Journal articles: 'Suspensions, chemistry'

1

Chernoburova, Olga, Mathieu Jenny, Sébastien Kiesgen De Richter, Maude Ferrari, and Akira Otsuki. "Dynamic Behavior of Dilute Bentonite Suspensions under Different Chemical Conditions Studied via Magnetic Resonance Imaging Velocimetry." Colloids and Interfaces 2, no. 4 (September 27, 2018): 41. http://dx.doi.org/10.3390/colloids2040041.

Full text

Abstract:

This study investigates dilute aqueous suspensions of bentonite particles using magnetic resonance imaging (MRI) velocimetry. Four different chemical conditions are tested to investigate the influence of pH and type of monovalent electrolyte on the local rheological behavior of bentonite suspensions. The results indicate the shear banding in a dilute suspension of 0.1 vol.% solid due to the formation of a continuous three-dimensional particle network under a certain chemical environment (i.e., pH 4 in 1 × 10−2 M KNO3). This network is responsible for the existence of the yield stress in that dilute suspension. Structural changes induced by modification of suspensions’ chemistry are examined via scanning electron microscopy. A previously established method based on processing the torques acquired via conventional rheometric measurement is also applied as an alternative way to recover local flow information. Within the shear rate range covered by our MRI velocimetry, the results of both methods show good agreement. This study suggests that the existence of a master curve (or global flow curve) for dilute suspensions is dependent on the bentonite particle organization, which is influenced by the suspension chemistry and the previous flow history.

APA, Harvard, Vancouver, ISO, and other styles

2

Dodange, Setare, Reza Riahifar, Babak Raissi, Maziar S. Yaghmaee, and Amir Alhaji. "Heterocoagulation simulation of nano alumina and silica particle dispersion using discrete element method." International Journal of Materials Research 113, no. 4 (March 22, 2022): 259–70. http://dx.doi.org/10.1515/ijmr-2020-8123.

Full text

Abstract:

Abstract Heterocoagulation in alumina–silica suspension is studied using 2-dimensional discrete element method simulations. Controlling the structure and stability of the binary suspensions via selecting the appropriate size of precursors is crucial in ceramics processing. Alumina and silica particles with a broad range of sizes and size ratios are investigated. The size and the size ratio determine the degree of heterocoagulation and impact the suspension’s structure. Analyzing simulation results shows that when the sizes of silica and alumina particles are comparable, and the radii of particles are below 300 nm, a chain-like structure is formed. In suspensions with high size asymmetry, smaller silica particles surround larger alumina particles, and the degree of heterocoagulation is dependent on the composition of the suspension. The results show that suspension composition can also be used to tune the heterocoagulation structure.

APA, Harvard, Vancouver, ISO, and other styles

3

Ghanaatpishehsanaei, Ghazaleh, and Rajinder Pal. "Rheology of Suspensions of Solid Particles in Liquids Thickened by Starch Nanoparticles." Colloids and Interfaces 7, no. 3 (July 24, 2023): 52. http://dx.doi.org/10.3390/colloids7030052.

Full text

Abstract:

The rheology of suspensions of solid particles in aqueous matrix liquids thickened by starch nanoparticles (SNP) was investigated. The SNP concentration varied from 9.89 to 34.60 wt% based on the aqueous matrix phase. The solids concentration of suspensions varied from 0 to 47 wt% (0 to 56 vol%). The suspensions at any given SNP concentration were generally Newtonian at low solids concentrations. At high solids concentrations, the suspensions were non-Newtonian shear-thinning. With the increase in the SNP concentration, the suspensions become non-Newtonian at a lower solids concentration. The rheological behavior of non-Newtonian suspensions could be described adequately with a power-law model. The consistency index of the suspension increased with the increase in solids concentration of the suspension at any given SNP concentration. The flow behavior index of suspensions was well below unity at high solids concentrations, indicating non-Newtonian shear-thinning behavior. The value of the flow behavior index decreased with the increase in solids concentration indicating an enhancement of shear-thinning in suspensions. The experimental viscosity and consistency data for Newtonian and non-Newtonian suspensions showed good agreement with the predictions of the Pal viscosity model for suspensions.

APA, Harvard, Vancouver, ISO, and other styles

4

Schütz, Christina, Johanna R. Bruckner, Camila Honorato-Rios, Zornitza Tosheva, Manos Anyfantakis, and Jan P. F. Lagerwall. "From Equilibrium Liquid Crystal Formation and Kinetic Arrest to Photonic Bandgap Films Using Suspensions of Cellulose Nanocrystals." Crystals 10, no. 3 (March 13, 2020): 199. http://dx.doi.org/10.3390/cryst10030199.

Full text

Abstract:

The lyotropic cholesteric liquid crystal phase developed by suspensions of cellulose nanocrystals (CNCs) has come increasingly into focus from numerous directions over the last few years. In part, this is because CNC suspensions are sustainably produced aqueous suspensions of a fully bio-derived nanomaterial with attractive properties. Equally important is the interesting and useful behavior exhibited by solid CNC films, created by drying a cholesteric-forming suspension. However, the pathway along which these films are realized, starting from a CNC suspension that may have low enough concentration to be fully isotropic, is more complex than often appreciated, leading to reproducibility problems and confusion. Addressing a broad audience of physicists, chemists, materials scientists and engineers, this Review focuses primarily on the physics and physical chemistry of CNC suspensions and the process of drying them. The ambition is to explain rather than to repeat, hence we spend more time than usual on the meanings and relevance of the key colloid and liquid crystal science concepts that must be mastered in order to understand the behavior of CNC suspensions, and we present some interesting analyses, arguments and data for the first time. We go through the development of cholesteric nuclei (tactoids) from the isotropic phase and their potential impact on the final dry films; the spontaneous CNC fractionation that takes place in the phase coexistence window; the kinetic arrest that sets in when the CNC mass fraction reaches ∼10 wt.%, preserving the cholesteric helical order until the film has dried; the ’coffee-ring effect’ active prior to kinetic arrest, often ruining the uniformity in the produced films; and the compression of the helix during the final water evaporation, giving rise to visible structural color in the films.

APA, Harvard, Vancouver, ISO, and other styles

5

Peng, Yucheng, and Brian Via. "The Effect of Cellulose Nanocrystal Suspension Treatment on Suspension Viscosity and Casted Film Property." Polymers 13, no. 13 (June 30, 2021): 2168. http://dx.doi.org/10.3390/polym13132168.

