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Journal articles on the topic 'Tempo stability'

Author: Grafiati

Published: 4 June 2021

Last updated: 12 February 2022

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1

Shadan, Farhad F. "Circadian tempo: A paradigm for genome stability?" Medical Hypotheses 68, no. 4 (2007): 883–91. http://dx.doi.org/10.1016/j.mehy.2006.08.020.

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2

Lapidaki, Eleni. "Stability of Tempo Perception in Music Listening." Music Education Research 2, no. 1 (2000): 25–44. http://dx.doi.org/10.1080/14613800050004413.

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3

Vu, Alexander, Lee Thompson, Erik Willcutt, and Stephen Petrill. "Sluggish cognitive tempo: longitudinal stability and validity." ADHD Attention Deficit and Hyperactivity Disorders 11, no. 4 (2019): 463–71. http://dx.doi.org/10.1007/s12402-019-00287-7.

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4

Bailes, Freya, and Linda Barwick. "Absolute Tempo in Multiple Performances of Aboriginal Songs: Analyzing Recordings of Djanba 12 and Djanba 14." Music Perception 28, no. 5 (2011): 473–90. http://dx.doi.org/10.1525/mp.2011.28.5.473.

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songs that are not notated but transmitted through live performance are of particular interest for the psychological study of the stability of tempo across multiple performances. While experimental research points to highly accurate memory for the tempi of well-known recorded music, this study asks whether there is any evidence of absolute tempo in a performance tradition that does not draw on such reference recordings. Fifty-four field recordings of performances of one Aboriginal dance-song, Djanba 14, were analyzed. Results showed that over a span of 34 years, performance tempi deviated posi

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5

Utama, A. R., and J. Julia. "The stability of Pianika’s tempo in elementary school students." Journal of Physics: Conference Series 1318 (October 2019): 012042. http://dx.doi.org/10.1088/1742-6596/1318/1/012042.

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6

Milanovic, Jovana, Sonja Schiehser, Antje Potthast, and Mirjana Kostic. "Stability of TEMPO-oxidized cotton fibers during natural aging." Carbohydrate Polymers 230 (February 2020): 115587. http://dx.doi.org/10.1016/j.carbpol.2019.115587.

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7

Barton, Scott, Laura Getz, and Michael Kubovy. "Systematic Variation in Rhythm Production as Tempo Changes." Music Perception 34, no. 3 (2017): 303–12. http://dx.doi.org/10.1525/mp.2017.34.3.303.

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We investigated the effect of tempo on the production of the syncopated 3-2 son clave rhythm. We recorded eleven experienced percussionists performing the clave pattern at tempi ranging from 70 bpm to 210 bpm. As tempo increased, percussionists shortened the longest intervals and lengthened the shortest interval towards an intermediate interval that is located in the first and second positions in the pattern. This intermediate interval was stable across tempi. Contrary to prior studies, we found that the complexity of interval ratios had little effect on production accuracy or stability and th

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8

Brodsky, Warren. "The effects of metronomic pendular adjustment versus tap-tempo input on the stability and accuracy of tempo perception." Cognitive Processing 6, no. 2 (2005): 117–27. http://dx.doi.org/10.1007/s10339-004-0037-8.

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Istomina, A. P., O. I. Bogdanova, D. R. Streltsov та S. N. Chvalun. "Stability of Suspensions of α-Chitin Nanocrystals Obtained by TEMPO Oxidation". Polymer Science, Series A 61, № 5 (2019): 589–97. http://dx.doi.org/10.1134/s0965545x19050080.

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10

Ciriano, Maria Victoria, Hans-Gert Korth, Wibo B. van Scheppingen, and Peter Mulder. "Thermal Stability of 2,2,6,6-Tetramethylpiperidine-1-oxyl (TEMPO) and RelatedN-Alkoxyamines." Journal of the American Chemical Society 121, no. 27 (1999): 6375–81. http://dx.doi.org/10.1021/ja9837102.

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11

Geng, Cunzhen, Zhihui Zhao, Zhixin Xue, Peilong Xu, and Yanzhi Xia. "Preparation of Ion-Exchanged TEMPO-Oxidized Celluloses as Flame Retardant Products." Molecules 24, no. 10 (2019): 1947. http://dx.doi.org/10.3390/molecules24101947.

