Electric-Field-Oriented Growth of Long Hair-Like Silica Microfibrils and Derived Functional Monolithic Solids

Hu, Michael Z.; DePaoli, David W.; Kuritz, Tanya; Omatete, Ogbemi O.

doi:10.2174/1872210511666170420145704

Title: Electric-Field-Oriented Growth of Long Hair-Like Silica Microfibrils and Derived Functional Monolithic Solids

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Abstract

Background: Controlled self-assembly using molecules/nanoparticles as building block materials represents an important approach for nanofabrication.Method: We present a “bottom-up” fabrication approach to first grow a new class of inorganic (silica) long hair-like microfibrils or microwires and then to form monolithic solid pellet that contains parallel arrays of bundled microfibrils with a controlled orientation. During the sol-gel solution processing, reactive precursor species are utilized as molecular “building blocks” for the field-directed assembly growth of microfibrils driven by an electric field of pulsed direct current (dc) with controlled frequency.Results: We have demonstrated a novel reactive electrofibrilation process that combines an external field with a solid-phase nucleation and growth process which in principle has no limitation on the type of reactions (such as the one here that involves sol-gel reaction chemistry) and on materials compositions (such as the example silica oxide), thus will enable bulk production of long microfibrils of wide variety of inorganic materials (other oxides or metals). Furthermore, we have fabricated uniquely architectured monolithic solid materials containing aligned microfibrils by “wet press” of the in-situ grown microfibril structure in the electric field. The consolidated monolithic slabs (1 cm × 1 cm × 3 mm) have shown anisotropic properties and desirable retentionmore »« less

Authors:

Hu, Michael Z. ^[1]; DePaoli, David W. ^[1]; Kuritz, Tanya ^[1]; Omatete, Ogbemi O. ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Publication Date:: Mon Sep 11 00:00:00 EDT 2017

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1408658

Alternate Identifier(s):: OSTI ID: 1495991

Grant/Contract Number:: AC05-00OR22725

Resource Type:: Accepted Manuscript

Journal Name:: Recent Patents on Nanotechnology

Additional Journal Information:: Journal Volume: 11; Journal Issue: 3; Journal ID: ISSN 1872-2105

Publisher:: Bentham Science

Country of Publication:: United States

Language:: English

Subject:: 77 NANOSCIENCE AND NANOTECHNOLOGY

Citation Formats


                    Hu, Michael Z., DePaoli, David W., Kuritz, Tanya, and Omatete, Ogbemi O. Electric-Field-Oriented Growth of Long Hair-Like Silica Microfibrils and Derived Functional Monolithic Solids.  United States: N. p., 2017. 
Web.  doi:10.2174/1872210511666170420145704.

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                    Hu, Michael Z., DePaoli, David W., Kuritz, Tanya, & Omatete, Ogbemi O. Electric-Field-Oriented Growth of Long Hair-Like Silica Microfibrils and Derived Functional Monolithic Solids.  United States.  https://doi.org/10.2174/1872210511666170420145704

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                    Hu, Michael Z., DePaoli, David W., Kuritz, Tanya, and Omatete, Ogbemi O. Mon .  
"Electric-Field-Oriented Growth of Long Hair-Like Silica Microfibrils and Derived Functional Monolithic Solids".  United States.  https://doi.org/10.2174/1872210511666170420145704.  https://www.osti.gov/servlets/purl/1408658.

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@article{osti_1408658,

  title        = {Electric-Field-Oriented Growth of Long Hair-Like Silica Microfibrils and Derived Functional Monolithic Solids},

  author       = {Hu, Michael Z. and DePaoli, David W. and Kuritz, Tanya and Omatete, Ogbemi O.},

  abstractNote = {Background: Controlled self-assembly using molecules/nanoparticles as building block materials represents an important approach for nanofabrication.Method: We present a “bottom-up” fabrication approach to first grow a new class of inorganic (silica) long hair-like microfibrils or microwires and then to form monolithic solid pellet that contains parallel arrays of bundled microfibrils with a controlled orientation. During the sol-gel solution processing, reactive precursor species are utilized as molecular “building blocks” for the field-directed assembly growth of microfibrils driven by an electric field of pulsed direct current (dc) with controlled frequency.Results: We have demonstrated a novel reactive electrofibrilation process that combines an external field with a solid-phase nucleation and growth process which in principle has no limitation on the type of reactions (such as the one here that involves sol-gel reaction chemistry) and on materials compositions (such as the example silica oxide), thus will enable bulk production of long microfibrils of wide variety of inorganic materials (other oxides or metals). Furthermore, we have fabricated uniquely architectured monolithic solid materials containing aligned microfibrils by “wet press” of the in-situ grown microfibril structure in the electric field. The consolidated monolithic slabs (1 cm × 1 cm × 3 mm) have shown anisotropic properties and desirable retention of DNA molecule fragments, thus, could serve as a platform stationary-phase materials for future development of capillary electrochromatography for biomolecule separations.Conclusion: Electrical field-guided self-assembly is an effective approach in producing long (hair-like) ceramic microfibrils, which can be further used in consolidation fabrication of oriented structured ceramic monoliths with potential for capillary electrophoretic chromatography and other separations applications. This original work was recorded through a patent application to understand the fibril formation mechanism and its process.},

  doi          = {10.2174/1872210511666170420145704},

  journal      = {Recent Patents on Nanotechnology},

  number       = 3,

  volume       = 11,

  place        = {United States},

  year         = {Mon Sep 11 00:00:00 EDT 2017},

  month        = {Mon Sep 11 00:00:00 EDT 2017}

}

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