Full text

Abstract:

Cellulose nanocrystals (CNCs) have attracted significant interest in different industrial sectors. Many applications have been developed and more are being explored. Pre-treatment of the suspension plays a critical role for different applications. In this study, different pre-treatment methods, including homogenization, ultrasonication, and mixing with a magnetic stirrer were applied to a CNC suspension. After treatment, the rheological behaviors of the treated CNC suspensions were characterized using a rotational viscometer. The treated suspensions were then used to cast films for characterization by ultraviolet-visible (UV-Vis) and Fourier transform near-infrared spectroscopy (FT-NIR). All the CNC suspensions demonstrated a shear thinning phenomena. Homogenization or ultrasonication significantly decreased the suspension viscosity compared with the suspension mixed by a magnetic stirrer. The viscosity of CNC suspension changed with time after treatment and settlement of treated CNC suspensions in room conditions increased the viscosity dramatically with time. Different UV and visible light interferences were observed for the CNC films generated from suspensions treated by different methods. The degree of crystallinity of the CNC films evaluated by FT-NIR showed that the film from suspension treated by homogenization and ultrasonication has the highest degree of crystallinity. Pre-treatments of CNC suspension affected the suspension viscosities and formed film properties.

APA, Harvard, Vancouver, ISO, and other styles

6

Dastbaz, Zahra, Shabnam Nargesi Dana, and Seyed Nezameddin Ashrafizadeh. "Preparation of a stabilized aqueous polystyrene suspension via phase inversion." RSC Advances 11, no. 29 (2021): 17547–57. http://dx.doi.org/10.1039/d1ra02292j.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Lee, Seungjun, Jaehoo Lee, and Nongmoon Hwang. "Effect of the Dispersion State in Y5O4F7 Suspension on YOF Coating Deposited by Suspension Plasma Spray." Coatings 11, no. 7 (July 9, 2021): 831. http://dx.doi.org/10.3390/coatings11070831.

Full text

Abstract:

The stable Y5O4F7 suspension for dense yttrium oxyfluoride (YOF) coating by suspension plasma spraying (SPS) was developed. Electrostatically and electrosterically stabilized aqueous Y5O4F7 suspensions were prepared and compared with a commercially available Y5O4F7 suspension without dispersant. The wettability and dispersibility of the Y5O4F7 suspensions were evaluated in terms of the zeta potential, average particle size, and size distribution with electrophoretic light scattering (ELS) and dynamic light scattering (DLS). The viscosity was measured and the sedimentation was tested to examine the fluidity and stability of the Y5O4F7 suspensions. When electrostatic (BYK-154) and electrosteric (BYK-199) dispersants were added to the Y5O4F7 suspension, the isoelectric point (IEP) of Y5O4F7 particles in the suspension shifted to lower pH. The zeta potential of both of electrostatically and electrosterically stabilized Y5O4F7 suspensions were higher than ±40 mV at pH of 8.6, respectively, which were much higher than of the Y5O4F7 suspension without dispersant. Meanwhile, the average particle size of the electrosterically stabilized Y5O4F7 suspension was much smaller than that of the electrostatically stabilized one. The electrosteric stabilization had a great effect on improving the wettability and dispersibility of the Y5O4F7 suspension. The coating rate of the electrosterically stabilized Y5O4F7 suspension was the highest among the three tested suspensions. In addition, the YOF coating deposited with the electrosterically stabilized Y5O4F7 suspension had the highest hardness and the lowest porosity.

APA, Harvard, Vancouver, ISO, and other styles

8

Foley, Lisa, Jennifer Toney, James W. Barlow, Maura O’Connor, Deirdre Fitzgerald-Hughes, and Zebunnissa Ramtoola. "Investigation of the Physical, Chemical and Microbiological Stability of Losartan Potassium 5 mg/mL Extemporaneous Oral Liquid Suspension." Molecules 26, no. 2 (January 8, 2021): 301. http://dx.doi.org/10.3390/molecules26020301.

Full text

Abstract:

Extemporaneous oral liquid preparations are commonly used when there is no commercially available dosage form for adjustable dosing. In most cases, there is a lack of stability data to allow for an accurately assigned shelf life and storage conditions to give greater confidence of product safety and efficacy over its shelf life. The aim of this study was to evaluate the physical, chemical and microbiological stability of an extemporaneous oral liquid suspension of losartan potassium, 5 mg/mL, used to treat paediatric hypertension in Our Lady’s Children’s Hospital Crumlin, Ireland. The losartan content of extemporaneous oral suspensions, prepared with and without addition of water, was measured by UV and confirmed by HPLC analysis. Suspensions were stored at 4 °C and room temperature (RT) and were monitored for changes in; pH, colour, odour, re-dispersibility, Total Aerobic Microbial Count, Total Yeast and Mould Count and absence of E. coli. Results showed that suspensions prepared by both methods, stored at 4 °C and RT, were physically and microbiologically stable over 28 days. Initial losartan content of all suspensions was lower than expected at 80–81% and did not change significantly over the 28 days. HPLC and NMR did not detect degradation of losartan in the samples. Suspensions prepared in water showed 100% losartan content. The reduced initial losartan content was confirmed by HPLC and was related to the acidic pH of the suspension vehicle. Physiochemical properties of the drug are important factors for consideration in the selection of suspension vehicle for extemporaneous compounding of oral suspensions as they can influence the quality, homogeneity and efficacy of these preparations.

APA, Harvard, Vancouver, ISO, and other styles

9

Foley, Lisa, Jennifer Toney, James W. Barlow, Maura O’Connor, Deirdre Fitzgerald-Hughes, and Zebunnissa Ramtoola. "Investigation of the Physical, Chemical and Microbiological Stability of Losartan Potassium 5 mg/mL Extemporaneous Oral Liquid Suspension." Molecules 26, no. 2 (January 8, 2021): 301. http://dx.doi.org/10.3390/molecules26020301.

Full text

Abstract:

Extemporaneous oral liquid preparations are commonly used when there is no commercially available dosage form for adjustable dosing. In most cases, there is a lack of stability data to allow for an accurately assigned shelf life and storage conditions to give greater confidence of product safety and efficacy over its shelf life. The aim of this study was to evaluate the physical, chemical and microbiological stability of an extemporaneous oral liquid suspension of losartan potassium, 5 mg/mL, used to treat paediatric hypertension in Our Lady’s Children’s Hospital Crumlin, Ireland. The losartan content of extemporaneous oral suspensions, prepared with and without addition of water, was measured by UV and confirmed by HPLC analysis. Suspensions were stored at 4 °C and room temperature (RT) and were monitored for changes in; pH, colour, odour, re-dispersibility, Total Aerobic Microbial Count, Total Yeast and Mould Count and absence of E. coli. Results showed that suspensions prepared by both methods, stored at 4 °C and RT, were physically and microbiologically stable over 28 days. Initial losartan content of all suspensions was lower than expected at 80–81% and did not change significantly over the 28 days. HPLC and NMR did not detect degradation of losartan in the samples. Suspensions prepared in water showed 100% losartan content. The reduced initial losartan content was confirmed by HPLC and was related to the acidic pH of the suspension vehicle. Physiochemical properties of the drug are important factors for consideration in the selection of suspension vehicle for extemporaneous compounding of oral suspensions as they can influence the quality, homogeneity and efficacy of these preparations.

