scholarly journals Change of Graphene with Various Strategies for Photocatalytic Applications: A Review

2020 ◽  
Vol 14 (1) ◽  
Author(s):  
Whon Chun Oh
Keyword(s):  
Mechanical Properties ◽  
Physicochemical Properties ◽  
H2 Production ◽  
Thermal And Mechanical Properties ◽  
2D Structure ◽  
Photocatalytic Applications

Because of its novel molecular 2D structure and momentous physicochemical properties, graphene has been started a whirlwind of the investigation into its optical, electronic, thermal, and mechanical properties. Specifically, a lot of considerations have been pulled in to investigate graphene and graphene composites for photoelectrochemical applications. Many works have been done to synthesize novel graphene-based materials for applications in photoelectrochemistry, such as photoelectrochemical sunlight-based cells, photocatalytic disintegration of natural contaminations, and H2 production. In this article, we abridge the condition of research on graphene-based materials for photoelectrochemistry. The prospects and further improvements in this energizing field of graphene-based materials are additionally discussed. A B S T R A KKarena struktur 2D dan keunggulan karakteristik fisika-kimia, graphene telah mulai diselidiki secara menyeluruh terhadap sifat optik, elektronik, panas, dan mekanik. Secara khusus, focus dipelukan untuk menyelidiki graphene dan komposit graphene untuk aplikasi fotoelektrokimia. Banyak studi dikerjakan untuk membuat material baru berbasis graphene untuk aplikasi fotoelektrokimia seperti photoelectrochemical sunlight-based cells, fotokatalitik untuk penghilangan kontaminan, dan produksi H2. Pada artikel ini akan disumarisasikan penelitian-penelitian terkait material berbasis graphene untuk aplikasi fotoelektrokimia. Harapan dan perkembangan aplikasi penggunaan material berbasis graphene juga didiskusikan.

scholarly journals Is Dialdehyde Chitosan a Good Substance to Modify Physicochemical Properties of Biopolymeric Materials?

2021 ◽  
Vol 22 (7) ◽  
pp. 3391
Author(s):  
Sylwia Grabska-Zielińska ◽  
Alina Sionkowska ◽  
Ewa Olewnik-Kruszkowska ◽  
Katarzyna Reczyńska ◽  
Elżbieta Pamuła
Keyword(s):  
Mechanical Properties ◽  
Tissue Engineering ◽  
Physicochemical Properties ◽  
Silk Fibroin ◽  
Three Dimensional ◽  
Microscopy Imaging ◽  
Maximum Deformation ◽  
One Step ◽  
Chitosan Blends ◽  
Fourier Transfer Infrared Spectroscopy

The aim of this work was to compare physicochemical properties of three dimensional scaffolds based on silk fibroin, collagen and chitosan blends, cross-linked with dialdehyde starch (DAS) and dialdehyde chitosan (DAC). DAS was commercially available, while DAC was obtained by one-step synthesis. Structure and physicochemical properties of the materials were characterized using Fourier transfer infrared spectroscopy with attenuated total reflectance device (FTIR-ATR), swelling behavior and water content measurements, porosity and density observations, scanning electron microscopy imaging (SEM), mechanical properties evaluation and thermogravimetric analysis. Metabolic activity with AlamarBlue assay and live/dead fluorescence staining were performed to evaluate the cytocompatibility of the obtained materials with MG-63 osteoblast-like cells. The results showed that the properties of the scaffolds based on silk fibroin, collagen and chitosan can be modified by chemical cross-linking with DAS and DAC. It was found that DAS and DAC have different influence on the properties of biopolymeric scaffolds. Materials cross-linked with DAS were characterized by higher swelling ability (~4000% for DAS cross-linked materials; ~2500% for DAC cross-linked materials), they had lower density (Coll/CTS/30SF scaffold cross-linked with DAS: 21.8 ± 2.4 g/cm3; cross-linked with DAC: 14.6 ± 0.7 g/cm3) and lower mechanical properties (maximum deformation for DAC cross-linked scaffolds was about 69%; for DAS cross-linked scaffolds it was in the range of 12.67 ± 1.51% and 19.83 ± 1.30%) in comparison to materials cross-linked with DAC. Additionally, scaffolds cross-linked with DAS exhibited higher biocompatibility than those cross-linked with DAC. However, the obtained results showed that both types of scaffolds can provide the support required in regenerative medicine and tissue engineering. The scaffolds presented in the present work can be potentially used in bone tissue engineering to facilitate healing of small bone defects.

