Nanoscience and Nanotechnology Letters

Description

Nanoscience and Nanotechnology Letters (NNL) is a multidisciplinary peer-reviewed journal consolidating nanoscale research activities in all disciplines of science, engineering and medicine into a single and unique reference source. NNL provides the means for scientists, engineers, medical experts and technocrats to publish original short research articles as communications/letters of important new scientific and technological findings, encompassing the fundamental and applied research in all disciplines of the physical sciences, engineering and medicine.

  • Impact factor
    1.44
  • 5-year impact
    0.89
  • Cited half-life
    1.60
  • Immediacy index
    0.31
  • Eigenfactor
    0.00
  • Article influence
    0.21
  • Website
    Nanoscience and Nanotechnology Letters
  • ISSN
    1941-4900
  • Document type
    Journal

Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: We calculate the phonons in h-boron nitride (h-BN) sheet by constructing a dynamical matrix using the force constants derived from the well known second generation reactive empirical bond order (REBO) potential by Brenner and co-workers. Our results are comparable to inelastic X-ray scattering as well as first principle calculations. For h-BN the frequencies are little lower than the corresponding ones for graphene as expected. At Γ point the optical modes (degenerate) lie near 1450 cm–1 for h-BN. The frequency regimes are easily distinguishable. The low frequency (ω → 0) modes are derived from acoustic branches of the sheet. The radial modes can be identified with ω → 600 cm–1. High frequency regime is above 1200 cm–1 (i.e., ZO mode) and consists of TO and LO modes. The present work aims to explore agreement between theory and experiment. A better knowledge of the phonon dispersion of h-BN sheet is highly desirable to model and understand the properties of boron nitride nanotubes (BNNTs). The development and production of BNNTs for possible applications need reliable and quick analytical characterization. Our results may serve as an accurate tool for the spectroscopic determination of tube radii and chirality's.
    Nanoscience and Nanotechnology Letters 07/2014; 6(7):606-611.
  • [Show abstract] [Hide abstract]
    ABSTRACT: Abrupt change in the lactate concentration in children under the age of three has been related to hepatic immaturity. An electrochemical lactate biosensor was developed by successfully binding lactate dehyrogenase (LDH) onto Fe3O4 nanoparticles via nafion. Towards this design, Fe3O4 nanoparticles were synthesized by thermal co-precipitation of ferric and ferrous chlorides. The structural and morphological properties of iron oxide (Fe3O4) nanoparticles were characterized using XRD and FE-SEM respectively. Polycrystalline nature of the particles was confirmed by XRD data. The size of the spherical shaped nanoparticles was found to be 24.97±4.98 nm. FT-IR spectroscopy was used to confirm the binding of LDH to Fe3O4 nanoparticles. A lactate detecting electrochemical biosensor was developed by fabricating the modified gold electrode (Au/NanoFe3O4/LDH) with immobilized LDH on Fe3O4 nanoparticles. An appreciable linear response to lactate in the range up to 0.14 µmol L-1 was observed with the response time of < 1 s, a detection limit of 1.28 nmol L-1, quantification limit of 4.22 nmol L-1 and sensitivity of 320 nA nM-1 cm-2. Michaelis-Menten constant (K_M^app) and maximum change in current (Imax) value for the immobilized enzyme were 0.024 ± 1.3×〖10〗^(-3) µmol L-1 and 0.98 µA respectively. The developed bio-electrode with nano-interface showed a very good reproducibility and stability.
    Nanoscience and Nanotechnology Letters 03/2014; 6(3):242-249.
  • [Show abstract] [Hide abstract]
    ABSTRACT: Optimal conditions for the biosynthesis of silver nanoparticles (AgNPs) by fungi Aspergillus foetidus were investigated. Condition of 0.2% salinity, 4 mM of AgNO3, pH 9, 10% diluted concentration of cell filtrate and incubation time of 72 h at 30 �C were found to be optimum for the biosynthesis of silver nanoparticles. The activity of nitrate reductase attained optimum level at 0.2% salinity, pH 9 and 30 �C. Activities of nitrate reductase in fugal cell filtrate were 0.5116 and 0.1711 �mol/ml/min, respectively, before and after the synthesis of AgNPs. The protein contents were 407.4 and 207.3 �g/ml respectively before and after the synthesis of AgNPs, and both the nitrate reductase activity and the protein content decreased after the biosynthesis of AgNPs, indicating a possible role for this enzyme in the biosynthesis of AgNPs. The rate of conversion of Ag+ to Ag0 and the concentration of the synthesized Ag0 were found to be 93.39% and 158.65 �g/ml, respectively. The minimum inhibitory concentration (MIC) of synthesized AgNPs was determined against selected plant pathogenic fungi of Aspergillus spp. and F. oxysporum, and MIC value of AgNPs in A. flavus was lowest 1.6 �g/ml.
