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排序方式: 共有141条查询结果,搜索用时 187 毫秒
91.
Jaroslav M. Katona Verica J. Sovilj Lidija B. Petrović Jadranka L. Milanović 《Journal of Dispersion Science and Technology》2013,34(12):1679-1684
A novel method for microencapsulation of oil by coacervation is presented. The method employs segregative phase separation between sodium carboxymethyl cellulose (NaCMC) and a complex of hydroxypropylmethyl cellulose (HPMC) and sodium dodecylsulfate (SDS), which results in coacervate formation. Microstructural properties of the coacervate can be varied by tuning NaCMC-HPMC/SDS interaction, which is achieved by changing SDS concentration. Microcapsules preparation route is presented. Encapsulation efficiency and dispersion properties of microcapsules with coacervate shell of different properties and different oil content were tested. Microcapsules with smallest droplet size, the narrowest droplet size distribution, and with lowest extractability of encapsulated oil were obtained when NaCMC-HPMC/SDS interaction results in formation of the most compact coacervate shell, no matter of the encapsulated oil. 相似文献
92.
Lablanquie P Huttula SM Huttula M Andric L Palaudoux J Eland JH Hikosaka Y Shigemasa E Ito K Penent F 《Physical chemistry chemical physics : PCCP》2011,13(41):18355-18364
Auger decay of an inner shell hole is an efficient way to create multiply charged ions in the gas phase. We illustrate this with the example of the argon 2s decay, and show that multi-electron coincidence spectroscopy between the 2s photoelectron and all released Auger electrons leads to a complete reconstruction of the Ar 2s decay cascade. Spectra of the intermediate and final Ar(n+) states are obtained and are compared with a theoretical model. 相似文献
93.
Paula M. Jardim Lidija Mancic Bojan A. Marinkovic Olivera Milosevic Fernando Rizzo 《Central European Journal of Chemistry》2011,9(3):415-421
Nax−yHyTi2−xFexO4·nH2O nanosheets with lepidocrocite-like layered structure were produced through alkaline hydrothermal treatment at very low temperatures
(130°C) from ilmenite sand. The crystal structure, morphology and optical properties were investigated by X-Ray diffraction,
transmission electron microscopy, selected area electron diffraction, energy dispersive spectroscopy and UV-Vis spectroscopy.
The product shows leaf-like nanosheet morphology with thickness <30 nm and lengths <1 μm. Three lepidocrocite-like titanates
(Imm2 space group) with similar a and c lattice parameters but different interlayer distances (b/2) were identified. This
appears to be the first preparation of lepidocrocite-like layered nanosheets by a simple, energy efficient (low temperature)
and low cost (starting from mineral sand) procedure. 相似文献
94.
Mioara Drobota Zdenka Persin Lidija Fras Zemljic Tamiselvan Mohan Karin Stana-Kleinschek Ales Doliska Matej Bracic Volker Ribitsch Valeria Harabagiu Sergiu Coseri 《Central European Journal of Chemistry》2013,11(11):1786-1798
The functionalization of poly(ethylene terephthalate) (PET) surface films by reactions with multifunctional amines such as triethylenetetramine (TETA), and tetraethylenepentamine (TEPA) was investigated. For the functionalization of PET films surface we used a new way of treatment, a “sandwich model”. Physical-chemical properties of functionalized PET films were analysed. Qualitative and quantitative determination of the introduced amine groups were examined by means of Fourier Transform Infrared Attenuated Total Reflexion (FTIR — ATR), X-ray photoelectron spectroscopy (XPS), and potentiometric titration. Gained wetting properties were determined by using contact angle measurements and thoroughly analysed by acid-base approach. In addition, surface topography was investigated by atomic force microscopy (AFM). The amount of the introduced amino groups after TETA incorporation has been found to be two times higher as compared to TEPA. Wetting properties were significantly improved after aminolysis. Surface free energy was higher for PET — TETA treated film than that observed for PET — TEPA treated which is in accordance with titration results. The collagen immobilization onto PET treated films was evidenced by using AFM and subsequently by using XPS. 相似文献
95.
Barbara Simončič Samira Hadžić Jelena Vasiljević Lidija Černe Brigita Tomšič Ivan Jerman Boris Orel Jožef Medved 《Cellulose (London, England)》2014,21(1):595-605
This research aimed to create multifunctional cellulose fibres with water- and oil-repellent, self-cleaning, and flame retardant properties. A sol mixture of fluoroalkyl-functional siloxane, organophosphonate and methylol melamine resin was applied to cotton fabric by the pad-dry-cure method. Successful coating was verified by atomic force microscopy and Fourier transform infrared spectroscopy. The functional properties of the coated fibres were investigated using the static contact angles of water and n-hexadecane, the water sliding angles, the vertical test of flammability, the limiting oxygen index, and simultaneous thermal analysis. The results reveal that a homogeneous composite inorganic–organic polymer film formed on the cotton fabric surface exhibited the following properties: static contact angle of water of 150° and of n-hexadecane of 128°, water sliding angle of 10°, limiting oxygen index of 34 %, and high thermal stability. These results demonstrate the synergistic activity of the compounds in the coating, which resulted in the creation of a “lotus effect” on the fabric surface as well as excellent flame retardancy and thermal stability. 相似文献
96.
