Anodized Aluminum Oxide Films as Nanostructured Template for the Grow of Carbon Nanotubes

AbstractA summary of our recent work related to the growth of carbon nanotubes (CNTs) inside the pores of anodized alumina oxide (AAO) films is presented. The surface topography of the AAO film was studied by atomic force microscopy, while the internal pore structure of the AOO templates was concluded from the shape of the CNTs obtained. The effect of the different experimental approaches and of the anodization voltage value on the features of the pores and CNTs is also discussed, as well as the catalytic effect in the acetylene pyrolysis of the Co particles and internal alumina walls. The CNTs wall structure observed by HRTEM and its implication on some physico-chemical properties of the CNTs are also presented.

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LIPSS Structures Induced on Graphene-Polystyrene Composite

Materials ◽

10.3390/ma12213460 ◽

2019 ◽

Vol 12 (21) ◽

pp. 3460 ◽

Cited By ~ 4

Author(s):

Dominik Fajstavr ◽

Klára Neznalová ◽

Václav Švorčík ◽

Petr Slepička

Keyword(s):

Chemical Properties ◽

Laser Pulses ◽

Periodic Pattern ◽

Krypton Fluoride ◽

Periodic Surface ◽

Laser Modification ◽

Force Microscopy ◽

Periodic Surface Structure ◽

Atomic Force ◽

Physico Chemical

A laser induced periodic surface structure (LIPSS) on graphene doped polystyrene was prepared by the means of a krypton fluoride (KrF) laser with the wavelength of 248 nm and precisely desired physico-chemical properties were obtained for the structure. Surface morphology after laser modification of polystyrene (PS) doped with graphene nanoplatelets (GNP) was studied. Laser fluence values of modifying laser light varied between 0–40 mJ·cm−2 and were used on polymeric PS substrates doped with 10, 20, 30, and 40 wt. % of GNP. GNP were incorporated into PS substrate with the solvent casting method and further laser modification was achieved with the same amount of laser pulses of 6000. Formed nanostructures with a periodic pattern were examined by atomic force microscopy (AFM). The morphology was also studied with scanning electron microscopy SEM. Laser irradiation resulted in changes of chemical composition on the PS surface, such as growth of oxygen concentration. This was confirmed with energy-dispersive X-ray spectroscopy (EDS).

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Preparation of Giant Unilamellar Vesicles and Solid Supported Bilayer from Large Unilamellar Vesicles: Model Biological Membranes

Journal of Surface Science and Technology ◽

10.18311/jsst/2016/7753 ◽

2017 ◽

Vol 32 (3-4) ◽

pp. 85 ◽

Cited By ~ 1

Author(s):

Amrita Basu ◽

Pabitra Maity ◽

Prasanta Karmakar ◽

Sanat Karmakar

Keyword(s):

Chemical Properties ◽

Giant Unilamellar Vesicles ◽

Unilamellar Vesicles ◽

Force Microscopy ◽

Atomic Force ◽

Large Unilamellar Vesicles ◽

Physico Chemical ◽

Micron Size ◽

Planar Membranes ◽

Extrusion Method

Giant Unilamellar Vesicles (GUV) and supported planar membranes are excellent model biological systems for studying the structure and functions of membranes. We have prepared GUV from Large Unilamellar Vesicles (LUV) using electroformation and Supported planar Lipid Bilayer (SLB) by vesicle fusion method. LUV was prepared using an extrusion method and was characterized using Dynamic Light Scattering (DLS) and zeta potential measurements. The techniques for obtaining GUV as well as SLB from LUV have been demonstrated. We have directly observed the formation of GUV under phase contrast microscopy. This study will provide some insights into the physico-chemical properties of both nano and micron size vesicles. We believe that this method could be extremely useful for reconstituting various bio-molecules in GUV. We have presented one example where an antimicrobial peptide NK-2 was reconstituted in GUV prepared from LUV. SLB formation was monitored and characterized using Atomic Force Microscopy (AFM).

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Electrospun Combination of Peppermint Oil and Copper Sulphate with Conducive Physico-Chemical properties for Wound Dressing Applications

Polymers ◽

10.3390/polym11040586 ◽

2019 ◽

Vol 11 (4) ◽

pp. 586 ◽

Cited By ~ 7

Author(s):

Saravana Jaganathan ◽

Mohan Mani ◽

Ahmad Khudzari

Keyword(s):

Surface Roughness ◽

Copper Sulphate ◽

Wound Dressing ◽

Fiber Diameter ◽

Blood Compatibility ◽

Chemical Properties ◽

Force Microscopy ◽

Atomic Force ◽

Physico Chemical ◽

Afm Analysis

The ultimate goal in tissue engineering is to fabricate a scaffold which could mimic the native tissue structure. In this work, the physicochemical and biocompatibility properties of electrospun composites based on polyurethane (PU) with added pepper mint (PM) oil and copper sulphate (CuSO4) were investigated. Field Emission Electron microscope (FESEM) study depicted the increase in mean fiber diameter for PU/PM and decrease in fiber diameter for PU/PM/CuSO4 compared to the pristine PU. Fourier transform infrared spectroscopy (FTIR) analysis revealed the formation of a hydrogen bond for the fabricated composites as identified by an alteration in PU peak intensity. Contact angle analysis presented the hydrophobic nature of pristine PU and PU/PM while the PU/PM/CuSO4 showed hydrophilic behavior. Atomic force microscopy (AFM) analysis revealed the increase in the surface roughness for the PU/PM while PU/PM/CuSO4 showed a decrease in surface roughness compared to the pristine PU. Blood compatibility studies showed improved blood clotting time and less toxic behavior for the developed composites than the pristine PU. Finally, the cell viability of the fabricated composite was higher than the pristine PU as indicated in the MTS assay. Hence, the fabricated wound dressing composite based on PU with added PM and CuSO4 rendered a better physicochemical and biocompatible nature, making it suitable for wound healing applications.

