scholarly journals Controlled aggregation of core(amorphous silica)@shell(TPA+-polysilicate) nanoparticles at room temperature by selective removal of TPA+ ions from the nanoparticle shell

2019 ◽  
Vol 6 (7) ◽  
pp. 1639-1653 ◽  
Author(s):  
Sanja Bosnar ◽  
Maja Dutour Sikirić ◽  
Vilko Smrečki ◽  
Josip Bronić ◽  
Suzana Šegota ◽  
...  
Keyword(s):  
Amorphous Silica ◽  
Room Temperature ◽  
Silica Shell ◽  
Selective Removal ◽  
Silanol Groups

Displacement of TPA+ ions from the nanoparticle shell exposes the terminal silanol groups, which enables the aggregation of the collided nanoparticles.

scholarly journals Data on the fabrication of hybrid calix [4]arene-modified natural bentonite clay for efficient selective removal of toxic metals from wastewater at room temperature

Data in Brief ◽  
2021 ◽  
Vol 35 ◽  
pp. 106799
Author(s):  
Khouloud Jlassi ◽  
Kamel Eid ◽  
Mostafa H. Sliem ◽  
Aboubakr M. Abdullah ◽  
Mohamed M. Chehimi
Keyword(s):  
Toxic Metals ◽  
Room Temperature ◽  
Bentonite Clay ◽  
Selective Removal

scholarly journals Facile Synthesis of Nanoporous Amorphous Silica on Silicon Substrate

2020 ◽  
Vol 2020 ◽  
pp. 1-6
Author(s):  
Luo Hui ◽  
Huang Yongquan ◽  
Wu Lili ◽  
Ge Yanming ◽  
Huang Kaichen ◽  
...  
Keyword(s):  
Amorphous Silica ◽  
Large Scale ◽  
Room Temperature ◽  
Thermal Evaporation ◽  
Metal Particles ◽  
Nanoporous Structure ◽  
Facile Synthesis ◽  
Ultraviolet Emission ◽  
Key Factor ◽  
Nanoporous Structures

Large-scale nanoporous amorphous silica nanostructure is fabricated via a simply etched approach and effective thermal evaporation process. The nanoporous amorphous silica was synthesized by a general and scalable process via etching by metal particles on the silica sheets. In this study, we elucidated how a nanoporous structure was performed and the addition of indium is the key factor that determined the formation of the nanoporous structures. The morphology and the sizes of the porous structure could be tunable by the sizes and the shape of the metal. We discovered a promising optical property in the as-synthesized nanostructures, which have a photoluminescence in an intensive ultraviolet emission as well as a broad visible emission at room temperature.

Strategic harmonization of silica shell stabilization with Pt embedding on AuNPs for efficient artificial photosynthesis

2020 ◽  
Vol 8 (11) ◽  
pp. 5734-5743 ◽  
Author(s):  
Dinesh Kumar ◽  
Chan Hee Park ◽  
Cheol Sang Kim
Keyword(s):  
Amorphous Silica ◽  
Artificial Photosynthesis ◽  
Pt Nanoparticles ◽  
Silica Shell ◽  
Silica Layer ◽  
Plasmonic Nanostructure

The Pt nanoparticles embedding on AuNPs through amorphous silica layer stabilizing plasmonic nanostructure for efficient CO2 photoreduction.

Synthesis of Core@Shell Composites with Gold Nanoparticles Trapped inside Ceramic Silica Shells by the Sol-Gel Method

2008 ◽  
Vol 368-372 ◽  
pp. 797-799 ◽  
Author(s):  
Chien Jung Huang ◽  
Pin Hsiang Chiu ◽  
Yeong Her Wang
Keyword(s):  
Gold Nanoparticles ◽  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Amorphous Silica ◽  
Plasmon Resonance ◽  
Sol Gel ◽  
Silica Shell ◽  
Core Shell ◽  
Gold Core ◽  
Spherical Gold Nanoparticles

This paper describes a sol-gel (SG) method for the coating of gold nanoparticles with uniform shells of amorphous silica. The thickness of silica could be conveniently controlled in the range of 10 to 120 nm by increasing the amount of water. Although spherical gold nanoparticles generally have a surface plasmon resonance (SPR) at a wavelength of about 520 nm, a spherical gold core with a silica shell offers a very highly tunable SPR wavelength depending on the thickness of the silica shell.

scholarly journals Thermal resilience of ensilicated lysozyme via calorimetric and in vivo analysis

RSC Advances ◽  
2020 ◽  
Vol 10 (50) ◽  
pp. 29789-29796
Author(s):  
A. Doekhie ◽  
M. N. Slade ◽  
L. Cliff ◽  
L. Weaver ◽  
R. Castaing ◽  
...  
Keyword(s):  
Room Temperature ◽  
Sol Gel ◽  
Silica Shell ◽  
Room Temperature Storage ◽  
Sol Gel Process ◽  
In Vivo Analysis ◽  
Novel Method ◽  
Temperature Storage

Ensilication is a novel method of protein thermal stabilisation using silica. It uses a modified sol–gel process which tailor fits a protective silica shell around the protein to enable room temperature storage of biopharmaceuticals.

