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Alleviation of the plastic deformation of gel ink under strong stress through an esterification of xanthan gum reinforcing its double helix structure

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Chinese Journal of Chemical Engineering 2024年第3期67卷 49-57页

作者： Xiaokun Li Mingyi Wang Zilu Liu Song Yang Na Xu Wei Zhao Gan Luo Shoujun Liu College of Chemical Engineering and Technology Taiyuan University of TechnologyTaiyuan 030024China Shanxi Engineering Center of Civil Clean Fuel Taiyuan University of TechnologyTaiyuan 030024China Shanxi Coking Coal in Yuncheng Salt Refco Group Ltd. Yuncheng 044000China

As a natural organic polymer,xanthan gum(XG)can alleviate the plastic deformation of gel ink under strong stress and realize the reasonable regulation of the rheological properties of gel ***,as the double-helix structure connected by hydrogen bonds cannot resist the mechanical environment of strong stress,XG shows poor shear *** this study,a polymer gel with interpenetrating polymer network structure was prepared by esterifying XG,taking polystyrene maleic anhydride(SMA)as the *** addition to retaining the excellent rheological properties of XG,the generated polymer gel also exhibited high shear *** optimal addition amount of the esterification reaction modifier was determined as mXG:mSMA=5:3 according to the gel ink *** this amount,the viscosity of the modified xanthan gum(SXG)gel increased to 1578.8 mPa·s and 100.7 mPa·s at shear rates of 4 s1 and 383 s1,respectively,and the shear resistance increased more than 2 times compared to the unmodified *** is because of the ester bond formed by esterification that the reaction strengthens the interaction between molecular segments,enabling the new gel to resist to strong mechanical *** new polymer gel studied in this paper and the proposed mechanism of action provide new insights for the development of high-end gel ink and also provide theoretical support for the study of rheological properties of non-Newtonian fluids.

关键词： Gel ink xanthan gum Esterification Simulation Shear resistance Gels

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Temperature/salt tolerance and oil recovery of xanthan gum solution enhanced by surface-modified nanosilicas

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Petroleum Science 2023年第1期20卷 577-589页

作者： Long Xu Xu Liu Hong-Yu Ding Huan Zhang Lei Liu Jing-Hui Li Hou-Jian Gong Ming-Zhe Dong Shandong Key Laboratory of Oilfield Chemistry School of Petroleum EngineeringChina University of Petroleum(East China)QingdaoShandong266580China Key Laboratory of Unconventional Oil&Gas Development(China University of Petroleum(East China)) Ministry of EducationQingdaoShandong266580China Northwest Company of China Petroleum and Chemical Corporation SINOPECUrumqiXinjiang830011China

Amide-and alkyl-modified nanosilicas(AANPs)were synthesized and introduced into xanthan gum(XG)solution,aiming to improve the temperature/salt tolerance and oil *** rheological behaviors of XG/AANP hybrid dispersions were systematically studied at different concentrations,temperatures and inorganic *** high temperature(75C)and high salinity(10,000 mg,L1 NaCl),AANPs increase the apparent viscosity and dynamic modulus of the XG solution,and XG/AANP hybrid dispersion exhibits elastic-dominant *** most effective concentrations of XG and AANP interacting with each other are 1750 mg·L^(-1) and 0.74 wt%,*** temperature tolerance of XG solution is not satisfactory,and high temperature further weakens the salt tolerance of ***,the AANPs significantly enhance the viscoelasticity the XG solution through hydrogen bonds and hydrophobic *** reservoir conditions,XG/AANP hybrid recovers approximately 18.5%more OOIP(original oil in place)than AANP and 11.3%more OOIP than *** enhanced oil recovery mechanism of the XG/AANP hybrid is mainly increasing the sweep coefficient,the contribution from the reduction of oil-water interfacial tension is less.

