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排序方式: 共有140条查询结果,搜索用时 31 毫秒
61.
《Food research international (Ottawa, Ont.)》2003,36(1):91-96
Microscopic examination showed a change on the surface structure of dietary fibers (DF) from rice straw (RS) and sugarcane bagasse (SB) by alkaline hydrogen peroxide (AHP) treatment. Effect of particle size on in-vitro binding of calcium (Ca) and magnesium (Mg) of AHP-RS, AHP-SB and Solka Floc® 900 (SF) were evaluated. Total bound Ca and Mg decreased with particle size reduction (P<0.05) for all types of DF. Ca and Mg (82–95%) were released from AHP-RS and AHP-SB by acid washing but only 53–60% Mg was removed from SF. There were strong correlations between water holding capacity, oil binding capacity and particle density and total bound Ca and Mg for all DF samples. 相似文献
62.
Microfibrillated cellulose (MFC) was obtained by mechanical grinding of different pulps. MFC-modified ground calcium carbonate (GCC) was prepared in two different ways, designated MFC-GCC composite filler and MFC-GCC flocs filler. The opacity of pulp handsheets loaded with MFC-modified GCC was measured. The effects of MFC originated from different pulps, pretreatment method, and filler modification on the opacity of handsheets loaded with MFC-modified GCC were discussed. The results show that MFC originated from alkaline peroxide mechanical pulp (APMP) was optimal for improving the opacity of the handsheets and PFI grinding pretreatment for MFC provided a denser structure in the corresponding MFCAPMP-GCC floc filler while enzyme pretreatment was more effective in increasing the opacity of the filled paper. Under the experimental conditions, the opacity of handsheets increased from 81.0% to 82.7% when the unmodified GCC was replaced by an equivalent amount of MFCAPMP-GCC composite filler, while other properties were unchanged. 相似文献
63.
Comparative study of coal,natural gas,and coke-oven gas based methanol to olefins processes in China
Traditional olefins production mainly depends on oil. In view of the short supply of oil, feedstocks are expanded to coal, natural gas, coke-oven gas, and methanol in China. In this paper, a comparative study of alternative olefins production is conducted from aspects of techno-economic feasibility and environmental friendliness. Results show that coal-to-olefins has a significant cost advantage. However, it suffers from low energy efficiency and serious CO2 emissions. To address these problems, this study proposes and analyses coal-to-olefins with CO2 capture, coal and natural gas-to-olefins, and coal and coke-oven gas-to-olefins. The two co-feed systems ensure great reduction of CO2 emissions and significant improving energy efficiency. They should be actively developed in regions with rich coal and gas. While in regions with rich coal and lean gas, coal-to-olefins with CO2 capture should be developed in large scale. This paper also provides several suggestions on planning these olefins production routes in China. 相似文献
64.
Guanghui Song Yan Zhan Yajie Hu Jun Rao Nan Li Zhongxuan Wu Zhenhua Su Baozhong Lü Ruiping Liu Bo Jiang Gegu Chen Feng Peng 《Advanced functional materials》2023,33(26):2214044
Nanofluidic membranes consisting of 2D materials and polymers are considered promising candidates for harvesting osmotic energy from river estuaries owing to their unique ion channels. However, micron-scale polymer chains agglomerate in the nanochannels, resulting in steric hindrance and affection ion transport. Herein, a nanofluidic membrane is designed from MXene and xylan nanoparticles that are derived from paper-mill waste. The demonstrated membrane reinforced by paper-mill waste has the characteristics of green, low-cost, and outstanding performance in mechanical properties and surface-charge-governed ionic transport. The MXene/carboxmethyl xylan (CMX) membrane demonstrates a high surface charge (ζ-potential of −44.3 mV) and 12 times higher strength (284.96 MPa) than the pristine MXene membrane. The resulting membrane shows intriguing features of high surface charge, high ion selectivity, and reduced steric hindrance, enabling it high osmotic energy generation performance. A potential of the nanofluidic membrane is ≈109 mV, the corresponding current of up to 2.73 µA, and the output power density of 14.52 mW m−2 are obtained under a 1000-fold salt concentration gradient. As the electrolyte pH increases, the power density reaches 56.54 mW m−2. This works demonstrate that CMX nanoparticles can effectively enhance the properties of the nanofluidic membrane and provide a promising strategy to design high-performance nanofluidic devices. 相似文献
65.
