Manufacture and Characterization of Alginate-CMC-Dextran Hybrid Double Layer Superabsorbent Scaffolds

This study focused on the manufacturing of functional superabsorbent sponges using natural polymers. An alginate/CMC-embedded dextran hybrid dual-layer formulation was prepared using the freeze-drying method. The physical properties of the formulation were characterized using a field emission scanning electron microscope and a universal testing machine, and the swelling ratio was calculated. Cell viability assays were performed using keratinocytes (HaCaT cells). The results showed that this formulation can absorb a large amount of moisture and provide morphological stability through its tensile strength and uniform porosity, and this was verified by its biocompatibility. We believe that in the future, by combining this novel hybrid dual-layer superabsorbent sponge with antibacterial agents with excellent porosity, it would serve as a medical material for producing bandages that can absorb blood and body fluids, feminine hygiene products, and functional antibacterial masks.

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Fabrication and Characterization of Porous Biphasic Calcium Phosphate Scaffolds by Doping TiO2

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.747.190 ◽

2013 ◽

Vol 747 ◽

pp. 190-193 ◽

Cited By ~ 1

Author(s):

Naruporn Monmaturapoj ◽

Witoon Thepsuwan

Keyword(s):

Freeze Drying ◽

Testing Machine ◽

Minor Phase ◽

X Ray ◽

Gel Casting ◽

Universal Testing ◽

Xrd Patterns ◽

A Minor ◽

Highly Porous

This study aims to improve the strength of porous BCP samples by the addition of titanium dioxide (TiO2), the well known biocompatible and strong ceramic. BCP powder with HA/TCP ratio of 70/30 (BCP7030) obtained by mixing a pure HA and β-TCP powder. TiO2 powder with 2 (BCP_2Ti), 5 (BCP_5Ti) and 10 (BCP_10Ti) %wt were added into the BCP7030 powder, then ball milled in ethanol for 6 hrs. The porous samples were fabricated by the combination of the gel-casting and freeze drying techniques. All samples were sintered at 1100°C for 2 hrs. X-ray diffractometry (XRD) and scanning electron microscopy (SEM) were used to determine crystal structures and morphology of the sintered samples, respectively. Mechanical properties and porosity of samples were measured by using the universal testing machine and Archimedess principle, respectively. XRD results showed that the phases of the undoped sample can be indexed HA and β-TCP with the ratio of 70/30 as the major phases. In BCP_2Ti, CaTiO3 was observed as a minor phase among the crystallization of HA and β-TCP with the proportion of 30:70. Meanwhile, in BCP_5Ti and BCP_10Ti, XRD patterns revealed a completely transformation of HA to β-TCP with minor phases of CaTiO3 and TiO2. The microstructure of sintered samples present highly porous structure which consisted of two-dimensional pore channels along the long axis and the short axis, which replicates the ice and pore orientation in the direction of freezing. Relatively, the porosity of the samples was increased with the amount of TiO2. Surprisingly, an additions of the TiO2 was not rather improved the mechanical strength of porous BCP7030 in this study. This might be a result of a high percentage of porosity (84%).

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Characterization of Composite Laminates Subjected to Repeated Indentation

Advances in Materials Science ◽

10.2478/adms-2014-0009 ◽

2014 ◽

Vol 14 (2) ◽

pp. 46-56

Author(s):

M. Ashok Kumar ◽

A.M.K. Prasad ◽

D.V. Ravishankar ◽

G. Giridhar

Keyword(s):

Stainless Steel ◽

Bearing Capacity ◽

Fiber Orientation ◽

Composite Laminates ◽

Testing Machine ◽

High Strength ◽

Surface Damage ◽

Load Bearing Capacity ◽

Universal Testing

Abstract The effect of the fiber orientation in a laminate is investigated experimentally when subjected repeated quasistatic indentation. All the laminates with different fiber orientation are subjected to indentation with a stainless steel spherical indenter of diameter 8.0mm on a universal testing machine for a maximum indenter displacement of 4mm. The rate of indenter displacement was 0.5mm/minute. Different parameters like load bearing capacity, indentation diameter, area of surface damage, etc., were recorded after 4mm of indenter displacement. All the parameters were studied and compared to evaluate the laminate with high strength

