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Chowdhury P, Jha A, Bhandary D. Influence of Temperature-Guided SAM Growth on Wetting and Its Mass Transfer Models. J Phys Chem B 2023; 127:8208-8215. [PMID: 37703434 DOI: 10.1021/acs.jpcb.3c04173] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/15/2023]
Abstract
The formation and growth of self-assembled monolayers (SAMs) composed of amphiphiles have garnered significant attention due to their diverse technical applications. This article reports the findings of molecular dynamics simulations aimed at elucidating the intricate relationship between the wetting behavior of amphiphiles, specifically n-alkanols, and the growth of their SAMs on a mica surface under varying temperature conditions. The investigation quantifies the structural characteristics of the formed SAMs, including density profiles, in-plane radial distribution functions, order parameters, and end-to-end length distributions of n-alkanol molecules within the SAM. Thermodynamic properties, such as the second virial coefficient and excess entropy, are examined in relation to temperature and time. The growth of the SAM is assessed by analyzing characteristic time scales at different temperatures and in-plane diffusion of n-alkanol molecules and utilizing classical theories of mass transfer to quantify the growth rate as a function of temperature. These results are then correlated with changes in the contact angle and spreading coefficient of n-alkanol droplets on the mica surface over time, providing insights into the impact of SAM growth on the wetting behavior and the mass transfer model of such systems.
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Affiliation(s)
- Prateek Chowdhury
- Department of Chemical Engineering and Technology, Indian Institute of Technology (BHU) Varanasi, Varanasi, UP 221005, India
| | - Ayush Jha
- Department of Chemical Engineering and Technology, Indian Institute of Technology (BHU) Varanasi, Varanasi, UP 221005, India
| | - Debdip Bhandary
- Department of Chemical Engineering and Technology, Indian Institute of Technology (BHU) Varanasi, Varanasi, UP 221005, India
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2
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Azimi Yancheshme A, Palmese GR, Alvarez NJ. A generalized scaling theory for spontaneous spreading of Newtonian fluids on solid substrates. J Colloid Interface Sci 2023; 636:677-688. [PMID: 36680958 DOI: 10.1016/j.jcis.2023.01.025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Revised: 01/03/2023] [Accepted: 01/05/2023] [Indexed: 01/09/2023]
Abstract
HYPOTHESIS There exists a generalized solution for the spontaneous spreading dynamics of droplets taking into account the influence of interfacial tension and gravity. EXPERIMENTS This work presents a generalized scaling theory for the problem of spontaneous dynamic spreading of Newtonian fluids on a flat substrate using experimental analysis and numerical simulations. More specifically, we first validate and modify a dynamic contact angle model to accurately describe the dependency of contact angle on the contact line velocity, which is generalized by the capillary number. The dynamic contact model is implemented into a two-phase moving mesh computational fluid dynamics (CFD) model, which is validated using experimental results. FINDINGS We show that the spreading process is governed by three important parameters: the Bo number, viscous timescale τviscous, and static advancing contact angle, θs. More specifically, there exists a master spreading curve for a specific Bo and θs by scaling the spreading time with the τviscous. Moreover, we developed a correlation for prediction of the equilibrium shape of the droplets as a function of both Bo and θs. The results of this study can be used in a wide range of applications to predict both dynamic and equilibrium shape of droplets, such as in droplet-based additive manufacturing.
