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

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.

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

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.434-435.579 ◽

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.

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Self-Assembly and Characterization of TiO2/PS Complex Particle and TiO2 Hollow Spheres

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.197-198.136 ◽

2011 ◽

Vol 197-198 ◽

pp. 136-139

Author(s):

Fan Xiao ◽

Wei Li ◽

Zhi Xian Zhang ◽

Fei Gao

Keyword(s):

Self Assembly ◽

Ph Value ◽

Hollow Spheres ◽

Layer By Layer ◽

X Ray Diffraction ◽

Complex Particle ◽

Assembly Technique ◽

Synthesized Materials ◽

Hydrolysis Of

Using TiO2 particles obtained by hydrolysis of titanium oxysulfate as the precursor, polystyrene (PS) microspheres as the template, TiO2/PS complex particles were successfully deposited on Ti substrates through layer-by-layer self-assembly technique and the surfactant-assisted process at low temperature. Then removed PS spheres by two methods, TiO2 hollow spheres were attained. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were employed to characterize the synthesized materials. The results showed that the crystallization, structure and surface morphology of TiO2/PS on the surface have a great relationship with the pH value of treating solution. Diversity effects on surface integrity and bioactive of hollow spheres happened due to different ways of removing PS core.

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Photoresponsive Wettability in Monolayer Films from Sinapinic Acid

The Scientific World JOURNAL ◽

10.1155/2013/915237 ◽

2013 ◽

Vol 2013 ◽

pp. 1-6 ◽

Cited By ~ 2

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.

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Layer-by-Layer Fabrication and Tribological Investigation of PDDA/GO Multilayer Film

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.693.576 ◽

2016 ◽

Vol 693 ◽

pp. 576-585 ◽

Cited By ~ 1

Author(s):

Jian Shu ◽

Yu Song Liao

Keyword(s):

Photoelectron Spectroscopy ◽

Self Assembly ◽

Multilayer Film ◽

Layer By Layer ◽

Wear Properties ◽

Force Microscopy ◽

Assembly Technology ◽

Friction Performance ◽

Frictional Coefficients ◽

Better Than

Poly (diallyl dimethylammonium chloride)-graphene oxide multilayer film (PDDA/GO) was successfully fabricated onto a silicon substrate by a layer-by-layer self-assembly technology. Subsequently, PDDA/GO were thermally reduced to be PDDA/RGO in a vacuum. X-ray photoelectron spectroscopy (XPS) was carried out to investigate the formation and microstructure of multilayer samples, as well as by water contacted angle (WCA). Results indicates that the multilayer film was prepared successfully, and the surface energy of PDDA/RGO is lower than PDDA/GO. nanotribological properties was investigated by an atomic force microscopy (AFM). It was found that the frictional coefficients of PDDA/RGO is better than PDDA/GO. To investigate the micro-tribological behaviors, a ball-on-plate tribometer was adopted. Results show that the layer-by-layer self-assembled multilayer thin film possesses good frictional and anti-wear properties. Therefore, both nanoand micro friction performance of PDDA/RGO behaves better than PDDA/GO. The obtained samples make the further application to be more possible.

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

Nanomaterials ◽

10.3390/nano11081884 ◽

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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Self-assembly characterization of tilapia skin collagen in simulated body fluid with different salt concentrations

Process Biochemistry ◽

10.1016/j.procbio.2021.06.013 ◽

2021 ◽

Author(s):

Haohao Tian ◽

Zhongyang Ren ◽

Linfan Shi ◽

Gengxin Hao ◽

Jun Chen ◽

...

Keyword(s):

Simulated Body Fluid ◽

Self Assembly ◽

Body Fluid ◽

Skin Collagen

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Salivary polypeptide/hyaluronic acid multilayer coatings act as “fungal repellents” and prevent biofilm formation on biomaterials

Journal of Materials Chemistry B ◽

10.1039/c7tb02592k ◽

2018 ◽

Vol 6 (10) ◽

pp. 1452-1457 ◽

Cited By ~ 5

Author(s):

Jianchuan Wen ◽

Chih-Ko Yeh ◽

Yuyu Sun

Keyword(s):

Hyaluronic Acid ◽

Self Assembly ◽

Biofilm Formation ◽

Design Principle ◽

Multilayer Coatings ◽

Layer By Layer ◽

Denture Stomatitis ◽

Polyelectrolyte Layer ◽

Assembly Technology ◽

Systemic Health

Candida-associated denture stomatitis (CADS) is a common, recurring clinical complication in denture wearers that can lead to serious oral and systemic health problems. Polyelectrolyte layer-by-layer (LBL) self-assembly technology on denture materials offers a new design principle for controlling fungal biofilm formation.

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Preparation and Characterization of Nano-Films Materials

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.492.160 ◽

2011 ◽

Vol 492 ◽

pp. 160-163

Author(s):

Cai Xia Li ◽

Qing Lv ◽

Jie Song ◽

Dan Yu Jiang ◽

Qiang Li

Keyword(s):

Self Assembly ◽

Chemical Properties ◽

Layered Compounds ◽

Insertion Reaction ◽

Layer By Layer ◽

Vis Spectroscopy ◽

Assembly Technique ◽

Assembly Technology ◽

Physical And Chemical

Nano-sheets are two-dimensional sheet materials exfoliated from the inorganic layered compounds by various physical and chemical methods. Their unique characteristics insertion reaction and excellent physical and chemical properties have attracted more and more researchers' widespread interests. Selecting quartz glass as the substrate, using layer by layer self-assembly technology, different nano-films materials are prepared. UV/Vis spectroscopy confirmed nano-films materials have been successfully assembled using LBL self-assembly technique. Raman spectrum are mainly used to analyze and characterize the structure of nano-films materials.

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Facile Synthesis of TiO2 Hollow Spheres with Enhanced Photocatalytic Activity

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.641-642.266 ◽

2013 ◽

Vol 641-642 ◽

pp. 266-269

Author(s):

Yu Zhen Lv ◽

Wei Wang ◽

Sheng Nan Zhang ◽

You Zhou ◽

Cheng Rong Li

Keyword(s):

Uv Irradiation ◽

Rhodamine B ◽

Self Assembly ◽

Hollow Spheres ◽

Average Diameter ◽

Rutile Phase ◽

Photocatalytic Activities ◽

Bubble Template ◽

Tio2 Hollow Spheres ◽

Almost All

TiO2 hollow spheres were synthesized through a facile bubble-template hydrothermal method. Microscopic and diffraction data indicated that the well-crystallized rutile-phase product was composed of self-assembly nanorods with an average diameter of 35 nm. The as-grown product showed high photocatalytic activities in degradation of organic pollutants such as rhodamine B under UV irradiation. It was found that almost all rhodamine B can be decomposed after only 30 minutes of UV irradiation. The enhanced photocatalytic performances were probably attributed to the structure of TiO2 hierarchical hollow spheres, which supplied higher specific surface area and faster electron transport.

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