scholarly journals Medical Plaster Enhancement by Coating with Cistus L. Extracts within a Chitosan Matrix: From Natural Complexity to Health Care Simplicity

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 582
Author(s):  
Monika Haponska ◽  
Paulina Modrakowska ◽  
Karolina Balik ◽  
Anna Bajek ◽  
Anne Coloigner ◽  
...  
Keyword(s):  
Environmental Scanning Electron Microscopy ◽  
Dip Coating ◽  
Radiation Dermatitis ◽  
Environmental Scanning ◽  
Chitosan Derivative ◽  
Standard Medium ◽  
Healing Environment ◽  
Chitosan Matrix ◽  
Diphenyltetrazolium Bromide

Our investigation was focused on the preparation and characterization of novel plasters based on Carboxymethyl Chitosan derivative (CMC), to be used for the treatment of radiation dermatitis with Biologic Active Compounds (BACs) in a moist wound-healing environment. After performing the extraction and characterization of BACs from Cistus L., we optimized the BACs/CMC solution for subsequent plaster preparation. Then, plasters were prepared by dip-coating with a different number of layers, and we characterized them by Environmental Scanning Electron Microscopy (ESEM), Contact Angle (CA) and release tests in water for 24 h. Taking into account the flexibility of the plasters and the amount of released BACs after 24 h, the sample obtained after two dip-coating steps (2La) appeared promising in regard to comfortable mechanical properties and active principles administration. The 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) test performed on keratinocytes cultured in standard medium shows that cells treated with released extract from 2La start to proliferate, extend cellular viability and form colonies typical for epidermal cells.

Characterization of Thin Polymer Blend Films using ESEM – No Charging, No Staining.

2001 ◽  
Vol 707 ◽  
Author(s):  
Ian C. Bache ◽  
Catherine M. Ramsdale ◽  
D. Steve Thomas ◽  
Ana-Claudia Arias ◽  
J. Devin MacKenzie ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Environmental Scanning Electron Microscopy ◽  
Environmental Scanning ◽  
Cross Sectional ◽  
Blend Films ◽  
Thin Polymer ◽  
Device Applications ◽  
Scanning Electron

ABSTRACTCharacterising the morphology of thin films for use in device applications requires the ability to study both the structure within the plane of the film, and also through its thickness. Environmental scanning electron microscopy has proved to be a fruitful technique for the study of such films both because contrast can be seen within the film without the need for staining (as is conventionally done for electron microscopy), and because cross-sectional images can be obtained without charging artefacts. The application of ESEM to a particular blend of relevance to photovoltaics is described.

scholarly journals Development and Characterization of Novel Active Chitosan Films Containing Fennel and Peppermint Essential Oils

Coatings ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 936 ◽  
Author(s):  
Ting Liu ◽  
Jingfan Wang ◽  
Fumin Chi ◽  
Zhankun Tan ◽  
Liu Liu
Keyword(s):  
Essential Oil ◽  
Composite Films ◽  
Environmental Scanning Electron Microscopy ◽  
Chitosan Film ◽  
Environmental Scanning ◽  
The Novel ◽  
Scanning Calorimetry ◽  
Chitosan Films ◽  
Water Swelling

The effects of fennel essential oil (FEO) and peppermint essential oil (PEO) on chitosan-based films were evaluated in this study. The results showed that the addition of FEO and PEO slightly increased the density and thickness, while significantly decreasing the moisture content, water swelling, and solubility properties. The color values (L, a, b, ΔE and whiteness index (WI)) of the composite films containing FEO and PEO changed obviously with a tendency toward yellowness, which was beneficial in resisting food decomposition caused by ultraviolet light. The differential scanning calorimetry (DSC) and fourier-transform-infrared (FTIR) results indicated that the addition of FEO and PEO affected the structure of the chitosan films, while the interaction between the chitosan and polyphenols in FEO and PEO established new hydrogen bonds and improved the thermal stability. The environmental scanning electron microscopy (ESEM) illustrated that the surfaces of the composite films containing FEO and PEO were smooth, but the cross-section was rougher than in pure chitosan film. Furthermore, the composite films containing FEO and PEO exhibited prominent antioxidant activity. In short, the novel active chitosan-based films with incorporated FEO and PEO present broad application prospects in fresh-cut meat or vegetable packaging.

Developments in characterizing soft matter

MRS Bulletin ◽  
2010 ◽  
Vol 35 (9) ◽  
pp. 702-707 ◽  
Author(s):  
Athene M. Donald
Keyword(s):  
Soft Matter ◽  
Complex Fluids ◽  
High Vacuum ◽  
Environmental Scanning Electron Microscopy ◽  
Microstructural Characterization ◽  
Inorganic Materials ◽  
Environmental Scanning ◽  
Conductive Material ◽  
Scanning Electron

Soft matter—also known as complex fluids—is a field of growing interest and importance, spanning many classes of materials, including polymers, biopolymers, colloids, and liquid crystals. Different approaches for microstructural characterization are more appropriate than those used for hard (and usually fully crystallized) materials such as metals and inorganic materials because of the time and length scales involved. This article discusses a range of techniques applicable to the characterization of soft matter, including environmental scanning electron microscopy (SEM) and microrheology. The former offers two key advantages for this class of material over conventional SEM because it requires neither a high vacuum—which is a problem for hydrated samples—nor that an insulator be coated with a conductive material. Microrheology is well suited to small volumes of fluid with low moduli that may be heterogeneous; it is capable of measuring gelation in real time.

Structural characterization of unsaturated aggregated soil

2010 ◽  
Vol 47 (3) ◽  
pp. 297-311 ◽  
Author(s):  
A. Koliji ◽  
L. Vulliet ◽  
L. Laloui
Keyword(s):  
Soil Structure ◽  
Mercury Intrusion Porosimetry ◽  
Experimental Studies ◽  
Environmental Scanning Electron Microscopy ◽  
Structural Evolution ◽  
Environmental Scanning ◽  
Comprehensive Understanding ◽  
Soil Fabric ◽  
Macroscopic Response

Despite the recent experimental studies of soil structure, a comprehensive understanding of the macroscopic response of a soil in relation to its structure has not yet been achieved. This lack of understanding reveals the need for further assessments of soil structure and its evolution under loading. In this work, the structure of an aggregated soil under various conditions of saturation and mechanical loading is studied. We also compare the aggregated soil structure, which shows a double porous fabric, with that of the same soil when reconstituted. The experimental methods selected for this study are a combination of mercury intrusion porosimetry (MIP), environmental scanning electron microscopy (ESEM), and neutron computed tomography (CT). Using MIP and ESEM, we first examine the soil fabric at the intra-aggregate scale. Then, we quantify the structural evolution of the soil using neutron tomography and link it to the macroscopic response of the soil. Based on the experimental evidence, the main features of the soil structure and its evolution are outlined for unsaturated aggregated soil under different loading conditions.

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