Small-angle neutron scattering contrast variation on magnetite-myristic acid-benzene magnetic fluid
Artem FeoktystovМ. В. АвдеевВ. Л. АксеновЛ. А. БулавинD. BicaL. VékásVasil M. GaramusRegine Willumeit‐Römer
7
Citation
4
Reference
10
Related Paper
Citation Trend
Keywords:
Myristic acid
Photoelectric charging experiments monitor the uptake of pyrene onto NaCl aerosol particles coated with either oleic acid or myristic acid. In both cases, thin coatings produce a small net decrease in pyrene uptake. In the larger coverage limit, the uptake of the myristic acid coated particles remains nearly constant whereas the oleic acid coated particles exhibit greater uptake rates than the bare NaCl particles. Fitting the results with a multilayer kinetic model yields uptake rate coefficients as well as parameters that describe the distribution of organic molecules on the aerosol particle surface. The model accounts for the decrease in uptake associated with thin coatings of oleic acid through a concomitant reduction in surface area. The adsorption rate constants for the myristic and oleic acid coated surfaces are 50 and 80 times faster, respectively, than for NaCl. The desorption rates for pyrene on the fatty acid surfaces are faster, as well. For myristic acid coatings, the fast desorption (over 400 times the rate of desorption from NaCl) results in slower net adsorption, whereas for oleic acid (approximately 12 times the desorption rate from NaCl), the net uptake rate increases with coverage. The results also suggest that both myristic acid and oleic acid spread incompletely on the aerosol surfaces under the conditions of these experiments. In the optimized kinetic model, the fatty acids cover approximately 50% of the surface when the nominal coating thickness is approximately 6 nm. The surface is over 90% covered with a nominal coating thickness of 20 nm, which is approximately 10% of particle diameter in these experiments. Very thin oleic acid coatings reduce the surface area of particles consistent with the preferential coverage of highly corrugated or porous regions.
Myristic acid
Particle (ecology)
Stearic acid
Cite
Citations (4)
Analysis of fatty acid contents and pharmacological properties of Pliek U oil was performed. Fatty acids were analyzed by gas chromatography-mass spectrometry (GC-MS), and pharmacological properties based on its potential on filament-aggregating protein (filaggrin) were studied with bioinformatics approach by the reverse docking technique using palmitic acid as a control compound. Two Pliek U extracts, namely, Pliek U oil (PUO) and ethanolic Pliek U oil extract (EPUOE), were prepared. The GC-MS results revealed that lauric acid, myristic acid, palmitic acid, and oleic acid are the predominant fatty acids, with lauric acid being the abundant one in all Pliek U oil extracts. The reverse docking technique results showed that oleic acid had the most stable interaction to filaggrin with the lowest binding affinity (-6.1 kcal/mol). Oleic acid and palmitic acid have one same side binding to filaggrin on amino acid LEU D75. These findings indicated that oleic acid has the best potential to be used as a drug candidate in atopic dermatitis treatment.
Myristic acid
Fumaric acid
Sunflower oil
Cite
Citations (46)
Among the various techniques developed to characterize the structure of polymer blends, Small Angle Neutron Scattering (SANS) has received considerable attention over the past few years. By using SANS it is possible to determine the conformation of the polymer chain as well as the interaction parameter between the components of the blend.
Characterization
Biological small-angle scattering
Small-Angle Scattering
Cite
Citations (0)
The oleic acid ozonolysis in mixed oleic and myristic acid particles was studied in a flow tube reactor using single particle mass spectrometry. The change in reactivity was investigated as a function of the myristic acid concentration in these 2 micron particles. For pure oleic acid aerosol, the reactive ozone uptake coefficient, γ, was found to be 3.4 (±0.3) × 10−4 after taking secondary reactions into account. At the myristic acid crystallization point, where only 2.5% of the particle is in the solid phase, the uptake coefficient was reduced to 9.7 (±1.0) × 10−5. This dramatic drop in the uptake coefficient is explained by the presence of a crystalline monolayer of myristic acid, through which ozone diffusion is reduced by several orders of magnitude, relative to liquid oleic acid. Scanning electron microscope images of the mixed particles confirm that the particle surface is crystalline when the myristic acid mole fraction exceeds 0.125. The findings of these experiments illustrate that particle morphology is important to understanding the reactivity of species in a mixed particle. The decay of myristic acid during the course of ozonolysis is explained in terms of a reaction with stabilized Criegee intermediates, which attack the acidic groups of the oleic and myristic acids with equal rate constants.