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Affiliation(s)
| | - Giuseppe R Palmese
- Chemical and Biological Engineering, Drexel University, Philadelphia, PA 19104, USA
| | - Nicolas J Alvarez
- Chemical and Biological Engineering, Drexel University, Philadelphia, PA 19104, USA
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3
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Pathak B, Christy J. Evaporation dynamics of a sessile milk droplet placed on a hydrophobic surface. Colloids Surf A Physicochem Eng Asp 2023. [DOI: 10.1016/j.colsurfa.2023.131207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/05/2023]
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4
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Spindler LM, Serpetsi S, Flamm J, Feuerhake A, Böhler L, Pravda M, Borchers K, Tovar GE, Schindowski K, Gruber-Traub C. Hyaluronate spreading validates mucin-agarose analogs as test systems to replace porcine nasal mucosa explants: An experimental and theoretical investigation. Colloids Surf B Biointerfaces 2022. [DOI: 10.1016/j.colsurfb.2022.112689] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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5
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Fabrication of Gelatin Nanofibers by Electrospinning-Mixture of Gelatin and Polyvinyl Alcohol. Polymers (Basel) 2022; 14:polym14132610. [PMID: 35808656 PMCID: PMC9269508 DOI: 10.3390/polym14132610] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2022] [Revised: 06/19/2022] [Accepted: 06/20/2022] [Indexed: 02/01/2023] Open
Abstract
Gelatin, one of the most abundant, naturally derived biomacromolecules from collagen, is widely applicable in food additives, cosmetic ingredients, drug formulation, and wound dressing based on their non-toxicity and biodegradability. In parallel, polyvinyl alcohol (PVA), a synthetic polymer, has been commonly applied as a thickening agent for coating processes in aqueous systems and a major component in healthcare products for cartilage replacements, eye lubrication, and contact lenses. In this study, a new type of mixed hydrogel nanofiber was fabricated from gelatin and polyvinyl alcohol by electrospinning under a feasible range of polymer compositions. To determine the optimal composition of gelatin and polyvinyl alcohol in nanofiber fabrication, several key physicochemical properties of mixed polymer solutions such as viscosity, surface tension, pH, and electrical conductance were thoroughly characterized by a viscometer, surface tensiometer, water analyzer, and carbon electron probe. Moreover, the molecular structures of polymeric chains within mixed hydrogel nanofibers were investigated with Fourier-transform infrared spectroscopy. The morphologies and surface elemental compositions of the mixed hydrogel nanofibers were examined by the scanning electron microscope and energy-dispersive X-ray spectroscopy, respectively. The measurement of water contact angles was performed for measuring the hydrophilicity of nanofiber surfaces. Most importantly, the potential cytotoxicity of the electrospun nanofibers was evaluated by the in vitro culture of 3T3 fibroblasts. Through our extensive study, it was found that a PVA-rich solution (a volumetric ratio of gelatin/polyvinyl alcohol <1) would be superior for the efficient production of mixed hydrogel nanofibers by electrospinning techniques. This result is due to the appropriate balance between the higher viscosity (~420−~4300 10−2 poise) and slightly lower surface tension (~35.12−~32.68 mN/m2) of the mixed polymer solution. The regression on the viscosity data also found a good fit by the Lederer−Rougier’s model for a binary mixture. For the hydrophilicity of nanofibers, the numerical analysis estimates that the value of interfacial energy for the water contact on nanofibers is around ~−0.028 to ~−0.059 J/m2.
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6
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Jo M, Noh J, Cho G, Lee TM, Oh B, Nam S, Lee C. Strain Optimization of Tensioned Web through Computational Fluid Dynamics in the Roll-to-Roll Drying Process. Polymers (Basel) 2022; 14:polym14122515. [PMID: 35746091 PMCID: PMC9230203 DOI: 10.3390/polym14122515] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Accepted: 06/18/2022] [Indexed: 02/04/2023] Open
Abstract
Unpredictable web temperature distributions in the dryer and strain deviations in the cross-machine (CMD) and machine (MD) directions could hamper the manufacture of smooth functional layers on polymer-based webs through the roll-to-roll (R2R) continuous process system. However, research on this topic is limited. In this study, we developed a structural analysis model using the temperature distribution of the web as a boundary condition to analyze the drying mechanism of the dryer used in an R2R system. Based on the results of this model, we then applied structural modifications to the flow channel and hole density of the aluminum plate of the dryer. The model successfully predicted the temperature and strain distributions of the web inside the dryer in the CMD and MD by forming a tension according to the speed difference of the driven rolls at both ends of the span. Our structural improvements significantly reduced the temperature deviation of the moving web inside the dryer by up to 74% and decreased the strain deviation by up to 46%. The findings can help prevent web unevenness during the drying process of the R2R system, which is essential to minimize the formation of defects on functional layers built over polymer-based webs.
