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Elasticity and Stability of Shape Changing Structures
Publication date: Available online 27 February 2019Source: Current Opinion in Colloid & Interface ScienceAuthor(s): Douglas P. HolmesAbstractAs we enter the age of designer matter – where objects can morph and change shape on command – what tools do we need to create shape–shifting structures? At the heart of an elastic deformation is the combination of dilation and distortion, or stretching and bending. The competition between the latter can cause elastic instabilities, and over the last fifteen years these instabilities have provided a multitude of ways to prescribe and control shape change. Buckling, wrinkling, fo...
Source: Current Opinion in Colloid and Interface Science - February 27, 2019 Category: Chemistry Source Type: research

Reentrant phase behavior of nanoparticle solutions probed by small-angle scattering
Publication date: Available online 27 February 2019Source: Current Opinion in Colloid & Interface ScienceAuthor(s): Sugam Kumar, Debes Ray, Sohrab Abbas, Debasish Saha, Vinod K. Aswal, Joachim KohlbrecherAbstractThe nanoparticles in solution represent a model system, where the well-established colloidal theories such as Debye-Hückel (DH) theory and/or DLVO theory can be implemented to predict the nanoparticle phase behavior. Recently, reentrant phase transitions in a wide range of colloids (e.g. inorganic and organic nanoparticles, polymers, and biomolecules) have been observed, which are not consistent with these theorie...
Source: Current Opinion in Colloid and Interface Science - February 27, 2019 Category: Chemistry Source Type: research

Enhanced rheological properties and performance of viscoelastic surfactant fluids with embedded nanoparticles
Publication date: Available online 26 February 2019Source: Current Opinion in Colloid & Interface ScienceAuthor(s): Olga E. Philippova, Vyacheslav S. MolchanovAbstractA combination of viscoelastic surfactants with nanoparticles gives a new class of functional self-assembled materials promising for a large variety of applications. Nanoparticles improve the rheological properties of these systems due to the incorporation into the network of entangled wormlike micelles by linking to micellar end-caps, thus leading to elongation or cross-linking of the micelles. The present paper reviews recent studies of these hybrid systems....
Source: Current Opinion in Colloid and Interface Science - February 26, 2019 Category: Chemistry Source Type: research

Collapse mechanisms and extreme deformation of particle-laden interfaces
Publication date: Available online 21 February 2019Source: Current Opinion in Colloid & Interface ScienceAuthor(s): Valeria GarbinAbstractParticle-laden interfaces are at the basis of many advanced materials, such as bijels and dry water. While the final properties of these materials can generally be controlled, their response to deformation during processing and use is still poorly understood. In particular, the dynamics of particle-laden interfaces in relevant flow conditions is receiving increasing attention. These conditions are typically highly dynamic and can involve unsteady flow or large deformations. This paper gi...
Source: Current Opinion in Colloid and Interface Science - February 22, 2019 Category: Chemistry Source Type: research

Interaction of liquid foams with porous substrates
Publication date: Available online 19 February 2019Source: Current Opinion in Colloid & Interface ScienceAuthor(s): Anna Trybala, Nektaria Koursari, Phillip Johnson, Omid Arjmandi-Tash, Victor StarovAbstractWe review the most recent studies of drainage/imbibition of foams placed on porous substrates: the latest theoretical models, simulation studies and experimental observations. Foam products are ideal for imbibition and penetration into porous media and they have become of substantial both industrial and scientific interests. Foams are suitable products in cosmetics and pharmaceutical industry and have recently been used...
Source: Current Opinion in Colloid and Interface Science - February 19, 2019 Category: Chemistry Source Type: research

Microrheology with Optical Tweezers: Peaks & Troughs
Publication date: Available online 16 February 2019Source: Current Opinion in Colloid & Interface ScienceAuthor(s): Manlio TassieriAbstractSince their first appearance in the ’70s, Optical Tweezers have been successfully exploited for a variety of applications throughout the natural sciences, revolutionising the field of micro-sensing. However, when adopted for microrheology studies, there exist some peaks & troughs on their modus operandi and data analysis that I wish to address and possibly iron out, providing a guide to future rheological studies from a microscopic perspective.Graphical abstract (Source: Current Opini...
Source: Current Opinion in Colloid and Interface Science - February 16, 2019 Category: Chemistry Source Type: research

Responsive Hydrogel Colloids: Structure, Interactions, Phase Behaviour, and Equilibrium and Non-Equilibrium Transitions of Microgel Dispersions
Publication date: Available online 14 February 2019Source: Current Opinion in Colloid & Interface ScienceAuthor(s): J. Brijitta, P. SchurtenbergerAbstractSoft and responsive colloids based on polymer hydrogels have moved into the focus of the colloid community. This review gives a brief overview of the recent literature on the structure and phase behaviour of neutral and ionic poly(N-isopropylacrylamide) microgel dispersions from dilute to over-packed conditions, focusing in particular on the ability of these particles to adapt their size and shape in response to external stimuli. The review is hierarchical; it first cover...
Source: Current Opinion in Colloid and Interface Science - February 15, 2019 Category: Chemistry Source Type: research

Strategic Synergy: Advances in the Shape Control of Bimetallic Nanoparticles with Dilute Alloyed Surfaces
Publication date: Available online 15 February 2019Source: Current Opinion in Colloid & Interface ScienceAuthor(s): Haeyoon Jung, Melissa E. King, Michelle L. PersonickAbstractBimetallic nanoparticles with dilute alloyed surfaces are promising materials for many applications, especially catalysis. However, the preparation of nanoparticles composed of catalytically advantageous metal pairs is complicated by challenges, such as lattice mismatch and dissimilar reduction potentials. This review presents recent advances in nanoparticle shape and composition control, and these syntheses can be classified as “two-step” or “...
Source: Current Opinion in Colloid and Interface Science - February 15, 2019 Category: Chemistry Source Type: research

