N-Vinylcaprolactam grafting onto cotton gauze by gamma radiation for loading and controlled release of antibacterial silver nanoparticles

AbstractTo contribute to the development of new alternatives in the area of polymers for biomedical applications, the surface modification of a cotton gauze grafted with a N-vinylcaprolactam (NVCL) by ionizing gamma radiation was developed, in to provide it with more physical and chemical properties. To verify that the grafting was successful, the samples were analyzed and characterized by attenuated total reflectance, by Fourier transform infrared spectroscopy, differential scanning calorimetry, and thermogravimetric analysis. The grafted samples showed greater hydrophilicity and affinity with drugs, as well as a critical solution temperature between 33 and 40 °C; therefore, this material was implemented as administrator of AgNPs in controlled doses, thus obtaining a material with greater absorption, anti-inflammatory and with antimicrobial characteristics.

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Identification of Amber and the Copal under Heat Pressurized Process

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.554-556.2112 ◽

2012 ◽

Vol 554-556 ◽

pp. 2112-2115

Author(s):

Hui Li ◽

Xuan Wang ◽

Yong Zhu ◽

Qin Ren

Keyword(s):

Chemical Properties ◽

Peak Position ◽

Exothermic Peak ◽

Endothermic Peak ◽

Scanning Calorimetry ◽

Natural Resin ◽

Before And After ◽

Artificial Heat ◽

Physical And Chemical ◽

And Chemical Properties

Amber and copal belong to the natural resin, which are similar and transitional in the physical and chemical properties. The artificial heat-pressurized treatment is contributed to the polymerization of the natural copal, and turns into green, yellow-green and deep orange-yellow copal. It is very difficult to identify amber from the heat- pressurized treatment copal only based on the gemological parameters.The thermal behavior of amber and the copal before and after heat-pressurized treatment were analyzed by means of differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy(FTIR) and nuclear magnetic resonance(NMR). The results show that amber exists an evident endothermic peak around 123~132°C, and copal reveals an obvious endothermic peak at about 174~178°C, and the heat pressurized treatment copal occurs a clear exothermic peak around 150~152°C. The differences between endothermic or exothermic transition and peak position reveal occurring thermal oxidation or the bond breaking or the melting, which are of great significance in the identification.

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Carbon Dots: Synthesis, Properties and Biomedical Applications

Journal of Materials Chemistry B ◽

10.1039/d1tb01077h ◽

2021 ◽

Author(s):

Guili Ge ◽

Lin Li ◽

Dan Wang ◽

Mingjian Chen ◽

Zhaoyang Zeng ◽

...

Keyword(s):

Carbon Dots ◽

Biomedical Applications ◽

Chemical Properties ◽

Physical And Chemical Properties ◽

Synthesis Properties ◽

New Type ◽

Low Toxicity ◽

Good Biocompatibility ◽

Physical And Chemical ◽

And Chemical Properties

Carbon dots (CDs) are a new type of carbon nanomaterial that have unique physical and chemical properties, good biocompatibility, low toxicity, easy surface functionalization, making them widely used in biological...

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Synthesis and Characteristics of Energetic Materials Based on 1,2-Dinitroguanidine

Australian Journal of Chemistry ◽

10.1071/ch14060 ◽

2014 ◽

Vol 67 (7) ◽

pp. 1037 ◽

Cited By ~ 2

Author(s):

Bingcheng Hu ◽

Xinghui Jin ◽

Huanqing Jia ◽

Zuliang Liu ◽

Chunxu Lv

Keyword(s):

Mass Spectrometry ◽

Energetic Materials ◽

Chemical Properties ◽

Detonation Properties ◽

Physical And Chemical Properties ◽

Scanning Calorimetry ◽

Energetic Salts ◽

Thermal Kinetic Parameters ◽

Physical And Chemical ◽

And Chemical Properties

A series of energetic salts based on 1,2-dinitroguanidine were successfully synthesised and fully characterised using 1H NMR, 13C NMR, and IR spectroscopy, mass spectrometry, elemental analysis, and differential scanning calorimetry. The results show that all the salts possess higher detonation properties (detonation pressures and velocities ranging from 24.8 to 30.3 GPa and 7665 to 8422 m s–1, respectively) than those of trinitrotolouene (TNT, 2,4,6-trinitromethylbenzene). The thermal stability and thermal kinetic parameters were also investigated to give a better understanding of the physical and chemical properties of these energetic salts.

