Acceder

Bibliografías temáticas / Derivati cellulosa / Artículos de revistas

Siga este enlace para ver otros tipos de publicaciones sobre el tema: Derivati cellulosa.

Artículos de revistas sobre el tema "Derivati cellulosa"

Autor: Grafiati

Publicado: 10 de marzo de 2023

Crea una cita precisa en los estilos APA, MLA, Chicago, Harvard y otros

Elija tipo de fuente:

Consulte los 50 mejores artículos de revistas para su investigación sobre el tema "Derivati cellulosa".

Junto a cada fuente en la lista de referencias hay un botón "Agregar a la bibliografía". Pulsa este botón, y generaremos automáticamente la referencia bibliográfica para la obra elegida en el estilo de cita que necesites: APA, MLA, Harvard, Vancouver, Chicago, etc.

También puede descargar el texto completo de la publicación académica en formato pdf y leer en línea su resumen siempre que esté disponible en los metadatos.

Explore artículos de revistas sobre una amplia variedad de disciplinas y organice su bibliografía correctamente.

1

Demirdogen, Ruken Esra, Tuncay Yeşilkaynak, Tetyana Tishakova y Fatih Mehmet Emen. "Antibacterial Cellulose Acetate Microfibers Containing Pyridine Derivative Complexes". Chemistry & Chemical Technology 15, n.º 2 (15 de mayo de 2021): 217–25. http://dx.doi.org/10.23939/chcht15.02.217.

Texto completo

Resumen

Pyridine (L1) and 2,4-dimethylpyridine (L2) halide complexes of the type of [ML2X2] were prepared and characterized via FT-IR and 1H NMR. The CA microfibers containing complexes were electrospun and investigated via FT-IR. The morphologies of the microfibers were investigated via FE-SEM. Antibacterial activities of the complexes and the fibers were investigated.

Los estilos APA, Harvard, Vancouver, ISO, etc.

2

Kawamura, Kaito, Takatsugu Abera y Hiroshi Nonaka. "Extrusion Molding of Cellulosic Fibers Using Cellulose Derivative". JAPAN TAPPI JOURNAL 72, n.º 3 (2018): 321–27. http://dx.doi.org/10.2524/jtappij.72.321.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

3

Shaikh, Hamid M., Arfat Anis, Anesh Manjaly Poulose, Saeed M. Al-Zahrani, Niyaz Ahamad Madhar, Abdullah Alhamidi, Saleh Husam Aldeligan y Faisal S. Alsubaie. "Synthesis and Characterization of Cellulose Triacetate Obtained from Date Palm (Phoenix dactylifera L.) Trunk Mesh-Derived Cellulose". Molecules 27, n.º 4 (21 de febrero de 2022): 1434. http://dx.doi.org/10.3390/molecules27041434.

Texto completo

Resumen

Cellulosic polysaccharides have increasingly been recognized as a viable substitute for the depleting petro-based feedstock due to numerous modification options for obtaining a plethora of bio-based materials. In this study, cellulose triacetate was synthesized from pure cellulose obtained from the waste lignocellulosic part of date palm (Phoenix dactylifera L.). To achieve a degree of substitution (DS) of the hydroxyl group of 2.9, a heterogeneous acetylation reaction was carried out with acetic anhydride as an acetyl donor. The obtained cellulose ester was compared with a commercially available derivative and characterized using various analytical methods. This cellulose triacetate contains approximately 43.9% acetyl and has a molecular weight of 205,102 g·mol−1. The maximum thermal decomposition temperature of acetate was found to be 380 °C, similar to that of a reference sample. Thus, the synthesized ester derivate can be suitable for fabricating biodegradable and “all cellulose” biocomposite systems.

Los estilos APA, Harvard, Vancouver, ISO, etc.

4

Correia, Daniela M., Erlantz Lizundia, Rafaela M. Meira, Mikel Rincón-Iglesias y Senentxu Lanceros-Méndez. "Cellulose Nanocrystal and Water-Soluble Cellulose Derivative Based Electromechanical Bending Actuators". Materials 13, n.º 10 (15 de mayo de 2020): 2294. http://dx.doi.org/10.3390/ma13102294.

Texto completo

Resumen

This study reports a versatile method for the development of cellulose nanocrystals (CNCs) and water-soluble cellulose derivatives (methyl cellulose (MC), hydroxypropyl cellulose (HPC), and sodium carboxymethyl cellulose (NaCMC)) films comprising the ionic liquid (IL) 2-hydroxy-ethyl-trimethylammonium dihydrogen phosphate ([Ch][DHP]) for actuator fabrication. The influence of the IL content on the morphology and physico–chemical properties of free-standing composite films was evaluated. Independently of the cellulose derivative, the ductility of the films increases upon [Ch][DHP] incorporation to yield elongation at break values of nearly 15%. An increase on the electrical conductivity as a result of the IL incorporation into cellulosic matrices is found. The actuator performance of composites was evaluated, NaCMC/[Ch][DHP] showing the maximum displacement along the x-axis of 9 mm at 8 Vpp. Based on the obtained high electromechanical actuation performance, together with their simple processability and renewable nature, the materials fabricated here represent a step forward in the development of sustainable soft actuators of high practical relevance.

