Journal: Science Advances

Article Title: Minimally invasive electroceutical catheter for endoluminal defect sealing

doi: 10.1126/sciadv.abf6855

Figure Lengend Snippet: ( A ) In vitro closure of an artificially created intraluminal defect in PVC tube. ( B ) Proof of concept of device functionality to adhere ePATCH at a blind site on porcine aorta luminal wall. ( C ) Proof of concept of the device feasibility on closing a 2-mm defect in the porcine aorta connected to a mock circulatory loop. ( D ) The lap shear adhesion strength of ePATCH adhered to different biological substrates using an electric current of 1 to 3 mA. Control, DuraSeal—a commercially available sealant. (i) Schematic of the lap shear test assembly. (ii) The maximum shear adhesion strength at failure against collagen sheets. (iii) The maximum shear adhesion strength at failure against porcine aorta. (iv) The maximum shear adhesion strength at failure against porcine heart. ( E ) Interaction between the activated Voltaglue and porcine aorta as observed under a scanning electron microscope (SEM). T, tissue; B, bioadhesive aka Voltaglue. ( F ) Cross section showing the interface of the ePATCH against a porcine carotid artery as evaluated ex vivo through Masson’s trichrome (MT) staining. P, graphene electrode patch. MT staining colors the Voltaglue/ePATCH red and the tissues blue. The defect is that the artery is sealed using miniaturized CATRE. Data are presented as means ± SD, n = 3, and P values are calculated using one-way ANOVA with Tukey correction, * P < 0.05. Photo credit: Manisha Singh, NTU.

Article Snippet: 3D graphene ink was purchased from Dimension Inx, LLC, USA.

Techniques: In Vitro, Shear, Control, Microscopy, Ex Vivo, Staining

Journal: Science Advances

Article Title: Minimally invasive electroceutical catheter for endoluminal defect sealing

doi: 10.1126/sciadv.abf6855

Figure Lengend Snippet: ( A ) Artistic representation of potential application for the device showing pseudo-aneurysm repair. ( B ) Feasibility of the catheter for defect sealing in an ex vivo porcine carotid artery in the presence of blood. The closure of the defect is evaluated through H&E staining. H&E stains Voltaglue purple and carotid artery pink. H&E-stained sections from the ePATCH sealed vessels (right), a noninjured carotid artery (left), and an injured carotid artery (middle). Scale bars, 650 μm. ( C ) The thrombogenic response of Voltaglue, graphene electrodes, and biocompatible patch as assessed by the LDH colorimetric signal. UV-cured Voltaglue and DuraSeal—a commercially available sealant is used as control. The substrate is the only component that would contact the blood inside a lumen. ( D ) Proof of concept of vascular defect closure in pig’s aorta under a continuous blood flow at the rate of 10 ml min −1 . Blood flows in the direction of the red arrow. ( E ) Demonstration of the feasibility of the ePATCH to withstand the physiological pulsatile pressure and shear stresses. (i) Collagen tubing after defect creation and 5 hours after closure with the ePATCH and CATRE under pulsatile pressures of physiological range (60 to 125 mmHg). Three defects of 2-mm diameter each are closed with the catheter device. (ii) Pressure readings in the collagen tube demonstrating pulsatile flow before defect creation, immediately after closure, and 5 hours after closure. Data are presented as means ± SD, n = 3, and P values are calculated using one-way ANOVA with Tukey correction, * P < 0.05. Photo credit: Manisha Singh, NTU.

Article Snippet: 3D graphene ink was purchased from Dimension Inx, LLC, USA.

Techniques: Ex Vivo, Staining, Control, Shear

Journal: Micromachines

Article Title: Flexible Piezoresistive Sensors from Polydimethylsiloxane Films with Ridge-like Surface Structures

doi: 10.3390/mi14101940

Figure Lengend Snippet: ( a ) Preparation process of planar electrodes by spraying graphene ink on PI with mask. ( b ) Optical image of the test platform for measuring the sensitivity of the prepared piezoresistive sensors under mechanical compression (digital source meter: Keithley 2450; uniaxial compression tester: ZQ-32). ( c ) Comparison of the sensitivities of the piezoresistive sensors with LIG electrodes and planar electrodes. The same sensitive layer was prepared using sandpaper with an average size of 93 μm.

Article Snippet: A graphene ink was made from an oily graphene conductive slurry (Nanjing XFNANO Materials Tech Company Ltd., Nanjing, China) and ethanol (Shanghai, Aladdin Biochemical Technology Co., Ltd., Shanghai, China) was prepared.

Techniques: Comparison

Journal: ACS Omega

Article Title: Nanocoral-like Polyaniline-Modified Graphene-Based Electrochemical Paper-Based Analytical Device for a Portable Electrochemical Sensor for Xylazine Detection

doi: 10.1021/acsomega.2c00295

Figure Lengend Snippet: The digital images (a–c) show six graphene ink-based three-electrode devices fabricated on a chromatography paper; the WE, RE, and AE of a device; and the action of the wax barrier in the presence of water. The SEM images show the surface of a graphene ink WE (d) and cross sections (e,f) of the WE of a fabricated ePAD.

Article Snippet: Graphene ink (C2131121D3) and Ag/AgCl ink (C2090225P7) were purchased from Gwent Electronic Materials Co., Ltd. (United Kingdom).

Techniques: Chromatography

Journal: Scientific Reports

Article Title: 3D-printed NiFe-layered double hydroxide pyramid electrodes for enhanced electrocatalytic oxygen evolution reaction

doi: 10.1038/s41598-021-04347-9

Figure Lengend Snippet: Rheological properties and printability of graphene inks. (a) Viscosity vs. shear rate. (b) Storage (G′) and loss (G˝) moduli vs. ink shear stress. (c) Ink printability as a function of GMF concentrations. Scale bar: 500 μm.

Article Snippet: The graphene ink was packed into a syringe (3 mL barrel, EFD Inc.) and extruded through a micronozzle (nozzle inner diameter, ID = 100 μm) under an applied pressure ( P ).

Techniques:

Journal: Scientific Reports

Article Title: 3D-printed NiFe-layered double hydroxide pyramid electrodes for enhanced electrocatalytic oxygen evolution reaction

doi: 10.1038/s41598-021-04347-9

Figure Lengend Snippet: Conductivity of graphene inks and photographs of graphene 3D microstructures. (a) Ink conductivity as functions of graphene concentration. (b–d) Optical images of graphene 3D microstructures printed using 30 wt.% GMF. (b) KERI & KIMS, (c) 3D interdigitated, and (d) honeycomb architecture. Inset of (b) is a FE-SEM image of the 3D-printed “E” character.

Article Snippet: The graphene ink was packed into a syringe (3 mL barrel, EFD Inc.) and extruded through a micronozzle (nozzle inner diameter, ID = 100 μm) under an applied pressure ( P ).

Techniques: Concentration Assay