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Cellulose, as one of the most abundant natural biopolymers, has been widely used in textile industry. However, owing to its drawbacks of flammability and ignitability, the large-scale commercial application of neat cellulose is limited. This study investigated some TEMPO-oxidized cellulose (TOC) which was prepared by selective TEMPO-mediated oxidation and ion exchange. The prepared TOC was characterized by Fourier transform infrared (FT-IR) spectroscopy and solid-state 13C-nuclear magnetic resonance (13C-NMR) spectroscopy. The thermal stability and combustion performance of TOC were investigat

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12

Lazcano, Antonio. "The Tempo and mode(S) of Prebiotic Evolution." International Astronomical Union Colloquium 161 (January 1997): 419–29. http://dx.doi.org/10.1017/s0252921100014937.

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AbstractDifferent current ideas on the origin of life are critically examined. Comparison of the now fashionable FeS/H2S pyrite-based autotrophic theory of the origin of life with the heterotrophic viewpoint suggest that the later is still the most fertile explanation for the emergence of life. However, the theory of chemical evolution and heterotrophic origins of life requires major updating, which should include the abandonment of the idea that the appearance of life was a slow process involving billions of years. Stability of organic compounds and the genetics of bacteria suggest that the o

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13

Karageorghis, Costas I., and Leighton Jones. "On the stability and relevance of the exercise heart rate–music-tempo preference relationship." Psychology of Sport and Exercise 15, no. 3 (2014): 299–310. http://dx.doi.org/10.1016/j.psychsport.2013.08.004.

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14

Yang, Weisheng, Huiyang Bian, Liang Jiao, Weibing Wu, Yulin Deng, and Hongqi Dai. "High wet-strength, thermally stable and transparent TEMPO-oxidized cellulose nanofibril film via cross-linking with poly-amide epichlorohydrin resin." RSC Advances 7, no. 50 (2017): 31567–73. http://dx.doi.org/10.1039/c7ra05009g.

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15

Rayon, Teresa, Despina Stamataki, Ruben Perez-Carrasco, et al. "Species-specific pace of development is associated with differences in protein stability." Science 369, no. 6510 (2020): eaba7667. http://dx.doi.org/10.1126/science.aba7667.

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Although many molecular mechanisms controlling developmental processes are evolutionarily conserved, the speed at which the embryo develops can vary substantially between species. For example, the same genetic program, comprising sequential changes in transcriptional states, governs the differentiation of motor neurons in mouse and human, but the tempo at which it operates differs between species. Using in vitro directed differentiation of embryonic stem cells to motor neurons, we show that the program runs more than twice as fast in mouse as in human. This is not due to differences in signali

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Walker, Karolina A., Michael L. Unbehauen, Silke B. Lohan, et al. "Spin-labeling of Dexamethasone: Radical Stability vs. Temporal Resolution of EPR-Spectroscopy on Biological Samples." Zeitschrift für Physikalische Chemie 232, no. 5-6 (2018): 883–91. http://dx.doi.org/10.1515/zpch-2017-1076.

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AbstractSpin-labeling active compounds is a convenient way to prepare them for EPR spectroscopy with minimal alteration of the target molecule. In this study we present the labeling reaction of dexamethasone (Dx) with either TEMPO (2,2,6,6-tetramethyl-1-piperidinyloxy) or PCA (3-(carboxy)-2,2,5,5-tetramethyl-1-pyrrolidinyloxy) with high yields. According to NMR data, both labels are attached at the primary hydroxy group of the steroid. In subsequent spin-stability measurements both compounds were applied onto HaCaT cells. When the signal of Dx-TEMPO decreased below the detection limit within 3

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17

Johnson, Randolph B. "Musical tempo stability in mental practice: A comparison of motor and non-motor imagery techniques." Research Studies in Music Education 33, no. 1 (2011): 3–30. http://dx.doi.org/10.1177/1321103x11400501.

