Cellulose nanofibrils (CNFs) in the form of hydrogels stand out as a platform biomaterial bioink formulation for 3D printing because their low cytotoxicity and structural similarity to extracellular matrices. In present study, scaffolds were successfully printed with low-concentration inks formulated by 1 w/v % 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO)-oxidized CNF less than gelatin methacrylate (GelMA). Quartz crystal microbalance dissipation monitoring (QCM-D) measurements...

Abstract Underwater superhydrophobic surfaces stand as a promising frontier in materials science, holding immense potential for applications underwater infrastructure, vehicles, pipelines, robots, and sensors. Despite this potential, widespread commercial adoption of these faces limitations, primarily rooted challenges related to material durability the stability air plastron during prolonged submersion. Factors such pressure, flow, temperature further complicate operational viability...

We present for the first time approaches to 3D-printing of nanocellulose hydrogel scaffolds based on double crosslinking, by in situ Ca2+ crosslinking and post-printing chemical with 1,4-butanediol diglycidyl ether (BDDE). Scaffolds were successfully printed from 1% hydrogels, their mechanical strength being tunable range 3 8 kPa. Cell tests suggest that 3D-printed BDDE-crosslinked supported fibroblast cells' proliferation, which was improving increasing rigidity. These render a new member...

Quartz crystal microbalance with dissipation monitoring (QCM-D) was employed to characterize the adsorption of model proteins, bovine serum albumin (BSA) and fibronectin (FN), polypyrrole doped dextran sulfate (PPy-DS) as a function DS loading surface roughness. BSA greater on surfaces increased roughness above what could be explained by increase in area alone. Furthermore, additional mass adsorbed rough films concomitant an rigidity protein layer. Analysis dynamic viscoelastic properties...

The growing need to develop surfaces able effectively resist biological fouling has resulted in the widespread investigation of nanomaterials with potential antifouling properties. However, preparation effective coatings is limited by availability reactive surface functional groups and our ability carefully control organize chemistries at a materials' interface. Here, we present two methods preparing hydrophilic low-fouling through reaction silica-nanoparticle suspensions predeposited films...

Hydrophilic surface chemistries can strongly bind water to produce surfaces that are highly resistant protein adsorption and fouling. The interfacial bound its distinct properties have intrigued researchers for decades, yet the relationship between three-dimensional structure function in antifouling coatings remains elusive. Here, we use hydrophilic, epoxy organosilane modified silica nanoparticles demonstrate cheap, robust, practically applied discover broad-ranging, ultralow fouling when...

Diatoms are a major component of the slime layers that form on artificial surfaces in marine environments. In this article, role played by diatoms during pioneering stages colonization three antifouling (AF) coatings, viz Intersmooth 360, Super Yacht 800 and fouling-release (FR) coating Intersleek 700, was investigated. The study conducted over distinct seasons two very different environments Australia, ie temperate Williamstown, Victoria tropical Cairns, Queensland. Diatom fouling occurred...

We report here the design of a novel conducting erodible platform based on water soluble polymer, poly[ammonium(3-thienyl)ethoxypropanesulfonate] (SPT). This study shows for first time polymeric system that is electroactive, fully and promotes cell adhesion growth.

In this review, we provide insight into protein interactions with organic conducting polymers, a class of "intelligent" and dynamic materials that offer unique strategies for controlling as prelude to developing wide range bioapplications. Following general introduction on the importance interactions, review initially focuses areas bioseparation biosensor applications. These applications amount an extensive body work; however, only brief overview purpose introducing palpable examples...

Outstanding protection of Cu by high-quality boron nitride nanofilm (BNNF) 1-2 atomic layers thick in salt water is observed, while defective BNNF accelerates the reaction toward water. The chemical stability, insulating nature, and impermeability ions through BN hexagons render a great choice for atomic-scale protection.

Hexagonal boron nitride nanosheets (h-BNNS) have been proposed as an ideal substrate for graphene-based electronic devices, but the synthesis of large and homogeneous h-BNNS is still challenging. In this contribution, we report a facile few-layer on melted copper via atmospheric pressure chemical vapor deposition process. Comparative studies confirm advantage using over solid catalyst substrate. The former leads to formation single crystalline that several microns in size mostly mono-...

