Silica-coated Gold Nanoparticles: Surface Chemistry, …
Silica-coated particles are thermodynamically stable (they resist shape change) for fluences up to 20 mJ/cm2. In addition to thermodynamic stability (resisting melting) and colloidal stability, silica coating of gold nanorods imparts other notable properties and …
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Preparation of monodispersed silica particles coated with …
The phase composition of silica core and the coated particles was investigated by XRD. Fig. 3 shows the XRD patterns of the pure silica and the coated particles obtained by 1.0 ml ceria precursor at pH 6.8. The major reflections associated with fluorite structure of ceria coating can be observed from curve (b) in Fig. 3.The XRD …
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Physicochemical and biological characterization of silica-coated …
A tribochemical silica-coating (TSC) method has been developed to improve the adhesion of dental resin composites to various substrates. The method utilizes airborne-particle abrasion using particles having a silica surface and an alumina core. The impact of the TSC method has been extensively studied but less attention has been paid to the ...
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Polyurethane-coated silica particles with broad-spectrum …
The surface-to-end-group attachment mode after post-quaternization, in particular, produced PU-PEG-coated silica particles with excellent antibacterial potency against S. aureus and E. coli at a low particle concentration of 10 and 40 mg mL −1, respectively. By using the same batch of particles in repeated applications, it was found that the ...
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Silica Nanoparticles | SpringerLink
In addition to pure silica particles, the reverse micelle method can be used to prepare dye-doped metal NPs having a magnetic or semiconductor quantum dot core. ... The coated silica layer guided the overgrowth of metals (Au, Ag, Pd, and Pt) on the exposed gold surface. In addition, in the case of gold nanorod particles, not only the …
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Density gradients prepared from colloidal silica particles coated …
Density gradients prepared from colloidal silica particles coated by polyvinylpyrrolidone (Percoll) Density gradients prepared from colloidal silica particles coated by polyvinylpyrrolidone (Percoll) Anal Biochem. 1978 Jul 15;88 (1):271-82. doi: 10.1016/0003-2697 (78)90419-0.
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(PDF) Structural and Tailored Optical Properties of Gold Coated Silica …
After coating silica particles with gold, the intensity of Si–O–Si and Si– OH peaks was reduced significantly. This indicated the presence of gold shell in silica nanoparticles. Conclusion Nearly monodispersed spherical core-shell SiO2@Au nanoparticles were synthesized successfully, using citrate reduction method to coat gold nanoparticles.
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A Comprehensive Review of Synthesis, Applications and …
Silica nanoparticles (SNPs) have shown great applicability potential in a number of fields like chemical, biomedical, biotechnology, agriculture, environmental remediation and even wastewater purification. With remarkably instinctive properties like mesoporous structure, high surface area, tunable pore size/diameter, biocompatibility, …
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Synthesis and characterization of titania-coated silica fine particles …
TiO 2 particles were coated on the monodispersed spherical silica particles prepared in this experiment and the procedure is shown in Fig. 1 (b). The silica particles with 250 nm in mean particle size were sonicated in 100 ml of ethanol for 20 min and then, 0.3 M of H 2 O–ethanol solution was mixed.
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Composites Part A: Applied Science and Manufacturing
The silica particles coated onto the coupons serve as a barrier, preventing the stress from propagating into the CFRP or Al components. These simulation results are consistent with the SEM analysis outcomes and the fractographic schematics illustrated in Fig. 6. The silica particles cause fractures to occur inside the adhesive or at the ...
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Polymer/Silica Nanocomposites: Preparation, …
Polypeptide-Coated Silica Particles Dispersed in Lyotropic Liquid Crystals of the Same Polypeptide. The Journal of Physical Chemistry B 2016, 120 (29), 7275-7288.
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Preparation of ultrafine silica- and PEG-coated magnetite particles
The effect of varying the reaction temperature was investigated. Thus, magnetite was coated with SiPEG 5000 at room temperature, 50 and 80°C, respectively. Particle size and electrophoresis data for these systems are shown in Fig. 3 a–c, respectively. The particles coated at room temperature were scarcely more stable than …
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Current status of silica-based nanoparticles as therapeutics …
2. Structure of silica. Silica nanoparticles are highly ordered, crystalline particles made of silicon dioxide (SiO 2).The surface consists of siloxane structures and silanol groups which are easily conjugatable to many biological molecules to suit the intended application (Guzman and Gates, 2003; Bagheri et al., 2018).There are 2 main …
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Simple synthesis of gold-decorated silica nanoparticles by …
We describe a simple method for the preparation of gold-decorated silica (SiO2) nanoparticles (NPs) by the in situ precipitation method using simple BH4− ions reduction as a procedure, where BH4− ions are adsorbed onto PEI-functionalized SiO2 NPs for stabilizing and reducing gold ions onto PEI-SiO2 surface in water under ambient …
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pH-Responsive Silica Coatings: A Generic Approach …
The silica coating of nanoparticles and of complex bioentities such as viruses has gathered significant scientific interest due to the versatility of silica-based materials. These nanostructured core–shell architectures …
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Silane-coated silica particle colloid processing of human …
Purpose: The purpose of this study was to determine differences in the quality of human sperm processed through different lots of silane-coated silica particle colloid solutions. The objectives were to compare (a) sperm kinematic parameters, (b) the sperm acrosome status, (c) the membrane integrity of the head and tail regions, (d) the DNA normality, …
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A Composite of Polyether Ether Ketone and Silica‐Coated …
The silica shell thickness was measured at different parts of a particle and on different particles at the edge of coated and uncoated areas. The received average shell thicknesses were correlated with the silicon copper ratio determined by EDX analysis of the examined samples.
