37 results match your criteria nanosized multilayer


Monodisperse amino-modified nanosized zero-valent iron for selective and recyclable removal of TNT: Synthesis, characterization, and removal mechanism.

J Environ Sci (China) 2021 May 30;103:69-79. Epub 2020 Oct 30.

School of Environment, Tsinghua University, Beijing 100084, China.

Nitroaromatic explosives are major pollutants produced during wars that cause serious environmental and health problems. The removal of a typical nitroaromatic explosive, 2,4,6-trinitrotoluene (TNT), from aqueous solution, was conducted using a new recyclable magnetic nano-adsorbent ([email protected]). This adsorbent was prepared by grafting amino groups onto [email protected] particles with a well-defined core-shell structure and demonstrated monodispersity in solution. Read More

View Article and Full-Text PDF

Multilayer surface construction for enhancing barrier properties of cellulose-based packaging.

Carbohydr Polym 2021 Mar 24;255:117431. Epub 2020 Nov 24.

Department of Chemical Engineering, University of New Brunswick, Fredericton, New Brunswick E3B5A3, Canada. Electronic address:

It has been a consistent challenge to develop eco-friendly packaging in its entire life cycle with multiple barriers. Herein, a lignocellulose-derived strategy was developed for enhancing barrier properties of cellulose-based packaging. Porosity and hydrophilicity of paper packaging were remedied by the sequential deposition of oxalic acid modified microfibrillated cellulose (OMFC) and infiltration of nanosized alkaili lignin (NAL). Read More

View Article and Full-Text PDF

Scalable and fast fabrication of holey multilayer graphene via microwave and its application in supercapacitors.

Nanotechnology 2021 Jan;32(4):045602

State Key Lab of Electrical Insulation and Power Equipment, Shaanxi Key Laboratory of Smart Grid, Xi'an Jiaotong University, Xi'an, Shaanxi Province, 710049, People's Republic of China.

By virtue of its high specific surface area and low tortuosity for ionic storage and transportation, holey graphene has come to be regarded as a promising material for energy storage devices, such as lithium ion batteries, and supercapacitors. For practical applications, a scalable and green preparation method for holey graphene is required. This work proposes a facile preparation method for holey graphene by simply microwaving pristine graphene in air. Read More

View Article and Full-Text PDF
January 2021

Effects of Amorphous and Nanocrystalline Structures on Hydrogen-Induced Optical Performance of Modulated Mg-Gd Films with Various Composition Fluctuations.

ACS Appl Mater Interfaces 2020 Jul 17;12(26):29605-29613. Epub 2020 Jun 17.

National Engineering Research Center of Light Alloy Net Forming, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, P. R. China.

Nanomodification and amorphization are vital for improving the hydrogenation properties of magnesium (Mg)-based alloys. However, comparisons of their positive effects have been rarely presented because their usual fabrication process of annealing is hard to control. In this study, after tuning the composition fluctuation range, self-assembled well-ordered multilayer MgGd films with an excessive amount of nanosized crystals were fabricated by deviating substrates to the edge of the sample stage, while relatively low crystallinity was gained at the center of the sample stage with a small composition fluctuation. Read More

View Article and Full-Text PDF

Tailorable Electrocatalytic 5-Hydroxymethylfurfural Oxidation and H Production: Architecture-Performance Relationship in Bifunctional Multilayer Electrodes.

ACS Nano 2020 Jun 8;14(6):6812-6822. Epub 2020 Jun 8.

Department of Chemistry, Yonsei University, Seoul 03722, Republic of Korea.

Water electrocatalytic splitting is considered as an ideal process for generating H without byproducts. However, in the water-splitting reaction, a high overpotential is needed to overcome the high-energy barrier due to the slow kinetics of the oxygen evolution reaction (OER). In this study, we selected the 5-hydroxymethylfurfural (HMF) oxidation reaction, which is thermodynamically favored, to replace the OER in the water-splitting process. Read More

View Article and Full-Text PDF

Modeling of Catalytic Centers Formation Processes during Annealing of Multilayer Nanosized Metal Films for Carbon Nanotubes Growth.