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Degradation of Plasticized Poly(1-chloroethylene) Waterproofing Membranes used as a Building Material

Acta Chimica Slovenica ◽

10.17344/acsi.2020.6464 ◽

2021 ◽

Vol 68 (2) ◽

pp. 494-504

Author(s):

Gregor Kravanja ◽

Andrej Ivanič ◽

Samo Lubej

Keyword(s):

Morphological Changes ◽

Chemical Properties ◽

Attenuated Total Reflection ◽

Scanning Calorimetry ◽

Cross Sectional ◽

Roof Area ◽

Breaking Points ◽

Flat Roof ◽

Physical And Chemical ◽

And Chemical Properties

In the present work, both unused plasticized poly(1-chloroethylene) membranes and membranes taken from a flat roof area were comprehensively analysed. First, tensile strength and elongation at breaking points were determined, followed by measurements of wettability. Secondly, morphological changes were analysed using scanning electron microscopy (SEM). To study chemical changes in aged membranes, Fourier transform infrared spectroscopy (FTIR) analysis in the attenuated total reflection mode (ATR) was used. Finally, thermogravimetric analysis and differential scanning calorimetry (TGA-DSC) were performed simultaneously to study thermal degradation. The results show obvious changes in the mechanical, physical and chemical properties of membranes caused by plasticizer loss. Surface microstructure becomes stiffer, which leads to contractions and the prevalence of voids. In cross-sectional area, average thickness values decrease. Due to the degradation of the plasticized waterproofing membranes, the roofing area had to be completely replaced.

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2D Materials for Environment, Energy, and Biomedical Applications

Journal of Biomedical Research & Environmental Sciences ◽

10.37871/jbres1340 ◽

2021 ◽

Vol 2 (10) ◽

pp. 977-984

Author(s):

Divya Chauhan ◽

Mohammad Ashfaq ◽

Neetu Talreja ◽

Ramalinga Viswanathan Managalraja

Keyword(s):

Electronic Structure ◽

Biomedical Applications ◽

Short Communication ◽

Biomedical Application ◽

2D Materials ◽

Chemical Properties ◽

Physical And Chemical Properties ◽

Energy Environment ◽

Physical And Chemical ◽

And Chemical Properties

Recently 2D materials are booming in the field of energy, environment, and biomedical application. Incorporation of metal/non-metal within 2D materials significantly influences the physical and chemical properties, making them intriguing materials for various applications. The advancement of 2D material requires strategic modification by manipulating the electronic structure, which remains a challenge. Herein, we describe 2D materials for the environment, energy, and biomedical application. A predominant aim of this short communication is to summarize the literature on the advanced environment, energy, and biomedical application (especially COVID-19).

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ADIATION SHIELDING EFFECT OF BASALT CONCRETE; AN EXPERIMENTAL APPROACH

JOURNAL OF MECHANICS OF CONTINUA AND MATHEMATICAL SCIENCES ◽

10.26782/jmcms.2020.11.00014 ◽

2020 ◽

Vol 15 (11) ◽

Author(s):

Engr. Furqan Wali

Keyword(s):

Gamma Radiation ◽

Experimental Approach ◽

Coarse Aggregate ◽

Chemical Properties ◽

Shielding Effect ◽

Coarse Aggregates ◽

Water To Cement Ratio ◽

Physical And Chemical ◽

Specific Reason ◽

And Chemical Properties

This paper presents an assessment of gamma radiation performance, specifically in terms of attenuation energy, of concrete containing coarse aggregate having different physical and chemical properties. Basalt being heavier and somehow having high specific gravity is likely to have a good performance against gamma radiation. Through this paper, the author has made a comparison between the concrete having different coarse aggregates, normal aggregate phase and basaltic aggregate phase by evaluating the attenuation energies of both the phases at the Institute of Radiotherapy and Nuclear Medicine (IRNUM) Peshawar. Also, the water to cement ratio (W/C) for both the phases was distinguished i.e. 3.5 and 5.7 to make the results more promising and enabling to make the comparison effective. The test was likely to be conducted on Molds having 10 cm by 10 cm cross-section of each W/C ratio with varying thickness of about 2cm and will lead up to 10cm. The detecting device used was a phoenix teletherapy machine operating with a former type ionization chamber having an energy of 1.25 MeV. The source of radiation was Cobalt 60. The results indicated that basalt despite having strong physical properties is insufficient to be used for Gamma shielding. The two materials vary very little, so it is negligible to be used for a specific reason.

