scholarly journals Towards a new generation of functional fiber-based packaging: cellulose nanofibers for improved barrier, mechanical and surface properties

Cellulose ◽  
2017 ◽  
Vol 25 (1) ◽  
pp. 683-695 ◽  
Author(s):  
Quim Tarrés ◽  
Helena Oliver-Ortega ◽  
Paulo J. Ferreira ◽  
M. Àngels Pèlach ◽  
Pere Mutjé ◽  
...  
Keyword(s):  
Surface Properties ◽  
Cellulose Nanofibers ◽  
Functional Fiber ◽  
New Generation

A versatile method for producing functionalized cellulose nanofibers and their application

Nanoscale ◽  
2016 ◽  
Vol 8 (6) ◽  
pp. 3753-3759 ◽  
Author(s):  
Pei Huang ◽  
Yang Zhao ◽  
Shigenori Kuga ◽  
Min Wu ◽  
Yong Huang
Keyword(s):  
Ball Milling ◽  
Surface Properties ◽  
Cellulose Nanofibers ◽  
Cellulose Nanofiber ◽  
One Step

Individual dispersed cellulose nanofibers can be produced through ball milling by adding anhydride and DMAP in one step. By altering the type of anhydride, the cellulose nanofiber presents different surface properties and tailored compatibility with varied solvents or matrices, which greatly promote the massive applications of cellulose nanofibers.

scholarly journals On the Path to a New Generation of Cement-Based Composites through the Use of Lignocellulosic Micro/Nanofibers

Materials ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1584 ◽  
Author(s):  
Rafel Reixach ◽  
Josep Claramunt ◽  
M. Àngel Chamorro ◽  
Joan Llorens ◽  
M. Mercè Pareta ◽  
...  
Keyword(s):  
Flexural Strength ◽  
Low Cost ◽  
Water Immersion ◽  
Cellulose Nanofibers ◽  
Cement Matrix ◽  
Mechanical And Thermal Properties ◽  
Pine Sawdust ◽  
Potential Applications ◽  
Extended Surface ◽  
New Generation

Due to its high biocompatibility, bio-degradability, and low cost, cellulose finds application in disparate areas of research. Here we focus our attention on the potential applications of cellulose nanofiber in cement-based materials for the building sector. We first describe the chemical/morphological composition of cellulose fibers, their process and treatment, the characterization of cement-based composites, and their flexural strength. In recent research in this field, cellulose has been considered in the form of nano-sized particles, i.e., cellulose nanofibers (CNF) or cellulose nanocrystals (CNC). CNF and CNC are used for several reasons, including their mechanical and thermal properties, their extended surface area and low toxicity. This study presents some potential applications of lignocellulosic micro/nanofibers (LCMNF) in cement-based composites in order to improve flexural strength. Samples were made with 0.5-1.0-1.5-2.0 wt% of LCMNF obtained from pine sawdust, CEM I (Portland) and a 1:3 cement-water ratio. The composites were then tested for flexural strength at 7, 14, and 28 days and the evolution of flexural strength was assessed after water immersion during 72 h. Scanning electron microscopy was employed to visualize the bond between LCMNF and the cement matrix. Results showed that LCMNF improved the flexural strength of the composite in all the dosages used.

scholarly journals Materials for Orthopedic Bioimplants: Modulating Degradation and Surface Modification Using Integrated Nanomaterials

Coatings ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 264 ◽  
Author(s):  
Harbhajan Ahirwar ◽  
Yubin Zhou ◽  
Chinmaya Mahapatra ◽  
Seeram Ramakrishna ◽  
Prasoon Kumar ◽  
...  
Keyword(s):  
Surface Modification ◽  
Surface Properties ◽  
Bone Repair ◽  
Abiotic Factors ◽  
Antibacterial Activities ◽  
Host Acceptance ◽  
Factors Affecting ◽  
Significant Research ◽  
And Performance ◽  
New Generation

