Transparent Cellulose‐Based Film with High UV‐Blocking Performance Fabricated by Surface Modification using Biginelli Reaction
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Abstract:
Efficient and sustainable ultraviolet (UV)-blocking materials are of great interest in many fields. Herein, novel cellulose-based UV-blocking films are developed via surface modification using the Biginelli reaction. The resulting films exhibited excellent visible transparency (80%) at 550 nm and superhigh UV-blocking performance, which can shield almost 100% UVA and UVB. These features are very stable even the materials are being subjected to solvents, UV irradiation, and thermal treatment. This work provides a novel and facile strategy to fabricate functional cellulose-based films with superhigh anti-ultraviolet performance.Keywords:
Ultraviolet
Surface Modification
Blocking (statistics)
Degradation
Thermal Stability
Surface Modification
Triethoxysilane
Silanes
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Blocking is a difficult problem to solve in the process of image processing and moving object tracking.Aiming at the problem for vehicles blocking in traffic videos,this paper proposes a vehicles blocking segmentation algorithm based on a statistical model.To get the whole area of moving vehicles,the algorithm removes empty space in the foreground template,using the horizontal-vertical scanning method,based on the extraction of moving vehicles.Then the occurrence of blocking is determined by the statistical model.If the vehicles are blocked,the method will get the right blocking points and identify the blocking regions under the premise of adding error correction mechanism.Finally,it has divided out the blocking area by edge detection,so as to obtain the completely separated vehicles.Besides,the experimental results show that this method is able to well solve the problem of partial blocking of vehicles.
Blocking (statistics)
Blocking effect
Tracking (education)
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The removal of excess CO2 from the atmosphere is expected to play a major role in the mitigation of global warming. Solid-state adsorbents, consisting of CO2-binding functionalities on porous supports, can provide high CO2 capture capacities with low energy requirements. In this contribution, we report on the vapor-phase functionalization of porous carbon fibers with amine functionalities. Functionalization occurs either via direct exposure to cyclic azasilane molecules (2,2-dimethoxy-1,6-diaza-2-silacyclooctane) or by the atomic layer deposition of Al2O3 followed by exposure to azasilane. XPS analysis and SEM/energy-dispersive x-ray spectroscopy (EDX) measurements confirmed Al2O3 deposition and amine functionalization. Yet, the two different functionalization approaches led to different amine loadings and distinct differences in porosity upon functionalization, which affected CO2 capture. Combining Al2O3 and amine functionalization resulted in fast CO2 sorption with superior capturing efficiency. In contrast, direct functionalization resulted in strong reduction of the surface area of the porous support and limited gas exchange. We attribute the superior capture efficiency to the porosity level achieved when combining Al2O3 and amine functionalization demonstrating that this approach might be valuable for compact high-throughput direct air, CO2 capture systems.
Surface Modification
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A thermally induced functionalization process for gallium nitride surfaces with 1-alkenes is introduced. The resulting functionalization layers are characterized with atomic force microscopy and X-ray photoelectron spectroscopy and compared to reference samples without and with a photochemically generated functionalization layer. The resulting layers show very promising characteristics as functionalization for GaN based biosensors. On the basis of the experimental results, important characteristics of the functionalization layers are estimated and a possible chemical reaction scheme is proposed.
Surface Modification
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In this paper,the thermal stability of the cellulose was investigated.The results are as follows: The cellulose were not degradative after 60 days under room temperature.And the higher the temperature and the longer the time of the cellulose being heated,the more degradation of the cellulose.
Thermal Stability
Degradation
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Surface Modification
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This chapter contains sections titled: 4.4 Esterification of Cellulose 4.4.1 Esters of cellulose with inorganic acids 4.4.1.1 Cellulose nitrate 4.4.1.2 Cellulose nitrite 4.4.1.3 Cellulose sulfates 4.4.1.4 Cellulose phosphate and other phosphorus-containing cellulose derivatives 4.4.1.5 Cellulose borates 4.4.1.6 Desoxycelluloses
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Abstract Cellulose esters are cellulose derivatives which result from the esterification of the free hydroxyl groups of cellulose with one or more acids. Cellulose nitrate is the oldest cellulose derivative and the only inorganic ester of commercial importance. Manufacturing and uses of sulfur‐ and phosphorus containing cellulose esters are discussed. An analysis of the oldest and most important inorganic ester of cellulose, cellulose nitrate, is presented.
Derivative (finance)
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Hemicellulose
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