Search results for: Reinhold H. Dauskardt

Items from 1 to 20 out of 97 results

article

Linking Interfacial Bonding and Thermal Conductivity in Molecularly‐Confined Polymer‐Glass Nanocomposites with Ultra‐High Interfacial Density

Yang Wang, David W. Collinson, Heungdong Kwon, Robert D. Miller, more

Small > 19 > 28 > n/a - n/a

Thermal transport in polymer nanocomposites becomes dependent on the interfacial thermal conductance due to the ultra‐high density of the internal interfaces when the polymer and filler domains are intimately mixed at the nanoscale. However, there is a lack of experimental measurements that can link the thermal conductance across the interfaces to the chemistry and bonding between the polymer molecules...

article

From decoding the perception of tightness to a clinical proof of soothing effects derived from natural ingredients in a moisturizer

Sebastian Hendrickx‐Rodriguez, Sophie Connetable, Barbara Lynch, Joseph Pace, more

International Journal of Cosmetic Science > 44 > 5 > 486 - 499

Objective To decode the feeling of skin tightness after application of a cosmetic product and how to soothe this discomfort. To pursue this aim, we considered the ingredient's effect on stratum corneum (SC) biomechanics to differentiate between consumers prone to tightness from those that are not and correlate these effects with mechanoreceptor activation. Methods In vivo clinical trials were used...

article

Comprehensive characterization of the structure and properties of human stratum corneum relating to barrier function and skin hydration: modulation by a moisturizer formulation

Marie‐Florence Galliano, Ali Tfayli, Reinhold H. Dauskardt, Bruno Payre, more

Experimental Dermatology > 30 > 9 > 1352 - 1357

The stratum corneum (SC) is key in the maintenance of the biomechanical barrier and hydration of skin. Our previous investigations showed beneficial effects of a combination of emollients on water capture and retention and protein and lipid organization, all of which are linked to dryness and dry skin damage. Here, we show how a formulation containing an emollient combination (“Trio”) and its basal...

article

Thermal‐Disrupting Interface Mitigates Intercellular Cohesion Loss for Accurate Topical Antibacterial Therapy

Benhui Hu, Christopher Berkey, Timothy Feliciano, Xiaohong Chen, more

Advanced Materials > 32 > 12 > n/a - n/a

Bacterial infections remain a leading threat to global health because of the misuse of antibiotics and the rise in drug‐resistant pathogens. Although several strategies such as photothermal therapy and magneto‐thermal therapy can suppress bacterial infections, excessive heat often damages host cells and lengthens the healing time. Here, a localized thermal managing strategy, thermal‐disrupting interface...

article

An Intrinsically Stretchable High‐Performance Polymer Semiconductor with Low Crystallinity

Yu Zheng, Ging‐Ji Nathan Wang, Jiheong Kang, Mark Nikolka, more

Advanced Functional Materials > 29 > 46 > n/a - n/a

For wearable and implantable electronics applications, developing intrinsically stretchable polymer semiconductor is advantageous, especially in the manufacturing of large‐area and high‐density devices. A major challenge is to simultaneously achieve good electrical and mechanical properties for these semiconductor devices. While crystalline domains are generally needed to achieve high mobility, amorphous...

article

Design of Ultrastiff Organosilicate Hybrid Glasses

Karsu I. Kilic, Reinhold H. Dauskardt

Advanced Functional Materials > 29 > 44 > n/a - n/a

Hyperconnected hybrid organosilicate glass networks formed by hyperstiff precursor molecules with certain geometrical characteristics can lead to exceptional elastic properties superior to that of fully dense silica. Carbon‐ and silicon‐containing precursors with defined molecular planarity are introduced and a new design strategy where both the network connectivity and the precursor geometry are...

article

Surface Chemical Functionalization to Achieve Extreme Levels of Molecular Confinement in Hybrid Nanocomposites

Can Wang, Scott G. Isaacson, Yucheng Wang, Krystelle Lionti, more

Advanced Functional Materials > 29 > 33 > n/a - n/a

Polymer confinement is realized in hybrid nanocomposites where individual polymer molecules are confined by a nanoporous matrix to dimensions less than the molecular size of the polymer. Here it is shown that by functionalizing the interior pore surfaces of a nanoporous organosilicate matrix, the pores can be filled with polystyrene molecules to achieve extreme levels of molecular confinement not...

article

Tearing and reliability of photovoltaic module backsheets

Pak Yan Yuen, Stephanie L. Moffitt, Fernando D. Novoa, Laura T. Schelhas, more

Progress in Photovoltaics: Research and Applications > 27 > 8 > 693 - 705

The backsheet in photovoltaic modules belongs to an important class of layered materials where the tearing behavior of the individual layers does not necessarily represent the tearing behavior of the entire backsheet. Such characteristic arises from the interaction between the individual layers during the tearing process, where one layer of the backsheet is mechanically constrained by its neighboring...