    Nanoscience and Nanotechnology Letters 03/2014; 6(3):181-188.
  • [Show abstract] [Hide abstract]
    ABSTRACT: Tuberculosis (TB) still represents one of the most overshadowing public health issues, particularly in developing countries. The efforts that are currently being made by the scientific community are many and sprout on various fronts, but can be divided in three basic avenues: development of new vaccines for prevention, generation of new and advanced diagnostic tools, and finally improvement of the chemotherapy. An “outside-the-box” approach is hence needed to develop new and improved instruments to fight Mycobacterium tuberculosis, the causative agent of TB. Cutting-edge technologies, such as nanotechnologies, can provide innovative and powerful tools to conquer this ancient infectious disease. Here, some notable examples of how nanotechnologies have entered in infectious diseases field will be presented, discussing how the “white plague,” namely the TB, can represent a paradigm of a complex infectious disease whose several aspects must be kept in consideration.
    Nanoscience and Nanotechnology Letters 02/2014; 6:134 - 138.
  • [Show abstract] [Hide abstract]
    ABSTRACT: To fabricate films composed of POM functional molecules is crucial to both fundamental research and application. In the paper, a Cs2.5PW12O40 nanoparticle monolayer film was fabricated by a facile method using dodecatungstophosphoric acid (H3PW12O40) and Cs2CO3 as precursors via nanocasting route and colloidal crystal as template. The morphology, structure, and phase composition of samples were characterized by elemental analysis, XRD, UV-vis absorption spectroscopy, transmission electron microscope and scanning electron microscope techniques. This arrayed film constructed by pure cesium salt of dodecatungstophosphoric acid Cs2.5PW12O40 nanoparticles shows well dispersed distribution.
    Nanoscience and Nanotechnology Letters 01/2014; 6(5).
  • [Show abstract] [Hide abstract]
    ABSTRACT: In this paper, pure ZnO nanoparticles were prepared by electrospining method with the postannealing in air without any ferromagnetic dopant. The results of X-ray diffraction and Raman spectra showed that the samples have a single phase with wurtzite structure and are absent of impurity phases. High-resolution transmission electron microscopy (HRTEM) and selected area electron diffraction results also assisted the products single phase. Magnetic measurements indicated that ZnO nanoparticles showed room-temperature ferromagnetism. The origin of ferromagnetism is suggested to the oxygen vacancies. Furthermore, the Curie temperature of ZnO nanoparticles was estimated to be above 300 °C, rendering it a very good option for the next generation of spintronics.
    Nanoscience and Nanotechnology Letters 01/2014; 6(5).
  • [Show abstract] [Hide abstract]
    ABSTRACT: We demonstrate a simple method to fabricate polymer-metal nanocomposite thin film with high dielectric constants. Nanocomposite films are prepared by vapor phase co-evaporation of nickel and poly(vinylidene fluoride) (PVDF) in high vacuum. The electrical properties of the composites are strongly influenced by the metal content and changes in the microstructure. The microstructures of nanocomposites are determined by transmission electron microscopy. Their electrical conductivity is investigated as a function of metal content. It is shown that near the percolation threshold the electrical behavior of the polymer-metal nanocomposites change dramatically from insulating to metallic. Moreover, the dielectric constant also depends on the metal content and increases approaching the percolation threshold.
    Nanoscience and Nanotechnology Letters 01/2014; 6(6).
  • [Show abstract] [Hide abstract]
    ABSTRACT: A polymeric film was in-situ deposited on glassy carbon electrode (GCE) surface via electrochemical oxidation of 2-mercapto-4-amino-5-cyano-6-phenylpyrimidine (MACP). Scanning electron microscopy measurements indicated that the resulting polymeric film consisted of uniform nanoparticles. Electrochemical impedance spectroscopy revealed that the as-prepared organic film exhibited lower electron transfer resistance than that of the unmodified GCE. Electrochemical behaviors of methyl parathion (MP) at the polymeric film electrode surface were examined thoroughly. It was found that the oxidation peak current of MP were significantly increased. The remarkable increasing on the oxidation peak current clearly suggested that the novel polymeric film displayed strong enhanced effects on the MP oxidation. As a result, a sensitive and rapid electrochemical method was developed for the MP determination. The linear range was from 5.0 × 10–8 mol L–1 to 9.0 × 10–6 mol L–1, and the detection limit was as low as 1.2 × 10–8 mol L–1. This developed method was used to determine MP in cabbage samples, and the recoveries were in the range from 97.4% to 102.0%.
