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PubMed Journal Database | ACS applied materials & interfaces RSS

13:22 EDT 19th March 2019 | BioPortfolio

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Showing PubMed Articles 1–25 of 5,100+ from ACS applied materials & interfaces

In operando observation of neuropeptide capture and release on graphene FET biosensors with picomolar sensitivity.

Transmission electron microscopy (TEM) is being pushed to new capabilities which enable studies on systems that were previously out of reach. Among recent innovations, TEM through liquid cells (LC-TEM) enables in operando observation of biological phenom-ena. This work applies LC-TEM to the study of biological compo-nents as they interact on an abiotic surface. Specifically, biological recognition elements (BREs) based on biopanned peptides with affinity to neuropeptide Y are observed in operando on functio...

3D-Printed Anti-Fouling Cellulose Mesh for Highly Efficient Oil/Water Separation Applications.

The ability of additive manufacturing to print mesh structure was exploited to fabricate highly efficient filtration meshes for oil/water separation applications. Through Direct Ink Writing (DIW) technique, pure cellulose acetate with a mesh architecture can be created easily, using cellulose acetate/ethyl acetate solution as the ink and simply drying off the solvent in ambient conditions. Besides conventional mesh structures, more complex structures can be fabricated in order to manipulate the pore size an...

Lotus Seedpod-Derived Hard Carbon with Hierarchical Porous Structure as Stable Anode for Sodium-Ion Batteries.

Hard carbon material is one of the candidates with great promise as anode active material for sodium-ion batteries (SIBs). Here, new types of biomass-derived hard carbons were obtained via one-step carbonization of lotus seedpods at 1000-1400 oC, respectively. The control of carbonization temperature proved to be significant on controlling the lattice characterization of lotus seedpod-derived hard carbon. Higher temperature generally promoted the lattice graphitization and thus generated more narrowed d-int...

Adding Solvent into Ionic-Liquid-Gated Transistor: The Anatomy of Enhanced Gating Performance.

Most studies of ionic liquid (IL) gated field effect transistors (FETs) focus on the extremely large electric field and capacitance induced in liquid/solid interfaces and correspondingly the significantly enhanced carrier density in semiconductors, which can appreciably improve the gating performance. However, how to boost the switching speed, another key property of gating performance of FETs, has been rarely explored. In this work, the gating performance of molybdenum disulfide (MoS2) FETs, gated by the m...

Enhanced Thermoelectric Performance of Quaternary Cu2-2xAg2xSe1-xSx Liquid-like Chalcogenides.

Liquid-like binary Cu2-δX (X = S, Se, and Te) chalcogenides and their ternary solid solutions have gained notable attention in thermoelectrics due to their interesting and abnormal thermal and electrical transport properties. However, the previous studies mainly focus on the single element alloying at either anion or cation site, whereas the investigation on cation/anion co-alloying is very rare so far. Here, a series of quaternary Cu2-2xAg2xSe1-xSx (x = 0.01, 0.03, 0.05, 0.1, 0.15) liquid-like copper chal...

Multifunctional Photo- and Magneto-responsive Graphene Oxide-Fe3O4 Nanocomposite-Alginate Hydrogel Platform for Ice Recrystallization Inhibition.

Tuning ice recrystallization (IR) has attracted tremendous interest in fundamental research and a variety of practical applications, including food and pharmaceutical engineering, fabrication of anti-icing coating and porous materials, and cryopreservation of biological cells and tissues. Although great efforts have been devoted for modulation of IR for better microstructure control of various materials, it still remains a challenge, especially in cryopreservation, where insufficient suppression of IR durin...

Mechanistic Insight into Photocatalytic Pathways of MIL-100(Fe)/TiO2 Composites.

The integration of metal-organic frameworks (MOFs) with semiconductors has attracted mounting attention for photocatalytic applications. However, more efforts are needed to unravel the interface structure in MOF/semiconductor composites and its role in charge transfer. Herein, a MIL-100(Fe)/TiO composite was synthesized as a prototypical photocatalyst and studied systematically to explore the interface structure and unravel the charge transfer pathways during the photocatalytic processes. The composite was ...

Protected Amino Acid-based Hydrogels Incorporating Carbon Nanomaterials for Near-infrared Irradiation-triggered Drug Release.

Molecular gels formed by self-assembly of low molecular weight gelators have received increasing interest due to their potential applications in drug delivery. In particular, the ability of peptides and amino acids to spontaneously self-assemble into three-dimensional fibrous network has been exploited in the development of hydrogels. In this context, we have investigated the capacity of binary mixtures of aromatic amino acid derivatives to form hydrogels. Carbon nanomaterials, namely oxidized carbon nanotu...

Encapsulation of emulsion droplets with metal shells for subsequent remote, triggered release.

