Solid surface vs. liquid surface: nanoarchitectonics, molecular machines, and DNA origami

2017 ◽  
Vol 19 (35) ◽  
pp. 23658-23676 ◽  
Author(s):  
Katsuhiko Ariga ◽  
Taizo Mori ◽  
Waka Nakanishi ◽  
Jonathan P. Hill
Keyword(s):  
Solid Surface ◽  
Liquid Surface ◽  
Science And Technology ◽  
Molecular Machines ◽  
Dna Origami ◽  
Future Developments ◽  
Liquid Surfaces

Comparisons of science and technology between these solid and liquid surfaces would be a good navigation for current-to-future developments.

scholarly journals DNA Origami Nanomachines

Molecules ◽  
2018 ◽  
Vol 23 (7) ◽  
pp. 1766 ◽  
Author(s):  
Masayuki Endo ◽  
Hiroshi Sugiyama
Keyword(s):  
Dna Sequences ◽  
Molecular Motors ◽  
Molecular Machines ◽  
Dna Origami ◽  
Dna Nanostructures ◽  
Molecular Systems ◽  
Nanoscale Structures ◽  
Research Fields ◽  
Dna Strands ◽  
External Stimuli

DNA can assemble various molecules and nanomaterials in a programmed fashion and is a powerful tool in the nanotechnology and biology research fields. DNA also allows the construction of desired nanoscale structures via the design of DNA sequences. Structural nanotechnology, especially DNA origami, is widely used to design and create functionalized nanostructures and devices. In addition, DNA molecular machines have been created and are operated by specific DNA strands and external stimuli to perform linear, rotational, and reciprocating movements. Furthermore, complicated molecular systems have been created on DNA nanostructures by arranging multiple molecules and molecular machines precisely to mimic biological systems. Currently, DNA nanomachines, such as molecular motors, are operated on DNA nanostructures. Dynamic DNA nanostructures that have a mechanically controllable system have also been developed. In this review, we describe recent research on new DNA nanomachines and nanosystems that were built on designed DNA nanostructures.

Macroscopic Wetting Behavior and a Method for Measuring Contact Angles

1990 ◽  
Vol 112 (3) ◽  
pp. 289-295 ◽  
Author(s):  
K. Katoh ◽  
H. Fujita ◽  
H. Sasaki
Keyword(s):  
Contact Angle ◽  
Solid Surface ◽  
Liquid Surface ◽  
Contact Angles ◽  
Critical Height ◽  
Solid Cone ◽  
Wetting Behavior ◽  
Conventional View ◽  
The Subject ◽  
Thermodynamic Instability

Macroscopic wetting behavior is investigated theoretically from a thermodynamic viewpoint. The axisymmetric liquid meniscus formed under a conical solid surface is chosen as the subject of the theoretical analysis. Using the meniscus configuration obtained by the Laplace equation, the total free energy of the system is calculated. In the case of the half vertical angle of the cone φ = 90 deg (horizontal plate), the system shows thermodynamic instability when the meniscus attaches to the solid surface at the contact angle. This result, unlike the conventional view, agrees well with the practical wetting behavior observed in this study. On the other hand, when 0 deg < φ < 90 deg, the system shows thermodynamic stability at the contact angle. However, when the solid cone is held at a position higher than the critical height from a stationary liquid surface, the system becomes unstable. It is possible to measure the contact angle easily using this unstable phenomenon.

scholarly journals Light-induced actuating nanotransducers

2016 ◽  
Vol 113 (20) ◽  
pp. 5503-5507 ◽  
Author(s):  
Tao Ding ◽  
Ventsislav K. Valev ◽  
Andrew R. Salmon ◽  
Chris J. Forman ◽  
Stoyan K. Smoukov ◽  
...  
Keyword(s):  
Rational Design ◽  
Au Nanoparticles ◽  
Van Der Waals ◽  
Molecular Machines ◽  
Dna Origami ◽  
Incident Laser ◽  
Responsive Polymers ◽  
Temperature Responsive ◽  
Base Polymer ◽  
Polymer State

