Silica Nanotubes by Templated Thermolysis of Silicon Tetraacetate

Chen, Xin; Berger, Andreas; Ge, Mingqiao; Hopfe, S.; Dai, Ning; Gösele, U.; Schlecht, Sabine; Steinhart, Martin

doi:10.1021/cm200709m

Cited by 10 publications

(9 citation statements)

References 20 publications

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“…Due to differences in quantum mechanical parameters of electron and phonon transport [65], it has been theoretically shown that nanowires of certain alloys can be made to have good electronic conduction with decreased thermal conduction [66], showing good potential for high performance thermoelectric materials [67]. Some microscope photographs of nanorods, nanowires, nanoribbons, nanobelts, nanotubes, and hierarchical nanostructures are shown in figure 3 [68][69][70][71][72][73][74][75][76][77]. (a) Nanowires [72], (b) nanorods [73] , (c) nanotubes [74], (d) nanobelts [75], (e) nanoribbons [76], and (f) hierarchical nanostructures [77].…”

Section: One Dimensional (1d)mentioning

confidence: 99%

“…Some microscope photographs of nanorods, nanowires, nanoribbons, nanobelts, nanotubes, and hierarchical nanostructures are shown in figure 3 [68][69][70][71][72][73][74][75][76][77]. (a) Nanowires [72], (b) nanorods [73] , (c) nanotubes [74], (d) nanobelts [75], (e) nanoribbons [76], and (f) hierarchical nanostructures [77]. Reprinted by permission of ACS Publishers.…”

Section: One Dimensional (1d)mentioning

confidence: 99%

See 1 more Smart Citation

Recent development in 2D materials beyond graphene

Gupta

Thangavel

Seal

2015

Progress in Materials Science

1,300

747

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Section: One Dimensional (1d)mentioning

confidence: 99%

Section: One Dimensional (1d)mentioning

confidence: 99%

Recent development in 2D materials beyond graphene

Gupta

Thangavel

Seal

2015

Progress in Materials Science

1,300

747

View full text Add to dashboard Cite

“…To this end, nanotubes made of various materials such as carbon, gold, silver, silica, other metals, and polymers have fetched a great deal of interest because of their remarkable physicochemical properties and potential wide ranging applicability. − Silica is one of the most studied materials to produce nanotubes because of its inert nature, and ease of surface functionalization. − Moreover, the mesoporous nature of such silica nanotubes make them an extremely important candidate for industrial use as catalyst support. Among the various methods available for the production of nanotubes, the template method has been proven to be versatile and inexpensive technique .…”

Section: Introductionmentioning

confidence: 99%

Self-Assembly of Peptide-Amphiphile Forming Helical Nanofibers and in Situ Template Synthesis of Uniform Mesoporous Single Wall Silica Nanotubes

et al. 2013

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A lysine based peptide amphiphile (PA) is designed and synthesized for efficient water immobilization. The PA with a minimum gelation concentration (MGC) of 1% w/v in water shows prolonged stability and can also efficiently immobilize aqueous mixtures of some other organic solvents. The presence of a free amine induced pH dependency of the gelation as the PA could form hydrogel at a pH range of 1-8 but failed to do so above that pH. Various spectroscopic and microscopic experiments such as steady state fluorescence, NMR, IR, CD, and FESEM reveal the presence of hydrophobic interaction, hydrogen bond, and π-π stacking interaction in the self-assembly process. The self-aggregation has been correlated with the design of the molecule to show the involvement of supramolecular forces and the hierarchical pathway. While the L analogue formed left-handed helical nanofibers, the other enantiomer showed opposite helicity. Interestingly the equimolar mixture of the isomers failed to form any fibrous aggregate. Although fibers formed at a subgel concentration, no helical nature was observed at this stage. The length and thickness of the fibers increased with increase in the gelator concentration. The nanofibers formed by the gelator are used as a template to prepare mesoporous single wall silica nanotubes (SWSNTs) in situ in plain water without the requirement of any organic solvent as well as any external hydrolyzing agent. The SWSNTs formed are open at both ends, are few micrometers in length, and have an average diameter of ~10 nm. The BET isotherm showed a type IV hysteresis loop suggesting mesoporous nature of the nanotubes.

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“…The nanoporous layer can have aspect ratios (pore diameter: pore length) up to 1:1000. Thus, nanoporous alumina is a good template for the production of nanostructures,3–5 including nanotubes or nanowires, and is also considered as an ideal material for drug delivery applications 6, 7. By reducing the voltage in defined steps at the end of the production process, the porous alumina layer can also be lifted from the underlying aluminum 8.…”

Section: Introductionmentioning

confidence: 99%

Self‐supporting nanoporous alumina membranes as substrates for hepatic cell cultures

Hoess

Thormann

Friedmann

et al. 2012

J Biomedical Materials Res

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Membranes made from nanoporous alumina exhibit interesting properties for their use in biomedical research. They show high porosity and the pore diameters can be easily adjusted in a reproducible manner. Nanoporous alumina membranes are thus ideal substrates for the cultivation of polar cells (e.g., hepatocytes) or the establishment of indirect co-cultures. The porous nature of the material allows supply of nutrients to both sides of adherent cells and the exchange of molecules across the membrane. However, it is well-known that surface features in the nanometer range affect cellular behavior. In this study, the response of HepG2 cells to nanoporous alumina membranes with three different pore diameters, ranging from 50 to 250 nm, has been evaluated. The cellular interactions with the nanoporous materials were assessed by investigating cell adhesion, morphology, and proliferation. Cell functionality was measured by means of albumin production. The membranes supported good cell adhesion and spreading. Compared to tissue culture plastic, the cells on the porous substrates developed distinct focal adhesion sites and actin stress fibers. Additionally, electron microscopical investigations revealed the penetration of cellular extensions into pores with diameters bigger than 200 nm. Furthermore, cell proliferation significantly increased with an increase in pore diameter, whereas the albumin production followed a reverse trend. Thus, it seems to be possible to direct cellular behavior of HepG2 cells growing on nanoporous alumina by changing the pore diameter of the material. Hence, nanoporous alumina membranes can be useful culture substrates to develop new approaches in the field of liver tissue engineering.

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Silica Nanotubes by Templated Thermolysis of Silicon Tetraacetate

Cited by 10 publications

References 20 publications

Recent development in 2D materials beyond graphene

Recent development in 2D materials beyond graphene

Self-Assembly of Peptide-Amphiphile Forming Helical Nanofibers and in Situ Template Synthesis of Uniform Mesoporous Single Wall Silica Nanotubes

Self‐supporting nanoporous alumina membranes as substrates for hepatic cell cultures

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