Highly porous elastomer-silsesquioxane nanocomposites synthesized within high internal phase emulsions

2008 ◽  
Vol 46 (7) ◽  
pp. 2357-2366 ◽  
Author(s):  
Jenny Normatov ◽  
Michael S. Silverstein
Keyword(s):  
Internal Phase ◽  
Highly Porous

Synthesis of hydrogel polyHIPEs from functionalized glycidyl methacrylate

2016 ◽  
Vol 7 (32) ◽  
pp. 5132-5138 ◽  
Author(s):  
David Pahovnik ◽  
Janja Majer ◽  
Ema Žagar ◽  
Sebastijan Kovačič
Keyword(s):  
Glycidyl Methacrylate ◽  
Internal Phase ◽  
Oil In Water ◽  
Highly Porous

Highly porous hydrogels based on functionalized glycidyl methacrylate (GMA) have been successfully prepared through the high internal phase oil-in-water emulsions.

scholarly journals Highly porous conjugated polymers for selective oxidation of organic sulfides under visible light

2014 ◽  
Vol 50 (60) ◽  
pp. 8177-8180 ◽  
Author(s):  
Zi Jun Wang ◽  
Saman Ghasimi ◽  
Katharina Landfester ◽  
Kai A. I. Zhang
Keyword(s):  
Visible Light ◽  
Conjugated Polymers ◽  
Emulsion Polymerization ◽  
Surface Area ◽  
Selective Oxidation ◽  
High Surface ◽  
High Surface Area ◽  
Organic Sulfides ◽  
Internal Phase ◽  
Highly Porous

High surface area porous conjugated polymers were synthesized via the high internal phase emulsion polymerization technique and micropore engineering as efficient heterogeneous photocatalysts for highly selective oxidation of organic sulfides to sulfoxides under visible light.

An environmentally benign post-polymerization functionalization strategy towards unprecedented poly(vinylamine) polyHIPEs

2021 ◽  
Vol 12 (8) ◽  
pp. 1155-1164
Author(s):  
Sarah Jurjevec ◽  
Antoine Debuigne ◽  
Ema Žagar ◽  
Sebastijan Kovačič
Keyword(s):  
Environmentally Benign ◽  
Internal Phase ◽  
Hydrolysis Of ◽  
Highly Porous ◽  
Porous Poly

Interconnected highly porous poly(vinylamine) monoliths are produced by post-polymerization hydrolysis of emulsion-templated poly(N-vinylformamide) polyHIPEs (polymerized high internal phase emulsions).

Surface Modification of High Internal Phase Emulsion Foam as a Scaffold for Tissue Engineering Application via Atmospheric Pressure Plasma Treatment

2012 ◽  
Vol 77 ◽  
pp. 172-177 ◽  
Author(s):  
Pornsri Pakeyangkoon ◽  
Rathanawan Magaraphan ◽  
Pomthong Malakul ◽  
Manit Nithitanakul
Keyword(s):  
Tissue Engineering ◽  
Contact Angle ◽  
Plasma Treatment ◽  
Atmospheric Pressure ◽  
Atmospheric Pressure Plasma ◽  
Tissue Engineering Application ◽  
High Internal Phase Emulsion ◽  
Pressure Plasma ◽  
Internal Phase ◽  
Highly Porous

Atmospheric pressure plasma treatment was used to improve hydrophilic properties and scaffold/cell interaction of poly(S/EGDMA)polyHIPE highly porous foam, prepared from poly(styrene/ethylene glycol dimethacrylate) using high internal phase emulsion technique. With our synthesis procedure and surface treatment, this bioactive material, featuring highly porous structure and good mechanical strength, can be applied as a scaffold for tissue engineering applications. The treatment time and external plasma parameters were investigated in regards to the polyHIPE foam surface’s appropriate for fibroblast implantation. The changes in surface properties were characterized by contact angle measurement, showing that the exposure to air-plasma induced polyHIPE foam with hydrophilic surfaces, as observed by a decrease in contact angle degree. Enhancement of the interaction between the polyHIPE foam and the L929 fibroblast-like cells would imply the hydrophilic improvement of the polyHIPE foam surface due to the polar-like property of the biofluid cell medium.

Cellulose-based, highly porous polyurethanes templated within non-aqueous high internal phase emulsions

Cellulose ◽  
2020 ◽  
Vol 27 (7) ◽  
pp. 4007-4018 ◽  
Author(s):  
Tao Zhang ◽  
Yan Zhao ◽  
Michael S. Silverstein
Keyword(s):  
Internal Phase ◽  
Highly Porous

Highly Porous Polymeric Foam of Maleimide-Termiated Poly(arylene ether sulfone) Oligomers via High Internal Phase Emulsions

2012 ◽  
Vol 77 ◽  
pp. 165-171 ◽  
Author(s):  
Khemchart Thanamongkollit ◽  
Pornsri Pakeyangkoon ◽  
Pomthong Malakul ◽  
Manit Nithitanakul
Keyword(s):  
Mechanical Properties ◽  
Co2 Adsorption ◽  
Testing Machine ◽  
Continuous Phase ◽  
Mixed Surfactants ◽  
Aryl Ether ◽  
Sorbitan Monooleate ◽  
Polymeric Form ◽  
Internal Phase ◽  
Highly Porous

