Academic literature on the topic 'Guar gum/MZVI suspension'
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Journal articles on the topic "Guar gum/MZVI suspension"
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Mondino, Federico, Amelia Piscitello, Carlo Bianco, Andrea Gallo, Alessandra de Folly D’Auris, Tiziana Tosco, Marco Tagliabue, and Rajandrea Sethi. "Injection of Zerovalent Iron Gels for Aquifer Nanoremediation: Lab Experiments and Modeling." Water 12, no. 3 (March 15, 2020): 826. http://dx.doi.org/10.3390/w12030826.
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One of the main technical problems faced during field-scale injections of iron microparticles (mZVI) for groundwater nanoremediation is related to their poor colloidal stability and mobility in porous media. In this study, a shear-thinning gel, composed of a mixture of two environmentally friendly biopolymers, i.e., guar gum and xanthan gum, was employed to overcome these limitations. The slurry rheology and particle mobility were characterized by column transport tests. Then, a radial transport experiment was performed to mimic the particle delivery in more realistic conditions. The gel, even at a low polymeric content (1.75 g/L), proved effective in enhancing the mobility of high concentrated mZVI suspensions (20 g/L) in field-like conditions. The high radius of influence (73 cm) and homogeneous iron distribution were achieved by maintaining a low injection overpressure (<0.4 bar). Based only on the information derived from column tests, the MNMs 2018 software (Micro- and Nanoparticle transport, filtration, and clogging Model-Suite) was able to predict the particle distribution and pressure build-up measured in the radial domain. Experimental and simulated results showed good agreement, thus proving that a simplified experimental-modeling procedure based on 1D column tests could be used to effectively upscale the slurry behavior to more representative scales, e.g., radial domains.
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Su, Ying, Yi Ding Shen, Xiao Juan Lai, and Xiao Rong Wang. "Preparation and Property of Hydrophobic Modified Guar Gum Thickener." Advanced Materials Research 631-632 (January 2013): 260–64. http://dx.doi.org/10.4028/www.scientific.net/amr.631-632.260.
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The modified guar gum was synthesized with guar gum as material and bromododecane as etherifying agent by suspension polymerization method. The solution and gel of the modified guar gum were also prepared. The structure and the property of the modified guar gum were analysized by Fourier transform infrared spectrum (FT-IR), X-ray diffraction (XRD) and thermogravimetric analysis (TGA). The heat resistance and the viscoelasticity modulus of the gel were also researched by rheometer. The results of FT-IR and XRD show that the hydrophobic long chain has been introduced into the guar gum successfully. TGA indicates that the modified guar gum has higher thermal stability. The rheology tests reflect that with different temperature conditions, the shear viscosity, the viscoelasticity modulus of the gel and the heat resistance of the modified guar gum are both better than that of the unmodified guar gum. The modified guar gum can be used as thickener of fracturing fluid, and it can reduce its amount.
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Velimirovic, Milica, Hong Chen, Queenie Simons, and Leen Bastiaens. "Reactivity recovery of guar gum coupled mZVI by means of enzymatic breakdown and rinsing." Journal of Contaminant Hydrology 142-143 (November 2012): 1–10. http://dx.doi.org/10.1016/j.jconhyd.2012.09.003.
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Sugita, Purwantiningsih, Bambang Srijanto, Budi Arifin, and Ellin Vina Setyowati. "STABILITY OF KETOPROFEN COATED BY CHITOSAN-GUAR GUM GEL." Indonesian Journal of Chemistry 9, no. 3 (June 24, 2010): 391–97. http://dx.doi.org/10.22146/ijc.21504.
