Journal of Colloid and Interface Science

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ISSN / EISSN : 0021-9797 / 1095-7103
Published by: Elsevier BV (10.1016)
Total articles ≅ 36,621
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William Megone, Dexu Kong, Lihui Peng,
Journal of Colloid and Interface Science, Volume 594, pp 650-657; doi:10.1016/j.jcis.2021.03.055

The structuring of liquid–liquid and liquid–air interfaces may play an important role in novel microfabrication platforms and biotechnologies, from the spontaneous formation of microfilaments from liquid droplets and the 3D printing of liquids, to the culture of stem cells on emulsions. Understanding the mechanical anisotropy of associated liquid interfaces is essential for the development of such systems. Models of AFM indentation at liquid interfaces, based on the Young-Laplace model, currently do not allow the quantification of interfacial mechanical properties of associated molecular films. This report presents such a model and compares its predictions to interfacial mechanical properties characterised via interfacial shear rheology. An extreme reversal of mechanical anisotropy of liquid–liquid interfaces is observed, upon self-assembly of protein nanosheets, by 5 orders of magnitude. Results indicate that, although interfacial rheology is more sensitive than AFM indentation to the mechanics of molecular films in the low range of interfacial mechanics, AFM indentation allows the quantification of mechanical properties of stiffer molecular films, and remains better adapted to the characterisation of small samples and enables the characterisation of local heterogeneity.
Journal of Colloid and Interface Science, Volume 594; doi:10.1016/s0021-9797(21)00514-2

Urooj Kamran,
Journal of Colloid and Interface Science, Volume 594, pp 745-758; doi:10.1016/j.jcis.2021.03.069

In this work, we developed a simple methodology for producing highly porous carbons. Herein, we combined the hydrothermal method with chemical activation to fabricate cellulose-based, melamine modified porous carbons, using acetic acid as an additive. The preparation conditions including activation temperature, activation time, and melamine ratio were varied to obtain an optimized adsorbent exhibiting efficient textural features and maximized carbon dioxide (CO2) adsorption uptake. By varying the preparation conditions, high specific surface area (SSA) (1260–3019 m2 g−1), microporosity in the range of 0.21–1.13 cm3 g−1, and a well-developed porous structure was obtained. The optimized adsorbent exhibits an excellent CO2 adsorption uptake of 297.05 mg g−1 (6.75 mmol g−1) and 174.4 mg g−1 (3.96 mmol g−1) at 273 K and 298 K at 1 bar, respectively, due to the existence of ultra-micropores (<0.68 nm, < 0.81 nm), high SSA (3019 m2 g−1), and high nitrogen content (8%). Furthermore, the role of micropores in the CO2 adsorption process suggests that micropores between 0.68 nm and 1 nm exhibit high CO2 adsorption potential. Additionally, all synthesized carbons exhibited a high isosteric heat of adsorption (45 kJ mol−1) and a greater affinity for adsorbed CO2 species than nitrogen (N2) molecules. Thus, as-fabricated porous carbon adsorbents are an effective competitor for CO2 uptake applications to mitigate global warming.
Ying Wang,
Journal of Colloid and Interface Science, Volume 594, pp 781-790; doi:10.1016/j.jcis.2021.03.077

Liquid-repellent and anti-smudge coatings have a wide range of applications on the surface of materials. In this work, a novel liquid-repellent anti-smudge hybrid coating was in situ fabricated by using tetraethyl orthosilicate (TEOS) and dimethoxydimethylsilane (DMDEOS) under acid catalysis. The resulting coatings had a high transmittance of 3–4% higher than that of blank glass. The superior smoothness and high mobility of generated poly(dimethyl siloxane) (PDMS) chains on the surface resulted in low sliding angles of 4.5° (water) and 2.8° (n-hexadecane), and a high water sliding velocity of 15.6 cm s−1 at a tilting angle of 70°. In addition, the hybrid coatings could repel both ink and dust contaminations and hinder bacteria adhesion. What’s more, the anti-smudge coatings demonstrated excellent durability and mechanical properties of 8H pencil hardness and 5A adhesion grade. Thus, a new perspective is provided for the preparation of anti-smudge coatings. The simple preparation method would bring a breakthrough in the development and application of anti-smudge materials.
Tian Wang, Kailin Li, Qiujian Le, Shijin Zhu, Xiaolong Guo, Debin Jiang,
Journal of Colloid and Interface Science, Volume 594, pp 812-823; doi:10.1016/j.jcis.2021.03.075