APA, Harvard, Vancouver, ISO, and other styles

10

Schramm, Laurier L., and Loren G. Hepler. "Surface and interfacial tensions of aqueous dispersions of charged colloidal (clay) particles." Canadian Journal of Chemistry 72, no. 9 (September 1, 1994): 1915–20. http://dx.doi.org/10.1139/v94-243.

Full text

Abstract:

We have measured (du Nouy ring and maximum bubble pressure methods) suspension–air surface tensions of aqueous suspensions of montmorillonite and have observed that these surface tensions are larger than those of pure water at the same temperatures. Further measurements have shown that dispersed montmorillonite also increases the suspension–toluene interfacial tension compared with that of pure water–toluene. Similar measurements on aqueous suspensions of kaolinite have yielded suspension–air interfacial tensions with uncertainties as large as the observed (small) effect, and also shown that the suspension–toluene interfacial tension is decreased (opposite to the effect of montmorillonite) by amounts larger than the experimental uncertainties. Measurements of maximum bubble pressures at different flow rates have provided information about the effect of surface age on observed surface tensions.

APA, Harvard, Vancouver, ISO, and other styles

11

Cioroiu, Doinita Roxana, Oana Cristina Parvulescu, Claudia Irina Koncsag, Tanase Dobre, and Cristian Raducanu. "Rheological Characterization of Algal Suspensions for Bioethanol Processing." Revista de Chimie 68, no. 10 (November 15, 2017): 2311–16. http://dx.doi.org/10.37358/rc.17.10.5875.

Full text

Abstract:

The paper has aimed at studying the rheology of macroalgae aqueous suspensions in the presence of cellulase enzyme relevant to bioethanol processing by a subsequent fermentation. Rheological measurements of aqueous suspensions of Ceramium virgatum and Cladophora vagabunda macroalgae species were performed using a Couette geometry rotational viscosimeter. The effects of operation temperature (t=25, 50 �C), cellulase/dried algae ratio (R=0, 16 U/mgda), and algal suspension mass concentration (c=5-15%) on rheological behaviour and parameters were evaluated. Algal suspensions behaved as non-Newtonian fluids obeying either a Bingham plastic linear relationship or an Ostwald-de Waele power law corresponding to a pseudoplastic fluid. Characteristic dynamic viscosity of Bingham plastic fluids were in the range 0.045-0.115 Pa�s for C. virgatum suspensions and 0.021-0.114 Pa�s for C. vagabunda ones, whereas apparent viscosity varied from 0.138 Pa�s to 43.551 Pa�s for C. virgatum and from 0.181 Pa�s to 45.417 Pa�s for C. vagabunda. Data obtained in 8 rheological tests corresponding to a Bingham plastic behaviour of C. vagabunda suspensions, which were processed according to a 23 factorial experiment, emphasized an increase in suspension viscosity with all process factors. The results could be useful for optimization of enzymatic hydrolysis process in order to develop efficient and cost effective saccharification and fermentation strategies.

APA, Harvard, Vancouver, ISO, and other styles

12

Lupu, Andrei Cristian, Mihaela Bombos, Cristian Alin Barbacariu, Constantin Roman, Raluca Mindru, Gabriela Victoria Martinescu, and Liviu Dan Miron. "Conditioning of Praziquantel and Florfenicol for some Heterologous Coinfections of Farmed Carp." Revista de Chimie 70, no. 7 (August 15, 2019): 2404–9. http://dx.doi.org/10.37358/rc.19.7.7350.

Full text

Abstract:

Coinfections can alter the course and severity of different fish diseases. Suspensions of praziquantel (PZQ) and florfenicol (FFC ) based on sunflower oil can be an effective alternative for treating fish coinfections. The use of polyoxyethylene (20) sorbitan monooleate in the presence of ethoxylated castor oil in the preparation of PZQ and FFC suspensions has improved the stability of these suspensions. This PZQ and FFC preparation can be used in the treatment of parasitic/bacterial heterologous coinfections. The suspension of the PZQ and FFC preparation can be administered by water-diffusion, having a controlled release. The compounds are biodegradable and the route of administration remains safe for the environment.

APA, Harvard, Vancouver, ISO, and other styles

13

Moravec, Jiří, Tomáš Jirout, František Rieger, and Lukáš Krátký. "Mixing system for highly concentrated fine-grained suspensions." Polish Journal of Chemical Technology 11, no. 4 (January 1, 2009): 52–56. http://dx.doi.org/10.2478/v10026-009-0043-9.

Full text

Abstract:

Mixing system for highly concentrated fine-grained suspensions The mixing equipment for highly concentrated fine-grained suspensions must be designed differently from the equipment in which a suspension with a low concentration of the solid phase or bigger particles is mixed. It is due to the different rheological properties of the suspensions. In this work we are trying to find a suitable mixing system for a highly concentrated fine-grained suspension. The aim was to determine an effect of particular geometrical parameters of the tested mixing systems on a suspension process, especially from the energetic viewpoint. The energetic costs of all the used mixing systems were compared on the basis of the power consumption which was necessary for reaching the state of sufficient suspension movement in the whole mixed bulk. As a result, it was confirmed that multistage impellers can be used even in standard vessels (with a liquid level height equal to a vessel diameter) with a profit. During experiments, the state of sufficient movement was determined by a visual observation of the suspension at the vessel bottom, at the wall and also at the suspension level.

APA, Harvard, Vancouver, ISO, and other styles

14

Agafonov, Alexander V., Anton S. Kraev, Tatiana V. Kusova, Olga L. Evdokimova, Olga S. Ivanova, Alexander E. Baranchikov, Taisiya O. Shekunova, and Sergey A. Kozyukhin. "Surfactant-Switched Positive/Negative Electrorheological Effect in Tungsten Oxide Suspensions." Molecules 24, no. 18 (September 14, 2019): 3348. http://dx.doi.org/10.3390/molecules24183348.

Full text

Abstract:

The electrorheological (ER) effect was experimentally observed in dielectric suspensions containing tungsten oxide (WO3) modified with surfactant molecules (sodium dodecyl sulfate (SDS) and dodecylamine (DDA)) in electric fields up to several kilovolts per millimeter. The dielectric properties of WO3 suspensions in silicone oil were analyzed, depending on the frequency of the electric field, in the range from 25 to 106 Hz. Unmodified WO3 suspensions, as well as suspensions modified with sodium dodecyl sulfate, were shown to exhibit a positive electrorheological effect, whereas suspensions modified with dodecylamine demonstrated a negative electrorheological effect. The quantitative characteristics of the negative electrorheological effect in the strain–compression and shear regimes were obtained for the first time. Visualization experiments were performed to see the chain structures formed by WO3 particles modified with sodium dodecyl sulfate, as well as for dynamic electroconvection in electrorheological fluids containing WO3 modified with dodecylamine. The negative electrorheological effect was shown to be associated with the processes of phase separation in the electric field, which led to a multiplicative effect and a strong electroconvection of the suspension at field strengths above 1 kV/mm.

