size morphology and surface chemistry

... core (size and composition with atomic precision) and ligand surface (various ligand combinations and ratios of two ligands) The key strategy is to use the different affinity of thiolate ligands ... the same sized Au-Ag, Au-Pd, and Au-Pt NCs, are presently lacking On the other hand, Pd and/ or Pt based bi-MNCs incorporated with a few Au and/ or Ag atoms are also of importance,41 and their ... well as rich surface functionalities (e.g., carboxyl, hydroxyl, and amine groups) Develop a facial method to synthesize water-soluble and highly luminescent AuAg bi-MNCs, and understand the underlying...

Ngày tải lên: 01/10/2015, 17:27

... quick and gross idea on their shapes and sizes In this study we used TEM, HREM and HAADF, along with optical absorption spectroscopy to study the size, size distribution, fine structure and composition ... frequency and intensity of SPR band depend on the size, shape, structure and composition [39,40,45] of the metal nanoparticles While the techniques like TEM, HREM reveal the exact size and shape ... obtained size distribution histogram (Fig 4) was used First, the whole size distribution histogram was divided into several equal size ranges For each size range, corresponding average particle size...

Ngày tải lên: 04/06/2014, 15:20

... factor of 3, but also the size distribution has become a little bit narrower and lost part of its asymmetry, and, what is the important issue in this result, shape and arrangement of the particles ... samples are identical for parallel and perpendicular polarization a JEM 1010 operating at 100 kV and a JEM 4010 operating at 400 kV For this purpose, planar and cross-section preparation were ... Ag? and 1016/cm2 Au? ion implanted sample 123 1382 about 1.5–24 nm The frequency of the surface plasmon resonance of the non-irradiated glass (see Fig 2) appearing between those of pure Ag and...

Ngày tải lên: 22/06/2014, 00:20

Ngày tải lên: 24/12/2013, 18:15

... domain, while PABP12 and PABP34 contain RRM domains and 2, and RRM domains and 4, respectively (Fig 3) The Fig Detection of an AU-binding protein by UV crosslinking assay and identification as ... 5¢-TAATACGACTCACTATAGG-3¢ (universal upper strand) and 5¢- CT(25)CCTATAGTGAGTCGT ATTA-3¢ (sequence specific lower strand for A25) direct transcription of the A25 sequence when annealed and used as a template in the ... mutated to Val and Asp, respectively The recombinant His6-tagged mutant proteins were purified and their affinity for oligo(A), AU-rich and mixed sequence RNA was measured by REMSA and compared to...

Ngày tải lên: 23/03/2014, 12:20

Ngày tải lên: 18/06/2015, 18:51

... cm-1 and ~ 3000 cm-1)30, and may interact with the UC active surface ions of UC nanoparticles, leading to undesirable non-radiative losses and decrease of the UC emission.25,31,32 The ratio of surface- to-bulk ... bioimaging and drug delivery These nanoshells have even a larger number of surface atoms than their solid counterparts due to their inner and outer surfaces Hence, UC nanoshells may be a good candidate ... Synthesis and characterization of NaYF4:Yb,Er nanoshells and the effects of surface and surface coatings on the UC fluorescence Synthesis and characterization of Au-Ag metallic nanoshells The transformation...

Ngày tải lên: 10/09/2015, 09:08

... layer and UC nanoshell layer was controlled by the thickness of silica film The assemblies with different surface coverage % of Au-Ag nanoshell layer were also prepared The surface coverage- and ... (chamber pressure), and 50 standard cubic centimeter per minute (sccm) (Ar flow rate) The silica deposition rate was calibrated using surface profiler (KLA Tencor Alpha-Step Q) The glass and silica have ... emitted from the sample surface due to excitation by the 34    primary electron beam The SEM can produce high-resolution images of the sample surface In this thesis, the surface morphology of the samples...

Ngày tải lên: 10/09/2015, 09:08

... nanoparticles and solid NaYF4 core/UC shell nanoparticles with same crystal structure and similar size were synthesized Figure 3.4a-c shows the XRD and TEM images of the as-synthesized solid UC ... explained by surface effects, which discussed in the following sections 3.4 Effects of surface Assuming a spherical microstructure, the UC active surface area and the UC active volume-normalized surface ... number of UC active surface ions due to their inner and outer surfaces These UC active surface ions would interact with high phonon energy environments such as oleylamine and hexane, leading...

Ngày tải lên: 10/09/2015, 09:09

... wavelength 57    4.3 Microstructure and surface morphology Au-Ag nanoshells were synthesized via galvanic replacement reaction between the as-synthesized Ag nanoparticles and HAuCl4 solution To study ... HAuCl4 The scale bars in the images (a – h) are 20 nm     The surface morphology and surface area were studied using SEM and BET surface area analysis, respectively Figure 4.6 shows the SEM images ... nanoparticles, the entire surface was commonly covered by {111} facets,101,102 which is the densest and lowest 56    surface energy fcc facet The average size (estimated by random measurements of...

Ngày tải lên: 10/09/2015, 09:09

... silica film thickness and the surface coverage % of the Au-Ag nanoshells The local field enhancement and photothermal effects of Au-Ag nanoshells on the surface coverage- and distance-dependent ... at low surface coverage % (region I), indicating the UC fluorescence enhancement The RFF increased with increasing the Au-Ag surface coverage % and reached a maximum value of ~2.5 at surface ... described as follows The boundary condition for X and Y axis (parallel to the surface of glass substrate) was periodic and the Z axis (perpendicular to the surface of glass substrate) was open The plane...