A novel and facile strategy is developed to tune parallel manganese dioxide (MnO2) to hollow parallel hydroxyl oxidize iron (FeOOH) replicas, which can exactly keep its original morphology. The key factors leading to the morphology-preserved transformation are the low-temperature and dropwise strategy via a serial of controlled experiments. Benefiting from the characteristics of parallel and hollow structures, the FeOOH replica delivers remarkable specific capacitance of 186.8F g−1 at 0.5 A g−1. The electrochemical performances delivered by the asymmetric supercapacitor (parallel MnO2//hollow parallel FeOOH) are much superior to those where conventional activated graphene or FeOOH nanoneedles are used as negative electrode materials. This can be attributed to the advantages of parallel nanostructure and high electrochemical matching effect of positive and negative electrode materials. The energy density is recorded up to 46.8 Wh kg−1 at the power density of 0.5 kW kg−1, while it still remains 20.7 Wh kg−1 with the maximum power density of 10 kW kg−1. Furthermore, this strategy shows great universality and can be broadened to almost all MnO2 related researches to synthesize ideal negative electrode materials with high structural and electrochemical matching effect, thus further enhances the electrochemical performances of as-prepared asymmetric supercapacitor devices.
Journal of Colloid and Interface Science, Volume 594, pp 561-574; doi:10.1016/j.jcis.2021.03.087

This study aimed to understand the structural devolution of 10% w/w rennet-induced (RG) and transglutaminase-induced acid (TG) gels in H2O and D2O under in vitro gastric conditions with and without pepsin. The real-time devolution of structure at a nano- (e.g. colloidal calcium phosphate (CCP) and micelle) and micro- (gel network) level was determined using ultra-small (USANS) and small-angle neutron scattering (SANS) with electron microscopy. Results demonstrate that gel firmness or elasticity determines disintegration behaviour during simulated mastication and consequently the particle size entering the stomach. Shear of mixing in the stomach, pH, and enzyme activity will also affect the digestion process. Our results suggest that shear of mixing primarily results in erosion at the particle surface and governs gel disintegration behaviour during the early stages of digestion. Pepsin diffusivity, and hence action, occur more readily in the latter stages of gastric digestion via access to the particle interior. This occurs via the progressively larger pores of the looser gel network and channels created within the larger, less dense casein micelles of the RG gels. Gel firmness and brittleness were greater in the D2O samples compared to H2O, facilitating gel disintegration. Despite the higher strength and elasticity of RG compared to TG, the protein network strands of the RG gels become more compact when exposed to the acidic gastric environment with comparatively larger pores observed through SEM imaging. This led to a higher degree of digestibility in RG gels compared to TG gels. This is the first study to examine casein gel structure during simulated gastric digestion using scattering and highlights the benefits of neutron scattering to monitor structural changes during digestion at multiple length scales.
, Mutian Zhang, Liang Zhang, , , Wen Li, Shiro Kubuki
Journal of Colloid and Interface Science, Volume 594, pp 635-649; doi:10.1016/j.jcis.2021.03.066

Utilization of heterogenous catalysts to trigger peroxymonosulfate (PMS) activation is considered an efficient strategy for environmental decontamination. Herein, a tightly bonded flake-like 2D/2D BiOBr/MoS2 heterojunction was successfully designed through co-precipitation process. By virtue of matched energy levels and intimate interfacial coupling, the Type-II BiOBr/MoS2 heterojunction significantly expedited charge carrier transfer and thereby promoted the catalytic performance for organic dye oxidation and Cr(VI) reduction. The specially designed BiOBr/MoS2 heterojunction is also conducive to split PMS and continuously generated highly active species (SO4−, OH and O2–) in a photo-Fenton system, achieving extraordinary catalytic capacity for various emerging organic pollutants (including phenol, bisphenol A and carbamazepine). The photoexcited electron with prolonged lifetime and exposed Mo sites with multivalence and multiphase nature can effectively activate PMS, which further promotes the oxidation efficiency of holes, as confirmed by scavenging experiments. The excellent stability and oxidative properties could justify scale up using BiOBr/MoS2 to a small pilot test, implementing the potential value in practical applications. This study would provide novel insight and cognition of PMS activation via a superior heterojunction for complex polluted wastewater treatment.
, Kirill Kholin, Irek Nizameev, Konstantin Brylev, Ilya Kashnik, Alexandra Voloshina, Anna Lyubina, Aidar Gubaidullin, Amina Daminova, Konstantin Petrov, et al.
Journal of Colloid and Interface Science, Volume 594, pp 759-769; doi:10.1016/j.jcis.2021.03.082