Los estilos APA, Harvard, Vancouver, ISO, etc.

5

Nechifor, Aurelia Cristina, Andreia Pîrțac, Paul Constantin Albu, Alexandra Raluca Grosu, Florina Dumitru, Ioana Alina Dimulescu (Nica), Ovidiu Oprea, Dumitru Pașcu, Gheorghe Nechifor y Simona Gabriela Bungău. "Recuperative Amino Acids Separation through Cellulose Derivative Membranes with Microporous Polypropylene Fiber Matrix". Membranes 11, n.º 6 (5 de junio de 2021): 429. http://dx.doi.org/10.3390/membranes11060429.

Texto completo

Resumen

The separation, concentration and transport of the amino acids through membranes have been continuously developed due to the multitude of interest amino acids of interest and the sources from which they must be recovered. At the same time, the types of membranes used in the sepa-ration of the amino acids are the most diverse: liquids, ion exchangers, inorganic, polymeric or composites. This paper addresses the recuperative separation of three amino acids (alanine, phe-nylalanine, and methionine) using membranes from cellulosic derivatives in polypropylene ma-trix. The microfiltration membranes (polypropylene hollow fibers) were impregnated with solu-tions of some cellulosic derivatives: cellulose acetate, 2-hydroxyethyl-cellulose, methyl 2-hydroxyethyl-celluloseand sodium carboxymethyl-cellulose. The obtained membranes were characterized in terms of the separation performance of the amino acids considered (retention, flux, and selectivity) and from a morphological and structural point of view: scanning electron microscopy (SEM), high resolution SEM (HR-SEM), Fourier transform infrared spectroscopy (FT-IR), energy dispersive spectroscopy (EDS) and thermal gravimetric analyzer (TGA). The re-sults obtained show that phenylalanine has the highest fluxes through all four types of mem-branes, followed by methionine and alanine. Of the four kinds of membrane, the most suitable for recuperative separation of the considered amino acids are those based on cellulose acetate and methyl 2-hydroxyethyl-cellulose.

Los estilos APA, Harvard, Vancouver, ISO, etc.

6

Soto-Salcido, L. A., I. Anugwom, L. Ballinas-Casarrubias, M. Mänttäri y M. Kallioinen. "NADES-based fractionation of biomass to produce raw material for the preparation of cellulose acetates". Cellulose 27, n.º 12 (29 de mayo de 2020): 6831–48. http://dx.doi.org/10.1007/s10570-020-03251-1.

Texto completo

Resumen

Abstract Waste biomass (agave bagasse) and native birch wood were used as raw materials for a novel fractionation and derivation process to produce cellulose acetates (CAs). During the first stage of the fractionation process, a significant amount of hemicelluloses and lignin were dissolved from the biomass using a natural deep eutectic solvent (NADES) that consisted of a mixture of choline chloride and lactic acid with the molar ratio of 1:9. Then, the residual solid material was delignified by bleaching it with a mixture of acetic acid and sodium chlorite. The fractionation process generated differently purified pulps (celluloses) which were converted to CAs. The crystallinity index, polymerization degree, chemical composition, and thermal properties of the differently purified pulps and CAs were analyzed to evaluate the efficacy of the acetylation process and to characterize the CAs. The chemical derivation of the differently purified cellulose samples generated CAs with different degrees of substitution (DSs). The more purified the cellulose sample was, the higher its DS was. Moreover, some differences were observed between the acetylation efficiencies of birch and agave bagasse. Typically, cellulose purified from birch by treating it with NADES followed by bleaching was acetylated more completely (DS = 2.94) than that derived from agave bagasse (DS = 2.45). These results revealed that using green solvents, such as NADES, to treat both agave bagasse (waste biomass) and birch wood, allowed pure fractions to be obtained from biomass, and thus, biomass could be valorized into products such as CAs, which present a wide range of applications.

Los estilos APA, Harvard, Vancouver, ISO, etc.

7

Danilevicius, Almantas, Justina Dobiliene, Christoph Wutz y Jolanta Liesiene. "Phenoxyhydroxypropylhydroxyethylcellulose—new amphiphilic cellulose derivative". Cellulose 14, n.º 4 (3 de enero de 2007): 321–29. http://dx.doi.org/10.1007/s10570-006-9105-9.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

8

Zhou, Xuesong y Yong Huang. "Cellulose derivative-based cholesteric networks". Journal of Applied Polymer Science 96, n.º 5 (2005): 1648–53. http://dx.doi.org/10.1002/app.21617.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

9

Simon, Mathilde, René Fulchiron y Fabrice Gouanvé. "Water Sorption and Mechanical Properties of Cellulosic Derivative Fibers". Polymers 14, n.º 14 (12 de julio de 2022): 2836. http://dx.doi.org/10.3390/polym14142836.

