Results 231 to 240 of about 3,361,719 (297)

Sucrose tricarboxylate by sonocatalysed TEMPO-mediated oxidation

Carbohydrate Research, 2000
Oxidation of sucrose by the NaOCl/TEMPO system provided sucrose tricarboxylate without the addition of sodium bromide as co-catalyst when high-frequency (500 kHz) ultrasound was applied, in contrast to very limited conversion without sonication. In the presence of sodium bromide, sonication also caused acceleration of the oxidation.
S, Lemoine, C, Thomazeau, D, Joannard, S, Trombotto, G, Descotes, A, Bouchu, Y, Queneau   +6 more
openaire   +2 more sources

Ion conductivity through TEMPO-mediated oxidated and periodate oxidated cellulose membranes

Carbohydrate Polymers, 2020
Cellulose in different forms is increasingly used due to sustainability aspects. Even though cellulose itself is an isolating material, it might affect ion transport in electronic applications. This effect is important to understand for instance in the design of cellulose-based supercapacitors.
C, Dahlström, V, López Durán, S T, Keene, A, Salleo, M, Norgren, L, Wågberg   +5 more
openaire   +2 more sources

Thermal stabilization of TEMPO-oxidized cellulose

Polymer Degradation and Stability, 2010
Abstract A partially C6-carboxylated cellulose with carboxylate content of 1.68 mmol/g was prepared by 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO)-mediated oxidation of a softwood bleached kraft pulp. Thermogravimetric analyses of the TEMPO-oxidized cellulose (TOC) and its related materials were studied to improve thermal stability of the ...
Hayaka Fukuzumi, Tsuguyuki Saito, Yusuke Okita, Akira Isogai   +3 more
openaire   +1 more source

TEMPO catalyzed oxidative dehydrogenation of hydrazobenzenes to azobenzenes

Organic & Biomolecular Chemistry, 2020
A metal-free direct oxidative dehydrogenation approach for the synthesis of azobenzenes from hydrazobenzenes has been developed by using TEMPO as an organocatalyst for the first time.
Haiping Lv, Ronibala Devi Laishram, Yong Yang, Jiayan Li, Dandan Xu, Yong Zhan, Yang Luo, Zhimin Su, Sagar More, Baomin Fan   +9 more
openaire   +2 more sources

Increasing the Possibilities of TEMPO‐Mediated Oxidation in the Production of Cellulose Nanofibers by Reducing the Reaction Time and Reusing the Reaction Medium

Advanced Sustainable Systems, 2021
2,2,6,6‐Tetramethylpiperidine‐1‐oxyl (TEMPO)‐mediated oxidation of cellulose is the most effective pretreatment to obtain highly fibrillated cellulose nanofibers (CNFs).
J. Sánchez-Salvador, Cristina Campano, C. Negro, M. Monte, Á. Blanco   +4 more
semanticscholar   +1 more source

Solvent‐Promoted Oxidation of Aromatic Alcohols/Aldehydes to Carboxylic Acids by a Laccase‐TEMPO System: Efficient Access to 2,5‐Furandicarboxylic Acid and 5‐Methyl‐2‐Pyrazinecarboxylic Acid

Advanced Sustainable Systems, 2021
Laccase coupled with 2,2,6,6‐tetramethylpiperidinyl‐1‐oxy (TEMPO) is a well‐known catalytic system for the oxidation of alcohols to the carbonyl compounds.
Ai-Di Cheng, Min-hua Zong, G. Lu, Ning Li   +3 more
semanticscholar   +1 more source

Cellulose nanofibres by sonocatalysed-TEMPO-oxidation

Cellulose, 2011
The purpose of this work was to study the influence of acoustic cavitation on the oxidation of a mill bleached machine dried hardwood Kraft pulp. The oxidation of the pulp was carried out using 4-acetamido-TEMPO coupled with NaOCl/NaBr as co-oxidizer.
Aurélie Rattaz, Shree Prakash Mishra, Bruno Chabot, Claude Daneault   +3 more
openaire   +1 more source

TEMPO-Oxidized Bacterial Cellulose Nanofibers/Graphene Oxide Fibers for Osmotic Energy Conversion

ACS Applied Materials & Interfaces, 2021
The large osmotic energy between river water and seawater is an inexhaustible blue energy source; however, the complicated manufacturing methods used for ion-exchange devices hinder the development of reverse electrodialysis (RED). Here, we use a wet-spinning method to continuously spin meter-scale 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-oxidized ...
Nan Sheng, Shiyan Chen, Minghao Zhang, Zhuotong Wu, Qianqian Liang, Peng Ji, Huaping Wang   +6 more
openaire   +2 more sources

Facile Single-step Preparation of Cellulose Nanofibers by TEMPO-mediated Oxidation and Their Nanocomposites

Journal of Natural Fibers, 2021
Water hyacinth (Eichhornia crassipes) with a lignin concentration of 4.15% was directly oxidized by the 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-mediated oxidation without any pre-treatments (alkaline and bleaching).
S. Tanpichai, E. Wimolmala
semanticscholar   +1 more source

Kinetics of laccase-catalysed TEMPO oxidation

Journal of Molecular Catalysis B: Enzymatic, 2005
Abstract The oxidation of TEMPO (2,2,6,6-tetramethyl-piperidine-1-oxyl radical) has been studied in the presence of recombinant laccases (benzenediol:oxygen oxidoreductase, EC 1.10.3.2) from Polyporus pinsitus (rPpL), Myceliophthora thermophila (rMtL), Coprinus cinereus (rCcL) and Rhizoctonia solani (rRsL) in buffer solution pH 4.5–7.3 and at 25 °C ...
J. Kulys, R. Vidziunaite
openaire   +1 more source