Article
Nanoscience & Nanotechnology
Zhen Wang, Kailiang Zhang, Hengti Wang, Xinyu Wu, Hanyu Wang, Chenglong Weng, Yongjin Li, Shanqiu Liu, Jintao Yang
Summary: Foams made of immiscible polymer blends have attracted great interest due to the integration of desirable properties of different polymers. However, the poor interfacial strength within the blends hampers the foamability and end-use properties. This study successfully enhanced the interfacial strength and foamability of the blends by designing and synthesizing reactive interfacial compatibilizers. These findings offer new possibilities for controlling cell morphologies and designing unique cell structures for polymer foams.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Hailing He, Fuxin Liang
Summary: Janus particles (JPs) with different compositions on two lobes were synthesized and used as compatibilizers for poly(lactic acid)/poly(butylene succinate) (PBS) blends. The interfacial distributions and dispersed phase size in the blends can be controlled by adjusting the Janus balance of the JPs. Furthermore, the introduction of reactive groups into JPs enhances the interfacial interactions, leading to significantly improved ductility and toughness of the blends.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Roxanne Fournier, Maximiliano Caye Diaz, Emily D. Cranston, John M. Frostad
Summary: Cellulose nanocrystals (CNCs) are sustainable particles that stabilize emulsions by adsorbing at droplet interfaces and providing a steric barrier. Adding salt can adjust the surface charges for increased droplet coverage. However, the interfacial tension and interfacial shear rheology are not strongly correlated with emulsion stability. Furthermore, at normal CNCs concentrations, the bulk rheology is significantly affected, making the details of interfacial rheology unimportant.
Article
Polymer Science
Subeen Kim, Jongmin Q. Kim, Siyoung Q. Choi, KyuHan Kim
Summary: PolyHIPE, a polymerized high internal phase emulsion, is considered a promising platform for producing porous polymers. Photo-polymerized HIPE has been utilized in various applications, such as 3D printing of porous materials, due to its rapid curing, but a systematic study for its structural control is still lacking.
Article
Chemistry, Applied
Shasha Guo, Xia Li, Yishan Kuang, Jianming Liao, Kai Liu, Jun Li, Lihuan Mo, Shuaiming He, Wenyuan Zhu, Junlong Song, Tao Song, Orlando J. Rojas
Summary: In the preparation of oil-in-water Pickering emulsions using lignocellulose nanofibrils (LCNF), it was found that LCNF with higher residual lignin content exhibited better stability and could stabilize emulsions for over 40 days at low concentrations. The study highlights the importance of residual lignin content in LCNF as a key factor affecting the stabilization of Pickering emulsions.
CARBOHYDRATE POLYMERS
(2021)
Article
Polymer Science
Ahmad A. Adewunmi, Ahmad Mahboob, Muhammad Shahzad Kamal, Abdullah Sultan
Summary: This study evaluated the stability, viscosity, and interfacial properties of emulsions formed from diesel and water using chitosan and acacia gum blends as emulsifiers. The results showed that the stability of the emulsions was influenced by pH level and NaCl salt concentration, and the viscosity decreased with increasing shear rate. The presence of NaCl salt and pH change also affected the interfacial tension at the diesel/water interface.
Article
Nanoscience & Nanotechnology
Siqi Huan, Ya Zhu, Wenyang Xu, David Julian McClements, Long Bai, Orlando J. Rojas
Summary: By studying variables related to the adsorption of renewable nanoparticles and stabilization of multiphase systems, we prepared CNF/NCh aqueous suspensions using oppositely charged nanopolysaccharides and created sunflower oil-in-water Pickering emulsions with adjustable droplet diameters. The adsorption of CNF/NCh complexes at the oil/water interface led to highly stable emulsions with long-term stability against creaming and oiling-off, showcasing potential for foodstuff, pharmaceutical, and cosmetic formulations.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
Heleen V. M. I. Kibbelaar, Riande Dekker, Azeza K. Morcy, Willem K. P. Kegel, Krassimir P. Velikov, Daniel Bonn
Summary: The main stabilization mechanism of Pickering emulsions stabilized by ethyl cellulose nanoparticles is the adsorption of particles at the interface, rather than the formation of a network in the continuous phase. The presence of particles at the interface causes short-range interactions between the droplets, as observed from the rheological behavior of the emulsions.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Polymer Science
Xiaodong Lian, Shenglong Liao, Xiao-Qi Xu, Shoupeng Zhang, Yapei Wang
Summary: The fast interfacial polymerization (FIP) method demonstrated in this study provides a strong steric barrier at the oil-water interface to stabilize water-in-oil emulsions and microcapsule dispersions effectively. This method can produce emulsions with unique properties and is applicable for preparing high-internal-phase emulsion-like systems and stable monodispersed droplets.
