Multilayer Hybrid Films of Titania Semiconductor Nanosheet and Silver Metal Fabricated via Layer-by-Layer Self-Assembly and Subsequent UV Irradiation

2006 ◽  
Vol 18 (5) ◽  
pp. 1235-1239 ◽  
Author(s):  
Yong Zhou ◽  
Renzhi Ma ◽  
Yasuo Ebina ◽  
Kazunori Takada ◽  
Takayoshi Sasaki
Keyword(s):  
Uv Irradiation ◽  
Self Assembly ◽  
Layer By Layer ◽  
Hybrid Films ◽  
Silver Metal

UV-Enhanced Bioactivity of PS/TiO2 Coating Prepared by Layer-by-Layer Self-Assembly Method

2010 ◽  
Vol 434-435 ◽  
pp. 579-581
Author(s):  
Zhi Xian Zhang ◽  
Fan Xiao ◽  
Fei Gao
Keyword(s):  
Uv Irradiation ◽  
Ultraviolet Irradiation ◽  
Self Assembly ◽  
Raw Material ◽  
Layer By Layer ◽  
Titanium Coating ◽  
Water Contact ◽  
Oh Groups ◽  
Assembly Method ◽  
Assembly Technology

The TiO2 nanopowder was prepared with TiOSO4 as raw material at low temperature by hydrolysis method, and microspheres coated polyethylene and TiO2 were then fabricated on titanium by layer-by-layer self-assembly technology. Using ultraviolet irradiation of titanium coating in distilled water for some time, titanium with enhanced bioactivity was achieved when immersed in simulated body fluid (SBF). The morphology, size and crystal shape before and after ultraviolet irradiation were characterized by scanning electron microcopy (SEM) and X-ray diffraction (XRD). UV irradiation of titanium results in the conversion of Ti4+ to Ti3+ and the generation of oxygen vacancies, which could react with the absorbed water to form basic Ti–OH groups. Compared with the coating non-UV irradiation, the UV-irradiated coatings do not present any obvious differences in morphology, surface roughness, grain size and phase component; however, they have more abundant basic Ti–OH groups thus the water contact angle decreases greatly so the surface become much more hydrophilic.

Bioactivity of L-b-L Self-Assembly TiO2 Hollow Spheres by UV Irradiation Enhanced

2011 ◽  
Vol 328-330 ◽  
pp. 1495-1498
Author(s):  
Fan Xiao ◽  
Wei Li ◽  
Fei Gao ◽  
Zhi Xian Zhang
Keyword(s):  
Simulated Body Fluid ◽  
Uv Irradiation ◽  
Self Assembly ◽  
Body Fluid ◽  
Irradiation Time ◽  
Hollow Spheres ◽  
Layer By Layer ◽  
Assembly Technology ◽  
Hydrolysis Of ◽  
Better Than

Using nano-TiO2 particles obtained by hydrolysis of titanium oxysulfate (TiOSO4) as the precursor, and polystyrene (PS) spheres as the template, TiO2 hollow spheres were successfully deposited on CPTi substrates through layer-by-layer self-assembly technology. After ultraviolet light (UV) irradiation, the TiO2 coatings were soaked in simulated body fluid (SBF) to explore their bioactivities. The effects of UV irradiation time and UV irradiation media on the bioactivities of nano TiO2 coatings were investigated. The results show that bone-like apatite can be formed on the surface of nano TiO2 coating irradiated by UV, and this reveals that the irradiated coating has good bioactivity. The amount of apatite formed on the surface of the coating increases with the increase of UV irradiation time. UV-irradiated media also influence the bioactivity of the coating. The bioactivities of nano TiO2 coatings irradiated in air and SBF are better than that in water.

Nanostructured and Electroactive Hybrid Films Containing Microcrystalline Cellulose Modified with the Phosphate Group: Synthesis and Characterization

2016 ◽  
Vol 869 ◽  
pp. 840-845
Author(s):  
Paulo Ronaldo Sousa Teixeira ◽  
Ana Siqueira do Nascimento Marreiro ◽  
José Regilmar Teixeira da Silva ◽  
Emanuel Airton de Oliveira Farias ◽  
Natália de Araujo Dionisio ◽  
...  
Keyword(s):  
Microcrystalline Cellulose ◽  
Self Assembly ◽  
Phosphate Group ◽  
Synthesis And Characterization ◽  
Layer By Layer ◽  
Preparation Process ◽  
Hybrid Films ◽  
Assembly Technique ◽  
Phosphate Groups ◽  
Modified Cellulose

Nanostructured and electroactive hybrid films containing Microcrystalline Cellulose (MC) modified with the phosphate group (MCPO4) and polyaniline (PANI) were prepared using the Layer-by-Layer (LbL) self-assembly technique. In the preparation process of the films cellulose was dispersed in the solution of PANI and the film with PVS/PANI(MCPO4) structure was immobilized on ITO substrate. In order to investigate the influence of the phosphate group on the electrochemical behavior of the film, films were also prepared replacing the modified cellulose (MCPO4) by unmodified cellulose (MC), forming the PVS/PANI(MC) films. Subsequently, all films were characterized by cyclic voltammetry (CV), and the results showed the redox processes characteristic of PANI, but the presence of CMPO4 promotes an increase in the values of current density observed for the PVS/PANI(MCPO4) film when compared to the PVS/PANI(MC) film. This is probably due to a self-doping process of the polymer in the presence of phosphate groups.

