Chemistry of Aqueous Silica Nanoparticle Surfaces and the Mechanism of Selective Peptide Adsorption

2012 ◽  
Vol 134 (14) ◽  
pp. 6244-6256 ◽  
Author(s):  
Siddharth V. Patwardhan ◽  
Fateme S. Emami ◽  
Rajiv J. Berry ◽  
Sharon E. Jones ◽  
Rajesh. R. Naik ◽  
...  
Keyword(s):  
Silica Nanoparticle ◽  
Peptide Adsorption ◽  
Aqueous Silica

Controlling aqueous silica nanoparticle synthesis in the 10–100 nm range

2015 ◽  
Vol 51 (98) ◽  
pp. 17420-17423 ◽  
Author(s):  
Delyan R. Hristov ◽  
Eugene Mahon ◽  
Kenneth A. Dawson
Keyword(s):  
Nanoparticle Synthesis ◽  
Silica Nanoparticle ◽  
Single Step ◽  
Generation Rate ◽  
Nm Range ◽  
Aqueous Silica

Controlling monomer generation rate in different ways, we broaden the range of sizes attainable for single step aqueous silica nanoparticle synthesis.

Experimental evaluation of additional short ranged repulsion in structural oscillation forces

Soft Matter ◽  
2018 ◽  
Vol 14 (26) ◽  
pp. 5383-5392 ◽  
Author(s):  
Sebastian Schön ◽  
Regine von Klitzing
Keyword(s):  
Ionic Strength ◽  
Double Layer ◽  
Experimental Evaluation ◽  
Silica Nanoparticle ◽  
Nanoparticle Suspensions ◽  
Low Ionic Strength ◽  
Aqueous Silica

Identification of positive synergy at low ionic strength between structural oscillation and double layer forces in confined aqueous silica nanoparticle suspensions.

Stability of aqueous silica nanoparticle dispersions

2010 ◽  
Vol 13 (2) ◽  
pp. 839-850 ◽  
Author(s):  
Cigdem O. Metin ◽  
Larry W. Lake ◽  
Caetano R. Miranda ◽  
Quoc P. Nguyen
Keyword(s):  
Silica Nanoparticle ◽  
Nanoparticle Dispersions ◽  
Aqueous Silica

Improved Tribological Performance of Polydopamine/Polytetrafluoroethylene Thin Coatings With Silica Nanoparticles Incorporated into the Polydopamine Underlayer

2021 ◽  
Vol 143 (11) ◽  
Author(s):  
Adedoyin Abe ◽  
Dipankar Choudhury ◽  
Min Zou
Keyword(s):  
Solid Lubricant ◽  
Silica Nanoparticle ◽  
Low Friction ◽  
Contact Conditions ◽  
Dry Contact ◽  
Delamination Resistance ◽  
Coating Durability ◽  
Steel Substrates ◽  
Increasing Load ◽  
Aqueous Silica

Abstract Polytetrafluoroethylene (PTFE) is a solid lubricant with low friction coefficient. However, it lacks durability as a thin coating. Prior studies have shown that a polydopamine (PDA) underlayer enhances the coating durability. In this study, 100, 200, and 300 µL of aqueous silica nanoparticle (NP) dispersions were added to a 15 mL PDA deposition solution. Stainless steel substrates were coated with PDA + silica in the mixed dispersions and then coated with PTFE layers to form thin PDA + silica/PTFE coatings. The coatings were tested in ball-on-flat linear reciprocating motion under dry contact conditions. The durability of the PDA/PTFE coating was improved by 70% when 100 µL of aqueous silica NP dispersion was added. The significant improvement in the durability was attributed to the increased adhesion of the PTFE coating to the PDA underlayer, the fragmented wear debris, and the enhanced counterface transfer film. These samples also showed enhanced resistance under linearly increasing load scratch testing with lower coefficient of friction (COF) and higher delamination resistance when compared to samples without silica.

scholarly journals Development of a Polyacrylate/Silica Nanoparticle Hybrid Emulsion for Delaying Nutrient Release in Coated Controlled-Release Urea

Coatings ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 88 ◽  
Author(s):  
Yazhen Shen ◽  
Jianmin Zhou ◽  
Changwen Du
Keyword(s):  
Controlled Release ◽  
Silica Nanoparticles ◽  
Water Vapor Permeability ◽  
Nutrient Release ◽  
Silica Nanoparticle ◽  
Vapor Permeability ◽  
Polymer Emulsion ◽  
Urea Granules ◽  
Controlled Release Fertilizers ◽  
Aqueous Silica

Polyacrylate/silica hybrid emulsions were prepared by blending aqueous silica nanoparticles with polyacrylate emulsion, which were used for coating urea granules. After incorporating 1.0 wt.% silica nanoparticles into polyacrylate emulsion, preliminary solubility of CRU was decreased from 38.3% to 2.2%, and the release duration was extended from 8 to 27 days. The hybrid coating remarkably delayed the release of urea via improving wear-resistance due to the enhanced hardness, reducing water vapor permeability because of the tortuous diffusion pathway, and less breakage of CRU granules resulted from higher glass transition temperature. Meanwhile, the processibility was improved, which prevented particle agglomeration during coating. Therefore, aqueous silica nanoparticles have potential application in polymer emulsion coated controlled-release fertilizers.