关键词： Temperature/salt tolerance Rheology Surface-modified nanosilicas xanthan gum Enhanced oil recovery Synergy

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Investigation of Adsorption of xanthan gum on Enamel by Tapping Mode Atomic Force Microscopy

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Chemical Research in Chinese Universities 2004年第4期20卷 501-503页

作者： LIHao-ying DepartmentofOralandDentalScience BiomedicalEngineeringandBiomaterialsScienceSectionUniversityofBristolLowerMaudlinStreetBristolBS12LY

By using tapping mode atomic force microscopy(TMAFM), a polymer layer was found on the enamel surface after the exposure to xanthan gum solutions. The layer thickness is closely related to the exposure time and the concentration of xanthan gum solution. The thickness data were evaluated by a Kruskal-Wallis test and Box-Whisker Plot at a 95% confidence level(pxanthan gum solutions, the mean of layer thickness at the adsorption equilibrium is in the ranges of 103.5_122.06, 82.4_88.94 and 45.27_55.55 nm, respectively. This phenomenon suggests that the viscosity modifying agents in the beverage might be adsorbed on the enamel surface during consumption, which may form a barrier that can protect the enamel from being attacked by acid and therefore reduce dental erosion.

关键词： Atomic force microscopy(AFM) Vertical distance xanthan gum Enamel

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Drag reduction behavior of hydrolyzed polyacrylamide/xanthan gum mixed polymer solutions

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Petroleum Science 2017年第2期14卷 412-423页

作者： Mehdi Habibpour Peter E. Clark School of Chemical Engineering Oklahoma State University Stillwater OK 74078 USA

Partially hydrolyzed polyacrylamide（HPAM）as the main component of slickwater fracturing fluid is a shear-sensitive polymer,which suffers from mechanical degradation at turbulent flow *** different concentrations of HPAM as well as mixtures of polyacrylamide/xanthan gum were prepared to investigate the possibility of improving shear stability of *** reduction（DR）measurements were performed in a closed flow *** HPAM solutions,the extent of DR increased from 30%to67%with increasing HPAM concentration from 100 to1000 *** the HPAM solutions suffered from mechanical degradation and loss of DR efficiency over the shearing *** indicated that the resistance to shear degradation increased with increasing polymer *** efficiency of 600 wppm xanthan gum（XG）was 38%,indicating that XG was not as good a drag reducer as *** with only 6%DR decline,XG solution exhibited a better shear stability compared to HPAM *** HPAM/XG solutions initially exhibited greater DR（40%and 55%）compared to XG,but due to shear degradation,DR%dropped for HPAM/XG *** to 200 wppm HPAM solution,addition of XG did not improve the drag reduction efficiency of HPAM/XG mixed solutions though XG slightly improved the resistance against mechanical degradation in HPAM/XG mixed polymer solutions.

关键词： Slickwater Polyacrylamide xanthan gum Drag reduction Shear stability

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Strength properties of xanthan gum and guar gum treated kaolin at different water contents

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Journal of Rock Mechanics and Geotechnical Engineering 2021年第5期13卷 1160-1172页

作者： Irem Bozyigit Akbar Javadi Selim Altun Department of Civil Engineering Ege UniversityBornova-IzmirTurkey College of Engineering Mathematics and Physical SciencesUniversity of ExeterExeterUK

Nowadays,using biopolymer as a ground improvement method has become very ***,since biopolymers are organic and degradable,their long-term effect is not fully *** this study,the effects of biopolymers on the mechanical behavior of kaolin clay were investigated through a comprehensive program of *** types of biopolymer,*** gum and guar gum were chosen to investigate the effect of biopolymer *** this purpose,specimens were prepared using standard Proctor energy at four different water contents(25%,30%35%and 40%)with 0.5%,1%,1.5%and 2%biopolymer *** specimens were cured for 1 d,7 d,28 d and 90 ***,some of the specimens were kept in the curing room for 3 years to observe the long-term effect of the *** the end of the curing periods,the specimens were subjected to unconfined compression test,and scanning electron microscopy(SEM)analysis was performed to observe the mechanism of strength *** results revealed that the unconfined compressive strength(UCS)of the specimens treated with biopolymers increased in all biopolymer inclusion levels and water contents up to a 90-d curing *** specimens containing xanthan gum,the maximum strength increase was observed at 25%water content and 2%xanthan gum with 90-d *** strength increased 5.23 times induced by xanthan gum addition when compared to the pure ***,the increase in strength reached 8.53 times in specimens treated with guar ***,increasing water content caused more ductile behavior,thus increasing the axial deformation.