Ngày tải lên: 10/09/2015, 09:09

... host and investigation on the distribution of Yb and Er ions in NaYF4 host The UC nanoshells had the interior cavity ~7 nm and shell thickness ~4 nm, making it a good object to study the surface ... Au-Ag surface coverage lower than 22%, the total UC emission intensity increased with the surface coverage % due to the increase of local field intensity enhancement However, when the surface ... from Au-Ag nanoshells to UC nanoshells and the surface coverage % of Au-Ag nanoshell layer 104    6.2 Recommendations for future study This work showed the surface effects of UC nanoshells significantly...

Ngày tải lên: 10/09/2015, 09:09

... limiting threshold and high optical damage threshold and stability, leading to a large dynamic range, sensitive broadband response to long and short pulses, fast response time, and high lineartransmittance, ... laser the metal particle itself will expand by melting/vaporization of surface atoms and the expanded particles act as another type of scattering center and limit the light transmission during ... previously and these nanoparticles show strong broad band optical limiting effects for nanosecond laser pulses at 532 and 1064 nm and femtosecond laser pulses at 780 nm.6 1.1.4 Saturable Absorption and...

Ngày tải lên: 30/09/2015, 10:11

... constants of Au and Ag (namely, Au: 4.0786 Å and Ag: 4.0862 Å) The TEM image and size distribution (Fig.5) show Au-NPs are rather spherical in shape with average diameter of 17.1 nm and size ranging ... 2θ = 38.1o; 44.4o and 64.4o corresponding to diffraction from the (111), (200) and (220) planes respectively of a face centered cubic structure of Ag crystal TEM image and size distribution of ... (2015) 14-21 Fig.3 TEM image and size distribution of Ag NPs prepared in distilled water Fig.4 UV-Vis absorption spectrum of colloidal Au NPs Fig.5 TEM image and size distribution of Au NPs prepared...

Ngày tải lên: 24/10/2016, 15:21

... stratification In the first phase, a random sample of points was located on aerial photographs and was classified by land cover and forest type In the second phase, a random subsample of the photo points ... located on the ground, and established as a field plot For each field plot, a number of variables were recorded, including current land use, previous land use, stand age, and plantation vs natural ... land surface belonging to each of the different classes of land-use and forest type Both parts of this procedure are included in the results we present here; thus for example, VOC emissions and...

Ngày tải lên: 14/02/2014, 08:20

... scattering (DLS), analytical ultracentrifugation and size exclusion chromatography (SEC) to examine some properties of these complexes, such as their size and stoichiometry Hsp27-3D is especially useful ... were cooled and subjected to ultracentrifugation, and protein composition of supernatants was analyzed by SDS ⁄ PAGE (B) Lanes and represent control unheated F-actin (0.5 mgÆmL)1) and Hsp27-3D ... subjected to heating up to 68 °C and ultracentrifugation Lanes 3–5: F-actin in the presence of 1.0, 0.5 and 0.25 mgÆmL)1 Hsp27-3D, respectively Lanes and 7: F-actin alone and Hsp27-3D alone (0.5 mgÆmL)1),...

Ngày tải lên: 16/03/2014, 06:20

... found on the surface of the enzyme molecule and are formed by the Glu139 side-chain and backbone oxygens and the Val150 backbone oxygen [23] (Fig 3) We ruled out the involvement of type and type ... conditions and could be characterized by c½, the Cd2+ concentration corresponding to half the maximum A440 (Fig 2) The value of c½ was determined manually and found to be 1.20 ± 0.06 mM under the standard ... by testing the effects of Mg2+ and Mn2+ Both of these divalent cations bind to type and sites, with dissociation constants ranging from 0.076 to 6.6 mM for Mg2+ and from 0.006 to 0.35 mM for Mn2+...

Ngày tải lên: 23/03/2014, 13:20

... Obesity and insulin resistance, which are both conditions associated with and determined by excess lipids, play important roles in the development and progression of NAFLD [12,13] Notably, insulin and ... palmitate and adiponectin are unable to influence the expression of Bcl-2, cIAP2 and the IAP family Bcl-2 proteins play important roles in caspase-dependent apoptosis, and the IAP family, cIAP2 and ... Bcl-2, cIAP2 and XIAP in HepG2 cells in the presence and absence of adiponectin Thapsigargin and palmitate, as well as adiponectin, were unable to affect the expression of Bcl-2, cIAP2 and XIAP (Fig...

Ngày tải lên: 29/03/2014, 23:20

... the standard Isolation and sequencing of cDNA clones Salivary glands of T infestans were dissected from thoraces of unfed adults, and poly A(+) RNA was isolated from 30 pairs of salivary glands ... SDS ⁄ PAGE and western blot analysis indicated that triplatin-1 and -2 are major proteins of T infestans saliva Fig Western blot analysis of triplatin-1 and -2 from the salivary gland of T infestans ... pair of salivary glands, recombinant triplatin-1 and recombinant triplatin-2 were separated by 15% SDS ⁄ PAGE under reducing conditions and stained by Coomassie brilliant blue and immunoblotted...

Ngày tải lên: 30/03/2014, 10:20