PHYSICO-CHEMICAL PROPERTIES OF A NANOCOMPOSITE HYDROGEL COATING ON A TEXTILE CARRIER FOR THE WOUND TREATMENT

Нанотехнологии с использованием биополимеров находят широкое применение в биомедицинских приложениях. В данной работе разработаны нанокомпозитные гидрогели на основе природных (хитозан, карбоксиметилцеллюлоза) и синтетических (поливиниловый спирт) полимеров с наночастицами серебра для нанесения на текстильный носитель. В качестве сшивающих реагентов при создании гидрогелей использовали диальдегид карбоксиметилцеллюлозы и борную кислоту. Были определены физико-химические свойства (сорбционная способность при одностороннем контакте с модельной средой, степень набухания, паропроницаемость, капиллярность) гидрогелевых покрытий на текстильном носителе, и кинетика выхода лекарственных веществ (лидокаин, диоксидин), включенных в состав гидрогелей. Показано, что материалы с двухслойным покрытием характеризуются более высокими сорбционными свойствами по отношению к физиологическому раствору и более длительным выходом лекарственных средств, чем материалы с однослойным покрытием. Выход лекарственных веществ из двухслойных покрытий происходит в два этапа с максимальным высвобождением в течение двух суток. Полученные текстильные материалы с пленочным нанокомпозитным гидрогелевым покрытием могут найти применение в качестве перевязочных средств при лечении ран. Nanotechnologies using biopolymers are widely used in biomedical applications. In this work, nanocomposite hydrogels based on natural (chitosan, carboxymethylcellulose) and synthetic (polyvinyl alcohol) polymers with silver nanoparticles for application to a textile carrier have been developed. Carboxymethylcellulose dialdehyde and boric acid were used as crosslinking reagents in the creation of hydrogels. Physicochemical properties (sorption capacity in unilateral contact with the model medium, degree of swelling, vapor permeability, capillarity) of hydrogel coatings on a textile carrier, and the kinetics of the drugs release (lidocaine, dioxidine) included in the hydrogels were determined. It is shown that materials with a two-layer coating are characterized by higher sorption properties relative to saline and a longer release of drugs than materials with a single-layer coating. The release of drugs from the two-layer coatings occurs in two stages with a maximum release within two days. The obtained textile materials with a film nanocomposite hydrogel coating can be used as dressings in the treatment of wounds.

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A study on the electromagnetic properties of graphite/bismuth/bismuth oxide-coated composites

Textile Research Journal ◽

10.1177/0040517521994342 ◽

2021 ◽

pp. 004051752199434

Author(s):

Yuanjun Liu ◽

Yanfeng Yang

Keyword(s):

Mechanical Property ◽

Dielectric Constant ◽

Bismuth Oxide ◽

Control Variable ◽

Single Layer ◽

Polarization Property ◽

Electromagnetic Properties ◽

Shielding Effectiveness ◽

Absorbing Property ◽

Layer Coating

Coating is a commonly used process for the preparation of protective textiles. In this study, the absorbing coated composite material was prepared by a coating process, using plain weave polyester/cotton fabric as the base fabric, PU-2540 polyurethane as the binder, and graphite, bismuth and bismuth oxide as the functional particles. The effects of the content of functional particles and the ratio of functional particles on the dielectric constant, reflection loss, shielding effectiveness, and tensile strength of the single-layer coating composites were studied using the control variable method. The results showed that when the frequency was 1–1000 MHz, the real and imaginary parts of the dielectric constant, the tangential value of the loss angle, and the tensile value increased with the increase of the coating content, and the polarization, loss and attenuation property, and mechanical property of the electromagnetic wave were enhanced. When graphite, bismuth, and bismuth oxide was mixed at the ratio of 9:0:0 in weight, the polarization property was the best. When mixed at the ratio of 6:1:2 in weight, the loss performance and attenuation ability were the best. When mixed at the ratio of 6:3:0 in weight, the absorbing property and mechanical property were the best. When mixed at the ratio of 6:2:1 in weight, the shielding property was the best.

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Soil physico-chemical characterization in the different soil layers of National Maize Research Program, Rampur, Chitwan, Nepal

Journal of Maize Research and Development ◽

10.3126/jmrd.v3i1.18918 ◽

2018 ◽

Vol 3 (1) ◽

pp. 28-44

Author(s):

Dinesh Khadka ◽

Sushil Lamichhane ◽

Amit P Timilsina ◽

Bandhu R Baral ◽

Kamal Sah ◽

...

