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

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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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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Evaluation of Efficiency of Polymerization, Surface Roughness, Porosity and Adaptation of Flowable and Sculptable Bulk Fill Composite Resins

Molecules ◽

10.3390/molecules26175202 ◽

2021 ◽

Vol 26 (17) ◽

pp. 5202

Author(s):

Elizabeta Gjorgievska ◽

Daniel S. Oh ◽

Daewon Haam ◽

Dragana Gabric ◽

Nichola J. Coleman

Keyword(s):

Surface Roughness ◽

Morphometric Analysis ◽

High Viscosity ◽

Composite Resins ◽

Force Microscopy ◽

Low Viscosity ◽

Atomic Force ◽

Afm Analysis ◽

Lower Porosity ◽

Thick Layers

A new category of commercial bulk fill composite resins (CRs) enables the placement of 4-mm-thick layers as an alternative to the traditional time-consuming incremental technique. The purpose of the present study was to compare the efficiency of the polymerization, adaptation and porosity of two high-viscosity ‘sculptable’ bulk fill CRs (Filtek™ Bulk Fill (3M™ ESPE, St. Paul, MN, USA) and Tetric EvoCeram® Bulk Fill (Ivoclar Vivadent AG, Schwan, Liechtenstein)) and two low-viscosity ‘flowable’ bulk fill CRs (SureFil® SDR™ flow (Dentsply Sirona, Charlotte, NC, USA) and Tetric EvoFlow® Bulk Fill (Ivoclar Vivadent AG, Schaan, Liechtenstein)). Cylindrical samples of the bulk fill CRs (4 mm height × 10 mm diameter) were analyzed by Fourier-transform infrared spectroscopy (FTIR) and atomic force microscopy (AFM). Additionally, occlusal cavities were prepared in twelve extracted human molars and restored with the bulk fill CRs (n = 3 for each CR). The adaptation and porosity of the bulk fill CRs were evaluated by X-ray microcomputed tomography (µCT) with a 3D morphometric analysis, and the adaptation was also analyzed by scanning electron microscopy (SEM) on longitudinal vestibulo-oral sections of the restored teeth. The AFM analysis demonstrated that the surface roughness of the SureFil® SDR™ flow was higher than that of the Tetric EvoFlow® Bulk Fill and that the surface roughness of Filtek™ Bulk Fill was higher than that of Tetric EvoCeram® Bulk Fill. µCT and SEM confirmed that the flowable bulk fill CRs had excellent adaptation to the cavity walls. The 3D morphometric analysis showed the highest and lowest degrees of porosity in Filtek™ Bulk Fill and Tetric EvoFlow® Bulk Fill, respectively. In general, the flowable bulk fill CRs exhibited better adaptation, a higher efficiency of polymerization and lower porosity than the sculptable materials.

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Description of Thermochromic Offset Prints Morphologies Depending on Printing Substrate

Applied Sciences ◽

10.3390/app10228095 ◽

2020 ◽

Vol 10 (22) ◽

pp. 8095

Author(s):

Mirela Rožić ◽

Nikola Šegota ◽

Marina Vukoje ◽

Rahela Kulčar ◽

Suzana Šegota

Keyword(s):

Atomic Force Microscopy ◽

Chemical Properties ◽

Recycled Paper ◽

Paper Surface ◽

Dimensional Changes ◽

Force Microscopy ◽

Atomic Force ◽

Afm Analysis ◽

Roughened Surface ◽

Paper Structure

In this study, the influence of physio-chemical properties of four printing substrates, fibrous papers (filter, bulky, recycled), and polymer film (synthetic paper) on the size of the thermochromic (TC) prints microcapsules was investigated. Results indicate that interaction between thermochromic ink and printing substrate determine the print morphology, i.e., porosity and roughness of printing substrate affect dimensions of TC microcapsules of resulting prints, while ink adhesion affects dimensional changes during heating–cooling cycle. Atomic force microscopy (AFM) analysis showed that microcapsules of the prints, on the surface of the smoothest synthetic paper, possess the smallest diameter and height, while, on the most porous and the most roughened surface of F paper, the microcapsules of the prints possess the highest diameter and height. By increasing the temperature to 40 °C, the biggest changes in the shape of the microcapsules (increase in height and decrease in diameter) were obtained using the surface of the hydrophilic filter paper. While using the recycled paper surface, the situation is opposite; the height and diameter of the microcapsules are reduced, and the microcapsules penetrate deeper into the paper structure (due to optimum adhesion). On the bulky paper surfaces, which are more hydrophobic than recycled paper (higher interfacial tension), the increase of temperature does not cause any significant changes in the shape and position of the microcapsules. The same behavior is observed using hydrophobic non-porous synthetic paper.