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18

Wei, Jiaxin, Baoxiu Wang, Zhe Li, et al. "A 3D-printable TEMPO-oxidized bacterial cellulose/alginate hydrogel with enhanced stability via nanoclay incorporation." Carbohydrate Polymers 238 (June 2020): 116207. http://dx.doi.org/10.1016/j.carbpol.2020.116207.

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19

Indarti, Eti, Marwan, and Wanrosli Wan Daud. "Dispersion Stability of Nanocellulose in Nonpolar Solvent: Chloroform." Materials Science Forum 998 (June 2020): 170–75. http://dx.doi.org/10.4028/www.scientific.net/msf.998.170.

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Nanocellulose (NC) has been successfully isolated from Oil Palm Empty Fruit Bunch (OPEFB) by using catalyst 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO) through mediated oxidation process. For use as a reinforcing component in polymer bionanocomposites, NC has to be completely dried to avoid agglomeration in the non-polar solvent. In this research three types of approaches namely, oven drying (OD), freeze drying (FD) and solvent exchange (SE) were used to remove the water. Based on the dispersion stability results, the NC prepared from the OD technique gave longer stable suspension tha

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20

Parker, Helen E., Dawne Larkin, and Michael G. Wade. "Are Motor Timing Problems Subgroup Specific in Children with Developmental Coordination Disorder?" Australian Educational and Developmental Psychologist 14, no. 1 (1997): 35–42. http://dx.doi.org/10.1017/s0816512200027632.

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ABSTRACTThis study investigated subgroup and task specificity of self-paced timing in children with developmental coordination disorder (DCD). Self-paced tempo (intertap interval) and timing stability (coefficient of variation) were measured in three repetitive tasks—hand tapping, foot tapping, and jumping in place—in 37 children aged 6 to 9 years classified into gross motor impaired (GM), fine and gross motor impaired (F&G), or coordinated control (CC) groups. Results showed that, although tempo did not vary between coordination groups, timing stability for the hand was significantly wors

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21

Owens, Hannah Lois, and Robert Guralnick. "climateStability: An R package to estimate climate stability from time-slice climatologies." Biodiversity Informatics 14 (June 3, 2019): 8–13. http://dx.doi.org/10.17161/bi.v14i0.9786.

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As continental and global-scale paleoclimate model data become more readily available, biologists can now ask spatially explicit questions about the tempo and mode of past climate change and the impact of those changes on biodiversity patterns. In particular, researchers have focused on climate stability as a key variable that can drive expected patterns of richness, phylogenetic diversity and functional diversity. Yet, climate stability measures are not formalized in the literature and tools for generating stability metrics from existing data are nascent. Here we define “deviation” of a clima

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22

Panaitescu, Denis Mihaela, Sorin Vizireanu, Sergiu Alexandru Stoian, et al. "Poly(3-hydroxybutyrate) Modified by Plasma and TEMPO-Oxidized Celluloses." Polymers 12, no. 7 (2020): 1510. http://dx.doi.org/10.3390/polym12071510.

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Microcrystalline cellulose (MCC) was surface modified by two approaches, namely a plasma treatment in liquid using a Y-shaped tube for oxygen flow (MCC-P) and a TEMPO mediated oxidation (MCC-T). Both treatments led to the surface functionalization of cellulose as illustrated by FTIR and XPS results. However, TEMPO oxidation had a much stronger oxidizing effect, leading to a decrease of the thermal stability of MCC by 80 °C. Plasma and TEMPO modified celluloses were incorporated in a poly(3-hydroxybutyrate) (PHB) matrix and they influenced the morphology, thermal, and mechanical properties of t

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23

Li, Danjie, Xianbo Shen, Liang Chen, Huanchang Jiang, and Jianli Wang. "The stability of covalently immobilization of TEMPO on the polymer surface through ionic liquid linkage: a comparative and model research." e-Polymers 15, no. 1 (2015): 39–44. http://dx.doi.org/10.1515/epoly-2014-0027.