Feasible strategies to promote the sensing performances of spinel MCo2O4 (M = Ni, Fe, Mn, Cu and Zn) based electrochemical sensors: A review

2021 ◽  
Author(s):  
Josué M. Gonçalves ◽  
Diego Pessoa Rocha ◽  
Murillo N.T. Silva ◽  
Paulo Roberto Martins ◽  
Edson Nossol ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Physicochemical Properties ◽  
Electrochemical Sensors ◽  
Combined Effects ◽  
Cu And Zn

Spinel MCo2O4 (M = Ni, Fe, Mn, Cu and Zn) demonstrates excellent physicochemical properties due to combined effects of M2+ and Co2+ cations. Their inimitable optical, electronic, and mechanical properties...

Polyamides containing a biorenewable aromatic monomer based on coumalate esters: from synthesis to evaluation of the thermal and mechanical properties

2021 ◽  
Vol 12 (16) ◽  
pp. 2379-2388
Author(s):  
Jules Stouten ◽  
Aleksandra A. Wróblewska ◽  
Glenn Grit ◽  
Jurrie Noordijk ◽  
Bert Gebben ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Propionic Acid ◽  
Terephthalic Acid ◽  
Thermal And Mechanical Properties ◽  
Aromatic Polyamides ◽  
Aromatic Monomer

A new biobased alternative for terephthalic acid (TPA) in (semi-)aromatic polyamides is proposed, namely 4-carboxybenzene propionic acid (4CBPA).

scholarly journals Thermal and mechanical properties of epoxy resin reinforced with modified iron oxide nanoparticles

2021 ◽  
pp. 50533
Author(s):  
Yasmine N. Baghdadi ◽  
Lucia Youssef ◽  
Kamal Bouhadir ◽  
Mohammad Harb ◽  
Samir Mustapha ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Iron Oxide ◽  
Epoxy Resin ◽  
Iron Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Thermal And Mechanical Properties

scholarly journals Effect of Organic Modifier Types on the Physical–Mechanical Properties and Overall Migration of Post-Consumer Polypropylene/Clay Nanocomposites for Food Packaging

Polymers ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1502
Author(s):  
Eliezer Velásquez ◽  
Sebastián Espinoza ◽  
Ximena Valenzuela ◽  
Luan Garrido ◽  
María José Galotto ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Food Packaging ◽  
Clay Nanocomposites ◽  
Organic Modifier ◽  
Thermal And Mechanical Properties ◽  
Chemical Safety ◽  
Elongation At Break ◽  
Fatty Food ◽  
Recycled Plastics ◽  
Thermal Stability Of

The deterioration of the physical–mechanical properties and loss of the chemical safety of plastics after consumption are topics of concern for food packaging applications. Incorporating nanoclays is an alternative to improve the performance of recycled plastics. However, properties and overall migration from polymer/clay nanocomposites to food require to be evaluated case-by-case. This work aimed to investigate the effect of organic modifier types of clays on the structural, thermal and mechanical properties and the overall migration of nanocomposites based on 50/50 virgin and recycled post-consumer polypropylene blend (VPP/RPP) and organoclays for food packaging applications. The clay with the most hydrophobic organic modifier caused higher thermal stability of the nanocomposites and greater intercalation of polypropylene between clay mineral layers but increased the overall migration to a fatty food simulant. This migration value was higher from the 50/50 VPP/RPP film than from VPP. Nonetheless, clays reduced the migration and even more when the clay had greater hydrophilicity because of lower interactions between the nanocomposite and the fatty simulant. Conversely, nanocomposites and VPP/RPP control films exhibited low migration values in the acid and non-acid food simulants. Regarding tensile parameters, elongation at break values of PP film significantly increased with RPP addition, but the incorporation of organoclays reduced its ductility to values closer to the VPP.

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