Deposition of a titania layer on spherical porous silica particles and their nanostructure-induced vapor sensing properties

Nanoscale ◽  
2017 ◽  
Vol 9 (43) ◽  
pp. 16791-16799 ◽  
Author(s):  
K. Shiba ◽  
T. Takei ◽  
G. Yoshikawa ◽  
M. Ogawa
Keyword(s):  
Porous Silica ◽  
Silica Particles ◽  
Spherical Particles ◽  
Nanoporous Silica ◽  
Sensing Properties ◽  
Vapor Sensing ◽  
Porous Titania ◽  
Titania Layer

A porous titania layer with different nanostructures was formed on monodispersed nanoporous silica spherical particles to demonstrate unique sensitive/selective vapor sensing properties.

Increased fracture toughness in nanoporous silica–polyimide matrix composites

2001 ◽  
Vol 16 (7) ◽  
pp. 1975-1981 ◽  
Author(s):  
Shiling Ruan ◽  
John J. Lannutti ◽  
Stan Prybyla ◽  
Robert R. Seghi
Keyword(s):  
Fracture Toughness ◽  
Sol Gel ◽  
Porous Silica ◽  
Silica Particles ◽  
Nanoporous Silica ◽  
Matrix Composites ◽  
Silica Powder ◽  
Crack Pinning ◽  
Cure Temperature ◽  
Polyimide Matrix

Silica–polyimide nanocomposites were prepared by hot-pressing mixtures of polyimide and highly porous silica powder. The silica powder was produced using a sol-gel process that generates pores as small as 15 Å. The effects of loading, cure, and post-cure temperature on fracture toughness were investigated. The addition of silica particles improved the fracture toughness from 0.5 to a maximum of 1.9 MPa m0.5. However, fracture toughness dropped at silica weight percentages ≥30%. The cure and post-curing temperatures have a strong influence on toughness; post-curing exposure ≥400 °C reduced toughness. Transmission electron microscopy examination of the fracture surfaces indicated that the toughness improvements may occur at the nanometer scale due to crack pinning and branching induced by the nanoporous silica particles.

scholarly journals A Brief Overview of Recent Progress in Porous Silica as Catalyst Supports

2021 ◽  
Vol 5 (3) ◽  
pp. 75
Author(s):  
Preeti S. Shinde ◽  
Pradnya S. Suryawanshi ◽  
Kanchan K. Patil ◽  
Vedika M. Belekar ◽  
Sandeep A. Sankpal ◽  
...  
Keyword(s):  
Heterogeneous Catalysis ◽  
High Surface ◽  
High Surface Area ◽  
Porous Silica ◽  
Textural Properties ◽  
Silica Particles ◽  
Catalyst Supports ◽  
Silica Supports ◽  
Low Degree ◽  
Transfer Properties

Porous silica particles have shown applications in various technological fields including their use as catalyst supports in heterogeneous catalysis. The mesoporous silica particles have ordered porosity, high surface area, and good chemical stability. These interesting structural or textural properties make porous silica an attractive material for use as catalyst supports in various heterogeneous catalysis reactions. The colloidal nature of the porous silica particles is highly useful in catalytic applications as it guarantees better mass transfer properties and uniform distribution of the various metal or metal oxide nanocatalysts in solution. The catalysts show high activity, low degree of metal leaching, and ease in recycling when supported or immobilized on porous silica-based materials. In this overview, we have pointed out the importance of porous silica as catalyst supports. A variety of chemical reactions catalyzed by different catalysts loaded or embedded in porous silica supports are studied. The latest reports from the literature about the use of porous silica-based materials as catalyst supports are listed and analyzed. The new and continued trends are discussed with examples.

Comparison of Chemical Vapor Sensing Properties between Graphene and Carbon Nanotubes

2012 ◽  
Vol 51 ◽  
pp. 045101 ◽  
Author(s):  
Hyung Goo Park ◽  
Sukju Hwang ◽  
Juhwan Lim ◽  
Duck-Hwan Kim ◽  
In Sang Song ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Chemical Vapor ◽  
Sensing Properties ◽  
Vapor Sensing ◽  
Chemical Vapor Sensing

Ultrahigh Surface Area Nanoporous Silica Particles via an Aero-Sol−Gel Process

Langmuir ◽  
2004 ◽  
Vol 20 (7) ◽  
pp. 2523-2526 ◽  
Author(s):  
S. H. Kim ◽  
B. Y. H. Liu ◽  
M. R. Zachariah
Keyword(s):  
Surface Area ◽  
Sol Gel ◽  
Silica Particles ◽  
Nanoporous Silica ◽  
Sol Gel Process