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AbstractCovalently immobilizing the active sites or ligands on a polymer surface is an efficient strategy to achieve a full use of expensive organic parts. In this work, 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) was anchored onto polystyrene beads through an ether bond or an ionic liquid bridge. We quantitatively compared their thermal stabilities at nitrogen atmosphere and their chemical stabilities in a biphasic oxidation surrounding. It was found that the ionic liquid-bridged TEMPO exhibited an additional advantage of stability and could be reused for 30 consecutive recycles with a conve

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24

Liu, Bin, Chun Wai Tang, Haoran Jiang, Guochen Jia, and Tianshou Zhao. "Carboxyl-Functionalized TEMPO Catholyte Enabling High-Cycling-Stability and High-Energy-Density Aqueous Organic Redox Flow Batteries." ACS Sustainable Chemistry & Engineering 9, no. 18 (2021): 6258–65. http://dx.doi.org/10.1021/acssuschemeng.0c08946.

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25

Smith, Craig R. "Tempo and mode in deep-sea benthic ecology: punctuated equilibrium revisited." Paleontological Society Special Publications 6 (1992): 274. http://dx.doi.org/10.1017/s2475262200008340.

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The deep-sea floor is traditionally perceived as a remote and deliberate environment; a habitat where a gentle rain of detrital food particles and sluggish bottom currents force biological processes to proceed at slow, steady rates. In this view, benthic community structure is controlled by equilibrium processes, such as extreme levels of habitat partitioning (e.g., “grain matching”) made possible by remarkable ecosystem stability. A number of recent discoveries indicate, however, that the deep-sea floor may be neither remote nor deliberate. Pulses of food and kinetic energy rapidly reach the

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26

Huang, Guohui, Xiaoxuan Liu, Yiling Bei, and Huiqing Ma. "Facile TEMPO Immobilization onto Poly(acrylic acid)-Modified Magnetic Nanoparticles: Preparation and Property." International Journal of Polymer Science 2017 (2017): 1–8. http://dx.doi.org/10.1155/2017/9621635.

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Adding catalysts to magnetic polyvalent supports facilitating catalyst recycling and recovery seems feasible. Polymer-modified magnetic nanocomposites for organocatalyst immobilization are a plausible approach to this technology. Here, we present facile and efficient method for 2,2′,6,6′-tetramethylpiperidinyl-1-oxy (TEMPO) immobilization onto polymer-modified magnetic nanoparticles under mild reaction conditions. Poly(acrylic acid) was chosen to graft from magnetic nanoparticle through a simple inverse emulsion polymerization technique. The resulting poly(acrylic acid) magnetic nanocomposite

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27

Zamm, Anna, Youyi Wang, and Caroline Palmer. "Musicians’ Natural Frequencies of Performance Display Optimal Temporal Stability." Journal of Biological Rhythms 33, no. 4 (2018): 432–40. http://dx.doi.org/10.1177/0748730418783651.

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Many human action sequences, such as speaking and performing music, are inherently rhythmic: Sequence events are produced at quasi-regular temporal intervals. A wide range of interindividual variation has been noted in spontaneous production rates of these rhythmic action sequences. Dynamical theories of motor coordination suggest that individuals spontaneously produce rhythmic sequences at a natural frequency characterized by minimal energy expenditure and maximal temporal stability, relative to other frequencies. We tested this hypothesis by comparing the temporal variability with which musi

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Takaishi, Taigo, Hirofumi Inada, Yuya Arakawa, and Takeo Kitamura. "Effect of Adding TEMPO-oxidized Cellulose Nanofiber on Dispersion Stability of Ceramic Slurry and Ceramic Slip Casting Method." Journal of the Society of Powder Technology, Japan 56, no. 10 (2019): 573–78. http://dx.doi.org/10.4164/sptj.56.573.

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29

Hakalahti, Minna, Arto Salminen, Jukka Seppälä, Tekla Tammelin, and Tuomas Hänninen. "Effect of interfibrillar PVA bridging on water stability and mechanical properties of TEMPO/NaClO2 oxidized cellulosic nanofibril films." Carbohydrate Polymers 126 (August 2015): 78–82. http://dx.doi.org/10.1016/j.carbpol.2015.03.007.

