Immobilization of Camel Liver Catalase on Nanosilver-Coated Cotton Fabric

Nanoparticles have the advantage of a superior surface area to volume ratio, and thus such materials are useful for enzyme immobilization. A silver nanoparticle coated cotton fabric (AgNp-CF) is used to immobilize camel liver catalase in the present work. The effect of loading levels of AgNp inside cotton fabrics on the immobilization of catalase was investigated. The results revealed that a 6 mL loading level of AgNp precursor (silver nitrate, 2 mM) at pH 8 showed the maximum immobilization efficiency (76%). The morphological properties of the cotton fabric (CF), AgNp-CF and AgNp-CF-catalase were characterized by SEM. The reusability of the immobilized enzyme was tested over ten reuses to show a 67% retained function of its initial activity. Compared with the soluble enzyme’s working pH (6.5), a rather broader working pH (6.5–7.0) was observed for the immobilized catalase. Additionally, the optimum working temperature increased from 30 for the soluble enzyme to 40 °C for the immobilized one, indicating thermal stability. The free and immobilized catalase enzyme’s Km values were 22.5 and 25 mM H2O2, respectively, reflecting the enzyme’s effective properties. The inhibitory effect of metal ions on the enzyme activity was higher toward soluble catalase than the immobilized catalase. This work has developed a method for immobilizing catalase to be useful for several applications.

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Study of the geometry of open channels in a layer-bed-type microfluidic immobilized enzyme reactor

Analytical and Bioanalytical Chemistry ◽

10.1007/s00216-021-03588-x ◽

2021 ◽

Author(s):

Cynthia Nagy ◽

Robert Huszank ◽

Attila Gaspar

Keyword(s):

Immobilized Enzyme ◽

High Surface ◽

Volume Ratio ◽

Volumetric Flow Rate ◽

Enzyme Reactor ◽

Channel Pattern ◽

Immobilized Enzyme Reactor ◽

Split Flow ◽

Parallel Streams ◽

Enzymatic Microreactors

AbstractThis paper aims at studying open channel geometries in a layer-bed-type immobilized enzyme reactor with computer-aided simulations. The main properties of these reactors are their simple channel pattern, simple immobilization procedure, regenerability, and disposability; all these features make these devices one of the simplest yet efficient enzymatic microreactors. The high surface-to-volume ratio of the reactor was achieved using narrow (25–75 μm wide) channels. The simulation demonstrated that curves support the mixing of solutions in the channel even in strong laminar flow conditions; thus, it is worth including several curves in the channel system. In the three different designs of microreactor proposed, the lengths of the channels were identical, but in two reactors, the liquid flow was split to 8 or 32 parallel streams at the inlet of the reactor. Despite their overall higher volumetric flow rate, the split-flow structures are advantageous due to the increased contact time. Saliva samples were used to test the efficiencies of the digestions in the microreactors. Graphical abstract

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Fabrication and multifunctional properties of marigold-like nanostructured β-Ni(OH)2 coated cotton fabric

Cellulose ◽

10.1007/s10570-020-03594-9 ◽

2021 ◽

Author(s):

Malobi Seth ◽

Sunirmal Jana

Keyword(s):

Cotton Fabric ◽

Coated Cotton ◽

Multifunctional Properties

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Cellulose nanocrystal coated cotton fabric with superhydrophobicity for efficient oil/water separation

Carbohydrate Polymers ◽

10.1016/j.carbpol.2018.07.046 ◽

2018 ◽

Vol 199 ◽

pp. 390-396 ◽

Cited By ~ 51

Author(s):

Quan-Yong Cheng ◽

Cheng-Shu Guan ◽

Meng Wang ◽

Yi-Dong Li ◽

Jian-Bing Zeng

Keyword(s):

Cotton Fabric ◽

Cellulose Nanocrystal ◽

Water Separation ◽

Oil Water Separation ◽

Oil Water ◽

Coated Cotton

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Statistical optimization of open air dielectric barrier discharge plasma effect on self-cleaning activity of ultrasonically Cu2O/TiO2-coated cotton fabric

Applied Physics A ◽

10.1007/s00339-021-04908-9 ◽

2021 ◽

Vol 127 (10) ◽

Author(s):

M. Saleem ◽

M. Y. Naz ◽

S. Shukrullah ◽

M. A. Shujah ◽

Sami Ullah ◽

...

