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21.
Tuning the hydrophobic properties of silica particles by surface silanization using mixed self-assembled monolayers 总被引:1,自引:0,他引:1
Here we describe a novel method of preparing hydrophobic silica particles (100-150 nm; water contact angle of dropcasted film ranging from 60 degrees to 168 degrees) by surface functionalization using different alkyltrichlorosilanes. During their preparation, the molecular surface roughness is also concurrently engineered facilitating a change in both the surface chemical composition and the geometrical microstructure to generate hierarchical structures. The water contact angle has been measured on drop-cast film surface. The enhancement in the water contact angle on 3D (curved) SAMs in comparison to that on 2D (planar) surface is discussed using the Cassie-Baxter equation. These silica particles can be utilized for many potential applications including selective adsorbents and catalysts, chromatographic supports and separators in microfluidic devices. 相似文献
22.
Lakavath S Avula B Wang YH Rumalla CS Gandhe S Venkatrao AR Satishchandra PA Bobbala RK Khan IA Narasimha AR 《Journal of AOAC International》2012,95(1):67-73
Dikamali is a gum resin obtained from the leaf buds of Gardenia lucida or G. gummifera. There is controversy regarding the botanical source of this gum resin with some stating it to be from G. lucida while others claim it to be from G. gummifera. Analytical methods including UPLC and HPTLC were developed for the qualitative analysis of Gardenia species and various commercial samples. The separation using a UPLC method was achieved within 12.0 min by using C18 column material, a water/acetonitrile mobile phase, both containing formic acid, a gradient system, and a temperature of 40 degrees C. Extensive studies of dikamali collected from various parts of India in comparison with the gum resins collected from G. lucida and G. gummifera clearly indicated that the botanical source of commercially available dikamali is G. lucida, not G. gummifera. The marker compounds isolated from a market sample of dikamali were present only in the gum resin of G. lucida and the compounds isolated from G. gummifera were not present in any of the dikamali samples, confirming the botanical source of dikamali. This work is of utmost importance, given the ambiguity regarding the botanical source of the gum resin dikamali. LC/MS coupled with electrospray ionization is described for the identification and confirmation of nine compounds from various samples of the gum resin. An HPTLC method was also developed for the fast chemical fingerprint analysis of Gardenia samples. 相似文献
23.
Sonia Kale Anup Kale Haribhau Gholap Abhimanyu Rana Rama Desai Arun Banpurkar Satishchandra Ogale Padma Shastry 《Journal of nanoparticle research》2012,14(3):732
In the present study, we report a quantum dot (QD)-tailored western blot analysis for a sensitive, rapid and flexible detection
of the nuclear and cytoplasmic proteins. Highly luminescent CdTe and (CdTe)ZnS QDs are synthesized by aqueous method. High
resolution transmission electron microscopy, Raman spectroscopy, fourier transform infrared spectroscopy, fluorescence spectroscopy
and X-ray diffraction are used to characterize the properties of the quantum dots. The QDs are functionalized with antibodies
of prostate apoptosis response-4 (Par-4), poly(ADP-ribose) polymerases and β actin to specifically bind with the proteins
localized in the nucleus and cytoplasm of the cells, respectively. The QD-conjugated antibodies are used to overcome the limitations
of conventional western blot technique. The sensitivity and rapidity of protein detection in QD-based approach is very high,
with detection limits up to 10 pg of protein. In addition, these labels provide the capability of enhanced identification
and localization of marker proteins in intact cells by confocal laser scanning microscopy. 相似文献
24.
Deodatta Phase Ram Janay Choudhary V. Ganesan V. Raghvendra Reddy Ajay Gupta N. Selvi Sneha Kulkarni Satishchandra Ogale 《Solid State Communications》2009,149(7-8):277-280
Dense nanodonut and nanotip type morphologies are shown to self-evolve in ultrathin cobalt films during growth under vacuum, depending on the level of oxygen incorporation and temperature. The nanodonut morphology forms at room temperature and the corresponding magnetic hysteresis shows exchange bias (~35 Oe shift along the field axis), which is attributed to the presence of CoO and its exchange coupling with cobalt. The morphology evolves into nanotip features with increase of growth temperature, with concurrent elimination of the oxide component and exchange bias. 相似文献
25.
S. B. Ogale Y. V. Bhandarkar P. P. Patil S. M. Kanetkar V. G. Bhide 《Hyperfine Interactions》1986,27(1-4):289-292
Structural relaxations and diffusive transport near the surface of Fe67Co18B14Si1 metglass have been studied by means of conversion electron Mössbauer spectroscopy [CEMS]. It is shown that the relaxations occurring near the surface of the metglass consequent on thermal treatment exhibit distinctly different features as compared to those in the bulk. The difference in the thermally induced atomic transport near the surface region of the metglass and, that at the interface between the metglass and a deposited overlayer of iron has also been investigated. 相似文献
26.
