Influence of Na and K contents on the antibacterial response of piezoelectric biocompatible NaxK1-xNbO3 (x = 0.2–0.8)

Electret‐induced antibacterial response of Mg1‐xCaxSi1‐xZrxO3 (x = 0–0.4) bioceramics

“…The negatively charged surface exhibited remarkable hydrophilicity, which decreases the bacterial cell population 86–89 . It has been reported that with the electrostatic repulsion, the hydrophilicity also plays an important role in enhancing the antibacterial response 38,40,86,88 . The charged surfaces generate a small electric field at the microscopic level and positively charged surfaces tend to produce higher levels of ROS such as OH −, O 2 ‐ , and H 2 O 2 , which kill the bacterial cells 36,90 .…”

“…17 The generation of ROS damages the bacterial cell wall 32–35 . In addition, bacteria resonate with electret surfaces through their electrical potential and microelectric field of the charged surface of the bacterial membrane 36–40 . Also, the external electric field (1 V/cm) improves the antibacterial response by preventing the development of biofilm at the implant site 35,41 …”

“…Recently, Deepak et al 38 . demonstrated the antibacterial efficacy of charged piezoelectric Na 0.5 K 0.5 NbO 3 bioceramics.…”

Piezoelectric Biocomposites for Bone Grafting in Dentistry

“…Compared with CS (CSLG sample) which could be considered a renowned antimicrobial agent, as expected, the sample 10HA-90KNN-CSLG seems to show a decreased effect against gram-negative bacteria (E. coli). As reported, the negative charge of poled KNN particles sides caused the slowing down of the bacterial membrane-biomaterial grains interactions [15,54]. Samples 90HA-10KNN-CSL 10HA-90KNN-CSL in the form of dry lyophili scaffolds were also tested, as described in the protocol in Section 2.2.7, on the same th strains: S. aureus, E. coli, and C. albicans.…”

“…Nevertheless, this can be achieved by piezoelectric stimulation [4,[9][10][11]. The weak piezoelectric effect of biopolymers is not enough to activate the osteoblasts, but stimulated piezoceramics could develop enough polarization for improved bio-signaling or calcium channels opening, charged biomolecule interaction, and pH-dependent processes [12][13][14][15]. The amino-polysaccharide chitosan can be an alternative material for the preparation of tissue-engineered scaffolds due to its biodegradability, adsorption properties, and ability to support cell differentiation [16].…”