Significant research and development in the field of biomedical implants has evoked the scope to treat a broad range of orthopedic ailments that include fracture fixation, total bone replacement, joint arthrodesis, dental screws, and others. Importantly, the success of a bioimplant depends not only upon its bulk properties, but also on its surface properties that influence its interaction with the host tissue. Various approaches of surface modification such as coating of nanomaterial have been employed to enhance antibacterial activities of a bioimplant. The modified surface facilitates directed modulation of the host cellular behavior and grafting of cell-binding peptides, extracellular matrix (ECM) proteins, and growth factors to further improve host acceptance of a bioimplant. These strategies showed promising results in orthopedics, e.g., improved bone repair and regeneration. However, the choice of materials, especially considering their degradation behavior and surface properties, plays a key role in long-term reliability and performance of bioimplants. Metallic biomaterials have evolved largely in terms of their bulk and surface properties including nano-structuring with nanomaterials to meet the requirements of new generation orthopedic bioimplants. In this review, we have discussed metals and metal alloys commonly used for manufacturing different orthopedic bioimplants and the biotic as well as abiotic factors affecting the failure and degradation of those bioimplants. The review also highlights the currently available nanomaterial-based surface modification technologies to augment the function and performance of these metallic bioimplants in a clinical setting.

scholarly journals Preparation of cellulose nanofibers coated with poly(vinyl alcohol) crystals and their application in composite films

RSC Advances ◽  
2017 ◽  
Vol 7 (32) ◽  
pp. 19828-19832 ◽  
Author(s):  
Tetsuya Uchida ◽  
Fumiaki Iwaguro ◽  
Risa Yanai ◽  
Haruka Dodo
Keyword(s):  
Surface Properties ◽  
Vinyl Alcohol ◽  
Cellulose Nanofibers ◽  
Composite Films ◽  
Poly Vinyl Alcohol

A preparation of CeNFs coated with PVA crystals was used to change the surface properties of the CeNFs in a way that would inhibit the aggregation of CeNFs, leading to the improvement of the dispersibility of CeNFs in composites.

scholarly journals HA Coating on Ti6Al7Nb Alloy Using an Electrophoretic Deposition Method and Surface Properties Examination of the Resulting Coatings

Coatings ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 402 ◽  
Author(s):  
İbrahim Aydın ◽  
Ali İhsan Bahçepınar ◽  
Mustafa Kırman ◽  
Mustafa Ali Çipiloğlu
Keyword(s):  
Surface Properties ◽  
Electrophoretic Deposition ◽  
Scratch Test ◽  
Deposition Method ◽  
Ha Coating ◽  
Elemental Analyses ◽  
New Generation ◽  
Hardness Values ◽  
Xrd Method ◽  
The Ideal

Ti and its alloys, which are commonly used in biomedical applications, are often preferred due to their proximity to the mechanical properties of bone. In order to increase the biocompatibility and bioactivities of these materials, biomaterials based on ceramic are used in coating operations. In this study, by using an electrophoretic deposition method, instead of on the Ti6Al4V alloy which is commonly used in the literature, a hydroxyapatite (HA) coating operation was applied on the surface of the Ti6Al7Nb alloy, and the surface properties of the coatings were examined. Ti6Al7Nb is a new-generation implant on which there have not been many studies. The voltage values which were used in the coating operation were 50, 100, 150 and 200 V, and the time parameter was stabilized at 1 min. In our method, when preparing the solution, HA, ethanol, and polyvinyl alcohol (PVA) were used. At the end of the study, by using an electron microscope (SEM) the microstructures of the coatings were examined; elemental analyses (EDS) of the coating surfaces were performed; and by using an X-radiation diffraction (XRD) method, the phases which the coatings contained and the concentration of these phases were determined, and the coating thickness, roughness, and hardness values were also determined. Also, by conducting a Scratch test, the strength of the surface combination was examined. At the end of the study, in each parameter, a successful HA coating was seen. By comparing parameters with each other, the ideal voltage value in this coating was determined. It was determined that the most suitable coating was obtained at 100 V voltage and 1 min deposition time.

Spray-dried bacterial cellulose nanofibers: A new generation of pharmaceutical excipient intended for intestinal drug delivery

2020 ◽  
Vol 249 ◽  
pp. 116838 ◽  
Author(s):  
Andréia Bagliotti Meneguin ◽  
Hernane da Silva Barud ◽  
Rafael Miguel Sábio ◽  
Paula Zanin de Sousa ◽  
Karyn Fernanda Manieri ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Bacterial Cellulose ◽  
Cellulose Nanofibers ◽  
Pharmaceutical Excipient ◽  
New Generation ◽  
Spray Dried

Biological and Surface Properties of C-Type Virus Particles Produced by Novikoff Ascites Hepatoma Cells

