Sepehri Sobhan, Andersson Johanna, Schaller Vincent, Grüttner Cordula, Stading Mats, Johansson Christer
Digital Systems, RISE Research Institutes of Sweden, Arvid Hedvalls Backe 4, SE-41133 Gothenburg, Sweden.
Bioeconomy and Health, RISE Research Institutes of Sweden, Frans Perssons väg 6, SE-40229 Gothenburg, Sweden.
Nanomaterials (Basel). 2022 Dec 23;13(1):67. doi: 10.3390/nano13010067.
We have developed a nano-rheological characterization tool to extract the frequency- and scale-dependent rheological properties of soft materials during oral processing. Taking advantage of AC susceptometry, the dynamic magnetization of magnetic nanoparticles blended in the matrix material is measured. The magnetic AC susceptibility spectra of the particles are affected by the viscosity and mechanical modulus of the matrix material and provide the rheological properties of the matrix. Commercially available iron-oxide magnetic nanoparticles with 80 and 100 nm particle sizes are used as tracers in the frequency range of 1 Hz-10 kHz. The AC susceptibility is measured using two differentially connected coils, and the effects of the sample temperature and distance with respect to the detection coils are investigated. The developed measurement setup shows the feasibility of remote nano-rheological measurements up to 2 cm from the coil system, which can be used to, e.g., monitor the texture of matrix materials during oral processing.
我们开发了一种纳米流变学表征工具，用于提取口腔加工过程中软材料的频率和尺度依赖性流变特性。利用交流磁化率测量法，测量混入基质材料中的磁性纳米颗粒的动态磁化强度。颗粒的交流磁化率谱受基质材料的粘度和机械模量影响，并提供基质的流变特性。粒径为80和100 nm的市售氧化铁磁性纳米颗粒用作1 Hz至10 kHz频率范围内的示踪剂。使用两个差分连接的线圈测量交流磁化率，并研究样品温度和相对于检测线圈的距离的影响。所开发的测量装置表明，在距线圈系统2 cm处进行远程纳米流变测量是可行的，这可用于例如监测口腔加工过程中基质材料的质地。
