01538nas a2200229 4500008004100000022001400041245007300055210006900128260007300197300001200270490000800282520072400290653001501014653002401029653002801053653003901081100002301120700002401143700001801167700001901185856010401204 2007 eng d a0039-602800aBlocking effects in irreversible adsorption of linear macromolecules0 aBlocking effects in irreversible adsorption of linear macromolec aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcJAN a274-2790 v6013 a

{A new variant of random sequential adsorption (RSA), namely random sequential ballistic adsorption (RSBA), is proposed to explore the possible role of blocking effects in the adsorption dynamics of ballistically arriving objects. These objects upon adsorption can protrude outside the substrate and in turn can obstruct and hence reject the adsorption of newly arriving objects. Adsorption of linear macromolecules (modeled as infinitesimally thin needles), on a two-dimensional continuum substrate is studied using RSBA model. It is shown analytically that in late time regime, the number n(t) of adsorbed objects at time t follows a power law n(t) similar to t(alpha), as in RSA, but with a different exponent

10aAdsorption10aadsorption kinetics10aMonte Carlo simulations10arandom sequential adsorption (RSA)1 aShelke, Pradip, B.1 aBanpurkar, Arun, G.1 aOgale, S., B.1 aLimaye, A., V. uhttps://library.ncl.res.in/content/blocking-effects-irreversible-adsorption-linear-macromolecules-002573nas a2200229 4500008004100000022001400041245013200055210006900187260007300256300001400329490000800343520166100351653001502012653002402027653002802051653003902079100002302118700002402141700002902165700001902194856013002213 2007 eng d a0039-602800aImpact of orientational distribution of adsorbing objects on dynamics of Random Sequential Ballistic Adsorption (RSBA) dynamics0 aImpact of orientational distribution of adsorbing objects on dyn aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcNOV a5010-50150 v6013 a

Recently, by proposing a new variant of Random Sequential Adsorption (RSA) namely Random Sequential Ballistic Adsorption (RSBA) model [Pradip B. Shelke, A.G. Banpurkar, S.B. Ogale, A.V. Limaye, Surf. Sci. 601 (2007) 274], we addressed the issue of adsorption dynamics of extended objects where the objects, upon adsorption, protrude outside the substrate. This study brought out the role of the arriving trajectory in the adsorption dynamics. In the present work the possible role of the orientational distribution of the arriving objects in the RSBA dynamics is investigated. The dynamics of RSBA of needles (line segments) is studied analytically and by computer simulation for different types of theta distributions of arriving needles, theta being the angle made by the arriving needle with normal to the substrate. Three types of theta distributions, namely a uniform distribution over the range (0, pi/2), a Gaussian distribution and a distribution uniform over the solid angle, are considered. Analytical treatment establishes that in all the three cases, the number n(t) of adsorbed objects at a late time t follows a power law n(t) similar to t(alpha), and the exponent a depends on the specifics of the theta distribution. In general, for distribution f(theta) proportional to theta(beta), for theta -> 0, alpha is found to be 2/(beta + 3). The simulation results are in excellent agreement with the analytical findings and together they reveal that the orientational distribution of arriving objects has significant consequences for the Random Sequential Ballistic Adsorption (RSBA) process. (C) 2007 Elsevier B.V. All rights reserved.

10aAdsorption10aadsorption kinetics10aMonte Carlo simulations10arandom sequential adsorption (RSA)1 aShelke, Pradip, B.1 aBanpurkar, Arun, G.1 aOgale, Satishchandra, B.1 aLimaye, A., V. uhttps://library.ncl.res.in/content/impact-orientational-distribution-adsorbing-objects-dynamics-random-sequential-ballistic-002107nas a2200241 4500008004100000022001400041245009500055210006900150260007100219300001200290490000700302520123300309653002401542653002401566653002201590653001701612653003301629653001501662100001701677700002501694700001901719856012701738 2016 eng d a0091-403700aCrosslinked polymer embedded Cu/Ag for comparative drug adsorption and kinetics evaluation0 aCrosslinked polymer embedded CuAg for comparative drug adsorptio aKARL JOHANS GATE 5, NO-0154 OSLO, NORWAYbTAYLOR & FRANCIS AScJAN a285-2930 v653 a