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Affiliation(s)
- Minho Jo
- Department of Mechanical Design and Production Engineering, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Korea; (M.J.); (J.N.)
| | - Jaehyun Noh
- Department of Mechanical Design and Production Engineering, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Korea; (M.J.); (J.N.)
| | - Gyoujin Cho
- Institute of Quantum Biophysics, Sungkyukwan University, 2066 Seobu-ro, Jangan-gu, Suwon 16419, Korea;
| | - Taik-min Lee
- Korea Institute of Machinery and Materials (KIMM), Intelligence and Precision Machinery Research Division, 156 Gajeongbuk-ro, Yuseong-gu, Daejeon 34103, Korea;
| | - Bukuk Oh
- Materials & Production Engineering Research Institute, LG Electronics, 222 LG-ro Jinwi-myeon, Pyeongtaek 17709, Korea;
| | - Sanghoon Nam
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA;
| | - Changwoo Lee
- Department of Mechanical Engineering, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05023, Korea
- Correspondence:
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7
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Schubert DW. Simple Model for the Spreading of Inks in Bioprinting—Revealing Relevant Scaling Laws—Part I Theory. MACROMOL THEOR SIMUL 2021. [DOI: 10.1002/mats.202100032] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Dirk W. Schubert
- Faculty of Engineering, Department of Materials Science, Institute of Polymer Materials Friedrich‐Alexander University Erlangen‐Nürnberg (FAU) Martensstraße 7 Erlangen 91058 Germany
- Bavarian Polymer Institute Key Lab Advanced Fiber Technology Dr.‐Mack‐Straße 77 Fürth 90762 Germany
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8
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Kim S, Lee J, Jo M, Lee C. Numerical Modeling of Ink Widening and Coating Gap in Roll-to-Roll Slot-Die Coating of Solid Oxide Fuel Cell Electrolytic Layer. Polymers (Basel) 2020; 12:polym12122927. [PMID: 33297322 PMCID: PMC7762248 DOI: 10.3390/polym12122927] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2020] [Revised: 12/02/2020] [Accepted: 12/03/2020] [Indexed: 11/16/2022] Open
Abstract
Slot-die coatings are advantageous when used for coating large-area flexible devices; in particular, the coating width can be controlled and simultaneous multi-layer coatings can be processed. To date, the effects of ink widening and the coating gap on the coating thickness have only been considered in a few studies. To this end, we developed two mathematical models to accurately estimate the coating width and thickness that consider these two effects. We used root mean square deviation (RMSD) to experimentally verify the developed method. When the coating gap was increased, the coating width increased and the coating thickness decreased. Experimental results showed that the estimated performances of the coating width and thickness models were as high as 98.46% and 95.8%, respectively. We think that the developed models can be useful for determining the coating conditions according to the ink properties to coat a functional layer with user-defined widths and thicknesses in both lab- and industrial-scale roll-to-roll slot-die coating processes.