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

MRS Proceedings ◽

10.1557/proc-633-a13.51 ◽

2000 ◽

Vol 633 ◽

Cited By ~ 1

Author(s):

Y.C. Sui ◽

J.A. González-León ◽

A. Bermùdez ◽

D.R. Acosta ◽

J. Feuchtwanger ◽

...

Keyword(s):

Carbon Nanotubes ◽

Chemical Properties ◽

Wall Structure ◽

Anodized Aluminum ◽

Anodized Aluminum Oxide ◽

Force Microscopy ◽

Work Related ◽

Atomic Force ◽

Physico Chemical ◽

Alumina Oxide

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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Effect of whitening dentifrices on surface roughness of dental nanofiller-based composites. Stereomycroscopy and AFM analysis

Brazilian Dental Science ◽

10.14295/bds.2016.v19i3.1271 ◽

2016 ◽

Vol 19 (3) ◽

pp. 65

Author(s):

Rafaela Yoshie Oliveira Kinoshita ◽

Ricardo Sgura ◽

Mariana Cavalcante Reis ◽

Milton Satoiuqui Masuda ◽

Paulo Sérgio Lopes Prazeres ◽

...

Keyword(s):

Surface Roughness ◽

Hybrid Composites ◽

Dental Composites ◽

Average Roughness ◽

Parametric Test ◽

Force Microscopy ◽

Tukey Test ◽

Atomic Force ◽

Afm Analysis

<p><strong>Objective</strong>: the aim of this study was to assess the effects of whitening dentifrices on the surface roughness of three commercial nanofiller-based composite. <strong>Material and Methods</strong>: two optical analyses were performed: stereomicroscopy and atomic force microscopy (AFM). Disks (8.0 diam. x 2.0 mm thick.) of the nanocomposite Z350 (3M ESPE) and two nano-hybrid composites (EsthetXHD, Dentsply and Premisa, Kerr) were submitted to <em>in vitro</em> brushing (1000 cycles) with three whitening dentifrices (Colgate Luminous White, Oral-B 3D White e Close-Up Diamond Attraction) and a control (Colgate Total12). The results were analyzed by stereomicroscopy and rated according to the following criteria: 0 – no observed roughness, 1 – average roughness, 2 – great roughness. Data was submitted to Kruskall-Wallis non-parametric test followed by Tukey test (p = 0.05). Z350 specimens were assessed by AFM. <strong>Results</strong>: the surface roughness of composites brushed with whitening dentifrices was statistically higher than the roughness found in specimens brushed with conventional dentifrice. AFM analyses showed that, at a submicrometric scale, there was an increase in the number of peaks and irregularities in specimens brushed with whitening dentifrices. <strong>Conclusion</strong>: Whitening dentifrices may have an impact on the longevity of dental composites by an increase in its roughness. It is strongly recommended that clinicians guide their patients, warning them about the risks and consequences of their use.</p><p> </p><p><strong>Keywords</strong></p><p>Abrasion; Dentifrices; Composites resin; Roughness; Whitening; Abrasive.</p>

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Surface roughness measurements of vanadium-contaminated fluidized cracking catalysts by atomic force microscopy

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100166798 ◽

1996 ◽

Vol 54 ◽

pp. 866-867

Author(s):

H. Kinney ◽

M.L. Occelli ◽

S.A.C. Gould

Keyword(s):