关键词： Biopolymer Clay Unconfined compressive strength(UCS) xanthan gum Guar gum Strength properties

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Effect of xanthan gum on the quality of low sodium salted beef and property of myofibril proteins

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Food Science and Human Wellness 2021年第1期10卷 112-118页

作者： Zirui Zhao Shujie Wang Dayu Li Yajun Zhou College of Biological and Agricultural Engineering Jilin UniversityChangchun130025China Department of Food Science and Engineering Jilin UniversityChangchun130062China

The effects of xanthan gum (0 % and 0.3 %) on the quality of low sodium (2.0 %, 2.4 %, 2.8 %, 3.2 %, 3.6 % and 4.0 %) salted beef and property of myofibril proteins (MP) extracted from salted beef were researched. Changes in the salting absorptivity, cooking loss, shear force, color and sensory analysis showed that xanthan gum had a positive effect on the quality of salted beef with low salinity (2.0 %, 2.4 % and 2.8 %). MP of salted beef treated with xanthan gum had higher solubility, lower hydrogen bond than that without it (P xanthan gum. The electrophoresis showed that xanthan gum could improve the concentration of myosin heavy chain, paramyosin and actin after tumble-salting. The data suggested that salted beef and its MP treated with xanthan gum and 2.8 % salt (XS3) had the best properties. Together, xanthan gum could be considered as a sodium salt substitute for the development of low sodium meat products.

关键词： Low sodium Myofibril proteins Salted beef xanthan gum

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Synthesis and Aqueous Solution Viscosity of Hydrophobically Modified xanthan gum

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Journal of Beijing Institute of Technology 2007年第3期16卷 346-351页

作者：钱晓琳吴文辉于培志王建全 School of Materials Science and Engineering Beijing Institute of Technology Exploration & Production Research Institute China Petroleum & Chemical Corporation

Two xanthan gum derivatives hydrophobically modified by 4 or 8 tetradecyl chains per 100 xanthan gum structure units were synthesized. The derivatives were studied by scanning electron microscope and pyrene fluorescence spectrometry. And the aqueous solution apparent viscosity of the derivatives was investi- gated. The results indicate that the network of the derivatives with more hydrophobic groups is closer and tighter. With increasing of alkyl chain substitution degree, the hydrophobically associating interactions enhance in aqueous solution. Aqueous solution apparent viscosity of the derivatives increases with increasing of polymer concentration and alkyl substitution degree, and decreases with the increase of temperature. In the brine solution, the strong viscosity enhancement phenomenon appears. The interaction between the derivatives and surfactant sodium dodecylbenzene sulfonate is strong.

关键词： xanthan gum hydrophobically modified association viscosity

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Effects of xanthan gum on atomization and deposition characteristics in water and Silwet 408 aqueous solution

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International Journal of Agricultural and Biological Engineering 2018年第3期11卷 29-34页

作者： Shilin Wang Xiongkui He Jianli Song Shuangshuang Wang Xiaoming Jia Yun Ling Center for Chemicals Application Technology(CCAT) College of ScienceChina Agricultural UniversityBeijing 100193China College of Engineering Huazhong Agricultural UniversityWuhan 430070China College of Engineering China Agricultural UniversityBeijing 100083China

