Article
Chemistry, Multidisciplinary
W-J Li, H. Jiang, X-Q Wang, D-Y Zhang, Y. Zhu, Y. Ke, W. Wang, H-B Yang
Summary: This study successfully constructed a series of rotaxane-branched dendrimers with interesting dynamic features and enhanced antenna effects, which can be used not only for light harvesting but also for the construction of smart supramolecular materials for practical applications.
MATERIALS TODAY CHEMISTRY
(2022)
Article
Polymer Science
Taichi Ikeda
Summary: Poly(ionic liquid)s with different side-chain branching structures were synthesized and their effects on physical properties, such as ionic conductivity, were studied. It was found that branching of side chains can enhance the ionic conductivity of the polymers, breaking the conventional limit of poly(ionic liquid)s.
Article
Chemistry, Applied
D. A. Mendez, A. Martinez-Abad, M. Martinez-Sanz, A. Lopez-Rubio, M. J. Fabra
Summary: In this study, pectin extracts from watermelon rind were enzymatically treated and their potential for preparing hydrogels was evaluated. The results showed that the structural properties of pectin play a significant role in the formation of hydrogels.
FOOD HYDROCOLLOIDS
(2023)
Article
Optics
Xiaobing Feng, Guiqiong Huang, Jian Qiu, Li Peng, Kaiqing Luo, Dongmei Liu, Peng Han
Summary: Dynamic light scattering, a technique for sub-micrometer particle sizing based on Brownian motion theory, is not suitable for particles undergoing both random and directional movement, especially in uncertain directions. This paper derives the intensity autocorrelation function of scattered light for particle systems with random and directional movement, and introduces additional sinc functions to account for the directional movement. Experimental results confirm the validity of the derivation, and the application of this technique can be extended to investigate complex fluid systems with particles undergoing directional movement in known or unknown directions.
OPTICS COMMUNICATIONS
(2023)
Article
Physics, Multidisciplinary
Anatoly Patsyk, Yonatan Sharabi, Uri Sivan, Mordechai Segev
Summary: This article reports the first experimental observation of branched flow of spatially incoherent light. Branching effects exist for both coherent and incoherent light, but sidelobes accompanying the branches disappear when the light becomes incoherent.
Article
Biochemistry & Molecular Biology
Ish Kumar, Amin Sagar, Kanika Dhiman, Christopher R. Bethel, Andrea M. Hujer, Justin Carifi, Ashish, Robert Bonomo
Summary: Designing new beta-lactamase inhibitors (BLIs) is crucial to combat BL-mediated resistance. Small angle x-ray scattering (SAXS) in combination with molecular modeling can determine dynamic structures of macromolecules in solution and is useful in studying conformational changes in enzyme-inhibitor complexes. Our findings support the importance of exploring conformational changes using SAXS analysis in the design of future BLIs.
JOURNAL OF BIOMOLECULAR STRUCTURE & DYNAMICS
(2023)
Article
Chemistry, Multidisciplinary
Mehran Amiri, Nicolas P. Martin, Ching-Lei Feng, Jacob Kreager Lovio, May Nyman
Summary: Polyoxometalates are molecular metal oxides that can be isolated without capping ligands, showing high negative charge. Carbonate can reassemble with highly reactive decaniobate to form new structures with strong interactions.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Polymer Science
Christian Aponte-Rivera, Michael Rubinstein
Summary: This study presents a scaling theory to predict the dynamics of symmetric and asymmetric unentangled liquid coacervates formed by solutions of oppositely charged polyelectrolytes. Symmetric coacervates consist of polycations and polyanions with equal charge densities and a single correlation length, while asymmetric coacervates have unequal charge densities and a double semidilute structure with two correlation lengths. The dynamic coupling in asymmetric coacervates increases the friction and contribution to zero-shear viscosity of high-charge-density polyelectrolytes, with a non-monotonic salt concentration dependence of the zero-shear viscosity predicted.
