skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Membrane synthesis via in-situ pore formation in silica gels through dynamic miscibility with soybean oil

Journal Article · · Colloids and Surfaces. A, Physicochemical and Engineering Aspects

The dynamic immiscibility between vegetable oil and organic silica precursors during sol-gel synthesis was used to tailor the microstructure of gels made with tetraethoxysilane (TEOS) or tetraethoxysilane+methyltrimethoxysilane (MTMS). Vegetable oil was investigated as an environmentally friendly and cheaper alternative to many other porogens. Oil concentrations of 9.09 v/v% and 33.33 v/v% were studied. For both TEOS and TEOS+MTMS gels, the miscibility of the oil and precursor decreases as the silica gel network forms, leading to oil-rich regions within the silica matrix. Gels containing MTMS maintained partial miscibility with the oil during gel formation due to the non-hydrolysable methyl groups on the MTMS. The pore structure of MTMS gels appeared more interconnected compared to the isolated pores observed in gels made with only TEOS. To create membranes with hierarchical pore structures, solvent exchanges were performed on gels or dried gels (i.e., xerogels) were calcined. The effect of the methyl group was also observed in the results of the time sweep rheology, as the addition of oil to the TEOS+MTMS gels caused an increase in the time to form the spanning gel. The trend was the opposite for oil additions to TEOS gels, which only contained polar groups. Xerogel membranes made with TEOS+MTMS had higher specific surface areas (SSAs) than those made with TEOS. For oil concentrations of 33.33 v/v%, xerogels made from TEOS+MTMS had an average SSA of 1068 + 113 m2 g-1, an order of magnitude higher than the average SSA of 103 + 6 m2 g-1 for xerogels made with TEOS.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC05-76RL01830
OSTI ID:
1872428
Report Number(s):
PNNL-SA-165506
Journal Information:
Colloids and Surfaces. A, Physicochemical and Engineering Aspects, Vol. 636
Country of Publication:
United States
Language:
English

References (66)