Two-dimensional crosslinked polymer (2-DCP) was synthesized for evaluation of drug adsorption and kinetics thereof. Further, polymer properties were evaluated and parameters such as contact time and adsorption isotherm were also studied. Herein, contact time demonstrated 83% and 85% of drug loading in an acidic medium for two-dimensional crosslinked polymer embedded copper and silver (2-DCP-Cu/Ag), respectively in 24h. Initial 4h is the exponential drug loading period whereas drug loading was increased gradually after 4h. Salbutamol loading was well-fitted to Langmuir adsorption isotherm, which indicated a monolayer drug adsorption with respect to 2-DCP-Cu/Ag. Pseudo first- and pseudo second-order kinetics was evaluated to perceive the drug adsorption mechanism and equilibrium adsorption capacity. Monolayer drug adsorption with chemisorption mechanism was observed for 2-DCP-Cu/Ag. In addition to this, decomposition temperature of polymer was 440 and 325 degrees C while glass transition temperature of polymer was 280 and 200 degrees C before and after metal modification, respectively. (A=aqueous phase; B=organic phase; C=drug solution; D=drug loaded polymer; E=enlarged drug loaded polymer.) [GRAPHICS] .

10aAdsorption isotherm10aadsorption kinetics10acrosslink polymer10adrug loading10alangmuir adsorption isotherm10asalbutamol1 aMane, Sachin1 aPonrathnam, Surendra1 aChavan, Nayaku uhttps://library.ncl.res.in/content/crosslinked-polymer-embedded-cuag-comparative-drug-adsorption-and-kinetics-evaluation-101975nas a2200229 4500008004100000022001400041245014000055210006900195260007100264300001200335490000700347520109700354653002401451653002401475653001701499653001801516653002401534100001701558700002501575700001901600856012601619 2016 eng d a0091-403700aInterfacial tension approach toward drug loading with two-dimensional crosslinked polymer embedded gold: adsorption kinetics evaluation0 aInterfacial tension approach toward drug loading with twodimensi aKARL JOHANS GATE 5, NO-0154 OSLO, NORWAYbTAYLOR & FRANCIS AScJAN a168-1750 v653 a

Interfacial tension of drugs with hydrophilic polymer (A) embedded gold resulting into selective drug adsorption, which also affected the drug adsorption kinetics. Two-dimensional crosslinked polymer embedded gold was synthesized for drug loading application in an acidic buffer. Lower interfacial tension of pantoprazole sodium (B) revealed the exponential loading inversely loading was gradual for chloroquine (C) having more interfacial tension with adsorbent. Initial 2 h was the exponential adsorption period for a pantoprazole sodium whereas exponential adsorption begins after 12 h for a chloroquine. Monolayer drug adsorption was obtained because Langmuir adsorption isotherm was obeyed by both drugs. Moreover, pseudo first-and pseudo second-order kinetics was also evaluated which demonstrated that reactive sites of the adsorbent are homogeneous and drug adsorption mechanism is chemisorption and not the physisorption. Thermal analysis was evaluated to confirm the polymer thermostability and glass transition temperature during catalytic applications in thermal reactions.

