The handling of chemicals in the laboratory presents a challenge instructing large class sizes and when students are relatively new to environment. In this work, we describe demonstrate an augmented reality colorimetric titration tool that operates out smartphone or tablet students. It allows multiple conduct exercise at same time, respond quickly actions made, correctly depict colors associated with changes pH values for indicator used. imbues unparalleled realism experiment offers strongly...

Abstract Properly controlling the rheological properties of nanoparticle inks is crucial to their printability. Here, it reported that colloidal gels containing a dynamic network graphene oxide (GO) sheets can display unusual after high‐rate shearing. When mixed with polyaniline nanofiber dispersions, GO not only facilitates gelation process but also serves as an effective energy‐transmission allow fast structural recovery gel deformed by This extraordinary phenomenon has made possible use...

In the laminar flow regime which characterizes operation of most microfluidic systems, mixing is governed primarily by molecular diffusion. An increase in interfacial surface between fluids contained system facilitates process. This can be obtained active external perturbation, requiring complex systems and operation, or passively clever design over geometrical constraints. Here, we describe an micromixer technique based on excitation vortices proximity to sharp corners junctions, as a...

Efforts to encourage laboratory automation through student access and usage of commercial equipment are hampered by prohibitive acquisition costs. Here, an automated liquid handler using manual pipettes was developed operate on a hobbyist 3D printer at cost US $325. Arising from iterative design process that ensured sufficient strength rigidity, the adapter assembly, when fabricated printing, found as it intended. Tests conducted system be sufficiently stable accurate in its positioning,...

Particle collection at low frequencies has been erstwhile demonstrated with dry particles and floating on the liquid surface. Nevertheless, ability to collect suspended in a fluid offers arguably wider usage context of microfluidic or “lab-on-a-chip” systems. This is here via an approach vibrating droplet form resonant shapes liquid-gas interface. results ranging size from 40 120 μm being collected predominantly solid-liquid interface due hydrodynamic focusing mechanism that develops through...

Computational and theoretical models of millimeter-sized bubbles placed on upright hydrophobic superhydrophobic surfaces are compared with experimental data here. Although the for a surface corroborated computational data, case showed to be able contain significantly larger volumes than predicted. This is attributed greater ability bubble contact line advance its tendency detach from because buoyancy. We surmise that static model therefore describes only an unstable equilibrium these...

Abstract The appreciation and understanding of gas generation through processes is vital in biochemical education. In this work, an augmented reality tool reported to depict the redox reaction between hydrogen peroxide sodium hypochlorite solutions, two ubiquitous oxidizing agents, create oxygen, a combustible gas. As it operates out smartphones or tablets, students are able conduct exercise collaboratively, respond manner similar actual physical experiment, oxygen volume changes relation...

Patterned copper oxide (CuO) microprotrusions have been developed by combining facile wet-chemical oxidation, photolithography and e-beam evaporation processes.

We devised a dangling cantilever optical lever setup with imaging that permits dynamical studies of superhydrophobic surfaces without the effects gravitational acceleration for better insight into mechanics. The enabled us to ascertain liquid loss and ascribe it interaction just touched surface as translated at various constant lateral speeds. At lower speeds (20-60 μm/s), interactions were characterized by strong initial pin (at up 0.6 nN force) depin followed series smaller force depins...

The contact angle is a sensitive parameter often used to define wettability. With the increasing movement toward smaller liquid volumes in many biochemical applications, key challenge lies how perform measurements retainer holding reagent for rapid evaluation and limited material loss. Here, we report simple robust method determine of small using microscopic imaging capillary meniscus that requires only radius height information. An error analysis measurement finds be highly accurate. We...

Highly wetting and nonwetting substrates have been widely used in fogwater collection systems for enhanced water harvesting. In this work, fog harvesting comprising PVC strips of different properties widths ranging from 1-5 mm were vertically aligned spaced apart at regular intervals to give the same solid area fraction 0.8. Evaluation efficiencies tested configurations revealed that 1 wide superhydrophilic was most efficient, achieving double amount harvested compared with 2.8 strips. This...

The coupling effects of rotational and translational Brownian motion in anisotropic macromolecules result differentiated diffusion constants parallel perpendicular to the particle’s long axis short term. Investigations these dynamics allow for a greater understanding how directional alignment can be harnessed applications. We investigate using carbon nanofibers here results infer that significant reduction from probable hydrodynamic interactions. constant is particularly reduced.

A two-component liquid drop is generated over a hole on superhydrophobic substrate. When 6 V electrolysis voltage was applied to the overhanging component of drop, bubbles oxygen and hydrogen at rates 0.0025 0.045 mm3/s respectively were produced. Positioning electrode beneath allowed gas travel upwards by buoyancy into overhead for aeration. The broke-up smaller sizes, which would facilitate diffusion phase, populated apex component.

Microplates with deep hydrophobic coated wells are standard tools in analytical research and clinical diagnostic screening. High throughput screening demands the dispensation of small volumes liquid; which, turn, exacts precise positioning instrumentation. This precision condition can be significantly relaxed approach described here where droplets released at entrance well fill it by capillary forces alone; provided that a critical diameter to volume dependent on liquid-solid hydophibicity...

The prevailing exposition of the particle deposition mechanism in an evaporating droplet for self-assembly does not lead one to expect any deviation behavior occur when two different types (of differing hydrophobicity) are used while keeping all other key parameters (i.e., concentration, size, and liquid volume) comparable. It is well known that if contact angle makes with surface sufficiently low a “coffee stain” pattern results, high few deposits left behind except dot at center dried out...

Transparency sheets, which are normally associated with use on overhead projectors, offer lowered costs and high amenability for optical diagnostics in microplate instrumentation. An alternative design circles scribed the surface of transparency to create boundaries hold drop place is investigated here. The 3D profile regions obtained optically showed strong likelihood affecting three-phase contact line interactions. During dispensation, angle (≈95°) was larger than advancing state (≈80°)...

The preconcentration of analytes is important in biochemical analysis as it offers the ability to detect trace species, and increase signal-to-noise ratios when using optical sensing. A strong advantage evaporation technique lies its operate without any external energy source. We have found that droplets on typical surfaces susceptible coffee staining effect leaves remnant fluorescence surface. This less pronounced with hydrophobic but shown here be still significant. use a superhydrophobic...

The adhesion forces of liquid drops on superhydrophobic surfaces are typically in the nano-Newton range which presents problems their dispensation from pipettes. Furthermore, since adheres more strongly to pipette tip, some portion will tend remain causing inaccuracy volume dispensed. We advance a novel approach here, spray an acoustic nebulizer is sent receptacle and ascertained precisely using weighing scale. surface was identified develop via galvanic displacement mechanism electroless...

The provision of hands-on wet lab training for students to perform micro-organism proliferation experiments is useful experiential skills development. However, the risk laboratory-acquired infections arising from inadvertent ingestion, inhalation or skin penetration these micro-organisms presents a safety concern. To obviate this risk, an augmented reality exercise requiring only tablet/smartphone, and petri dish with appropriate markers, was devised allow study Escherichia coli colony...

An evaporative pre-concentration method towards environmental monitoring for sustainability working in an energy conserving manner.