PolyHIPEs are highly porous polymeric form, prepared through emulsion templating by polymerizing the continuous phase of high internal phase emulsions (HIPEs). A maleimide-terminated aryl ether sulfone oligomer (MAPES) was copolymerized with divinylbenzene (DVB) in the continuous phase, using a mixed surfactants system (sorbitan monooleate (Span80), cetyltrimethylammonium bromide (CTAB), dodecylbenzenesulfonic acid sodium salt (DDBSS)), and peroxide initiator, to improve CO2 adsorption and the mechanical properties of obtained materials. PolyHIPEs were prepared by two different ratios of mixed surfactants; (SPAN80, DDBSS, and CTAB; 6.3, 0.4, and 0.3 wt%, which was denoted as 7s) and (SPAN80, DDBSS, and CTAB; 11.3, 0.4, and 0.3 wt%, which was denoted as 12s). 0, 2.5, 5, 10, 20, and 30 wt% of maleimide-terminated aryl ether sulfone oligomer were copolymerized with DVB. All PolyHIPE nanocomposites foam were characterized for phase morphology, thermal behavior, surface area, mechanical properties and adsorption of CO2 by using SEM, TG-DTA, N2 adsorption-desorption, LLOYD universal testing machine and CO2 adsorption unit, respectively. The obtained PolyHIPEs showed an open cell and a secondary pore structure with surface areas of approximately 400m2/g. CO¬2 adsorption tests were characterized by pilot gasification unit and the obtained materials showed higher adsorption than neat poly(DVB) without MAPES. Compressive modulus test of the materials showed a higher modulus than for poly(DVB) PolyHIPEs.

Use of fractals to describe microstructures of porous thick-film platinum electrodes

1992 ◽  
Vol 50 (1) ◽  
pp. 314-315
Author(s):  
Steven D. Toteda
Keyword(s):  
Fractal Dimension ◽  
Power Plants ◽  
Electrical Response ◽  
Cubic Phase ◽  
Platinum Electrodes ◽  
Fine Grained ◽  
Impedance Response ◽  
Platinum Particles ◽  
Energy Surfaces ◽  
Highly Porous

Zirconia oxygen sensors, in such applications as power plants and automobiles, generally utilize platinum electrodes for the catalytic reaction of dissociating O2 at the surface. The microstructure of the platinum electrode defines the resulting electrical response. The electrode must be porous enough to allow the oxygen to reach the zirconia surface while still remaining electrically continuous. At low sintering temperatures, the platinum is highly porous and fine grained. The platinum particles sinter together as the firing temperatures are increased. As the sintering temperatures are raised even further, the surface of the platinum begins to facet with lower energy surfaces. These microstructural changes can be seen in Figures 1 and 2, but the goal of the work is to characterize the microstructure by its fractal dimension and then relate the fractal dimension to the electrical response. The sensors were fabricated from zirconia powder stabilized in the cubic phase with 8 mol% percent yttria. Each substrate was sintered for 14 hours at 1200°C. The resulting zirconia pellets, 13mm in diameter and 2mm in thickness, were roughly 97 to 98 percent of theoretical density. The Engelhard #6082 platinum paste was applied to the zirconia disks after they were mechanically polished ( diamond). The electrodes were then sintered at temperatures ranging from 600°C to 1000°C. Each sensor was tested to determine the impedance response from 1Hz to 5,000Hz. These frequencies correspond to the electrode at the test temperature of 600°C.

Microstructural observations of the “Wustite-Spinel” coexistence following quenching of cation-excess spinels, Ni2(1+x)Ti1-xO4

1990 ◽  
Vol 48 (4) ◽  
pp. 1058-1059
Author(s):  
Ian M. Anderson ◽  
Arnulf Muan ◽  
C. Barry Carter
Keyword(s):  
Film Growth ◽  
Spinel Phase ◽  
Model Systems ◽  
Ion Milling ◽  
Coexistence Of Phases ◽  
Nonequilibrium Conditions ◽  
Diffraction Patterns ◽  
Spinel Structures ◽  
Highly Porous ◽  
Standard Techniques

Oxide mixtures which feature a coexistence of phases with the wüstite and spinel structures are considered model systems for the study of solid-state reaction kinetics, phase boundaries, and thin-film growth, and such systems are especially suited to TEM studies. (In this paper, the terms “wüstite” and “spinel” will refer to phases of those structure types.) The study of wüstite-spinel coexistence has been limited mostly to systems near their equilibrium condition, where the assumptions of local thermodynamic equilibrium are valid. The cation-excess spinels of the type Ni2(1+x)Ti1-xO4, which reportedly exist only above 1375°C4, provide an excellent system for the study of wüstite-spinel coexistence under highly nonequilibrium conditions. The nature of these compounds has been debated in the literature. X-ray and neutron powder diffraction patterns have been used to advocate the existence of a single-phase, non- stoichiometric spinel. TEM studies of the microstructure have been used to suggest equilibrium coexistence of a stoichiometric spinel, Ni2TiO4, and a wüstite phase; this latter study has shown a coexistence of wüstite and spinel phases in specimens thought to have been composed of a single, non- stoichiometric spinel phase. The microstructure and nature of this phase coexistence is the focus of this study. Specimens were prepared by ball-milling a mixture of NiO and TiO2 powders with 10 wt.% TiO2. The mixture was fired in air at 1483°C for 5 days, and then quenched to room temperature. The aggregate thus produced was highly porous, and needed to be infiltrated prior to TEM sample preparation, which was performed using the standard techniques of lapping, dimpling, and ion milling.

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