scholarly journals Organic surface modification and analysis of titania nanoparticles for self‐assembly in multiple layers

2020 ◽  
Vol 52 (12) ◽  
pp. 829-834
Author(s):  
Vasile‐Dan Hodoroaba ◽  
Steffi Rades ◽  
Patrizia Borghetti ◽  
Erik Ortel ◽  
Thomas Wirth ◽  
...  
Keyword(s):  
Surface Modification ◽  
Self Assembly ◽  
Titania Nanoparticles

scholarly journals Organic Surface Modification and Analysis of Titania Nanoparticles for Self-Assembly in Multiple Layers

2017 ◽  
Vol 23 (S1) ◽  
pp. 1872-1873
Author(s):  
Steffi Rades ◽  
Vasile-Dan Hodoroaba ◽  
Erik Ortel ◽  
Thomas Wirth ◽  
Patrizia Borghetti ◽  
...  
Keyword(s):  
Surface Modification ◽  
Self Assembly ◽  
Titania Nanoparticles

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.

scholarly journals Surface modification and adhesion improvement of polyester films

2013 ◽  
Vol 11 (1) ◽  
pp. 35-45 ◽  
Author(s):  
Aniello Cammarano ◽  
Giovanna Luca ◽  
Eugenio Amendola
Keyword(s):  
Free Energy ◽  
Surface Modification ◽  
Surface Free Energy ◽  
Self Assembly ◽  
Treatment Time ◽  
Solution Treatment ◽  
Film Surface ◽  
Critical Surface ◽  
Hydrolysis Time ◽  
Critical Surface Tension

AbstractFacile surface modification of polyester films was performed via chemical solutions treatment. Surface hydrolysis was carried out by means of sodium hydroxide solutions, leading to the formation of carboxylate groups. Three commercial polyester films of 100 μm in thickness were used in this work: AryLite™, Mylar™, and Teonex™, hydrolysis time being the main modification parameter. FTIR-ATR analysis, topography and contact angle (CA) measurements, surface free energy (SFE) and T-Peel adhesion tests were carried out to characterize the modified films. A quantitative estimate of the carboxylates surface coverage as a function of treatment time was obtained through a supramolecular approach, i.e. the ionic self-assembly of a tetracationic porphyrin chromophore onto the film surface. The surface free energy and critical surface tension of the hydrolyzed polyesters was evaluated by means of Zisman, Saito, Berthelot and Owens-Wendt methods. It was shown that NaOH solution treatment increases roughness, polarity and surface free energy of polymers. As a result, T-Peel strengths for modified Mylar™ and Teonex™ films were respectively 2.2 and 1.8 times higher than that for the unmodified films, whereas AryLite™ adhesion test failed.

scholarly journals Fabrication of Spherical Titania Inverse Opal Structures Using Electro-Hydrodynamic Atomization

Molecules ◽  
2019 ◽  
Vol 24 (21) ◽  
pp. 3905 ◽  
Author(s):  
Jong-Min Lim ◽  
Sehee Jeong
Keyword(s):  
Composite Structure ◽  
Self Assembly ◽  
Interstitial Site ◽  
Titania Nanoparticles ◽  
Face Centered Cubic ◽  
Inverse Opal ◽  
Uniform Size ◽  
Anatase Titania ◽  
Inverse Opal Structure ◽  
Fcc Structure

Spherical PS/HEMA opal structure and spherical titania inverse opal structure were fabricated by self-assembly of colloidal nanoparticles in uniform aerosol droplets generated with electro-hydrodynamic atomization method. When a solution of PS/HEMA nanoparticles with uniform size distribution was used, PS/HEMA nanoparticles self-assembled into a face-centered cubic (FCC) structure by capillary force with the evaporation of the solvent in aerosol droplet, resulting in a spherical opal structure. When PS/HEMA nanoparticles and anatase titania nanoparticles were dispersed simultaneously into the solution, titania nanoparticles with relatively smaller size were assembled at the interstitial site of PS/HEMA nanoparticles packed in the FCC structure, resulting in a spherical opal composite structure. Spherical titania inverse opal structure was fabricated after removing PS/HEMA nanoparticles from the spherical opal composite structure by calcination.

Surface Modification of Titania Nanoparticles Using Ultrathin Ceramic Films

2006 ◽  
Vol 89 (10) ◽  
pp. 3070-3075 ◽  
Author(s):  
Luis F. Hakim ◽  
Jarod A. McCormick ◽  
Guo-Dong Zhan ◽  
Alan W. Weimer ◽  
Peng Li ◽  
...  
Keyword(s):  
Surface Modification ◽  
Titania Nanoparticles ◽  
Ceramic Films
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