Molecular dynamics studies of aqueous silica nanoparticle dispersions: salt effects on the double layer formation

2015 ◽  
Vol 27 (32) ◽  
pp. 325101 ◽  
Author(s):  
Lucas S de Lara ◽  
Vagner A Rigo ◽  
Mateus F Michelon ◽  
Cigdem O Metin ◽  
Quoc P Nguyen ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Double Layer ◽  
Silica Nanoparticle ◽  
Layer Formation ◽  
Salt Effects ◽  
Nanoparticle Dispersions ◽  
Aqueous Silica

Application of Silica Nanoparticles in the Determination of Herbicides in Environmental Water Samples Using Liquid Chromatography-Mass Spectroscopy

2020 ◽  
Vol 16 (5) ◽  
pp. 748-756
Author(s):  
Mir Waqas Alam ◽  
Tentu Nageswara Rao ◽  
Yarasani Prashanthi ◽  
Vourse Sridhar ◽  
Adil Alshoaibi ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Liquid Chromatography ◽  
Silica Nanoparticles ◽  
Solid Phase ◽  
Silica Nanoparticle ◽  
Environmental Water ◽  
Phase Extraction ◽  
Functionalized Nanoparticles ◽  
Supporting Material

Background: Herbicides are very beneficial in the crop yield with the aid of controlling weeds within the agriculture, but several herbicides are chronic in soil. Objective: In this study, nanoparticles and the packages of synthesized novel silica nanoparticles were studied for the preconcentration of herbicides. Methods: These nanoparticles prepared by the Stöber mechanism were purified and functionalized. Nanoparticles thus prepared successfully were used as supporting material for the preconcentration of residues of herbicides in the water. Results: Preconcentration was achieved by preparing the silica-based solid-phase-extraction cartridges. Nanoparticles used for this purpose were within the range of 50-250 nm. An SPE cartridge was prepared by packing 200 mg of silica nanoparticle in the empty cartridge of diameter 5.5 cm and length 0.6 cm in between PTFE frits. Aqueous solutions of 0.1 μg/ml of herbicides were prepared separately, and 10 ml of the solution was passed through the cartridge at the rate of 0.2 ml/min. After passing 10 ml volume of the aqueous solution, residues adsorbed on the cartridge were eluted using 2 ml of acetonitrile. The eluate was injected to determine the herbicide residue adsorbed on the SPE cartridge. Conclusion: In the study, it was found that greater than 90% of the herbicide residues were trapped on silica nanoparticle-based SPE cartridge. An analytical method was developed for the simultaneous determination of these herbicides. The residues were quantified by LC-MS/MS with ESI mode.

Mesoporous Silica Nanoparticles of Hydroxyurea: Potential

2020 ◽  
Vol 10 ◽  
Author(s):  
Kumar Nishchaya ◽  
Swatantra K.S. Kushwaha ◽  
Awani Kumar Rai
Keyword(s):  
Drug Release ◽  
Silica Nanoparticles ◽  
Mesoporous Silica Nanoparticles ◽  
Release Kinetics ◽  
Average Particle Size ◽  
Silica Nanoparticle ◽  
Average Particle ◽  
Independent Variables ◽  
Lower Temperature

Background: Present malignant cancer medicines has the advancement of magnetic nanoparticles as delivery carriers to magnetically accumulate anticancer medication in malignant growth tissue. Aim: In the present investigation, a silica nanoparticles (MSNs) stacked with hydroxyurea were combined and was optimized for dependent and independent variables. Method: In this study, microporous silica nanoparticle stacked with neoplastic medication had been prepared through emulsification followed with solvent evaporation method. Prepared MSNs were optimized for dependent and independent variables. Different formulations were prepared with varying ratio of polymer, lipid and surfactant which affects drug release and kinetics of drug release pattern. The obtained MSNs were identified by FTIR, SEM, drug entrapment, in-vitro drug release, drug release kinetics study, stability testing in order to investigate the nanoparticle characteristics. Results: The percentage drug entrapment of the drug for the formulations F1, F2, F3, was found to be 27.78%, 65.52% and 48.26%. The average particle size for F2 formulation was found to be 520 nm through SEM. The cumulative drug release for the formulations F1, F2, F3 was found to be 64.17%, 71.82% and 32.68%. The formulations were found to be stable which gives controlled drug delivery for 6 hours. Conclusion: From the stability studies data it can be culminated that formulations are most stable when stored at lower temperature or in refrigerator i.e. 5˚C ± 3˚C. It can be concluded that MSN’s loaded with hydroxyurea is a promising approach towards the management of cancer due to its sustained release and less side effects.

scholarly journals Silica nanoparticle supported lipid bilayers for gene delivery

2009 ◽  
pp. 5100 ◽  
Author(s):  
Juewen Liu ◽  
Alison Stace-Naughton ◽  
C. Jeffrey Brinker
Keyword(s):  
Gene Delivery ◽  
Lipid Bilayers ◽  
Silica Nanoparticle ◽  
Supported Lipid Bilayers
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