A 2-step method to encapsulate an oil core with an impermeable shell has been developed. A thin metallic shell is deposited on the surface of emulsion droplets stabilised by metal nanoparticles. This thin shell is shown to prevent diffusion of the oil from within the core of the metal-shell microcapsules when placed in a continuous phase that fully dissolves the oil. The stabilising nanoparticles are sterically-stabilised by poly(vinyl pyrrolidone) chains and are here used as a catalyst/nucleation site at t...

Facile fabrication of an amentoflavone-loaded micelle system for oral delivery to improve bioavailability and hypoglycemic effects in KKAy mice.

In order to improve oral bioavailability and anti-diabetic efficacy of amentoflavone with multi-mechanisms, an oral micelle system was developed by using N-vinyl pyrrolidone-maleate-guerbet alcohol monoester polymer for the first time, which was designated as P(NVP-MGAM)/AF. After oral administration, P(NVP-MGAM)/AF enhanced the oral bioavailability of amentoflavone, which was approximately 3.2 times as much as that of amentoflavone solution. The animal study using the KKAy insulin resistant diabetes mouse ...

Nanopore Functionalized By Highly Charged Hydrogels For Osmotic Energy Harvesting.

The salinity gradient between brine and fresh water is an abundant source of power which can be harvested by two major membrane methods: pressure-retarded osmosis and reversed electro-dialysis. Nowadays, the latter technology is close to real application but still suffer from low power yield. The low membrane selectivity as well as complex membrane fabrication are main limiting factors. To improve that, we design a couple of ion selective membranes based on track etched polymer nanopore functionalized by hi...

High-Efficiency Omnidirectional Broadband Light-Management Coating Using the Hierarchical Ordered-disorder Nanostructures with Ultra Mechanochemical Resistance.

High-efficient light-management nanostructures are critical to various optical applications. However, in practical implementation, these structures have been limited by the needs to resist mechanical abrasion, erosion, chemical exposure, ultraviolet radiation, and performance deterioration by dust accumulation. To address these critical technological gaps, we herein report a conceptually different approach, employing a hierarchical nanostructure embedded with multilayer LightScribe-etched graphene (LSEG), c...

Three-Dimensionally Printed Stretchable Conductors from Surfactant-Mediated Composite Pastes.

The stretchable conductor is a critical prerequisite to achieve various forms of stretchable electronics. In particular, directly printable stretchable conductors have gathered considerable attention with a recent growing interest in a variety of large-area, deformable electronics. In this study, we have developed a chemical pathway of incorporating a surfactant with a moderate hydrophilic-lipophilic balance in formulating composite pastes for printed stretchable conductors, with a possibility of a vertical...

A Novel MnO-Graphite Dual-ion Battery and New Insights into Its Reaction Mechanism during Initial Cycle by Operando Techniques.

Dual ion battery complements lithium ion batteries in terms of the use of inexpensive materials and ease to construct cells. To improve the safety and energy density of dual ion battery, in this paper, a novel MnO-graphite dual-ion battery is reported for the first time. Microporous MnO materials is used as the anode, which exhibits a low conversion potential and low voltage hysteresis. The MnO/graphite dual-ion battery can deliver a capacity of 104 mAhg-1 at 0.5 C and exhibits good rate performances and cy...

Micropatterned Viral Membrane Clusters for Antiviral Drug Evaluation.

The function of biological nanoparticles, such as membrane-enveloped viral particles, is often enhanced when the particles form higher-order supramolecular assemblies. While there is intense interest in developing biomimetic platforms that recapitulate these collective properties, existing platforms are limited to mimicking individual virus particles. Here, we present a micropatterning strategy to print linker molecules selectively onto bioinert surfaces, thereby enabling controlled tethering of biomimetic ...

Defect-Free MOF-Based Mixed Matrix Membranes Obtained by Corona Crosslinking.

Functionalized UiO-66 MOF particles were covalently grafted with hydride-terminated polydimethylsiloxane (PDMS) via postsynthetic modification (PSM). These PDMS-coated MOF particles (termed here 'corona-MOF') were used in the preparation of mixed-matrix membranes (MMMs). Defect-free MMMs with weight loadings of 50% were achieved with corona-MOF particles, attributed to the improved dispersibility of the corona-MOF particles and covalent linkages between the corona-MOF particles and the polymer matrix. The P...

An Applicable Superamphiphobic Ni/Cu Surface with High Liquid Repellency Enabled by the Electrochemical Deposited Dual-Scale Structure.

Till now, scalable fabrication and utilization of superamphiphobic surfaces based on sophisticated structures remains challenging. Herein we develop an applicable superamphiphobic surface with nano-Ni pyramid/micro-Cu cone structures prepared by the cost-effective electrochemical deposition. More importantly, excellent dynamic wettability is achieved, exhibiting as ultralow sliding angle (~0°), multiple droplets rebounding (13 times) and a total rejection. The supportive cushions trapped within the dual-sc...

