Article
Polymer Science
Song Hee Lee, Ji Hun An, Yeong Jae Kim, Seong Jae Lee
Summary: Electrically conductive polystyrene/carbon nanotube (CNT) microcellular foams were prepared using a HIPE polymerization technique. Modification of CNTs with polypyrrole (PPy) improved the electrical conductivity and dispersibility of the foams. The addition of PPy-CNTs significantly enhanced the rheological properties and crush strength of the foams.
Article
Chemistry, Applied
Yilin Jie, Fusheng Chen, Tingwei Zhu, Dingyang Lv
Summary: The ability of carboxymethyl chitosan (CMCS) to stabilize high internal phase emulsions (HIPEs) was investigated. CMCS formed a multi-layered network structure to stabilize the emulsions and improve their stability.
FOOD HYDROCOLLOIDS
(2022)
Article
Chemistry, Applied
Chen Huang, Fusheng Sun, Xuxi Ma, Chao Gao, Nan Yang, Katsuyoshi Nishinari
Summary: This study demonstrates the use of hydrophobically modified chitosan microgels as particle emulsifiers to stabilize high internal phase emulsions for the first time. The modified chitosan microgels have higher hydrophobicity and can effectively stabilize emulsions with high oil concentrations. The stable emulsions exhibited higher rheological compliance compared to other solid particle stabilized emulsions at high oil volume fractions.
CARBOHYDRATE POLYMERS
(2022)
Article
Materials Science, Composites
Lina Mayr, Arsen Simonyan, Josef Breu, Maxwell Joseph Wingert
Summary: The impacts of organophilic clay on open cell foams created from high-internal phase emulsion templating were investigated. It was found that organophilic hectorite could significantly improve the foam mechanics, possibly acting as a Pickering emulsifier to achieve a more consistent foam structure with improved mechanical properties.
POLYMER COMPOSITES
(2021)
Article
Chemistry, Physical
Jianhui Wu, Xin Guan, Chunhua Wang, To Ngai, Wei Lin
Summary: Waterborne polyurethane (WPU) nanoparticles were used to prepare high internal phase emulsions (HIPEs) with tailored morphology and excellent pH-responsiveness. The WPU-stabilized emulsions exhibited high stability, shear sensitivity, and excellent thixotropic recovery. They showed potential applications in oil transportation and recovery, emulsion polymerization, and heterogeneous catalysis.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Engineering, Chemical
Xueqing Li, Liuping Fan, Ruiguo Li, Yanlei Han, Jinwei Li
Summary: In this study, beta-cyclodextrin (beta-CD) based high internal phase emulsions (HIPEs) were used as building blocks for engineering high-quality 3D shapes and achieving 4D color transformation. The adsorption of beta-CD molecules at the oil-water interface and the improvement of the microstructure, rheological properties, and printing quality of the Pickering HIPEs were achieved by increasing beta-CD concentration, decreasing pH value, and adding NaCl. The 4D printing of Pickering HIPEs was achieved by introducing pH-sensitive curcumin and heat-labile NaHCO3, leading to a conformational change in curcumin and a color transformation of the samples with the variation in heating temperature, heating time, and NaHCO3 concentration.
JOURNAL OF FOOD ENGINEERING
(2023)
Article
Chemistry, Applied
Tao Ma, Ranran Cui, Shuyu Lu, Xinna Hu, Bo Xu, Yi Song, Xiaosong Hu
Summary: This study explored the utilization of highly concentrated oil-in-water emulsions to create edible 3D materials, successfully developing a high internal phase Pickering emulsion with excellent stability and printability. The research demonstrated the ability to 3D print high-resolution, high-fidelity shapes under specific conditions.
FOOD HYDROCOLLOIDS
(2022)
Article
Chemistry, Applied
Ce Cheng, Zhihua Wu, Yi Wang, Jun Chen, Yejun Zhong, Ruihong Liang, Shengfeng Peng, David Julian McClements, Wei Liu
Summary: The study investigated the ability of LF/GA complexes as emulsifiers to form and stabilize HIPEs, with properties that could be tuned by varying solution pH. The HIPEs showed good stability and environmental stability, with potential for improving the photostability of encapsulated bioactives. The research provides a useful approach for designing HIPEs with improved functional performance, which can be used in semi-solid foods for enhancing textural characteristics or nutritional profiles.
FOOD HYDROCOLLOIDS
(2021)
Article
Chemistry, Applied
Yang Ni, Jingjing Wu, Yanting Jiang, Jinwei Li, Liuping Fan, Shengquan Huang
Summary: Nanocellulose hydrogels were used for the first time to stabilize high internal phase emulsions with reversible gelation properties. Controlling the hydrogel/water ratio can lead to the preparation of stable high internal phase emulsions with strong gel strength.
