In Situ Modification of the Silica Backbone leading to Highly Porous Monolithic Hybrid Organic–Inorganic Materials via Ambient Pressure Drying

2014 ◽  
Vol 6 (2) ◽  
pp. 1025-1029 ◽  
Author(s):  
Theresa Noisser ◽  
Gudrun Reichenauer ◽  
Nicola Hüsing
Keyword(s):  
Ambient Pressure ◽  
Ambient Pressure Drying ◽  
Inorganic Materials ◽  
In Situ Modification ◽  
Highly Porous

Transparent, ultraflexible, and superinsulating nanofibrous biocomposite aerogels via ambient pressure drying

2021 ◽  
Author(s):  
Guoqing Zu ◽  
Sheng Zeng ◽  
Ben Yang ◽  
Jia Huang
Keyword(s):  
Ambient Pressure ◽  
Ambient Pressure Drying ◽  
Oxidized Starch ◽  
Nanofibrous Structure ◽  
First Time ◽  
Highly Porous

We report transparent, flexible, and superinsulating biocomposite aerogels with a homogeneous, highly porous, and nanofibrous structure based on oxidized starch and polyorganosiloxane via facile ambient pressure drying for the first time.

Permittivities of Ultra-Low Dielectric Silica Beads and Aerogels

2015 ◽  
Vol 830-831 ◽  
pp. 444-447
Author(s):  
S. Nagapriya ◽  
B. Masin ◽  
H. Sreemoolanadhan ◽  
M.R. Ajith ◽  
Mariamma Mathew ◽  
...  
Keyword(s):  
High Speed ◽  
Ambient Pressure ◽  
Porous Silica ◽  
Silica Aerogels ◽  
Ambient Pressure Drying ◽  
Inorganic Materials ◽  
Silica Gels ◽  
Low Dielectric ◽  
Silica Beads ◽  
Lcr Meter

Materials with relative permittivity or dielectric constant near to that of air (εr~1) are known as ‘ultra-low k’ materials. They find a number of applications in inter-connects of micro-electronic circuits, antennae, high-speed communication substrates etc. Among the inorganic materials, porous silica is the widely studied candidate. Porous silica can be of many types depending upon the extent of porosity and size and connectivity of pores. This paper presents the details of measurement of permittivities and the results of silica beads and silica aerogels. Silica beads, prepared by microwave heating of silica gels, are spherical beads of average 1mm size. Hydrophobic silica aerogels, prepared by ambient pressure drying of silica gels, are irregular chunks of 5-10 mm size. Both are potential bulk fill insulation materials and hence the permittivity can be measured as an aggregate filling a definite volume. The permittivities of these have been measured upto 1 MHz by 3-terminal method using a precision LCR meter and a powder-paste cell as per ASTM-D150-11. The εr values of silica aerogels and silica beads in 20 Hz-1 MHz range could be measured and are less than 1.6 at 1 MHz.

scholarly journals Ambient - Pressure Silica Aerogel Films

1994 ◽  
Vol 371 ◽  
Author(s):  
Sai S. Prakash ◽  
C. Jeffrey Brinker ◽  
Alan J. Hurd ◽  
Sudeep M. Rao
Keyword(s):  
Refractive Index ◽  
Ambient Pressure ◽  
Environmental Scanning Electron Microscopy ◽  
Environmental Scanning ◽  
High Porosity ◽  
Silica Films ◽  
Imaging Ellipsometry ◽  
Pure Solvent ◽  
Highly Porous

AbstractVery highly porous (aerogel) silica films with refractive index in the range 1.006-1.05 (equivalent porosity 98.5-88%) were prepared by an ambient-pressure process1,2. It was shown earlier using in situ ellipsometric imaging1 that the high porosity of these films was mainly attributable to the dilation or “springback” of the film during the final stage of drying. This finding was irrefutably reconfirmed by visually observing a “springback” of >600% using environmental scanning electron microscopy (ESEM). Ellipsometry and ESEM also established the near 100% reversibility of aerogel film deformation during solvent intake and drying. Film thickness profile measurements (near the drying line) for the aerogel, xerogel and pure solvent cases are presented from imaging ellipsometry. The thickness of these films (crack-free) were controlled in the range 0.1-3.5 μm independent of refractive index.

Hydrophobic Silica Aerogel Prepared In-situ by Ambient Pressure Drying and Its Thermal Stability

2009 ◽  
Vol 25 (09) ◽  
pp. 1811-1815 ◽  
Author(s):  
LI Gui-An ◽  
◽  
◽  
ZHU Ting-Liang ◽  
YE Lu-Yuan ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Silica Aerogel ◽  
Ambient Pressure ◽  
Ambient Pressure Drying ◽  
Hydrophobic Silica

scholarly journals Morphology control of nickel nanoparticles prepared in situ within silica aerogels produced by novel ambient pressure drying

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Jialu Lu ◽  
Jiabin Wang ◽  
Khalil T. Hassan ◽  
Alina Talmantaite ◽  
Zhengguang Xiao ◽  
...  
Keyword(s):  
Nickel Nanoparticles ◽  
Ambient Pressure ◽  
Morphology Control ◽  
Silica Aerogels ◽  
Ambient Pressure Drying

Hierarchically Structured Silica Monoliths

2003 ◽  
Vol 775 ◽  
Author(s):  
Nicola Hüsing ◽  
Christina Raab ◽  
Viktoria Torma
Keyword(s):  
Electron Microscopy ◽  
Liquid Crystalline ◽  
Ambient Pressure ◽  
Supercritical Drying ◽  
Ambient Pressure Drying ◽  
X Ray Scattering ◽  
Transmission Electron ◽  
Liquid Crystalline Phases ◽  
Drying Procedures ◽  
Highly Porous

AbstractLarge monoliths with periodic mesopores in a macroporous web-like network structure are prepared using a diol-modified silane as silica precursor and lyotropic liquid crystalline phases of surfactants in water as structure-directing agents. The surfactant concentration is varied from 5 to 40wt%. Highly porous materials are synthesized applying two different drying procedures: supercritical drying with CO2 or ethanol, in addition to ambient pressure drying including surfactant expulsion via silanisation treatments with trimethylchlorosilane or hexamethyl disilazane. The monolithic materials show a very unique macro- and mesostructure which is characterized by N2-sorption measurements, small-angle X-ray scattering (SAXS), transmission electron microscopy (TEM) and scanning electron microscopy (SEM).

In-situ Modification of Graphene Oxide by Insoluble Sulfur and Application for Nitrile Butadiene Rubber

2020 ◽  
Vol 35 (2) ◽  
pp. 221-228
Author(s):  
S.-B. Chen ◽  
T.-X. Li ◽  
S.-H. Wan ◽  
X. Huang ◽  
S.-W. Cai ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Butadiene Rubber ◽  
Nitrile Butadiene Rubber ◽  
In Situ Modification
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