In order to investigate the effects of viscosity on spray formation and utilization of pesticide,different concentrations of xanthan gum(XG)were added into water and 0.1%Silwet 408 aqueous *** size,relative span(RS),fan angle,length of breakup and maximum retention(Rm)were measured with the LU120-02 nozzle spraying under the pressure of 0.3 *** dynamic spreading of the different solutions on maize leaves was tested using a 5μL *** results showed:VMD,RS,length of breakup and Rm went up as the increasing of XG concentration in the range of 0-0.5%with the same solution,while the fan angle of nozzle and spreading area on maize leaf showed the opposite *** 408 could reduce the surface tension of liquid,which could alter the dominant mode of spray formation and lead to earlier sheet breakup,especially in low viscosity *** the same concentration of XG the addition of Silwet 408 could reduce the RS of drop size spectrum but has no effect on VMD or fan *** water solution,there was no difference with different concentrations of XG in the spreading time on maize ***,in the 0.1%Silwet 408 aqueous solution,the spraying time and area were several-fold of that in water with same XG ***,with the same XG concentration,the smaller surface tension liquid indicated lower Rm,and the difference was magnified as the concentration *** work has demonstrated that initial spray characteristics such as droplet size and RS,fan angle,length of breakup,Rm and spreading area can vary depending on the viscosity of spray ***,by transforming the viscosity of the spray liquid to adjust the droplet spectrum to reduce drift,increasing the Rm and spreading area to improve liquid utilization and reduce the usage of pesticides.

关键词： atomization xanthan gum spray droplet size breakup length dynamic spreading

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Konjac glucomannan and xanthan gum as compression coat for colonic drug delivery:experimental and theoretical evaluations

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Frontiers of Chemical Science and Engineering 2010年第1期4卷 102-108页

作者： Kang WANG Jiangyang FAN Yanjun LIU Zhimin HE Enzyme Technology Laboratory Chemical Engineering Research CenterSchool of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China

Compression coated tablets for oral colon specific delivery systems were developed with a mixture polysaccharide of konjac glucomannan(KGM)and xanthan gum(XG)as the compression *** of cimetidine from compression coated tablets was investigated by release experiment in Vitro.0.22U/mLβ-mannanase was applied in the mimic colon *** structure of the mixture polysaccharide was studied by an atomic force microscope(AFM).The experimental results indicate that a KGM70 tablet with a 0.4 g coat is of good design,due to a less than 5%drug loss in the mimic upper gastrointestinal solution by the synergistic interaction between XG and KGM,and due to about 50%cumulative release in the mimic colon solution by degradation after 24 *** release mechanism and model are discussed based on different periods of drug release including the delay of the drug,the constant release without an enzyme and the delay of *** hydrolysis byβ-mannanase,drug release from the tablet with KGM coat shows an exponential increase,while that from the dosage with the mixture polysaccharide coat is an approximately zero-order process in which the constant release rate relates to the release velocity of a non-degraded system,the content of KGM within the coat and the average molecular weight ratio of KGM to *** was found that XG was the framework of the polysaccharide mixtures by AFM,which is similar to the analysis results from experiments on drug release.

关键词： colon specific delivery compression coated tablet konjac glucomannan xanthan gum synergistic interaction release mechanism and model different period of release structure of mixture polysaccharide

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xanthan gum—Bio-Based Raw Material for Wood Adhesive

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Green and Sustainable Chemistry 2023年第2期13卷 153-161页

作者： Ravindra V. Gadhave Super Bond Adhesives Private Limited Thane India

Due to their lower environmental impact, ease of accessibility, low cost, and biodegradability, bio-renewable sources have been used extensively in the last several decades to synthesize adhesives, substituting petrochemical-based adhesive. Vegetable oils (including palm, castor, jatropha, and soybean oils), lactic acid, potato starch, and other bio-renewable sources are all excellent sources for the synthesis of adhesives that are being taken into consideration for the synthesis of “eco-friendly” adhesives. Due to their widespread use, accessibility, affordability, and biodegradability, biobased raw materials like carbohydrates used to synthesize wood and wood composite adhesive have gradually replaced petrochemical-based adhesive. Recently, xanthan gum, a naturally occurring polymer, has drawn the interest of scientists as a potentially petroleum source replacement. It possesses specific rheological characteristics, excellent water solubility, and stability to heat, and can be used as a binder, thickener, suspending agent, and stabilizer. xanthan gum increases the adhesive strength in addition to increasing the viscosity of water-soluble adhesives. This article discusses xanthan gum as a potential substitute for traditional raw materials derived from petroleum that is used as a raw material for adhesives.

关键词： xanthan gum Bio-Polymer Adhesive Wood Carbohydrates

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