APA, Harvard, Vancouver, ISO, and other styles

15

Cañas, E., M. Vicent, M. J. Orts, R. Moreno, and E. Sánchez. "Bioactive glass suspensions preparation for suspension plasma spraying." Journal of the European Ceramic Society 36, no. 16 (December 2016): 4281–90. http://dx.doi.org/10.1016/j.jeurceramsoc.2016.06.011.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

SANCHEZ, JORGE, XIOMARA PINEDA, GERMAN QUINTANA, and ADRIANA P. HERRERA. "Rheological behavior of magnetic pulp fiber suspensions." June 2021 20, no. 6 (July 1, 2021): 393–403. http://dx.doi.org/10.32964/tj20.6.393.

Full text

Abstract:

This paper is focused on the rheology of magnetic pulp suspensions in absence and presence of an external magnetic field. Magnetic fibers were prepared by the lumen loading method using bleached eucalyptus fibers and cobalt ferrite (CoFe2O4) nanoparticles. The effect of mass consistency, temperature, concentration of magnetic fibers, and magnetic field strength on yield stress and apparent viscosity of the suspensions were investigated. In the absence of an applied field, a dependence of yield stress with consistency, as well as with the percentage of magnetic fibers present in the suspension, was found. In flow tests, all the suspensions exhibited shear-thinning behavior, showing that the viscosity is only affected by the consistency of the suspension. On the other hand, magnetorheological measurements show a negative effect of the applied magnetic field on the viscosity of the suspension.

APA, Harvard, Vancouver, ISO, and other styles

17

Wiśniewska, Małgorzata, Teresa Urban, Agnieszka Nosal-Wiercińska, Vladimir Zarko, and Vladimir Gun’ko. "Comparison of stability properties of poly(acrylic acid) adsorbed on the surface of silica, alumina and mixed silica-alumina nanoparticles — application of turbidimetry method." Open Chemistry 12, no. 4 (April 1, 2014): 476–79. http://dx.doi.org/10.2478/s11532-013-0401-6.

Full text

Abstract:

AbstractThe influence of anionic poly(acrylic acid) — PAA addition on the stability of synthesized silica, alumina and mixed silica-alumina suspensions as a function of solution pH was studied. The turbidimetry method was used to monitor the changes of the examined systems stability over time. The calculated stability coefficients enabled estimation of polymer adsorption influence on stability of metal oxide suspension. It was shown that the alumina suspension without the polymer is the most unstable at the pH values 6 and 9, whereas the silica polymer was most unstable at pH 3. PAA with higher molecular weight (240 000) is a relatively effective stabilizer of all investigated adsorbents (except silica at pH 3). These properties of poly(acrylic acid) are highly desirable in many branches of industry (e.g. production of cosmetics, pharmaceuticals, paints) where polymers are widely used as effective stabilizers of colloidal suspensions.

APA, Harvard, Vancouver, ISO, and other styles

18

Bozdogan, Ihsan, Muserref Onal, Abdullah Devrim Pekdemir, and Yuksel Sarikaya. "Thermodynamic Interpretation on the Rheology of Aqueous Bentonite Suspensions." Revista de Chimie 71, no. 6 (July 1, 2020): 51–58. http://dx.doi.org/10.37358/rc.20.6.8169.

Full text

Abstract:

Since their exceptional rheological behavior, bentonite suspensions are widely used in engineering, industrial, agricultural, and drilling applications. So, the aim of the present study is to investigate the rheological properties of three types aqueous suspensions prepared with calcium bentonite (CaB), sodium bentonite (NaB) obtained from that by Na2CO3 activation, and NaB with the excess soda. The CaB taken from Giresun/Turkey region contains calcium smectite (CaxS) as clay mineral and opal CT (SiO2.nH2O) as impurity which is paracrystalline silica. Soda content by the activation and bentonite content in the suspension were changed in the interval of 2.5-15.0% and 5-20% by mass, respectively. CaxS completely converted to sodium smectite (Na2xS) by the activation with the soda content of 2.5% and then Na2xS+Na2CO3 mixtures formed. Rheological properties of these aqueous suspensions were measured using a Fann Viscometer. These properties reached their maxima by the most thixotropic Na2xS suspensions and greatly increased with the increasing of smectite content. Rheological plots drawn of the shear rate vs. shear stress in the interval of 170-1020 s-1 showed that the suspensions flow as a Bingham Plastic. Change in rheological properties depending on the smectite type and content as well as excess soda content was explained thermodynamically based on the chemical potential gradient between interlayer and dispenser waters.

APA, Harvard, Vancouver, ISO, and other styles

19

Tukhbatullin, Adis A., Nadezhda A. Panova, Dim I. Galimov, Bulat M. Gareev, Alina A. Tukhbatullina, Kristina S. Vasilyuk, and Glyus L. Sharipov. "Application of Sonotriboluminescence to Determine Arene Molecules in Hydrocarbons." Molecules 28, no. 23 (December 4, 2023): 7932. http://dx.doi.org/10.3390/molecules28237932.

Full text

Abstract:

The sonotriboluminescence of suspensions of terbium(III) and europium(III) sulfates in decane without and in the presence of benzene, toluene and p-xylene was studied. The choice of crystals of these lanthanides is due to the fact that they have intense luminescence during mechanical action, and also do not dissolve in hydrocarbon solvents. During ultrasonic exposure to suspensions in pure alkanes, bands of Ln3+ ions and N2 in the UV region are recorded in the luminescence spectrum. When aromatic hydrocarbon molecules are added, bands of benzene, toluene and p-xylene molecules, coinciding with their photoluminescence spectra, are recorded in the sonotriboluminescence spectra in the UV region. The high sensitivity of the luminescence of suspensions to arene additives made it possible to obtain the dependence of the characteristic fluorescence of arene molecules in the sonotriboluminescence spectra on their concentration in suspensions. The limits of detection of benzene, toluene and p-xylene in the composition of this suspension were established. The lower limits of detection from the sonotriboluminescence spectra for xylene, toluene and benzene are 0.1, 3 and 50 ppmv, respectively. Fluorescence bands of these molecules were also recorded in the sonotriboluminescence spectra of suspensions in commercial dodecane and heptane with additives of commercial gasoline (up to 1%). The results obtained can be used for luminescent detection of aromatic compounds in saturated hydrocarbons.

APA, Harvard, Vancouver, ISO, and other styles

20

Oman, Srecko F., M. Filomena Camões, Kipton J. Powell, Raj Rajagopalan, and Petra Spitzer. "Guidelines for potentiometric measurements in suspensions Part B. Guidelines for practical pH measurements in soil suspensions (IUPAC Recommendations 2006)." Pure and Applied Chemistry 79, no. 1 (January 1, 2007): 81–86. http://dx.doi.org/10.1351/pac200779010081.