Superhydrophobic hybrid films prepared from silica nanoparticles and ionic liquids via layer-by-layer self-assembly

2014 ◽  
Vol 570 ◽  
pp. 27-32 ◽  
Author(s):  
Chenyun Zhang ◽  
Shengnan Zhang ◽  
Picheng Gao ◽  
Hongmin Ma ◽  
Qin Wei
Keyword(s):  
Ionic Liquids ◽  
Silica Nanoparticles ◽  
Self Assembly ◽  
Layer By Layer ◽  
Hybrid Films

scholarly journals Photoresponsive Wettability in Monolayer Films from Sinapinic Acid

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Cleverson A. S. Moura ◽  
Douglas J. C. Gomes ◽  
Nara C. de Souza ◽  
Josmary R. Silva
Keyword(s):  
Uv Irradiation ◽  
Self Assembly ◽  
Irradiation Time ◽  
Morphological Structure ◽  
Sinapinic Acid ◽  
Layer By Layer ◽  
Monolayer Films ◽  
Wetting Contact Angle ◽  
Assembly Technique ◽  
Contact Angle Analysis

Sinapinic acid is an interesting material because it is both antioxidant and antibacterial agent. In addition, when illuminated with ultraviolet light, it can exhibit the so-called photodimerization process. In this paper, we report on the investigation of monolayer films from 3,5-dimethoxy-4-hydroxycinnamic acid (sinapinic acid, SinA) deposited onto poly(allylamine hydrochloride), PAH, films. SinA monolayers were prepared by using the layer-by-layer (LbL) self-assembly technique. Adsorption kinetics curves were well fitted by a biexponential function suggesting that the adsorption process is determined by two mechanisms: nucleation and growth of aggregates. By using wetting contact angle analysis, we have found that SinA monolayers exhibit photoresponsive wettability under UV irradiation (365 nm); that is, wettability decreases with increasing UV irradiation time. The photoresponse of wettability was attributed to photodimerization process. This hypothesis was supported by the dependence of surface morphological structure and absorption on UV irradiation time. The mechanism found in the well-known transcinnamic acid crystals is used to explain the photodimerization process in SinA monolayers.

scholarly journals Construction of Chitosan/Alginate Nano-Drug Delivery System for Improving Dextran Sodium Sulfate-Induced Colitis in Mice

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1884
Author(s):  
Mengfei Jin ◽  
Shangyong Li ◽  
Yanhong Wu ◽  
Dandan Li ◽  
Yantao Han
Keyword(s):  
Self Assembly ◽  
Average Diameter ◽  
Mucosal Healing ◽  
Plga Nanoparticles ◽  
Narrow Particle Size Distribution ◽  
Layer By Layer ◽  
Systemic Side Effects ◽  
Assembly Technology ◽  
The Fourier Transform ◽  
Polyelectrolyte Film

(1) Background: In the treatment of ulcerative colitis (UC), accurate delivery and release of anti-inflammatory drugs to the site of inflammation can reduce systemic side effects. (2) Methods: We took advantage of this goal to prepare resveratrol-loaded PLGA nanoparticles (RES-PCAC-NPs) by emulsification solvent volatilization. After layer-by-layer self-assembly technology, we deposited chitosan and alginate to form a three-layer polyelectrolyte film. (3) Results: It can transport nanoparticles through the gastric environment to target inflammation sites and slowly release drugs at a specific pH. The resulting RES-PCAC-NPs have an ideal average diameter (~255 nm), a narrow particle size distribution and a positively charged surface charge (~13.5 mV). The Fourier transform infrared spectroscopy showed that resveratrol was successfully encapsulated into PCAC nanoparticles, and the encapsulation efficiency reached 87.26%. In addition, fluorescence imaging showed that RES-PCAC-NPs with positive charges on the surface can effectively target and accumulate in the inflammation site while continuing to penetrate downward to promote mucosal healing. Importantly, oral RES-PCAC-NPs treatment in DSS-induced mice was superior to other results in significantly improved inflammatory markers of UC. (4) Conclusions: Our results strongly prove that RES-PCAC-NPs can target the inflamed colon for maximum efficacy, and this oral pharmaceutical formulation can represent a promising formulation in the treatment of UC.

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