Several recent studies have employed warm-water treatment of diatom cells to extract nominally bound extracellular polymeric substances. Where examined, the dominant neutral sugar in these extracts was glucose. In present study, we sought characterize structure glucose-rich polymers water diatoms and determine origin polymers. The marine surveyed were Phaeodactylum tricornutum, Cylindrotheca fusiformis, Craspedostauros australis Thalassiosira pseudonana. A freshwater species, Pinnularia...

We investigated the adhesive mucilage and mechanism of cell‐substratum adhesion two benthic raphid diatoms, marine species Craspedostauros australis E. J. Cox freshwater Pinnularia viridis (Nitzsch) Ehrenberg. SEM images P. C. cells revealed presence multistranded tethers that appear to arise along raphe openings extend for a considerable distance from cell before forming “holdfast‐like” attachment with substratum. propose result elongation/stretching composite strands secreted raphes during...

The role played by bacteria during the pioneering stages of colonisation on marine coatings was investigated over three distinct seasons in both tropical and temperate environments. Novel methods were developed to facilitate study adhered bacterial population test their native, hydrated state. approach eliminated destructive sample preparation techniques, including dehydration and/or removal from substratum surface prior analysis. Bacterial initial biofilm formation evaluated two antifouling...

Organic conducting polymers (OCPs) are currently the subject of intense research in area biomaterials and bioelectronics. Of OCPs, poly(3,4‐ethylenedioxythiophene) (PEDOT) has attracted significant interest, however there been little work on investigating incorporation biological compounds as dopant species polymer which aimed at enhancing biocompatibility biofunctionality material. Here, we incorporate dopants dextran sulphate, chondroitin alginate, into PEDOT investigate their influence a...

Fouling of subsurface structures by micro and macro-organisms is a centuries-old problem that can be better managed the use multi-functional materials modern fabrication techniques. Copper(I) thiocyanate, or CuTC, common coordination polymer reduces adherence growth marine organisms on underwater surfaces used as paint additive. Test samples polymers contained up to 20% (w/w) CuTC were fabricated using two methods: two-part epoxy system, cast into moulds cured at room temperature;...

Polypyrrole (PPy) is cationic in its conducting form, requiring a charge-balancing counterion, or dopant. The release of bioactive dopants, driven by the reduction PPy films, offers route to controlled drug delivery. Thiol-terminated long chain poly (ethylene glycol) (PEG) reacts with dodecylbenzene sulfonate (DBSA)-doped PPy, forming dense overlayer and partially liberating DBSA via chemical film. resulting PEG brush acts as barrier dopant diffusion from film, but proteins have been shown...

The negative impacts that arise from biological fouling of surfaces have driven the development coatings with unique physical and chemical properties are able to prevent interactions species. Here, we report on low-fouling hydrophilic presenting nanoscaled features prepared different size silica nanoparticles (SiNPs) functionalized zwitterionic chemistries. Zwitterionic sulfobetaine siloxane (SB) was reacted SiNPs ranging in 7 75 nm. Particle stability grafting density were confirmed using...

An analytical solution to impedance allows correlation of an effective electrode area with the and phase angle at low frequencies.

This work demonstrates polymer brushes grafted from conductive films which display dynamic surface switching dependent on salt, temperature and electrode potential. The electroactivity presented by the responsiveness of leads to an interface with multiple control parameters. Here, we demonstrate this concept grafting uncharged poly(ethylene glycol)methyl ether methacrylates conducting poly(3,4-ethylenedioxythiophene) (PEDOT), observe a temperature- salt-induced switch brush conformation,...

High conductivity poly(3,4-ethylene dioxythiophene) (PEDOT) was synthesised using vacuum vapour phase polymerization (VVPP). The process produces PEDOT composites which incorporate glycol within the polymer. To assess biocompatibility, a suite of analytical techniques were utilised in an effort to characterise level present and its impact on cell attachment proliferation. A small decrease fibroblast proliferation observed with increasing content composite. Keratinocyte by comparison showed...

Hydrogels composed of calcium cross-linked alginate are under investigation as bioinks for tissue engineering scaffolds due to their variable viscoelasticity, biocompatibility, and erodibility. Here, pyrrole was oxidatively polymerized in the presence sodium solutions form ionomeric composites various compositions. The IR spectroscopy shows that mild base is required prevent oxidant from attacking during polymerization reaction. resulting were isolated dried thin films or hydrogels aerogels....