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Studies on Nanoparticle Suspensions Probed by Frequency-Domain Dynamic Ultrasound Scattering Techniques 周波数ドメイン動的超音波散乱( FD-DSS )法による懸濁溶液 中のナノ粒子解析
| Content Provider | Semantic Scholar |
|---|---|
| Author | Fujisawa, Masashi Norisuye, Tomohisa Nakanishi, Hideyuki Tran-Cong-Miyata |
| Copyright Year | 2017 |
| Abstract | Recently, dynamic ultrasound scattering (DSS) technique, which is an acoustic analog of dynamic light scattering (DLS) method, opened a new route to investigate the dynamics of highly turbid suspension of nanoparticles[1]. It has several advantages compared to DLS. First, since the field time-correlation function can be directly evaluated by the fluctuations of the pressure amplitude, the conversion from the intensity to field correlation function is unnecessary. Second, the technique can be applied to a highly turbid suspension, motivating us to utilize it for studying concentrated suspensions, which is difficult to be observed by conventional optical techniques. Third, the frequency dependence of the relaxation time can be obtained by a single acquisition. Therefore, the measurement of the angular dependence is unnecessary to obtain the average particle size. Furthermore, this fact gives a new insight into understanding the dynamics over a wide range of the length scales by a single step acquisition. Thus, the DSS technique is considered to be a useful technique to probe particles in liquid in a range from several tens of nanometers to several tens of micrometers. On the other hand, since the wavelength of ultrasound is still considerably long compared to visible light, it is important to study the sensitivity and reliability of the technique. For example, the dependence of particle-concentration and of the salt-concentration have not explored yet. In the previous papers[1][2], while the nanometer-sized silica particles were investigated, the particle concentration was fixed at 5wt%. In addition, increasing the salt concentration could lead to screening of the electrostatic interactions. As the results, the particle size could be affected by the presence of the electric double layer. Therefore, in this study, silica nanoparticle suspensions in a dilute regime were studied by the DSS technique to systematically investigate the effect of salt on the hydrodynamic radius, Rh. 2. Experiments and Results |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://www.use-jp.org/proceedings/USE17/pdf/2P2-12.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