Texto completo

Resumen

In this study, water vapor sorption, desorption properties and tensile mechanical properties of four cellulosic fibers, cotton (C), flax (F), viscose (V) and cellulose acetate (CA), were determined. The sorption and desorption isotherms were modeled using the Park model, which allowed an accurate fitting on the whole range of water activity. This model corresponds to a multi-sorption mode dividing in three sorption modes: Langmuir sorption, Henry’s law and water clustering. Park’s parameters were compared for the sorption and desorption isotherms for each fiber. Regardless of the fiber, differences between sorption and desorption were obtained only for the Henry sorption. The obtained sorption properties were correlated to the accessibility and the amount of sorption sites and also to the crystallinity level of the fibers. It was found that V exhibited the highest water sorption capacity due to a higher hydroxyl groups accessibility and a low amorphous fraction, followed by F, C and CA. Results from tensile tests demonstrated that F and C fibers were more rigid, more resistant and less ductile than CA and V fibers due to a difference of microstructure of the fibers. Finally, the presence of water-sorbed molecules led to a decrease in tensile modulus due to plasticization phenomenon.

Los estilos APA, Harvard, Vancouver, ISO, etc.

10

Putri, Margaretha Efa, Anis Yohana Chaerunisaa y Marline Abdassah. "Cellulose Nanocrystals Preparation as Pharmaceuticals Excipient : a Review". Indonesian Journal of Pharmaceutics 2, n.º 2 (4 de marzo de 2020): 42. http://dx.doi.org/10.24198/idjp.v2i2.26422.

Texto completo

Resumen

Cellulose nanocrystals is a cellulose derivates which has been widely researched and observed as an chemical agent. Different with cellulose that has been widely used as pharmaceutical excipient especially in solid dosage form, cellulose in nanocrystals form is not available in pharmaceutical grade. Cellulose nanocrystals have different characteristics and quality which is depend on its preparation including sourcing, isolation procedure, and hydrolysis reaction involved. This difference is very important to deeply observed its impact in pharmaceutical dosage form with different active ingredients. In addition, cellulose nanocrystals should meet FDA requirement as pharmaceutical excipient. This review describe cellulose nanocrystals preparation and its characteristics, its application to active pharmaceutical ingredients, and its properties in order to meet FDA requirement.Keywords: Cellulose, nanocrystals, pharmaceutical excipient

Los estilos APA, Harvard, Vancouver, ISO, etc.

11

Heinze, T., J. A. Camacho G�mez y G. Haucke. "Synthesis and characterization of the novel cellulose derivative dansyl cellulose". Polymer Bulletin 37, n.º 6 (diciembre de 1996): 743–49. http://dx.doi.org/10.1007/bf00295772.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

12

Ismailov, B. A., R. A. Sadykov y O. V. Kim. "Hemostatic implant based on cellulose derivates". Experimental and Clinical Gastroenterology, n.º 9 (24 de marzo de 2020): 56–61. http://dx.doi.org/10.31146/1682-8658-ecg-169-9-56-61.

Texto completo

Resumen

Aim of research: to study the comparative effectiveness of new polycompositive of hemostatic implant on in vivo model of liver parenchymal bleeding.Material and methods. Experimental studies were performed using the developed polycompositive hemostatic implant (CPM) from cellulose derivatives. Main components of implant include: natrium carboxymethylcellulose, oxidized cellulose, nanocellulose and bonded calcium ions. In vivo experiments were conducted in both sexes white 24 utbred rats weighing 196.5 ± 2.8 grams. The animals were divided into two groups: the comparative group (n = 24) with an application of polycomposite hemostatic implant and main group (n = 24) with medical gauze. The hemostatic materials were used in equal weight 30 mg. All surgical procedures on animals were performed under general inhalation anesthesia in model of liver parenchymal bleeding.Results. Thus, hemostasis was reached within 34.0 ± 2.5 seconds in the main group with CPM, in the comparative group with medical gauze — 142.2±7.7 seconds. Repeated bleeding was observed in 11 (45.8%) cases of the comparative group and in the main group — 2 (8.3%) cases. Biodegradation of the hemostatic implant and regenerative processes in the liver parenchyma were registered on the 14 day, especially in the injured area that indicates the restoration of liver tissue. In the comparative group on the 30th day, the preservation of medical gauze structure was revealed without degradation signs.Findings. According to our research data, a polycompositive hemostatic implant adheres tightly to the liver tissue, stops bleeding without its recurrence. In histological studies conducted in the dynamics of wound healing of the liver it was found that the implant does not cause a severe inflammatory reaction and biodegradation occurs after 14 days.

Los estilos APA, Harvard, Vancouver, ISO, etc.

13

Almeida, P. L., G. Lavareda, C. Nunes De Carvalho, A. Amaral, M. H. Godinho, M. T. Cidade y J. L. Figueirinhas. "Flexible cellulose derivative PDLC type cells". Liquid Crystals 29, n.º 3 (1 de marzo de 2002): 475–77. http://dx.doi.org/10.1080/02678290110113487.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

14

Pandey, S. N. "Derivative infrared spectroscopy of cotton cellulose". Journal of Applied Polymer Science 34, n.º 3 (20 de agosto de 1987): 1199–208. http://dx.doi.org/10.1002/app.1987.070340327.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

15

YOO, BYONG KWON, TOD STEWART, JEAN GUARD-BOULDIN, MICHAEL MUSGROVE, RICHARD GAST y JINRU CHEN. "Selection and Characterization of Cellulose-Deficient Derivates of Shiga Toxin–Producing Escherichia coli". Journal of Food Protection 73, n.º 6 (1 de junio de 2010): 1038–46. http://dx.doi.org/10.4315/0362-028x-73.6.1038.