Review of nonlinear oscillatory shear flow notations and Presentations: Polymeric liquids
Publication date: Available online 12 February 2019Source: Current Opinion in Colloid & Interface ScienceAuthor(s): C. Saengow, A.J. GiacominAbstractWe review notations for, along with ways of presenting, the shear stress responses to large-amplitude oscillatory shear flow (LAOS). We find that the Fourier loss and storage viscosities to be the simplest primal notations for interpreting LAOS. The relative intensities provide the best evidence for oscillatory shear entering the large-amplitude regime. Deviation from linear viscoelastic can be observed through the distortions of Lissajous loops. We explore these loops in thei...
Source: Current Opinion in Colloid and Interface Science - February 12, 2019 Category: Chemistry Source Type: research

Supramolecular Structures in Lipid Digestion and Implications for Functional Food Delivery
Publication date: Available online 8 February 2019Source: Current Opinion in Colloid & Interface ScienceAuthor(s): Stefan SalentinigAbstractThe daily diet is important for our survival, health, and wellbeing. Functional food materials, which tailor the digestion process, can help maintaining and even improving human health and lifestyle. Knowledge on how food products, particularly food emulsions such as milk, interact with the digestive system, where they transform into supramolecular structures, can have a direct impact on the rational design of such advanced materials for functional food delivery applications. These mat...
Source: Current Opinion in Colloid and Interface Science - February 9, 2019 Category: Chemistry Source Type: research

Protein interactions with negatively charged inorganic surfaces: simulation and experiment
Publication date: Available online 8 February 2019Source: Current Opinion in Colloid & Interface ScienceAuthor(s): Karina Kubiak-Ossowska, Barbara Jachimska, Mohammed Al Qaraghuli, Paul A. MulheranAbstractProtein adsorption on charged inorganic solid materials has recently attracted enormous interest due to its various possible applications including drug delivery and biomaterial design. The need to combine experimental and computational approaches to get a detailed picture of the adsorbed protein properties is increasingly recognised, and emphasised in this review. We discuss the methods frequently used to study protein a...
Source: Current Opinion in Colloid and Interface Science - February 9, 2019 Category: Chemistry Source Type: research

Time-dependent yield stress materials
Publication date: Available online 7 February 2019Source: Current Opinion in Colloid & Interface ScienceAuthor(s): Paulo R. de Souza Mendes, Roney L. ThompsonAbstractTime-dependent yield stress materials abound in nature and in industrial processes. Examples include clays, light metal alloys, paints and inks, adhesives, gelled waxy crude oils, drilling muds, fresh cement pastes, food products, biological fluids, ferrofluids, some lubricants, gypsum paste, and many other slurries, emulsions, suspensions and foams. In this paper we describe the main features of time-dependent yield stress materials, present recent developmen...
Source: Current Opinion in Colloid and Interface Science - February 8, 2019 Category: Chemistry Source Type: research

Colloidal systems with a short-range attraction and long-range repulsion: phase diagrams, structures, and dynamics
Publication date: Available online 8 February 2019Source: Current Opinion in Colloid & Interface ScienceAuthor(s): Yun Liu, Yuyin XiAbstractColloidal systems with both a short-range attraction and long-range repulsion (SALR) have rich phases compared with the traditional hard sphere systems or sticky hard sphere systems. The competition between the short-range attraction and long-range repulsion results in the frustrated phase separation, which leads to the formation of intermediate range order (IRO) structures and introduces new phases to both equilibrium and non-equilibrium phase diagrams, such as clustered fluid, cluste...
Source: Current Opinion in Colloid and Interface Science - February 8, 2019 Category: Chemistry Source Type: research

Recent Developments in Pickering Emulsions for Biomedical Applications
Publication date: Available online 7 February 2019Source: Current Opinion in Colloid & Interface ScienceAuthor(s): Clarissa L.G. Harman, Mezhabin A. Patel, Stefan Guldin, Gemma-Louise DaviesAbstractPickering emulsions, stabilised by organic or inorganic particles, offer long-term dispersibility of liquid droplets and resistance to coalescence. The versatility of stabilising particles and their ability to encapsulate and release cargo with high internal payload capacity makes them attractive in a wide variety of applications, ranging from catalysis to the cosmetic and food industry. While these properties make them an equal...
Source: Current Opinion in Colloid and Interface Science - February 7, 2019 Category: Chemistry Source Type: research

Understanding Plasmonic Catalysis with Controlled Nanomaterials based on Catalytic and Plasmonic Metals
Publication date: Available online 5 February 2019Source: Current Opinion in Colloid & Interface ScienceAuthor(s): Thaylan P. Araújo, Jhon Quiroz, EduardoC.M. Barbosa, Pedro H.C. CamargoAbstractRecently, it has been established that the localized surface plasmon resonance (LSPR) excitation in plasmonic nanoparticles can be put towards the acceleration and control of molecular transformations. This field, named plasmonic catalysis, has emerged as a new frontier in nanocatalysis. For metals such as silver (Ag), gold (Au), and copper (Cu), the LSPR excitation can take place in the visible and near-infrared ranges, opening po...
Source: Current Opinion in Colloid and Interface Science - February 6, 2019 Category: Chemistry Source Type: research