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Preparation and characterization of aligned porous PCL/zein scaffolds as drug delivery systems via improved unidirectional freeze-drying method

Materials Science and Engineering C ◽

10.1016/j.msec.2016.06.009 ◽

2016 ◽

Vol 68 ◽

pp. 613-622 ◽

Cited By ~ 46

Author(s):

Zeinab Fereshteh ◽

Mohammadhossein Fathi ◽

Akbar Bagri ◽

Aldo R. Boccaccini

Keyword(s):

Drug Delivery ◽

Drug Delivery Systems ◽

Freeze Drying ◽

Delivery Systems ◽

Drying Method

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Synthesis and Characterization of Red Mud and Sawdust Based Geopolymer Composites as Potential Construction Material

Materials Science Forum ◽

10.4028/www.scientific.net/msf.923.130 ◽

2018 ◽

Vol 923 ◽

pp. 130-134 ◽

Cited By ~ 1

Author(s):

Ing Kong ◽

Kay Min Khoo ◽

Oliver Buddrick ◽

Abdul Aziz Baharuddin ◽

Pooria Khalili

Keyword(s):

Compressive Strength ◽

Red Mud ◽

Raw Materials ◽

Construction Material ◽

Testing Machine ◽

Industrial Wastes ◽

Sem Images ◽

Universal Testing ◽

Geopolymer Composites

The aim of this study was to synthesize the geopolymer composites formed by two industrial wastes, namely red mud (RM) and saw dust (SD). SD was chemically treated with alkali for the removal of lignin and subsequently bleached, before forming composite with acid-modified RM. The composites were then characterized by using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), thermogravimetic analysis (TGA) and universal testing machine to study the morphology, chemical, thermal and mechanical properties. The FTIR spectrum showed that Si and Al from the raw materials played the major role in forming aluminosilicate geopolymer composites. The SEM images revealed that SD and RM particles aggregated to form fully condensed geopolymer matrices with high compressive strength of 8.3-138 MPa, which were comparable to Portland cement (compressive strength of 9-20.7 MPa).

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Preparation and Characterization of Polysulfone Membrane for Gas Separation

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.917.307 ◽

2014 ◽

Vol 917 ◽

pp. 307-316 ◽

Cited By ~ 2

Author(s):

Norwahyu Jusoh ◽

Lau Kok Keong ◽

Azmi Mohd Shariff

Keyword(s):

Polymer Concentration ◽

Testing Machine ◽

Skin Layer ◽

Polysulfone Membrane ◽

Thermogravimetric Analyzer ◽

Membrane Fabrication ◽

Universal Testing ◽

Infra Red ◽

Methyl Pyrrolidone

Symmetric and asymmetric polysulfone membranes were fabricated using different of solvents; N-methyl-pyrrolidone (NMP), Tetrahydrofuran (THF) and Dimethylacetamide (DMAC) at different polymer concentration (15 and 20%) to study the influence of varying type of solvents and polymer concentration in membrane fabrication. The membranes were characterized using Field Emission Scanning Electron Microscopy (FESEM), Thermogravimetric Analyzer (TGA), Universal Testing Machine (UTM) and Fourier Transform Infra-Red (FTIR).The results disclosed that the symmetric, higher polymer concentration membrane contributed to better thermal and mechanical stabilities. PSF/THF membrane showed good mechanical strength while PSF/DMAC membrane illustrated great thermal stability. 20% of polymer concentration and PSF/THF membrane led to the thicker skin layer and dense structure formation.

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Sound absorption characteristics of KGM-based aerogel

International Journal of Low-Carbon Technologies ◽

10.1093/ijlct/ctaa005 ◽

2020 ◽

Vol 15 (3) ◽

pp. 450-457

Author(s):

Yixin Wang ◽

Fei Xiang ◽

Wei Wang ◽

Weiling Wang ◽

Yuehong Su ◽

...