Article
Energy & Fuels
Oscar J. Martinez-Villabona, Marcia C. K. de Oliveira, Lina R. Morantes, Ana M. Percebom
Summary: Interfacial materials (IMs) formed aggregates with other components of the crude oils, affecting the rheological properties and stability of emulsions. Despite the low content of asphaltenes, the Brazilian crude oils could form stable emulsions. The naphthenic acids (NAs), although considered surfactants under certain conditions, did not significantly affect the physicochemical properties of the emulsions compared to IMs.
Article
Acoustics
Chisato Kanamori, Tran Thao Nguyen, Kazuto Tsuji, Hideyuki Nakanishi, Qui Tran-Cong-Miyata, Tomohisa Norisuye
Summary: This study investigated the localization of solid microparticles at the surface of liquid droplets in Pickering emulsions using ultrasonic spectroscopy analysis and scattering function theory. The core-shell model was found to be effective for analyzing nanoparticles anchored at the surface of oil droplets, but an effective shell comprised of solid particles was no longer observed as the particle size or distance between solid particles increased. Large solid particles led to ultrasonic spectra resembling conventional surfactant-stabilized emulsions without solid stabilizers.
Article
Chemistry, Applied
Yijie Wang, Xiufeng Li, Ting Li, Yang Wang, Jie Jiang, Xuhui Zhang, Jing Huang, Bihua Xia, Ho Cheung Shum, Zhenzhong Yang, Weifu Dong
Summary: A chemical approach is used to fabricate particles by combining a water-insoluble plant protein and a hydrophilic polysaccharide, resulting in adjustable interfacial wettability and improved absorption kinetics for emulsions.
FOOD HYDROCOLLOIDS
(2023)
Article
Polymer Science
Bin Wang, Qiaolie Zheng, Mengjia Li, Sisi Wang, Shanglin Xiao, Xiping Li, Hesheng Liu
Summary: Vinylsilane grafted carbon nanotubes (VCNTs) can act as reactive compatibilizers for cocontinuous poly(lactic acid)/high-density polyethylene (PLA/HDPE) blends, with the aid of organic peroxides initiated radical reactions. The reactively compatibilized blend nanocomposites exhibit strong interfacial interactions, high crystallinity, and enhanced mechanical properties.
EXPRESS POLYMER LETTERS
(2022)
Article
Nutrition & Dietetics
Xingran Kou, Xinping Zhang, Qinfei Ke, Qingran Meng
Summary: In this study, beta-cyclodextrin (beta-CD) and ginger oil (GO) were used to prepare Pickering emulsion without an exogenous emulsifier. The obtained emulsion exhibited flocculation and had rough droplet surfaces with lamellar particles. By investigating the formation process and evolution of GO/beta-CD self-assembly, the formation process and stabilization mechanism of the beta-CD-stabilized GO Pickering emulsion were clarified preliminarily.
FRONTIERS IN NUTRITION
(2023)
Article
Chemistry, Physical
Santiago F. Velandia, Diego Ramos, Maud Lebrun, Philippe Marchal, Cecile Lemaitre, Veronique Sadtler, Thibault Roques-Carmes
Summary: The relationship between interfacial and bulk emulsion viscoelasticity was investigated in water-in-dodecane reverse Pickering emulsions stabilized with partially hydrophobic silica particles. The results showed that silica and NaCl concentrations affect the viscoelastic properties of the emulsions, with a correlation between the elastic modulus and silica concentration. Increasing the NaCl concentration strengthened the viscoelastic properties of the emulsions, and both silica and NaCl had similar effects on the interface and bulk viscoelastic properties.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Engineering, Biomedical
Akhil Patel, Vinayak Sant, Sachin Velankar, Mayuri Dutta, Vibishan Balasubramanian, Piyusha Sane, Vishi Agrawal, Jamir Wilson, Lisa C. Rohan, Shilpa Sant
JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART A
(2020)
Article
Polymer Science
Junyu Yang, Aaron Shen, Sachin S. Velankar
Summary: PPEK is an amorphous thermoplastic polymer with a high glass transition temperature, and foam preparation using a foaming agent allows for the production of foams with varying densities. The thermal conductivity and modulus of the foams decrease with density, following expected trends from existing models. The foams exhibit stability at high temperatures, suggesting potential applications in structural or insulation settings.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Medical Laboratory Technology
Ashok K. Dilly, Brendon D. Honick, Robin Frederick, Anulekha Elapavaluru, Sachin Velankar, Hima Makala, T. Kevin Hitchens, Lesley M. Foley, Jianxia Guo, Jan H. Beumer, Lora Heather Rigatti, Yong J. Lee, David L. Bartlett, Haroon A. Choudry
Summary: In patients with appendiceal mucinous carcinoma peritonei, abundant intraperitoneal accumulation of extracellular mucus causes organ dysfunction and hampers chemotherapeutic drug delivery. Combination of bromelain and N-acetylcysteine efficiently lyses extracellular mucus, reduces tumor-related symptoms, and enhances the efficacy of chemotherapy.
