Fabrication of Oxide Compound Nano-Films Materials by LBL Self-Assembly Technology

2012 ◽  
Vol 512-515 ◽  
pp. 1696-1699
Author(s):  
Cai Xia Li ◽  
Peng Fei Zhu ◽  
Dan Yu Jiang ◽  
Qing Lv ◽  
Qiang Li
Keyword(s):  
Cobalt Oxide ◽  
Self Assembly ◽  
Tantalum Oxide ◽  
Chemical Properties ◽  
Electrostatic Attraction ◽  
External Object ◽  
Layer By Layer ◽  
Oxide Compound ◽  
Assembly Technology ◽  
Object Level

LBL (layer by layer) fabrication was based on the electrostatic attraction between the nanosheets host partial with electric charges and external object with opposite charges. By changing the property of the object, level defects can also be introduced, so that the nano-films with remarkable physica-chemical properties can be prepared. Tantalum oxide and cobalt oxide nano-films materials were made via LBL self-assembly technology in this work

Preparation and Characterization of Nano-Films Materials

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.

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.

scholarly journals Direct Patterning and Spontaneous Self-Assembly of Graphene Oxide via Electrohydrodynamic Jet Printing for Energy Storage and Sensing

Micromachines ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 13 ◽  
Author(s):  
Bin Zhang ◽  
Jaehyun Lee ◽  
Mincheol Kim ◽  
Naeeung Lee ◽  
Hyungdong Lee ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Energy Storage ◽  
Self Assembly ◽  
High Performance ◽  
Three Dimensional ◽  
Chemical Properties ◽  
Layer By Layer ◽  
Energy Storage Devices ◽  
Laminar Structure ◽  
Jet Printing

The macroscopic assembly of two-dimensional materials into a laminar structure has received considerable attention because it improves both the mechanical and chemical properties of the original materials. However, conventional manufacturing methods have certain limitations in that they require a high temperature process, use toxic solvents, and are considerably time consuming. Here, we present a new system for the self-assembly of layer-by-layer (LBL) graphene oxide (GO) via an electrohydrodynamic (EHD) jet printing technique. During printing, the orientation of GO flakes can be controlled by the velocity distribution of liquid jet and electric field-induced alignment spontaneously. Closely-packed GO patterns with an ordered laminar structure can be rapidly realized using an interfacial assembly process on the substrates. The surface roughness and electrical conductivity of the LBL structure were significantly improved compared with conventional dispensing methods. We further applied this technique to fabricate a reduced graphene oxide (r-GO)-based supercapacitor and a three-dimensional (3D) metallic grid hybrid ammonia sensor. We present the EHD-assisted assembly of laminar r-GO structures as a new platform for preparing high-performance energy storage devices and sensors.

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

2018 ◽  
Vol 6 (10) ◽  
pp. 1452-1457 ◽  
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.

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.

scholarly journals Layer-by-Layer Encapsulation of Herbicide-Degrading Bacteria for Improved Surface Properties and Compatibility in Soils

Polymers ◽  
2021 ◽  
Vol 13 (21) ◽  
pp. 3814
Author(s):  
Reut Gal ◽  
Neriya Perez-Lapid ◽  
Yael Zvulunov ◽  
Adi Radian
Keyword(s):  
Surface Properties ◽  
Self Assembly ◽  
Chemical Properties ◽  
Polymeric Coating ◽  
Layer By Layer ◽  
Microscopy Imaging ◽  
E Coli ◽  
Degrading Bacteria ◽  
Herbicide Atrazine

E. coli cells overexpressing the enzyme atrazine chlorohydrolase were coated using layer-by-layer self-assembly. The polymeric coating was designed to improve the surface properties of the cells and create positively charged, ecologically safe, bio-hybrid capsules that can efficiently degrade the herbicide atrazine in soils. The physio-chemical properties of the bacteria/polymer interface were studied as a function of the polymeric composition of the shell and its thickness. Characterization of cell viability, enzyme activity, morphology, and size of the bio-capsules was done using fluorescence spectroscopy, BET and zeta potential measurements and electron microscopy imaging. Out of several polyelectrolytes, the combination of polydiallyldimethylammonium chloride and polysodium 4-styrenesulfonate improved the surface properties and activity of the cells to the greatest extent. The resulting bio-hybrid capsules were stable, well-dispersed, with a net positive charge and a large surface area compared to the uncoated bacteria. These non-viable, bio-hybrid capsules also exhibited a kinetic advantage in comparison with uncoated cells. When added to soils, they exhibited continuous activity over a six-week period and atrazine concentrations declined by 84%. Thus, the concept of layer-by-layer coated bacteria is a promising avenue for the design of new and sustainable bioremediation and biocatalytic platforms.