Texto completo

Resumen

Shiga toxin–producing Escherichia coli (STEC) is known to have several defense mechanisms, one of which is the production of extracellular substances including cellulose. The goal of this study was to prepare pairs of STEC cultures for use in future studies designed to address the role of cellulose in protecting the cells of STEC for survival under adverse environmental conditions. Cells of STEC deficient in cellulose production were separated from cellulose-proficient wild-type cells. The identities of the two types of cells were confirmed using serotyping and pulsed-field gel electrophoresis (PFGE). Selected growth characteristics of the two types of cells were determined using three phenotype microarray plates, PM9, PM10, and PM11. The cellulose-deficient and cellulose-proficient cells in each STEC pair shared the same serotype and PFGE profile. The deficiency in cellulose production did not significantly (P > 0.05) affect the growth characteristics of STEC cells under 191 of the 210 tested growth conditions. Significant differences in growth between the two types of cells were observed only in the presence of two antibiotics, a short chain fatty acid, and high concentrations of osmolytes, as well as under extreme acidic and alkaline pH. These results suggest that deficiency in cellulose production did not alter the serological property, PFGE profile, and growth characteristics of selected STEC strains under optimal growth conditions. The STEC strains and their cellulose-deficient derivates could be useful for studying the role of cellulose in protecting the cells of STEC for survival under adverse environmental conditions.

Los estilos APA, Harvard, Vancouver, ISO, etc.

16

Mohan, Tamilselvan, Cíntia Salomão Pinto Zarth, Aleš Doliška, Rupert Kargl, Thomas Grießer, Stefan Spirk, Thomas Heinze y Karin Stana-Kleinschek. "Interactions of a cationic cellulose derivative with an ultrathin cellulose support". Carbohydrate Polymers 92, n.º 2 (febrero de 2013): 1046–53. http://dx.doi.org/10.1016/j.carbpol.2012.10.026.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

17

Gjurgjaj, Lorenci, Enida Nushi, Altin Mele, Ardita Mele, Dorina Mele y Igli Qoshja. "Polystyrene modification by cellulose derivative and organoclay". Acta Crystallographica Section A Foundations and Advances 77, a2 (14 de agosto de 2021): C731. http://dx.doi.org/10.1107/s0108767321089650.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

18

González, Francisco, Pilar Tiemblo y Mario Hoyos. "In-Situ Approaches for the Preparation of Polythiophene-Derivative Cellulose Composites with High Flexibility and Conductivity". Applied Sciences 9, n.º 16 (15 de agosto de 2019): 3371. http://dx.doi.org/10.3390/app9163371.

Texto completo

Resumen

Composite materials of conjugated polymers/cellulose were fabricated by incorporating different polythiophene-derivative polymers: Poly(3,4-ethylenedioxythiophene) (PEDOT) and an alkylated derivative of poly(3,4-propylenedioxythiophene) (PProDOT). These conjugated polythiophenes were deposited by casting or spray coating methodologies onto three different cellulose substrates: Conventional filters papers as cellulose acetate, cellulose grade 40 Whatman® and cellulose membranes prepared from cellulose microfibers. The preparation of composite materials was carried out by two methodologies: (i) by employing in-situ polymerization of 3,4-ethylenedioxithiophene (EDOT) or (ii) by depositing solutions of poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) or lab-synthetized PProDOT. Composite materials were studied in terms of electrical conductivity and surface morphology assessed by impedance spectroscopy, surface conductivity, SEM, and 3D optical profilometry. In-situ composite materials prepared by spray coating using iron trifluoromethane sulfonate as oxidizing agent can be handled and folded as the original cellulose membranes displaying a surface conductivity around 1 S∙cm−1. This versatile procedure to prepare conductive composite materials has the potential to be implemented in flexible electrodes for energy storage applications.

Los estilos APA, Harvard, Vancouver, ISO, etc.

19

HAMATSU, Takao, Kazuhiro HUKUDOME, Jun-ichi HIROSE y Minako ITO. "Structure and Some Characteristics of a Novel Cellulose Derivative Cellulose Nitrate Carboxymethyl Ether". Journal of the Japan Society of Colour Material 68, n.º 12 (1995): 741–51. http://dx.doi.org/10.4011/shikizai1937.68.741.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

20

Xiao, Yun Tan, Wei Lai Chin y Sharifah Bee Abd Hamid. "Facile Preparation of Highly Crystalline Nanocellulose by Using Ionic Liquid". Advanced Materials Research 1087 (febrero de 2015): 106–10. http://dx.doi.org/10.4028/www.scientific.net/amr.1087.106.