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30

Fukuzumi, Hayaka, Reina Tanaka, Tsuguyuki Saito, and Akira Isogai. "Dispersion stability and aggregation behavior of TEMPO-oxidized cellulose nanofibrils in water as a function of salt addition." Cellulose 21, no. 3 (2014): 1553–59. http://dx.doi.org/10.1007/s10570-014-0180-z.

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31

Nikolic, Tanja, Matea Korica, Jovana Milanovic, Ana Kramar, Zivomir Petronijevic, and Mirjana Kostic. "TEMPO-oxidized cotton as a substrate for trypsin immobilization: impact of functional groups on proteolytic activity and stability." Cellulose 24, no. 4 (2017): 1863–75. http://dx.doi.org/10.1007/s10570-017-1221-1.

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32

Rahmadiawan, Dieter, Hairul Abral, N. Nasruddin, and Zahrul Fuadi. "Stability, Viscosity, and Tribology Properties of Polyol Ester Oil-Based Biolubricant Filled with TEMPO-Oxidized Bacterial Cellulose Nanofiber." International Journal of Polymer Science 2021 (April 15, 2021): 1–9. http://dx.doi.org/10.1155/2021/5536047.

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This research is aimed at studying the stability and tribology properties of the polyol ester oil- (POE-) based biolubricant mixed with various filler loadings from microparticle of TEMPO-oxidized bacterial cellulose (NDCt) as an additive and sorbitan monostearate (Span 60) as a surfactant. Morphology, rheology, and tribology tests were conducted. The addition of NDCt and Span 60 to pure POE as a base fluid showed elevated viscosity, lower value of coefficient friction (COF), and a remarkable decrease in the wear rate (WR). The presence of 0.6 wt% NDCt and 1.8 wt% Span 60 in POE (N2S4) decreas

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33

Du, Shuming, Jie Zhang, Yan Guan, and Xinhua Wan. "Sequence Effects on Properties of the Poly(p-phenylene terephthalamide)-based Macroinitiators and their Comb-like Copolymers Grafted by Polystyrene Side Chains." Australian Journal of Chemistry 67, no. 1 (2014): 39. http://dx.doi.org/10.1071/ch13291.

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Two poly(p-phenylene terephthalamide) (PPTA)-based macroinitiators with random and alternate sequences, i.e. poly(p-phenylene terephthalamide)-ran-poly[p-phenylene (2,2,6,6-tetramethylpiperidinyl-1-oxy)terephthalamide)] (CPPTA-ran) and poly(p-phenylene terephthalamide)-alt-poly[p-phenylene (2,2,6,6-tetramethylpiperidinyl-1-oxy)terephthalamide)] (CPPTA-alt), were prepared via copolycondensation of terephthaloyl chloride, 2,2,6,6-tetramethylpiperidinyl-1-oxy (TEMPO)-functionalized terephthaloyl chloride, and p-phenylenediamine. The graft copolymers consisting of rigid PPTA backbones and polystyr

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34

Huang, Deyuan, Haoqun Hong, Weilong Huang, Haiyan Zhang, and Xiaobin Hong. "Scalable Preparation of Cellulose Nanofibers from Office Waste Paper by an Environment-Friendly Method." Polymers 13, no. 18 (2021): 3119. http://dx.doi.org/10.3390/polym13183119.

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Waste paper is often underutilized as a low-value recyclable resource and can be a potential source of cellulose nanofibers (CNFs) due to its rich cellulose content. Three different processes, low acid treatment, alkali treatment and bleaching treatment, were used to pretreat the waste paper in order to investigate the effect of different pretreatments on the prepared CNFs, and CNFs obtained from bleached pulp boards were used as control. All sample fibers were successfully prepared into CNFs by 2,2,6,6-tetramethyl-piperidine-1-oxyl (TEMPO) oxidation. It was quite obvious that the bleached CNF

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35

Nuernberger, Renan. "O incômodo do tempo em João Cabral de Melo Neto / The Discomfort of Time in João Cabral de Melo Neto." O Eixo e a Roda: Revista de Literatura Brasileira 29, no. 2 (2020): 9. http://dx.doi.org/10.17851/2358-9787.29.2.9-36.

