Results 281 to 290 of about 780,065 (345)

Cellulose nanocrystal-coated TEMPO-oxidized cellulose nanofiber films for high performance all-cellulose nanocomposites.

Journal of Hazardous Materials, 2020
High performance biopolymer films are of great interest as effective alternatives to non-biodegradable and petroleum-based polymer films. However, most natural biopolymer films possess weak mechanical and poor gas barrier properties, limiting their ...
Goomin Kwon, Kangyun Lee, Dabum Kim, Youngho Jeon, Ung-Jin Kim, Jungmok You   +5 more
semanticscholar   +1 more source

The Oxidative Pretreatments of Cellulose for Cellulosic Superabsorbents

2023
Cellulosic superabsorbents (SAP) are produced by using cellulose and cellulose derivative blends with different bindingmethods, generally. But cellulose in SAP leads decrease in water absorption and water bonding ability because of nonreactive character ofcellulose based on its chemical structure. The oxidative pretreatments of cellulose were attempted
Kırcı, Hüseyin, Çelik, Asena Damla, Gümüşkaya, Esat, Erişir, Emir, Belirlenecek   +4 more
openaire   +1 more source

TEMPO-oxidized cellulose fibers from wheat straw: Effect of ultrasonic pretreatment and concentration on structure and rheological properties of suspensions.

Carbohydrate Polymers, 2020
Cellulose and TEMPO-oxidized cellulose fibers (TOCF) from the wheat straw were prepared with ultrasonic and chemical treatments to investigate structure and functionalities.
Ruijing Qu, Mengyan Tang, Yong Wang, Dong Li, Lijun Wang   +4 more
semanticscholar   +1 more source

Preparation and properties of carboxymethyl chitosan/oxidized hydroxyethyl cellulose hydrogel.

International Journal of Biological Macromolecules, 2020
Hydrogel wound dressing is a type of hydrophilic polymer, which has been widely studied and applied in biomedical field. In this study, a simple and non-toxic method was developed to prepare a new type of composite hydrogel, which was formed through the ...
Pengjie Lin, Liangling Liu, Guanghua He, Tian Zhang, Ming Yang, Jinzhong Cai, Lihong Fan, Shengxiang Tao   +7 more
semanticscholar   +1 more source

Oxidation Products of Cellulose. Salts of Oxidation Products of Cellulose

1995
The first spectra of a number of oxidized celluloses were obtained by Rowen, Hunt, and Plyler [164]. They used films of regenerated cellulose, oxidized by nitrogen dioxide or periodic acid. These authors erroneously attributed bands at 1640 and 1280 cm−1, in the spectrum of cellulose oxidized by nitrogen dioxide, to the carboxyl group.
openaire   +1 more source

Irradiation of Cellulosic Pulps: Understanding Its Impact on Cellulose Oxidation

Biomacromolecules, 2012
Different pulp samples were irradiated by three energy sources: plasma, electron beaming, and γ radiation. The effect of increased exposure to irradiation was studied by multidetector gel permeation chromatography with fluorescence labeling of carbonyl groups to quantify changes of the cellulose.
Ute, Henniges, Satoko, Okubayashi, Thomas, Rosenau, Antje, Potthast   +3 more
openaire   +2 more sources

Cellulose Nanofibers Prepared by TEMPO-Mediated Oxidation of Native Cellulose

Biomacromolecules, 2007
Never-dried and once-dried hardwood celluloses were oxidized by a 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO)-mediated system, and highly crystalline and individualized cellulose nanofibers, dispersed in water, were prepared by mechanical treatment of the oxidized cellulose/water slurries.
Saito, T., Kimura, S., Nishiyama, Y., Isogai, A.   +3 more
openaire   +2 more sources

Grafted TEMPO-oxidized cellulose nanofiber embedded with modified magnetite for effective adsorption of lead ions.

International Journal of Biological Macromolecules, 2020
According to the World Health Organization, nearly a billion people do not have incoming to pure drinking water and much of that water is contaminated with high levels of heavy elements.
Ragab Abou-zeid, Kholod H. Kamal, M. El-Aziz, S. Morsi, S. Kamel   +4 more
semanticscholar   +1 more source

Adsorption of cellulose derivatives on inorganic oxides

Colloids and Surfaces A: Physicochemical and Engineering Aspects, 1998
Adsorption of hydroxyethyl cellulose (HEC) and quaternary ammonium substituted HEC (QNHEC) on silica and titanium dioxide has been investigated as a function of pH and electrolyte (NaCl) concentration. Adsorbed amounts have been determined by means of reflectometry. Adsorption of HEC on SiO2 is constant up to pH=5. At higher pH the adsorption decreases,
Hoogendam, C.W., Derks, I., de Keizer, A., Cohen Stuart, M.A., Bijsterbosch, B.H.   +4 more
openaire   +1 more source

Mechanism of the oxidation of cellulose with nitrogen oxides

Bulletin of the Academy of Sciences of the USSR Division of Chemical Science, 1959
1. Enhanced formation of nitric esters in the oxidation of cellulose with nitrogen oxides occurs when N2O3 is absent from the oxidizing mixture. 2. A maximum rate of oxidation of cellulose by N2O4 is attained at a definite content of NO in the mixture of oxides, and under the conditions applying in this investigation this NO content was ...
E. D. Kaverzneva, A. S. Salova
openaire   +1 more source