10aAdsorption isotherm10aadsorption kinetics10adrug loading10adrug polarity10aInterfacial tension1 aMane, Sachin1 aPonrathnam, Surendra1 aChavan, Nayaku uhttps://library.ncl.res.in/content/interfacial-tension-approach-toward-drug-loading-two-dimensional-crosslinked-polymer-002131nas a2200253 4500008004100000022001400041245013100055210006900186260000900255300000700264490000700271520127900278653002401557653001001581653001801591653001701609653002301626653001501649100002201664700002201686700001901708700001801727856013201745 2019 eng d a1022-976000aAdsorptive removal of chromium(VI) using spherical resorcinol-formaldehyde beads prepared by inverse suspension polymerization0 aAdsorptive removal of chromiumVI using spherical resorcinolforma cJAN  a410 v263 a

The spherical cross-linked beaded polymers were prepared by condensation of resorcinol and formaldehyde in presence of tri-ethylamine by inverse suspension polymerization technique. The m-cresol, aniline, urea and thiourea were used as co-monomer and polyethylene glycol (PEG 400) was used as porogen. Paraffin oil was used as non-aqueous suspension agent. The polymeric spherical beads were prepared using various types of comonomers exhibiting range of particle size 77.62 to 158.84m at 90 degrees C and 300rpm for 4h. The resulting beads were analyzed by elemental analysis, particle size analysis and scanning electron microscope (SEM). The synthesized beads were used for the removal of Cr(VI) from aqueous solutions. A simple and sensitive solid phase extraction procedure was used for the determination of chromium at trace level by spectrophotometric method using 1,5-diphenylcarbazide reagent. The adsorption of Cr(VI) on the resorcinol-formaldehyde beads was monitored by energy-dispersive X-ray spectroscopy (EDX) analysis. The metal adsorption parameters such as contact time, pH, metal ion concentration and adsorbent dose were investigated. For Cr(VI), the maximum adsorption capacity was about 99% at pH2 for the resorcinol-formaldehyde beads obtained.

10aadsorption kinetics10aBeads10aChromium (VI)10aFormaldehyde10aInverse suspension10aResorcinol1 aMulani, Khudbudin1 aPatil, Vishwanath1 aChavan, Nayaku1 aDonde, Kamini uhttps://library.ncl.res.in/content/adsorptive-removal-chromiumvi-using-spherical-resorcinol-formaldehyde-beads-prepared-inverse02178nas a2200241 4500008004100000022001400041245011600055210006900171260000800240300001200248490000700260520134600267653002401613653002401637653002901661653002201690100001701712700002101729700002001750700001601770700001901786856013101805 2024 eng d a0971-457X00aSynthetic layered double hydroxide on biodegradable support: an efficient adsorbent for defluoridation of water0 aSynthetic layered double hydroxide on biodegradable support an e cJAN a152-1610 v313 a

Fluoride concentrations in drinking water above permissible levels and incidences of fluorosis among people have been reported from many parts of the world including India. Low-cost and biodegradable adsorbents are the preferred choice for the removal of fluoride from an aqueous medium. In the present study, zinc-aluminium layered double hydroxide (LDH) supported on sugarcane bagasse (raw and acid-treated) has been synthesized, characterized, and investigated for the defluoridation of water. The SEM micrographs of the supported adsorbents show good dispersion of the LDH particles on the support material. The defluoridation capacity of the LDH is enhanced by supporting it on bagasse. The adsorption capacity of supported adsorbents increased by 3-fold than the unsupported LDH adsorbent. The adsorption data have been well fitted to the Freundlich isotherm model indicating physical and multi-layer adsorption. The maximum fluoride adsorption capacity has been found to be 8.85 mg/g with 76.3% fluoride removal when the initial fluoride concentration is 11-12 mg/L. The pseudo-second-order kinetic model has been found suitable to explain the fluoride adsorption kinetics on the supported LDH adsorbents. The present study reveals that the bagasse-supported LDH adsorbent has a high potential for defluoridation of water.

10aadsorption kinetics10aFluoride adsorption10aLayered double hydroxide10aSugarcane bagasse1 aMayadevi, S.1 aKirandas, M., D.1 aManilal, A., M.1 aRoshini, N.1 aMandal, Sujata uhttps://library.ncl.res.in/content/synthetic-layered-double-hydroxide-biodegradable-support-efficient-adsorbent-defluoridation