Nanoactuators and nanomachines have long been sought after, but key bottlenecks remain. Forces at submicrometer scales are weak and slow, control is hard to achieve, and power cannot be reliably supplied. Despite the increasing complexity of nanodevices such as DNA origami and molecular machines, rapid mechanical operations are not yet possible. Here, we bind temperature-responsive polymers to charged Au nanoparticles, storing elastic energy that can be rapidly released under light control for repeatable isotropic nanoactuation. Optically heating above a critical temperature Tc = 32 °C using plasmonic absorption of an incident laser causes the coatings to expel water and collapse within a microsecond to the nanoscale, millions of times faster than the base polymer. This triggers a controllable number of nanoparticles to tightly bind in clusters. Surprisingly, by cooling below Tc their strong van der Waals attraction is overcome as the polymer expands, exerting nanoscale forces of several nN. This large force depends on van der Waals attractions between Au cores being very large in the collapsed polymer state, setting up a tightly compressed polymer spring which can be triggered into the inflated state. Our insights lead toward rational design of diverse colloidal nanomachines.

scholarly journals Liquid Surfaces

IDEA JOURNAL ◽  
2017 ◽  
pp. 62-73
Author(s):  
Alexandra Brown ◽  
Kirsty Volz
Keyword(s):  
Science Fiction ◽  
Liquid Surface ◽  
Horror Films ◽  
Apartment Building ◽  
Young Girls ◽  
Film And Television ◽  
Minor Architecture ◽  
Psychic State ◽  
Liquid Surfaces

  Exploring the interactions between liquid surfaces and their relationship to the figure of the fille fatale in dark genres of film and television, this paper suggests that the liquid surface not only disrupts our understanding of architecture as a static structural envelope, but also acts to destabilise the image of the innocent girl in science fiction and horror films and television. The discussion focuses on three relatively recent depictions of young girls who confront (or are forced to confront) the liquid surface: Mitsuko’s submersion in the water vessels of an apartment building in Dark Water (2002), Ofelia and the muddy interior of the tree in Pan’s Labyrinth (2006), and the watery floor of Eleven’s psychic state in Stranger Things (2016). Working with Jill Stoner’s understanding of minor architectures and their ability to deterritorialise both physical structures and structures of power, the paper asks to what extent the liquid surface encounters of Ofelia, Mitsuko and Eleven exist as reflections of each character’s experiences, or as currents of agency through which the fille fatale reshapes her world. In doing so the research considers the ways in which fictional liquid surfaces operate as a visual minor architecture that elicits a questioning of social and physical norms.

Spontaneous Liquid-Liquid Slug Flow in Microchannels

2006 ◽  
Author(s):  
Joseph E. Hernandez ◽  
Jeffrey S. Allen
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Slug Flow ◽  
Liquid Surface ◽  
The Self ◽  
Viscous Resistance ◽  
Liquid Slug ◽  
Interfacial Tensions ◽  
Liquid Surfaces

Spontaneous liquid-liquid slug (bislug) flow in microchannels has been observed for both circular and square cross sections. Flow is induced via an imbalance in interfacial tensions and curvatures between the two gas-liquid surfaces and the liquid-liquid surface. Bislug flow in square cross-section microchannels is generally much quicker than bislug flow in circular capillaries for a variety of reasons; including the self-wetting nature of the microchannel and the decrease in viscous resistance in the corners.

Oversight of emerging science and technology: Lessons from history to guide future developments

2019 ◽  
Author(s):  
Salil Gunashekar ◽  
Sarah Parks ◽  
Joe Francombe ◽  
Camilla d'Angelo ◽  
Gemma-Claire Ali ◽  
...  
Keyword(s):  
Science And Technology ◽  
Future Developments

scholarly journals Characterizing surface wetting and interfacial properties using enhanced sampling (SWIPES)

Soft Matter ◽  
2019 ◽  
Vol 15 (5) ◽  
pp. 860-869 ◽  
Author(s):  
Hao Jiang ◽  
Suruchi Fialoke ◽  
Zachariah Vicars ◽  
Amish J. Patel
Keyword(s):  
Surface Tension ◽  
Contact Angle ◽  
Solid Surface ◽  
Efficient Method ◽  
Liquid Surface ◽  
Liquid Droplet ◽  
Interfacial Properties ◽  
Enhanced Sampling ◽  
Surface Wetting ◽  
Liquid Surface Tension

We introduce an accurate and efficient method for characterizing surface wetting and interfacial properties, such as the contact angle made by a liquid droplet on a solid surface, and the vapor–liquid surface tension of a fluid.

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