Full text

Abstract:

The measured cell potentials for suspension potentiometric cells have been interpreted and explained by a detailed analysis of the schemes for these cells ["Guidelines for potentiometric measurements in suspensions. Part A. The suspension effect (IUPAC Technical Report", Pure Appl. Chem.79, 67 (2007)]. Some former disagreements amongst investigations have been clarified. A new unambiguous operational definition of the suspension effect (SE) is presented. It is defined as the difference in cell potential for two suspension potentiometric cells, one with both electrodes in the separated equilibrium solution (eqs) and the other with both electrodes in the sediment or suspension. This potential difference is the sum of the change in the indicator electrode (IE) potential and the change in the liquid junction potential of the reference electrode (RE), when the electrodes are used for measurement, once in the sediment of the suspension and then in its eqs.

APA, Harvard, Vancouver, ISO, and other styles

21

Tokarová, Věnceslava, and Josef Mareček. "Determination of gallium in aluminium compounds by atomic absorption spectrometry." Collection of Czechoslovak Chemical Communications 53, no. 4 (1988): 756–62. http://dx.doi.org/10.1135/cccc19880756.

Full text

Abstract:

A method is suggested for the determination of gallium in aluminium oxide and in raw materials for its production (aluminium sulphates, alums) by atomic absorption spectrometry with electrothermal atomization, based on direct injection of a suspension of Al2O3 in an ethanol-water 9 : 1 mixture into a tungsten atomizer. Suspensions of Al2O3 with known amounts of Ga embedded in the solid phase are found to suit best for calibration. Optimum heat treatment and atomization conditions are established. The behaviour of gallium in aqueous solutions and in Al2O3 suspensions during their heat treatment is compared for atomization in a tungsten atomizer and in a graphite furnace.

APA, Harvard, Vancouver, ISO, and other styles

22

Leong, Yee‐Kwong, David V. Boger, and David Parris. "Surface chemistry and rheological properties of zirconia suspensions." Journal of Rheology 35, no. 1 (January 1991): 149–65. http://dx.doi.org/10.1122/1.550225.

Full text

APA, Harvard, Vancouver, ISO, and other styles

23

Johnson, Stephen B., George V. Franks, Peter J. Scales, David V. Boger, and Thomas W. Healy. "Surface chemistry–rheology relationships in concentrated mineral suspensions." International Journal of Mineral Processing 58, no. 1-4 (February 2000): 267–304. http://dx.doi.org/10.1016/s0301-7516(99)00041-1.

Full text

APA, Harvard, Vancouver, ISO, and other styles

24

Pugh, R. J., and L. Bergström. "Surface and solution chemistry studies on galena suspensions." Colloids and Surfaces 19, no. 1 (January 1986): 1–20. http://dx.doi.org/10.1016/0166-6622(86)80032-4.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

Paugh, R. J., and l. Bergström. "Surface and solution chemistry studies on galena suspensions." Colloids and Surfaces 19, no. 2-3 (August 1986): 421. http://dx.doi.org/10.1016/0166-6622(86)80351-1.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

de Kretser, Ross G., Peter J. Scales, and David V. Boger. "Surface chemistry-rheology inter-relationships in clay suspensions." Colloids and Surfaces A: Physicochemical and Engineering Aspects 137, no. 1-3 (June 1998): 307–18. http://dx.doi.org/10.1016/s0927-7757(97)00372-5.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

Yaghtin, Amirhossein, Maryam Yaghtin, Pooria Najafisayar, Zhaolin Tang, and Tom Troczynski. "On the Applicability of Modified Water-Based Yttria-Stabilized Zirconia Suspensions to Produce Plasma-Sprayed Columnar Coatings." Coatings 13, no. 8 (July 28, 2023): 1330. http://dx.doi.org/10.3390/coatings13081330.

Full text

Abstract:

In this paper, the applicability of the modified water-based yttria-stabilized zirconia (YSZ) suspensions, including different dispersants, to produce plasma-sprayed coatings with a “columnar microstructure” is investigated. The effects of processing parameters, like the suspension liquid-phase ethanol content, change in substrate roughness, and spray distance on the resulting coating morphologies, are investigated. The results showed that increasing the ethanol concentration, substrate surface roughness, and spray distance promotes the formation of coatings with a columnar structure. Moreover, the application of modified water-based suspensions, including the α-Terpineol dispersant, has led to the deposition of columnar coatings with comparable morphologies of coatings deposited from ethanol-based suspensions.

APA, Harvard, Vancouver, ISO, and other styles

28

Stojiljkovic, S., V. Miljkovic, G. Nikolic, D. Kostic, B. Arsic, J. Barber, I. Savic, and I. Savic. "The influence of the addition of polymers on the physico-chemical properties of bentonite suspensions." Science of Sintering 46, no. 1 (2014): 65–73. http://dx.doi.org/10.2298/sos1401065s.

Full text

Abstract:

Bentonite clays have many applications in industries ranging from construction to cosmetics. Addition of polymers can profoundly influence the properties of bentonite suspensions and we now describe the influence of a range of different polymers. Whereas polyvinyl pyrolidone and soy isolate only slightly influenced the pH and the electrical conductivity of bentonite polymers in suspension, Carbopol solution caused decreases in both pH and electrical conductivity. As expected, strong electrolytes like sodium chloride caused big changes in the electrical conductivity of the suspensions. When the temperature of the bentonite suspensions was increased, the pH was almost unchanged, but the electrical conductivity increased. Bentonite treated with polymer suspensions can be used in purifying polluted water; for example, our results suggest that high pH caused by phosphorous salts can be addressed using bentonite modified with Carbopol.

APA, Harvard, Vancouver, ISO, and other styles

29

Shelukhin, Vladimir. "Flows of Linear Polymer Solutions and Other Suspensions of Rod-like Particles: Anisotropic Micropolar-Fluid Theory Approach." Polymers 13, no. 21 (October 25, 2021): 3679. http://dx.doi.org/10.3390/polym13213679.

Full text

Abstract:

We formulate equations governing flows of suspensions of rod-like particles. Such suspensions include linear polymer solutions, FD-virus, and worm-like micelles. To take into account the particles that form and their rotation, we treat the suspension as a Cosserat continuum and apply the theory of micropolar fluids. Anisotropy of suspensions is determined through the inclusion of the microinertia tensor in the rheological constitutive equations. We check that the model is consistent with the basic principles of thermodynamics. In addition to anisotropy, the theory also captures gradient banding instability, coexistence of isotropic and nematic phases, sustained temporal oscillations of macroscopic viscosity, shear thinning and hysteresis. For the flow between two planes, we also establish that the total flow rate depends not only on the pressure gradient, but on the history of its variation as well.

APA, Harvard, Vancouver, ISO, and other styles

30

Coteț, Liviu Cosmin, C. Sălăgean, Alin Grig Mihis, István-Attila Székely, Zsejke-Réka Tóth, Lucian Baia, Monica Baia, Gabriela Olteanu, Iulian Daniel Olteanu, and Virginia Danciu. "Suspension Based on a Mixture of Titania-Silica-Functionalized Graphene Oxide for Surface Consolidation of Historical Andesite Stone and Mortar." Studia Universitatis Babeș-Bolyai Physica 67, no. 1-2 (December 30, 2022): 55–77. http://dx.doi.org/10.24193/subbphys.2022.06.