Article
Engineering, Chemical
Yingxue Wu, Xianhong Zhang, Dong Chen, Yuhong Ma, Qin Wang, Jiadong Wang, Wantai Yang
Summary: Efficient and cost-effective strategy for the production of branched polyacrylamides (PAMs) through UV polymerization of acrylamide (AM) initiated with a novel water-soluble macro-photoinitiator has been developed. The branching degree and main-chain length of the branched PAMs can be controlled by adjusting the monomer feed ratio of AM/M2959. The resulting branched PAMs exhibit excellent water solubility, shear resistance, and well-defined branched structure, making them versatile for various applications.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Chemistry, Multidisciplinary
Alex McGlasson, Laura C. Bradley
Summary: DLS method allows characterization of the 3D active motion of JM and quantification of time-dependent behavior for a broader range of JM sizes. The translational and rotational diffusion of JM is decoupled by studying the functions of fuel concentration, JM concentration, and time after fuel addition.
Article
Engineering, Electrical & Electronic
Guiqiong Huang, Bingquan Xu, Jian Qiu, Li Peng, Kaiqing Luo, Dongmei Liu, Peng Han
Summary: Dynamic light scattering is a standard technique for nanoparticle sizing in colloid systems, but measuring particle size accurately in flowing dispersions, such as in online measurement, is challenging. The variation of the wave vector of scattered light due to directional movement of particles introduces an additional term to the traditional intensity autocorrelation function, affecting final particle size determination, particularly for particles with large directional velocities. Experimental results confirmed the findings and suggest a wider range of application for dynamic light scattering, especially in online measurements in flowing dispersions.
IEEE PHOTONICS JOURNAL
(2021)
Article
Optics
Mei Chen, Yanghong Wang, Wei Li, Min Xia, Ziqiang Meng, Li Xia
Summary: In this study, a novel integrated dual-angle DLS prototype was designed to measure particle size by combining microfluidic chip and fiber optic probes. The instrument achieved high accuracy at high concentrations and small sample consumption using a linear regression model for calibration. Additionally, the implementation of dual-angle online measurement in the fiber DLS system with microfluidic chip showed improved repeatability compared to single-angle DLS measurement.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Biotechnology & Applied Microbiology
Xu He, Chao Wang, Yichuan Wang, Junxiao Yu, Yanfeng Zhao, Jianqing Li, Mubashir Hussain, Bin Liu
Summary: In this study, a prototype device was developed for rapid detection of particle size using multi-angle dynamic light scattering and a machine learning approach. The results showed that the device accurately classified different-sized particles and detected microbial particles within the range of 1-4 µm.
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2022)
Article
Polymer Science
Jae Hyun Sim, Yejin Kwon, Sangwon Eom, Myoungsoon Hwang, Soyoung Park, Hyorin Choi, Hoeil Chung, Daewon Sohn, Youngjong Kang
Summary: This study observes the synergistic solubility enhancement of poly(methyl methacrylate) (PMMA) in ethanol/water mixtures in the presence of benzoic acid (BA). SAXS and 2D correlation Raman experiments reveal strong interaction between PMMA chains and BA molecules through hydrogen bonding and dispersion interactions, leading to spontaneous chain extension. Crystallized stereo-irregular alpha-PMMAs are formed by spray-induced rapid solidification process in PMMA/BA/ethanol/water solutions, resulting in films composed of microfibrils with clear melting transitions and in-plane diffraction patterns.
Article
Polymer Science
Roman Solovov, Anfisa Kazberova, Boris Ershov
Summary: The molar mass of nitrocellulose was successfully determined using the dynamic light scattering method. The methodology for fractionating nitrocellulose in acetonic solutions and obtaining six polymer fractions with monomodal distribution is described. It was found that the unfractionated colloxylin had a polymodal molar mass distribution, with mass average molecular mass values of 87.3 +/- 14.1, 28.3 +/- 7.3, and 0.54 +/- 0.17 kDa when investigated by the dynamic light scattering method. The viscometric method provided an integral viscosity average molar mass of 56.7 +/- 5.8 kDa.
