Effect of residual Na+ on the properties of aerogel prepared with sodium silicate via APD
Source abstract
Abstract
Abstract The removal of Na+ in the process of preparing silica aerogel with sodium silicate as the precursor is a very important and costly step. In this study, effects of residual Na+ content (0∼3.0 wt.%) in the precursor on the properties of silica aerogel were investigated. The thermal conductivity, bulk density, porosity and hydrophobic of the aerogel were tested. And the action mechanism of Na+ was discussed, based on the test results of pore structure, microscopic morphology, and chemical structure composition characterized by N2 adsorption-desorption, SEM and FT-IR. The results showed that as the content of residual Na+ increased, the thermal conductivity and density of the aerogel increased, and the porosity and hydrophobicity decreased. It may be the alkaline dissolution effect of Na+ and the agglomerations of Na+ block part of mesopores, but did not change the skeleton composition of the silica aerogels.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Aerogels and thermal insulation · Surface Modification and Superhydrophobicity · Mesoporous Materials and Catalysis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (44)
Show source-provided references
1. Modern inorganic aerogels10.1002/anie.201611552 ↗
2. Ambient pressure drying: a successful approach for the preparation of silica and silica based mixed oxide aerogels10.1007/s10971-010-2164-2 ↗
3. Transparent thermal insulation silica aerogels10.1039/D0NA00655F ↗
4. C.L.Y. Qiang Research progress of silica aerogels preparation methods. 2017.
5. Silica aerogel as super thermal and acoustic insulation materials10.4236/jep.2018.94020 ↗
6. Thermal insulation material based on SiO2 aerogel10.1016/j.conbuildmat.2016.06.096 ↗
7. Thermal superinsulating silica aerogels reinforced with short man-made cellulose fibers10.1016/j.compositesa.2017.09.018 ↗
8. Silica aerogel: synthesis and applications10.1155/2010/409310 ↗
9. Catalytic performance of nickel nanowires immobilized in silica aerogels for the Co2 hydration reaction10.1021/acsomega.8b03361 ↗
10. Photocatalytic performance of aerogels for organic dyes removal from wastewaters: review study10.1016/j.molliq.2020.113094 ↗
11. A silica aerogel synthesized from olivine and its application as a photocatalytic support10.1016/j.conbuildmat.2020.118709 ↗
12. Fields of application of aerogels (review)10.1023/A:1024401803057 ↗
13. Synthesis and biomedical applications of aerogels: possibilities and challenges10.1016/j.cis.2016.05.011 ↗
14. Polymeric hybrid aerogels and their biomedical applications10.1039/D0SM01261K ↗
15. Aerogels in aerospace: an overview10.1155/2013/406065 ↗
16. Preparation functionalized graphene aerogels as air cleaner filter10.1016/j.proeng.2015.09.062 ↗
17. Functionalized silica aerogels for gas-phase purification, sensing, and catalysis: a review10.1016/j.micromeso.2017.04.055 ↗
18. Environmental remediation with functional aerogels and xerogels
19. Rapid synthesis of sodium silicate based hydrophobic silica aerogel granules with large surface area10.1016/j.apt.2015.01.002 ↗
20. Fast and one-pot synthesis of silica aerogels via a quasi-solvent-exchange-free ambient pressure drying process10.1016/j.micromeso.2015.07.019 ↗
21. Investigation process of silica aerogels synthesized by different types of silica recourses
22. Preparation and characterization of nano-porous silica aerogel from rice husk ash by drying at atmospheric pressure10.1016/j.materresbull.2012.04.143 ↗
23. Physicochemical properties of bamboo leaf aerogels synthesized via different modes of gelation10.1016/j.apsusc.2014.02.031 ↗
24. Hydrophobic silica aerogel derived from wheat husk ash by ambient pressure drying10.1007/s10971-015-3928-5 ↗
25. Synthesis and characterization of silica aerogels dried under ambient pressure bed on water glass10.1016/j.jnoncrysol.2014.12.011 ↗
26. Effect of surface modification on physical properties of silica aerogels derived from fly ash acid sludge10.1016/j.colsurfa.2015.11.055 ↗
27. Sodium silicate based aerogel for absorbing oil from water: the impact of surface energy on the oil/water separation10.1088/2053-1591/ab1eed ↗
28. Study on washing process of silica aerogels prepared from sodium silicate
29. Modeling and optimisation of sodium silicate based silica aerogel synthesis using response surface methodology10.1049/mnl.2018.0093 ↗
30. Effect of different silylation agents on the properties of ambient pressure dried and supercritically dried vinyl-modified silica aerogels10.1016/j.supflu.2019.02.010 ↗
31. Insights into in-situ sol-gel conversion in graphene modified polymer-based silica gels for multifunctional aerogels10.1016/j.cej.2019.123813 ↗
32. Structural Characterization of Aerogels
33. Effect of solvent exchanging process on the preparation of the hydrophobic silica aerogels by ambient pressure drying method using sodium silicate precursor10.1007/s10853-007-1788-2 ↗
34. One-pot synthesis of polymer-reinforced silica aerogels from high internal phase emulsion templates10.1016/j.jcis.2020.03.118 ↗
35. Synthesis of hexagonal and cubic mesoporous silica using power plant bottom ash10.1016/j.micromeso.2007.08.019 ↗
36. Preparation and characterization of silica aerogels from diatomite via ambient pressure drying10.1134/S0036024414070036 ↗
37. Eco-friendly approach for preparation of water-based superhydrophobic silica aerogels via ambient pressure drying10.1088/2053-1591/abda66 ↗
38. The effect of different alkaline catalysts on the formation of silica aerogels prepared by the sol–gel approach10.2109/jcersj2.19226 ↗
39. Effect of particle size on alkali–silica reaction in recycled glass mortars10.1016/j.conbuildmat.2014.05.092 ↗
40. Alkali–silica reaction: kinetics of chemistry of pore solution and calcium hydroxide content in cementitious system10.1016/j.cemconres.2015.01.017 ↗
41. Simulation and modeling of aerogels using atomistic and mesoscale methods
42. A 3-D numerical heat transfer model for silica aerogels based on the porous secondary nanoparticle aggregate structure10.1016/j.jnoncrysol.2012.02.035 ↗
43. Relationship between pore size and the gas pressure dependence of the gaseous thermal conductivity10.1016/j.colsurfa.2007.01.020 ↗
44. Determination of mesopore size of aerogels from thermal conductivity measurements10.1016/S0022-3093(01)01041-9 ↗