マジェリカ・ジャパン List of Products and Services

We would like to introduce a case study conducted by Majelica Japan Co., Ltd., which experimentally demonstrated the feasibility of easily comparing setting times using pulse NMR. Two types of dispersions were prepared: one with water added to achieve 50wt% cement, and the other with a cement setting retardant added. The viscosity and relaxation time T1 of each were measured at 60°C. The dispersion with the setting retardant showed an initial viscosity in the low shear region that was about ten times greater, while the initial relaxation time was shorter for the dispersion containing only cement and water. [Experiment] - Two types of dispersions were prepared: one with water added to achieve 50wt% cement, and the other with a cement setting retardant added. - The viscosity and relaxation time T1 of each were measured at 60°C. *For more details, please refer to the PDF document or feel free to contact us.

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We would like to introduce a case where the relaxation time T2 was measured using our "TD-NMR Spectrometer Spin track." The bread was carefully torn into small pieces using tweezers and packed into a glass sample tube without crushing it. As a result, the relaxation time was obtained from three components, and it was found that both bread A and B consist of three components with different mobilities. Additionally, it was possible to quantify and compare the relaxation times and intensity ratios. 【Features】 ■ Experiment - The bread was torn into small pieces using tweezers and packed into a glass sample tube. - The relaxation time T2 (CPMG method) was measured using TD-NMR. ■ Results - The relaxation time was obtained from three components, and both bread A and B consist of three components with different mobilities. ■ Discussion - The differences in the softness of the bread were quantified and compared using the relaxation times and intensity ratios. *For more details, please refer to the PDF document or feel free to contact us.

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We would like to introduce a case study conducted by Majerika Japan Co., Ltd., where the relaxation time T2 of a sample made by dissolving gelatin in water and gelating it through cooling was measured. Gelatin was dissolved in warm water at concentrations of 1%, 2.5%, 5%, 10%, and 20%, cooled in a refrigerator for 30 minutes, and gelated. Measurements were taken immediately after removal using TD-NMR. As a result, it was found that as the concentration increased, the relaxation time decreased, and the relaxation time was obtained as a single component for concentrations ranging from 1% to 20%. [Case Summary] ■ Experiment - Gelatin was dissolved in warm water at concentrations of 1%, 2.5%, 5%, 10%, and 20% - Cooled in a refrigerator for 30 minutes and gelated - Measured immediately after removal from the refrigerator using TD-NMR ■ Results - As the concentration increased, the relaxation time decreased - The relaxation time was obtained as a single component for concentrations ranging from 1% to 20% *For more details, please refer to the PDF document or feel free to contact us.

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We would like to introduce a case study by Majerika Japan Co., Ltd., where particles were dispersed in actual resin at the same concentration as the product, and the relaxation time was measured to compare the wettability of the powders. Silica-based fillers A and B were mixed with a light-curing resin (160 mP-s) at a particle concentration of over 50 wt%. They were dispersed using a public rotary stirring and defoaming device, the Kakuhunter SK-400TR. As a result, even for samples dispersed in a high-viscosity medium, we were able to quantify the differences at the particle interface. 【Case Summary】 ■ Experiment - Mixed silica-based fillers A and B with light-curing resin at a particle concentration of over 50 wt%. - Dispersed using the Kakuhunter SK-400TR. - Measured relaxation time with the MagnoMeter SED VT and compared the wettability of powders A and B. ■ Discussion - Even for samples dispersed in a high-viscosity medium, we were able to quantify the differences at the particle interface. *For more details, please refer to the PDF document or feel free to contact us.

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We present a case study conducted by Majerika Japan Co., Ltd., measuring the relaxation times of carbon black immediately after dispersion and one day later. Carbon black was added to a dispersion medium mixed with NMP and PVDF to achieve a concentration of 30 wt%. The relaxation times of four types of dispersions with different stirring conditions were measured using the "MagnoMeter SED." As a result, even with high concentration and black samples, we were able to quantify and compare the dispersibility without dilution. 【Case Overview】 ■ Experiment - Carbon black was added to a dispersion medium mixed with NMP and PVDF to achieve a concentration of 30 wt%. - Dispersion was carried out using a public rotary stirring and degassing device, the Kakuhunter SK-400TR. - The relaxation times of four types of dispersions with different stirring conditions were measured. ■ Discussion - Even with high concentration and black samples, we were able to quantify and compare the dispersibility without dilution. *For more details, please refer to the PDF document or feel free to contact us.

