scholarly journals Polyelectrolyte Multilayers on Soft Colloidal Nanosurfaces: A New Life for the Layer-By-Layer Method

Polymers ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1221
Author(s):  
Ana Mateos-Maroto ◽  
Irene Abelenda-Núñez ◽  
Francisco Ortega ◽  
Ramón G. Rubio ◽  
Eduardo Guzmán
Keyword(s):  
Chemical Nature ◽  
Layer By Layer ◽  
Established Method ◽  
Opposite Charge ◽  
Emulsion Droplets ◽  
Current Trends ◽  
Layer Method ◽  
Different Types ◽  
Potential Impact ◽  
Controlled Structure

The Layer-by-Layer (LbL) method is a well-established method for the assembly of nanomaterials with controlled structure and functionality through the alternate deposition onto a template of two mutual interacting molecules, e.g., polyelectrolytes bearing opposite charge. The current development of this methodology has allowed the fabrication of a broad range of systems by assembling different types of molecules onto substrates with different chemical nature, size, or shape, resulting in numerous applications for LbL systems. In particular, the use of soft colloidal nanosurfaces, including nanogels, vesicles, liposomes, micelles, and emulsion droplets as a template for the assembly of LbL materials has undergone a significant growth in recent years due to their potential impact on the design of platforms for the encapsulation and controlled release of active molecules. This review proposes an analysis of some of the current trends on the fabrication of LbL materials using soft colloidal nanosurfaces, including liposomes, emulsion droplets, or even cells, as templates. Furthermore, some fundamental aspects related to deposition methodologies commonly used for fabricating LbL materials on colloidal templates together with the most fundamental physicochemical aspects involved in the assembly of LbL materials will also be discussed.

Construction of Antibacterial Surface Via Layer-by-Layer Method

2018 ◽  
Vol 24 (8) ◽  
pp. 926-935 ◽  
Author(s):  
Xianhua Zhang ◽  
Shaobo Ou-yang ◽  
Jiaolong Wang ◽  
Lan Liao ◽  
Runfa Wu ◽  
...  
Keyword(s):  
Antibacterial Agents ◽  
Deposition Process ◽  
Multilayer Thin Films ◽  
Layer By Layer ◽  
Lbl Assembly ◽  
Layer Method ◽  
Different Types ◽  
Antibacterial Surface ◽  
Materials Used ◽  
Antibacterial Surfaces

Construction of antibacterial surfaces or films is of great interest in various fields including biomedicine, food, agriculture and so on. So far, a number of antibacterial agents have been used to construct antibacterial surfaces. Layer-by-Layer (LbL) assembly is a simple and versatile deposition process for fabricating multilayer thin films with great advantages to control the architecture and composition of the films. In this review, we give a brief introduction of LbL, and different materials used to fabricate antibacterial surfaces with LbL assembly approach are described as well as their drawbacks. Much attention is also paid to the recent development of multifunctional and intelligent antibacterial surfaces. Moreover, the advantages and limitations of these different types of antibacterial materials are summarized and subsequently directions for future development are proposed.

scholarly journals Fabrication of cyanine dye thin films grown by a layer-by-layer method

2015 ◽  
Vol 2 (7) ◽  
pp. 076402 ◽  
Author(s):  
Junpei Nagauchi ◽  
Osamu Kojima ◽  
Takashi Kita ◽  
YongGu Shim
Keyword(s):  
Thin Films ◽  
Cyanine Dye ◽  
Layer By Layer ◽  
Layer Method

Synthesis of fly-ash cenospheres coated with polypyrrole using a layer-by-layer method

2011 ◽  
Vol 44 (44) ◽  
pp. 445301 ◽  
Author(s):  
Qin Li ◽  
Bing Wang ◽  
Chuang Li ◽  
Jianfeng Pang ◽  
Jianping Zhai
Keyword(s):  
Fly Ash ◽  
Layer By Layer ◽  
Layer Method ◽  
Fly Ash Cenospheres

Characterisation of Drawing Papers for Borko Lazeski’s Cartoons (1951–56)

2018 ◽  
Vol 39 (3) ◽  
pp. 157-183
Author(s):  
Maja Kostadinovska
Keyword(s):  
Raman Spectroscopy ◽  
Chemical Nature ◽  
Lignin Content ◽  
Mural Painting ◽  
Micro Raman Spectroscopy ◽  
Different Types ◽  
Informed Treatment ◽  
Acidic Conditions ◽  
Spot Tests ◽  
High Lignin Content

Abstract This paper presents a study of the drawing papers from Borko Lazeski’s cartoons for a mural painting. The collection is comprised of more than 20 single pieces (170×500 cm) executed in charcoal, pencil, pastel, tempera and ink. The cartoons exhibit different types of damages, such as grease stains, moisture stains, cracks, flaking paint, areas of loss caused by insects and mould stains. The study included spot tests, ATR-FTIR and micro-Raman spectroscopy to characterise the artist’s papers. They were found to be a type of paper composed of partly bleached, neutral sulphite semi-chemical (NSSC) wood pulp originating from coniferous trees (softwood) with the occasional use of abaca fibres. The laboratory tests revealed slightly acidic conditions (pH=5.01–6.52), high lignin content (>5 %) and alum-rosin sizing. Infrared spectroscopy confirmed all findings of the spot tests. Micro-Raman spectroscopy showed the presence of gypsum in the papers. The study addresses conservation issues arising from the chemical nature of the paper support and highlights the need for an extended study in order to be able to make informed treatment choices.

scholarly journals Effect of Sepiolite-Loaded Fe2O3 on Flame Retardancy of Waterborne Polyurethane