Texto completo

Resumen

In recent decades, dependence on fossil fuels resources has shifted into derivation of cellulose based materials to replace the non-renewable resources. Lignocellulosic biomass is the most abundant feedstock on earth and is one of the promising renewable and sustainable resources. In the present study, simple preparation of nanocellulose particles by using ionic liquid (1-butyl-3-methylimidazolium hydrogen sulfate) has been introduced by investigating the influence of reaction temperature (room temperature and heat treated at 90°C). The resultant samples were characterized using X-Ray Diffraction (XRD) and Fourier-Transform Infrared Spectroscopy (FTIR). Interestingly, it was found that the high crystallinity sample could be synthesized at temperature of 90°C. The reason might be attributed to ionic liquid enter into the space between cellulose chains and caused cellulose molecules progressively swelled up when heated. Consequently, amorphous regions of cellulose were dissolved by ionic liquid and crystalline parts of cellulose were leave in the cellulose structure. From the XRD data, it could be observed that sharper crystalline peak and higher crystallinity index (CrI) present within heat-treated samples which corresponded to higher crystalline structure of cellulose I. While the broader peak and lower CrI of untreated cellulose samples indicated lower crystalline structure of cellulose I. Pretreatment of cellulose with ionic liquid can provides a facile approach for the preparation of nanocellulose particles with high crystallinity.

Los estilos APA, Harvard, Vancouver, ISO, etc.

21

Lux, Cassia, Thomas Tilger, Ramsia Geisler, Olaf Soltwedel y Regine von Klitzing. "Model Surfaces for Paper Fibers Prepared from Carboxymethyl Cellulose and Polycations". Polymers 13, n.º 3 (29 de enero de 2021): 435. http://dx.doi.org/10.3390/polym13030435.

Texto completo

Resumen

For tailored functionalization of cellulose based papers, the interaction between paper fibers and functional additives must be understood. Planar cellulose surfaces represent a suitable model system for studying the binding of additives. In this work, polyelectrolyte multilayers (PEMs) are prepared by alternating dip-coating of the negatively charged cellulose derivate carboxymethyl cellulose and a polycation, either polydiallyldimethylammonium chloride (PDADMAC) or chitosan (CHI). The parameters varied during PEM formation are the concentrations (0.1–5 g/L) and pH (pH = 2–6) of the dipping solutions. Both PEM systems grow exponentially, revealing a high mobility of the polyelectrolytes (PEs). The pH-tunable charge density leads to PEMs with different surface topographies. Quartz crystal microbalance experiments with dissipation monitoring (QCM-D) reveal the pronounced viscoelastic properties of the PEMs. Ellipsometry and atomic force microscopy (AFM) measurements show that the strong and highly charged polycation PDADMAC leads to the formation of smooth PEMs. The weak polycation CHI forms cellulose model surfaces with higher film thicknesses and a tunable roughness. Both PEM systems exhibit a high water uptake when exposed to a humid environment, with the PDADMAC/carboxymethyl cellulose (CMC) PEMs resulting in a water uptake up to 60% and CHI/CMC up to 20%. The resulting PEMs are water-stable, but water swellable model surfaces with a controllable roughness and topography.

Los estilos APA, Harvard, Vancouver, ISO, etc.

22

Kurematsu, Kazuho, Satoshi Takei, Kento Mizui y Makoto Hanabata. "Development of Cellulose Derivative Mold for Imprint Lithography". Journal of Photopolymer Science and Technology 32, n.º 1 (24 de junio de 2019): 131–36. http://dx.doi.org/10.2494/photopolymer.32.131.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

23

SHIRAKI, Tomohiro, Takayuki ISHIHARA y Norio NEMOTO. "Mechanical Properties of Cellulose Derivative/Zein Blend Films." KOBUNSHI RONBUNSHU 58, n.º 11 (2001): 598–605. http://dx.doi.org/10.1295/koron.58.598.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

24

Leguey, S., A. I. Ruiz, R. Fernandez y J. Cuevas. "Resistant cellulose-derivative biopolymer templates in natural sepiolite". American Journal of Science 314, n.º 6 (1 de junio de 2014): 1041–63. http://dx.doi.org/10.2475/06.2014.03.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

25

Zhao, Guanglei, Fengli Wang, Xiongfei Lang, Beihai He, Junrong Li y Xiaofeng Li. "Facile one-pot fabrication of cellulose nanocrystals and enzymatic synthesis of its esterified derivative in mixed ionic liquids". RSC Advances 7, n.º 43 (2017): 27017–23. http://dx.doi.org/10.1039/c7ra02570j.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

26

Dong, Yan Ming, Ya Qing Zhao, Er Man Zeng, Liu Lin Yang, Qiang Ge y Xiao Lan Hu. "A Dendronized Cellulose Derivative and its Thermotropic Liquid Crystal and Lyotropic Cholesteric Liquid Crystal Behaviors". Advanced Materials Research 239-242 (mayo de 2011): 2620–23. http://dx.doi.org/10.4028/www.scientific.net/amr.239-242.2620.

Texto completo

Resumen

A novel dendronized cellulose，ethyl cellulose grafted 3,4,5-tris[4-(dodecyloxy) benzyloxy] benzoate (EC-g-DOBOB), which is comprised of ethyl cellulose (EC) backbone with mesogenic moiety DOBOB (3,4,5-tris(4-(dodecyloxy)benzyloxy)benzoic acid) dendron grafted, was designed and synthesized. The structure of EC-g-DOBOB was investigated by means of FTIR, Both thermotropic liquid crystal and lyotropic liquid crystal behaviors of EC-g-DOBOB were studied by combination of DSC, POM and XRD. At room temperature EC-g-DOBOB demonstrated hexagonal columnar mesophase (Φh), with the column diameter 5.8 nm, besides it formed lyotropic cholesteric liquid crystal in concentrated chloroform solution with a planar texture.