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Biofunctionalization of silica-coated magnetic particles mediated …
A linker peptide sequence with affinity to silica-containing materials was fused to Streptococcus protein G', an antibody-binding protein. This recombinant fusion protein, linker-protein G (LPG) was produced in E. coli and exhibited strong affinity to silica-coated magnetic particles and was able to bind to them at different pHs, indicating a …
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Chemical mechanical polishing of thermal oxide films using silica …
Thermal oxide covered silicon wafers were polished with slurries containing either nano-sized ceria (CeO2) or newly prepared uniform colloidal silica particles coated with ceria. The polish rate of the latter was significantly higher than that of pure ceria. The experiments were carried out using different concentrations of the abrasives at pH 4 and …
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Silica-coated superparamagnetic iron oxide nanoparticles: …
Silica-coated iron oxide nanoparticles are of enormous importance in biotechnology, nanomedicine, and catalysis. The study demonstrates the significant influence of the coating thickness on the particle properties. Though slow magnetophoresis, a thinner shell leads to higher surface areas, lower isoelectric points, and higher magnetizations. …
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IJMS | Free Full-Text | Synthesis and Application of …
The silica-coated package material for the encapsulation of water-insoluble QDs allowed the particles to bioconjugate and enhanced the stability of liposomes against fusion and internal leakage during …
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Hydrophobic plasma polymer coated silica particles for …
In recent years, functionalized hydrophobic materials have attracted considerable interest as oil removal agents. This investigation has applied plasma polymerization as a novel method to develop hydrophobic and oleophilic particles for water purification. 1,7-Octadiene was plasma polymerized onto silica particles using a radio …
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Surface Modification of Silica Particles with Adhesive …
Silica particles coated with chitosan adhere to mucosal surfaces predominantly due to electrostatic interactions, whereas other functionalized particles are capable of forming covalent linkages with some functional groups present in mucins. Thiolated, acryloylated, and maleimide-functionalized silica form covalent bonds with thiol groups ...
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Preparation of monodispersed silica particles coated with …
@article{Oh2010PreparationOM, title={Preparation of monodispersed silica particles coated with ceria and control of coating thickness using sol-type precursor}, author={Myoung Hwan Oh and Jaeseok Lee and Sushant Gupta and Feng-Chih Chang and Rajiv Kumar Singh}, journal={Colloids and Surfaces A: Physicochemical and Engineering …
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Covalent functionalized silica-coated magnetic …
Silica-coated magnetic nanoparticles decoration with other synthetic polymer. Polymer functionalized silica-coated MNPs are promising candidates for a broad range …
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Sodium silicate route to coat polymer particles with silica
The coating of colloidal particles with material of different chemical composition modifies their surface properties. Such core–shell particles can often be prepared by controlled precipitation of inorganic precursors onto the core particles [].Among the coating materials, silica (SiO 2) is a very interesting candidate as it can be …
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Hollow Silica Particles: Recent Progress and Future …
Hollow silica particles (or mesoporous hollow silica particles) are sought after for applications across several fields, including drug delivery, battery anodes, catalysis, thermal insulation, and functional coatings. Significant progress has been made in hollow silica particle synthesis and several new methods are being explored to use these ...
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Controlling Superhydrophobicity and Oleophobicity of
The prepared PDMS-coated silica hybrid particles with long PDMS chains exhibited a water contact angle of 151.2° and an oil contact angle of 15.2° due to the rough surface morphology and hydrophobic long-chain effects. Furthermore, the resulting organic–inorganic hybrid particles were thermally stable up to 420 °C. This controlled …
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Electrorheology of polyaniline-coated silica particles …
The electrorheology of silica particles coated with protonated polyaniline or polyaniline base in silicone oil has been studied. The behaviour of suspensions has been compared with those of bare silica particles and polyaniline base powder. For a 1 wt.% suspension of polyaniline base, the low-shear viscosity (at 7.69 s−1) increased more …
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Fluorescently Labelled Silica Coated Gold Nanoparticles as …
After polyvinylpyrrolidone (PVP) functionalization 29, the particles were transferred to ethanol and coated with a very thin non fluorescent silica layer using a seeded growth procedure based on ...
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