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The coating stability of ketoprofen by chitosan-guar gum gel has been studied. Into 228.6 mL of 1.75% (w/v) chitosan solution in 1% (v/v) acetic acid, 38.1 mL of guar gum (gg) solution was added with concentration variation of 0.35, 0.55, and 0.75% (w/v) for ketoprofen microcapsules, and stirred with magnetic stirrer until homogenous. Afterwards, 7.62 mL of glutaraldehyde (glu) was added slowly under stirring, with concentrations varied: 3, 3.5, and 4% (v/v). All mixtures were shaked for 20 min for homogenization. Into each microcapsule mixture for ketoprofen, a solution of 2 g of ketoprofen in 250 mL of 96% ethanol was added. Every mixture was then added with 5 mL of 2% Tween-80 and stirred with magnetic stirrer for an hour at room temperature. Conversion of suspension into fine powders/granules (microcapsules) was done by using spray dryer. Every microcapsule formula was packed into capsules, as much as 100 g per capsule. The capsules were contained in 100-mL dark bottles and the bottles were kept in climatic chamber at (40 ± 2) °C and RH (75 ± 5) % for 3 months. The microcapsule stabilities were tested chemically and physically. The result showed that formulation of ketoprofen preparation composed of 1.75% (w/v) chitosan, 0.35% (w/v) gg, and 3.50% (v/v) glu, was relatively the best, with ketoprofen percentage left in microcapsule after 3 months, degradation rate constant, and shelf life of 80.33%, 0.0351 % week-1, and 18.92 months, respectively. Reaction kinetic model for this formula followed Prout-Tompkins equation and the degradation of ketoprofen was seem to follow autocatalytic reaction mechanism controlled by the formation and growth of reaction core. Keywords: Ketoprofen, chitosan-guar gum gel
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Pressi, Giovanna, Elisa Barbieri, Raffaella Rizzi, Giovanni Tafuro, Alessia Costantini, Elisa Di Domenico, and Alessandra Semenzato. "Formulation and Physical Characterization of a Polysaccharidic Gel for the Vehiculation of an Insoluble Phytoextract for Mucosal Application." Polysaccharides 3, no. 4 (November 9, 2022): 728–44. http://dx.doi.org/10.3390/polysaccharides3040042.
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Maintaining insoluble plant-based ingredients in suspension and ensuring long-term physical stability is particularly challenging for formulators of green cosmetics. This study aimed to evaluate the structure and applicative properties of gel and gel-cream topical formulations suitable for delivering an insoluble phytocomplex on the vaginal mucosa and maintaining its integrity. For this purpose, we studied the compatibility of Perilla frutescens (L.) Britton phytocomplex (PFP), derived from in vitro plant cell cultures and presented as a powder finely dispersed in glycerin, with different classes of natural rheological modifiers (such as xanthan gum, sclerotium gum, succinoglycan, xyloglucan, diutan gum, hydroxypropyl guar gum derivative) in gel and gel-cream formulations, to meet the needs of the cosmetic market for naturalness and biodegradability. Through rheological and texture analyses, we studied the physico–mechanical properties of the samples, comparing the performances of the chosen polysaccharides to those of acrylic polymeric rheological modifiers, evaluating their contribution in terms of stability and applicative properties. Since a weak-gel rheological pattern proved to be the optimal one to keep the actives in suspension, the associations of tamarind seed polysaccharides with succinoglycan or scleroglucan were the most suitable for the formulation of mucoadhesive gels.
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Ghosh, Indrasena, Chhaya Sharma, and Rita Tandon. "Comparative study of guar gum and its cationic derivatives as pre-flocculating polymers for PCC fillers in papermaking applications." April 2022 21, no. 4 (May 1, 2022): 203–16. http://dx.doi.org/10.32964/tj21.4.203.