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We would like to introduce a case study conducted by Majelica Japan Co., Ltd. regarding which of the two types of additives adsorbs particles. Inorganic particles 1 and 2 were dispersed in water, and additives A and B were added to measure the relaxation time. By measuring the relaxation time, it was confirmed that even with the same additive, the adsorption characteristics differ depending on the type of particle. 【Case Summary】 ■ Experiment - Inorganic particles 1 and 2 were dispersed in water, and additives A and B were added to measure the relaxation time. - The Rsp values were calculated from the obtained relaxation times. - The Rsp values were compared as values per unit volume. ■ Discussion - By measuring the relaxation time, it was confirmed that even with the same additive, the adsorption characteristics differ depending on the type of particle. *For more details, please refer to the PDF document or feel free to contact us.

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We would like to introduce a case study conducted by Majerika Japan Co., Ltd. that explored the dispersion endpoint of a concentrated slurry of barium titanate processed with a bead mill. Using a disperser, barium titanate was dispersed in a toluene-ethanol mixed solvent, and measurements were taken at various processing times to verify the results. From measurements using a rheometer, it was estimated that the over-dispersion boundary is 25.1 mm, and sedimentation velocity distribution measurements revealed that a significant amount of coarse particles were present after 33.4 minutes. 【Case Summary】 ■ Experiment - Relaxation time was measured using pulse NMR. - Viscosity and dynamic viscoelasticity were measured using a rheometer to determine the over-dispersion boundary and conditions for good dispersibility. - Sedimentation velocity distribution was determined using a centrifugal dispersion and particle size distribution measurement device. ■ Results - The over-dispersion boundary was estimated to be 25.1 mm. - It was found that a significant amount of coarse particles were present after 33.4 minutes. *For more details, please refer to the PDF document or feel free to contact us.

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We would like to introduce a measurement case using graphite by Majerika Japan Co., Ltd. An experiment was conducted to compare the dispersion degree in a concentrated state with the particle size distribution measured after dilution. Under the current conditions, it was suggested that the ball mill disperses to primary particles at high concentrations. Additionally, the relaxation time was obtained as a two-component system for all dispersions, and the dispersion degree calculated from the relaxation time was good at 20 wt%. 【Case Overview】 ■ Experiment - Graphite was dispersed in distilled water with a dispersant added. - Dispersed for 15 minutes using a planetary ball mill PL-7 (manufactured by Fritsch, Germany). - Relaxation time T2 was measured using the CPMG method. ■ Results - It was suggested that the ball mill disperses to primary particles at high concentrations. - The relaxation time was obtained as a two-component system for all dispersions. - The dispersion degree calculated from the relaxation time was good at 20 wt%. *For more details, please refer to the PDF document or feel free to contact us.

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We would like to introduce a case study by Majelica Japan Co., Ltd. that compares the wettability using powders with significantly different interfacial properties. Water droplets were dropped on the powders before and after surface treatment to compare their wettability. Additionally, the relaxation times were measured when each was dispersed in distilled water and hexane. It was suggested that the wettability worsened in distilled water due to a decrease in Rsp from surface treatment, while the wettability improved in hexane due to an increase in Rsp from surface treatment. [Case Summary] ■ Experiment - Dropped water droplets on powders before and after surface treatment - Measured relaxation times when dispersed in distilled water and hexane ■ Results - Distilled Water: Suggested that wettability worsened due to a decrease in Rsp - Hexane: Suggested that wettability improved due to an increase in Rsp *For more details, please refer to the PDF document or feel free to contact us.

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We would like to introduce a case study conducted by Majerika Japan Co., Ltd., where six types of powders with different lots were dispersed in distilled water, and relaxation time measurements were performed. The six types of powders were dispersed in water at the same concentration (10 wt%) and subjected to ultrasonic dispersion for 10 minutes, followed by relaxation time measurements. When the relationship between the BET specific surface area and the calculated specific surface area from the relaxation time was graphed, it was represented by two straight lines rather than a single correlation line. This suggests the presence of two types of powders with different chemical properties. 【Case Summary】 ■ Experiment - Six types of powders were dispersed in water at the same concentration (10 wt%). - Ultrasonic dispersion was performed for 10 minutes, followed by relaxation time measurements. ■ Results - The presence of two types of powders with different chemical properties was suggested. *For more details, please refer to the PDF document or feel free to contact us.