S. V. Ghaisas K. Santosh George S. M. Chaudhari S. B. Ogale D. M. Phase V. G. Bhide 《Hyperfine Interactions》1987,35(1-4):663-666
The high temperature oxidation behavior of Fe50Ni50 alloy foils implanted with 100 KeV N2 + ions at a different dose values is studied by using the technique of conversion electron Mössbauer spectroscopy (CEMS). It has been shown that the implanted foils exhibit considerable adherence of scales and higher oxidation resistance as compared to the virgin foils. This excessive adherence of scales to the surface and higher resistance to oxidation of implanted samples is attributed to nickel enrichment in the surface layers. Various oxides of Fe, Ni and Fe?Ni are identified from the hyperfine interaction parameters of the corresponding CEMS spectra and also from x-ray diffraction measurements. 相似文献
27.
S. B. Ogale D. M. Phase P. P. Patil S. M. Kanetkar S. V. Ghaisas V. G. Bhide S. K. Date 《Hyperfine Interactions》1986,29(1-4):1193-1196
The effect of ion beam induced atomic mixing and subsequent thermal transformations at the Fe:Al2O3 interface have been investigated by means of conversion electron Mössbauer spectroscopy [CEMS]. It is shown that the asdeposited and ion beam mixed samples exhibit distinctly different features. In particular, the ion beam mixed sample in as-mixed state shows the presence of FeAl2O4 along with non-stoichiometric FeO. Upon annealing at 600°C it shows precipitation of α-Fe with reduced contribution of FeAl2O4. The study of dose dependence of ion beam mixing has also revealed interesting features regarding the ion beam induced interface reactions. 相似文献
28.
Bhosale R Hyam R Dhanya P Ogale S 《Dalton transactions (Cambridge, England : 2003)》2011,40(43):11374-11377
Rutile TiO(2) nanoneedles (8 nm × 100 nm) synthesized at room temperature by anodization in perchloric acid (pH < 1) are shown to undergo an interesting reverse phase transformation to anatase nanoparticles (8 nm) at 300 °C only if the chlorate ions are maintained in the ambient medium. When chlorate ions are removed by multiple washing, the rutile phase and the needle morphology are maintained. The mechanism of formation of the ion-stabilized solid and its thermal evolution is discussed. 相似文献
29.
The flow-induced microstructure of a mesophase pitch was studied within custom-made dies for changing wall shear rates from
20 to 1,100 s − 1, a flow scenario that is typically encountered during fiber spinning. The apparent viscosity values, measured at the nominal
wall shear rates ranging from 500 to 2,500 s − 1 using these dies, remain fairly constant. The microstructure was studied in two orthogonal sections: r–θ (cross section) and r–z (longitudinal mid plane). In these dies, the size of the microstructure gradually decreases toward the wall (to as low as
a few micrometers), where shear rate is highest. Furthermore, as observed in the r–θ plane of the capillary, for a significant fraction of the cross section, discotic mesophase has a radial orientation. Thus,
the directors of disc-like molecules were aligned in the vorticity (θ) direction. As confirmed from the microstructure in the r–z plane, most of the discotic molecules remain nominally in the flow plane. Orientation of the pitch molecules in the shear
flow conditions is consistent with that observed in controlled low-shear rheometric experiments reported earlier. Microstructral
investigation suggests that the radial orientation of carbon fibers obtained from a mesophase pitch originates during flow
of pitch through the die. 相似文献
30.
V. G. Dedgaonkar N. B. Chabria S. B. Ogale 《Journal of Radioanalytical and Nuclear Chemistry》1992,166(4):351-357
The effect of Ar+-ion implantation (energy 100 keV) has been studied on ferrocene pellets at 1×1014 and 5×1014 ions/cm2 doses. The characterization techniques used were infrared spectroscopy, small-angle X-ray diffraction and bulk X-ray diffraction. At the lower dose, formation of a metastable alkene occurred; at the higher dose a metastable alkane was formed. The X-ray data showed that metastable phases like Fe–C, (Fe–C)H and carbon phases were produced at the surface. Not being observable on the surface, the organic counterparts are expected to be volatile in nature. When treated with varying energy doses, ferrocene showed bulk damage; the IR spectra showed the loss of fine structure and only a single peak persisted, which was due to metal-ring vibration. 相似文献