Learn the Science Behind Glow Sticks by Making Your Own [DIY]

Learn the Science Behind Glow Sticks by Making Your Own [DIY]: "

It doesn't matter how old you are, glow sticks are always cool, and the science behind them is even cooler. DIY web site Instructables show us how to make our own. More »

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Template-Free and Direct Electrochemical Deposition of Hierarchical Dendritic Gold Microstructures: Growth and Their Multiple Applications

Template-Free and Direct Electrochemical Deposition of Hierarchical Dendritic Gold Microstructures: Growth and Their Multiple Applications: "The Journal of Physical Chemistry C, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable)."

Improved Photoluminescence of MnS/ZnS Core/Shell Nanocrystals by Controlling Diffusion of Mn Ions into the ZnS Shell

Improved Photoluminescence of MnS/ZnS Core/Shell Nanocrystals by Controlling Diffusion of Mn Ions into the ZnS Shell: "The Journal of Physical Chemistry C, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable)."

SERS-Active Gold Lace Nanoshells with Built-in Hotspots

SERS-Active Gold Lace Nanoshells with Built-in Hotspots: "Nano Letters, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable)."

Thermal and optical properties of tellurite glasses doped erbium

Thermal and optical properties of tellurite glasses doped erbium: "

Abstract  

Er³⁺-doped tellurite glasses with molar compositions of 75TeO₂–20ZnO–(5 − x) Na₂O–xEr₂O₃ (x = 0, 0.5, 1, 2, 3, and 4 mol%) have been elaborated from the melt-quenching method. The effects of Er₂O₃ concentration on the thermal stability and optical properties of tellurite glasses have been discussed. From the differential
scanning calorimetry (DSC) profile, the glass transition temperature T
_g, and crystallization onset temperature T
_x are estimated. The thermal stability factor, defined as ∆T = T
_x − T
_g, was higher than 100 °C. It suggests that tellurite glass exhibits a good thermal stability and consequently is suitable
to be a potential candidate for fiber drawing. Furthermore, the stability factor increases with Er₂O₃ concentration up to 2 mol% then presents a continue decrease suggesting of beginning of crystallization of highly doped tellurite
glasses. The refractive index and extinction coefficient data were obtained by analyzing the experimental spectra of tanΨ
and cos∆ measured by spectroscopic ellipsometry (SE). The complex dielectric functions (ε = ε₁ + iε₂) of the samples were estimated from regression analysis. The fundamental absorption edge has been identified from the optical
absorption spectra and was analyzed in terms of the theory proposed by Davis and Mott. The values of optical band gap for
direct and indirect allowed transitions have been determined. An important decrease of the optical band gap was found after
Er doping. It was assigned to structural changes induced from the formation of non-bridging oxygen. The absorption coefficient
just below the absorption edge varies exponentially with photon energy indicating the presence of Urbach’s tail. The origin
of the Urbach energy is associated with the phonon-assisted indirect transitions.

• Content Type Journal Article
• DOI 10.1007/s10853-010-4820-x
• Authors
  • I. Jlassi, Laboratoire de Physico-Chimie des Matériaux Minéraux et leurs Applications, Centre National de Recherches en Sciences des Matériaux, B.P. 95, Hammam-Lif, 2050 Tunisia
  • H. Elhouichet, Laboratoire de Physico-Chimie des Matériaux Minéraux et leurs Applications, Centre National de Recherches en Sciences des Matériaux, B.P. 95, Hammam-Lif, 2050 Tunisia
  • M. Ferid, Laboratoire de Physico-Chimie des Matériaux Minéraux et leurs Applications, Centre National de Recherches en Sciences des Matériaux, B.P. 95, Hammam-Lif, 2050 Tunisia

• Journal Journal of Materials Science
• Online ISSN 1573-4803
• Print ISSN 0022-2461

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A green method for synthesis of silver nanodendrites

A green method for synthesis of silver nanodendrites: "

Abstract  

A simple, green method was developed for the synthesis of silver nanodendrites by an aqueous chemical route. This method involves
the reduction of silver nitrate with absolute alcohol using polyvinyl pyrrolidone (PVP) as the surfactant. UV–vis absorption
spectra, X-ray diffraction patterns (XRD) and energy dispersive spectrometry (EDS) suggest the formation of Ag nanoparticles.
Transmission electron microscopy (TEM) images show the shape and sizes of the nanoparticles. During the synthesis, it was
found that the morphology and size distribution of the as-prepared silver nanoparticles varied with the concentration of the
precursor metal salts, reaction time and surfactant ratios. The formation mechanism of Ag nanodendrites was determined based
on the investigation of the above reaction parameters. Simple methods, nontoxic chemicals and environmentally benign solvents
make this synthesis ideally suited for industrial production.

