Synthesis of Asymmetric Inorganic/Polymer Nanocomposite Particles via Localized Substrate Surface Modification and Miniemulsion Polymerization

Langmuir ◽  
2008 ◽  
Vol 24 (3) ◽  
pp. 606-608 ◽  
Author(s):  
Weili Qiang ◽  
Yilong Wang ◽  
Ping He ◽  
Hong Xu ◽  
Hongchen Gu ◽  
...  
Keyword(s):  
Surface Modification ◽  
Substrate Surface ◽  
Miniemulsion Polymerization ◽  
Polymer Nanocomposite ◽  
Inorganic Polymer ◽  
Nanocomposite Particles

Controlling bubble density in MWNT/polymer nanocomposite foams by MWNT surface modification

2012 ◽  
Vol 72 (2) ◽  
pp. 190-196 ◽  
Author(s):  
Limeng Chen ◽  
Behic K. Goren ◽  
Rahmi Ozisik ◽  
Linda S. Schadler
Keyword(s):  
Surface Modification ◽  
Polymer Nanocomposite ◽  
Nanocomposite Foams ◽  
Bubble Density

scholarly journals Assessment of Titanate Nanolayers in Terms of Their Physicochemical and Biological Properties

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 806
Author(s):  
Michalina Ehlert ◽  
Aleksandra Radtke ◽  
Katarzyna Roszek ◽  
Tomasz Jędrzejewski ◽  
Piotr Piszczek
Keyword(s):  
Surface Modification ◽  
Substrate Surface ◽  
Biological Properties ◽  
Structure Characterization ◽  
Porous Coating ◽  
Apatite Formation ◽  
Sem Images ◽  
Energy Dispersion Spectroscopy ◽  
X Ray

The surface modification of titanium substrates and its alloys in order to improve their osseointegration properties is one of widely studied issues related to the design and production of modern orthopedic and dental implants. In this paper, we discuss the results concerning Ti6Al4V substrate surface modification by (a) alkaline treatment with a 7 M NaOH solution, and (b) production of a porous coating (anodic oxidation with the use of potential U = 5 V) and then treating its surface in the abovementioned alkaline solution. We compared the apatite-forming ability of unmodified and surface-modified titanium alloy in simulated body fluid (SBF) for 1–4 weeks. Analysis of the X-ray diffraction patterns of synthesized coatings allowed their structure characterization before and after immersing in SBF. The obtained nanolayers were studied using Raman spectroscopy, diffuse reflectance infrared Fourier transform spectroscopy (DRIFT), and scanning electron microscopy (SEM) images. Elemental analysis was carried out using X-ray energy dispersion spectroscopy (SEM EDX). Wettability and biointegration activity (on the basis of the degree of integration of MG-63 osteoblast-like cells, L929 fibroblasts, and adipose-derived mesenchymal stem cells cultured in vitro on the sample surface) were also evaluated. The obtained results proved that the surfaces of Ti6Al4V and Ti6Al4V covered by TiO2 nanoporous coatings, which were modified by titanate layers, promote apatite formation in the environment of body fluids and possess optimal biointegration properties for fibroblasts and osteoblasts.

Biocompatible Ceramic-Biopolymer Coatings Obtained by Electrophoretic Deposition on Electron Beam Structured Titanium Alloy Surfaces

2016 ◽  
Vol 879 ◽  
pp. 1552-1557
Author(s):  
C. Ramskogler ◽  
L. Cordero ◽  
Fernando Warchomicka ◽  
A.R. Boccaccini ◽  
Christof Sommitsch
Keyword(s):  
Titanium Alloy ◽  
Surface Modification ◽  
Electron Beam ◽  
Electrophoretic Deposition ◽  
Composite Coatings ◽  
Substrate Surface ◽  
3D Structure ◽  
Titania Nanoparticles ◽  
Structured Surfaces ◽  
Major Interest

An area of major interest in biomedical engineering is currently the development of improved materials for medical implants. Research efforts are being focused on the investigation of surface modification methods for metallic prostheses due to the fundamental bioinert character of these materials and the possible ion release from their surfaces, which could potentially induce the interfacial loosening of devices after implantation. Electron beam (EB) structuring is a novel technique to control the surface topography in metals. Electrophoretic deposition (EPD) offers the feasibility to deposit at room temperature a variety of materials on conductive substrates from colloidal suspensions under electric fields. In this work single layers of chitosan composite coatings containing titania nanoparticles (n-TiO2) were deposit by EPD on electron beam (EB) structured Ti6Al4V titanium alloy. Surface structures were designed following different criteria in order to develop specific topography on the Ti6Al4V substrate. n-TiO2 particles were used as a model particle in order to demonstrate the versatility of the proposed technique for achieving homogenous chitosan based coatings on structured surfaces. A linear relation between EPD time and deposition yield on different patterned Ti6Al4V surfaces was determined under constant voltage conditions, obtaining homogeneous EPD coatings which replicate the 3D structure (pattern) of the substrate surface. The present results show that a combination of both techniques can be considered a promising surface modification approach for metallic implants, which should lead to improved interaction between the implant surface and the biological environment for orthopaedic applications.

Synthesis of SiO2/Polystyrene Nanocomposite Particles via Miniemulsion Polymerization

Langmuir ◽  
2005 ◽  
Vol 21 (6) ◽  
pp. 2124-2128 ◽  
Author(s):  
Sheng-Wen Zhang ◽  
Shu-Xue Zhou ◽  
Yu-Ming Weng ◽  
Li-Min Wu
Keyword(s):  
Miniemulsion Polymerization ◽  
Nanocomposite Particles

Facile Fabrication of Inorganic/Polymer Janus Microspheres by Miniemulsion Polymerization

2010 ◽  
Vol 39 (3) ◽  
pp. 206-207 ◽  
Author(s):  
Jianan Zhang ◽  
Mingyuan Wu ◽  
Qingyun Wu ◽  
Jianjun Yang ◽  
Nannan Liu ◽  
...  
Keyword(s):  
Miniemulsion Polymerization ◽  
Inorganic Polymer ◽  
Facile Fabrication

scholarly journals Surface modification as a technique to improve inter-layer bonding strength in 3D printed cementitious materials

2019 ◽  
Vol 4 ◽  
pp. 33-38 ◽  
Author(s):  
Jolien Van Der Putten ◽  
Geert De Schutter ◽  
Kim Van Tittelboom
Keyword(s):  
Surface Roughness ◽  
Surface Modification ◽  
Bonding Strength ◽  
Substrate Surface ◽  
Cementitious Materials ◽  
Degree Of Hydration ◽  
Custom Made ◽  
Wire Brushing ◽  
Modification Technique ◽  
3D Printed

The structural capacity of 3D printed components mainly depends on the inter-layer bonding strength between the different layers. This bond strength is affected by many parameters (e.g. moisture content of the substrate, time gap, surface roughness,..) and any mismatch in properties of the cementitious material may lead to early failure. A common technique to improve inter-layer bonding strength between a substrate and a newly added layer is modifying the substrate surface. For the purpose of this research, a custom-made 3D printing apparatus is used to simulate the printing process and layered specimens with a different delay time (0 and 30 minutes) are manufactured with different surface modification techniques (wire brushing, addition of sand or cement and moisturizing substrate layer). The surface roughness was measured and the effect of the modification technique on the inter-layer-bonding strength was investigated. Results showed that the most effective way to increase the inter-layer bonding is increasing the surface roughness by a comb. This creates a kind of interlock system that will provide a higher inter-layer strength. The compressive strength is most influenced by the addition of cement, where the changing W/C-ratio will create a higher degree of hydration and consequently a higher strength.

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