Thermo- and Photo-Responsive Actuator with Free-standing Carbon Nitride Film.

The development of versatile actuators that convert environmental energy (heat or light, especially sunlight) into mechanical energy remains a great challenge. Herein, free-standing carbon nitride films were prepared by the physical vapor deposition method using bulk g-C3N4 powder as a starting material. The carbon nitride films exhibited controllable deformation under the stimuli of heat and light. An alarm device for high temperature and an artificial hand for grasping and releasing an object were designe...

Facile Fabrication of Nanoscale Porphyrinic Covalent Organic Polymers for Combined Photodynamic and Photothermal Cancer Therapy.

Photodynamic therapy (PDT) of cancers is usually inefficient due to the relatively low level of oxygen in cancer cells, therefore, it needs to combine with other treatment strategies such as chemotherapy or photothermal therapy (PTT) to achieve the best anticancer efficacy. Although porphyrin-containing materials have been widely studied for PDT, the photothermal effect is rarely reported. Herein, nanoscale porphyrin-containing covalent organic polymers (PCOP) were produced via a room temperature solution-b...

Reversible Self-Healing for Preserving Optical Transparency and Repairing Mechanical Damage in Composites.

This work reports on the healing of optical properties, roughness, contact angle hysteresis, and shallow scratches in polymer/nanoparticle composites. A series of ternary composite blends [epoxy/halloysite nanotubes (HNTs)/cellulose acetate butyrate (CAB)] with various CAB concentrations were developed and subjected to different levels of mechanical loading. The optimized concentration of nanoparticle is 1.0 vol% and for CAB concentration of 3.0 vol% based on the mechanical reinforcement and wear-resistance...

Fabrication of Hydrazone-Linked Covalent Organic Frameworks Using Alkyl-amine as Building Block for High Adsorption Capacity of Metal Ions.

There are several researches on preparation and application of hydrazone-linked COFs, and all of them generally necessitate rigid aromatic amines. Herein, we report a strategy for design and synthesis of COF with flexible alkyl-amine as building block and intramolecular hydrogen bonding as knot in the network. The proof-of-concept design was demonstrated by exploring 1,3,5-triformylphloroglucinol (Tp) and oxalyldihydrazide (ODH) as precursors to synthesize a novel COF material (TpODH), in which the differen...

Virus-Mimicking Cell Capture Using Hetero-Valency Magnetic DNA Nano-Claws.

Synergy represents a natural approach for high-efficiency recognition in biological systems. Inspired by the recognition mechanism of viral infection of mammalian cells, here we develop hetero-valency magnetic DNA nano-claws with octopus arms morphology for synergetic cell capture. We demonstrated that the rigid-flexible DNA nano-claws can load multiple antibodies (Abs) targeting different epitopes for enhanced capture of cancer cells, especially significantly increasing the capture efficiency to MDA-MB-231...

Octahedral SnO/Graphene Composites with Enhanced Gas-Sensing Performance at Room Temperature.

Although high-energy facets on metal oxides are usually active and preferred for gas sensing, it is difficult to expose them according to thermodynamics. In this work, nanocomposites of SnO and graphene are prepared by a hydrothermal method. The SnO nanoparticles morph from a lance shape to an octahedral shape as the concentration of HCl in the solution is increased gradually from 6.5 vol% to 10 vol%. However, the SnO nanoparticles have an elongated octahedral shape if the concentration of HCl is increased ...

Ultrafine Pt Nanoparticles Stabilized by MoS2 / N-doped Reduced Graphene Oxide as Durable Electrocatalyst for Alcohol Oxidation and Oxygen Reduction Reactions.

Direct alcohol fuel cells (DAFCs) play a pivotal role in synthesis of catalysts due to their low cost, high catalytic activity, and long durability in half-cell reactions, which include anode (alcohol oxidation) and cathode (oxygen reduction) reactions. However, platinum catalysts suffer from CO tolerance, which affects their stability. The present study focuses on ultrafine Pt nanoparticles stabilized by flower-like MoS2/N-doped reduced graphene oxide (Pt@MoS2/NrGO) architecture was developed, via a facile...

Wavelength-Tunable Waveguide Emissions from Electrically Driven Single ZnO/ZnO:Ga Superlattice Microwires.

Due to the superlattice structures comprising periodic and alternating crystalline layers, one-dimensional (1D) photon crystal can be employed to expand immense versatility and practicality of modulating the electronic and photonic propagation behaviors, as well as optical properties. In this work, individual superlattice microwires (MWs) comprising ZnO and Ga-doped ZnO (ZnO/ZnO:Ga) layers were successfully synthesized. Wavelength-tunable multipeak emissions can be realized from electrically driven single s...


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