Facile synthesis of hydrophobic, thermally stable, and insulative organically modified silica aerogels using co-precursor method

Parale, Vinayak G.; Lee, Kyu Yeon; Jung, Hae Noo Ree; Nah, Ha Yoon; Choi, Hee Young; Kim, Tae Hee; Phadtare, Varsha D.; Park, Hyung Ho

doi:10.1016/j.ceramint.2017.11.189

Cited by 44 publications

(3 citation statements)

References 31 publications

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“…These unique properties of silica aerogel make it a suitable candidate for a variety of advanced applications. Currently, silica aerogels have been used or considered for use in laser experiments, thermal insulation, sound insulation, catalyst support, oil spill clean-up, drug delivery systems, aerospace devices, transparent superinsulating windows, waste management, and pesticides. ,− …”

Section: Introductionmentioning

confidence: 99%

Exposure to Nanoscience and Nanotechnology Using Guided-Inquiry-Based Activities with Silica Aerogel To Promote High School Students’ Motivation

2019

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Nanoscience and nanotechnology are the study and application of materials on a nanometer scale. These fields of study aid the developments of innovative technologies that play an important role in our everyday lives. Enabling students to learn these topics makes learning more meaningful and helps prepare them for future technologies. This study aimed to investigate the effects of learning activities about nanoscience and nanotechnology on students' motivation. The designed activities were based on guided-inquiry learning using silica aerogel as the nanomaterial. This material has many interesting properties such as high thermal insulation, low acoustic velocity, very low density, very high specific surface area, etc., which are influenced by structures on the nanometer scale. A variety of teaching methods, including learning with models, multimedia, hands-on activities, and guided-inquiry learning, were implemented to promote the students' motivation. There were 28 grade 12 science students sampled for this purpose. Three actual methods were adopted to determine the effectiveness of the learning activities, including questionnaires implemented before and after the activities, students' self-assessments, and semistructured interviews at the end of the activities. The results from the questionnaires showed that the students were highly motivated by the nanoscience and nanotechnology learning activities. The students' self-assessment and interviews revealed that the learning activities encouraged the students to learn by allowing them to experience various teaching materials. The students became more interested in finding more information about silica aerogel and other nanomaterials used in daily life.

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Section: Introductionmentioning

confidence: 99%

Exposure to Nanoscience and Nanotechnology Using Guided-Inquiry-Based Activities with Silica Aerogel To Promote High School Students’ Motivation

2019

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“…As a consequence of these exceptional nanoscale structures, ultra-low-density with high porosity materials demonstrate many attention-grabbing and unusual properties [3,4]. Hence these remarkable properties of silica aerogel have many more applications such as optical, catalytic, super thermal insulator, insulated flask, and refrigerators, Cerenkov radiation detectors [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Physicochemical properties of ambient pressure dried surface modified silica aerogels: effect of pH variation

et al. 2020

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This work demonstrates the synthesis of hydrophobic silica aerogels from silicic acid with pH variations by using a costeffective and safe ambient pressure drying process. The work aims to evaluate the effect of pH variation on physicochemical properties of silica aerogels by standard techniques. In the present investigation, we have selected hexane as the solvent and trimethylchlorosilane/hexane was used to perform the surface modification of wet gel in order to elude the contraction and disintegration of gel association subsequent to a drying process. The effect pH on gelation in the form hydrolysis and condensation as well as on amorphous structure, physical properties such as density, thermal stability, surface area, pore-volume, pore radius, optical transmittance were investigated. FTIR spectroscopy was used to confirm the silylation (surface modification) of the prepared silica aerogel samples. Water contact angles were measured to verify the hydrphobic behaviour of all the samples. Among the prepared pH varied samples, the sample having pH ~ 5 shows better results such as high optical transmittance, thermal stability, hydrophobicity and high surface area.

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“…Silica is commonly used as a kind of useful carrier for increasing the thermal stability of the hybrid organicinorganic complexes. 8 Silica incorporated luminescent complexes are widely used in bio-medical applications due to hydrophilic, low toxic and bio-compatible nature. 9 4 ] (M = Li + , Na + and K + ) complexes were synthesized via chemical route using metal hydroxide (LiOH, NaOH, KOH), acetylacetone (acac) and rare earth chloride (DyCl 3 .7H 2 O) as starting reagents.…”

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confidence: 99%

Luminescence Properties of Thermally Stable Silica Incorporated Dysprosium β-Diketonate Complexes

Priya

Kunti

Sharma

2019

ECS J. Solid State Sci. Technol.

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In the present work, silica incorporated complexes of Li[Dy(acac)4], Na[Dy(acac)4], K[Dy(acac)4] were prepared. The Field Emission Scanning Electron Microscopy, diffuse reflectance, photoluminescence and thermal properties of synthesized complexes were studied. The Fourier Transform Infrared spectra confirm the incorporation of silica in complexes. Silica incorporation enhances the thermal stability of the materials. UV-VIS spectra show absorption band from 200 to 350 nm for electronic transition of the ligand. Similar absorption band was observed in the excitation spectra. Emission spectra show two prominent peaks at 485 nm and 575 nm in the blue and yellow regions respectively. Photometric characterization indicates the color coordinates of Na[Dy(acac)4]/SiO2 complex in the white light region upon the UV light excitation. The incorporation of silica enhances the intersystem crossing and decreases the excited state lifetime. Among the three complexes, sodium-based complex shows the color coordinate (0.35, 0.38) very close to near white light with CCT value comparable to the day light. The shorter excited state life time (18.91 μs) and photometric characterization suggest that these complexes can be used as light emitting layer.

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Facile synthesis of hydrophobic, thermally stable, and insulative organically modified silica aerogels using co-precursor method

Cited by 44 publications

References 31 publications

Exposure to Nanoscience and Nanotechnology Using Guided-Inquiry-Based Activities with Silica Aerogel To Promote High School Students’ Motivation

Exposure to Nanoscience and Nanotechnology Using Guided-Inquiry-Based Activities with Silica Aerogel To Promote High School Students’ Motivation

Physicochemical properties of ambient pressure dried surface modified silica aerogels: effect of pH variation

Luminescence Properties of Thermally Stable Silica Incorporated Dysprosium β-Diketonate Complexes

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