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Li, Huan,Sinha, Tridib K.,Oh, Jeong Seok,Kim, Jin Kuk American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.16
<P>Inspired by the epidermis-dermis composition of human skin, here we have simply developed a lightweight, robust, flexible, and biocompatible single-electrode triboelectric nanogenerator (S-TENG)-based prototype of bilayer artificial skin, by attaching one induction electrode with unfoamed skin layer of microcellular thermoplastic polyurethane (TPU) foam, which shows high-performance object manipulation [by responding differently toward different objects, viz., aluminum foil, balloon, cotton glove, human finger, glass, rubber glove, artificial leather, polyimide, poly(tetrafluoroethylene) (PTFE), paper, and wood], due to electrification and electrostatic induction during contact with the objects having different chemical functionalities. Comparative foaming behavior of ecofriendly supercritical fluids, viz., CO<SUB>2</SUB> over N<SUB>2</SUB> under variable temperatures (e.g., 130 and 150 °C) and constant pressure (15 MPa), have been examined here to pursue the soft and flexible triboelectric TPU foam. The foam derived by CO<SUB>2</SUB> foaming at 150 °C has been prioritized for development of S-TENG. Foam derived by CO<SUB>2</SUB> foaming at 130 °C did not respond as well due to the smaller cell size, higher hardness, and thicker skin. Inflexible N<SUB>2</SUB>-derived foam was not considered for S-TENG fabrication. Object manipulation performance has been visualized by principal component analysis (PCA), which shows good discrimination among responses to different objects.</P> [FIG OMISSION]</BR>
Qi Chen,Tridib K. Sinha,Huan Li,Wenbo Li,김진국 한국고분자학회 2018 Macromolecular Research Vol.26 No.13
We have designed an efficient wound dressing fabric consisting of physically attached multicompartment (three layers) electrospun nanofibrous mats. Electrospining technique enables abundant porosity and large surface area into the fabric, ensuring enhanced water absorption and cell respiration purposes. Blend of water insoluble, biocompatible, antifungal, bactericidal, and glutinous chitosan with flexible polyethylene oxide (PEO) and herbomettalic mica has been used as the inner layer. Oxygen permeable, tissue compatible, and flexible thermoplastic polyurethane (TPU) has been used as the outer layer. Using some facile chemical approaches, blends of natural polysaccharide pullulan/polyvinyl alcohol (PVA), and in situ polymerized poly (acrylic acid-co-acrylamide)/PVA have been synthesized to fabricate the superabsorbent polymeric materials (SPM) based middle layers of the No. 1 and No. 2 dressings, respectively. The blend ratio, solution viscosity, and electrospinning conditions (i.e., voltage, injection rate, tip-to-collector distance, etc.) have been optimized to prepare each layers of the desired fabrics. Scanning electron microscope (SEM) images, water uptake measurements, and mechanical and thermal properties have been considered to characterize the fabric properties. Because of the more polar functional groups (i.e., -COOH, -CONH2, and -OH) and more crosslinking within the middle layer by glutaraldehyde, No. 2 fabric shows excellent mechanical property (i.e., tensile strength of > 11 MPa), faster (110 seconds) and higher (95%) fluid absorption efficacy, and better reusability (only 16% of water retention after drying for 7 days at room temperature) than No. 1 fabric. No. 1 fabric, in contrast, mainly consisting of H-bonding among the polymers having only -OH functional group, shows < 10 MPa of tensile strength, 75% fluid absorption within 150 seconds and poor reusability (27% of water retention).