Biofabrication offers a great potential for the fabrication of three-dimensional living tissues and organs by precisely layer-by-layer placing various tissue spheroids as anatomically designed. Inkjet printing cell-laden bioink is one most promising technologies enabling biofabrication, printability must be carefully examined it to viable biofabrication technology. In this study, droplet formation process has been studied in terms breakup time, size velocity, satellite using time-resolved...

ABSTRACT High‐performance carbon fibers (CFs) are currently produced primarily from polyacrylonitrile (PAN). However, the high cost of such CFs and environmental concerns during its manufacturing (from PAN) stimulating research on alternative bio‐based precursors environmentally friendly processing routes. This review summarizes recent studies pathways for converting cellulose lignin (most abundant renewable biomass) into suitable precursor CFs. The role various precursors, fiber spinning...

The sustainable solvent system acetic acid + water was used to simultaneously fractionate, solvate, and clean a softwood Kraft lignin for conversion carbon fibers. By exploiting the novel liquid–liquid equilibrium (LLE) phase behavior exhibited by this pseudoternary system, three fractionated–solvated precursors (FSLPs) of increasing molecular weight (7200, 13 800, 28 600) were obtained via continuous Aqueous Lignin Purification using Hot Acids (ALPHA) process. It is noteworthy that all...

ABSTRACT: Viscoelastic, thermal, and microstructural properties of plasticized soy protein isolate (SPI) films processed by thermal compaction are discussed. Thermogravimetric analysis indicates that exhibit substantial degradation at temperatures above 180 °C the processing temperature limit is about 150 °C. Dynamic mechanical existence multiple glass transition associated with glycerol‐ protein‐rich phases. Scanning electron micrographs cross‐sections containing 30 40 wt% glycerol indicate...

ABSTRACT Equi‐component blends of polyacrylonitrile (PAN) and lignin, i.e., with a lignin content as large 50 wt %, were successfully used precursors to produce carbon fibers. Rheological measurements demonstrated that increasing in spinning solution reduced shear viscosity normal stress, indicating decrease viscoelastic behavior. This was confirmed by Fourier transform infrared results show no discernable chemical reaction or crosslinking between PAN the solution. However, resulting fibers...

Production of high strength carbon fibers from bio-derived precursors is topical interest. Recently, we reported on dry-spinning a partially acetylated softwood kraft lignin to produce with superior properties, but the thermo-oxidative stabilization step required long time due slow heating rate needed prevent being heated too rapidly and sticking each other. Here report rapid strategy dual UV-thermoxidative (crosslinking) dry-spun that significantly reduces time. The undergo reaction close...

ABSTRACT: Soy protein isolate (SPI) was utilized as a biopolymer and glycerol used plasticizer to successfully produce light‐yellow, transparent films by thermal compaction technique. Flexible films, approximately 180 micrometers, could be produced at processing temperature of 150 °C pressure time 10 MPa 2 min, respectively. The dispersion among SPI macromolecules found diffusion‐limited process that accelerated intensive mixing. Films containing 30 wt% made from intensively mixed material...

ABSTRACT: Soy protein films were thermally laminated with either single or double coats of corn‐zein. Microstructural characterization the surfaces and cross‐sections reveals a ductile matrix soy component, but brittle layered structure for corn‐zein component. The hydrophobic nature improved water vapor barrier properties laminates, while superior oxygen characteristics remained unaffected, as compared base film. haze values laminates increased without much change in total light...

Electrophoresis plays an important role in many applications, which, however, has so far been extensively studied Newtonian fluids only. This work presents the first experimental investigation of particle electrophoresis viscoelastic polyethylene oxide (PEO) solutions through a microchannel constriction under pure DC electric fields. An oscillatory motion is observed region, which distinctly different from behavior polymer-free fluid. stream-wise oscillation continues until sufficient number...

The short- and long-term creep behaviors of ultra-high-molecular-weight polyethylene (UHMWPE) systems (compression-molded UHMWPE sheets self-reinforced composites) have been investigated. short-term (30-120 min) experiment was conducted at a load 1 MPa temperature range 37-62 degrees C. Based on data, the behavior 37 C predicted using time-temperature superposition analytical formulas. Compared to actual experiments up 110 days, values were found well describe properties materials. then...

Abstract Photo‐thermal dual‐curing of a carbon fiber reinforced photoresin is reported in this study. The primary limitation fibers that they are opaque to ultra‐violet (UV) light, and the resin present inside tow remains uncured if only photolytic mechanism used. Therefore, formulation was developed consisted acrylate ester bisphenol A‐epoxy (primary resin), 1‐hydroxycyclohexyl phenyl ketone (a photoinitiator), lauroyl peroxide (thermal initiator). were dispersed photocured by UV radiation....

ABSTRACT: BHA, BHT, rosemary extract, and α‐tocopherol were incorporated into low‐density polyethylene (LDPE) at the 0.1% level thermoformed 25‐mm‐dia, 0.25‐mm‐thick discs, which exposed to surface of fresh beef held in contact with a polyvinyl chloride (PVC) overwrap. On d 0, control treatment only PVC overwrap had greater “a” (redness) values, probably due transmission oxygen meat surface. However, by 7, lower redness values than any other treatments. By 8 9, packaged BHA‐impregnated film...

Abstract The electrical properties and electromagnetic shielding effectiveness (EM SE) of nanocomposites consisting heat‐treated carbon nanofibers (Pyrograf® III PR‐19, CNF) in a linear low density polyethylene (LLDPE) matrix were assessed. Heat treatment (HT) at 2500°C significantly improved their graphitic crystallinity intrinsic transport properties, thereby increasing the EM SE nanocomposites. Nanocomposites containing 11 vol% (20 wt%) PR‐19 HT displayed DC conductivity about 1.0 ± 0.1 ×...