Los estilos APA, Harvard, Vancouver, ISO, etc.

27

Sánchez-Cid, Pablo, José Fernando Rubio-Valle, Mercedes Jiménez-Rosado, Víctor Pérez-Puyana y Alberto Romero. "Effect of Solution Properties in the Development of Cellulose Derivative Nanostructures Processed via Electrospinning". Polymers 14, n.º 4 (10 de febrero de 2022): 665. http://dx.doi.org/10.3390/polym14040665.

Texto completo

Resumen

In the last few years, electrospinning has proved to be one of the best methods for obtaining membranes of a micro and nanometric fiber size. This method mainly consists in the spinning of a polymeric or biopolymeric solution in solvents, promoted by the difference in the electric field between the needle and collector, which is finally deposited as a conjunction of randomly oriented fibers. The present work focuses on using cellulose derivatives (namely cellulose acetate and ethylcellulose), based on the revaluation of these byproducts and waste products of biorefinery, to produce nanostructured nanofiber through electrospinning with the objective of establishing a relation between the initial solutions and the nanostructures obtained. In this sense, a complete characterization of the biopolymeric solutions (physicochemical and rheological properties) and the resulting nanostructures (microstructural and thermal properties) was carried out. Therefore, solutions with different concentrations (5, 10, 15, and 20 wt%) of the two cellulose derivatives and different solvents with several proportions between them were used to establish their influence on the properties of the resulting nanostructures. The results show that the solutions with 10 wt% in acetic acid/H2O and 15 wt% in acetone/N,N-dimethylformamide of cellulose acetate and 5 wt% of ethylcellulose in acetone/N,N-dimethylformamide, exhibited the best properties, both in the solution and nanostructure state.

Los estilos APA, Harvard, Vancouver, ISO, etc.

28

Lopez, Sergio G., Luis Crovetto, Jose M. Alvarez-Pez, Eva M. Talavera y Enrique San Román. "Fluorescence enhancement of a fluorescein derivative upon adsorption on cellulose". Photochem. Photobiol. Sci. 13, n.º 9 (2014): 1311–20. http://dx.doi.org/10.1039/c4pp00150h.

Texto completo

Resumen

9-[1-(2-Methyl-4-methoxyphenyl)]-6-hydroxy-3H-xanthen-3-one (2-Me-4-OMe TG) is a fluorescein derivative dye whose adsorption on cellulose notably enhances its fluorescence and undergoes efficient energy transfer to Dabcyl.

Los estilos APA, Harvard, Vancouver, ISO, etc.

29

El Hamdaoui, Lahcen, Ahmed Talbaoui y Mohammed El Moussaouiti. "Nucleophilic Displacement Reaction on Tosyl Cellulose by L-Methionine to the Synthesis of Novel Water-Soluble Cellulose Derivative and Its Antibacterial Activity". International Journal of Polymer Science 2021 (13 de febrero de 2021): 1–9. http://dx.doi.org/10.1155/2021/6613684.

Texto completo

Resumen

A novel ampholytic cellulose derivative, cellulose-L-methionine, has been synthesized by means of an esterification reaction of microcrystalline cellulose with tosyl chloride (p-TsCl) in DMAc/LiCl (8%) at 8°C that was followed by nucleophilic displacement (SN) of the tosyl group by the L-methionine amino acid. The resulting structure of cellulose-L-methionine has been characterized by elemental analysis (CHNSO), Fourier-transform infrared spectroscopy (FTIR), proton nuclear magnetic resonance (1H-NMR), and scanning electron microscopy (SEM). The antibacterial activity of the synthesized product was screened against Gram-positive and Gram-negative microbial strains such as Staphylococcus aureus, Escherichia coli, and Pseudomonas aeruginosa, by the agar well diffusion method, and compared with commercial antibiotics such as ampicillin and chloramphenicol. It was found that antibacterial experiment revealed excellent antibacterial activity of the cellulose-methionine with respect to a minimal inhibitory concentration (MIC) reference.

Los estilos APA, Harvard, Vancouver, ISO, etc.

30

Zhang, Changde, Loren M. Price y William H. Daly. "Synthesis and Characterization of a Trifunctional Aminoamide Cellulose Derivative". Biomacromolecules 7, n.º 1 (enero de 2006): 139–45. http://dx.doi.org/10.1021/bm050465n.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

31

Barba, Anna Angela, Annalisa Dalmoro y Matteo d'Amore. "Microwave assisted drying of cellulose derivative (HPMC) granular solids". Powder Technology 237 (marzo de 2013): 581–85. http://dx.doi.org/10.1016/j.powtec.2012.12.060.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

32

Godinho, M. H., D. Filip, I. Costa, A. L. Carvalho, J. L. Figueirinhas y E. M. Terentjev. "Liquid crystalline cellulose derivative elastomer films under uniaxial strain". Cellulose 16, n.º 2 (7 de octubre de 2008): 199–205. http://dx.doi.org/10.1007/s10570-008-9258-9.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

33

Matsuoka, Takuma y Hiroshi Nonaka. "Wet Extrusion of Wood Powder Using a Cellulose Derivative". JAPAN TAPPI JOURNAL 74, n.º 5 (2020): 516–24. http://dx.doi.org/10.2524/jtappij.74.516.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