FOOD HYDROCOLLOIDS
(2022)
Article
Engineering, Chemical
Yongquan Wang, Bei Fan, Li-Tao Tong, Cong Lu, Shuying Li, Jing Sun, Liya Liu, Fengzhong Wang
Summary: This study demonstrates that soy protein isolate (SPI) at pH 3 can be used to prepare edible HIPEs with corn oil as the internal phase, even at a low protein concentration. The appearance of the HIPEs remains unchanged after heating, but phase separation occurs after freeze-thaw treatment. Interestingly, there are no distinct differences in the appearance of heated HIPEs with internal phase volumes of 85% and 90% after three cycles of freeze-thawing. The HIPEs exhibit solid-like behavior and an increase in surface hydrophobicity after heating, suggesting protein interaction.
JOURNAL OF FOOD ENGINEERING
(2022)
Article
Chemistry, Applied
Bo Pang, Huan Liu, Florian Rehfeldt, Kai Zhang
Summary: This study fabricated biobased nanoparticles DAPCNPs to stabilize HIPPEs, showing high stability and potential applications under different environmental conditions. Porous scaffolds were also prepared using DAPCNPs-stabilized HIPPEs, expanding their application areas.
CARBOHYDRATE POLYMERS
(2021)
Review
Chemistry, Physical
Ana Maria Bago Rodriguez, Bernard P. Binks
Summary: This article reviews the recent progress in preparing and studying high internal phase Pickering emulsions (HIPPEs). HIPPEs, with their high interfacial area and long-term stability, are being widely used in areas such as drug delivery, catalysis, and the production of novel porous materials.
CURRENT OPINION IN COLLOID & INTERFACE SCIENCE
(2022)
Article
Engineering, Chemical
Yhan O'Neil Williams, Mara Wensveen, Meinou Corstens, Karin Schroe
Summary: This study quantitatively investigates the coalescence mechanisms of protein-stabilized high internal phase emulsions (HIPEs) using a purposely designed microfluidic chip. The observations provide new insights into the evolution of droplet interactions as a function of volume fraction and the destabilization mechanisms of protein-stabilized HIPEs.
JOURNAL OF FOOD ENGINEERING
(2024)
Article
Polymer Science
Ali Eslek, Hatice Hande Mert, Meltem Sozbir, Mohamed Alaasar, Emine Hilal Mert
Summary: High Internal Phase Emulsions (HIPEs) of dicyclopentadiene (DCPD) were prepared using surface-modified calcite (mCalcite) and a non-ionic surfactant. The emulsions were created with different ratios of internal phase, mCalcite loading, and surfactant. Macroporous polyDCPD composites were synthesized through ring-opening metathesis polymerization (ROMP) on the HIPEs. The effects of the experimental parameters on the morphological and physical properties of the composites were investigated, resulting in the derivation of five model equations with a confidence level of 95%. The interactions between surfactant amount, mCalcite loading, and internal phase ratio had a dominant role in the average cavity diameter.
Article
Agricultural Engineering
Xiaoqiang Chen, Fengjie Sun, Qianyi Tan, Ruixiang Shao, Jianchun Xie, Haifeng Wan, Gaoling Wu
Summary: In this study, polysaccharide conjugates extracted from bamboo leaf residue were used to prepare oil-in-water high internal phase emulsions (HIPEs). The polysaccharide conjugates showed good emulsifying properties and could stabilize medium-chain triglycerides. The stability and viscoelasticity of the HIPEs were enhanced with increasing polysaccharide concentration, and they exhibited good stability during storage and exposure to heat and ions.
INDUSTRIAL CROPS AND PRODUCTS
(2023)
Article
Materials Science, Paper & Wood
Tao Zhang, Yan Zhao, Michael S. Silverstein
Article
Chemistry, Multidisciplinary
Michael S. Silverstein
ISRAEL JOURNAL OF CHEMISTRY
(2020)
Article
Polymer Science
Michael S. Silverstein
Article
Polymer Science
Rotem Horowitz, Melissa Lamson, Orit Cohen, Travis B. Fu, Julia Cuthbert, Krzysztof Matyjaszewski, Michael S. Silverstein
Summary: PolyHIPEs are macroporous polymers synthesized within high internal phase emulsions, stabilized using stars and crosslinked with polyhedral silsesquioxane (POSS) to produce shape memory polymer foams.
Article
Polymer Science
Aurelie Ohana Benaddi, Orit Cohen, Krzysztof Matyjaszewski, Michael S. Silverstein
Summary: PolyHIPEs are porous polymers synthesized within high internal phase emulsions, with their properties being influenced by polymerization mechanism, initiator solubility, RAFT agent to initiator ratio, and crosslinking comonomer content. The use of surface-active RAFT agent can significantly enhance the structure of PolyHIPE. Substituting RAFT for FRP can lead to significant changes in thermal, mechanical, and uptake behaviors.
