Grain rotation is a well-known phenomenon during high (homologous) temperature deformation and recrystallization of polycrystalline materials. In recent years, grain has also been proposed as plasticity mechanism at low temperatures (for example, room for metals), especially nanocrystalline grains with diameter d less than ~15 nm. Here, in tensile-loaded Pt thin films under high-resolution transmission electron microscope, we show that the transitions from cross-grain dislocation glide...

Yarn-based supercapacitors and sensors can be easily integrated into textiles to form flexible lightweight self-powered wearable electronic devices, which enable stable continuous signal detection without an external power source. However, most current for systems lack the stretchability adapt complex human body deformations, restricts their application as a This study presents high-performance strain-insensitive yarn supercapacitor via prestretching in situ polymerization strategy, sensing...

Normal and electrically stimulated PC12 cell cultures the implantation of nerve guidance channels were performed to evaluate newly developed conductive biodegradable polymer composites. Polypyrrole (PPy) doped by butane sulfonic acid showed a significantly higher number viable cells compared with PPy polystyrenesulfonate after 6-day culture. The left proliferate for 6 days, PPy-coated membranes, showing less initial adherence, recorded same proliferation rate as did noncoated membranes....

Electrical stimulation (ES) has long been used as an alternative clinical treatment and effective approach to modulate cellular behaviours. In this work we investigated the effects of ES on human skin fibroblast activity, myofibroblast transdifferentiation consequence wound healing. Normal fibroblasts were seeded heparin-bioactivated PPy/PLLA conductive membranes, cultured for 24 h, then exposed 50 or 200 mV/mm 2, 4, 6 h. Following ES, cells either subjected various analyses re-seeded...

Bacterial cellulose (BC), a three-dimensional fibril, is natural polymer that can be used for many applications. BC effectiveness may improved by enhancing surface characteristics contributing to better physiologic interaction with human and animal cells intrinsically present antimicrobial agents. In the study, gentamicin-activated membranes were obtained chemically grafting RGDC peptides (R: arginine; G: glycine; D: aspartic acid; C: cysteine) using coupling agent...

NaCl and (NH₄)₂SO₄ were selected as typical inorganic salts (10 wt% addition) in order to analyze their effects on the hydrothermal carbonization (HTC) of sewage sludge (SS).

Abstract Extracellular matrix (ECM) stiffening is a typical characteristic of cartilage aging, which quintessential feature knee osteoarthritis (KOA). However, little known about how ECM affects chondrocytes and other molecules downstream. This study mimicked the physiological pathological stiffness human using polydimethylsiloxane (PDMS) substrates. It demonstrated that epigenetic Parkin regulation by histone deacetylase 3 ( HDAC3 ) represents new mechanosensitive mechanism affected...

Abstract Electrical fields are known to interact with human cells. This principle has been explored regulate cellular activities for bone tissue regeneration. In this work, Saos‐2 cells were cultured on conductive scaffolds made of biodegradable poly( L ‐lactide) and the heparin‐containing, electrically conducting polypyrrole (PPy/HE) study their reaction electrical stimulation (ES) mediated through such scaffolds. Both duration intensity ES enhanced cell proliferation, generating a unique...

The goal of this study was to investigate the feasibility bacterial cellulose (BC) scaffold support osteoblast growth and bone formation. BC produced by culturing Acetobacter xylinum supplemented with hydroxyapatite (HA) form membranes (without HA) BC/HA membranes. Membranes were subjected X-ray photoelectron spectroscopy (XPS) analysis determine surface element composition. further used evaluate growth, alkaline phosphatase activity nodule free calcium phosphate. However, XPS revealed...

Rationale: Prosthetic heart valves designed to be implanted percutaneously must loaded within delivery catheters whose diameter can as low 18 F (6 mm). This mandatory crimping of the devices may result in deleterious damages tissues used for valve manufacturing. As bovine and porcine pericardial tissue are currently given preference because their excellent availability traceability, a preliminary comparative study was undertaken highlight potential advantages. Materials methods: Bovine...

The aim of this study was to design a new natural/synthetic bioactive bone scaffold for potential use in replacement applications. We developed tri-component osteogenic composite made collagen (Coll), hydroxyapatite (HA) and poly(l-lactide-co-ɛ-caprolactone) (PLCL). This Coll/HA/PLCL combined with human osteoblast-like cells obtained by differentiation dental pulp stem (DPSCs) engineer tissue vitro. Results show that the 3D highly porous, thereby enabling cell adhesion growth. Cultured...

A reinforced soft polypyrrole membrane.

Abstract Stretchable conductive fibers have attracted much attention due to their potential use in wearable electronics. However, the ultra-high strain insensitive conductivity is hindered by mechanical mismatch Young’s modulus and failure of stretchable structures under large deformation. This challenge addressed with a elastic multifilament made polyurethane monofilaments that are surface-coated buckled polypyrrole (PPy) which flexibility improved sodium sulfosalicylate. Such parallel PPy...

This study investigated the basic biocompatibility aspects of two types polypyrrole (PPy)-coated polyester fabrics for possible use as vascular prostheses. These PPy-coated fabrics, PPy-Phos and PPy-Plas, were sterilized with ethylene oxide (EO) following characterizations performed: surface morphology by scanning electron microscope, EO residuals analysis headspace method, acute systemic toxicity in mouse model, hemolysis, blood coagulation time, viability proliferation endothelial cells...

Electrically conductive polypyrrole is very attractive for tissue engineering because of its potential to modulate cellular activities through electrical stimulation. However, in vivo behaviors have not been fully studied. This paper investigates the biocompatibility and biostability PPy-coated polyester fabrics. Three fabrics were prepared using phosphonylation (PPy-Phos), plasma activation (PPy-Plas), plus heparin treatment (PPy-Plas-HE). Virgin fluoropassivated (F-PET) controls. The...

We report the electrical properties of a single conducting polyaniline nanotube measured by standard four-terminal technique. Camphor sulfonic acid doped nanotubes were self-assembled template-free method. The directly conductivity is very high (∼31.4 S/cm), and its temperature dependence follows three-dimensional variable range hopping model. However, bulk pellets much smaller than itself (only 3.5×10−2 S/cm) ln ρ(T) linear in T−1/2, which due to large intertubular contact resistance. These...