- Cation Distribution Assisted Tuning of Magnetization in Nanosized Magnesium Ferrite
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The MgFe2O4 nanoparticles are synthesized by combustion method and annealed at different temperatures from 500 to 1000 °C. Magnetic properties, morphology, valence states of iron, crystal structure, and microstructure of the samples
- Thanh, Nguyen Kim,Loan, To Thanh,Duong, Nguyen Phuc,Anh, Luong Ngoc,Nguyet, Dao Thi Thuy,Nam, Nguyen Huu,Soontaranon, Siriwat,Klysubun, Wantana,Hien, Than Duc
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- Adsorption of Anions of Higher Carboxylic Acids on Magnesium from Weakly Alkaline Aqueous Solutions
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Abstract: The adsorption of sodium salts of higher carboxylates on oxidized magnesium is studied via in situ reflective ellipsometry. It is shown that the free energies of adsorption of sodium oleyl sarcosinate (OsS) and sodium linoleate (LiS) is >55 kJ/mol, indicating the chemisorption of carboxylates on oxidized magnesium surfaces. Electrochemical impedance spectra, voltammetry, and corrosion testing show that sodium oleate (OlS) has the best protective properties on pure and oxidized magnesium. The strong protective properties of OlS are confirmed by Mg plate testing under conditions of a wet atmosphere with daily condensation. Tentative passivation of chemically oxidized Mg in a 16 mmol/L OlS solution protects against corrosion for 92–96 h.
- Andreeva, N. P.,Chirkunov, A. A.,Kuznetsov, Yu. I.,Luchkin, A. Yu.,Ogorodnikova, V. A.
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p. 1104 - 1110
(2020/06/08)
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- Continuous preparation method of metal fatty acid salt
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The invention relates to a continuous preparation method of metal fatty acid salt. The continuous preparation method of the metal fatty acid salt comprises the step of continuously enabling fatty acidand metal hydroxides to react in a solvent and prepare the metal fatty acid salt in a microchannel reactor or pipeline reactor. The preparation method disclosed by the invention can control the particle diameter of a product material to be within 70nm and 1000nm, and the particle diameter of the product material can be adjusted as needed; the metal fatty acid salt is simple in preparation method,short in technological process, few in three wastes (waste water, waste residues and waste gas), beneficial to environmental protection and suitable for industrial production; the reactor used in theinvention has short reaction time, high safety, high efficiency and large productivity, and can realize continuous production, furthermore, the space utilization rate of workshops is high, and mass production can be realized; by adopting the preparation method disclosed by the invention, the solvent can be recycled to lower the production cost; and the preparation method has high conversion rateof raw materials, stable quality and high purity.
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Paragraph 0076; 0077; 0078; 0079
(2019/04/04)
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- Sodium stearate and continuous production process and production line thereof
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The invention discloses sodium stearate and a continuous production process and production line thereof. The production process includes: preparing materials: stearic acid, tablet sodium hydroxide and a catalyst; closing a channel valve, adding the materials from a feed port, mixing well the materials, and charging a mixture into a reaction cylinder through the channel valve; closing the channel valve of the reaction cylinder, keeping a certain level of pressure in the reaction cylinder, and heating to obtain a semi-finished product; measuring pH value of the semi-finished product, starting a pressure regulator, and starting a heating device to distill water under reduced pressure; crushing the obtained dry sodium stearate into micro-particles, and automatically packaging to obtain the finished stearate; the continuous production line comprises a feeding cylinder, a reaction cylinder, a separating cylinder and a packaging unit that are connected in sequence. The continuous production process is used for the sodium stearate, the target product with high purity and quality is prepared, the requirement for batch continuous production is met, and production cost is further reduced.
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Paragraph 0040-0046
(2017/06/03)
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- CROSS-LINKED POLYALLYLAMINE TABLET CORE
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A method and a composition for making a composition, tablet, or tablet core having cross-linked polyallylamine salts such as sevelamer hydrochloride, sevelamer carbonate, or colesevelam hydrochloride, that may be used for treating hyperphosphatemia or reducing cholesterol. The method involves blending of a cross-linked polyallylamine salt with a water soluble excipient, optionally with water, an additive and/or a lubricant, and further tableting the resulting blend to form tablets and tablet cores.
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- Removal of alkyl alkanesulfonate esters from alkanesulfonic acids and other organic media
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Methods of removing alkyl alkanesulfonate esters from aqueous or anhydrous compositions are provided. The invention provides methods for the conversion of alkyl alkanesulfonate esters of the formula RSO3R′ to the corresponding acids of the formula RSO3H. The alkyl alkanesulfonate esters are present in an organic medium, which may contain significant amounts of water or which may be anhydrous or substantially anhydrous. In some embodiments, the invention provides methods for purifying aqueous or anhydrous alkanesulfonic acids by removing alkyl alkanesulfonate esters.