TRANSLATIONAL RESEARCH
(2021)
Article
Chemistry, Multidisciplinary
Derek Breid, Victoria Lai, Andrew T. Flowers, Xianheng Guan, Qihan Liu, Sachin S. Velankar
Summary: This study examines the mechanism of folding induced by solvent drops on a film, revealing a strong coupling between folding and drop spreading due to capillary effects. When the film is weakly adhered to the substrate, solvent drops spread further on the film, leading to different shapes of folds.
Article
Cell & Tissue Engineering
Shiqi Xiang, Zhong Li, Madalyn R. Fritch, La Li, Sachin Velankar, Yuwei Liu, Jihee Sohn, Natasha Baker, Hang Lin, Rocky S. Tuan
Summary: This study investigates the adipogenic differentiation of hBMSCs within soft or stiff scaffolds in 3D culture, with a focus on the molecular mechanism involving the CAV1-YAP axis. Soft biomaterials are found to better support adipogenesis of encapsulated hBMSCs, partially mediated by suppression of CAV1 expression levels and activation of YAP signaling pathway.
STEM CELL RESEARCH & THERAPY
(2021)
Article
Engineering, Mechanical
G. Rahul Ramachandran, Jonah de Cortie, Spandan Maiti, Luca Deseri, S. Sachin Velankar
Summary: The study analyzes the mechanics of shape changes in rubber-plastic bilayers during stretch-release process. The pre-stretch applied has a significant impact on the final shape, leading to various forms such as arches, rolls, and half-tubes. Yielding of the plastic layer strongly affects the mechanical behavior of the bilayers, with shape changes influenced by wrinkling.
EXTREME MECHANICS LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Emily F. Barker, Sudesna Banerjee, Tara Y. Meyer, Sachin Velankar
Summary: This study investigates the crystallization kinetics of polyoxacyclobutane (POCB) and water to form a cocrystal hydrate, revealing that decreasing temperature and water content can affect the crystallization rates.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Engineering, Mechanical
Xianheng Guan, Likhitha Reddipalli, Dylan T. Butler, Qihan Liu, Sachin S. Velankar
Summary: This study experimentally demonstrates that a viscoelastic liquid exhibits a creasing instability similar to that of elastic materials, but with strain dependence on the rate of compression. The researchers developed a model to describe the creasing behavior of viscoelastic liquids and validated it through experiments.
EXTREME MECHANICS LETTERS
(2022)
Article
Mechanics
Xianheng Guan, Anantha P. Sarma, Eashwaren Kakarla Hamesh, Junyu Yang, Nhung Nguyen, Enrique Cerda, Luka Pocivavsek, Sachin S. Velankar
Summary: In this study, we investigated the buckling behavior of a thin elastic film bonded to a viscous substrate under compression at a fixed rate. Experimental results revealed two distinct buckling modes, sinusoidal wrinkles under high compression rate or large liquid thickness, and localized tall ridges under low compression rate or small liquid thickness. We also summarized the relationships between wrinkle amplitude, interridge distance, compression rate, and liquid thickness. Additionally, we found that wrinkles formed during compression can transform into ridges under quiescent conditions.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Biophysics
Nandan N. Pitre, J. B. Moses, Edith Tzeng, Steven Abramowitch, Sachin S. Velankar
Summary: Composites of crimped fibers embedded in a soft matrix can mimic the strain-hardening behavior of collagen tissues. Finite element simulations show that large crimped fibers straighten significantly at small strain and bear increasing load at large strain. A shear lag model can capture the stress-transfer mechanics and estimate the modulus of the composite.
