Phase separation of organic/inorganic hybrids induced by calcination: A novel route for synthesizing mesoporous silica and carbon materials

Liu, Sen; Zhang, Zhe; Zhang, Haiyan; Zhang, Yonglai; Shu, Wei; Ren, Limin; Wang, Qianqian; He, Yinyan; Li, Fēi; Xiao, Feng

doi:10.1016/j.jcis.2010.02.008

Cited by 17 publications

(11 citation statements)

References 41 publications

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“…For NaOH treated SiC, new peaks at 470.79 and 1103.71 cm –1 belong to the bending vibration and asymmetrical stretching of Si–O–Si bonds, respectively. , This is mainly ascribed that the silica layer on the surface of SiC is in the amorphous state. In addition, broad and medium absorption bands around 3447.05 and 1628.44 cm –1 are assigned to Si–OH groups. , As for TEOS treated SiC, the stronger absorption peaks of Si–OH are ascribed to SiO 2 deposited on the surface of SiC nanowires. Compared with NaOH treated SiC, the stronger absorption peaks of Si–O–Si and the weaker absorption peaks of Si–C appear in TEOS treated SiC.…”

Section: Resultsmentioning

confidence: 93%

“…In addition, broad and medium absorption bands around 3447.05 and 1628.44 cm −1 are assigned to Si−OH groups. 41,42 As for TEOS treated SiC, the stronger absorption peaks of Si−OH are ascribed to SiO 2 deposited on the surface of SiC nanowires. Compared with NaOH treated SiC, the stronger absorption peaks of Si−O−Si and the weaker absorption peaks of Si−C appear in TEOS treated SiC.…”

Section: Resultsmentioning

confidence: 97%

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SiC Nanowires with Tunable Hydrophobicity/Hydrophilicity and Their Application as Nanofluids

et al. 2016

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In this paper, several methods including HF, NaOH, TEOS, and PVP treatment were adopted to modify the wettability of silicon carbide (SiC) nanowires switching from hydrophobic to hydrophilic. The phase and microstructure investigated by XRD, FT-IR, XPS, TGA, SEM, and TEM demonstrated SiC nanowires switching from hydrophobic to hydrophilic due to the surface-tethered hydrophilic layer as well as increasing interspace between nanowires. Besides this, SiC nanowires with hydrophilicity may effectively improve the thermal conductivity of a fluid. The thermal conductivity of aqueous SiC nanowires after TEOS treatment with just 0.3 vol % was remarkably improved up to ca. 13.0%.

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Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 97%

SiC Nanowires with Tunable Hydrophobicity/Hydrophilicity and Their Application as Nanofluids

et al. 2016

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“…FTIR spectra of as-spun fibers (Figure ) indicate which bonds are formed or lost during the sol–gel and electrospinning processes and elucidate whether silica–PVA hybrids are a physical mixture or covalently bound network. PVA shows a prominent peak around 3300 cm –1 due to its −OH groups. , Another characteristic peak between 1000 and 1050 cm –1 is assigned to the C–O–H stretching movement in aliphatic alcohols. Silica shows characteristic peaks at 1096, 820, and 483 cm –1 corresponding to the asymmetrical stretching, symmetric stretching, and bending vibrations in Si–O–Si bonds, respectively. , …”

Section: Resultsmentioning

confidence: 99%

Hybrid Silica–PVA Nanofibers via Sol–Gel Electrospinning

et al. 2012

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We report on the synthesis of poly(vinyl alcohol) (PVA)-silica hybrid nanofibers via sol-gel electrospinning. Silica is synthesized through acid catalysis of a silica precursor (tetraethyl orthosilicate (TEOS) in ethanol-water), and fibers are obtained by electrospinning a mixture of the silica precursor solution and aqueous PVA. A systematic investigation on how the amount of TEOS, the silica-PVA ratio, the aging time of the silica precursor mixture, and the solution rheology influence the fiber morphology is undertaken and reveals a composition window in which defect-free hybrid nanofibers with diameters as small as 150 nm are obtained. When soaked overnight in water, the hybrid fibers remain intact, essentially maintaining their morphology, even though PVA is soluble in water. We believe that mixing of the silica precursor and PVA in solution initiates the participation of the silica precursor in cross-linking of PVA so that its -OH group becomes unavailable for hydrogen bonding with water. FTIR analysis of the hybrids confirms the disappearance of the -OH peak typically shown by PVA, while formation of a bond between PVA and silica is indicated by the Si-O-C peak in the spectra of all the hybrids. The ability to form cross-linked nanofibers of PVA using thermally stable and relatively inert silica could broaden the scope of use of these materials in various technologies.

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“…Liu et al [] reported a novel route for synthesizing mesoporous silica by calcination‐induced phase separation in a nonaqueous system. Initially, organic–inorganic hybrids are synthesized by the solvothermal polymerization of polyvinyl alcohol (PVAL) with TEOS in dimethyl sulfoxide.…”

Section: Hsm Materialsmentioning

confidence: 99%

“…Formation process of mesoporous silica and carbon materials. Reproduced from [] with the permission of E lsevier.…”

Section: Hsm Materialsmentioning

confidence: 99%

Preparation and applications of hybrid organic–inorganic monoliths: A review

Zhu

Row

2012

J of Separation Science

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This review presents an overview of the properties of hybrid organic–inorganic monolithic materials and summarizes the recent developments in the preparation and applications of these hybrid monolithic materials. Hybrid monolithic materials with porosities, surface functionalities, and fast dynamic transport have developed rapidly, and have been used in a wide range of applications owing to the low cost, good stability, and excellent performance. Basically, these materials can be divided into two major types according to the chemical composition: hybrid silica‐based monolith (HSM) and hybrid polymer‐based monolith (HPM). Compared to the HPM, HSM monolith has been attracting most wide attentions, and it is commonly synthesized by the sol–gel process. The conventional preparation procedures of two type's hybrid organic–inorganic monoliths are addressed. Applications of hybrid organic–inorganic monoliths in optical devices, capillary microextraction (CME), capillary electrochromatography (CEC), high performance liquid chromatography (HPLC), and chiral separation are also reviewed.

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Phase separation of organic/inorganic hybrids induced by calcination: A novel route for synthesizing mesoporous silica and carbon materials

Cited by 17 publications

References 41 publications

SiC Nanowires with Tunable Hydrophobicity/Hydrophilicity and Their Application as Nanofluids

SiC Nanowires with Tunable Hydrophobicity/Hydrophilicity and Their Application as Nanofluids

Hybrid Silica–PVA Nanofibers via Sol–Gel Electrospinning

Preparation and applications of hybrid organic–inorganic monoliths: A review

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