Über 5-Hydroxymethyl-cytidin und 5-Hydroxymethyl-cytosin-N-3-β-D-glucopyranosid sowie über reaktionsfähige Vorstufen

1966 ◽  
Vol 21 (10) ◽  
pp. 942-952 ◽  
Author(s):  
Reinhard Brossmer ◽  
Erich Röhm
Keyword(s):  
Hydrochloric Acid ◽  
Benzyl Alcohol ◽  
Catalytic Hydrogenation ◽  
Sodium Methoxide ◽  
Room Temperature ◽  
Selective Removal ◽  
Protecting Groups ◽  
Hydroxymethyl Cytosine ◽  
Analogous Manner ◽  
Synthetic Intermediates

5-Benzyloxymethyl-NNH2-benzoyl-cytosine (4) is formed from 5-hydroxymethyl-cytosine (1) in 80% yield by benzylation and subsequent benzoylation. The benzylation readily takes place with benzyl alcohol and catalytic amounts of hydrochloric acid in tetrahydrothiophen-1.1-dioxide as solvent. — 4 is quantitatively converted in pyridine at room temperature to a toluene soluble mercury (II) salt 5.5 condenses easily with 2.3.5-tribenzoyl-D-ribofuranosyl chloride to give the β-nucleoside 6, no a-anomer being found. — The removal of all protecting groups by catalytic hydrogenation and treatment with sodium methoxide or ammonia leads to cristalline 5-hydroxymethyl cytidine 10 (ca. 60% yields based on 1). — In an analogous manner N-3-β-D-glucosyl-5-hydroxymethyl-cytosine 15 is prepared. — Selective removal of certain of the protecting groups in 6 and 11 yields potentially valuable synthetic intermediates.

Microstructural and Thermal Properties of Nanocrystalline Silica Xerogel Powders Converted from Sago Waste Ash Material

2013 ◽  
Vol 737 ◽  
pp. 110-118 ◽  
Author(s):  
Haji Aripin ◽  
Seitaro Mitsudo ◽  
Inyoman Nyoman Sudiana ◽  
Endangsusilowati S. Prima ◽  
Katsuhide Sako ◽  
...  
Keyword(s):  
Amorphous Silica ◽  
Room Temperature ◽  
Xrd Analysis ◽  
Crystalline Silica ◽  
Silica Xerogel ◽  
Underlying Structure ◽  
Stable Form ◽  
Host Matrix ◽  
Bonding System ◽  
Sago Waste

In the present investigation, nanocrystalline silica xerogel (NSX) powders were produced from an amorphous silica xerogel (ASX) extracted from sago waste ash. The NSX powders have been calcined at 1200oC, milled and then annealed at temperatures ranging from a room temperature to 1200oC. Their properties (and most notably the size of the particles) have been characterized on the basis of the experimental data obtained using thermal analysis (DSC/TGA), X-ray diffraction (XRD), Infrared and Raman spectroscopy. For the crystalline silica xerogel powders the results show a narrow distribution of the particle sizes centered around an average value of 636  67 nm. The DSC analysis of NSX indicates that in the temperature range from a room temperature to 300oC five distinct stages of the crystallization process take place, which are delimited by the transition temperature of 38oC, 92oC, 129oC, 168oC, and 246oC, respectively. Above 300oC, the crystalline phase is similar to an amorphous silica xerogel (ASX), i.e. cristoballite-like and tridymite-like crystalline silica phases confirmed by the XRD analysis. It has been observed that the characteristic band of cristoballite is strongly dependent on the thermal history and the NSX transforms into a stable form at a temperature of 1200oC. Both the Raman and the FTIR spectra elucidate the bonding system of the constituent atoms and groups (such as Si, O and OH) and throw light on their underlying structure. The obtained results are important for optimization of the parameters of the technological processes for production of nanocrystalline silica glass ceramics used as a host matrix for luminescence materials, each of which requires a specific porosity and structure.

Rapid, Room-Temperature Synthesis of Antibacterial Bionanocomposites of Lysozyme with Amorphous Silica or Titania

Small ◽  
2006 ◽  
Vol 2 (5) ◽  
pp. 640-643 ◽  
Author(s):  
Heather R. Luckarift ◽  
Matthew B. Dickerson ◽  
Kenneth H. Sandhage ◽  
Jim C. Spain
Keyword(s):  
Amorphous Silica ◽  
Room Temperature ◽  
Temperature Synthesis ◽  
Room Temperature Synthesis

Diatoms Biosilica as Efficient Drug-Delivery System

MRS Advances ◽  
2015 ◽  
Vol 1 (57) ◽  
pp. 3825-3830 ◽  
Author(s):  
Danilo Vona ◽  
Gabriella Leone ◽  
Roberta Ragni ◽  
Fabio Palumbo ◽  
Antonio Evidente ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Drug Delivery System ◽  
Delivery System ◽  
Amorphous Silica ◽  
Model System ◽  
Silica Shell ◽  
Diatom Species ◽  
Size And Morphology ◽  
Fossil Diatoms

ABSTRACTDiatoms are the most abundant resource of biosilica on Earth. These microalgae are encased in a 3-D amorphous silica “shell” called frustule whose size and morphology is strictly dependent on the diatom species. Naturally nanostructured biosilica from diatoms exhibit unique adsorption and confinement properties useful for delivery of molecules of pharmacological interest.In this work fossil biosilica was used as a carrier for Ophiobolin A (a fungal macrolide with anticancer and antiparasitic properties), with the aim to develop a model system of Ophiobolin A loading / delivery. Ophiobolin A delivery properties of fossil diatoms were investigated by spectophotometric analyses.

Sulfur in amorphous silica for advanced room‐temperature sodium‐sulfur battery

2021 ◽  
Author(s):  
Jiahui Zhou ◽  
Yue Yang ◽  
Yingchao Zhang ◽  
Shuaikang Duan ◽  
Xia Zhou ◽  
...  
Keyword(s):  
Amorphous Silica ◽  
Room Temperature ◽  
Sulfur Battery ◽  
Sodium Sulfur Battery ◽  
Sodium Sulfur
Sign in / Sign up

Export Citation Format

Share Document