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Resumo: Este artigo aborda a meditação sobre o tempo implicada no projeto poético de João Cabral de Melo Neto. Partindo de algumas considerações teóricas do próprio poeta, propõe-se uma análise de sua obra, enfatizando as mudanças na formulação do embate entre o anseio de permanência de sua poética mineral e os efeitos transformadores da passagem do tempo. Se é verdade que, em poemas como “Pequena ode mineral”, a racionalidade construtiva aspira a uma forma absolutamente estável que se daria “fora do tempo”, este artigo pretende demonstrar que, em outros momentos, a poesia de Cabral parece pro

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36

Zhu, Zhongliang, James C. Fettinger, Marilyn M. Olmstead, and Philip P. Power. "Steric Enhancement of Group 12 Metal Hydride Stability and the Reaction of an Arylzinc Hydride with Tetramethylpiperidinyl Oxide (TEMPO)." Organometallics 28, no. 7 (2009): 2091–95. http://dx.doi.org/10.1021/om900005t.

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37

Leopold, Daniel R., Micaela E. Christopher, G. Leonard Burns, Stephen P. Becker, Richard K. Olson, and Erik G. Willcutt. "Attention-deficit/hyperactivity disorder and sluggish cognitive tempo throughout childhood: temporal invariance and stability from preschool through ninth grade." Journal of Child Psychology and Psychiatry 57, no. 9 (2016): 1066–74. http://dx.doi.org/10.1111/jcpp.12505.

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38

Bascón-Villegas, Isabel, Eduardo Espinosa, Rafael Sánchez, Quim Tarrés, Fernando Pérez-Rodríguez, and Alejandro Rodríguez. "Horticultural Plant Residues as New Source for Lignocellulose Nanofibers Isolation: Application on the Recycling Paperboard Process." Molecules 25, no. 14 (2020): 3275. http://dx.doi.org/10.3390/molecules25143275.

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Horticultural plant residues (tomato, pepper, and eggplant) were identified as new sources for lignocellulose nanofibers (LCNF). Cellulosic pulp was obtained from the different plant residues using an environmentally friendly process, energy-sustainable, simple, and with low-chemical reagent consumption. The chemical composition of the obtained pulps was analyzed in order to study its influence in the nanofibrillation process. Cellulosic fibers were subjected to two different pretreatments, mechanical and TEMPO(2,2,6,6-Tetramethyl-piperidin-1-oxyl)-mediated oxidation, followed by high-pressure

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39

Clynes, Manfred, and Janice Walker. "Music as Time's Measure." Music Perception 4, no. 1 (1986): 85–119. http://dx.doi.org/10.2307/40285353.

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Repeated public performances including Beethoven Opus 130, 133, Haydn Opus 76, No. 5, Ravel Quartet, Janacek Quartet 2 by a well-known string quartet recorded live over a number of years in various cities and concert halls (a total of 170 entire movements) when analyzed show a striking long term ultrastability of timing; of the order of 0,2–0.6% for a number of fast and moderately fast movements. Stability was as good as that previously observed for single performers including Toscanini (Clynes & Walker, 1982; Clynes 1969). This indicates that shared musical concepts can be highly stable.

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40

Fukuda, Naoya, Mayumi Hatakeyama, and Takuya Kitaoka. "Enzymatic Preparation and Characterization of Spherical Microparticles Composed of Artificial Lignin and TEMPO-Oxidized Cellulose Nanofiber." Nanomaterials 11, no. 4 (2021): 917. http://dx.doi.org/10.3390/nano11040917.

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A one-pot and one-step enzymatic synthesis of submicron-order spherical microparticles composed of dehydrogenative polymers (DHPs) of coniferyl alcohol as a typical lignin precursor and TEMPO-oxidized cellulose nanofibers (TOCNFs) was investigated. Horseradish peroxidase enzymatically catalyzed the radical coupling of coniferyl alcohol in an aqueous suspension of TOCNFs, resulting in the formation of spherical microparticles with a diameter and sphericity index of approximately 0.8 μm and 0.95, respectively. The ζ-potential of TOCNF-functionalized DHP microspheres was about −40 mV, indicating

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41

Lavoine, Nathalie, Julien Bras, Tsuguyuki Saito, and Akira Isogai. "Improvement of the Thermal Stability of TEMPO-Oxidized Cellulose Nanofibrils by Heat-Induced Conversion of Ionic Bonds to Amide Bonds." Macromolecular Rapid Communications 37, no. 13 (2016): 1033–39. http://dx.doi.org/10.1002/marc.201600186.