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Tong Xu ◽  
Di Qian ◽  
Yelei Hu ◽  
Yuanzhao Zhu ◽  
Yi Zhong ◽  
...  
Keyword(s):  
Flame Retardant ◽  
Waterborne Polyurethane ◽  
Layer By Layer ◽  
Solution Deposition ◽  
Good Thermal Stability ◽  
Layer Method ◽  
Combustion Tests ◽  
Microscopic Morphology ◽  
Coated Cotton ◽  
Thermal Stability Of

In this study, a kind of inorganic composite flame retardant (Sep@Fe2O3) was prepared by combining solution deposition and calcination methods using sepiolite microfiber material as carrier. This inorganic compound flame retardant was combined with waterborne polyurethane (WPU) through layer-by-layer method to prepare WPU composites. The SEM and EDS, TEM, and XRD were used to characterize the microscopic morphology and crystal structure of WPU composites. Thermogravimetric analysis tests confirmed the good thermal stability of WPU/Sep@Fe2O3 composites; at the temperature of 600°C, the carbon residual percentage of WPU/Sep, WPU/Fe2O3, and WPU/Sep@Fe2O3 composites is 7.3%, 12.2%, and 13.4%, respectively, higher than that of WPU (1.4%). Vertical combustion tests proved better flame-retardant property of WPU/Sep@Fe2O3 composite-coated cotton than noncoated cotton. The microcalorimeter test proved that the PHRR of WPU/Sep@Fe2O3 composites decreased by 61% compared with that of WPU. In addition, after combining with Sep@Fe2O3, the breaking strength of WPU increased by 35%.

Multisensor systems based on phthalocyanines for monitoring the quality of grapes

2016 ◽  
Vol 20 (08n11) ◽  
pp. 889-894 ◽  
Author(s):  
Maria Luz Rodriguez-Mendez ◽  
Celia García-Hernandez ◽  
Cristina Medina-Plaza ◽  
Cristina García-Cabezón ◽  
Jose Antonio de Saja
Keyword(s):  
State Of The Art ◽  
Layer By Layer ◽  
Carbon Paste ◽  
Electron Mediator ◽  
Multisensor Systems ◽  
Langmuir Blodgett ◽  
Different Types ◽  
Production Stages ◽  
Nanostructured Sensors

Arrays of phthalocyanine-based sensors with complementary activity have been used to develop voltammetric electronic tongues. Such systems have demonstrated to be useful in enology for the evaluation of quality of wines in different production stages, from grapes to bottles. In this paper, the state of the art of multisensor systems based on phthalocyanines dedicated to the analysis of musts (juices obtained from crushed grapes) is described. Such multisensor systems cover different types of sensors from simple Carbon Paste Electrodes, to sophiticated nanostructured sensors, including Langmuir–Blodgett or Layer by Layer thin films and biomimetic biosensors where phthalocyanines play a crucial role as electron mediator between enzymes and electrodes. In all cases, multisensor systems based on phthalocyanines have been able to discriminate musts prepared from different varieties of grapes. The performance of these systems can be improved by combining non-specific sensors with biosensors containing enzymes selective to phenols. In this case, excellent relationships have been found between the responses provided by the array and the content in phenols and acids provided by traditional chemical analysis.

scholarly journals Impact of Different Types of Diet on Gut Microbiota Profiles and Cancer Prevention and Treatment

Medicina ◽  
2019 ◽  
Vol 55 (4) ◽  
pp. 84 ◽  
Author(s):  
Rainer Klement ◽  
Valerio Pazienza
Keyword(s):  
Weight Loss ◽  
Gut Microbiota ◽  
Cancer Prevention ◽  
Food Culture ◽  
Microbiota Composition ◽  
Sedentary Behaviors ◽  
Prevention And Treatment ◽  
Different Types ◽  
Potential Impact ◽  
Food Consumed

Diet is frequently considered as a food regimen focused on weight loss, while it is actually the sum of food consumed by the organism. Western diets, modern lifestyle, sedentary behaviors, smoking habits, and drug consumption have led to a significant reduction of gut microbial diversity, which is linked to many non-communicable diseases (NCDs). The latter kill 40 million people each year, equivalent to more than 70% of all deaths globally. Among NCDs, tumors play a major role, being responsible for 29% of deaths from NCDs. A link between diet, microbiota, and cancer prevention and treatment has recently been unveiled, underlining the importance of a new food culture based on limiting dietary surplus and on preferring healthier foods. Here, we review the effects of some of the most popular “cancer-specific” diets on microbiota composition and their potential impact on cancer prevention and treatment.

Fabrication of Metalloporphyrin-Polyoxometalyte Hybrid Film by Layer-by-Layer Method and Its Catalysis for Dioxygen Reduction

2002 ◽  
Vol 14 (22) ◽  
pp. 1557-1563 ◽  
Author(s):  
Yan Shen ◽  
Jianyun Liu ◽  
Junguang Jiang ◽  
Baifeng Liu ◽  
Shaojun Dong
Keyword(s):  
Hybrid Film ◽  
Layer By Layer ◽  
Dioxygen Reduction ◽  
Layer Method

High-Energy Density Li–O2 Battery with a Polymer Electrolyte-Coated CNT Electrode via the Layer-by-Layer Method

2020 ◽  
Vol 12 (15) ◽  
pp. 17385-17395 ◽  
Author(s):  
Hyunpyo Lee ◽  
Dong Joon Lee ◽  
Mokwon Kim ◽  
Hyunjin Kim ◽  
Young Shik Cho ◽  
...  
Keyword(s):  
Energy Density ◽  
Polymer Electrolyte ◽  
High Energy ◽  
High Energy Density ◽  
Layer By Layer ◽  
Layer Method
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