Full text

Abstract:

"Three-components suspension, based on a mixture of titania (TiO2)-silica (SiO2)-functionalized graphene oxide (GO) is prepared and used for surface consolidation of historical andesite stone and mortar. For comparison, mono- and bi-component suspensions are also involved in this study. In order to increase the attachment capacity of GO to substrate with silicon, GO functionalized with (3-aminopropyl) triethoxysilane (GO-APTES) was involved. Unmodified and modified by painting with prepared suspensions andesite and mortar samples were investigated by microscopy (Optic and SEM-EDX), XRD, FT-IR and Raman spectra before and after 6 months of exposure to ambient conditions. After investigation, even the amount of used consolidant suspension was low, the stability of the modified samples was found that remains constant and in a long time it is possibly to reach even a higher stability level. This approach provides the idea that the prepared suspension could be an interesting option to be involved in stone and mortar consolidation-restoration field. Keywords: titanium oxide, cultural heritage, functionalized graphene oxide, surface consolidation, historical stones, historical mortars. "

APA, Harvard, Vancouver, ISO, and other styles

31

Kroupa, Martin, Miroslav Soos, and Juraj Kosek. "Slip on a particle surface as the possible origin of shear thinning in non-Brownian suspensions." Physical Chemistry Chemical Physics 19, no. 8 (2017): 5979–84. http://dx.doi.org/10.1039/c6cp07666a.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

Chui, Jane Y. Y., Carine Douarche, Harold Auradou, and Ruben Juanes. "Rheology of bacterial superfluids in viscous environments." Soft Matter 17, no. 29 (2021): 7004–13. http://dx.doi.org/10.1039/d1sm00243k.

Full text

Abstract:

Dense suspensions of pusher-type bacteria give rise to 'superfluids' in which the effective viscosity of the suspension is drastically reduced through collective motion, and in this study we investigate how a viscous environment affects this behavior.

APA, Harvard, Vancouver, ISO, and other styles

33

Danilov, Egor A., Mikhail Veretennikov, Maria Dronova, Timofey Kalyakin, Andrey A. Stepashkin, Victor V. Tcherdyntsev, and Vladimir Samoilov. "Simple Route to Increase Electrical Conductivity and Optical Transmittance in Graphene/Silver Nanoparticles Hybrid Suspensions." Applied Sciences 13, no. 3 (February 2, 2023): 1922. http://dx.doi.org/10.3390/app13031922.

Full text

Abstract:

Electrical and optical properties of graphene/silver nanoparticles hybrid suspensions intended for use in inkjet printing technologies were studied. Few-layered graphene particles were manufactured via a direct ultrasonic-assisted liquid-phase exfoliation route in water/surfactant system, whereas silver nanoparticles were synthetized using a polyol process. Hybrid suspensions for graphene/silver nanoparticles mixtures showed significant reduction in mean particle size while electrical conductivity remained almost intact even after thorough centrifugation. Structuring effects in mixed colloids were very pronounced as both electrical conductivity and optical transmission showed maxima at 65 wt.% graphene. Suspensions with conductivities above 300 μSm/cm, much higher than previously reported, were obtained, and resulted in the manufacturing of films with less than 10% optical absorption throughout the visible region. These samples did not demonstrate absorption peaks attributed to silver nanoparticles’ surface plasmon resonance, which is suitable for transparent electrode applications. Suspension properties at optimal composition (65 wt.% graphene) are very promising for printed electronics as well as transparent conductive coating applications. In the paper, we establish that the optimal suspension composition matches that of the film; therefore, more attention should be paid to carefully studying electrically conductive suspensions.

APA, Harvard, Vancouver, ISO, and other styles

34

Ackerson, B. J., X. L. Lei, and P. Tong. "Subtle order in settling suspensions." Pure and Applied Chemistry 73, no. 11 (January 1, 2001): 1679–88. http://dx.doi.org/10.1351/pac200173111679.

Full text

Abstract:

A dilute suspension of uniform, non-Brownian spheres settles slowly in a viscous solvent. The initially well-mixed system showing Poisson or random occupancy statistics evolves to a system having reduced number fluctuations, but otherwise appearing random. The reduced number fluctuations are consistent with recent measurements of velocity fluctuations in settling suspensions. These experimental results test the assumptions leading to the theoretical predictions by Calflisch and Luke that the velocity fluctuations increase without limit with increasing sample dimension. The theoretical prediction assumes Poisson occupation statistics contrary to our observations.

APA, Harvard, Vancouver, ISO, and other styles

35

Morris, Gayle E., William A. Skinner, Peter G. Self, and Roger St C. Smart. "Surface chemistry and rheological behaviour of titania pigment suspensions." Colloids and Surfaces A: Physicochemical and Engineering Aspects 155, no. 1 (September 1999): 27–41. http://dx.doi.org/10.1016/s0927-7757(98)00631-1.

Full text

APA, Harvard, Vancouver, ISO, and other styles

36

LIU, LINGYUN, YANG HU, FANFEI MIN, MINGXU ZHANG, and SHAOXIAN SONG. "CHARACTERIZATIONS AND STABILITY OF COLLOIDAL COAL-MEASURE KAOLINITE IN AQUEOUS SUSPENSIONS: A REVIEW." Surface Review and Letters 20, no. 01 (February 2013): 1330001. http://dx.doi.org/10.1142/s0218625x13300013.

Full text

Abstract:

Coal-measure kaolinite is a main gangue mineral in coal deposits. Because of the colloidal particle size, the kaolinite is very stable in coal tailing slurries, leading to a high turbidity of recycled water in coal washing plants. The coagulation of colloidal kaolinite in aqueous suspensions is an essential problem in many coal washing plants. This review highlights the characterizations and stability of colloidal coal-measure kaolinite in aqueous suspensions. The characterizations include mineralogy, electrokinetics and hydration layers on kaolinite surfaces. The coagulation of colloidal kaolinite in aqueous suspensions is reviewed and discussed on the basis of the DLVO theory and the characterization. In addition,the main parameters of affecting the coagulation, such as suspension pH, electrolytic ions and temperature, are summarized.

APA, Harvard, Vancouver, ISO, and other styles

37

Kovalchuk, N. M., I. Kuchin, V. Starov, and N. Uriev. "Aggregation in colloidal suspensions and its influence on the suspension viscosity." Colloid Journal 72, no. 3 (June 2010): 379–88. http://dx.doi.org/10.1134/s1061933x10030117.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

Bhatty, Javed I., K. J. Reid, D. Dollimore, T. H. Shah, G. A. Gamlen, and A. Tamimi. "Suspensions and Sediments. Part II. Behavior of Concentrated Suspensions." Separation Science and Technology 24, no. 3-4 (March 1989): 165–78. http://dx.doi.org/10.1080/01496398908049761.

