Nanomaterials Science & Engineering

An Innovative Approach to Wound Dressings: Citric Acid Cross-linked Carboxymethylcellulose-Poly(vinyl alcohol) Hydrogels with Variable Pore Sizes

2025-01-31T09:54:07+00:00

Polyvinyl alcohol (PVA)/carboxymethyl cellulose (CMC) hydrogels were fabricated with varying concentrations of CMC. The hydrogels underwent cross-linking using non-toxic and biocompatible citric acid (CA) in combination with the freeze-thaw technique. FTIR analysis confirmed the hydrogels' chemical structures, while SEM characterization determined their pore diameters and porosity ratios. Hydrogels with diverse porosities exhibited suitable pore diameters for skin cells. Moreover, the hydrogels demonstrated a high swelling capacity, and the augmentation of CMC content resulted in increased water retention capacity. Their water vapor transmission, combined with their swelling properties, highlights their potential as suitable materials for use in wound dressings. These biopolymer-based hydrogels show promise for various applications, including wound dressings and biomimetic artificial skin, effectively replicating the properties of the epidermis and dermis.

Investigation of Damping in Porous Metal Foams

2025-01-31T09:54:08+00:00

Damping in materials and structure is known by the dissipation of energy over time under eventual action of an excitation called force. It is crucial characteristics in various engineering applications including civil engineering, mechanical engineering and aerospace engineering. It contributes to the safety, performances and longevity of these structures as well as the designed damping systems can improve the comfort and reliability of a wide range of engineering applications from everyday vehicles and machine to large scale engineering projects. The aim of this paper is to investigate damping mechanism in porous metal foams, the influence of different parameter such as porosity and microstructure on the damping phenomena and some practical implications. This research unlocks full potential of metal foams for vibration control and energy dissipation, advancing engineering solutions for a wide range of industries.

The influence of T-Shape flow deflector placement on convection heat transfer over an array heated blocks

2025-01-31T09:54:08+00:00

In this research, a numerical study was conducted to examine the convective heat transfer in a horizontal channel containing multiple heated blocks. The channel design incorporates T-shaped flow deflectors strategically positioned downstream of each block. Air, with a Prandtl number of 0.71 and consistent thermal properties, is used for cooling. The geometric attributes and arrangement of the flow deflectors remain consistent throughout the analysis. The computations are based on a Reynolds number of 400, with systematic variations in the positions of the flow deflectors. The finite volume method, implemented using Ansys Fluent© software, is employed to solve the governing mathematical equations numerically. The results emphasize the significant impact of adjustments to the flow deflector configuration on both fluid flow patterns and heat transfer characteristics across the heated blocks.

Nanomaterials Science & Engineering (NMS&E), Vol.7, No.1, 2025

2025-01-31T09:54:08+00:00