Myristic acid
Particle (ecology)
Reactivity
Cite
Citations (38)
هدفت الدراسة إلى إستغلال عظام الأبقار والأغنام والدجاج بنوعيها (المجوف والمسطح) في إنتاج الدهن، أذ أظهرت النتائج زيادة طردية في نسب الأستخلاص مع زيادة درجة الحرارة والمدة الزمنية للأستخلاص بالنسبة لعظام الأبقار المجوفة والمسطحة وعظام الأغنام المجوفة والمسطحة وقد سجلت أقل نسب استخلاص في درجة حرارة 60 م بعد ثلاث ساعات 12.66 ,6.55 6.93 ,7% على التوالي، بينما أعلى نسبة استخلاص لعظام الأبقار المجوفة في درجة حرارة أستخلاص 90 م بعد خمس ساعات وبلغت 21.90%، في حين أعلى نسبة أستخلاص في عظام الأبقار المسطحة وعظام الأغنام المجوفة والمسطحة في درجة حرارة 100م وبعد خمسة ساعات بلغت 15.04 ,16.4 ,12.8% على التوالي, أما عظام الدجاج المجوفة والمسطحة فقد اقتصرت درجة المعاملة الحرارية على90 م، وأظهرت زيادة طردية مع زيادة المدة الزمنية للأستخلاص وبلغت نسبة الدهن بعد ثلاثة ساعات استخلاص 1.10، 1.08% على التوالي، وبعد أربع ساعات استخلاص 1.17, 1.12% على التوالي، وباستعمال جهاز كروموتواكرافي الغاز السائلGLC لدهن العظام فتبين محتوى الدهن من الأحماض الدهنية السائدة وهي كما يلي حسب نسب تواجدها في دهن عظام الأبقار المجوفة acid Oleic, Palmitic acid, Stearic acid, Palmitoleic acid, Linoleic acid, Myristic acid على التوالي، في حين كان في دهن عظام الأبقار المسطحة وحسب نسب تواجدها كما يأتيacid Oleic، acid Palmitic، Stearic acid، Palmitoleic acid، Myristic acid، Linoleic acid على التوالي، وأن تسلسل الأحماض الدهنية حسب نسب تواجدها في دهن العظام الأغنام المجوفة كان Oleic Acid، Palmitic Acid، Stearic Acid، Palmitoleic Acid، Linoleic Acid، Myristic Acidعلى التوالي، وفي دهن العظام الأغنام المسطحة كما يلي Oleic Acid، Palmitic Acid، Stearic Acid،Myristic Acid، Palmitoleic Acid، Linoleic Acid على التوالي، أما في دهن العظام الدجاج المجوفة كمايلي Oleic Acid، Palmitic Acid، Linoleic Acid، Palmitoleic Acid، Stearic Acid، Myristic Acid على التوالي وفي دهن العظام المسطحة Oleic Acid، Linoleic Acid، Palmitic Acid، Stearic Acid، Palmitoleic Acid، Alpha Linolenic Acid، Myristic Acid على التوالي، كما أن عظام الدجاج المسطح تفرد باحتواءه على α- Linolenic Acid.
Stearic acid
Myristic acid
Palmitoleic acid
Linolenic acid
Cite
Citations (0)
Small-Angle Scattering
Spinodal decomposition
Small-angle X-ray scattering
Cite
Citations (203)
In Drosophila melanogaster the saturated fatty acids increase in amount early in pupal development relative to the concentrations in late third instar larvae, then decline to the levels characteristic of one-day-old adults. Conversely, the monounsaturated fatty acids decline in content early in pupal development, then increase late in the pupal period.Lauric acid (12: 0), myristic acid (14: 0) and palmitoleic acid (16: 1) become more prominent and oleic acid (18: 1) and palmitic acid (16:0) less prominent as the adult ages. At about 40 days of adult age myristic acid (14:0) begins to decrease and oleic acid (18: 1) to increase. Within 20 days of eclosion males and females contain different amounts of myristic acid (14: 0), palmitic acid (16:0) and oleic acid (18: 1).