Full text

APA, Harvard, Vancouver, ISO, and other styles

39

Megatif, Dillert, and Bahnemann. "Reaction Rate Study of the Photocatalytic Degradation of Dichloroacetic Acid in a Black Body Reactor." Catalysts 9, no. 8 (July 25, 2019): 635. http://dx.doi.org/10.3390/catal9080635.

Full text

Abstract:

The light-induced degradation of dichloroacetic acid in aqueous suspensions containing the TiO2 photocatalyst Hombikat UV 100 was investigated. The reactions were performed in a black body reactor in which the rate of conversion, defined as the time derivative of the extent of conversion, is not affected by the light scattering properties of the photocatalysts. At sufficiently high concentrations of both the probe compound and the photocatalyst the rate of conversion was found to be unswayed by the initial concentration of the probe compound, the mass concentration of the photocatalyst, and the suspension volume. Thus, the chosen experimental conditions enable the determination of the rate of conversion and the quantum yield of the light induced degradation of dichloroacetic acid in aqueous photocatalyst suspension with sufficiently good reproducibility. The experimental procedure employed here seems to be generally applicable to determine rates of conversion and quantum yields that possibly allow a comparison of the activities of photocatalysts in aqueous suspensions.

APA, Harvard, Vancouver, ISO, and other styles

40

Zhou, Can, Shoubin Zhang, Taoran Hui, Qiuhong Cui, and Yuandu Hu. "Microfluidics-Assisted Fabrication of Dual Stopband Photonic Microcapsules and Their Applications for Anticounterfeiting." Polymers 14, no. 19 (September 22, 2022): 3954. http://dx.doi.org/10.3390/polym14193954.

Full text

Abstract:

The assembly of two different kinds of colloidal particle-based photonic structures into an individual micro-object can achieve multifunctionality. In this study, core–shell photonic microcapsules with dual structural colors and photonic stop bands were prepared through a standard microfluidic technique. Photocurable resin suspension of silica nanoparticles and an aqueous suspension of nanogels were used as shell and core parts of microcapsules, respectively. The structural colors of shells and cores can be tuned by adjusting the concentrations of silica nanoparticles and soft nanogels in their corresponding suspensions. The individual microcapsules possess two distinct stop bands when the two suspensions are combined appropriately. Remarkably, the color information of the core part cannot be directly viewed at a macroscopic level (such as visual inspection) but can be detected at a microscopic scale (such as optical microscopy observation). The color information hidden enables the capability for information encryption and has potentially critical applications in anti-counterfeiting, display, and other fields.

APA, Harvard, Vancouver, ISO, and other styles

41

Lazic, Marija, Kornelija Simovic, Vesna Miskovic-Stankovic, Predrag Jovanic, and Dusan Kicevic. "The influence of the deposition parameters on the porosity of thin alumina films on steel." Journal of the Serbian Chemical Society 69, no. 3 (2004): 239–49. http://dx.doi.org/10.2298/jsc0403239l.

Full text

Abstract:

The influence of the deposition parameters on the porosity of thin alumina films electrophoretically deposited on steel from aqueous suspensions was investigated. The effects of the applied voltage, deposition time, suspension temperature and the solid content of the aqueous suspension on the porosity of the obtained alumina films have been determined using optical microscopy coupled with image analysis. It was shown that the lowest film porosity was obtained from a suspension containing 20 wt.% alumina powder at the lowest applied voltage (30 V), for a longer deposition time (10 min) using a suspension temperature of 30 ?C. This behavior can be explained by the smaller amount of hydrogen evolved on the cathode during the electrophoretic deposition process.

APA, Harvard, Vancouver, ISO, and other styles

42

Lopez-Avila, Viorica, Richard Young, and Werner F. Beckert. "Stability of Organic Pollutants During Microwave-Assisted Extraction from Solid Matrixes." Journal of AOAC INTERNATIONAL 81, no. 2 (March 1, 1998): 462–76. http://dx.doi.org/10.1093/jaoac/81.2.462.

Full text

Abstract:

abstract A stability study was conducted for 95 semivolatile organics listed in U.S. Environmental Protection Agency Method 8250 (this number includes 6 surrogate compounds). These compounds were spiked into solvent only [hexane-acetone (1 +1), methylene chloride-acetone (1 +1), toluenemethanol (10 + 1), and methyl ferf-butyl ether], solvent/dry soil suspensions, and solvent/wet soil suspensions [20% water (w/w)] and heated with microwave energy in closed vessels at 50° or 145° C for 5 or 20 min. For comparison and to determine nitrogen blowdown losses, spiked solvent samples that had not been exposed to microwave energy were concentrated by the blowdown technique and analyzed for each of the spiked compounds. Hexane-acetone (1+1) seems to be the best for the compounds and matrixes investigated, with recoveries > 80%, except for basic compounds and benzoic acid in the solvent/dry soil suspension experiments. Increasing extraction time from 5 to 20 min did not increase recoveries; in fact, recoveries of neutral compounds decreased slightly at the longer extraction time. Increasing the temperature from 50° to 145° C decreased recoveries of basic compounds by about 10%. Recoveries of basic compounds, of benzoic acid (and probably other organic acids as well), and at least to some extent of phenolic compounds from the solvent/wet soil suspensions were higher than those for solvent/dry soil suspensions.

APA, Harvard, Vancouver, ISO, and other styles

43

Lapekin, Nikita I., Tatyana V. Anufrieva, Arina V. Ukhina, Artem A. Shestakov, and Alexander G. Bannov. "Solvent effect on the NO<sub>2</sub> sensing properties of multi-walled carbon nanotubes." Chimica Techno Acta 9, no. 3 (August 8, 2022): 20229311. http://dx.doi.org/10.15826/chimtech.2022.9.3.11.

Full text

Abstract:

This article is devoted to the investigation of the influence of the solvent on sensing properties, such as response and recovery rate, of chemiresistive gas sensors. Multi-walled carbon nanotubes were used as an active material for the sensors. The initial material was investigated by scanning electron spectroscopy and transmission electron microscopy, low-temperature nitrogen adsorption, Raman spectroscopy, and X-ray diffraction. The active material was produced by drop casting. Different polar solvents (acetone and ethanol) were used for suspension preparation. Textolite with copper contacts on the edges of one side was used as a sensor substrate. The gas sensing properties (the response and the recovery time) were investigated in the range of 100–500 ppm NO2 at room temperature. The films made using different solvent suspensions showed high sensitivity and rapid recovery rate to nitrogen dioxide. It was found that the method of film preparation has an effect on the measured sensing properties. The films prepared using different suspensions possessed different properties: the film made from the acetone suspension had the response values from 8.49% to 20.26%, and the recovery values from 0.06%/min to 0.16%/min. The response of the film made from the ethanol suspension increased , being from 12.25% to 23.63%; the recovery rate were also increased (from 0.19%/min to 0.39%/min).