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In this work, gums from guar seeds were evaluated as a potential precipitated calcium carbonate (PCC) filler pre-flocculant to induce functional filler in papermaking applications. In recent years, guar has been conidered one of the promising wet-end additives due to its abundance, rich source of hemicellulose content, and bio-degradability. However, application of guar gum in filler pretreatment methods for producing high ash paper has scarcely been reported. In this paper, the flocculating ability of three types of guar gum was established with charge analysis and turbidity (NTU) of the system at 1% and 5% for each gum: native gum (NG) having a degree of substitution (DS) of 0, and cationic gums having a DS value of 0.07 (CL) and 0.15 (CH). It was interesting to observe that even at a 5% dose of G, the charge density of PCC did not deviate much from the initial values. The system carried a weak negativeharge, resulting in an unstable colloidal suspension that led to PCC-PCC particle bridging. On the other hand, the operative mechanism of CL and CH during adsorption and PCC flocculation was predicted to be charge neutralization and electrostatic-patch formation, accompanied by particle bridging. Note that CL, with a maximum 47.5% eduction in residual turbidity of PCC at a 1% dose, was much more efficient in doing so than the other two gums; NG had a 40% maximum reduction in residual turbidity at a 5% dose and CH had a maximum 30% reduction at a 1% ose. Later on, floc formation and structure were correlated with optical and field emission scanning electron microscopy (FE-SEM) images. In the next set of trials, paper properties were determined by varying the different gum dosages from 0.2% to 5% at a constant dose of 20% filler. It is also noteworthy to mention that with 1% CL (low DS) dose, PCC retention increased by 39%, which also enhanced the tensile, tear, burst, and opacity properties by 11%, 19%, 5%, and 4.4%, respectively, without significantly affecting the bulk properties. Further, wide-angle X-ray diffraction (XRD) analysis and Fourier transform infrared (FTIR) analysis revealed that pre-flocculating PCC with a 1% gum dose did not induce any change in crystalline transformation. Based on observation, it was found that cationic gums with low DS values re a better choice for maximizing the strength of paper while maintaining bulk and high opacity when pre-flocculaion is adopted to increase the filler retention in paper.
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Sun, Chenggui, and Yaman Boluk. "Rheological behavior and particle suspension capability of guar gum: sodium tetraborate decahydrate gels containing cellulose nanofibrils." Cellulose 23, no. 5 (August 5, 2016): 3013–22. http://dx.doi.org/10.1007/s10570-016-1015-x.
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Wang, Shibin, Yiyao Zhang, Jianchun Guo, Jie Lai, Dean Wang, Le He, and Yuyin Qin. "A study of relation between suspension behavior and microstructure and viscoelastic property of guar gum fracturing fluid." Journal of Petroleum Science and Engineering 124 (December 2014): 432–35. http://dx.doi.org/10.1016/j.petrol.2014.09.016.
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Natania, Kam, and Giovani Fransisca Setiawan. "Characterization of Antimicrobial Edible Films with Single and Double Emulsions from Clove (Syzygium aromaticum) Oil." Reaktor 20, no. 1 (March 13, 2020): 38–46. http://dx.doi.org/10.14710/reaktor.20.1.38-46.
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Clove oil as a potent antimicrobial agent was added to enhance the properties of edible films. Clove oil was converted to single and double emulsion emulsions for homogenous dispersion in a starch based edible film suspension. Double emulsion was made with two steps emulsification with CaCl2 as inner water phase and guar gum as outer water phase. Single emulsion was prepared similarly without inner water phase. The physico-chemical characteristics and the antimicrobial activity of the of starch-based edible film added with the emulsion were observed. MBC/MFC of clove oil was determined against E. coli, S. aureus, R. stolonifer, and A. niger which gives value of 1.95, 1.46, 0.52, and 0.35 mg/ml respectively. Incorporation of different emulsions on starch-based edible films affect the properties of resulting edible films by increasing thickness, opacity, elongation at break, water vapor transmission rate, and swelling index. Both emulsions showed comparable physicochemical characteristics such as thickness, WVTR, and swelling index value. However, double emulsion produced more superior edible films in terms of tensile strength and antimicrobial activity. 15% addition of double emulsion were able to show strong antimicrobial activity with inhibition zone of more than 8.0 mm for E. coli and 24.0 mm for R. stolonifer.Keywords: clove oil; edible film; single and double emulsion
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Varma, M. Mohan, and H. L. N. Rao. "Evaluation of Aceclofenac Loaded Alginate Mucoadhesive Spheres Prepared by Ionic Gelation." International Journal of Pharmaceutical Sciences and Nanotechnology 5, no. 4 (February 28, 2013): 1847–57. http://dx.doi.org/10.37285/ijpsn.2012.5.4.4.
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Controlled release aceclofenac spheres were prepared in a cross-linked alginate matrix using ionotropic gelation technique. A suspension of aceclofenac in sodium alginate solution was added drop wise into 10% w/v calcium chloride solution and the resulting spheres were evaluated for their drug content, flow properties, mucoadhesive property and the dissolution rate. The aceclofenac loaded alginate spheres were prepared using various mucoadhesive polymers: sodium alginate, HPMC, sodium CMC, guar gum, methyl cellulose and carbopol. The calcium chloride was used as the crosslinking agent. Fourier transform infrared spectroscopy (FTIR) was used to evaluate the drug-polymer interaction. The alginate spheres showed good rheological properties, drug content uniformity and high entrapment efficiency. The aceclofenac release from the spheres was slow and extended up to 10 hours. The drug loaded spheres exhibited good mucoadhesive property in the in vitro wash off test. The drug release from the optimized formulation (drug-sodium alginate-HPMC K15M; 1:0.9: 0.1 ratio) followed zero order kinetics and exhibited non-Fickian diffusion. The rate of release of aceclofenac decreased with increasing concentration of sodium alginate due to slow penetration of dissolution fluid in the spheres. The results suggest that alginate spheres can potentially deliver aceclofenac at zero-order controlled release following oral administration. The FTIR studies indicated the absence of the drug-polymer interaction in the solid state.
Dissertations / Theses on the topic "Guar gum/MZVI suspension"
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Firouznia, Mohammadhossein. "The Hydrodynamic Interaction of Two Small Freely-moving Particles in a Couette Flow of a Yield Stress Fluid." Ohio University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1502901401749626.
Full textConference papers on the topic "Guar gum/MZVI suspension"
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Kamel, Ahmed H. "A Comparative Investigation of Rheological and Flow Behavior Among Clean Polymeric and Surfactant Based Fluids." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-65133.
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This study involves experimental investigation of rheological and hydraulic characteristics of aqueous based polymeric and surfactant fluids in straight and coiled tubing. The fluids matrix includes guar, HPG, PHPA, welan, xanthan, and surfactant. Bohlin rheometer was used to evaluate rheological and viscoelastic characteristics. For hydraulic characteristics, small- and large-scale flow loops were used. It is observed that all fluids exhibit comparable non-Newtonian behavior and improved viscous and elastic properties. Among polymeric fluids, guar and welan provide better viscosity and suspension properties. Surfactant is significantly affected by the formation of rod-like micelles and other microstructures. Master curves for rheological and elastic properties are developed using the molecular theory approach. The foremost benefit of these curves is its dimensionless form that provides a unique technique to predict viscosity for all fluids. For hydraulic properties, friction losses in coiled tubing are significantly higher than in straight tubing due to centrifugal forces and secondary flows. Surfactant is more sensitive to shear field applied where different microstructures are induced and thus they exhibit better drag reduction characteristics than polymeric fluids especially in coiled tubing with larger sizes. However, in straight tubing, guar shows better drag reduction characteristics than surfactant and other polymers, which diminishes as tubing size increases. However, welan gum exhibits a comparable performance. Overall, all fluids are considered good candidates as fracturing fluids with specific features for each. Unique characteristics of each fluid is discussed and explained in more details within the context of the present paper.
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Siddiqui, Farhan, and Arezoo Emrani. "A Novel Polysaccharide Friction Reducer That can be Used with Water of All Salinity Levels." In SPE Annual Technical Conference and Exhibition. SPE, 2022. http://dx.doi.org/10.2118/210207-ms.
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Abstract This work was carried out to compare a new system with synthetic polyacrylamide friction reducers used in the oil and gas industry. The most common friction reducers used for fracturing are anionic, and hence have limited use in high TDS brines especially in brines containing di and trivalent metal ions. When the new system is properly optimized, we were able to achieve a very efficient and low-cost carrier fluid that can give maximum friction reduction and effectively suspend proppant during a fracturing treatment. The new technology for unconventional fracturing is a versatile and multifunctional product that can be pumped with the traditional frac equipment used in the industry for pumping powdered dry guar gum on the fly. The main objective of this work is to develop a new friction reducer formulation to aim to reduce cost and improve retained conductivity. This product is shown to be Gulf of Mexico green and biodegradable. Conventional breakers can be used to break these fluids and give excellent retained permeability on cores. The new system gives good friction reduction even at a very small dosage of 1ppt to 4ppt or 0.25-1.0 gpt, and it can be used similarly to guar gum as a linear gel or can be crosslinked with boron to yield better viscosity and proppant transport. The presence of iron in water can seriously affect the rheology and friction of traditional friction reducers, high viscosity friction reducers, and even guar systems. Laboratory studies have shown that this new product is very effective even in water containing very high concentrations of Ferric iron. Case histories from wells treated with this system containing high divalent and trivalent metal ions confirm the laboratory findings. In countries where equipment to pump on the fly is not available, the new system can be used as a slurry also. This paper will present laboratory test results of using a new polysaccharide friction reducer with similar friction reduction to a Polyacrylamide Friction reducer and the proppant suspension of a crosslinked guar system. This system can be used with fresh or saline waters containing high concentrations of divalent and trivalent metal ions. This gives the operator the flexibility of using any water, and the water analysis step before a frac job can be eliminated.
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Monreal, Gabriel, Frank Zamora, Hans Henrik Ovrebo, Peter Orizondo, and Otto Soidinsalo. "Characterization of a New Green Material for Offshore Well Completions and Downhole Treatments." In Offshore Technology Conference. OTC, 2022. http://dx.doi.org/10.4043/31870-ms.
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Abstract In oil and gas well construction during the drillouts or wellbore cleaning process, one of the most critical functions of land and offshore completions fluids is the ability to suspend solids effectively under extreme downhole conditions. Conventional agents such as xanthan gum, HEC and numerous other polymers have historically been used to accomplish this function, albeit with limitations. Functionally, these commonly used polymers depend primarily upon viscosity rather than elastic characteristics to suspend solids and require intensive chemical processing that leads to high deployment cost. Recently microfibrillated cellulose (MFC) has been investigated as a prospective suspending agent in carrier fluids for extreme downhole conditions. MFC is a unique type of superfine cellulose fibrils obtained from fully sustainable sources that have been subjected to proprietary treatment procedures, resulting in fibril bundles consisting of lateral dimensions in the sub-micron scale and lengths up to micron scale with abundant terminal hydroxyl functional groups. When dispersed into aqueous solutions, the resulting fluid has been characterized to have several favorable rheological, chemical and mechanical properties. Rheological measurements show the viscoelasticity of MFC dispersions is dominated by their storage modulus (G′ > G″) even with fluids formulated with as low as 0.25 wt% (about 20 lbm MFC /1000 gallons). The result is a suspension that exhibits superior particle suspension properties compared on a mass basis to conventional materials such as guar, CMC, HEC and xanthan gum. In addition, MFC solutions exhibit comparatively high viscosities at low shear rates but thin by several orders of magnitude at high shear, a characteristic that implies less work on surface equipment while having the ability to suspend solids at very low pump rates. MFC dispersions also have an excellent brine tolerance, demonstrating stable suspensions over weeks in fluids containing up to 150,000 mg/L TDS. The dispersions are stable at downhole relevant temperatures, applicable at low and high pH levels and resistant to shear degradation. Finally, MFC originates from natural resources and is environmentally benign and biodegradable. This paper describes the comprehensive characterization of the rheological and suspension properties that distinguish MFC from other conventionally used materials and make it fit-for-purpose as a robust, environmentally benign and high-performance suspending agent for downhole applications.