Editorial Material
Polymer Science
Michael S. Silverstein
Article
Polymer Science
Adi Horowitz, Gil Shaul, Michael S. Silverstein
Summary: This paper describes the generation of carbonaceous monoliths with hierarchically porous structures and nitrogen functionalities using a combination of hydrogel synthesis and hydrothermal carbonization. Different activation methods lead to variations in specific surface area and residual mass, while nitrogen-rich monomers result in different N/C ratios in the carbon monoliths. The hierarchically porous structures and chemical structures of these monoliths can be fine-tuned by modifying the composition and processing conditions of the high internal phase emulsions (HIPEs).
POLYMER INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Inna Berezovska, Katya Kapilov, Prachi Dhavalikar, Elizabeth Cosgriff-Hernandez, Michael S. Silverstein
Summary: PolyHIPEs are highly porous polymers synthesized within high internal phase emulsions, while Pickering HIPEs are an alternative stabilization strategy using solid nanoparticles. The successful design of an HIPE stabilization system based on a combination of nanoparticles and reactive surfactants generates the desired surface functionality and low leachable content.
MACROMOLECULAR MATERIALS AND ENGINEERING
(2021)
Article
Polymer Science
Inna Berezovska, Rajashekharayya A. Sanguramath, Michael S. Silverstein
Summary: Low-density macroporous monoliths based on unmodified beta-cyclodextrin were synthesized using emulsion templating, with high beta-CD contents (up to 63 wt%) and BPA adsorption capacities up to 117.7 mg g(-1).
JOURNAL OF POLYMER SCIENCE
(2022)
Article
Polymer Science
Sima Israel, Michal Levin, Sapir Oliel, Dahiana Mayer, Idan Lerner, Michael S. Silverstein
Summary: Hierarchically porous polymers were generated by combining emulsion-templated macroporous polymers with simultaneous Friedel-Crafts hyper-cross-linking and porogen removal. Different structures of polymer networks were synthesized to control the micro/meso-porosity and thermal stability of the materials.
Article
Polymer Science
Natalie Rosen, Hila Toledo, Michael S. Silverstein
Summary: PolyHIPEs encapsulated calcium chloride hexahydrate (CCHH) within elastomeric, emulsion-templated polymers, demonstrating the successful encapsulation of molten salt hydrates. The addition of a nucleating agent reduced supercooling and modifying the external phase enhanced HIPE stability. The resulting system showed high encapsulation efficiency, low supercooling, and negligible phase transformation.
Article
Materials Science, Multidisciplinary
Orit Cohen, Kristina Vetlitsyna-Novikova, Hila Toledo, Michael S. S. Silverstein
Summary: PolyHIPEs with high internal phase emulsion (HIPEs) templates were synthesized using PIM-like linear polymers. The addition of cross-linking comonomer resulted in monoliths with low density and highly interconnected structures. These polyHIPEs showed high adsorption capacity for cationic dyes.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Rachele Castaldo, Inna Berezovska, Michael S. Silverstein, Gennaro Gentile
Summary: PolyHIPEs templated with HCLRs exhibit advanced sorbent systems due to the synergistic combination of the adsorption capabilities of micro/mesoporous HCLRs and the absorption capacities of polyHIPEs. The amino-functionalized HCLRs significantly enhance the specific surface areas and sorption capacities of polyHIPEs for polar VOCs and CO2. The addition of HCLRs does not negatively affect the high uptake of organic solvents by polyHIPEs, and regenerability above 99% is achieved in five sorption cycles.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Materials Science, Biomaterials
Prachi Dhavalikar, Dana Jenkins, Natalie Rosen, Aparajith Kannapiran, Karim Salhadar, Orren Shachaf, Michael Silverstein, Elizabeth Cosgriff-Hernandez
Summary: This study explored the use of hydroxyapatite nanoparticles as an alternative stabilizer for emulsion-templated foams used as injectable bone grafts. It was found that a co-stabilization approach with both surfactant and nanoparticles can achieve large, interconnected pores and improved cell attachment. The concentration of hydroxyapatite nanoparticles and surfactant in the scaffolds affects the microarchitecture and cell behavior.
JOURNAL OF MATERIALS CHEMISTRY B
(2023)
Article
Polymer Science
Katya Kapilov-Buchman, Tslil Bialystocki, Danna Niezni, Luba Perry, Shulamit Levenberg, Michael S. Silverstein
Summary: PolyHIPEs are macroporous polymers templated within high internal phase emulsions (HIPEs), synthesized through urethane reactions between diisocyanates and oligomeric polyols in water-in-oil (w/o) HIPEs. The thermal transitions and mechanical properties of PolyHIPEs can be fine-tuned by adjusting the polyol macromolecular structure and molecular weight, as well as the urea content. The degradation of PolyHIPEs in 3 m NaOH demonstrated that PCL-based PUUs degrade more rapidly, and cells grown in PolyHIPEs adhered to walls, spread, and penetrated into porous structures.