APA, Harvard, Vancouver, ISO, and other styles

44

BECK, STEPHANIE, and JEAN BOUCHARD. "Ionic strength control of sulfated cellulose nanocrystal suspension viscosity." TAPPI Journal 15, no. 6 (July 1, 2016): 363–72. http://dx.doi.org/10.32964/tj15.6.363.

Full text

Abstract:

The effect of added electrolyte on the viscosity behavior of 3–9 wt% cellulose nanocrystals (CNC) suspensions was investigated for three different grades of CNCs extracted from wood pulp with sulfuric acid at increasing hydrolysis temperature. The viscosity of aqueous CNC suspensions decreases significantly when small amounts of electrolyte are added because of a reduction in electroviscous effects caused by compression of the electrical double layer surrounding the particles. As the ionic strength increases further, the suspension viscosity reaches a minimum and then increases again with the formation of an attractive gel.

APA, Harvard, Vancouver, ISO, and other styles

45

Kalinina, Elena, and Maxim Ivanov. "The Electrophoretic Deposition of Nanopowders Based on Yttrium Oxide for Bulk Ceramics Fabrication." Inorganics 10, no. 12 (December 6, 2022): 243. http://dx.doi.org/10.3390/inorganics10120243.

Full text

Abstract:

In the present work, a study was carried out to investigate the key factors that determine the uniformity, mass, thickness, and density of compacts obtained from nanopowders of solid solutions of yttrium and lanthanum oxides ((LaxY1−x)2O3) with the help of the electrophoretic deposition (EPD). Nanopowders were obtained by laser ablation of a mixture of powders of yttrium oxide and lanthanum oxide in air. The implemented mechanisms of the EPD and factors of stability of alcohol suspensions are analyzed. It has been shown that acetylacetone with a concentration of 1 mg/m2 can be used as a dispersant for stabilization of isopropanol suspensions of the nanoparticles during the EPD. It was shown that the maximum density of dry compacts with a thickness of 2.4 mm reaches 37% of theoretical when EPD is performed in vertical direction from a suspension of nanopowders with addition of acetylacetone.

APA, Harvard, Vancouver, ISO, and other styles

46

Du, Mingyong, Jishan Liu, Peta L. Clode, and Yee-Kwong Leong. "Surface chemistry, rheology and microstructure of purified natural and synthetic hectorite suspensions." Physical Chemistry Chemical Physics 20, no. 28 (2018): 19221–33. http://dx.doi.org/10.1039/c8cp01382a.

Full text

APA, Harvard, Vancouver, ISO, and other styles

47

Rohela, Gulab Khan, Prasad Bylla, Sreenu Pendli, Rajender Korra, Rajender Gandu, and Christopher Reuben. "High performance liquid chromatography based quantification of reserpine in Rauwolfia tetraphylla L. and enhanced production through precursor feeding." Acta Chromatographica 34, no. 2 (September 7, 2021): 120–29. http://dx.doi.org/10.1556/1326.2021.00888.

Full text

Abstract:

Abstract Rauwolfia tetraphylla L., is an important medicinal plant in Apocynaceae family and is recognized as an alternative source to Rauwolfia serpentina L., in terms of anti-hypertensive alkaloid production i.e. reserpine. In view of this, the present study is conducted to estimate the reserpine content in different parts (leaf, stem and root) of field grown plants (2 years old), tissue cultured plantlets (R1) (two months old) and cell suspensions cultures (two months old with and without precursor feeding) of R. tetraphylla by using high performance liquid chromatography (HPLC) technique. Overall maximum content of reserpine (in %) was estimated from the root samples. Roots of field grown plants has recorded high percent of reserpine (0.39%) followed by roots of tissue cultured plantlets (0.35%) and root callus based cell suspension cultures (0.38 %) which was fed with precursor amino acid (100 mg/L of tryptophan). In control type of root callus based cell suspension cultures, reserpine content was quantified as 0.14%; by precursor feeding (100 mg/L of tryptophan) it was enhanced to 0.38%. In conclusion, the reserpine content (0.35 and 0.38%) produced by the roots of tissue cultured plantlets (R1) and 100 mg/L tryptophan fed root callus based cell suspensions was comparable to that of the reserpine content (0.39%) of root parts of field grown plants. The present study demonstrates the reserpine production by in vitro cell suspension cultures throughout the year without sacrificing the medicinal plants.

APA, Harvard, Vancouver, ISO, and other styles

48

Begea, Mihaela, Iuliana Diana Barbulescu, Lacramioara Popa, Carmen Otilia Rusanescu, Madalina Georgiana Albu Kaya, Razvan Ionut Teodorescu, Simona-Ioana Marinescu, et al. "Novel Assessment Method of the Critical Parameters for Brewing Yeast Formulation as a Nutraceutical in Animal Diets." Revista de Chimie 71, no. 2 (March 3, 2020): 167–74. http://dx.doi.org/10.37358/rc.20.2.7911.

Full text

Abstract:

Brewing yeast biomasses may be converted into valuable products, including supplements for ruminant diets. This paper presents experimental data on a nutraceutical suspension formulation containing post-fermentation brewing yeasts and the brewing yeast strain, Saccharomyces pastorianus ssp. carlsbergensis W34/70, which was intended to be administered to ruminants. The brewing yeast biomass is a component of oral suspensions designed as dietary supplements that prevent digestive acidosis in ruminants. The brewing yeast strain W34/70 was cultivated using molasses (M) and glucose (G) as carbon sources and was lyophilized at different freezing temperatures (0�C, �10�C, �20�C, �30�C, and �40�C). The post-fermentation brewing yeast biomass was spray dried (AAY) and lyophilized (ALY). Both dried yeast biomasses were analyzed in terms of wettability using a contact angle (CA�) evaluation at the solid/liquid interface. Suspensions were subsequently formulated and tested. Their physical and aggregative stability was established in connection with controlled sedimentation and flocculation. The assays were performed following quality by design (QbD) principles. The critical process parameters (CPPs) corresponding to the technological process of yeast production, as well as the critical quality attributes (CQAs) for suspension formulations, were pointed out as preamble determinants when designing oral nutraceuticals destined to be included in ruminant diets.

APA, Harvard, Vancouver, ISO, and other styles

49

L�wen, H., and M. Schmidt. "Freezing in confined suspensions." Progress in Colloid & Polymer Science 104, no. 1 (December 1997): 81–89. http://dx.doi.org/10.1007/bf01182418.

Full text

APA, Harvard, Vancouver, ISO, and other styles

50

Matson, W. R., B. J. Ackerson, and P. Tong. "Dynamics of rotating suspensions." Solid State Communications 139, no. 11-12 (September 2006): 605–16. http://dx.doi.org/10.1016/j.ssc.2006.04.041.

Full text

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Suspensions, chemistry'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles