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排序方式: 共有100条查询结果,搜索用时 31 毫秒
1.
Changmook Kim Younghun Kim Pil Kim Jongheop Yi 《Korean Journal of Chemical Engineering》2003,20(6):1142-1144
A salt of stearic acid, i.e., magnesium stearate [(C17H35COO)2Mg], can be used as a chemical template for the formation of mesoporous alumina, and is a less expensive reagent than stearic
acid. Mesoporous alumina prepared using this cost-effective surfactant shows similar pore properties with respect to pore
size (3.5 nm) and surface area (above 300 m2Vg) to that prepared using stearic acid. In addition, textural porosity, arising from non-crystalline intraaggregate voids
and spaces, was effectively removed by the addition of magnesium nitrate. The entire transformation from aluminum hydroxide
to active alumina was performed at 550 °C, and the crystallinity of the product was confirmed by powder XRD analysis.27A1 MAS NMR result shows the phase of mesoporous alumina is the γ-alumina form. 相似文献
2.
Erik L. Gaskin Militza Carrero-Colón Karen A. Hudson 《Journal of the American Oil Chemists' Society》2021,98(2):221-226
Stearic acid is one of five major fatty acids found in soybean oil. It is a fully saturated lipid and is known for neutral or positive effects on LDL cholesterol when consumed by humans. Unfortunately, stearic acid only accounts for about 4% of the total seed oil produced in commodity soybean. Previous work has shown that stearic acid can reach levels as high as 28% of the total oil fraction when the SACPD-C gene, encoding the delta-9-stearoyl-acyl carrier protein desaturase responsible for most of the stearic acid variation in soybean seed, is ablated in combination with other loci. In order to increase stearic acid content and create soybeans with improved utility based on fatty acid composition, we combined mutations in SACPD-C with other mutations in the fatty acid biosynthetic pathway. Soybean plants carrying mutant alleles of both SACPD-C and FAD2-1A produce seed with stearic acid levels from 14% to 21%, and with elevated levels of oleic acid. Soybeans carrying mutations in both SACPD-C and FAD3A or FAD3C have both statistically significantly elevated levels of stearic acid (from 15–21%) and statistically reduced linolenic acid levels. Neither mutant combination appears to affect other agronomic properties such as plant morphology or seed protein levels making this a potentially viable trait. 相似文献
3.
采用硬脂酸对1500目重质碳酸钙进行湿法活化,利用正交实验研究了硬脂酸加入量、反应温度和反应时间对活化效果的影响。测定了改性前后重质碳酸钙活化度,并用红外光谱进行表征。 相似文献
4.
Xi Li Fabin Qiu Kui Guo Bo Zou Jianmin Gu Jing Wang Baokun Xu 《Materials Chemistry and Physics》1997,50(3):1105-232
Nanocrystalline Ba1−xSrxTiO3 (x=0, 0.2, 0.4, 0.6, 0.8 and 1.0) precursors were synthesized using the stearic acid gel method. After the precursors had been calcined at 600–950°C for 0.5–1 h, nanocrystalline powders with the cubic perovskite structure were obtained and these were made into thick films. The powder samples were characterized by differential thermal analysis, X-ray diffraction and transmission electron microscopy, and the thick film samples were characterized by scanning electron microscopy and X-ray diffraction. The humidity-sensitive properties of the nanocrystalline Ba1−xSrxTiO3 thick films were investigated. The results show that these nanocrystalline thick films possess higher humidity sensitivity and lower resistance than those of conventional materials. 相似文献
5.
Alain R. Atangana Erik van der Vlis Damase P. Khasa Dennis van Houten Jean Beaulieu Harrie Hendrickx 《Food chemistry》2011
We determined whether Allanblackia floribunda, a forest tree species that is valued for the fat extracted from its seeds, could be genetically improved for fruit/seed production by sampling 17–40 fruits from each of 70 trees that were distributed among four sites in wild stands. Fat was extracted from the seeds, and stearic and oleic acid content of the fat was estimated. Highly significant (P < 0.0001) between- and within-tree variation characterised fruits and seed characters. Between-site phenotypic variation was not significant. Stearic and oleic acid percentages in seed fat ranged from 44.16% to 66.12%, and from 24.95% to 48.42% per tree sample, respectively. Moderate repeatabilities were identified in fruit characters and mean seed mass. Moderate positive relationships were found between stearic and oleic acid percentages. Seed fat profiles were not found to vary with other fruit characters. Twenty “plus trees” were selected for breeding. 相似文献
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9.
LiFePO4/carbon composite was synthesized at 600 °C for 4 h in an Ar atmosphere by a stearic acid assisted rheological phase method using amorphous nano-FePO4 as the iron source. XRD, SEM and TEM observations show that the LiFePO4/carbon composite has good crystallinity, ultrafine and well-dispersed particles of 60–150 nm size and in situ carbon coated on the surface of LiFePO4 crystallites. The synthesized LiFePO4/carbon composite shows a high discharge capacity of 160 mAh g−1 and 155 mAh g−1 at rates of 0.5 C and 1 C, respectively. Even at a high current density of 30 C, the material still presents a discharge capacity of 93 mAh g−1 and exhibits an excellent cycling performance. 相似文献
10.
Seong Min Cho Hyeon Yong Lee Jin-Chul Kim 《Journal of the American Oil Chemists' Society》2007,84(9):859-863
Lipid nanoparticles containing hinokitiol (HKL) were prepared by a melt–emulsification method. Stearic acid was used as a
lipid for the matrix material of the nanoparticles. According to results from transmission electron microscopy (TEM) and dynamic
light scattering (DLS), most of the nanoparticles were less than 100 nm. When nanoparticles containing HKL were scanned on
a differential scanning calorimeter, no endothermic peak of HKL was observed. This means that HKL in the lipid matrix of the
nanoparticles is in a dissolved state. In an 18-h permeation study using hairless mouse skin mounted on a diffusion cell,
the amount of HKL encapsulated in the nanoparticles transported to the receptor cell was five to ten times more than for HKL
dissolved either ethanol or propylene glycol. Therefore, stearic acid nanoparticles strongly enhanced permeation of the skin
by HKL. 相似文献