Hierarchically structured glass monoliths based on polyurethane foams as template

Reinhardt, Bjoern; Herwig, Jan; Rannabauer, Stefan; Scheffler, Michael; Enke, Dirk

doi:10.1016/j.jeurceramsoc.2013.11.042

Cited by 7 publications

(5 citation statements)

References 5 publications

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“…In many aspects glass foams are superior to conventional polymeric foams, especially in respect of mechanical properties (compression and flexural strength) and flame resistance. 3,8,9 There are different routes to obtain glass foams: gel casting, which allows the production of foam with high porosity (80%-93%) and high compression strength (1.7-6 MPa) [10][11][12][13] ; polymeric sponge replication, which produces foams with porosity higher than 90% [14][15][16] ; high-pressure sintering, which produces foams with porosity until 89% 17 ; foaming by using foaming agents, which is the route used in this research. 2,18,19 The manufacture of glass foams using foaming agents consists of mixing powdered glass and other minerals with materials that react or decompose and release gases at elevated temperatures (foaming agents).…”

Section: Introductionmentioning

confidence: 99%

Glass foams produced by glass waste, sodium hydroxide, and borax with several pore structures using factorial designs

Silva

Kubaski

Tebcherani

2019

Int J Applied Ceramic Tech

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Glass foams have great potential for several technological applications, for example, filters and thermal or acoustic insulators. Sodium hydroxide is an efficient foaming agent to obtain glass foams with high level of porosity. However, the control of variables that influences on structure, type, and size of pores of glass foams is necessary.This study evaluates the influence of composition and process parameters on glass foams based on soda-lime glass waste, sodium hydroxide, and borax. Experiments were conducted using factorial designs. According to the experimental conditions, bulk density varied from 0.16 to 0.79 g cm −3 and maximum porosity of 92%. Amounts of NaOH and borax in addition to sintering temperature are the main variables of the foaming process. The role of NaOH content is to reduce the density and closed porosity of glass foams associated with an increase in their open porosity. The addition of borax with low NaOH amount promoted densification and pore closure in glass foams. NaOH and borax content allows controlling the type of predominant porosity on foams (open or closed porosity). Glass foams were resistant to sulfuric acid, hydrochloric acid, and nitric acid in diluted solutions. These results allow controlling the pore structure of glass foams for different applications. K E Y W O R D Sdensity, glass, glass foam, porous materials, sodium/sodium compounds

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Section: Introductionmentioning

confidence: 99%

Glass foams produced by glass waste, sodium hydroxide, and borax with several pore structures using factorial designs

Silva

Kubaski

Tebcherani

2019

Int J Applied Ceramic Tech

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“…The three-phase contact angle was calculated as h SB = 85.4 ± 5°, so the particles in this material system are connected via pendular shaped bridges [17]. Fig.…”

Section: Resultsmentioning

confidence: 99%

“…After drying of the infiltrated templates all organic components get pyrolized in a debinding step, the following sintering step consolidates the replicated structure [14,17], and typically pore sizes >10 lm are achieved [10]. Enke et al [14,17] reported about the combination of these two methods with the leaching technique. Glass monoliths with a hierarchical porosity and a bimodal pore size distribution can be manufactured.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of highly porous glass filters using capillary suspension processing

Maurath

Dittmann

Schultz

et al. 2015

Separation and Purification Technology

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“…An additional alkaline treatment with sodium hydroxide solution can be performed in order to remove secondary silica species from the leaching-based pores. 25 The sintered glass monoliths exhibit a purely macroporous structure formed by connected hollow struts. This additional pore size is adjustable by using template foams of different strut sizes or different ppi (pores per inch) values.…”

Section: Foam Replicationmentioning

confidence: 99%

Recent advances in the synthesis of hierarchically porous silica materials on the basis of porous glasses

et al. 2016

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The thermal phase separation and subsequent leaching of sodium borosilicate glasses is a well established route for the preparation of porous glasses exhibiting adjustable pore sizes in the range of 1 nm up to almost 1 mm as well as a very flexible geometric shape. The combination of this route with a large spectrum of synthesis strategies for the implementation of an additional pore system enables the preparation of hierarchically porous glass-based materials. This review covers a wide range of preparative routes for hierarchically porous silica materials starting from the sodium borosilicate glass with a special emphasis on the very recent developments in this versatile field of materials engineering.

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Hierarchically structured glass monoliths based on polyurethane foams as template

Cited by 7 publications

References 5 publications

Glass foams produced by glass waste, sodium hydroxide, and borax with several pore structures using factorial designs

Glass foams produced by glass waste, sodium hydroxide, and borax with several pore structures using factorial designs

Fabrication of highly porous glass filters using capillary suspension processing

Recent advances in the synthesis of hierarchically porous silica materials on the basis of porous glasses

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