نتایج جستجو برای: nano cellulose

تعداد نتایج: 80083  

2013
Karim Missoum Mohamed Naceur Belgacem Julien Bras

Interest in nanofibrillated cellulose (NFC) has increased notably over recent decades. This bio-based nanomaterial has been used essentially in bionanocomposites or in paper thanks to its high mechanical reinforcement ability or barrier property respectively. Its nano-scale dimensions and its capacity to form a strong entangled nanoporous network have encouraged the emergence of new high-value ...

2013
H. S. Barud S. J. L. Ribeiro R. Ligabue Sandra Einloft

Optically transparent membranes from bacterial cellulose (BC)/polycaprolactone (PCL) have been prepared by impregnation of PCL acetone solution into dried BC membranes. UV-Vis measurements showed an increase on transparency in BC/PCL membrane when compared with pristine BC. The good transparency of the BC/PCL can be related to the presence of BC nanofibers associated with deposit of PCL nano-si...

2017
Kirsi Immonen Panu Lahtinen Jaakko Pere

Thermoplastic composite materials containing wood fibers are gaining increasing interest in the manufacturing industry. One approach is to use nano- or micro-size cellulosic fibrils as additives and to improve the mechanical properties obtainable with only small fibril loadings by exploiting the high aspect ratio and surface area of nanocellulose. In this study, we used four different wood cell...

2011
Ilari Filpponen Hasan Sadeghifar Dimitris S Argyropoulos

In this communication a method for the creation of fluorescent cellulose nanoparticles using click chemistry and subsequent photodimerization of the installed side‐ chains is demonstrated. In the first step, the primary hydroxyl groups on the surface of the CNCs were converted to carboxylic acids by using TEMPO‐mediated hypohalite oxidation. The alkyne groups, essent...

2013
Ali Nazari Majid Montazer Mohammad Bameni Moghadam Mohammad Esmail Yazdanshenas

The application of Butane tetra carboxylic acid/nano titanium dioxide [(BTCA)/Nano TiO2 (NTO)] on cotton fabric has been used to cross-linked cellulose, and yield higher NTO absorption and enhanced selfcleaning properties. In this research, the synergistic effect of BTCA and NTO on antibacterial properties of the cotton fabric was investigated. The NTO particles were stabilized on the cotton su...

Journal: :Applied spectroscopy 2012
Umesh P Agarwal Ronald Sabo Richard S Reiner Craig M Clemons Alan W Rudie

Raman spectroscopy was used to analyze cellulose nanocrystal (CNC) -polypropylene (PP) composites and to investigate the spatial distribution of CNCs in extruded composite filaments. Three composites were made from two forms of nanocellulose (CNCs from wood pulp and the nano-scale fraction of microcrystalline cellulose) and two of the three composites investigated used maleated PP as a couplin...

Journal: :Materials 2018
Jana S Segmehl Vanessa Studer Tobias Keplinger Ingo Burgert

Functional materials of high porosity and hierarchical structure, based on renewable building blocks, are highly demanded for material applications. In this regard, substantial progress has been made by functionalizing micro- and nano-sized cellulose followed by its reassembly via bottom-up approaches. However, bottom-up assembly processes are still limited in terms of upscaling and the utiliza...

Journal: :Journal of physics 2021

Nanocellulose is generally prepared from natural cellulose fermented by higher plants, seaweeds and microorganisms using nano-chemical processes such as acid hydrolysis, mechanical treatment, oxidation enzymatic degradation. This article starts with the definition classification of nanocellulose, focuses on preparation process method nanocellulose.

ژورنال: مواد پرانرژی 2017

Ammonium nitrate (AN) is widely used in fertilizers, civilian explosives and military explosives. Due to crystalline phase transitions and density changes of AN in the ambient conditions, its usage as oxidizer in solid propellants has some limitations as compared to ammonium perchlorate (AP). Several methods have been introduced to overcome these problems. In the present paper, the phase transi...

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