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Affiliation(s)
- Seongyong Kim
- Department of Mechanical Design and Production Engineering, Konkuk University, 120, Neungdong-ro, Gwangjin-gu, Seoul 05029, Korea; (S.K.); (M.J.)
| | - Jongsu Lee
- Department of Printed Electronics Engineering, Sunchon National University, 255, Jungang-ro, Jeollanam-do, Suncheon 57922, Korea;
| | - Minho Jo
- Department of Mechanical Design and Production Engineering, Konkuk University, 120, Neungdong-ro, Gwangjin-gu, Seoul 05029, Korea; (S.K.); (M.J.)
| | - Changwoo Lee
- Department of Mechanical Engineering, Konkuk University, 120, Neungdong-ro, Gwangjin-gu, Seoul 05029, Korea
- Correspondence: ; Tel.: +82-2-450-3570; Fax: +82-2-454-0428
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9
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Schrüfer S, Sonnleitner D, Lang G, Schubert DW. A Novel Simple Approach to Material Parameters from Commonly Accessible Rheometer Data. Polymers (Basel) 2020; 12:polym12061276. [PMID: 32503125 PMCID: PMC7362223 DOI: 10.3390/polym12061276] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Revised: 05/25/2020] [Accepted: 05/28/2020] [Indexed: 11/16/2022] Open
Abstract
When characterizing the viscoelastic properties of polymers, shear rheological measurements are commonly the method of choice. These properties are known to affect extrusion and nozzle-based processes such as fiber melt spinning, cast film extrusion and 3D-printing. However, an adequate characterization of shear thinning polymers can be challenging and still insufficient to not only describe but predict process relevant influences. Furthermore, the evaluation of rheological model systems in literature is mostly based on stress–relaxation experiments, which are rarely available for various polymeric materials. Therefore, a simple approach is presented, that can be used to evaluate and benchmark a wide range of rheological model systems based on commonly accessible frequency sweep data. The approach is validated by analyzing alginate PH176 solutions of various concentrations, a thermoplastic poly-urethane (TPU) Elastollan 1180A melt, the liquid silicon rubber Elastosil 7670 and a polycaprolactone (PCL) fiber-alginate composite system. The used rheological model systems, consisting of simple springs and dashpots, are suitable for the description of complex, viscoelastic material properties that can be observed for polymer solutions and gel-like systems. After revealing a suitable model system for describing those material properties, the determination and evaluation of relevant model parameters can take place. We present a detailed guideline for the systematic parameter revelation using alginate solutions of different concentrations as example. Furthermore, a starting point for future correlations of strut spreading in 3D-bioprinting and model parameters is revealed. This work establishes the basis for a better understanding and potential predictability of key parameters for various fabrication techniques.
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Affiliation(s)
- S. Schrüfer
- Department of Materials Science and Engineering, Institute of Polymer Materials, University Erlangen-Nuremberg, Martensstraße 7, 91058 Erlangen, Germany;
- Bavarian Polymer Institute, Key Lab Advanced Fiber Technology, Dr.-Mack-Straße 77, 90762 Fürth, Germany
| | - D. Sonnleitner
- Research Group Biopolymer Processing, University of Bayreuth, Ludwig-Thoma-Straße 36A, 95447 Bayreuth, Germany; (D.S.); (G.L.)
| | - G. Lang
- Research Group Biopolymer Processing, University of Bayreuth, Ludwig-Thoma-Straße 36A, 95447 Bayreuth, Germany; (D.S.); (G.L.)