article

Open Air Plasma Deposition of Superhydrophilic Titania Coatings

Michael Q. Hovish, Florian Hilt, Nicholas Rolston, Qiran Xiao, more

Advanced Functional Materials > 29 > 19 > n/a - n/a

A method for the deposition and functionalization of a nanostructured organotitanate thin film, which imparts superhydrophilicity to a surface with a one‐step, open‐air process, is described. Extreme wetting (Θ < 5°) is achieved through synergistic contributions from both nanoscale roughness, visible light absorption caused by nonmetal dopants, and oxygen vacancies and surface activation by reactive...

article

Photovoltaic Devices: High Performance Roll‐to‐Roll Produced Fullerene‐Free Organic Photovoltaic Devices via Temperature‐Controlled Slot Die Coating (Adv. Funct. Mater. 6/2019)

Seok‐In Na, You‐Hyun Seo, Yoon‐Chae Nah, Seok‐Soon Kim, more

Advanced Functional Materials > 29 > 6 > n/a - n/a

In article number 1805825, Seok‐In Na, Doojin Vak, and co‐workers develop hot slot die deposition using a 3D printing platform and the optimized parameters are translated to the roll‐to‐roll deposition system to produce high performance flexible organic solar cells with a non‐fullerene‐based formulation. The key approach of this work is heating both the slot die head and the substrate during the deposition...

article

High Performance Roll‐to‐Roll Produced Fullerene‐Free Organic Photovoltaic Devices via Temperature‐Controlled Slot Die Coating

Seok‐In Na, You‐Hyun Seo, Yoon‐Chae Nah, Seok‐Soon Kim, more

Advanced Functional Materials > 29 > 6 > n/a - n/a

Solution‐processed organic photovoltaics (OPVs) have continued to show their potential as a low‐cost power generation technology; however, there has been a significant gap between device efficiencies fabricated with lab‐scale techniques—i.e., spin coating—and scalable deposition methods. Herein, temperature‐controlled slot die deposition is developed for the photoactive layer of OPVs. The influence...

article

Measurement of the biomechanical function and structure of ex vivo drying skin using raman spectral analysis and its modulation with emollient mixtures

Krysta Biniek, Ali Tfayli, Raoul Vyumvuhore, Alessia Quatela, more

Experimental Dermatology > 27 > 8 > 901 - 908

An important aspect of the biomechanical behaviour of the stratum corneum (SC) is the drying stresses that develop with water loss. These stresses act as a driving force for damage in the form of chapping and cracking. Betasitosterol is a plant sterol with a structure similar to cholesterol, a key component in the intercellular lipids of the outermost layer of human skin, the SC. Cholesterol plays...

article

A Silica‐Aerogel‐Reinforced Composite Polymer Electrolyte with High Ionic Conductivity and High Modulus

Dingchang Lin, Pak Yan Yuen, Yayuan Liu, Wei Liu, more

Advanced Materials > 30 > 32 > n/a - n/a

High‐energy all‐solid‐state lithium (Li) batteries have great potential as next‐generation energy‐storage devices. Among all choices of electrolytes, polymer‐based systems have attracted widespread attention due to their low density, low cost, and excellent processability. However, they are generally mechanically too weak to effectively suppress Li dendrites and have lower ionic conductivity for reasonable...

article

Influence of Bulky Organo‐Ammonium Halide Additive Choice on the Flexibility and Efficiency of Perovskite Light‐Emitting Devices

Lianfeng Zhao, Nicholas Rolston, Kyung Min Lee, Xunhua Zhao, more

Advanced Functional Materials > 28 > 31 > n/a - n/a

Perovskite light‐emitting diodes (LEDs) require small grain sizes to spatially confine charge carriers for efficient radiative recombination. As grain size decreases, passivation of surface defects becomes increasingly important. Additionally, polycrystalline perovskite films are highly brittle and mechanically fragile, limiting their practical applications in flexible electronics. In this work, the...

article

Poly(triarylamine) composites with carbon nanomaterials for highly transparent and conductive coatings

Silvia G. Prolongo, Adam D. Printz, Nicholas Rolston, Brian L. Watson, more

Thin Solid Films > 2018 > 646 > C > 61-66

We report on the fabrication of transparent, conductive, mechanically robust electrode composites of poly(triarylamine) (PTAA) doped with different concentrations of carbon nanotubes (CNTs) or graphene nanoplatelets (GNPs). Additionally, the effects of nanofiller surface modification with amines were characterized by comparing the transparency, conductivity, and mechanical properties to composites...

