Magnesium Coated Bioresorbable Phosphate Glass Fibres: Investigation of the Interface between Fibre and Polyester Matrices

Bioresorbable phosphate glass fibre reinforced polyester composites have been investigated as replacement for some traditional metallic orthopaedic implants, such as bone fracture fixation plates. However, composites tested revealed loss of the interfacial integrity after immersion within aqueous media which resulted in rapid loss of mechanical properties. Physical modification of fibres to change fibre surface morphology has been shown to be an effective method to improve fibre and matrix adhesion in composites. In this study, biodegradable magnesium which would gradually degrade to Mg2+in the human body was deposited via magnetron sputtering onto bioresorbable phosphate glass fibres to obtain roughened fibre surfaces. Fibre surface morphology after coating was observed using scanning electron microscope (SEM). The roughness profile and crystalline texture of the coatings were determined via atomic force microscope (AFM) and X-ray diffraction (XRD) analysis, respectively. The roughness of the coatings was seen to increase from40±1 nm to80±1 nm. The mechanical properties (tensile strength and modulus) of fibre with coatings decreased with increased magnesium coating thickness.

Download Full-text

Mechanical, degradation and cytocompatibility properties of magnesium coated phosphate glass fibre reinforced polycaprolactone composites

Journal of Biomaterials Applications ◽

10.1177/0885328214541302 ◽

2014 ◽

Vol 29 (5) ◽

pp. 675-687 ◽

Cited By ~ 6

Author(s):

Xiaoling Liu ◽

Muhammad S Hasan ◽

David M Grant ◽

Lee T Harper ◽

Andrew J Parsons ◽

...

Keyword(s):

Mechanical Properties ◽

Mass Loss ◽

Water Uptake ◽

Phosphate Glass ◽

Glass Fibre ◽

Mechanical Degradation ◽

Osteosarcoma Cell ◽

Ph Change ◽

Glass Fibre Reinforced ◽

Composite Samples

Retention of mechanical properties of phosphate glass fibre reinforced degradable polyesters such as polycaprolactone and polylactic acid in aqueous media has been shown to be strongly influenced by the integrity of the fibre/polymer interface. A previous study utilising ‘single fibre’ fragmentation tests found that coating with magnesium improved the fibre and matrix interfacial shear strength. Therefore, the aim of this study was to investigate the effects of a magnesium coating on the manufacture and characterisation of a random chopped fibre reinforced polycaprolactone composite. Short chopped strand non-woven phosphate glass fibre mats were sputter coated with degradable magnesium to manufacture phosphate glass fibre/polycaprolactone composites. The degradation behaviour (water uptake, mass loss and pH change of the media) of these polycaprolactone composites as well as of pure polycaprolactone was investigated in phosphate buffered saline. The Mg coated fibre reinforced composites revealed less water uptake and mass loss during degradation compared to the non-coated composites. The cations released were also explored and a lower ion release profile for all three cations investigated (namely Na+, Mg2+ and Ca2+) was seen for the Mg coated composite samples. An increase of 17% in tensile strength and 47% in tensile modulus was obtained for the Mg coated composite samples. Both flexural and tensile properties were investigated and a higher retention of mechanical properties was obtained for the Mg coated fibre reinforced composite samples up to 10 days immersion in PBS. Cytocompatibility study showed both composite samples (coated and non-coated) had good cytocompatibility with human osteosarcoma cell line.

Download Full-text

An Experimental Study on Irradiated Interface of Silicon

Himalayan Physics ◽

10.3126/hp.v9i01.40171 ◽

2020 ◽

pp. 72-79

Author(s):

Min Raj Lamsal

Keyword(s):

Mechanical Properties ◽

Experimental Study ◽

Surface Morphology ◽

Energy Loss ◽

Silicon Surface ◽

Target Surface ◽

Electronic Energy ◽

Electron Volt ◽

Atomic Force ◽

Induced Stress

Atomic Force Microscopic (AFM) studies of Mega electron-volt (MeV) ions irradiated silicon surface morphology has been studied to a ﬂuence of 5 x 108 ions/cm2. Interesting features of cracks of 50 nm in depth and 100 nm in width have been observed on the irradiated surface. The features seemed to have been caused by the irradiation-induced stress in the irradiated regions of the target surface. The observed feature of crack seems to be mainly due to the high electronic energy loss of the irradiated ions on the surface that induces the stress in it. It conﬁrms that the coarseness of the microstructure of a material directly affect the mechanical properties.

Download Full-text

Improved Mechanical Properties of Copoly(Phthalazinone Ether Sulphone)s Composites Reinforced by Multiscale Carbon Fibre/Graphene Oxide Reinforcements: A Step Closer to Industrial Production

Polymers ◽

10.3390/polym11020237 ◽

2019 ◽

Vol 11 (2) ◽

pp. 237 ◽

Cited By ~ 7

Author(s):

Nan Li ◽

Xiuxiu Yang ◽

Feng Bao ◽

Yunxing Pan ◽

Chenghao Wang ◽

...