    Nanoscience and Nanotechnology Letters 01/2014; 6(4).
  • Nanoscience and Nanotechnology Letters 01/2014; 6(1):1-9.
  • [Show abstract] [Hide abstract]
    ABSTRACT: Pure tetragonal zirconia nanoparticles (ca. 4.0 nm) possessing a narrow size-distribution were synthesized with an oil/water interface approach by adjusting various reaction parameters such as aging temperature, reaction time, and concentration of sodium hydroxide. The transmission electron microscopy images and X-ray powder diffraction patterns indicated that the shapes of tetragonal zirconia and monoclinic zirconia nanoparticles were spherical and spindle-like, respectively. The formation and transformation mechanisms of zirconia have been proposed from both of aspects of energy and time. Low temperature, appropriate reaction time and high concentration of sodium hydroxide are kinetically beneficial for the formation of tetragonal zirconia nanoparticles. The zirconia transformation from small spherical tetragonal nanoparticles to large spindle-like monoclinic nanoparticles (ca. 491.8 × 154.3 nm) happened due to the decline of their total surface energy with the increases of temperature and reaction time. Moreover, by the use of tetragonal zirconia seeds, formation of tetragonal zirconia nanocrystals was obviously promoted and that of monoclinic zirconia nanocrystals was markedly inhibited, suggesting the non-aggregation and surface-deposition growth of tetragonal zirconia nanocrystals.
    Nanoscience and Nanotechnology Letters 01/2014; 6(4).
  • [Show abstract] [Hide abstract]
    ABSTRACT: Self-assembly morphologies of polystyrene-b-poly(acrylic acid) (PS-b-PAA) in aqueous solution were studied at various polymer concentrations and hydrophilic/hydrophobic chain length ratios using dissipative particle dynamics (DPD) computer simulation technique. It has been found that spherical and cylindrical structures could be obtained at various concentrations. Seen from the internal distribution, the micelle core was formed by aggregation of the hydrophobic PS blocks, while the hydrophilic PAA chains distributed on the outer surface of the micelle. With the growth of the hydrophilic PAA chains, more shell chains wrapped the core. This work provides deeper insight into the microstructure of polymeric micelles, which might guide the molecular design and experimental preparation of novel polymeric micelles with controlled structures.
    Nanoscience and Nanotechnology Letters 01/2014; 6(4).
  • [Show abstract] [Hide abstract]
    ABSTRACT: The toxicity effects of single wall carbon nanotubes (SWCNTs) on Escherichia coli (E. coli) and Bacillus atropaheus (B. a) were here investigated. As-received and chemically purified nanotubes were exposed to the aforementioned cells and representative samples of the interacting complexes were inoculated in an agar plates for colony-growth quantification. It was observed that the higher the concentrations of nanotube the higher the degree of toxicity on the cells. It was also observed, that the as-received nanotubes induced more toxicity on the microorganisms, than the purified nanotubes. Also, it was shown that whereas the E. coli is more susceptible to the toxic effects of nanotubes, especially to raw CNTs, the Bacillus spores were typically more resistance. Cell viability count through a fluorescent stain procedure was also performed on the E.coli, and it was observed that the longer the interacting times between the microorganisms and the nanotubes, the larger the number of apoptotic cells. It seems that the presence of the nickel catalyst in the “as-received” nanotubes is an important source of toxicity for the bacteria. Further purification process of the nanotubes, effectively removed the metal catalyst reducing their toxic properties. The current research program will strengthen the basis for tailoring the toxic properties of carbon nanotubes based antimicrobial applications.
    Nanoscience and Nanotechnology Letters 01/2014; 6(1):26.