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Nanomanipulation by atomic force microscopy of carbon nanotubes on a nanostructured surface

Surface Science ◽

10.1016/s0039-6028(03)00919-1 ◽

2003 ◽

Vol 543 (1-3) ◽

pp. 57-62 ◽

Cited By ~ 31

Author(s):

S. Decossas ◽

L. Patrone ◽

A.M. Bonnot ◽

F. Comin ◽

M. Derivaz ◽

...

Keyword(s):

Carbon Nanotubes ◽

Atomic Force Microscopy ◽

Nanostructured Surface ◽

Force Microscopy ◽

Atomic Force

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Effects of tip-nanotube interactions on atomic force microscopy imaging of carbon nanotubes

Nano Research ◽

10.1007/s12274-012-0203-8 ◽

2012 ◽

Vol 5 (4) ◽

pp. 235-247 ◽

Cited By ~ 13

Author(s):

Rouholla Alizadegan ◽

Albert D. Liao ◽

Feng Xiong ◽

Eric Pop ◽

K. Jimmy Hsia

Keyword(s):

Carbon Nanotubes ◽

Atomic Force Microscopy ◽

Microscopy Imaging ◽

Force Microscopy ◽

Atomic Force ◽

Atomic Force Microscopy Imaging

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In Situ Atomic Force Microscopy Tip-Induced Deformations and Raman Spectroscopy Characterization of Single-Wall Carbon Nanotubes

Nano Letters ◽

10.1021/nl3016347 ◽

2012 ◽

Vol 12 (8) ◽

pp. 4110-4116 ◽

Cited By ~ 13

Author(s):

P. T. Araujo ◽

N. M. Barbosa Neto ◽

H. Chacham ◽

S. S. Carara ◽

J. S. Soares ◽

...

Keyword(s):

Carbon Nanotubes ◽

Raman Spectroscopy ◽

Atomic Force Microscopy ◽

Single Wall Carbon Nanotubes ◽

Single Wall Carbon ◽

Force Microscopy ◽

Atomic Force

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Infrared Characterization of PMMA-SiO2 Hybrid Glasses Obtained by Sol-Gel Process

MRS Proceedings ◽

10.1557/proc-1278-s08-13 ◽

2010 ◽

Vol 1278 ◽

Author(s):

L.L. Díaz-Flores ◽

A. S. López Rodríguez ◽

P. SifuentesGallardo ◽

M.A. Hernàndez Rivera ◽

M.a Garnica Romo ◽

...

Keyword(s):

Sol Gel ◽

Chemical Properties ◽

Hybrid Coatings ◽

Force Microscopy ◽

Air Atmosphere ◽

Atomic Force ◽

Sol Gel Process ◽

Traditional Process ◽

And Chemical Properties

AbstractThis work is about the production of hybrid coatings of the system SiO2-PMMA (PMMA, polymethylmethacrylate). These materials have interesting mechanical and chemical properties useful for anticorrosive and wear resistance applications. SiO2-PMMA hybrids were obtained by the sol-gel traditional process, using tetraethylorthosilicate (TEOS) and methylmethacrylate (MMA) by Aldrich Co, as starting reagents. The SiO2:PMMA ratio was varied from 0:1 to about 1:1 at air atmosphere deposition. The coatings were obtained on acrylic sheets and silicon wafers. A diversity of coatings with chemical composition ranging from SiO2 and PMMA to obtain the SiO2-PMMA hybrids were obtained. Infrared (IR) and atomic force microscopy (AFM), were performed to determinate structural and morphological behavior.

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Stereocomplex electrospun fibers from high molecular weight of poly(L-lactic acid) and poly(D-lactic acid)

Journal of Polymer Engineering ◽

10.1515/polyeng-2019-0026 ◽

2020 ◽

Vol 40 (2) ◽

pp. 136-142 ◽

Cited By ~ 1

Author(s):

Homa Maleki ◽

Hossein Barani

Keyword(s):

Molecular Weight ◽

Lactic Acid ◽

Thermal Properties ◽

High Molecular Weight ◽

Chemical Properties ◽

Electrospun Fibers ◽

Scanning Calorimetry ◽

Force Microscopy ◽

Atomic Force ◽

Electrospinning Method

AbstractThe stereocomplex formation is a promising method to improve the properties of poly(lactide) (PLA)-based products due to the strong interaction of the side-by-side arrangement of the molecular chains. Recently, electrospinning method has been applied to prepare PLA stereocomplex, which is more convenient. The objective of the current study is to make stereocomplexed PLA nanofibers using electrospinning method and compare their properties and structures with pure poly(l-lactide) (PLLA) fibers. The stereocomplexed fibers were electrospun from a blend solution of high molecular weight PLLA and poly(d-lactide) (1:1 ratio). The morphology of the obtained electrospun fibers was examined by scanning electron microscopy (SEM) and atomic force microscopy (AFM). Differential scanning calorimetry was applied to study their thermal properties and crystallinity. Fourier transform infrared spectroscopy (FTIR) test was conducted on the samples to characterize their chemical properties. The SEM and AFM images indicated that smooth uniform fibers with a cylindrical structure were produced. Besides, the FTIR results and thermal properties confirmed that only stereocomplex crystallites formed in the resulting fibers via the electrospinning method.

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