| | - D. W. Schubert
- Department of Materials Science and Engineering, Institute of Polymer Materials, University Erlangen-Nuremberg, Martensstraße 7, 91058 Erlangen, Germany;
- Bavarian Polymer Institute, Key Lab Advanced Fiber Technology, Dr.-Mack-Straße 77, 90762 Fürth, Germany
- Correspondence:
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10
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Kiparissides C, Vasileiadou A, Karageorgos F, Serpetsi S. A Computational Systems Approach to Rational Design of Nose-to-Brain Delivery of Biopharmaceutics. Ind Eng Chem Res 2020. [DOI: 10.1021/acs.iecr.9b04885] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Costas Kiparissides
- Chemical Process & Energy Resources Institute, 6th km Harilaou-Thermi Road, P.O. Box 60361, 57001 Thessaloniki, Greece
- Department of Chemical Engineering, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
| | - Athina Vasileiadou
- Chemical Process & Energy Resources Institute, 6th km Harilaou-Thermi Road, P.O. Box 60361, 57001 Thessaloniki, Greece
- Department of Chemical Engineering, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
| | - Filippos Karageorgos
- Chemical Process & Energy Resources Institute, 6th km Harilaou-Thermi Road, P.O. Box 60361, 57001 Thessaloniki, Greece
- Department of Chemical Engineering, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
| | - Stefania Serpetsi
- Chemical Process & Energy Resources Institute, 6th km Harilaou-Thermi Road, P.O. Box 60361, 57001 Thessaloniki, Greece
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11
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van der Heijden TWG, Darhuber AA, van der Schoot P. Macroscopic Model for Sessile Droplet Evaporation on a Flat Surface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:12471-12481. [PMID: 30247043 PMCID: PMC6193248 DOI: 10.1021/acs.langmuir.8b02374] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/13/2018] [Revised: 09/20/2018] [Indexed: 06/08/2023]
Abstract
Evaporation of sessile droplets on a flat surface involves a complex interplay between phase change, diffusion, advection, and surface forces. In an attempt to significantly reduce the complexity of the problem and to make it manageable, we propose a simple model hinged on a surface free-energy-based relaxation dynamics of the droplet shape, a diffusive evaporation model, and a contact line pinning mechanism governed by a yield stress. Our model reproduces the known dynamics of droplet shape relaxation and of droplet evaporation, both in the absence and in the presence of contact line pinning. We show that shape relaxation during evaporation significantly affects the lifetime of a drop. We find that the dependence of the evaporation time on the initial contact angle is a function of the competition between the shape relaxation and evaporation and is strongly affected by any contact line pinning.
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Affiliation(s)
- Thijs W. G. van der Heijden
- Department
of Applied Physics, Eindhoven University
of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Anton A. Darhuber
- Department
of Applied Physics, Eindhoven University
of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Paul van der Schoot
- Department
of Applied Physics, Eindhoven University
of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
- Instituut
voor Theoretische Fysica, Universiteit Utrecht, Princetonplein 5, 3584 CC Utrecht, The Netherlands
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12
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Novel color additive for chlorine disinfectants corrects deficiencies in spray surface coverage and wet-contact time and checks for correct chlorine concentration. Am J Infect Control 2018; 46:1188-1191. [PMID: 29680291 DOI: 10.1016/j.ajic.2018.03.008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2018] [Revised: 03/06/2018] [Accepted: 03/07/2018] [Indexed: 11/21/2022]
Abstract
Bleach sprays suffer from poor surface coverage, dry out before reaching proper contact time, and can be inadvertently over-diluted to ineffective concentrations. Highlight®, a novel color additive for bleach that fades to indicate elapsed contact time, maintained >99.9% surface coverage over full contact time and checked for correct chlorine concentration.
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13
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Mattingly AE, Weaver AA, Dimkovikj A, Shrout JD. Assessing Travel Conditions: Environmental and Host Influences On Bacterial Surface Motility. J Bacteriol 2018; 200:e00014-18. [PMID: 29555698 PMCID: PMC5952383 DOI: 10.1128/jb.00014-18] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
The degree to which surface motile bacteria explore their surroundings is influenced by aspects of their local environment. Accordingly, regulation of surface motility is controlled by numerous chemical, physical, and biological stimuli. Discernment of such regulation due to these multiple cues is a formidable challenge. Additionally inherent ambiguity and variability from the assays used to assess surface motility can be an obstacle to clear delineation of regulated surface motility behavior. Numerous studies have reported single environmental determinants of microbial motility and lifestyle behavior but the translation of these data to understand surface motility and bacterial colonization of human host or environmental surfaces is unclear. Here, we describe the current state of the field and our understanding of exogenous factors that influence bacterial surface motility.