  • [Show abstract] [Hide abstract]
    ABSTRACT: 3D flower-like nickel phosphide (Ni12P5) microstructures were successfully synthesized by a facile solvothermal route. X-ray powder diffraction (XRD) and Field Emission Scanning Electron Microscope (FE-SEM) images showed that the as-prepared Ni12P5 microstructures had a tetragonal phase and were composed of a large quantity of flower-like structures. Based on a series of the timedependent experiments, the formation mechanism of Ni12P5 flower-like microstructures were discussed. It was found that the as-prepared flower-like are assembled by many spherical particles. Furthermore, research also showed that the as-prepared flower-like Ni12P5 microstructures possess excellent photocatalytic activity and could photocatalytically degrade some typical organic dyes such as Safranine T, Methylene Blue, Methyl Orange and Rhodamine B under the irradiation of UV light.
    Nanoscience and Nanotechnology Letters 01/2014; 6(7).
  • [Show abstract] [Hide abstract]
    ABSTRACT: Scanning probe microscopy (SPM) has been extensively used as a characterization tool for several material properties. In this paper, the tackiness or stickiness of thermoplastic polyurethane (TPU) based polymer nanocomposites is observed using force displacement curves of SPM probe. The tip retraction profile is found to be significantly changed when only 1 wt% of nanofillers like nanographite (NG), iron coated nanographite (FeNG) and iron-nickel nanographite (FeNiNG) were dispersed in the polymer matrix. The observations herein are explained by determining surface roughness, lateral force microscopy (LFM) and dynamic mechanical analysis (DMA). Loss modulus and damping factor results show that the nanofiller matrix interaction hardens the polymer network, reduces the viscous or loss component of the nanocomposite films, thereby causing a significant reduction in tackiness of the polymer.
    Nanoscience and Nanotechnology Letters 01/2014; 6(5).
  • [Show abstract] [Hide abstract]
    ABSTRACT: Acid-responsive electrospun nanofibers are gaining considerable attention as highly versatile tools which offer responsive drug releasing carriers and tissue engineering scaffold. A feasible acidresponsive ibuprofen-loaded electrospun fibers was presented by introducing sodium bicarbonate (NaHCO3) into Poly(lactic-co-glycolic acid) via blend electrospinning. The acid-responsive electrospun fibers showed the uniform micro/nano fiber morphology and porous fibrous structures. In vitro release profiles showed that the ibuprofen release rates of fibers were significantly accelerated after incubation into pH 5.0 compared to pH 7.4 solutions. During the investigational period, almost no mass loss and weight reduction was detected. These acid-responsive electrospun fibers are promising as smart drug carriers for targeted drug delivery and tissue engineering scaffolds.
    Nanoscience and Nanotechnology Letters 01/2014; 6(4).
  • [Show abstract] [Hide abstract]
    ABSTRACT: Flexible Nano PZT/GFC piezoelectric composite material is pliable and tough. It has potential application prospect on the piezoelectric sensors or drives, especially used for complex surface condition fitly. The composite material was prepared by growing the PZT piezoelectric nanocrystals on the glass fiber cloth (GFC) using the hydrothermal method. The influences of hydrothermal reaction time, concentration of alkali, and the number of glass cloth on the preparation of the piezoelectric composite material were investigated. It was found that a lot of PZT nanocrystals grew intensively and firmly on the soft glass fiber cloth carrier. The quantity of the glass fiber cloth affected the PZT nanocrystalline synthesis, the crystallization performance of product decreased sharply with the number of the glass fiber cloth added. Cubic PZT nanocrystals are formed when the concentration of KOH is 10 mol/L and the reaction time is 72 h.
    Nanoscience and Nanotechnology Letters 01/2014; 6(4).
  • [Show abstract] [Hide abstract]
    ABSTRACT: To the best of our knowledge there are no reports about synthesizing the tungsten oxide (WO3) nanosflakes patterns on metallic tungsten (W) foil substrate. WO3 nanosflakes was successfully synthesized on the metallic tungsten foil via electrochemical wet etching method. Metallic tungsten foil was used as substrates in this technique. Without using any templates and catalysts, the self-organized W/WO3 nanoflakes can be obtained by simple electrochemical anodization of tungsten foil in 0.5 M NaF solution as the supporting electrolyte, applying a ramp potential of 20 V. The etching duration are 1, 2, and 3 hours at room temperature. After etching, the as-prepared products were characterized by scanning electron microscope (SEM), energy dispersive X-ray analysis (EDX) and X-ray diffraction (XRD).
    Nanoscience and Nanotechnology Letters 01/2014; 6(6).

Related Journals