An Individual Nanocube‐Based Plasmonic Biosensor for Real‐Time Monitoring the Structural Switch of the Telomeric G‐Quadruplex
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Yuanyuan Tian Lei Zhang Jingjing Shen Lingzhi Wu Hongzhang He Dik‐Lung Ma Chung‐Hang Leung Weibing Wu Quli Fan Wei Huang Lianhui Wang 《Small (Weinheim an der Bergstrasse, Germany)》2016,12(21):2913-2920
Promoted by the localized surface plasmon resonance nanotechnology, a simple and sensitive plasmonic aptamer nanosensor (nanoaptasensor) on an individual Au@Ag core‐shell nanocube (Au@Ag NC) has been proposed for real‐time monitoring of the formation process of G‐quadruplex structures and label‐free analysis of potassium ions (K+). In particular, the analysis of the thermodynamic parameters indicates that there are two types of binding states accompanied with a remarkable change of free energy (ΔG) in the sequential folding process of telomere DNA sequence. This nanoaptasensor has raised promising applications in monitoring the dynamic process of the structural switch of the G‐quadruplex. 相似文献
66.
利用金属-多酚网络(metal-polyphenol network,MPN)和不同程度羧基化改性制备的纤维素微纤丝(cellulose microfibrils,CMF)与胶原纤维(collagen fiber,CF)共混制成复合膜,探究CMF改性方式对复合膜性能的影响。结果表明:MPN改性的CMF能使复合膜抗氧化性能提高51.49%,断裂延伸率和阻光性也有显著提高;MPN和高含量羧甲基共同改性的CMF能最大程度降低MPN对复合膜机械强度的影响;MPN和高含量羧乙基共同改性的CMF能使复合膜对水蒸气和氧气的阻隔能力分别提高1.30 倍和3.48 倍。扫描电子显微镜和红外光谱分析表明不同方式改性的CMF与CF之间是物理交联且具有良好的相容性,从而为提高复合膜的性能以更好地应用到食品包装领域提供了一种新手段。 相似文献
67.
Single crystalline CuInS2 particles with a chalcopyrite structure and a size of 7–10 nm were prepared by a convenient solvothermal reaction, and characterized by XRD, XPS, TEM (HR-TEM) and UV–vis absorption spectroscopy. The as-synthesized nanoparticles can be redispersed in organic solvents, which will facilitate the practical application of these nanoparticles under organic-solution conditions. The growth of the CuInS2 is regarded to involve the formation and decomposition of Cu2+-thiourea complexes, the reduction of Cu2+ and a slow supply of In3+ ions in the crystallization solution. 相似文献
68.
Acid-rock drainage (ARD) is a widespread environmental problem that causes adverse effects to the quality of ground water and surface water through acidification, high concentration of the iron, sulphate, and elevated levels of soluble toxic metals. Active treatment technologies are often expensive and require regular attention resulting in increased overall costs due to operation and maintenance expenses. One of the effective treatment methods is to use sulphate-reducing prokaryotes (SRP) in bioreactors. They offer advantages such as high metal removal at low pH, stable sludge, very low operation costs, and minimal energy consumption. Sulphide precipitation is the desired mechanism of contaminant removal; however, many mechanisms including adsorption and precipitation of metal carbonates and hydroxides also occur in passive bioreactors. Several factors influencing the performance of the bioreactors are reviewed. The fundamental biochemical and microbiological reactions that occurs in the bioreactors has been dealt in detail. The present review presents performance of bioreactors, chemical characterisation of organic substrates for successful treatment of ARD. Moreover, design parameters, longevity and future scope of the study on bioreactors is also discussed in this review. 相似文献
69.
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