34

Navard, P. y A. E. Zachariades. "Optical properties of a shear-deformed thermotropic cellulose derivative". Journal of Polymer Science Part B: Polymer Physics 25, n.º 5 (mayo de 1987): 1089–98. http://dx.doi.org/10.1002/polb.1987.090250510.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

35

Shaikh, V. A. E., N. N. Maldar, S. V. Lonikar, C. R. Rajan y S. Ponrathnam. "Thermotropic behavior of lithocholic acid derivative linked hydroxyethyl cellulose". Journal of Applied Polymer Science 100, n.º 3 (2006): 1995–2001. http://dx.doi.org/10.1002/app.22285.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

36

SAKELLARIOU, P. "Interactions in cellulose derivative films for oral drug delivery". Progress in Polymer Science 20, n.º 5 (1995): 889–942. http://dx.doi.org/10.1016/0079-6700(95)00008-4.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

37

Carvalho, Elaine S., Rubén J. Sánchez, Maria I. B. Tavares y Álano C. Lamônica. "Characterization and Properties of Hydrophilic Cellulose Acetate Propionate Derivative". Journal of Polymers and the Environment 18, n.º 4 (15 de junio de 2010): 661–67. http://dx.doi.org/10.1007/s10924-010-0221-0.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

38

Bračič, Matej, Tamilselvan Mohan, Rupert Kargl, Thomas Grießer, Thomas Heinze y Karin Stana Kleinschek. "Protein repellent anti-coagulative mixed-charged cellulose derivative coatings". Carbohydrate Polymers 254 (febrero de 2021): 117437. http://dx.doi.org/10.1016/j.carbpol.2020.117437.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

39

Altam, Ali A., Jiali Xu, Mahmoud H. M. A. Shibraen, Kiran Rehan, Hajo Yagoub, Jian Xu y Shuguang Yang. "Cellulose derivative-lanthanide complex film by hierarchical assembly process". Carbohydrate Polymers 168 (julio de 2017): 240–46. http://dx.doi.org/10.1016/j.carbpol.2017.03.075.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

40

Ohkawa, Kousaku, Mikiko Nishibayashi, Kesavan Devarayan, Masakazu Hachisu y Jun Araki. "Synthesis of peptide–cellulose conjugate mediated by a soluble cellulose derivative having β-Ala esters". International Journal of Biological Macromolecules 53 (febrero de 2013): 150–59. http://dx.doi.org/10.1016/j.ijbiomac.2012.11.004.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

41

Lei, Ning Ning, Na Zhong, Yi Dong Shi y Xiao Rui Ling. "Researches on the Fixation Performance of Chitosan and its Derivative". Advanced Materials Research 535-537 (junio de 2012): 1547–51. http://dx.doi.org/10.4028/www.scientific.net/amr.535-537.1547.

Texto completo

Resumen

The fixing performance of chitosan hydrochloride (CSH) with different molecular weight and chitosan biguanide hydrochloride (CSGH) as a fixing agent for cotton fabric dyed with reactive dyes was discussed. The results showed that the fixing effects of CSH on reactive dyes were related to its molecular weight, and the CSH with high molecular weight (HMW) exhibited better fixing effects than that with low molecular weight (LMW). The fixing effects of CSGH on reactive dyes were superior to that of the CSH with HMW, because of the CSGH molecule with positive charges and the imino groups, which could further strengthened the interaction among the CSGH, dyes and cellulose molecules. After treated by the CSGH, the soaping, perspiration and dry rubbing fastness of the dyed fabrics could be increased 0.5 to 1 grade, while the wet rubbing fastness of ones was also improved obviously. The infrared spectrum (FTIR) of the dyed fabric treated by CSGH showed that a cross-linking was formed among CSGH, dyes and cellulose molecules.

Los estilos APA, Harvard, Vancouver, ISO, etc.

42

García Hernández, Miguel Ángel, Arturo López Marure, María Guadalupe Neira Velázquez, Jaime Alfredo Mariano Torres y Adrian Arroyo Galvan. "Microcrystalline cellulose isolation – Proposed mechanism: Enhanced coupling". BioResources 18, n.º 1 (19 de enero de 2023): 1788–802. http://dx.doi.org/10.15376/biores.18.1.1788-1802.

Texto completo

Resumen

Cellulose-derived materials are an emergent opportunity for reducing the environmental impact of polymers. Microcrystalline cellulose (MCC) has increasing relevance in many sectors, including pharmacy, food, and reinforcement of polymers, but its application is limited by the low coupling between it and nonpolar polymers and the polar behavior of cellulose derivates. There is not a well-defined model for the isolation of MCC and the factors involved in the length and width, which are elements of high influence on the reinforcement effect of MCC. This study proposes a mechanism for the size reduction of cellulose fibrils isolated through acid hydrolysis and a post-plasma surface modification (PSM) to enhance coupling of the MCC with hydrophobic polymer matrixes. MCC was characterized by FTIR, XRD, and SEM before and after the plasma surface treatment with caprolactone, a biodegradable polymer. There were no changes in the FTIR spectra; however, in XRD the sample exhibited a decrease in intensity. These results suggest that PSM did not change the structure of MCC or chemical composition. However, an increase in the peak temperature of degradation confirmed the surface modification of MCC.