1977 ◽  
Vol 35 ◽  
pp. 388-389
Author(s):  
D.C. Hixson ◽  
J.C. Chan ◽  
J.M. Bowen ◽  
E.F. Walborg
Keyword(s):  
Surface Properties ◽  
Ricinus Communis ◽  
Rat Kidney ◽  
Leukemia Virus ◽  
Viral Envelope ◽  
Virus Particles ◽  
Chemically Induced ◽  
Sarcoma Virus ◽  
Hepatocarcinoma Cells ◽  
Type C

Several years ago Karasaki (1) reported the production of type C virus particles by Novikoff ascites hepatocarcinoma cells. More recently, Weinstein (2) has reported the presence of type C virus particles in cell cultures derived from transplantable and primary hepatocellular carcinomas. To date, the biological function of these virus and their significance in chemically induced hepatocarcinogenesis are unknown. The present studies were initiated to determine a possible role for type C virus particles in chemically induced hepatocarcinogenesis. This communication describes results of studies on the biological and surface properties of type C virus associated with Novikoff hepatocarcinoma cells.Ecotropic and xenotropic murine leukemia virus (MuLV) activity in ascitic fluid of Novikoff tumor-bearing rats was assayed in murine sarcoma virus transformed S+L- mouse cells and S+L- mink cells, respectively. The presence of sarcoma virus activity was assayed in non-virus-producing normal rat kidney (NRK) cells. Ferritin conjugates of concanavalin A (Fer-Con wheat germ agglutinin (Fer-WGA), and Ricinus communis agglutinins I and II (Fer-RCAI and Fer-RCAII) were used to probe the structure and topography of saccharide determinants present on the viral envelope.

Finding the Right Problems: Some HREM Applications to Interfaces

1984 ◽  
Vol 42 ◽  
pp. 376-379
Author(s):  
D. Cherns
Keyword(s):  
Grain Boundaries ◽  
High Resolution Electron Microscopy ◽  
Boundary Structure ◽  
Atomic Structures ◽  
Grain Boundary Structure ◽  
Resolution Electron ◽  
Point To Point ◽  
The Right ◽  
New Generation ◽  
Better Than

The use of high resolution electron microscopy (HREM) to determine the atomic structure of grain boundaries and interfaces is a topic of great current interest. Grain boundary structure has been considered for many years as central to an understanding of the mechanical and transport properties of materials. Some more recent attention has focussed on the atomic structures of metalsemiconductor interfaces which are believed to control electrical properties of contacts. The atomic structures of interfaces in semiconductor or metal multilayers is an area of growing interest for understanding the unusual electrical or mechanical properties which these new materials possess. However, although the point-to-point resolutions of currently available HREMs, ∼2-3Å, appear sufficient to solve many of these problems, few atomic models of grain boundaries and interfaces have been derived. Moreover, with a new generation of 300-400kV instruments promising resolutions in the 1.6-2.0 Å range, and resolutions better than 1.5Å expected from specialist instruments, it is an appropriate time to consider the usefulness of HREM for interface studies.

Total etch dentin bonding systems: scanning electron microscopy of the resin-dentin hybrid layer

1992 ◽  
Vol 50 (2) ◽  
pp. 1092-1093
Author(s):  
Jorge Perdigao
Keyword(s):  
Composite Resin ◽  
Mechanical Interlocking ◽  
Hybrid Layer ◽  
Agent Based ◽  
Dentin Bonding ◽  
Acid Agent ◽  
Bond Strengths ◽  
Main Component ◽  
Bonding Systems ◽  
New Generation

In 1955, Buonocore introduced the etching of enamel with phosphoric acid. Bonding to enamel was created by mechanical interlocking of resin tags with enamel prisms. Enamel is an inert tissue whose main component is hydroxyapatite (98% by weight). Conversely, dentin is a wet living tissue crossed by tubules containing cellular extensions of the dental pulp. Dentin consists of 18% of organic material, primarily collagen. Several generations of dentin bonding systems (DBS) have been studied in the last 20 years. The dentin bond strengths associated with these DBS have been constantly lower than the enamel bond strengths. Recently, a new generation of DBS has been described. They are applied in three steps: an acid agent on enamel and dentin (total etch technique), two mixed primers and a bonding agent based on a methacrylate resin. They are supposed to bond composite resin to wet dentin through dentin organic component, forming a peculiar blended structure that is part tooth and part resin: the hybrid layer.

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