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Affiliation(s)
- Anne E. Mattingly
- Department of Civil and Environmental Engineering and Earth Sciences, University of Notre Dame, Notre Dame, Indiana, USA
| | - Abigail A. Weaver
- Department of Civil and Environmental Engineering and Earth Sciences, University of Notre Dame, Notre Dame, Indiana, USA
| | - Aleksandar Dimkovikj
- Department of Civil and Environmental Engineering and Earth Sciences, University of Notre Dame, Notre Dame, Indiana, USA
| | - Joshua D. Shrout
- Department of Civil and Environmental Engineering and Earth Sciences, University of Notre Dame, Notre Dame, Indiana, USA
- Department of Biological Sciences, University of Notre Dame, Notre Dame, Indiana, USA
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14
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Kunai Y, Liu AT, Cottrill AL, Koman VB, Liu P, Kozawa D, Gong X, Strano MS. Observation of the Marcus Inverted Region of Electron Transfer from Asymmetric Chemical Doping of Pristine (n,m) Single-Walled Carbon Nanotubes. J Am Chem Soc 2017; 139:15328-15336. [DOI: 10.1021/jacs.7b04314] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yuichiro Kunai
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Albert Tianxiang Liu
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Anton L. Cottrill
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Volodymyr B. Koman
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Pingwei Liu
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Daichi Kozawa
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Xun Gong
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Michael S. Strano
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
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15
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Model of inertial spreading and imbibition of a liquid drop on a capillary plate. AIChE J 2017. [DOI: 10.1002/aic.15953] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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16
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Stieghorst J, Majaura D, Wevering H, Doll T. Toward 3D Printing of Medical Implants: Reduced Lateral Droplet Spreading of Silicone Rubber under Intense IR Curing. ACS APPLIED MATERIALS & INTERFACES 2016; 8:8239-46. [PMID: 26967063 DOI: 10.1021/acsami.5b12728] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The direct fabrication of silicone-rubber-based individually shaped active neural implants requires high-speed-curing systems in order to prevent extensive spreading of the viscous silicone rubber materials during vulcanization. Therefore, an infrared-laser-based test setup was developed to cure the silicone rubber materials rapidly and to evaluate the resulting spreading in relation to its initial viscosity, the absorbed infrared radiation, and the surface tensions of the fabrication bed's material. Different low-adhesion materials (polyimide, Parylene-C, polytetrafluoroethylene, and fluorinated ethylenepropylene) were used as bed materials to reduce the spreading of the silicone rubber materials by means of their well-known weak surface tensions. Further, O2-plasma treatment was performed on the bed materials to reduce the surface tensions. To calculate the absorbed radiation, the emittance of the laser was measured, and the absorptances of the materials were investigated with Fourier transform infrared spectroscopy in attenuated total reflection mode. A minimum silicone rubber spreading of 3.24% was achieved after 2 s curing time, indicating the potential usability of the presented high-speed-curing process for the direct fabrication of thermal-curing silicone rubbers.