Los estilos APA, Harvard, Vancouver, ISO, etc.

43

El-Sayed, Naglaa Salem, Ahmed Salama y Vincenzo Guarino. "Coupling of 3-Aminopropyl Sulfonic Acid to Cellulose Nanofibers for Efficient Removal of Cationic Dyes". Materials 15, n.º 19 (7 de octubre de 2022): 6964. http://dx.doi.org/10.3390/ma15196964.

Texto completo

Resumen

A novel anionic nanostructured cellulose derivate was prepared through the coupling of TEMPO-oxidized cellulose nanofibers with 3-aminopropyl sulfonic acid (3-APSA). 3-APSA grafting was variously investigated by FT-IR spectroscopy and transmission electron microscopy (TEM) analysis, confirming a high reaction degree. The surface morphology investigated via scanning electron microscopy (SEM) revealed a more uniform organization of the nanofibers after the 3-APSA coupling, with improvements in terms of fiber packing and pore interconnectivity. This peculiar morphology contributes to improving methylene blue (MB) adsorption and removal efficiency at different operating conditions (pH, initial time, and initial concentration). The results indicated a maximum adsorption capacity of 526 mg/g in the case of 3-APSA grafted nanofibers, over 30% more than that of non-grafted ones (370 mg/g), which confirm a relevant effect of chemical modification on the adsorbent properties of cellulose nanofibers. The adsorption kinetics and isotherms of the current adsorbents match with the pseudo-second-order kinetic and Langmuir isotherm models. This study suggests the use of chemical grafting via 3-APSA is a reliable and facile post-treatment to design bio-sustainable and reusable nanofibers to be used as high-performance adsorbent materials in water pollutant remediation.

Los estilos APA, Harvard, Vancouver, ISO, etc.

44

Michell, Anthony J. "Second-derivative F.t.-i.r. spectra of native celluloses". Carbohydrate Research 197 (marzo de 1990): 53–60. http://dx.doi.org/10.1016/0008-6215(90)84129-i.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

45

Corder, Ria D., Prajesh Adhikari, Michael C. Burroughs, Orlando J. Rojas y Saad A. Khan. "Cellulose nanocrystals for gelation and percolation-induced reinforcement of a photocurable poly(vinyl alcohol) derivative". Soft Matter 16, n.º 37 (2020): 8602–11. http://dx.doi.org/10.1039/d0sm01376e.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

46

Guerrero, Rodel, Paul W. S. Heng y Terence P. Tumolva. "Preparation of Crosslinked Alginate-Cellulose Derivative Microparticles for Protein Delivery". Key Engineering Materials 931 (9 de septiembre de 2022): 69–75. http://dx.doi.org/10.4028/p-o7266l.

Texto completo

Resumen

Microparticle protein delivery system using alginate and cellulose derivative (HPC, HEC and CMC) composite system was prepared using external gelation with vibration technology. Bovine serum albumin (BSA) as a model protein was encapsulated using these biodegradable materials. This preparation showed an increase in encapsulation efficiency in comparison to the samples where pure alginate was used as the encapsulating material. Compared with the other microparticles, the 50:50 alginate/HEC samples exhibited significant encapsulation efficiency. Consequently, its release rate in the acidic medium was comparatively substantial and higher cumulative release in the simulated intestinal fluid (SIF) medium at the end of the dissolution study was observed to be high at around 86.17%.

Los estilos APA, Harvard, Vancouver, ISO, etc.

47

Xi, Jinxu, Daqian Ding, Yi Shao, Xiaohui Liu, Guanzhong Lu y Yanqin Wang. "Production of Ethylene Glycol and Its Monoether Derivative from Cellulose". ACS Sustainable Chemistry & Engineering 2, n.º 10 (2 de septiembre de 2014): 2355–62. http://dx.doi.org/10.1021/sc500380c.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

48

Ryo, Yoshitaka, Yasuhiro Nakai y Masami Kawaguchi. "Viscoelastic measurements of silica suspensions in aqueous cellulose derivative solutions". Langmuir 8, n.º 10 (octubre de 1992): 2413–16. http://dx.doi.org/10.1021/la00046a012.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

49

Ikai, Tomoyuki, Reiko Muraki, Chiyo Yamamoto, Masami Kamigaito y Yoshio Okamoto. "Cellulose Derivative-based Beads as Chiral Stationary Phase for HPLC". Chemistry Letters 33, n.º 9 (septiembre de 2004): 1188–89. http://dx.doi.org/10.1246/cl.2004.1188.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

50

de Moura, Márcia R., Valtencir Zucolotto, Fauze A. Aouada y Luiz H. C. Mattoso. "Efficiency Improvement of Cellulose Derivative Nanocomposite Using Titanium Dioxide Nanoparticles". Journal of Nanoscience and Nanotechnology 17, n.º 3 (1 de marzo de 2017): 2206–11. http://dx.doi.org/10.1166/jnn.2017.13029.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Ofrecemos descuentos en todos los planes premium para autores cuyas obras están incluidas en selecciones literarias temáticas. ¡Contáctenos para obtener un código promocional único!