Self-Assembled Gold Nanoparticle/Alkanedithiol Films:  Preparation, Electron Microscopy, XPS-Analysis, Charge Transport, and Vapor-Sensing Properties†

2003 ◽  
Vol 107 (30) ◽  
pp. 7406-7413 ◽  
Author(s):  
Yvonne Joseph ◽  
Isabelle Besnard ◽  
Miriam Rosenberger ◽  
Berit Guse ◽  
Heinz-Georg Nothofer ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Charge Transport ◽  
Gold Nanoparticle ◽  
Xps Analysis ◽  
Sensing Properties ◽  
Vapor Sensing ◽  
Self Assembled

scholarly journals Synthesis of Silica Particles Using Ultrasonic Spray Pyrolysis Method

Metals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 463
Author(s):  
Srecko Stopic ◽  
Felix Wenz ◽  
Tatjana-Volkov Husovic ◽  
Bernd Friedrich
Keyword(s):  
Spray Pyrolysis ◽  
Sol Gel ◽  
Ultrasonic Spray Pyrolysis ◽  
Silica Particles ◽  
Cement Industry ◽  
Submicron Particles ◽  
Spherical Particles ◽  
Spray Pyrolysis Method ◽  
X Ray ◽  
Ultrasonic Spray

Silica has sparked strong interest in hydrometallurgy, catalysis, the cement industry, and paper coating. The synthesis of silica particles was performed at 900 °C using the ultrasonic spray pyrolysis (USP) method. Ideally, spherical particles are obtained in one horizontal reactor from an aerosol. The controlled synthesis of submicron particles of silica was reached by changing the concentration of precursor solution. The experimentally obtained particles were compared with theoretically calculated values of silica particles. The characterization was performed using a scanning electron microscope (SEM) and energy-dispersive X-ray spectroscopy (EDS). X-ray diffraction, frequently abbreviated as XRD, was used to analyze the structure of obtained materials. The obtained silica by ultrasonic spray pyrolysis had an amorphous structure. In comparison to other methods such as sol–gel, acidic treatment, thermal decomposition, stirred bead milling, and high-pressure carbonation, the advantage of the ultrasonic spray method for preparation of nanosized silica controlled morphology is the simplicity of setting up individual process segments and changing their configuration, one-step continuous synthesis, and the possibility of synthesizing nanoparticles from various precursors.

Cobalt oxide decorated porous silica particles: structure and activity relationship in the catalytic oxidation of carbon monoxide

2021 ◽  
pp. 152121
Author(s):  
Daniil A. Eurov ◽  
Tatiana N. Rostovshchikova ◽  
Marina I. Shilina ◽  
Demid A. Kirilenko ◽  
Maria V. Tomkovich ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
Catalytic Oxidation ◽  
Cobalt Oxide ◽  
Porous Silica ◽  
Silica Particles ◽  
Activity Relationship ◽  
Structure And Activity ◽  
Oxidation Of Carbon Monoxide

scholarly journals Evaporation rates of water contained within porous silica particles

1999 ◽  
Vol 1 (5) ◽  
pp. 909-911 ◽  
Author(s):  
Kate J. Beverley ◽  
John H. Clint ◽  
Paul D. I. Fletcher ◽  
Sarah Thubron
Keyword(s):  
Porous Silica ◽  
Silica Particles

scholarly journals ETHANOL VAPOR SENSING PROPERTIES OF ZnO/CuO NANOCOMPOSITES

2018 ◽  
Vol 54 (1A) ◽  
pp. 120 ◽  
Author(s):  
Do Duc Tho
Keyword(s):  
Ethanol Vapor ◽  
Nanocomposite Materials ◽  
Vapor Concentration ◽  
Optimum Temperature ◽  
Wet Chemical Method ◽  
Sensing Properties ◽  
Si Substrates ◽  
Vapor Sensing ◽  
Wet Chemical ◽  
20 Nm

CuO leaf-like with thickness of 20 nm, and ZnO plates with thickness of 40 nm have been successfully prepared through a wet chemical method. The two materials were mixed with different weight ratios (CuO/ZnO) to produce nanocomposite materials. Ethanol vapor sensing properties of films derived from obtained materials on SiO2/Si substrates attached with Pt interdigitated electrodes were investigated at operating temperatures in the range of 250 C – 400 C and ethanol vapor concentration in the range of 125 - 1500 ppm. The results showed that the composite of 30 wt% CuO/70 wt% ZnO exhibited the highest response to ethanol vapor at an optimum temperature of 375 oC.

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