophasic Cellulose–Acetate/Silica/Titania and Cellulose–Acetate/Titania Membranes

Synthesis and Characterization of Novel Integral Asymmetric Monophasic Cellulose–Acetate/Silica/Titania and Cellulose–Acetate/Titania Membranes

Photonic Band Gap and Bactericide Performance of Amorphous Sol-Gel Titania: An Alternative to Crystalline TiO2

Smart Shockwave Responsive Titania-Based Nanoparticles for Cancer Treatment

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