نتایج جستجو برای: silica coating
تعداد نتایج: 72887 فیلتر نتایج به سال:
Coral Pt islands films are deposited via electrochemical reduction on silica-coated nanostructured Ag electrodes. From these devices surface-enhanced (resonance) Raman [SE(R)R] signals of molecules exclusively attached to Pt are obtained with intensity up to 50% of the value determined for Ag. SE(R)R spectroscopic investigations are carried out with different probe molecules, silica-coating thi...
The upconversion luminescence UCL of the hexagonal -phase NaYF4:Yb,Er nanophosphors as a function of temperature 300–450 K was examined under 978 nm light excitation. The thermal sensitivity was evaluated based on the UCL intensity ratio between H11/2– I15/2 and S3/2– I15/2 transitions RHS . Excitation power, particle sizes 37, 65, and 140 nm , ion doping concentrations, and with and without si...
PTFE-based coatings have been widely used, for example, on aluminium moulds for moulding of polyolefin packaging materials for its non-stick property. However, these coatings do not meet the users’ scratch resistance and durability requirements. This paper describes a preliminary study on the synthesis and characterization of a PTFE/sol-gel composite coating material which combines the required...
....................................................................................................................................7 POPULÄRVETENSKAPLIG SAMMANFATTNING...................................................................9 LIST OF PAPERS........................................................................................................................ 11 MY CONTRIBUTIONS TO IN...
Single silica capped and uncapped gold nanoparticles are imaged using apertureless near-field optical microscopy (ANSOM) in the infrared frequency range (λ=9-11 μm). While visible frequency imaging can only allow identification of capped and uncapped particles, IR nearfield imaging also permits spectroscopic resolved imaging through vibrational resonances. Optical phonon resonances of the silic...
We report the synthesis of a new nanocrystal (NC) mesophase through self-assembly of water-soluble NC micelles with soluble silica. The mesophase comprises gold nanocrystals arranged within a silica matrix in a face-centered cubic lattice with cell dimensions that are adjustable through control of the nanocrystal diameter and/or the alkane chain lengths of the primary alkanethiol stabilizing li...
Combined chemo and photothermal therapy in in vitro testing has been achieved by means of multifunctional nanoparticles formed by plasmonic gold nanoclusters with a protecting shell of porous silica that contains an antitumor drug. We propose a therapeutic nanoplatform that associates the optical activity of small gold nanoparticles aggregates with the cytotoxic activity of 20(S)-camptothecin s...
We present the first nanoscale investigation of silica glaze. High resolution transmission electron microscopy of a rock coating from the Ashikule Basin, Tibetan Plateau, reveals the presence of spheroids composed predominantly of silicon and oxygen with diameters ranging from 20 nm to 70 nm. While silica glaze spheroids co-exist with manganese-rich rock varnish in the same sample, the differen...
We report the synthesis of a new nanocrystal (NC) mesophase through self-assembly of water-soluble NCmicelles with soluble silica. The mesophase comprises gold nanocrystals arranged within a silica matrix in a facecentered-cubic lattice with cell dimensions that are adjustable through control of the nanocrystal diameter and/or the alkane chain lengths of the primary alkanethiol stabilizing liga...
In this research, mesoporous silica was served as the host of molybdate (corrosion inhibitor). The loaded mesoporous silica was dispersed in a paint matrix. The composite was then coated on the carbon steel surface. Polarization and electrochemical impedance spectroscopy (EIS) tests showed that the corrosion resistance of the scratched paint containing molybdate loaded mesoporous silica ...
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