排序方式: 共有81条查询结果,搜索用时 107 毫秒
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《Ceramics International》2016,42(7):8604-8612
Hierarchically engineered asymmetric ceramic membrane is successfully fabricated, and special wettability is endowed to the membrane by introducing superhydrophilic and underwater superoleophobic silica nanoparticles through dip-coating technology onto the active separation layer. Effect of reaction temperature on the wettability of the silica nanoparticles is discussed. It has been found that the hydrophilicity of the silica increases with increasing the temperature and superhydrophilicity can be obtained when the temperature reaches to 60 °C. Underwater oil contact measurements are performed using a series of oils and it turns out the as-prepared material bear excellent oil repellency towards various oil droplets. Separation performance of the membrane for oily wastewater treatment was investigated. It has been revealed that the as-prepared membrane can successfully separate the oil contaminated wastewater within one step under a small applied pressure (0.1 MPa) with oil rejection coefficient R>99.95%, indicating an extremely high separation efficiency. 相似文献
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为了研究乳清分离蛋白对雪莲果浆起泡特性的影响,确定雪莲果浆真空泡沫干燥特性和数学模型,以雪莲果浆固形物含量、起泡剂种类及质量分数和搅拌时间为因素,以泡沫膨胀率、泡沫稳定性和泡沫密度为指标,研究了雪莲果浆的起泡工艺,得到了雪莲果浆适宜的起泡工艺参数:果浆固形物含量5%~7%,起泡剂15%乳清分离蛋白,稳定剂1%羧甲基纤维素钠,搅拌时间20 min。研究了不同温度(55、65、75℃)和真空度(0.075、0.095 MPa)下雪莲果浆的干燥特性。雪莲果浆干燥速率随着温度、真空度的升高而增加。与未经起泡处理的雪莲果浆相比,起泡处理显著增加了干燥过程中的有效水分扩散系数、降低了活化能,进而提高了果浆的干燥速率、缩短了干燥时间。用于描述雪莲果浆真空泡沫干燥的适宜模型为Midilli et al.模型。 相似文献
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采用静态吸附法研究了无水氯化钙、六偏磷酸钠、山梨糖醇、魔芋葡甘聚糖、壳聚糖、活性氧化铝粉和膨润土等7种吸湿剂在不同温度(2、10、18℃)和相对湿度RH(76%、86%、96%)下放置15 d时的吸湿特性。结果表明,温度一定时,吸湿量随RH升高而增加;RH一定时,吸湿量随温度变化略有差异。采用Weibull模型拟合吸湿量数据,得到吸湿动力学参数M∞和β,通过线性回归得到M∞和温湿度的关系。除山梨糖醇外,Weibull模型与吸湿量拟合精度较高。M∞较高的吸湿剂为无水氯化钙(1.117~2.137g H2O/g)、六偏磷酸钠(0.297~0.856 g H2O/g)和山梨糖醇(0.083~38.567 g H2O/g),其β值范围为:无水氯化钙(25.5~119.8 h)、六偏磷酸钠(91.2~290.0 h)和山梨糖醇(1.1~185.6 h)。壳聚糖和膨润土的M∞受温度、RH的共同影响,而六偏磷酸钠和山梨糖醇的M∞仅受RH的影响。研究结果可为双孢蘑菇MA贮藏期间RH控制提供理论依据。 相似文献
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本研究在酯化温度、酯化时间和浓硫酸用量三个单因素试验的基础上,利用响应面分析法,以酯化后脱臭馏出物的酸价和VE含量为评价指标,对游离脂肪酸酯化条件研究。结果表明,最佳酯化务件为酯化温度为65℃,酯化时间为3h,浓硫酸用量是4%(W/W)。 相似文献
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Jagan M. Billakanti Conan J. Fee Felicity R. Lane Ali Shiweh Kash Rayleen Fredericks 《International Dairy Journal》2010,20(2):96-105
A surface plasmon resonance (SPR) method is described for quantitative determination of α-lactalbumin, β-lactoglobulin, bovine serum albumin, lactoferrin and immunoglobulin G simultaneously in raw and processed milk samples, whey fractions and various milk-derived products, with six samples per assay. Immobilized antibody stability and reproducibility of analyses were studied over time for 25 independent runs (n = 150), giving a maximum relative standard deviation of <4%. Immobilized antibodies showed negligible non-specific interactions (<2–4 response units (RU)) and negligible cross-reactivity towards other milk components (<1 RU). Regeneration of immobilized antibodies with glycine at pH 1.75 was shown to be optimal for maintaining the SPR response between samples. The method compared well with reverse-phase liquid chromatography and standard enzyme-linked immunosorbent assays. Improved quantitation of samples containing both high and low abundance proteins was achieved by injecting each sample set twice, using different dilutions to match protein concentrations to their optimal calibration ranges. 相似文献
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根据感官评分确定雪莲果芹菜复合饮料的配方,研究黄原胶、卡拉胶、瓜尔豆胶、明胶、羧甲基纤维素钠、海藻酸钠等6种稳定剂对雪莲果芹菜复合饮料稳定性的影响,并通过正交试验确定复合饮料的最适稳定剂及其质量分数。结果表明,复合饮料配方为:雪莲果汁40%,芹菜汁20%,蛋白糖0.12%;对复合饮料稳定性较好的稳定剂及其质量分数范围为:黄原胶0.03%~0.09%、卡拉胶0.05%~0.15%、海藻酸钠0.05%~0.15%;复合稳定剂及其质量分数为:黄原胶0.07%,卡拉胶0.06%,海藻酸钠0.08%。 相似文献
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为改善高马铃薯全粉含量面团的品质特性,以普通面粉和马铃薯全粉为原料,研究了3种不同改良剂对含50%马铃薯全粉面团流变学特性的影响。结果表明,随谷朊粉、蛋清粉、海藻酸钠添加量的增加,面团的抗拉力呈先增大后减小的趋势。当谷朊粉、蛋清粉、海藻酸钠添加比例分别为4.5%、7%、0.6%时,面团抗拉力最大;流变学实验表明,添加改良剂的面团弹性模量和粘性模量均随着频率的不断增加而增大,且弹性模量均大于粘性模量。与对照组相比,添加改良剂能明显增加混合体系的粘弹性。添加改良剂后面团的损耗角正切值tanδ均小于1,表明改良剂的添加增强了面团的固体性质,使面团的机械强度增大。 相似文献