The surface deposition of luminescent anionic cluster complex [{Re6S8}(OH)6]4− advantages to the design and synthesis of composite luminescent silica nanoparticles (SNs) for intracellular imaging and sensing, while the encapsulation of the cluster units into SNs lacks for efficient luminescence. The deposition of the Re6 clusters resulted from their assembly at the silica surface functionalized by amino-groups provides the synthetic route for the composite SNs with bright cluster-centered luminescence invariable in pH range from 4.0 to 12.0. The pH-dependent supramolecular assembly of the cluster units with polyethyleneimine (PEI) at the silica surface is an alternative route for the synthesis of the composite SNs with high cluster-centered luminescence sensitive to pH-changes within 4.0–6.0. The sensitivity derives from the pH-driven conformational changes of PEI chains resulting in the release of the clusters from the PEI-based confinement under the acidification within pH 6.0–4.0. The potential of the composite SNs in cellular contrasting has been also revealed by the cell viability and flow cytometry measurements. It has been found that the PEI-supported embedding of the cluster units facilitates cell internalization of the composite SNs as well as results in specific intracellular distribution manifested by efficient staining of the cell nuclei in the confocal images.
Wenhui Zheng, Lijuan Xu, Yangyang Li, Yudong Huang, Bing Li, ,
Journal of Colloid and Interface Science, Volume 594, pp 584-592; doi:10.1016/j.jcis.2021.03.079

Conductive hydrogels have attracted significant attention in the area of wearable pressure sensors due to their mechanical flexibility, conductivity and self-healing capability. At subzero temperatures, water-based conductive hydrogels unavoidably lose their elasticity and conductivity which limits their practical usages at low temperatures. However, traditional conductive hydrogels are short of moisturizing and anti-freezing ability due to the limitation of pure water solvent, which greatly restricts their application in extreme environments. In this study, an anti-freezing and moisturizing conductive double network organohydrogel was prepared by incorporating thioctic acid (TA) with polyvinyl alcohol-borate (PVA-PB) in carbon nanotubes (CNTs) that were dispersed in water (H2O) and ethylene glycol (EG). The as-prepared PVA-B-TA-CNTs organohydrogel presented outstanding anti-freezing performance (−60 oC), long-term moisturizing property (30 days), excellent stability (400 cycles) and fascinating conductive sensitivity (S = 0.625 kPa−1). The occurrence of dynamic covalent disulfide bonds and noncovalent hydrogen bonds endow the conductive organohydrogels with brilliant remoldability and self-healing ability, which are significant for practical applications. These remarkable advantages make PVA-B-TA-CNTs organohydrogel to have enormous potential in the application of wearable and flexible pressure sensors, human-healthy monitor, and intelligence devices.
Naseem Abbas, Nida Rubab, , Rabbania Chaudhry, Suryyia Manzoor, , Muhammad Tariq, Jechan Lee, Shamaila Manzoor
Journal of Colloid and Interface Science, Volume 594, pp 902-913; doi:10.1016/j.jcis.2021.03.094

Here, a novel bismuth-doped nickel-cobalt ferrite (Ni0.5Co0.5Bi0.1Fe1.9O4) was synthesized using a sol-gel auto-combustion approach. The impact of bismuth substitution on the nickel-cobalt ferrite structural characteristics was investigated relative to the nickel-cobalt ferrite without bismuth substitution (Ni0.5Co0.5Fe2O4) based on diverse technical options (e.g., scanning electron microscopy-equipped with an energy dispersive X-ray spectrometer, X-ray diffraction, physisorption, and Fourier-transform infrared spectroscopy). Bismuth doping increased the surface area without affecting pore size. The X-ray diffraction pattern confirmed a nano-ferrite cubic spinel structure of the catalyst. Photodegradation of Congo red (CR) was tested using these nickel-cobalt ferrite catalysts under visible light across varying reaction parameters (e.g., pH, catalyst loading, dye concentration, and reaction time). The photo-degradation efficiency for CR in aqueous medium was the highest (98%) at pH 3 with 0.2 g catalyst loading in 100 mL under visible irradiation to reinforce the role of nanostructures as a potent photocatalyst (QY = 2.79 × 10−7 molecule photon−1). The kinetic reaction rate of Bi-doped spinel ferrite (3.5 µmol g−1 h−1) was1.25 times higher than those undoped materials. This study experimentally proved that the bismuth-doped nickel-cobalt ferrite photocatalyst is an effective option for removing industrial dyes.
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