Keyword(s):

Dielectric Barrier Discharge ◽

Cotton Fabric ◽

Discharge Plasma ◽

Barrier Discharge ◽

Statistical Optimization ◽

Dielectric Barrier Discharge Plasma ◽

Dielectric Barrier ◽

Barrier Discharge Plasma ◽

Coated Cotton ◽

Plasma Effect

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Polypyrrole-coated cotton fabric decorated with silver nanoparticles for the catalytic removal of p-nitrophenol from water

Cellulose ◽

10.1007/s10570-018-2088-5 ◽

2018 ◽

Vol 25 (12) ◽

pp. 7393-7407 ◽

Cited By ~ 8

Author(s):

Mohamad M. Ayad ◽

Wael A. Amer ◽

Sawsan Zaghlol ◽

Nela Maráková ◽

Jaroslav Stejskal

Keyword(s):

Silver Nanoparticles ◽

Cotton Fabric ◽

Catalytic Removal ◽

Coated Cotton

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Energy Efficiency in the Urban Scale: Case Study – Prague, Czech Republic

Proceedings 24th ISUF 2017 - City and Territory in the Globalization Age ◽

10.4995/isuf2017.2017.5212 ◽

2017 ◽

Author(s):

Anna Yunitsyna ◽

Ernest Shtepani

Keyword(s):

Energy Efficiency ◽

Urban Form ◽

Volume Ratio ◽

Google Earth ◽

Morphological Properties ◽

Earth Model ◽

Geometrical Shape ◽

Urban Patterns ◽

Energy Efficiency Potential ◽

Gains And Losses

Cities are a complex mass of morphological properties of many city fragments, which play a major role in energy consumption. Urban form, urban patterns, or city fragments can also be seen as defined by algorithms or form generators. Cities are designed taking into account infrastructure, city standards and land use regulations. Energy efficiency of the urban form may be understood as the balance between gains and losses of energy, which may depend on a set of parameters mostly defined by the geometrical shape of the buildings and the distance between them. The study starts from the development and analysis of 60 hypothetical models in order to evaluate their energy efficiency potential. The Galapagos Evolutionary Solver is used as a tool in order to find the set of parameters, which brings to the morphological properties the optimal combination of density and surface-to-volume ratio. At the final stage morphological properties of 64 Prague’s patterns were selected. Computer simulation and analysis is performed using the models extracted from the virtual Google Earth model of Prague. During the process of evaluation of the samples, the relationship between the urban form and such parameters as plot coverage, surface-to-volume ratio and the incident solar radiation was established and potentially higher energy efficient structures were indicated. As the result of analysis the interrelation between urban form and energy efficiency was established, which allowed to identify the urban patterns with the higher potential of energy efficiency.

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Layer-by-layer Assembly Polyethylenimine/phytic Acid Coating With Gradient Structure for High-Efficiency and Durable Flame Retardant Cotton Fabric With Good Physical and Mechanical Properties

10.21203/rs.3.rs-697928/v1 ◽

2021 ◽

Author(s):

Xinhua Liu ◽

Hailong Liu ◽

Yinchun Fang

Keyword(s):

