In-situ electromechanical testing and loading system for dynamic cell-biomaterial interaction study

Polydimethylsiloxane/BaTiO3 Nanogenerators with a Surface-Assembled Mosaic Structure for Enhanced Piezoelectric Sensing

“…Figure d schematically illustrates the principle of piezoelectric signal production under compressive loading. The piezoelectric output of the NGs under cyclic loading is detected using a homemade machine and a charge amplifier (Figure e) . The open-circuit voltages of PDMS, PDMS@BTO s , PDMS@BTO d , and PDMS@BTO d+s samples (1 × 1.5 cm 2 with 1 μm thickness) under a compressive strain of 10% at 1 Hz are compared, as shown in Figure f, suggesting that a positive peak voltage of 6.2 V is generated on PDMS@BTO d+s , which is 50 and 250% higher than those on PDMS@BTO d and PDMS@BTO s , respectively.…”

“…The piezoelectric output of the NGs under cyclic loading is detected using a homemade machine and a charge amplifier (Figure 3e). 31 The open-circuit voltages of PDMS, PDMS@BTO s , PDMS@ BTO d , and PDMS@BTO d+s samples (1 × 1.5 cm 2 with 1 μm thickness) under a compressive strain of 10% at 1 Hz are compared, as shown in Figure 3f, suggesting that a positive peak voltage of 6.2 V is generated on PDMS@BTO d+s , which is 50 and 250% higher than those on PDMS@BTO d and PDMS@BTO s , respectively. Meanwhile, a slight voltage on PDMS is detected due to the triboelectric effect between the membrane and the electrode as mentioned in the literature.…”

“…To evaluate the piezoelectric performances of these NGs, a homemade electromechanical system was used to apply cyclic compression loading with various frequencies. 31 The electric signals produced from the NGs were measured using a charge amplifier (kd5002, Baofei vibration instrument factory, Jiangsu), which converted the charge into a voltage signal output. The signal output from the charge amplifier was acquired using a data acquisition card (HK_USB6202-SDIEIE, HKTECH, Zhengzhou) and then recorded and displayed in real time on the computer window using Labview software.…”

Integrated osteochondral differentiation of mesenchymal stem cells on biomimetic nanofibrous mats with cell adhesion-generated piezopotential gradients

“…For measurements, a NFM (20 × 10 × 0.95 mm 3 ) was clamped in the chucks of a home-made testing device with two electrodes connected to the two ends of the NFM, and stretched under controlled frequency and magnitude. 25 The piezoelectric outputs were detected by an electrometer (Keithley 6514 System, Beijing, China). The COMSOL Multiphysics software was used for the theoretical simulation of the piezoelectric outputs, and the elastic constant and piezoelectric and dielectric permittivity coefficients used in the piezoelectric constitutive equation were taken from a previous study.…”

“…2a and b, the piezoelectric potentials of NFMs (20 × 10 × 0.95 mm 3 ) were measured using a homemade in situ electromechanical testing and loading system under dynamic stretches with controlled frequency and force. 25 The relationship between the force magnitude and the piezoelectric output was further examined by changing the stretch force from 0.01 to 0.40 N. As the force increased, linear increases in the piezoelectric outputs were detected for PLLA-0 (1.03-1.78 V), PLLA-1.5 (1.21-2.56 V), PLLA-5 (1.55-3.44 V), PLLA-10 (2.15-4.69 V), PLLA-15 (2.66-5.61 V), and PLLA-20 (3.06-6.87 V) NFMs (Fig. 2d).…”