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Affiliation(s)
- Jan Stieghorst
- Cluster of Excellence Hearing4all, 30625 Hannover, Germany
- BioMaterial Engineering, Department of Otorhinolaryngology, Hannover Medical School , Carl-Neuberg-Strasse 1, 30625 Hannover, Germany
| | - Daniel Majaura
- Cluster of Excellence Hearing4all, 30625 Hannover, Germany
- BioMaterial Engineering, Department of Otorhinolaryngology, Hannover Medical School , Carl-Neuberg-Strasse 1, 30625 Hannover, Germany
| | - Hendrik Wevering
- Cluster of Excellence Hearing4all, 30625 Hannover, Germany
- BioMaterial Engineering, Department of Otorhinolaryngology, Hannover Medical School , Carl-Neuberg-Strasse 1, 30625 Hannover, Germany
| | - Theodor Doll
- Cluster of Excellence Hearing4all, 30625 Hannover, Germany
- BioMaterial Engineering, Department of Otorhinolaryngology, Hannover Medical School , Carl-Neuberg-Strasse 1, 30625 Hannover, Germany
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17
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Stieghorst J, Bondarenkova A, Burblies N, Behrens P, Doll T. 3D silicone rubber interfaces for individually tailored implants. Biomed Microdevices 2015; 17:9960. [PMID: 25975600 DOI: 10.1007/s10544-015-9960-y] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
For the fabrication of customized silicone rubber based implants, e.g. cochlear implants or electrocortical grid arrays, it is required to develop high speed curing systems, which vulcanize the silicone rubber before it runs due to a heating related viscosity drop. Therefore, we present an infrared radiation based cross-linking approach for the 3D-printing of silicone rubber bulk and carbon nanotube based silicone rubber electrode materials. Composite materials were cured in less than 120 s and material interfaces were evaluated with scanning electron microscopy. Furthermore, curing related changes in the mechanical and cell-biological behaviour were investigated with tensile and WST-1 cell biocompatibility tests. The infrared absorption properties of the silicone rubber materials were analysed with fourier transform infrared spectroscopy in transmission and attenuated total reflection mode. The heat flux was calculated by using the FTIR data, emissivity data from the infrared source manufacturer and the geometrical view factor of the system.
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18
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Ilton M, Bäumchen O, Dalnoki-Veress K. Onset of Area-Dependent Dissipation in Droplet Spreading. PHYSICAL REVIEW LETTERS 2015; 115:046103. [PMID: 26252697 DOI: 10.1103/physrevlett.115.046103] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2015] [Indexed: 06/04/2023]
Abstract
We probe the viscous relaxation of structured liquid droplets in the partial wetting regime using a diblock copolymer system. The relaxation time of the droplets is measured after a step change in temperature as a function of three tunable parameters: droplet size, equilibrium contact angle, and the viscosity of the fluid. Contrary to what is typically observed, the late-stage relaxation time does not scale with the radius of the droplet-rather, relaxation scales with the radius squared. Thus, the energy dissipation depends on the contact area of the droplet, rather than the contact line.
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Affiliation(s)
- Mark Ilton
- Department of Physics and Astronomy and the Brockhouse Institute for Materials Research, McMaster University, Hamilton, Ontario L8S 4M1, Canada
| | - Oliver Bäumchen
- Max Planck Institute for Dynamics and Self-Organization (MPIDS), 37077 Göttingen, Germany
| | - Kari Dalnoki-Veress
- Department of Physics and Astronomy and the Brockhouse Institute for Materials Research, McMaster University, Hamilton, Ontario L8S 4M1, Canada
- Laboratoire de Physico-Chimie Théorique, UMR CNRS 7083 Gulliver, ESPCI ParisTech, PSL Research University, Paris, France
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Development of bioactive glass based scaffolds for controlled antibiotic release in bone tissue engineering via biodegradable polymer layered coating. Biointerphases 2014; 9:041001. [DOI: 10.1116/1.4897217] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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Causa A, Filippone G, Acierno D, Domingo C, Salerno A. Surface Morphology, Crystallinity, and Hydrophilicity of Poly(ε-caprolactone) Films Prepared Via Casting of Ethyl Lactate and Ethyl Acetate Solutions. MACROMOL CHEM PHYS 2014. [DOI: 10.1002/macp.201400381] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Andrea Causa