Keyword(s):

Mechanical Properties ◽

Graphene Oxide ◽

Carbon Fibre ◽

Photoelectron Spectroscopy ◽

Fibre Surface ◽

Homogeneous Distribution ◽

Matrix Interface ◽

Atomic Force ◽

Hybrid Fibre ◽

Interlaminar Shear

The properties of carbon fibre (CF) reinforced composites rely heavily on the fibre-matrix interface. To enhance the interfacial properties of CF/copoly(phthalazinone ether sulfone)s (PPBES) composites, a series of multiscale hybrid carbon fibre/graphene oxide (CF/GO) reinforcements were fabricated by a multistep deposition strategy. The optimal GO loading in hybrid fibres was investigated. Benefiting from the dilute GO aqueous solution and repeated deposition procedures, CF/GO (0.5%) shows a homogeneous distribution of GO on the hybrid fibre surface, which is confirmed by scanning electron microscopy, atomic force microscope, and X-ray photoelectron spectroscopy, thereby ensuring that its PPBES composite possesses the highest interlaminar shear strength (91.5 MPa) and flexural strength (1886 MPa) with 16.0% and 24.1% enhancements, respectively, compared to its non-reinforced counterpart. Moreover, the incorporation of GO into the interface is beneficial for the hydrothermal ageing resistance and thermo-mechanical properties of the hierarchical composite. This means that a mass production strategy for enhancing mechanical properties of CF/PPBES by regulating the fiber-matrix interface was developed.

Download Full-text

Synthesis and Characterization of Amorphous Metallic Alloy Thin Films for MEMS Applications

MRS Proceedings ◽

10.1557/proc-806-mm8.1 ◽

2003 ◽

Vol 806 ◽

Cited By ~ 1

Author(s):

Senthil N Sambandam ◽

Shekhar Bhansali ◽

Venkat R. Bhethanabotla

Keyword(s):

Thin Films ◽

Mechanical Properties ◽

Surface Morphology ◽

X Ray Diffraction ◽

Micro Electro Mechanical Systems ◽

Force Microscopy ◽

Target Composition ◽

Atomic Force ◽

Deposition Parameters ◽

Afm Analysis

ABSTRACTMicrostructures of multi-component amorphous metallic glass alloys are becoming increasingly important due to their excellent mechanical properties and low coefficient of friction. In this work, thin films of Zr-Ti-Cu-Ni-Be have been deposited by DC magnetron sputtering in view of exploring their potential technological applications in fields such as Micro Electro Mechanical Systems (MEMS). Their structure, composition, surface morphology, mechanical properties viz., hardness and Young's modulus were analyzed using X-Ray Diffraction (XRD), Atomic Force Microscopy (AFM), Scanning Electron Microscopy (SEM) and Nanoindentation. Influence of the deposition parameters of sputtering pressure and power upon the composition and surface morphology of these films has been evidenced by SEM, and AFM analysis, showing that such a process yields very smooth films with target composition at low sputtering pressures. These studies are useful in understanding the multicomponent sputtering process.

Download Full-text

Physical attachment of fluorescent protein particles to atomic force microscopy probes in aqueous media: Implications for surface pH, fluorescence, and mechanical properties studies

Microscopy Research and Technique ◽

10.1002/jemt.20816 ◽

2009 ◽

pp. NA-NA ◽

Cited By ~ 1

Author(s):

Susana Moreno-Flores ◽

Radostina Georgieva ◽

Yu Xiong ◽

Kathryn Melzak ◽

Hans BÃ¤umler ◽

...

Keyword(s):

Mechanical Properties ◽

Atomic Force Microscopy ◽

Fluorescent Protein ◽

Aqueous Media ◽

Surface Ph ◽

Force Microscopy ◽

Atomic Force ◽

Protein Particles

Download Full-text

Tribo-Mechanical Properties of the Antimicrobial Low-Density Polyethylene (LDPE) Nanocomposite with Hybrid ZnO–Vermiculite–Chlorhexidine Nanofillers

Polymers ◽

10.3390/polym12122811 ◽

2020 ◽

Vol 12 (12) ◽

pp. 2811

Author(s):

Karla Čech Barabaszová ◽

Sylva Holešová ◽

Marianna Hundáková ◽

Alena Kalendová

Keyword(s):