Surface Roughness ◽

Zeolite Y ◽

Atomic Level ◽

Microporous Structure ◽

Contact Mode ◽

Force Microscopy ◽

Atomic Force ◽

Before And After ◽

Roughness Measurements ◽

Cracking Catalysts

For this study we have used a contact mode atomic force microscope (AFM) to study to topography of fluidized cracking catalysts (FCC), before and after contamination with 5% vanadium. We selected the AFM because of its ability to well characterize the surface roughness of materials down to the atomic level. It is believed that the cracking in the FCCs occurs mainly on the catalysts top 10-15 μm suggesting that the surface corrugation could play a key role in the FCCs microactivity properties. To test this hypothesis, we chose vanadium as a contaminate because this metal is capable of irreversibly destroying the FCC crystallinity as well as it microporous structure. In addition, we wanted to examine the extent to which steaming affects the vanadium contaminated FCC. Using the AFM, we measured the surface roughness of FCCs, before and after contamination and after steaming.We obtained our FCC (GRZ-1) from Davison. The FCC is generated so that it contains and estimated 35% rare earth exchaged zeolite Y, 50% kaolin and 15% binder.

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Brittle Behaviour in Aspirin Crystals: Evidence of Spalling Fracture

10.26434/chemrxiv.13238708.v1 ◽

2020 ◽

Author(s):

Benjamin P. A. Gabriele ◽

Craig J. Williams ◽

Douglas Stauffer ◽

Brian Derby ◽

Aurora J. Cruz-Cabeza

Keyword(s):

Surface Roughness ◽

Atomic Force Microscopy ◽

Single Crystals ◽

Spalling Fracture ◽

Force Microscopy ◽

Atomic Force ◽

Afm Imaging

<div> <div> <div> <p>Single crystals of aspirin form I were cleaved and indented on their dominant face. Upon inspection, it was possible to observe strongly anisotropic shallow lateral cracks due to the extreme low surface roughness after cleavage. Atomic Force Microscopy (AFM) imaging showed spalling fractures nucleating from the indent corners, forming terraces with a height of one or two interplanar spacings d100. The formation of such spalling fractures in aspirin was rationalised using basic calculations of attachment energies, showing how (100) layers are poorly bonded when compared to their relatively higher intralayer bonding. An attempt at explaining the preferential propagation of these fractures along the [010] direction is discussed. </p> </div> </div> </div>

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Brittle Behaviour in Aspirin Crystals: Evidence of Spalling Fracture

10.26434/chemrxiv.13238708 ◽

2020 ◽

Author(s):

Benjamin P. A. Gabriele ◽

Craig J. Williams ◽

Douglas Stauffer ◽

Brian Derby ◽

Aurora J. Cruz-Cabeza

Keyword(s):

Surface Roughness ◽

Atomic Force Microscopy ◽

Single Crystals ◽

Spalling Fracture ◽

Force Microscopy ◽

Atomic Force ◽

Afm Imaging

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Assessing the Functional Properties of TiZr Nanotubular Structures for Biomedical Applications, through Nano-Scratch Tests and Adhesion Force Maps

Molecules ◽

10.3390/molecules26040900 ◽

2021 ◽

Vol 26 (4) ◽

pp. 900

Author(s):

Maria Vardaki ◽

Aida Pantazi ◽

Ioana Demetrescu ◽

Marius Enachescu

Keyword(s):

Surface Roughness ◽

Functional Properties ◽

Bacterial Adhesion ◽

Biomedical Applications ◽

Adhesion Force ◽

Roughness Parameters ◽

Force Microscopy ◽

Atomic Force ◽

The Mean ◽

Scratch Tests

In this work we present the results of a functional properties assessment via Atomic Force Microscopy (AFM)-based surface morphology, surface roughness, nano-scratch tests and adhesion force maps of TiZr-based nanotubular structures. The nanostructures have been electrochemically prepared in a glycerin + 15 vol.% H2O + 0.2 M NH4F electrolyte. The AFM topography images confirmed the successful preparation of the nanotubular coatings. The Root Mean Square (RMS) and average (Ra) roughness parameters increased after anodizing, while the mean adhesion force value decreased. The prepared nanocoatings exhibited a smaller mean scratch hardness value compared to the un-coated TiZr. However, the mean hardness (H) values of the coatings highlight their potential in having reliable mechanical resistances, which along with the significant increase of the surface roughness parameters, which could help in improving the osseointegration, and also with the important decrease of the mean adhesion force, which could lead to a reduction in bacterial adhesion, are providing the nanostructures with a great potential to be used as a better alternative for Ti implants in dentistry.

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