- Department of Chemical, Materials and Production Engineering (DICMaPI); University of Naples Federico II; P.le Tecchio 80 80125 Naples Italy
| | - Giovanni Filippone
- Department of Chemical, Materials and Production Engineering (DICMaPI); University of Naples Federico II; P.le Tecchio 80 80125 Naples Italy
| | - Domenico Acierno
- INSTM - Reference Centre for Processing Technologies of Polymer and Composites; University of Naples Federico II; Naples Italy
| | - Concepción Domingo
- Institute of Materials Science of Barcelona (ICMAB-CSIC); Campus de la UAB s/n 08193 Bellaterra Spain
| | - Aurelio Salerno
- Institute of Materials Science of Barcelona (ICMAB-CSIC); Campus de la UAB s/n 08193 Bellaterra Spain
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Qazi TH, Rai R, Dippold D, Roether JE, Schubert DW, Rosellini E, Barbani N, Boccaccini AR. Development and characterization of novel electrically conductive PANI-PGS composites for cardiac tissue engineering applications. Acta Biomater 2014; 10:2434-45. [PMID: 24561709 DOI: 10.1016/j.actbio.2014.02.023] [Citation(s) in RCA: 161] [Impact Index Per Article: 16.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2013] [Revised: 01/26/2014] [Accepted: 02/11/2014] [Indexed: 12/31/2022]
Abstract
Cardiovascular diseases, especially myocardial infarction, are the leading cause of morbidity and mortality in the world, also resulting in huge economic burdens on national economies. A cardiac patch strategy aims at regenerating an infarcted heart by providing healthy functional cells to the injured region via a carrier substrate, and providing mechanical support, thereby preventing deleterious ventricular remodeling. In the present work, polyaniline (PANI) was doped with camphorsulfonic acid and blended with poly(glycerol-sebacate) at ratios of 10, 20 and 30vol.% PANI content to produce electrically conductive composite cardiac patches via the solvent casting method. The composites were characterized in terms of their electrical, mechanical and physicochemical properties. The in vitro biodegradability of the composites was also evaluated. Electrical conductivity increased from 0Scm(-1) for pure PGS to 0.018Scm(-1) for 30vol.% PANI-PGS samples. Moreover, the conductivities were preserved for at least 100h post fabrication. Tensile tests revealed an improvement in the elastic modulus, tensile strength and elasticity with increasing PANI content. The degradation products caused a local drop in pH, which was higher in all composite samples compared with pure PGS, hinting at a buffering effect due to the presence of PANI. Finally, the cytocompatibility of the composites was confirmed when C2C12 cells attached and proliferated on samples with varying PANI content. Furthermore, leaching of acid dopants from the developed composites did not have any deleterious effect on the viability of C2C12 cells. Taken together, these results confirm the potential of PANI-PGS composites for use as substrates to modulate cellular behavior via electrical stimulation, and as biocompatible scaffolds for cardiac tissue engineering applications.
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Affiliation(s)
- Taimoor H Qazi
- Institute of Biomaterials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Cauerstr. 6, 91058 Erlangen, Germany
| | - Ranjana Rai
- Institute of Biomaterials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Cauerstr. 6, 91058 Erlangen, Germany.
| | - Dirk Dippold
- Institute of Biomaterials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Cauerstr. 6, 91058 Erlangen, Germany
| | - Judith E Roether
- Institute of Polymer Materials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, 91058 Erlangen, Germany
| | - Dirk W Schubert
- Institute of Polymer Materials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, 91058 Erlangen, Germany
| | - Elisabetta Rosellini
- Department of Civil and Industrial Engineering, Largo Lucio Lazzarino, 56126 Pisa, Italy
| | - Niccoletta Barbani
- Department of Civil and Industrial Engineering, Largo Lucio Lazzarino, 56126 Pisa, Italy
| | - Aldo R Boccaccini
- Institute of Biomaterials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Cauerstr. 6, 91058 Erlangen, Germany.
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Rai R, Tallawi M, Barbani N, Frati C, Madeddu D, Cavalli S, Graiani G, Quaini F, Roether JA, Schubert DW, Rosellini E, Boccaccini AR. Biomimetic poly(glycerol sebacate) (PGS) membranes for cardiac patch application. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2013; 33:3677-87. [DOI: 10.1016/j.msec.2013.04.058] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2013] [Revised: 04/12/2013] [Accepted: 04/26/2013] [Indexed: 10/26/2022]
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