Mechanical Properties ◽

Zinc Oxide ◽

Xrd Analysis ◽

Surface Topology ◽

Low Density Polyethylene ◽

Indentation Hardness ◽

Low Density ◽

X Ray Diffraction ◽

Force Microscopy ◽

Atomic Force

Materials made from low-density polyethylene (LDPE) in the form of packages or catheters are currently commonly applied medical devices. Antimicrobial LDPE nanocomposite materials with two types of nanofillers, zinc oxide/vermiculite (ZnO/V) and zinc oxide/vermiculite_chlorhexidine (ZnO/V_CH), were prepared by a melt-compounded procedure to enrich their controllable antimicrobial, microstructural, topographical and tribo-mechanical properties. X-ray diffraction (XRD) analysis and Fourier transform infrared spectroscopy (FTIR) revealed that the ZnO/V and ZnO/V_CH nanofillers and LDPE interacted well with each other. The influence of the nanofiller concentrations on the LDPE nanocomposite surface changes was studied through scanning electron microscopy (SEM), and the surface topology and roughness were studied using atomic force microscopy (AFM). The effect of the ZnO/V nanofiller on the increase in indentation hardness (HIT) was evaluated by AFM measurements and the Vickers microhardness (HV), which showed that as the concentration of the ZnO/V nanofiller increased, these values decreased. The ZnO/V and ZnO/V_CH nanofillers, regardless of the concentration in the LDPE matrix, slightly increased the average values of the friction coefficient (COF). The abrasion depths of the wear indicated that the LDPE_ZnO/V nanocomposite plates exhibited better wear resistance than LDPE_ZnO/V_CH. Higher HV and HIT microhardness values were measured for both nanofillers than the natural LDPE nanocomposite plate. Very positive antimicrobial activity against S. aureus and P. aeruginosa after 72 h was found for both nanofiller types.

Download Full-text

Mechanical Properties and Surface Morphology of Diamond-Like Carbon Films with SiNx Interlayer

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.723.515 ◽

2015 ◽

Vol 723 ◽

pp. 515-519

Author(s):

Qing Yun Chen ◽

Kai Min Shih ◽

Man Yi Duan ◽

Lie Lin Wang

Keyword(s):

Mechanical Properties ◽

Surface Morphology ◽

Indentation Test ◽

Deposition Process ◽

Industrial Applications ◽

Carbon Films ◽

Diamond Like Carbon ◽

Dc Magnetron Sputtering ◽

Force Microscopy ◽

Atomic Force

Diamond-like carbon (DLC) film has remarkable physical, mechanical, biomedical and tribological properties that make it attractive material for numerous industrial applications needs of advanced mechanical systems. In this study, deposition process of DLC films on Si (100) are performed by direct-current (DC) magnetron sputtering method. The effects of interlayer on the compositions, structures and mechanical properties of DLC films are studied. The scanning electron microscopy (SEM) and atomic force microscopy (AFM) studies reveal the creation of high uniform surface morphology and low roughness DLC films with SiNxinterlayer. For comparison, DLC films with different interlayers are also grown. The Raman spectra are analyzed in order to characterize the film compositions. Indentation test was performed to value the mechanical properties of DLC films. Raman, SEM, and AFM analyses are correlated with the mechanical properties of the DLC films.

Download Full-text

Effects of fibre-surface morphology on the mechanical properties of Porifera-inspired rubber-matrix composites

Applied Physics A ◽

10.1007/s00339-013-7637-z ◽

2013 ◽

Vol 111 (4) ◽

pp. 1031-1036 ◽

Cited By ~ 5

Author(s):

Parvez Alam ◽

Daniela Graf Stillfried ◽

Jessika Celli ◽

Martti Toivakka

Keyword(s):

Mechanical Properties ◽

Surface Morphology ◽

Fibre Surface ◽

Rubber Matrix ◽

Matrix Composites

Download Full-text

Morphology and AFM Spectroscopy of Irradiated Interface of Silicon

Nepal Journal of Science and Technology ◽

10.3126/njst.v14i2.10430 ◽

2014 ◽

Vol 14 (2) ◽

pp. 155-160

Author(s):

SK Lamichhane

Keyword(s):

Mechanical Properties ◽

Surface Morphology ◽

Energy Loss ◽

Target Surface ◽

Electronic Energy ◽

Detectable Level ◽

Silicon Surfaces ◽

Electron Volt ◽

Atomic Force ◽

Induced Stress

In covalent solids, more energetic irradiation sources are necessary to produce detectable level of damage. The atomic force microscopic (AFM) studies of mega electron-volt (MeV) ions irradiated silicon surfaces have been studied to a fluence of 5×108 ions cm-2 and surface morphology has been studied with AFM. Interesting features of cracks of ~ 50 nm in depth and ~ 100 nm in width have been observed on the irradiated surface. The features seemed to have been caused by the irradiation-induced stress in the irradiated regions of the target surface. The observed feature of cracks seems to be mainly due to the high electronic energy loss of the irradiated ions on the surface induces the stress in it. It confirms that the coarseness of the microstructure of a material directly affects the mechanical properties. DOI: http://dx.doi.org/10.3126/njst.v14i2.10430 Nepal Journal of Science and Technology Vol. 14, No. 2 (2013) 155-160

Download Full-text