The investigation of nanofluidic energy absorption system based on high porosity aerogel nano-materials journal March 2019
Catalytic Applications of Aerogels journal July 2007
A review on silica aerogel-based materials for acoustic applications journal June 2021
Mechanically reinforced silica aerogel nanocomposites via surface initiated atom transfer radical polymerizations journal January 2010
Robust, ultra-insulative and transparent polyethylene-based hybrid silica aerogel with a novel non-particulate structure journal July 2019
Novel and simple design of nanostructured, super-insulative and flexible hybrid silica aerogel with a new macromolecular polyether-based precursor journal March 2020
Structure−Property Relationships in Porous 3D Nanostructures: Epoxy-Cross-Linked Silica Aerogels Produced Using Ethanol as the Solvent journal April 2009
Novel flexible, hybrid aerogels with vinyl- and methyltrimethoxysilane in the underlying silica structure journal April 2016
Mesoporous Silica–Gelatin Aerogels for the Selective Adsorption of Aqueous Hg(II) journal December 2019
Structural and mechanical properties of hybrid silica aerogel formed using triethoxy(1-phenylethenyl)silane journal May 2020
Flexible Nanofiber-Reinforced Aerogel (Xerogel) Synthesis, Manufacture, and Characterization journal October 2009
Characteristics of ambient-pressure-dried aerogels synthesized via different surface modification methods journal June 2015
Effect of different silylation agents on the properties of ambient pressure dried and supercritically dried vinyl-modified silica aerogels journal May 2019
Heavy metals in Iberian soils: Removal by current adsorbents/amendments and prospective for aerogels journal November 2016
A reconsideration on the definition of the term aerogel based on current drying trends journal March 2018
Elastic silica aerogel using methyltrimethoxysilane precusor via ambient pressure drying journal July 2015
An overview on silica aerogels synthesis and different mechanical reinforcing strategies journal February 2014
Development of transparent silica aerogel over a wide range of densities
  • Tabata, Makoto; Adachi, Ichiro; Ishii, Yoshikazu
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 623, Issue 1 https://doi.org/10.1016/j.nima.2010.02.241
journal November 2010
Phase Separation in Gelling Silica-Organic Polymer Solution: Systems Containing Poly(sodium styrenesulfonate) journal October 1991
One-pot synthesis of polymer-reinforced silica aerogels from high internal phase emulsion templates journal August 2020
Ultralight Silica Foams with a Hierarchical Pore Structure via a Surfactant-Free High Internal Phase Emulsion Process journal August 2018
Flexible, elastic, and superhydrophobic silica-polymer composite aerogels by high internal phase emulsion process journal July 2017
Controlled pore formation in organotrialkoxysilane-derived hybrids: from aerogels to hierarchically porous monoliths journal January 2011
Preparation and characterisation of silica monoliths using a triblock copolymer (F68) as porogen journal December 2009
Poly(glycidyl methacrylate)- block -poly(ϵ-caprolactone)- block -poly(glycidyl methacrylate) Triblock Copolymer: Synthesis and Use as Mesoporous Silica Porogen journal January 2013
Synthesis and characterization of mesoporous silica monoliths with polystyrene homopolymers as porogens journal January 2016
Preparation of sol–gel hybrid materials from γ-methacryloxypropyltrimethoxysilane and tetramethyl orthosilicate: study of the hydrolysis and condensation reactions journal September 2011
A study on the combustion characteristics of PVC, poly(styrene), poly(ethylene), and poly(propylene) particles under high heating rates journal October 1994
Crosslinked epoxy microspheres: Preparation, surface-initiated polymerization, and use as macroporous silica porogen journal August 2012
Spontaneous Formation of Hierarchical Macro−Mesoporous Ethane−Silica Monolith journal August 2004
Silica-Based Mesoporous Organic–Inorganic Hybrid Materials journal May 2006
Sol–gel synthesis of macro–mesoporous titania monoliths and their applications to chromatographic separation media for organophosphate compounds journal October 2009
Development of monolithic adsorbent via polymeric sol–gel process for low-concentration CO2 capture journal June 2015
Is the bet equation applicable to microporous adsorbents? book September 2007
Evaluation of ATR−FTIR Spectroscopy as an “in Situ” Tool for Following the Hydrolysis and Condensation of Alkoxysilanes under Rich H 2 O Conditions journal October 1998
Discriminant analysis of edible oils and fats by FTIR, FT-NIR and FT-Raman spectroscopy journal November 2005
Kinetic study of methyltriethoxysilane (MTES) hydrolysis by FTIR spectroscopy under different temperatures and solvents journal January 2008
A FT-IR Study of the Hydrolysis of Tetraethylorthosilicate (TEOS). journal January 1998
Classification of Vegetable Oils by FT-IR journal August 1997
Hydrolysis and condensation of silicates: Effects on structure journal March 1988
Study of the Effects of Progressive Changes in Alkoxysilane Structure on Sol−Gel Reactivity journal October 2006
Morphological Analysis of Physically Reconstructed Silica Monoliths with Submicrometer Macropores: Effect of Decreasing Domain Size on Structural Homogeneity journal February 2015
Comparative studies of the physical and hydrophobic properties of TEOS based silica aerogels using different co-precursors journal January 2003
Controlled Formation of Silica Particles from Tetraethyl Orthosilicate in Nonionic Water-in-Oil Microemulsions journal June 1997
Kinetics of silica particle formation in nonionic W/O microemulsions from TEOS journal November 1996
Formation of Silica Nanoparticles in Microemulsions journal March 2007
Fatty Acids Composition of Vegetable Oils and Its Contribution to Dietary Energy Intake and Dependence of Cardiovascular Mortality on Dietary Intake of Fatty Acids journal June 2015
Vegetable oil-based polymeric materials: synthesis, properties, and applications journal January 2010
Variables affecting the yields of fatty esters from transesterified vegetable oils journal October 1984
Synthesis and characterization of vegetable oil derived esters: evaluation for their diesel additive properties journal March 2004
Pyrolysis of triglyceride materials for the production of renewable fuels and chemicals journal September 2007
Production of vegetable oil-based biofuels—Thermochemical behavior of fatty acid sodium salts during pyrolysis journal November 2009
Hydrophilic and hydrophobic modifications of colloidal silica particles for Pickering emulsions journal February 2017
Fabrication of Pickering emulsion based on particles combining pectin and zein: Effects of pectin methylation journal March 2021
CXCVI.—Emulsions journal January 1907
Methyl-grafted silica nanoparticle stabilized water-in-oil Pickering emulsions with low-temperature stability journal April 2021
Drying of Silica Gels to Obtain Aerogels:Phenomenology and Basic Techniques journal January 2003
Drying of aerogels in different solvents between atmospheric and supercritical pressures journal April 1998
Subcritical drying of silica gels journal December 1996
Silica based aerogel-like materials obtained by quick microwave drying journal May 2013
Ambient pressure drying of silica aerogels after hydrophobization with mono-, di- and tri-functional silanes and mixtures thereof journal August 2019
Silica aerogel films at ambient pressure journal October 1995
Methyltrimethoxysilane based monolithic silica aerogels via ambient pressure drying journal March 2007
Flexible silica aerogel based on methyltrimethoxysilane with improved mechanical property journal May 2017
Sol–gel silica antireflective coating with enhanced abrasion-resistance using polypropylene glycol as porogen journal May 2014
Open cell aerogel foams with hierarchical pore structures journal September 2017