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BIOMEDICAL APPLICATIONS OF ELECTROSPUN NANOFIBERS

Surface Review and Letters ◽

10.1142/s0218625x20300014 ◽

2020 ◽

Vol 27 (11) ◽

pp. 2030001

Author(s):

ZHANG YANCONG ◽

DOU LINBO ◽

MA NING ◽

WU FUHUA ◽

NIU JINCHENG

Keyword(s):

Biomedical Applications ◽

Three Dimensional ◽

Chemical Properties ◽

Electrospun Nanofibers ◽

High Porosity ◽

Nanofiber Diameter ◽

Surface Microscopy ◽

Different Shapes ◽

Physical And Chemical ◽

And Chemical Properties

Electrospun technology is a simple and flexible method for preparation of nanofiber materials with unique physical and chemical properties. The nanofiber diameter is adjustable from several nanometers to few microns during the preparation. Electrospun nanofiber materials are easy to be assembled into different shapes of three-dimensional structures. These materials exhibit high porosity and surface area and can simulate the network structures of collagen fibers in a natural extracellular matrix, thereby providing a growth microenvironment for tissue cells. Electrospun nanofibers therefore have extensive application prospects in the biomedicine field, including in aerospace, filtration, biomedical applications, and biotechnology. Nanotechnology has the potential to revolutionize many fields, such as surface microscopy, silicon fabrication, biochemistry, molecular biology, physical chemistry, and computational engineering, while the advent of nanofibers has increased the understanding of nanotechnology among academia, industry, and the general public. This paper mainly introduces the application of nanofiber materials in tissue engineering, drug release, wound dressing, and other biomedicine fields.

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Crosslinking Collagen Constructs: Achieving Cellular Selectivity Through Modifications of Physical and Chemical Properties

Applied Sciences ◽

10.3390/app10196911 ◽

2020 ◽

Vol 10 (19) ◽

pp. 6911

Author(s):

Malavika Nair ◽

Serena M. Best ◽

Ruth E. Cameron

Keyword(s):

Tissue Engineering ◽

Cell Viability ◽

Biomedical Applications ◽

Engineering Application ◽

Chemical Properties ◽

Tissue Engineering Application ◽

Physical And Chemical Properties ◽

Crosslinking Process ◽

Physical And Chemical ◽

And Chemical Properties

Collagen-based constructs have emerged in recent years as ideal candidates for tissue engineering implants. For many biomedical applications, collagen is crosslinked in order to improve the strength, stiffness and stability of the construct. However, the crosslinking process may also result in unintended changes to cell viability, adhesion or proliferation on the treated structures. This review provides a brief overview of some of both the most commonly used and novel crosslinkers used with collagen, and suggests a framework by which crosslinking methods can be compared and selected for a given tissue engineering application.

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Perspective liquid scintillators for spectrometry of neutron and gamma radiation

EPJ Web of Conferences ◽

10.1051/epjconf/202022505006 ◽

2020 ◽

Vol 225 ◽

pp. 05006

Author(s):

Kawa Haji Mahmoud ◽

Vaclav Prenosil ◽

Zdenek Matej ◽

Frantisek Kucera ◽

Filip Mravec ◽

...

Keyword(s):

Gamma Radiation ◽

Chemical Properties ◽

Scintillation Detectors ◽

Physical And Chemical Properties ◽

Chemical Bonds ◽

Organic Scintillators ◽

Mixed Field ◽

Physical And Chemical ◽

And Chemical Properties

This paper presents some results of the development of two new scintillation detectors usable for the detection and spectrometry of neutron and photon components of the mixed field. It is a series of liquid organic scintillators containing carbon, hydrogen, nitrogen and oxygen. Elements of individual scintillator designs are arranged in various chemical bonds defining physical and chemical properties of the scintillators. These scintillators have advantageous useful properties. They are non-hygroscopic, not poisonous and are not sensitive to contact with the outside atmosphere and can be stored in conventional laboratory containers.

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