Nalco Holding Company

About: Nalco Holding Company is a based out in . It is known for research contribution in the topics: Corrosion & Aqueous solution. The organization has 2375 authors who have published 3056 publications receiving 51473 citations.

Water soluble corrosion inhibitors

Abstract: This invention is a method for inhibiting corrosion in metallic flow lines containing hydrocarbon and/or aqueous fluids comprising adding to the fluid contained in the flow line a corrosion inhibiting amount of a water-soluble ampholytic substituted imidazoline having the formula: ##STR1## wherein R1 comprises a radical selected from the group consisting of hydrogen, alkyl, and aryl groups having 6 to 30 carbons; R2 comprises a radical selected from the group consisting of polyalkylene polyamines having from 2 to 16 carbon atoms, NH 2 , N(R 4 ) 2 , OH and SH; R 3 is a radical selected from the group consisting of carboxylate, carbonate, sulfite, sulfate, phosphite, and phosphate; n is a number from 1 to 10; and, R4 comprises a branched or linear alkyl chain having a length of 1 to 8.

Etoposide-loaded biodegradable amphiphilic methoxy (poly ethylene glycol) and poly (epsilon caprolactone) copolymeric micelles as drug delivery vehicle for cancer therapy.

Abstract: Amphiphilic diblock copolymers composed of methoxy poly ethylene glycol (MePEG) and poly epsilon caprolactone (PCL) were synthesized for the formation of micelles by ring opening mechanism using stannous octoate as a catalyst. The effects of the molecular weight of MePEG and the copolymer ratio on the properties of micelles were investigated by Nuclear Magnetic Resonance (1H-NMR), Fourier Transform Infrared Spectroscopy (FT-IR), and Gel Permeation Chromatography (GPC). The diblock copolymers were self-assembled to form micelles and their hydrophobic core was used for the encapsulation of the anti-cancer drug (etoposide) in aqueous solution. The sizes of micelles were less than 250 nm with a narrow size distribution with monodispersed unimodal pattern. Differential Scanning Calorimetric (DSC) thermogram was done for etoposide-loaded micelles to understand the crystalline nature of the drug after entrapment. A drug loading capacity up to 60% (w/w) with an entrapment efficiency of 68% was achieved as determi...

Polyelectrolyte-Induced Aggregation of Microcrystalline Cellulose: Reversibility and Shear Effects.

Abstract: The polyelectrolyte-induced aggregation of microcrystalline cellulose (MCC) was studied by focused beam reflectance measurement (FBRM) to determine the reversibility of MCC aggregation under high-shear conditions. A correlation was established between the mean chord length output of FBRM probing a high-shear zone with the mean particle size (laser diffraction) of an aliquot extracted from the low-shear bulk mixing zone. Flocs formed by addition of a cationic polyelectrolyte were ruptured by shear forces of mixing and did not reaggregate at low mixing intensities. Flocs formed by addition of both polyelectrolyte and colloidal silica sols were found to reaggregate at low shear quite reversibly following high-shear degradation. The Kolmolgoroff microscale, η, was determined using a three-compartment mixing model for the FBRM experiments, and the minimum aggregate adhesion forces were calculated to be ∼3 nN under the experimental mixing conditions. Shear-dependent FBRM studies are also used to estimate the radial dependence of particle adhesion forces within an aggregate. AFM-based surface force measurements between model anionic surfaces (mica and glass beads) showed more reversible adhesion forces in the presence of colloidal silica than with cationic polyelectrolyte only. A descriptive model of the interfaces giving rise to the observed MCC aggregation and adhesion behavior is proposed.