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42

Yang, Weisheng, Liang Jiao, Wei Liu, and Hongqi Dai. "Manufacture of Highly Transparent and Hazy Cellulose Nanofibril Films via Coating TEMPO-Oxidized Wood Fibers." Nanomaterials 9, no. 1 (2019): 107. http://dx.doi.org/10.3390/nano9010107.

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Traditionally, inorganic nanoparticles (SiO2, TiO2) have been utilized to tune the optical haze of optoelectronic devices. However, restricted to complex and costly processes for incorporating these nanoparticles, a simple and low-cost approach becomes particularly important. In this work, a simple, effective, and low-cost method was proposed to improve optical haze of transparent cellulose nanofibril films by directly depositing micro-sized 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-oxidized wood fibers (“coating” method). The obtained films had a high total transmittance of 85% and a high

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43

Sánchez-Gutiérrez, Mónica, Eduardo Espinosa, Isabel Bascón-Villegas, Fernando Pérez-Rodríguez, Elena Carrasco, and Alejandro Rodríguez. "Production of Cellulose Nanofibers from Olive Tree Harvest—A Residue with Wide Applications." Agronomy 10, no. 5 (2020): 696. http://dx.doi.org/10.3390/agronomy10050696.

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With the aim of identifying new sources to produce cellulose nanofibers, olive tree pruning biomass (OTPB) was proposed for valorization as a sustainable source of cellulose. OTPB was subjected to a soda pulping process for cellulose purification and to facilitate the delamination of the fiber in the nanofibrillation process. Unbleached and bleached pulp were used to study the effect of lignin in the production of cellulose nanofibers through different pretreatments (mechanical and TEMPO-mediated oxidation). High-pressure homogenization was used as the nanofibrillation treatment. It was observ

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Jonasson, Simon, Anne Bünder, Totte Niittylä, and Kristiina Oksman. "Isolation and characterization of cellulose nanofibers from aspen wood using derivatizing and non-derivatizing pretreatments." Cellulose 27, no. 1 (2019): 185–203. http://dx.doi.org/10.1007/s10570-019-02754-w.

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Abstract The link between wood and corresponding cellulose nanofiber (CNF) behavior is complex owing the multiple chemical pretreatments required for successful preparation. In this study we apply a few pretreatments on aspen wood and compare the final CNF behavior in order to rationalize quantitative studies of CNFs derived from aspen wood with variable properties. This is relevant for efforts to improve the properties of woody biomass through tree breeding. Three different types of pretreatments were applied prior to disintegration (microfluidizer) after a mild pulping step; derivatizing TEM

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Hemraz, Usha D., Yaman Boluk, and Rajesh Sunasee. "Amine-decorated nanocrystalline cellulose surfaces: synthesis, characterization, and surface properties." Canadian Journal of Chemistry 91, no. 10 (2013): 974–81. http://dx.doi.org/10.1139/cjc-2013-0165.

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In this present work, terminal amino-functionalized nanocrystalline cellulose derivatives were prepared using a simple two-step protecting group-free protocol under aqueous reaction conditions at room temperature. Carboxylate groups were first introduced onto the surface of nanocrystalline cellulose (NCC) via a TEMPO-mediated oxidation. Then, reaction of surface-carboxylated NCC with bifunctional amines of small alkyl chain length by EDC/NHS-mediated coupling furnished the desired aminated NCC via an amide linkage. Surface covalent functionalization was confirmed by Fourier transform infrared

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Tsehaye, Misgina, Xian Yang, Tobias Janoschka, et al. "Study of Anion Exchange Membrane Properties Incorporating N-spirocyclic Quaternary Ammonium Cations and Aqueous Organic Redox Flow Battery Performance." Membranes 11, no. 5 (2021): 367. http://dx.doi.org/10.3390/membranes11050367.