• Content Type Journal Article
• DOI 10.1007/s10853-010-4826-4
• Authors
  • Lei Sun, Key Laboratory for Special Functional Materials of Ministry of Education, Henan University, Kaifeng, 475004 People’s Republic of China
  • Aixin Liu, Key Laboratory for Special Functional Materials of Ministry of Education, Henan University, Kaifeng, 475004 People’s Republic of China
  • Xiaojun Tao, Key Laboratory for Special Functional Materials of Ministry of Education, Henan University, Kaifeng, 475004 People’s Republic of China
  • Yanbao Zhao, Key Laboratory for Special Functional Materials of Ministry of Education, Henan University, Kaifeng, 475004 People’s Republic of China

• Journal Journal of Materials Science
• Online ISSN 1573-4803
• Print ISSN 0022-2461

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Photomediated Synthesis of Silver Triangular Bipyramids and Prisms: The Effect of pH and BSPP

Photomediated Synthesis of Silver Triangular Bipyramids and Prisms: The Effect of pH and BSPP: "Journal of the American Chemical Society, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable)."

Super-resolution Optical Imaging of Single-Molecule SERS Hot Spots

Super-resolution Optical Imaging of Single-Molecule SERS Hot Spots: "Nano Letters, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable)."

Fluorescence Intermittency and Energy Transfer in Small Clusters of Semiconductor Quantum Dots

Fluorescence Intermittency and Energy Transfer in Small Clusters of Semiconductor Quantum Dots: "The Journal of Physical Chemistry C, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable)."

One-Pot Radiolytic Synthesis of Gold Nanorods and Their Optical Properties

One-Pot Radiolytic Synthesis of Gold Nanorods and Their Optical Properties: "The Journal of Physical Chemistry C, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable)."

Influence of Size, Shape, and Surface Coating on the Stability of Aqueous Suspensions of CdSe Nanoparticles

Influence of Size, Shape, and Surface Coating on the Stability of Aqueous Suspensions of CdSe Nanoparticles: "Chemistry of Materials, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable)."

Dipicolinate Sensitization of Europium Luminescence in Dispersible 5%Eu:LaF3 Nanoparticles

Dipicolinate Sensitization of Europium Luminescence in Dispersible 5%Eu:LaF3 Nanoparticles: "The Journal of Physical Chemistry C, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable)."

A “Neck-Formation” Strategy for an Antiquenching Magnetic/Upconversion Fluorescent Bimodal Cancer Probe

A “Neck-Formation” Strategy for an Antiquenching Magnetic/Upconversion Fluorescent Bimodal Cancer Probe: "

Up to the neck! Bio-safe upconversion fluorescent nanocrystals (NaYF₄: Er,Yb) and biocompatible superparamagnetic iron oxide nanocrystals (SPION) were effectively combined by means of a general “neck-formation” strategy, forming a size-controlled, Cd²⁺- and Gd³⁺-free, silica-shielded, magnetic upconversion fluorescent oligomer (SMUFO), bimodal cancer probe that offers high resistance to photoquenching as well as a synergistic T₂-weighted magnetic resonance enhanced effect (see graphic).

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Color-Tunable Nanophosphors by Codoping Flame-Made Y2O3 with Tb and Eu†

Color-Tunable Nanophosphors by Codoping Flame-Made Y2O3 with Tb and Eu†: "The Journal of Physical Chemistry C, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable)."

Ranking of As-Received Micro/Nanoparticles by their Surface Energy Values at Ambient Conditions

Ranking of As-Received Micro/Nanoparticles by their Surface Energy Values at Ambient Conditions: "The Journal of Physical Chemistry C, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable)."

“Naked” Gold Nanoparticles: Synthesis, Characterization, Catalytic Hydrogen Evolution, and SERS

“Naked” Gold Nanoparticles: Synthesis, Characterization, Catalytic Hydrogen Evolution, and SERS: "The Journal of Physical Chemistry C, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable)."

Tunable Dual Emission in Doped Semiconductor Nanocrystals

Tunable Dual Emission in Doped Semiconductor Nanocrystals: "Nano Letters, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable)."

One-Step Preparation of Strongly Luminescent and Highly Loaded CdSe Quantum Dot−Silica Films

One-Step Preparation of Strongly Luminescent and Highly Loaded CdSe Quantum Dot−Silica Films: "The Journal of Physical Chemistry C, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable)."

Printable Nanoporous Silver Membranes

Printable Nanoporous Silver Membranes: "Chemistry of Materials, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable)."

Alternative Incorporation Procedure of Quantum Dots in Polymer Microspheres

Alternative Incorporation Procedure of Quantum Dots in Polymer Microspheres: "Chemistry of Materials, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable)."