BIOMECHANICS AND MODELING IN MECHANOBIOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Chien Nguyen, Karthik Ramalingam, Zachary Kushnir, Fatemeh Rouhani, Sachin S. Velankar
Summary: Metallized plastic packaging films exhibit bending behavior when stretched and released, which can be reproduced in laminate composites with aluminum foil and adhesive polymer. The bending is caused by the permanent deformation of the aluminum layer during stretching, while the polymer layer deforms elastically. The composite resolves the strain mismatch by bending, with the aluminum on the convex side. The curvature increases linearly with applied strain and decreases with increasing aluminum thickness. Patterning the bilayers with defects allows for more complex shape morphing and bidirectional bending.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Mechanics
Xianheng Guan, Nhung Nguyen, Luka Pocivavsek, Enrique Cerda, Sachin S. Velankar
Summary: We conducted a computational study of a thin elastic film bonded to a thick viscous substrate undergoing compression. Short films remain flat, but longer films develop sinusoidal wrinkles and eventually transform into localized ridges. The development of ridges is a result of the competition between lower energy state offered by well-spaced ridges and faster formation of wrinkles due to shorter distances for the viscous fluid to move.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2023)
Article
Multidisciplinary Sciences
Nhung Nguyen, Eugenio Hamm Hahn, Sachin Velankar, Enrique Cerda, Luka Pocivavsek
Summary: The integration of dynamic topography with mechanical instability has been inspired by the natural surfaces' superiority in resisting soft, sticky biofoulants to promote the development of self-cleaning artificial surfaces. The current understanding of this mechanism is limited to elastic biofoulants, where surface energy, bending stiffness, and topographical wavelength play crucial roles. However, the viscoelastic nature of many biofoulants introduces complex interactions between these factors with time-dependent characteristics, such as material softening and loading rate. This study enriches the existing elastic theory of topographic de-adhesion by investigating the nonlinear, time-dependent interaction of three physical, dimensionless parameters in viscoelastic regime.
JOURNAL OF THE ROYAL SOCIETY INTERFACE
(2023)
Article
Chemistry, Physical
Xianheng Guan, Nhung Nguyen, Enrique Cerda, Luka Pocivavsek, Sachin S. Velankar
Summary: This study investigates the buckling instabilities in fluid-structure interactions and finds that they can be reduced to the analysis of a growth function that amplifies initial error noise. It is shown that wave packets with large scale modulation can emerge and transform into localized structures depending on nonlinear effects. Experimental results demonstrate that the wave packets can be amplified into ridges or diluted into wrinkles depending on the compression rates.
Article
Chemistry, Physical
Jaber Nasrollah Gavgani, Fatemeh Goharpey, Sachin Velankar
Summary: By investigating the interfacial compatibilization effect of ODA-GO in PDMS and PI homopolymer blends, it was found that the addition of ODA-GO can suppress droplet coalescence, making the immiscible polymers more stable. This has significant implications for preparing polymer blends with specific properties.
Article
Mechanics
Chen Liu, Jianzhong Lin, Zhenyu Ouyang
Summary: This study simulated the locomotion state and motion type of elliptical squirmers in a channel flow of power-law fluids. The influence of different parameters on the squirmers was explored, and it was found that coupled structures are prone to break and viscosity significantly affects the flow velocity and motion type of squirmers.
Article
Mechanics
E. E. Herrera-Valencia, M. L. Sanchez-Villavicencio, C. Soriano-Correa, O. Bautista, L. A. Ramirez-Torres, V. J. Hernandez-Abad, F. Calderas
Summary: This study investigated the electroosmotic flow of a viscoelastic fluid in a capillary system. The rheology of the fluid was characterized by a novel generalized exponential model equation, and the effect of charge density on the double-layer field and electrical forces was analyzed. Mathematical models were used to describe the rheological properties and flow performance of the fluid, and experimental data were used to make predictions. The study also examined the influence of applied forces on the structure of the fluid.
Article
Mechanics
Stefano Amadori, Giuseppe Catania
Summary: This article presents a multi-step, iterative technique for locally non-parametric identification of the standard linear solid (SLS) material model using fractional order time differential operators. Test input data consists of a set of identified material complex modulus values estimated at different frequency values obtained from input-output experimental measurements and quasi-static relaxation measurements on the same specimen. The proposed technique is based on an algebraic procedure to solve an overdetermined system of linear equations in order to obtain optimal values for the unknown parameters of the model. The procedure is non-parametric, as the order of the SLS model is initially unknown.