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Flexible cross-linked anion exchange membranes (AEMs) based on poly (p-phenylene oxide) grafted with N-spirocyclic quaternary ammonium cations were synthesized via UV-induced free-radical polymerization by using diallylpiperidinium chloride as an ionic monomer. Five membranes with ion exchange capacity (IEC) varying between 1.5 to 2.8 mmol Cl−·g−1 polymer were obtained and the correlation between IEC, water uptake, state of water in the membrane and ionic conductivity was studied. In the second part of this study, the influence of properties of four of these membranes on cell cycling stability

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Siqueira, Priscila, Éder Siqueira, Ana Elza De Lima, et al. "Three-Dimensional Stable Alginate-Nanocellulose Gels for Biomedical Applications: Towards Tunable Mechanical Properties and Cell Growing." Nanomaterials 9, no. 1 (2019): 78. http://dx.doi.org/10.3390/nano9010078.

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Hydrogels have been studied as promising materials in different biomedical applications such as cell culture in tissue engineering or in wound healing. In this work, we synthesized different nanocellulose-alginate hydrogels containing cellulose nanocrystals, TEMPO-oxidized cellulose nanocrystals (CNCTs), cellulose nanofibers or TEMPO-oxidized cellulose nanofibers (CNFTs). The hydrogels were freeze-dried and named as gels. The nanocelluloses and the gels were characterized by different techniques such as Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmi

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Indarti, Eti, and W. D. Wan Rosli. "Effects of Drying Techniques on the Crystallinity and Thermal Properties of Empty Fruit Bunch Nanocrystalline Cellulose." Key Engineering Materials 708 (September 2016): 20–24. http://dx.doi.org/10.4028/www.scientific.net/kem.708.20.

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The effect of drying techniques on the crystallinity and thermal stability nanocrystalline cellulose (NCC) prepared from oil palm empty fruit bunch (OPEFB) via the TEMPO-oxidation process was investigated. NCC was subjected to three separate drying techniques viz. oven drying (OD), freeze drying (FD) and solvent exchange (SE). The crystallinity and thermal properties were investigated for all samples using DSC and X-ray diffraction (XRD). There is no significant difference in the degree of crystallinity for both OD-NCC and FD-NCC as compared to the starting material of unbleached pulp (UP) (72

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Lai, Chiu-Chun, Pei-Yun Shih, Guan-Yu Chu, and Yi-Ching Sung. "Preparation and characterization of the nanocellulose/polyurethane films." Modern Physics Letters B 34, no. 07n09 (2020): 2040007. http://dx.doi.org/10.1142/s0217984920400072.

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In this research, we make the nanocellulose (NC) using acid hydrolysis and 2,2,6,6-Tetramethylpiperidine-1-oxyl (TEMPO) method from bacterial cellulose (BC), dispersed in water, incorporated into polyurethane (PU) resin, prepared the composed film and characterized by scanning electronic microscopy (SEM), tensile test, and Thermogravimetric analysis (TGA). The NC is introduced into the PU resin by physical means to increase the physical and chemical properties of the waterborne PU. First, the morphological properties of NC, measured by SEM images, tensile test and thermal properties were measu

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Rodrigues, João Lucas. "O parentesco escravo nas terras da família Maia: Sul de Minas, 1811 a 1860 (The slave parentage in the lands of the Maia family: southern Minas Gerais, 1811-1860)." Cadernos de História 16, no. 25 (2015): 239. http://dx.doi.org/10.5752/p.2237-8871.2015v16n25p239.

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<p>Durante o século XIX, a família Maia construiu um patrimônio avultado na localidade de Camanducaia, no Sul de Minas Gerais. Na montagem do empreendimento agrícola, como em outras grandes propriedades da região, um número expressivo de escravos foi adquirido. O presente trabalho tem por objetivo analisar as relações parentais construídas por esses cativos no decorrer do século XIX, especificamente, no período de 1811 a 1860. Cruzando informações provenientes de fontes diversas, analisamos a formação das uniões conjugais, as alianças tecidas mediante as relações de compadrio e, ainda, a

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