Keyword(s):

Research Program ◽

Soil Structure ◽

Sandy Loam ◽

Chemical Properties ◽

Single Layer ◽

Chemical Characterization ◽

Bottom Layer ◽

Soil Parameters ◽

Physico Chemical

Soil pit digging and their precise study is a decision making tool to assess history and future of soil management of a particular area. Thus, the present study was carried out to differentiate soil physico-chemical properties in the different layers of excavated pit of the National Maize Research Program, Rampur, Chitwan, Nepal. Eight pits were dug randomly from three blocks at a depth of 0 to 100 cm. The soil parameters were determined in-situ, and in laboratory for texture, pH, OM, N, P (as P2O5), K (as K2O), Ca, Mg, S, B, Fe, Zn, Cu and Mn of collected soils samples of different layers following standard analytical methods at Soil Science Division, Khumaltar. The result revealed that soil structure was sub-angular in majority of the layers, whereas bottom layer was single grained. The value and chrome of colour was increasing in order from surface to bottom in the majority pits. Similarly, the texture was sandy loam in majority layers of the pits. Moreover, four types of consistence (loose to firm) were observed. Furthermore, mottles and gravels were absent in the majority layers. Likewise, soil was very to moderately acidic in observed layers of majority pits, except bottom layer of agronomy block was slightly acidic. Regarding fertility parameters (OM, macro and micronutrients), some were increasing and vice-versa, while others were intermittent also. Therefore, a single layer is not dominant for particular soil physico-chemical parameters in the farm. In overall, surface layer is more fertile than rest of the layers in all the pits.

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Preparation, properties and applications of wheat gluten edible films

Agricultural and Food Science ◽

10.23986/afsci.5650 ◽

2000 ◽

Vol 9 (1) ◽

pp. 23-35 ◽

Cited By ~ 24

Author(s):

P. TANADA-PALMU ◽

H. HELÉN ◽

L. HYVÖNEN

Keyword(s):

Weight Loss ◽

Tensile Strength ◽

Water Vapor ◽

Wheat Gluten ◽

Single Layer ◽

Water Vapor Permeability ◽

Edible Films ◽

Bilayer Film ◽

Vapor Permeability ◽

Elongation At Break

Edible films from wheat gluten were prepared with various amounts of glycerol as a plasticizer. Water vapor permeability, oxygen permeability, tensile strength and percentage elongation at break at different water activities ( aw ) were measured. Films with low amounts of glycerol had lower water vapor and oxygen permeabilities, higher tensile strength and lower elongation at break. Wheat gluten coatings reduced weight loss during two weeks of storage for cherry tomatoes and sharon fruits compared to uncoated controls. A bilayer film of wheat gluten and beeswax significantly lowered weight loss from coated cheese cubes compared to single layer coating of wheat gluten.;

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Structure and Physico-Chemical Properties of Single Layer and Few-Layer TMDCs

Two-Dimensional Transition-Metal Dichalcogenides - Springer Series in Materials Science ◽

10.1007/978-3-319-31450-1_5 ◽

2016 ◽

pp. 109-163

Author(s):

Alexander V. Kolobov ◽

Junji Tominaga

Keyword(s):

Chemical Properties ◽

Single Layer ◽

Physico Chemical

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Strategy to construct polyzwitterionic hydrogel coating with antifouling, drag-reducing and weak swelling performance

RSC Advances ◽

10.1039/c8ra09358j ◽

2019 ◽

Vol 9 (4) ◽

pp. 2081-2091 ◽

Cited By ~ 9

Author(s):

Jiajia Shen ◽

Miao Du ◽

Ziliang Wu ◽

Yihu Song ◽

Qiang Zheng

Keyword(s):

Mechanical Properties ◽

Swelling Behavior ◽

Hydrogel Coatings ◽

Hydrogel Coating

Polyzwitterionic hydrogel coatings with weak swelling behavior and strong mechanical properties were prepared and exhibited excellent antifouling and drag-reducing performances.