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Page/Page column 6
(2008/06/13)
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- Process for producing geranylgeraniol
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A process for producing geranylgeraniol is provided, which comprising the steps of subjecting a mixture of at least one ester derivative wherein one or more carbon-carbon double bonds in the molecule are in cis form represented by the general formula (1): STR1 wherein R represents an aromatic group which can be substituted with at least one substituent, or a higher aliphatic group having from 7 to 25 carbon atoms, and wavy lines, respectively, represent a state where each carbon-carbon double bond can be present in cis or trans form, and an ester derivative of the general formula (2): STR2 wherein R is as defined above, to crystallization to obtain the ester derivative of the formula (2) selectively, and hydrolyzing the thus obtained ester derivative.
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- Substituted acetophenones and compositions containing them
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Antivirally active compounds of the formula STR1 wherein R1 represents hydroxy, acyloxy derived from an aliphatic acid having 2-18 carbon atoms or a heterocyclic carboxylic acid containing nitrogen atom(s), lower alkoxycarbonyloxy, aminoacyloxy or carboxyalkanoyloxy; R2 represents lower alkoxy; R3 represents hydrogen or lower alkoxy; and R4 represents phenyl which may be substituted by one or more substituents selected from the group consisting of lower alkyl, lower alkoxy, benzyloxy, allyloxy, alkylthio, dialkylamino, amino, cyano, hydroxy, halo and alkylenedioxy; or pyridyl, furyl, thienyl or pyrrolyl which may be substituted by lower alkyl, pharmaceutical compositions containing them and a process for the preparation of those compounds of formula I which are novel.
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- Einfluss verschiedener Vorbehandlungen auf die Strukturbildung und thermischen Umwandlungserscheinungen ausgewaehlter Natrium-Seifen
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Das thermische Phasenverhalten und die strukturellen Abwandlungen ausgewaehlter Na-Seifen (Na-Kaprylat, Na-Palmitat und Na-Stearat) wurden mit den Methoden der Differential-Scanning-Kalorimetrie, Roentgen- und Elektronenbeugung untersucht.Der Einfluss verschiedener Vorbehandlungen auf die Struktur und thermischen Umwandlungserscheinungen stand im Mittelpunkt des Interesses.Folgende Ergebnisse sind hervorzuheben: 1.Verschiedene Vorbehandlungen (Probenpraeparationen) beeinflussen die Restwassermengen in den Na-Seifen.Zur Herstellung wasserfreier Produkte muss fest gebundenes Wasser (ca. 1/2 mol) unter drastischen Bedingungen entfernt werden. 2.Die Umwandlungstemperaturen und -enthalpien unterschiedlicher Formen obiger Na-Seifen werden angegeben und mit dem Wassergehalt in Beziehung gesetzt. 3.Mit Ausnahme des Kristalls laesst sich der feste Zustand verschieden vorbehandelter Seifen strukturell nicht einheitlich deuten.Die Grenzen bekannter Modellvorstellungen werden diskutiert. 4.Der Kristallzustand laesst sich nur durch Loesungsmittelkristallisation erreichen.Im Kristall sind die Molekuele (NaC18) in einem Gitter der Abmessungen a=9,19 Angstroem und b=8,05 Angstroem gepackt.Die trikline Subzelle TII als Anordnung der aliphatischen Ketten wurde durch Elektronenbeugung an Mikroeinkristallen gesichert.Als Ueberstrukturelemente koennen duenne lamellare Fasern angenommen werden.Eine periodische Anordnung derartiger Fasern ist nachgewiesen worden. 5.Aus den Roentgenbeugungsaufnahmen folgt, dass das Aufschmelzen der Ketten fuer das NaC8, NaC16 und NaC18 einheitlich bei etwa 118 deg C satttfindet und mit einer thermischen Kontraktion und einem Wechsel in der Ueberstruktur verbunden ist.Das Roentgenbeugungsverhalten beim Aufheizen verschiedener Zustaende der Seifen ist jeweils unterschiedlich und konnte nicht in allen Faellen strukturell gedeutet werden.Die Hochtemperaturphasen liessen sich nur beim wasserfreien NaC18 mit dem Modell zentrierter Baenderstrukturen in Uebereinstimmung bringen.
- Foerster, G.,Brezesinski, G.,Gerlach, E.,Maedicke, A.,Doerfler, H.-D.
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p. 1009 - 1031
(2007/10/02)
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