Physical Properties ◽

Flame Retardant ◽

Cotton Fabric ◽

High Efficiency ◽

Cotton Fabrics ◽

Gradient Structure ◽

Layer By Layer ◽

Assembly Method ◽

Lbl Assembly ◽

Coated Cotton

Abstract In this study, intumescent flame retardant coating of polyethylenimine/phytic acid (PEI/PA) with gradient structure was constructed on cotton fabric through facile layer-by-layer (LBL) assembly method. The LOI value of coated cotton fabric reached over 40% indicating excellent flame retardancy. Reasonable controlling the LBL assembly process of PEI/PA coating brought less influence to the physical properties of cotton fabrics. And the coated cotton fabric revealed good flame retardant washing durability. Thermogravimetric analysis results of coated cotton fabrics showed that PEI/PA flame retardant coating changed the thermal decomposition process and promoted char formation revealing the obviously condensed phase flame retardant action. SEM images of char residues revealed that PEI/PA flame retardant coating promoted to form the intumescent flame retardant (IFR) char layer showing obvious IFR action. This research provides novel strategy for the development of high-efficiency flame retardant cotton fabric with good durability and physical properties using simple LBL assembly method.

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Characterization of Electrical Heating Textile Coated by Graphene Nanoplatelets/PVDF-HFP Composite with Various High Graphene Nanoplatelet Contents

Polymers ◽

10.3390/polym11050928 ◽

2019 ◽

Vol 11 (5) ◽

pp. 928 ◽

Cited By ~ 5

Author(s):

Hyelim Kim ◽

Sunhee Lee

Keyword(s):

Sheet Resistance ◽

Cotton Fabric ◽

Electrical Heating ◽

Coated Sample ◽

Graphene Nanoplatelet ◽

Pattern Type ◽

Heating Performance ◽

Composite Solution ◽

Coated Cotton ◽

Conductive Yarn

We prepared a horseshoe-pattern type electrical heating textile that was coated with high graphene nanoplatelet (GNP) content (32 wt% to 64 wt%) of graphene nanoplatelet/poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) composite. Silver-coated conductive yarn is used as electrode in the sample to improve its flexibility and applicability as wearable textile. These graphene nanoplatelet/PVDF-HFP coated samples with various high-contents of graphene were characterized using scanning electron microscopy (SEM), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), X-ray diffraction (XRD), sheet resistance analysis, and electrical heating performance analysis. Graphene nanoplatelet/PVDF-HFP coated cotton fabric improved the crystallinity and thermal stability with increasing thw high-content of GNP. With an increasing of the high-content of graphene nanoplatelet in the PVDF-HFP composite solution, the sheet resistance of samples tended to gradually decrease. That of, 64 wt% graphene nanoplatelet/PVDF-HFP composite coated sample (64 GR/cotton) was 44 Ω/sq. The electrical heating performance of graphene nanoplatelet/PVDF-HFP composite coated cotton fabric was improved with increasing the high-content of graphene nanoplatelet. When 5 V was applied to 64 GR/cotton, its surface temperature has been indicated to be about 48 °C and it could be used at a low voltage (<10 V). Thus, a horseshoe-pattern type electrical heating textile that is coated by high content of graphene nanoplatelet/PVDF-HFP composite solution sewn with silver-coated conductive yarn is expected to be applied to glove, shoes, jacket, and so on to improve its wearability and applicability.

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A facile approach to prepare a flexible sandwich-structured supercapacitor with rGO-coated cotton fabric as electrodes

RSC Advances ◽

10.1039/c9ra00171a ◽

2019 ◽

Vol 9 (8) ◽

pp. 4180-4189 ◽

Cited By ~ 14

Author(s):

Yuzhou Li ◽

Yufan Zhang ◽

Haoran Zhang ◽

Tie-ling Xing ◽

Guo-qiang Chen

Keyword(s):

Cotton Fabric ◽

Energy Supply ◽

Electronic Equipment ◽

Supply Problem ◽

Wearable Electronic ◽

Coated Cotton

In recent years, the energy supply problem of wearable electronic equipment has become a topic of increasing concern. In this work, a solid, flexible and symmetrical supercapacitor based on graphene coated cotton fabric was fabricated.

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