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The Application of Laser-Generated Ultrasound Technology in Coating-Substrate Systems

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.868.139 ◽

2017 ◽

Vol 868 ◽

pp. 139-150

Author(s):

Zhi Xiang Xu ◽

Hai Yang Guo

Keyword(s):

Bp Neural Network ◽

Precise Measurement ◽

Single Layer ◽

Young Modulus ◽

Ultrasound Wave ◽

Uncoated Sample ◽

Wave Forms ◽

Ultrasound Technology ◽

Neural Network Algorithm ◽

Layer Coating

Based on thermo-elastic regime, ultrasound can be generated by modulated laser pulse. When laser-generated ultrasound technology is applied to measure the thickness of coating and study the coating characters, even analysis the effects of coating during detecting the cracks and voids of the substrate, it is shown that it’s a very efficiency technology. When measuring the coating thickness, it can control the accuracy scope at the nanoscale; the relative error is under 2% for single layer coating, under 10% for double layer coating. As to coating characters, for example, Young modulus, Poisson's ratio etc, according to BP Neural network algorithm, use the nonlinear map relationship between material parameter and laser generated ultrasound wave forms to get these coating characters reversal. Studying the dispersion characteristic of the coating-substrate system can analysis effects of coating to defects detecting that coating absorbs large energy which leads to faster heat conduction speed than uncoated sample, but have smaller surface wave amplitude. All these are shown that laser-generated ultrasound technology can realize high-precise measurement and have an extensive use in the field of nondestructive testing.

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Optimization of the Coating Technology for Super-Porous Propellant

Materials Science Forum ◽

10.4028/www.scientific.net/msf.984.177 ◽

2020 ◽

Vol 984 ◽

pp. 177-182

Author(s):

Meng Lei Zhou ◽

Li Na Zhang ◽

Yang Liu ◽

Feng Qiang Nan

Keyword(s):

Impact Test ◽

Three Dimensional ◽

Single Layer ◽

Video Observation ◽

Coating Technology ◽

Cladding Layer ◽

Different Temperatures ◽

Mechanical Performances ◽

Cladding Layers ◽

Layer Coating

In order to obtain better quality and mechanical performances, the coating process of super-porous propellants was optimized. The mechanical performances of super-porous propellants were tested, under some conditions with different temperatures, different numbers of cladding layers, different thicknesses of the cladding layer and different ratios of inner and outer layers, through many different analytical methods including impact test, interrupted-burning test and three-dimensional video observation test. The results show that the mechanical performances of super-porous propellants are positively correlated with the temperature, the coating thickness and the ratio of the outer layer. The double-layer coating also can obtain better coating effect than the single-layer coating.

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In situ sol-gel synthesis of hyaluronan derivatives bio-nanocomposite hydrogels

Regenerative Biomaterials ◽

10.1093/rb/rbz029 ◽

2019 ◽

Vol 6 (5) ◽

pp. 249-258 ◽

Cited By ~ 2

Author(s):

U D’Amora ◽

A Ronca ◽

M G Raucci ◽

S M Dozio ◽

H Lin ◽

...

Keyword(s):

Sol Gel ◽

Chemical Properties ◽

Filler Concentration ◽

Similar Degree ◽

Nanocomposite Hydrogels ◽

Physico Chemical ◽

Inorganic Fillers ◽

Sol Gel Synthesis ◽

Physical Blending

Abstract The main driving idea of the present study was the comparison between two different chemical modifications of hyaluronic acid (HA) followed by the development of nanocomposite hydrogels directly in situ by biomineralization of photocrosslinkable HA polymers through sol-gel synthesis. In this way, it has been possible to overcome some limitations due to classical approaches based on the physical blending of inorganic fillers into polymer matrix. To this aim, methacrylated and maleated HA, synthesized with similar degree of substitution (DS) were compared in terms of mechanical and physico-chemical properties. The success of in situ biomineralization was highlighted by reflect Fourier transform infrared spectroscopy and thermogravimetric analysis. Furthermore, mechanical characterization demonstrated the reinforcing effect of inorganic fillers evidencing a strong correlation with DS. The swelling behavior resulted to be correlated with filler concentration. Finally, the cytotoxicity tests revealed the absence of toxic components and an increase of cell proliferation over culture time was observed, highlighting these bio-nanocomposite hyaluronan derivatives as biocompatible hydrogel with tunable properties.

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