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We would like to introduce a case where SDS was added at concentrations of 0%, 1%, 3%, and 5% to dispersions of colloidal silica with and without 1% PVP adsorbed. When SDS was added to the colloidal silica with 1% PVP, the Rsp value decreased as the concentration increased, approaching the Rsp value of the dispersion containing only colloidal silica. It was suggested that PVP and SDS have a stronger binding force than silica, and that SDS has the property of chemically bonding with PVP, causing PVP to detach from silica. 【Case Summary】 ■ Experiment - SDS was added at concentrations of 0%, 1%, 3%, and 5% to dispersions of colloidal silica with and without 1% PVP adsorbed. ■ Results - The Rsp value decreased when SDS was added to the colloidal silica with 1% PVP. - It approached the Rsp value of the dispersion containing only colloidal silica. *For more details, please refer to the PDF document or feel free to contact us.

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We would like to introduce a case study conducted by Majerika Japan Co., Ltd. to predict the optimal amount of dispersant by measuring relaxation time. Dispersants (PVP: nonionic polymer) were added to colloidal silica at concentrations of 0%, 1%, 2%, 3%, and 4%, and relaxation time measurements were carried out. When using water as the bulk liquid, the Rsp value tended to continue increasing, but when using the supernatant obtained from a ultracentrifuge, the Rsp value reached a steady state. 【Case Summary】 ■ Experiment - Dispersants were added to colloidal silica, and relaxation time measurements were conducted. ■ Results - Using the supernatant obtained from the ultracentrifuge as the bulk liquid resulted in the Rsp value reaching a steady state. *For more details, please refer to the PDF document or feel free to contact us.

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We would like to introduce a case study conducted by Majerika Japan Co., Ltd. regarding the measurement of the raw material of sunscreen cream. To determine the suitable pressure for the jet mill, we measured the viscosity and relaxation time of the sunscreen cream. The relaxation time was converted to dispersion degree (%) for comparison. A correlation was obtained between viscosity and dispersion degree. With pulse NMR, even at high concentrations, the dispersion endpoint can be evaluated in a short time simply by transferring it directly into the NMR tube without dilution. 【Case Overview】 ■ Experiment - The raw material of the sunscreen cream was extracted, and TD-NMR measurements were conducted. ■ Results - The relaxation time was converted to dispersion degree (%) for comparison. - A correlation was obtained between viscosity and dispersion degree. *For more details, please refer to the PDF document or feel free to contact us.

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We offer the 'MagnoMeter SED VT', which allows for particle interface evaluation using pulse NMR. By measuring relaxation time, even small differences in particle interfaces can be quantified with good reproducibility in a short time. Additionally, while measuring relaxation time may seem difficult, it can be easily used by anyone, just like a particle size distribution measurement device. 【Applications】 ■ Evaluation of dispersion and aggregation states ■ Assessment of powder wettability and interfaces ■ Evaluation of dispersant adsorption characteristics ■ Relative comparison of specific surface area and determination of dispersion endpoint ■ Calculation of Hansen Solubility Parameters (HSP) *For more details, please download the PDF or feel free to contact us.

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We handle the pulse NMR measurement device 'MagnoMeter XRS', which allows for the measurement of relaxation times to quantify even slight differences with good reproducibility in a short time. Since it uses radio waves instead of light, it can measure samples in their original state, even if they are black and concentrated, without dilution. Additionally, if the dispersion medium contains hydrogen nuclei (protons, 1H), evaluation is possible. 【Applications】 ■ Evaluation of dispersion and aggregation states ■ Evaluation of wettability and interfacial properties of powders ■ Evaluation of adsorption characteristics of dispersants, etc. ■ Relative comparison of specific surface area and determination of dispersion endpoint ■ Calculation of Hansen parameters (HSP) *For more details, please download the PDF or feel free to contact us.

• Distance measuring device