Nanomaterials (Basel) 2020 Mar 19;10(3). Epub 2020 Mar 19.

Research and Education Center "Nanotechnologies", Southern Federal University, Taganrog 347922, Russia.

The paper presents a theoretical model of the catalytic centers formation processes during annealing of multilayer nanosized metal films for carbon nanotubes growth. The approach to the description of the model is based on the mass transfer processes under the influence of mechanical thermoelastic stresses, which arise due to the difference in the thermal expansion coefficients of the substrate materials and nanosized metal layers. The thermal stress gradient resulting from annealing creates a drop in the chemical potential over the thickness of the film structure. Read More

View Article and Full-Text PDF

Tunable Fano-Resonant Metasurfaces on a Disposable Plastic-Template for Multimodal and Multiplex Biosensing.

Adv Mater 2020 May 23;32(19):e1907160. Epub 2020 Mar 23.

Bio-Acoustic MEMS in Medicine (BAMM) Laboratory, Canary Center at Stanford for Cancer Early Detection Department of Radiology, Stanford School of Medicine, Palo Alto, CA, 94304, USA.

Metasurfaces are engineered nanostructured interfaces that extend the photonic behavior of natural materials, and they spur many breakthroughs in multiple fields, including quantum optics, optoelectronics, and biosensing. Recent advances in metasurface nanofabrication enable precise manipulation of light-matter interactions at subwavelength scales. However, current fabrication methods are costly and time-consuming and have a small active area with low reproducibility due to limitations in lithography, where sensing nanosized rare biotargets requires a wide active surface area for efficient binding and detection. Read More

View Article and Full-Text PDF

Thin Film Coating with Highly Dispersible Barium Titanate-Polyvinylpyrrolidone Nanoparticles.

Materials (Basel) 2018 May 1;11(5). Epub 2018 May 1.

Department of Frontier Materials, Nagoya Institute of Technology, Nagoya 466-8555, Japan.

Thin BaTiO₃ (BT) coating layers are required in various multilayer ceramic technologies, and fine nanosized BT particles with good dispersion in solution are essential for this coating process. In this work, cubic and tetragonal phase monodispersed BT nanoparticles—which were referred to as LBT and HBT-PVP coated on their surface by polyvinylpyrrolidone (PVP) polymer—were prepared by low temperature synthesis (LTS) and hydrothermal method (HT) at 80 and 230 °C, respectively. They were applied for the thin film coating on polyethylene terephthalate (PET) and Si wafer substrates by a simple bar coating. Read More

View Article and Full-Text PDF

Corrosion Resistance of Nanosized Silicon Carbide-Rich Composite Coatings Produced by Noble Gas Ion Mixing.

ACS Appl Mater Interfaces 2017 Dec 14;9(51):44892-44899. Epub 2017 Dec 14.

Institute for Technical Physics and Materials Science, Centre for Energy Research, Hungarian Academy of Sciences , Konkoly Thege M. út 29-33, H-1121 Budapest, Hungary.

Ion beam mixing has been used to produce a silicon carbide (SiC)-rich nanolayer for protective coating. Different C/Si/C/Si/C/Si(substrate) multilayer structures (with individual layer thicknesses falling in the range of 10-20 nm) have been irradiated by Ar and Xe ions at room temperature in the energy and fluence ranges of 40-120 keV and 1-6 × 10 ion/cm, respectively. The effects of ion irradiation, including the in-depth distribution of the SiC produced, was determined by Auger electron spectroscopy depth profiling. Read More

View Article and Full-Text PDF
December 2017

Polycatenation tuned microporosity of two metal-tris(4'-carboxybiphenyl)amine frameworks with multilayer structures.

Dalton Trans 2017 Oct;46(39):13352-13355

State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China.

By employing a nanosized tris(4'-carboxybiphenyl)amine ligand to assemble with Zn ions, a novel trilayer network (FIR-37) and an unprecedented 2D → 3D microporous polycatenation framework (FIR-38) based on unusual tetralayers have been synthesized and structurally characterized. FIR-38 shows permanent porosity with a Langmuir surface area of 1408.4 m g. Read More

View Article and Full-Text PDF
October 2017

Microstructure, Optical and Photocatalytic Properties of TiO₂ Thin Films Prepared by Chelating-Agent Assisted Sol-Gel Method.

J Nanosci Nanotechnol 2016 Jan;16(1):504-14

Single and multilayer TiO₂ thin films coated on two types of soda-lime glass substrates (microscope slides and cylinders) were prepared by a chelating agent-assisted sol-gel method, using ethyl acetoacetate as a chelating agent, dip-coating and calcination at 500 °C for 2 h in air. Phase composition, microstructural, morphological and optical properties of thin films were comprehensively investigated by using XRF, advanced XRD analysis, Raman and UV-vis spectroscopy and AFM. It was found out that the thickness of thin films increases linearly with increasing number of deposited layers, indicating a good adhesion of the titania solution to a glass substrate as well as to a previously calcined layer. Read More

View Article and Full-Text PDF
January 2016

Manganese Phosphate Self-assembled Nanoparticle Surface and Its application for Superoxide Anion Detection.

Sci Rep 2016 06 30;6:28989. Epub 2016 Jun 30.

National and Local Joint Engineering Research Center of Biomedical Functional Materials, Jiangsu Key Laboratory of Biofunctional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210023, China.

Quantitative analysis of superoxide anion (O2(·-)) has increasing importance considering its potential damages to organism. Herein, a novel Mn-superoxide dismutase (MnSOD) mimics, silica-manganous phosphate (SiO2-Mn3(PO4)2) nanoparticles, were designed and synthesized by surface self-assembly processes that occur on the surface of silica-phytic acid (SiO2-PA) nanoparticles. The composite nanoparticles were characterized by fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), scanning electronic microscopy (SEM), electron diffraction pattern, energy dispersive spectroscopy (EDS) and elemental mapping. Read More

View Article and Full-Text PDF

Inhibitor encapsulated, self-healable and cytocompatible chitosan multilayer coating on biodegradable Mg alloy: a pH-responsive design.

J Mater Chem B 2016 Apr 23;4(14):2498-2511. Epub 2016 Mar 23.

Center for Biomedical Materials and Tissue Engineering, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China.

The design of functional biomaterials that respond intelligently to external stimuli has become a rapidly growing area with widespread interest. This work contributes to the development of a feedback-active anticorrosion system with intriguing self-healing ability to protect magnesium (Mg) from biocorrosion. The system was constituted by an inner micro/nano-porous, ceramic-like pre-coating developed readily from the substrate, and an outermost inhibitor (nanosized cerium (Ce) oxides) containing chitosan (CS) multilayers. Read More

View Article and Full-Text PDF

Polysaccharide Encrusted Multilayered Nano-Colloidal System of Andrographolide for Improved Hepatoprotection.

AAPS PharmSciTech 2017 Feb 23;18(2):381-392. Epub 2016 Mar 23.

CSIR-Central Institute of Medicinal and Aromatic Plants, P.O. CIMAP, Lucknow, 226015, India.

Andrographolide (AP), a phytoconstituent of Andrographis paniculata is reported as a potent hepatoprotective agent. However, utility of this molecule is restricted due to its low aqueous solubility, gastric instability and hence low bioavailability. It was aimed to formulate and characterize AP-loaded, natural biopolymer stabilized, multilayered nano-hydrocolloid delivery system. Read More

View Article and Full-Text PDF
February 2017

Facile synthesis of N-halamine-labeled silica-polyacrylamide multilayer core-shell nanoparticles for antibacterial ability.

J Mater Chem B 2015 Sep 19;3(36):7203-7212. Epub 2015 Aug 19.

College of Materials and Textiles, Zhejiang Sci-Tech University, Hangzhou 310018, China.

Silica-polymer antimicrobial composites with a core-shell nanostructure are often prepared through a polymeric process. However, it is difficult to control the polymerization degree of the polymers to give a uniform size distribution. In this article, we present a facile approach to produce antimicrobial [email protected] ([email protected]) core-shell nanoparticles, which were synthesized via an electrostatic self-assembly method using acyclic N-halamine polymeric polyacrylamide. Read More

View Article and Full-Text PDF
September 2015

Nanoarchitectured materials composed of fullerene-like spheroids and disordered graphene layers with tunable mechanical properties.

Nat Commun 2015 Feb 4;6:6212. Epub 2015 Feb 4.

High Pressure Collaborative Access Team (HPCAT), Geophysical Laboratory, Carnegie Institution of Washington, Argonne, Illinois 60439, USA.

Type-II glass-like carbon is a widely used material with a unique combination of properties including low density, high strength, extreme impermeability to gas and liquid and resistance to chemical corrosion. It can be considered as a carbon-based nanoarchitectured material, consisting of a disordered multilayer graphene matrix encasing numerous randomly distributed nanosized fullerene-like spheroids. Here we show that under both hydrostatic compression and triaxial deformation, this high-strength material is highly compressible and exhibits a superelastic ability to recover from large strains. Read More

View Article and Full-Text PDF
February 2015

Fabrication of nanocapsule carriers from multilayer-coated vaterite calcium carbonate nanoparticles.

ACS Appl Mater Interfaces 2014 Dec 19;6(23):21193-201. Epub 2014 Nov 19.

Department of Biomedical Engineering and ‡Department of Materials Science and Engineering, Texas A&M University , College Station, Texas 77843, United States.

Nanosized luminescent sensors were prepared as reagents for optical sensing and imaging of oxygen using ratiometric emission properties of a two-dye system. Polymeric capsules were fabricated utilizing poly(vinylsulfonic acid) (PVSA)-stabilized vaterite CaCO3 nanoparticles (CCNPs) as sacrificial templates. The buffer and polymeric surfactant requirements of the layer-by-layer (LbL) process were evaluated toward deposition of multilayer coatings and, ultimately, formation of hollow capsules using these interesting materials. Read More

View Article and Full-Text PDF
December 2014

Graphene multilayer as nanosized optical strain gauge for polymer surface relief gratings.

Nano Lett 2014 Oct 29;14(10):5754-60. Epub 2014 Sep 29.

Physical Chemistry II, Ruhr-Universität Bochum , Universitätsstrasse 150, 44780 Bochum, Germany.

In this paper, we show how graphene can be utilized as a nanoscopic probe in order to characterize local opto-mechanical forces generated within photosensitive azobenzene containing polymer films. Upon irradiation with light interference patterns, photosensitive films deform according to the spatial intensity variation, leading to the formation of periodic topographies such as surface relief gratings (SRG). The mechanical driving forces inscribing a pattern into the films are supposedly fairly large, because the deformation takes place without photofluidization; the polymer is in a glassy state throughout. Read More

View Article and Full-Text PDF
October 2014

Density functional theory modeling of multilayer "epitaxial" graphene oxide.

Acc Chem Res 2014 Nov 20;47(11):3331-9. Epub 2014 May 20.

School of Physics, School of Chemistry and Biochemistry, Georgia Institute of Technology , Atlanta, Georgia 30332, United States.

CONSPECTUS: Graphene oxide (GO) is a complex material of both fundamental and applied interest. Elucidating the structure of GO is crucial to achieve control over its properties and technological applications. GO is a nonstoichiometric and hygroscopic material with a lamellar structure, and its physical chemical properties depend critically on synthesis procedures and postsynthesis treatments. Read More

View Article and Full-Text PDF
November 2014

Efficient oxygen reduction electrocatalyst based on edge-nitrogen-rich graphene nanoplatelets: toward a large-scale synthesis.

ACS Appl Mater Interfaces 2014 Mar 5;6(6):3930-6. Epub 2014 Mar 5.

State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences , Lanzhou 730000, China.

The large-scale synthesis of nitrogen doped graphene (N-graphene) with high oxygen reduction reaction (ORR) performance has received a lot of attention recently. In this work, we have developed a facile and economical procedure for mass production of edge-nitrogen-rich graphene nanoplatelets (ENR-GNPs) by a combined process of ball milling of graphite powder (GP) in the presence of melamine and subsequent heat treatment. It is found that the ball milling process can not only crack and exfoliate pristine GP into edge-expanded nanoplatelets but also mechanically activate GP to generate appropriate locations for N-doping. Read More

View Article and Full-Text PDF

One-pot synthesis of iniferter-bound polystyrene core nanoparticles for the controlled grafting of multilayer shells.

Nanoscale 2014 Mar 28;6(5):2872-8. Epub 2014 Jan 28.

Compiègne University of Technology, CNRS Enzyme and Cell Engineering Laboratory, Rue Roger Couttolenc, CS 60319, 60203 Compiègne Cedex, France.

A novel approach using one-pot synthesis for the production of uniform, iniferter-bound polystyrene core nanoparticles of size 30-40 nm is described. Conventional oil-in-water emulsion polymerisation of styrene and divinylbenzene, combining a hybrid initiation system (thermal and UV), triggered sequentially, was employed to form the surface-bound thiocarbamate iniferters in situ. The iniferter cores were then used as seeds for re-initiating further polymerisation by UV irradiation to produce water-compatible core-shell nanoparticles. Read More

View Article and Full-Text PDF

Self-assembly of protein-based biomaterials initiated by titania nanotubes.

Langmuir 2013 Dec 20;29(48):15013-21. Epub 2013 Nov 20.

Department of Physics and Astronomy, University of North Carolina at Chapel Hill , Chapel Hill, North Carolina 27599-3255, United States.

Protein-based biomaterials are a promising strategy for creating robust highly selective biocatalysts. The assembled biomaterials must sufficiently retain the near-native structure of proteins and provide molecular access to catalytically active sites. These requirements often exclude the use of conventional assembly techniques, which rely on covalent cross-linking of proteins or entrapment within a scaffold. Read More

View Article and Full-Text PDF
December 2013

Growth of Hexagonal Columnar Nanograin Structured SiC Thin Films on Silicon Substrates with Graphene-Graphitic Carbon Nanoflakes Templates from Solid Carbon Sources.

Materials (Basel) 2013 Apr 16;6(4):1543-1553. Epub 2013 Apr 16.

Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China.

We report a new method for growing hexagonal columnar nanograin structured silicon carbide (SiC) thin films on silicon substrates by using graphene-graphitic carbon nanoflakes (GGNs) templates from solid carbon sources. The growth was carried out in a conventional low pressure chemical vapor deposition system (LPCVD). The GGNs are small plates with lateral sizes of around 100 nm and overlap each other, and are made up of nanosized multilayer graphene and graphitic carbon matrix (GCM). Read More

View Article and Full-Text PDF

Construction of hyaluronic acid noisome as functional transdermal nanocarrier for tumor therapy.

Carbohydr Polym 2013 Apr 8;94(1):634-41. Epub 2013 Feb 8.

College of Marine Life Science, Ocean University of China, Yushan Road, Qingdao 266003, Shandong Province, China.

To develop a functional nanosized transdermal drug delivery system for tumor therapy, amphiphilic hyaluronic acid (HA) based niosome was constructed combining transdermal and tumor targeting ability in one entity. HA esterified with monostearin, the conjugate labeled as HA-GMS self-assembled onto niosome surface and formed HA-niosome. The multilayer vesicle had small size (around 40 nm), good stability and desirable drug encapsulating efficacy, and well compatible with blood. Read More

View Article and Full-Text PDF

Lithium transport through nanosized amorphous silicon layers.

Nano Lett 2013 Mar 5;13(3):1237-44. Epub 2013 Feb 5.

Institute of Metallurgy, Thermochemistry and Microkinetics Group, Clausthal University of Technology, Robert-Koch-Strasse 42, D-38678 Clausthal-Zellerfeld, Germany.

Lithium migration in nanostructured electrode materials is important for an understanding and improvement of high energy density lithium batteries. An approach to measure lithium transport through nanometer thin layers of relevant electrochemical materials is presented using amorphous silicon as a model system. A multilayer consisting of a repetition of five [(6)LiNbO3(15 nm)/Si (10 nm)/(nat)LiNbO3 (15 nm)/Si (10 nm)] units is used for analysis, where LiNbO3 is a Li tracer reservoir. Read More

View Article and Full-Text PDF

Adhesive layer-by-layer films of carboxymethylated cellulose nanofibril-dopamine covalent bioconjugates inspired by marine mussel threads.

ACS Nano 2012 Jun 4;6(6):4731-9. Epub 2012 Jun 4.

Fibre and Polymer Technology, KTH Royal Institute of Technology, Teknikringen 56, SE 10044 Stockholm, Sweden.

The preparation of multifunctional films and coatings from sustainable, low-cost raw materials has attracted considerable interest during the past decade. In this respect, cellulose-based products possess great promise due not only to the availability of large amounts of cellulose in nature but also to the new classes of nanosized and well-characterized building blocks of cellulose being prepared from trees or annual plants. However, to fully utilize the inherent properties of these nanomaterials, facile and also sustainable preparation routes are needed. Read More

View Article and Full-Text PDF

Laser engineered multilayer coating of biphasic calcium phosphate/titanium nanocomposite on metal substrates.

ACS Appl Mater Interfaces 2011 Feb 5;3(2):339-50. Epub 2011 Jan 5.

School of Industrial Engineering, Purdue University , West Lafayette, Indiana 47906, USA.

In this work, laser coating of biphasic calcium phosphate/titanium (BCP/Ti) nanocomposite on Ti-6Al-4 V substrates was developed. A continuous wave neodymium-doped yttrium aluminium garnet (Nd:YAG) laser was used to form a robust multilayer of BCP/Ti nanocomposite starting from hydroxyapatite and titanium nanoparticles. In this process, low power coating is realized because of the strong laser-nanoparticle interaction and good sinterability of nanosized titanium. Read More

View Article and Full-Text PDF
February 2011

Structures and magnetic properties of electroless Ni multilayers on Fe/Si substrate.

J Nanosci Nanotechnol 2010 Jul;10(7):4706-10

Graduate Institute of Materials Science, National Yunlin University of Science and Technology, Section 3, Douliou, Yunlin 64002, Taiwan.

Nanosized single and multiple layers of electroless Ni films were deposited on Fe film. The multilayer films consisting of a Fe/(Ni1 Ni2)n structure, where Ni1 and Ni2 denote various electroless Ni films deposited in plating baths with different pH values, and n denotes layer numbers and equals to 2, 4, 8, and 16, were formed by alternately changing the pH value of plating baths under controlled deposition time during the deposition process. The ensuing results showed that the boundaries between films are almost even. Read More

View Article and Full-Text PDF

LbL fabricated poly(styrene sulfonate)/TiO(2) multilayer thin films for environmental applications.

ACS Appl Mater Interfaces 2009 Nov;1(11):2684-93

Department of Materials Engineering, Indian Institute of Science, Bangalore 560012, India.

Fabrication of multilayer ultrathin composite films composed of nanosized titanium dioxide particles (P25, Degussa) and polyelectrolytes (PELs), such as poly(allyl amine hydrochloride) (PAH) and poly(styrene sulfonate sodium salt) (PSS), on glass substrates using the layer-by-layer (LbL) assembly technique and its potential application for the photodegradation of rhodamine B under ultraviolet (UV) irradiation has been reported. The polyelectrolytes and TiO(2) were deposited on glass substrates at pH 2.5 and the growth of the multilayers was studied using UV/vis spectrophotometer. Read More

View Article and Full-Text PDF
November 2009

The preparation of sugar polymer-coated nanocapsules by the layer-by-layer deposition on the liposome.

Langmuir 2009 Sep;25(17):10020-5

Center for Chemical Biology, School of Fundamental Science and Technology, Graduate School of Science and Technology, Keio University, Kohoku-ku, Yokohama, 223-8522, Japan.

We intended to combine the liposomal preparation and the layer-by-layer deposition to prepare a nanosized capsule. Chitosan (CHI) was deposited to form the cationic polymeric layer onto a negatively charged liposomal surface and further deposition was carried out using anionic polymers dextran sulfate (DXS) or deoxyribonucleic acid (DNA). zeta-Potentials of nanocapsules changed between positive and negative charges at each deposition. Read More

View Article and Full-Text PDF
September 2009