Jelena Dodić Jovana Grahovac Nataša Kalajdžija Strahinja Kovačević Lidija Jevrić Sanja Podunavac Kuzmanović 《Applied biochemistry and biotechnology》2014,174(2):534-541
The nutritional requirements for antimicrobial agent production using Streptomyces hygroscopicus were analyzed in shake flask experiments. Antimicrobial activity was tested against Staphylococcus aureus and Bacillus cereus. The mathematical models have been generated with relative high complexity in order to give an adequate fit to the data. All the results suggest a high dependence of produced antimicrobial agent quantities on the amount of carbon, nitrogen, and phosphorus in cultivation medium. The statistical results of the generated models reflect the high predictive ability. The derived models were validated using leave-one-out cross-validation technique, and from statistical point of view, they have significantly high values of the cross-validation parameters. 相似文献
97.
Dunja Šamec Jiri Gruz Ksenija Durgo Dario Kremer Ivan Kosalec Lidija Valek Žulj 《Natural product research》2015,29(18):1770-1774
Phytochemical composition and antioxidant activity of three wild populations of endemic Illyric-Balcanic species Micromeria croatica (Pers.) Schott have been evaluated with respect to plant organ and growing location. Multivariate analysis (principal component analysis) was performed to visualise (dis-)similarity among samples and identify the correlations between phytochemical variables that explain the most variability. The tested leaf extract from Ba?i? kuk locality exhibited protective effects against reactive oxygen species-induced damage of DNA and inhibition of lipid peroxidation, while it caused oxidative degradation of protein in the bovine serum albumin assay at higher concentrations. This extract also exhibited cytotoxic activity and facilitated the formation of reactive oxygen species in the HEp2 cell line, in a dose-dependent manner. 相似文献
98.
Hermann Fuhrer Grety Rihs Ljubinka Lorenc Lidija Bondarenko Jaroslav Kalvoda Mihailo Lj. Mihailovi 《Helvetica chimica acta》1987,70(1):37-42
The thermolysis of the steroidal 5α,8β-peroxide 1 , under acidic conditions afforded in addition to the expected 5,10:8,9-diseco derivative 2 , the rearranged 5α,8β-epoxide 3 , the structure of which was determined by NMR spectroscopy and X-ray analysis. 相似文献
99.
Tomislav J. Janjić Lidija B. Pfendt Mirjana B. Pasulj 《Monatshefte für Chemie / Chemical Monthly》1984,115(6-7):705-711
Two-phase buffer systems consisting of a sparingly soluble diprotic acid and its saturated aqueous solution (buffered phase) are investigated. The equations for the dependence of buffer capacity onpH and for evaluation of dilution effects in two-phase buffers of this type are derived. Theoretical considerations are experimentally verified on four buffer systems containing 1,2-, 1,3-, 1,4-benzenedicarboxylic and octanedioic acid. The main characteristic of the buffers of this type is a very high buffer capacity within a narrowpH range.
Zweiphasen-Puffersysteme mit einer schwerlöslichen diprotischen Säure als feste Phase
Zusammenfassung Zweiphasen-Puffersysteme, bestehend aus einer schwerlöslichen diprotischen Säure und ihrer gesättigten wäßrigen Lösung (gepufferte Phase), wurden untersucht. Die Gleichungen für die Abhängigkeit der Pufferkapazität vompH und für die Berechnung der Verdünnungseffekte in derartigen Zweiphasen-Puffersystemen wurden aufgestellt. Dabei wurden die theoretischen Betrachtungen an vier Puffersystemen, die Benzol-1,2-, -1,3- und-1,4-dikarbonsäuren bzw. Oktandisäure enthielten, experimentell geprüft. Die wichtigste Eigenschaft solcher Puffer ist ihre sehr hohe Pufferkapazität innerhalb eines engenpH-Bereiches.相似文献
100.
Lerman L Cempuh Klonkay A Elenkov I 《European journal of mass spectrometry (Chichester, England)》2004,10(4):523-539
Aryl-substituted 4-hydroxycoumarins (1-57) were investigated by electrospray ionisation (ESI) mass spectrometry. Their fragmentation in the ion source or in the collision cell of a triple quadrupole mass spectrometer was investigated. The effect of the substituents in the aromatic ring on the fragmentation of the 4-hydroxycoumarin derivatives is shown. The influence of the tautomerism on the formation of quasimolecular ions and mass spectral fragmentation was explained. Mass spectral studies on some deuterated compounds proved some of the proposed fragmentation pathways. Results obtained are very useful in the process of detection and characterisation of 4-hydroxycoumarins, as well as for structural elucidation of their more complex derivatives. 相似文献