Engineering anisotropic biphasic Janus‐type polymer nanofiber scaffold networks via centrifugal jet spinning

Khang, Alex; Ravishankar, Prashanth; Krishnaswamy, Aditya; Anderson, P.; Cone, Stephanie G.; Liu, Zizhao; Qian, Xianghong; Balachandran, Kartik

doi:10.1002/jbm.b.33791

Cited by 29 publications

(39 citation statements)

References 24 publications

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“…Janus membranes can be obtained by either asymmetric fabrication or asymmetric modification. Asymmetric fabrication includes integrating double layers through sequential electrospinning, filtration, or directly compositing ready‐made layers into a membrane . Only a limited number of materials are readily available by this method, such as nanofibers, nanowires, and carbon nanotubes .…”

Section: Introducing Asymmetry Into Membranesmentioning

confidence: 99%

Janus Membranes: Creating Asymmetry for Energy Efficiency

et al. 2018

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Membranes are recognized as a key component in many environment and energy-related applications, but conventional membranes are challenged to satisfy the growing demand for ever more energy-efficient processes. Janus membranes, a novel class with asymmetric properties on each side, have recently emerged and represent enticing opportunities to address this challenge. With an inner driving force arising from their asymmetric configuration, Janus membranes are appealing for enhancing energy efficiency in a variety of membrane processes by promoting the desired transport. Here, the fundamental principles to prepare Janus membranes with asymmetric surface wettability and charges are summarized, and how they work in conventional and unconventional membrane processes is demonstrated.

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Section: Introducing Asymmetry Into Membranesmentioning

confidence: 99%

Janus Membranes: Creating Asymmetry for Energy Efficiency

et al. 2018

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“…[3][4][5][6] These excellent water harvesting creatures elucidate the critical role of wettability irregularity and hierarchical structure gradient in guiding water transport. [23][24][25][26][27][28][29][30] Our previous works have reported the preparation of hydrophobic-to-hydrophilic gradient fabrics that can guide directional water-transport from the hydrophobic to the hydrophilic side. [19][20][21][22] However, most of the water harvesters developed so far are based on either a 2D surface or a 1D filament.…”

mentioning

confidence: 99%

“…[23][24][25][26][27][28][29][30] Our previous works have reported the preparation of hydrophobic-to-hydrophilic gradient fabrics that can guide directional water-transport from the hydrophobic to the hydrophilic side. [23][24][25][26][27][28][29][30] Our previous works have reported the preparation of hydrophobic-to-hydrophilic gradient fabrics that can guide directional water-transport from the hydrophobic to the hydrophilic side.…”

mentioning

confidence: 99%

“…[19][20][21][22] However, most of the water harvesters developed so far are based on either a 2D surface or a 1D filament.Recently, researchers have uncovered that porous membranes with wettability gradient or wettability contrast in thickness direction can have a "smart" directional wicking effect, which enables water to transfer automatically across the membrane just in one direction. [23][24][25][26][27][28][29][30] Our previous works have reported the preparation of hydrophobic-to-hydrophilic gradient fabrics that can guide directional water-transport from the hydrophobic to the hydrophilic side. [31,32] Such a unidirectional water penetration phenomenon was also reported by other researchers.…”

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confidence: 99%

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Novel Water Harvesting Fibrous Membranes with Directional Water Transport Capability