Myristic acid
Palmitoleic acid
Cite
Citations (14)
Neutron scattering techniques have been used frequently to characterize geological specimens and to determine the structures of glasses and of polymers as solutions, suspensions, or melts. Little work has been reported on their application in determining polymers' structural properties relevant to separations. Here, we present a comparison of characterization results from nitrogen porosimetry and from combined small angle neutron scattering (SANS) and ultrasmall angle neutron scattering (USANS) experiments. We show that SANS is extremely sensitive to the pore characteristics. Both approaches can provide information about porosity and pore characteristics, but the neutron scattering techniques provide additional information in the form of the surface characteristics of the pores and their length scales. Fits of the scattering data show that cylindrical pores are present with diameters down to 0.6 μm and that, for length scales down to approxmately 20 Å, the material shows self-similar (fractal) slopes of −3.4 to −3.6. Comparison of these characteristics with other examples from the scattering literature indicate that further investigation of their meaning for chromatographic media is required.
Characterization
Small-Angle Scattering
Neutron reflectometry
Biological small-angle scattering
Cite
Citations (14)
축산 폐유지로부터 원료유의 추출 수율을 높이고, 동시에 수분을 제거하면서 원료유로부터 육분잔사를 용이하게 분리하고자 파일럿 규모(300L)에서 고온 용융추출과 볶음추출 및 동시 수분회수 방법을 수행한 결과 다음과 같다.BR (1) 고온 용융추출(100～140℃, 0.10Mpa, 2～3hr)과 볶음추출(70～100℃, -0.09MPa, 60 min) 및 동시 수분회수 결과, 추출탱크의 온도가 110～140℃에서 기름추출 수율이 65% 이상으로 높게 나타났고, 육분 잔사의 발생량은 추출탱크의 온도가 높아질수록 감소하는 경향을 보였다. 원료유의 추출 및 육분잔사를 활용하기 위하여 열처리단계에서 공급되는 에너지 소비를 고려할 경우 열처리 온도 120℃가 적합한 것을 확인 하였다.BR (2) 고온 용융추출 후 볶음추출 단계를 연속적으로 수행한 결과 육분잔사가 슬러리 형태에서 알갱이 형태로 변하여 기름분리가 매우 수월하였다.BR (3) 추출 탱크의 온도 변화는 기름 추출 수율과 통계적으로 유의적인 차이를 보이지는 못했으나 증가하는 값을 보였다. 기름 추출 수율은 육분잔사(r=-0.843)와의 유의적인 부의 상관관계를 보였다.BR (4) 동물성 기름의 주요 지방산은 Myristic acid, palmitic acid, palmitoleic acid, stearic acid, oleic acid, linoleic acid의로 구성 되어 있었으며, 포화지방산인 palmitic acid는 최고 28.9%에서 최저 23.5%를 나타내어 유의적인 차이를 나타내었고, 불포화지방산 중 단일불포화지방산인 oleic acid은 최고 51.7%에서 최저 41.6%로 10% 이상의 차이를 보여 유의적인 차이가 인정되었다.BR (5) 동물성 기름의 지방산간의 상관분석을 통해 상관관계를 구명한 바 바이오디젤을 생산하여 계절변화에 따른 이용가치 증대를 위하여 주요 구성 지방산 중 특히 단일불포화지방산인 oleic acid를 증가시키고, 포화지방산을 적정함량 감소시키는 방향으로 연구를 집중한다면 바이오디젤 연료의 주요 품질기준인 산화안정적인 측면과 저온에서 굳어버리는 유동성의 단점을 개선할 수 있을 것으로 예상된다.BR (6) 파일럿 규모에서 추출한 동물성 기름은 산가 1.7±0.22～2.9±0.75, 수분 0.2%, 산화안정성 0.5 hr로 분석되었다.
Palmitoleic acid
Stearic acid
Myristic acid
Cite
Citations (0)
Small-Angle Scattering
Small-angle X-ray scattering
Cite
Citations (6)