Preparation of the Layer-by-Layer Deposited Silver Nanoparticles Multilayer Films on Poly(ethylene Terephalate) Substrate

2011 ◽  
Vol 189-193 ◽  
pp. 1362-1365
Author(s):  
De Shan Cheng ◽  
Xiao Yan Liu ◽  
Ji Hong Wu ◽  
Wei Dong Yu
Keyword(s):  
Silver Nanoparticles ◽  
Self Assembly ◽  
Inductively Coupled Plasma ◽  
Multilayer Films ◽  
Layer By Layer ◽  
Inductively Coupled ◽  
Assembly Technology ◽  
Poly Ethylene ◽  
Pet Film ◽  
Pet Substrate

This research presented the preparation of multilayer films on poly(ethylene terephalate) (PET) Substrate by electrostatic self-assembly technology. The silver nanoparticles were characterized by UV–vis spectrometry and scanning electron microscopy (SEM). The sequential dipping of hydrolyzed PET substrate in dilute solutions of poly(diallyldimethyl ammonium chloride)(PDDA) and silver nanoparticles to fabricate multilayer films. The multilayer films were monitored by UV–vis spectrometry, the surface plasmon resonance (SPR) obtained at 420 nm confirmed the existence of nanosilver on the PET film. The silver nanoparticles were also verified by the Inductively Coupled Plasma Spectrometry (ICP) and thermogravimetric analysis of the multilayer film. The transmission spectra indicated that the PET films contained silver nanoparticles have better UV protection property.

Determination of Ascorbic Acid Based on Gold Nanoparticles-L-Alanine/GCE

2011 ◽  
Vol 214 ◽  
pp. 498-502 ◽  
Author(s):  
Hai Yan Kuang ◽  
Jia Hong He ◽  
Qiang Xu ◽  
Zhong Rong Song
Keyword(s):  
Gold Nanoparticles ◽  
Ascorbic Acid ◽  
Self Assembly ◽  
High Sensitivity ◽  
Glass Electrode ◽  
Layer By Layer ◽  
Current Time ◽  
Electrochemical Behaviors ◽  
Assembly Technology

A Gold nanoparticles-L-alanine modified glass electrode has been successfully fabricated by using layer-by-layer self-assembly technology and used for determination of ascorbic acid. First, the clean electrode was immersed into L-Alanine solution to acquire a L-Alanine film on the surface of GCE and dried at room temperature, then the gold colloid was dipped onto the L-Alanine film. The electrochemical behaviors of ascorbic acid at the modified electrode were investigated by cyclic voltammetry and current-time techniques. The results showed that the sensor produced high sensitivity and good stability to ascorbic acid and the current was linear with the concentration of ascorbic acid in the range of 1.20×10-5 to 1.60×10-4 mol/L with a detection limit of 1.00×10-5 mol/L.

Combinatorial Research of Molecular Technologies and Surface Nanostructures Applied to the Development of Antifouling Coatings

2019 ◽  
Vol 19 (6) ◽  
pp. 3647-3653 ◽  
Author(s):  
Bing Yin ◽  
Chaohong Liu
Keyword(s):  
Self Assembly ◽  
Surface Hydrophobicity ◽  
Layer By Layer ◽  
Bacterial Cells ◽  
Multilayered Films ◽  
Antimicrobial Coatings ◽  
Surface Nanostructures ◽  
Assembly Technology ◽  
The Right ◽  
Organic Particles

Contact antimicrobial coatings have been a subject of increasing interest partly because of the contribution of biocide release coatings to antibiotic resistance. The surface hydrophobicity of these coatings can enhance their effectiveness and stability. In this work, polyethyleneimine (PEI) was quaternized with 1-bromoalkane and iodomethane, and a concept for antimicrobial coatings was developed on the basis of the polyelectrolyte multilayered films. The multilayered films were endowed with antibacterial property by grafting modified polycation (higher charge density) and with fouling-release property by constructing microstructures and nanostructures with low surface energy (long alkyl chains). The resultant polycation-coated substrates were able to kill the encountered bacterial cells on contact, and to release the dead bacteria and organic particles. The conclusion demonstrated that the microbicidal functionality could be imparted onto surfaces using layer-by-layer (LbL) self-assembly technology by using the right combination of molecular technologies and surface nanostructures, as well as the assembly and/or post-assembly experimental technical factors.

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