Zhou

Wang

et al. 2019

Adv Materials Inter

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properties assisted in moisture absorption. The Namib Desert beetles and Texas horned lizard collect dew using their bumpy body surface with alternating regions of hydrophilic and hydrophobic, and the honeycomb structures on the scale increase condensation foci. [3][4][5][6] These excellent water harvesting creatures elucidate the critical role of wettability irregularity and hierarchical structure gradient in guiding water transport. [7] Inspired by nature, researchers have developed artificial water harvesters, [7][8][9][10][11][12][13][14][15][16][17][18] such as water collecting filaments and hydrophobichydrophilic patterned fog collectors. [19][20][21][22] However, most of the water harvesters developed so far are based on either a 2D surface or a 1D filament.Recently, researchers have uncovered that porous membranes with wettability gradient or wettability contrast in thickness direction can have a "smart" directional wicking effect, which enables water to transfer automatically across the membrane just in one direction. [23][24][25][26][27][28][29][30] Our previous works have reported the preparation of hydrophobic-to-hydrophilic gradient fabrics that can guide directional water-transport from the hydrophobic to the hydrophilic side. [31,32] Such a unidirectional water penetration phenomenon was also reported by other researchers. In research literatures, the directional water transport was also termed "one-way water transport," "directional wicking," [33][34][35] or "water diode." [36][37][38][39][40] Almost all the directional water transport membranes have a hydrophobic layer on one side and a hydrophilic layer on the other, a typical feature of Janus membranes. However, not all Janus membranes have a directional wicking property because Janus membranes might have bidirectional or nonwicking properties, depending on the hydrophobic/hydrophilic combination layout. [36,38,39] Despite the reports about the preparation and applications of directional wicking porous media, limited attention has been devoted to using them for water harvesting.Herein, we report a novel finding about harvesting water from air using hydrophobic/superhydrophilic directional wicking nanofibrous membranes. A two-step electrospinning method was employed to prepare directional wicking fibrous membranes using polyacrylonitrile (PAN) as a starting material. The directional wicking membranes were found to have much larger water harvesting capacity than those with homogeneous wettability and the same fibrous structure. The porous structure and pore dimension also contributed to water harvesting.Previous studies about water harvesting from airborne moisture, which is driven by a directional water transport principle, are based on either a 2D surface or a 1D filament. Porous membranes with a directional water transport capability are seldom used for water harvesting. Herein, a novel hydrophobic/ hydrophilic directional-wicking nanofibrous membrane is reported showing enhanced water harvesting ability. In comparison to the hydrophobic or hy...

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“…It is well established that heart valve leaflet tissues have an intricate, heterogeneous, and multilayered structure that plays important roles in homeostatic maintenance and adaptive valvular remodeling. 19,21,24,75,[90][91][92][93] On the other hand, we have extensively demonstrated that a detailed account of the extracellular matrix composition or fiber architecture are not essential to obtain a faithful description of MV closure and accurate strains across the leaflet surface. 20,60,77 In addition, although the MV anterior belly region is highly anisotropic, 74,90 a large majority of the leaflet surface consists of smooth transition zones between adjacent MVCT insertion sites, and these regions have been shown to exhibit minimal anisotropy.…”

Section: Insights Into MV Mechanics and Functionmentioning

confidence: 99%

A noninvasive method for the determination of in vivo mitral valve leaflet strains

Rego

Khalighi

Drach

et al. 2018

Numer Methods Biomed Eng

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Assessment of mitral valve (MV) function is important in many diagnostic, prognostic, and surgical planning applications for treatment of MV disease. Yet, to date, there are no accepted noninvasive methods for determination of MV leaflet deformation, which is a critical metric of MV function. In this study, we present a novel, completely noninvasive computational method to estimate MV leaflet in-plane strains from clinical-quality real-time three-dimensional echocardiography (rt-3DE) images. The images were first segmented to produce meshed medial-surface leaflet geometries of the open and closed states. To establish material point correspondence between the two states, an image-based morphing pipeline was implemented within a finite element (FE) modeling framework in which MV closure was simulated by pressurizing the open-state geometry, and local corrective loads were applied to enforce the actual MV closed shape. This resulted in a complete map of local systolic leaflet membrane strains, obtained from the final FE mesh configuration. To validate the method, we utilized an extant in vitro database of fiducially labeled MVs, imaged in conditions mimicking both the healthy and diseased states. Our method estimated local anisotropic in vivo strains with less than 10% error and proved to be robust to changes in boundary conditions similar to those observed in ischemic MV disease. Next, we applied our methodology to ovine MVs imaged in vivo with rt-3DE and compared our results to previously published findings of in vivo MV strains in the same type of animal as measured using surgically sutured fiducial marker arrays. In regions encompassed by fiducial markers, we found no significant differences in circumferential(P = 0.240) or radial (P = 0.808) strain estimates between the marker-based measurements and our novel noninvasive method. This method can thus be used for model validation as well as for studies of MV disease and repair.

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Engineering anisotropic biphasic Janus‐type polymer nanofiber scaffold networks via centrifugal jet spinning

Cited by 29 publications

References 24 publications

Janus Membranes: Creating Asymmetry for Energy Efficiency

Janus Membranes: Creating Asymmetry for Energy Efficiency

Novel Water Harvesting Fibrous Membranes with Directional Water Transport Capability

A noninvasive method for the determination of in vivo mitral valve leaflet strains

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