Keyword(s):

Pore Structure ◽

Sound Absorption ◽

Freeze Drying ◽

Drying Method ◽

Absorption Potential ◽

Absorption Performance ◽

Property Characterization ◽

High Sound ◽

Absorption Characteristics

Abstract This study presents the preparation and property characterization of biomass aerogels as sound absorption materials. Biomasses were chosen to prepare aerogels through the freeze-drying method. Results indicated that four components may have different effects on the aerogel pore structure, and the aerogel formula was thus optimized to reach the best sound absorption. Within the experimental range, biomass aerogel with the optimized formula had an average sound efficiency 0.352, density 0.047 g/cm3 and porosity 94.46 ± 0.04%. It shows better sound absorption performance than traditional sound absorption cotton. These results demonstrate the high sound absorption potential of biomass aerogels for building applications.

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New Collagen-Dextran-Zinc Oxide Composites for Wound Dressing

Journal of Nanomaterials ◽

10.1155/2016/5805034 ◽

2016 ◽

Vol 2016 ◽

pp. 1-7 ◽

Cited By ~ 25

Author(s):

Georgeta Păunica-Panea ◽

Anton Ficai ◽

Minodora Maria Marin ◽

Ștefania Marin ◽

Mădălina Georgiana Albu ◽

...

Keyword(s):

Zinc Oxide ◽

Wound Dressing ◽

Freeze Drying ◽

Biological Behavior ◽

Design Development ◽

Natural Polymers ◽

Rheological Analysis ◽

Structure Morphology ◽

Oxide Composites

The goal of this paper was the design, development, and characterization of some new composites, based on collagen and dextran as natural polymers and zinc oxide as antimicrobial, to be used in wound healing. Collagen hydrogels with various concentrations of dextran and zinc oxide were investigated in terms of rheological analysis. The spongious composites, obtained by freeze-drying of hydrogels, were evaluated by morphology (SEM), water uptake, and biological (enzymatic biodegradation) analysis. All the results were strongly influenced by the nature and concentration of composite components. Based on the performances of the hydrogels, stationary rheometry, porous structure, morphology, and biological behavior, the antimicrobial spongious composite based on collagen and dextran with 50% ZnO were the most promising for future applications in wound dressing and a biomaterial with high potential in skin regeneration.

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Fabrication and Characterization of Macroporous Chitosan/PVA Composite Sponges for Wound Dressing

MRS Proceedings ◽

10.1557/opl.2014.41 ◽

2014 ◽

Vol 1626 ◽

Cited By ~ 1

Author(s):

Changfeng Chen ◽

Li Liu ◽

Qiong Wang ◽

Tao Huang ◽

Yue`e Fang

Keyword(s):

Wound Dressing ◽

Freeze Drying ◽

Transmission Rate ◽

High Water ◽

Poly Vinyl Alcohol ◽

Drying Method ◽

Moisture Permeability ◽

Liquid Absorption ◽

Fabrication And Characterization

ABSTRACTThe present investigation involves the synthesis of chitosan based composite sponges in view of their applications in wound dressing, antibacterial and haemostatic. A facile CO2 bubbles template freeze-drying method was developed for the fabrication of macroporous chitosan- poly(vinyl alcohol) (PVA) composite sponges with a typical porosity of 50% and pore size of 100-300 µm. The composite sponges show a high water absorption rate up to 60 times of its weight and a water vapor transmission rate of 30 ∼ 70g/m2 • h. Effects of the content of cross-linking agent and PVA on mechanical properties and moisture permeability were examined. Improved strength and flexibility of the chitosan sponges were observed with the presence of PVA. Further, the antibacterial and haemostatic activities have been demonstrated. The Chitosan/PVA sponges of high liquid absorption, appropriate moisture permeability, excellent antimicrobial and haemostatic activities have a great potential for wound dressing applications.

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