202 citations · 1.3k across the 46 of their papers we have counts for
46 papers
Review of microscale dynamics of dilution-induced asphaltene precipitation under controlled mixing conditions
Jia Meng, Somasekhara Goud Sontti, Xuehua Zhang
As the most complex and heaviest component in bitumen, asphaltene precipitation induced by solvent dilution is important in oil sands extraction to remove solids and water from bit…
Evaporation of binary liquids from a capillary tube
Lijun Thayyil Raju, Christian Diddens, Javier Rodríguez-Rodríguez +4
Evaporation of multi-component liquid mixtures in confined geometries, such as capillaries, is crucial in applications such as microfluidics, two-phase cooling devices, and inkjet…
Dissolution Dynamics of a Binary Switchable Hydrophilicty Solvent -- Polymer Drop into an Acidic Aqueous Phase
Romain Billet, Binglin Zeng, James Lockhart +3
Switchable hydrophilicity solvents (SHSs) are solvents defined by their ability to switch from their hydrophobic form to a hydrophilic form when put in contact with an acidic trigg…
Nanoextraction based on surface nanodroplets for chemical preconcentration and determination
Hongyan Wu, Chiranjeevi Kanike, Arnab Atta +1
Liquid-liquid extraction based on surface nanodroplets, namely nanoextraction, can continuously extract and enrich target analytes from the flow of a sample solution. This sample p…
Evaporation of a sessile colloidal water-glycerol droplet: Marangoni ring formation
Lijun Thayyil Raju, Christian Diddens, Yaxing Li +4
The transport and aggregation of particles in suspensions is an important process in many physicochemical and industrial processes. In this work, we study the transport of particle…
Size distribution of primary submicron particles and larger aggregates in solvent induced asphaltene precipitation
Jia Meng, Somasekhara Goud Sontti, Mohsen Sadeghi +4
Asphaltene precipitation is a crucial phase separation phenomenon in the oil industry, especially in paraffinic froth treatment to extract bitumen from oil sands ores. This work re…
Growth Rates of Hydrogen Microbubbles in Reacting Femtoliter Droplets
Zhengxin Li, Hongbo Zeng, Xuehua Zhang
Chemical reactions in small droplets are extensively explored to accelerate the discovery of new materials, increase efficiency and specificity in catalytic biphasic conversion and…
Surface Properties of Colloidal Particles Affect Colloidal Self-Assembly in Evaporating Self-Lubricating Ternary Droplets
Olga Koshkina, Lijun Thayyil Raju, Anke Kaltbeitzel +4
In this work, we unravel the role of surface properties of colloidal particles on the formation of supraparticles (clusters of colloidal particles) in a colloidal Ouzo droplet. Sel…
Oscillatory droplet dissolution from competing Marangoni and gravitational flows
Ricardo Arturo Lopez de la Cruz, Christian Diddens, Xuehua Zhang +1
The dissolution or growth of a droplet in a host liquid is an important part for processes like chemical extraction, chromatography or emulsification. In this work we look at the d…
Self-Propelled Detachment upon Coalescence of Surface Bubbles
Pengyu Lv, Pablo Peñas, Hai Le The +4
The removal of microbubbles from substrates is crucial for the efficiency of many catalytic and electrochemical gas evolution reactions in liquids. The current work investigates th…
Interfacial Partitioning Enhances Microextractionby Multicomponent Nanodroplets
Zixiang Wei, Jae Bem You, Hongbo Zeng +1
The sensitive and reliable in-droplet chemical analysis benefits from the enhanced partition of an analyte into the droplets. This work, we will show that chemical reactions in sur…
Size Effect on Reaction Rate of Surface Nanodroplets
Zhengxin Li, Akihito Kiyama, Xuehua Zhang +1
Compartmentalizing reagents within small droplets is promising for highly efficient conversion and simplified procedures in many biphasic chemical reactions. In this work, surface…
Marangoni instability triggered by selective evaporation of a binary liquid inside a Hele-Shaw cell
Ricardo Arturo Lopez de la Cruz, Christian Diddens, Xuehua Zhang +1
Interfacial stability is important for many processes involving heat and mass transfer across two immiscible phases. When this transfer takes place in the form of evaporation of a…
How fast do microdroplets generated during liquid-liquid phase separation move in a confined 2D space?
Gilmar F. Arends, John M. Shaw, Xuehua Zhang
How liquid transport occurs in confined spaces is relevant to many industrial and lab-scale processes, ranging from enhanced oil recovery to drug delivery systems. In this work, we…
Surface nanodroplet-based nanoextraction from sub-milliliter volumes of dense suspensions
Jae Bem You, Detlef Lohse, Xuehua Zhang
Cleaner analytic technique for quantifying compounds in dense suspension is needed for wastewater and environment analysis, chemical or bio-conversion process monitoring, biomedica…
Effects of chemical and geometric micro-structures on crystallization of surface droplets during solvent exchange
Howon Choi, Zixiang Wei, Jae Bem You +2
In this work, we investigate crystallization from droplets formed on micro-patterned surfaces. By solvent exchange in a micro-chamber, a ternary solution consisting of a model comp…
Enhanced displacement of phase separating liquid mixtures in 2D confined spaces
Gilmar F. Arends, Jae Bem You, John M. Shaw +1
Displacing liquid in a confined space is important for technological processes, ranging from porous membrane separation to CO sequestration. The liquid to be displaced usuall…
Microfluidic device coupled with total internal reflection microscopy for in situ observation of precipitation
Jia Meng, Jae Bem You, Gilmar F. Arends +3
In situ observation of precipitation or phase separation induced by solvent addition is important in studying its dynamics. Combined with optical and fluorescence microscopy, micro…
Oiling-out Crystallization of Beta-Alanine onSolid Surfaces Controlled by Solvent Exchange
Xuehua Zhang, Zixiang Wei, Howon Choi +2
Droplet formation in oiling-out crystallization has important implication for separation and purification of pharmaceutical active ingredients by using an antisolvent. In this work…
Integrated nanoextraction and colorimetric reactions in surface nanodroplets for combinative analysis
Zixiang Wei, Miaosi Li, Hongbo Zeng +1
A combinative approach for chemical analysis makes it possible to distinguish a mixture of a large number of compounds from other mixtures in a single step. This work demonstrates…
Accelerated Formation of H2 Nanobubbles from a Surface Nanodroplet Reaction
Brendan P. Dyett, Xuehua Zhang
The compartmentalization of chemical reactions within droplets has advantages in low costs, reduced consumption of reagents and increased throughput. Reactions in small droplets ha…
Speeding up biphasic reactions with surface nanodroplets
Zhengxin Li, Akihito Kiyama, Hongbo Zeng +2
Biphasic chemical reactions compartmentalized in small droplets offer advantages, such as streamlined procedures for chemical analysis, enhanced chemical reaction efficiency and hi…
Viscosity-Mediated Growth and Coalescence of Surface Nanodroplets
Jia Meng, Jae Bem You, Xuehua Zhang
Solvent exchange is a simple method to produce surface nanodroplets on a substrate for a wide range of applications by displacing a solution of good solvent, poor solvent and oil (…
Physicochemical Hydrodynamics of Droplets out of Equilibrium: A Perspective Review
Detlef Lohse, Xuehua Zhang
Droplets abound in nature and technology. In general, they are multicomponent, and, when out of equilibrium, with gradients in concentration, implying flow and mass transport. More…