article

Molecular design of confined organic network hybrids with controlled deformation rate sensitivity and moisture resistance

Yichuan Ding, Qiran Xiao, Reinhold H. Dauskardt

Acta Materialia > 2018 > 142 > C > 162-171

We demonstrate molecular design strategies for engineering the deformation rate sensitivity and fracture resistance of organic-inorganic hybrid films in moist environment. Hybrids with intimate mixing of inorganic and organic molecular networks were synthesized with an epoxy-functionalized silane, (3-glycidoxypropyl) trimethoxysilane and an acetate-stabilized zirconium alkoxide, tetra-n-propoxyzirconium...

article

Effect of heat, UV radiation, and moisture on the decohesion kinetics of inverted organic solar cells

Nicholas Rolston, Adam D. Printz, Stephanie R. Dupont, Eszter Voroshazi, more

Solar Energy Materials and Solar Cells > 2017 > 170 > C > 239-245

Organic solar cells subjected to environmental stressors such as heat, moisture, and UV radiation can undergo significant mechanical degradation, leading to delamination of layers and device failure. This paper reports the effect these stressors have on the mechanical integrity of active layers and interfaces as measured by subcritical debonding tests, and the in situ evolution of defects and fracture...

article

An Artificial Solid Electrolyte Interphase with High Li‐Ion Conductivity, Mechanical Strength, and Flexibility for Stable Lithium Metal Anodes

Yayuan Liu, Dingchang Lin, Pak Yan Yuen, Kai Liu, more

Advanced Materials > 29 > 10 > n/a - n/a

An artificial solid electrolyte interphase (SEI) is demonstrated for the efficient and safe operation of a lithium metal anode. Composed of lithium‐ion‐conducting inorganic nanoparticles within a flexible polymer binder matrix, the rationally designed artificial SEI not only mechanically suppresses lithium dendrite formation but also promotes homogeneous lithium‐ion flux, significantly enhancing the...

article

Mechanical integrity of solution-processed perovskite solar cells

Nicholas Rolston, Brian L. Watson, Colin D. Bailie, Michael D. McGehee, more

Extreme Mechanics Letters > 2016 > 9 > Part 3 > 353-358

Low-cost solar technologies such as perovskite solar cells are not only required to be efficient, but durable too, exhibiting chemical, thermal and mechanical stability. To determine the mechanical stability of perovskite solar cells, the fracture resistance of a multitude of solution-processed organometal trihalide perovskite films and cells utilizing these films were studied. The influence of stoichiometry,...

article

Degradation of thermally-cured silicone encapsulant under terrestrial UV

Can Cai, David C. Miller, Ian A. Tappan, Reinhold H. Dauskardt

Solar Energy Materials and Solar Cells > 2016 > 157 > C > 346-353

Concentrator photovoltaic (CPV) modules operate in extreme conditions, including enhanced solar flux, elevated operating temperature, and frequent thermal cycling. Coupled with active environmental species such as oxygen and moisture, the operating conditions pose a unique materials challenge for guaranteeing operational lifetimes of greater than 25 years. Specifically, the encapsulants used in the...

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INFONA - science communication portal

Search results for: Reinhold H. Dauskardt

Linking Interfacial Bonding and Thermal Conductivity in Molecularly‐Confined Polymer‐Glass Nanocomposites with Ultra‐High Interfacial Density

From decoding the perception of tightness to a clinical proof of soothing effects derived from natural ingredients in a moisturizer

Comprehensive characterization of the structure and properties of human stratum corneum relating to barrier function and skin hydration: modulation by a moisturizer formulation

Thermal‐Disrupting Interface Mitigates Intercellular Cohesion Loss for Accurate Topical Antibacterial Therapy

An Intrinsically Stretchable High‐Performance Polymer Semiconductor with Low Crystallinity

Design of Ultrastiff Organosilicate Hybrid Glasses

Surface Chemical Functionalization to Achieve Extreme Levels of Molecular Confinement in Hybrid Nanocomposites

Tearing and reliability of photovoltaic module backsheets

Open Air Plasma Deposition of Superhydrophilic Titania Coatings

Photovoltaic Devices: High Performance Roll‐to‐Roll Produced Fullerene‐Free Organic Photovoltaic Devices via Temperature‐Controlled Slot Die Coating (Adv. Funct. Mater. 6/2019)

High Performance Roll‐to‐Roll Produced Fullerene‐Free Organic Photovoltaic Devices via Temperature‐Controlled Slot Die Coating

Measurement of the biomechanical function and structure of ex vivo drying skin using raman spectral analysis and its modulation with emollient mixtures

A Silica‐Aerogel‐Reinforced Composite Polymer Electrolyte with High Ionic Conductivity and High Modulus

Influence of Bulky Organo‐Ammonium Halide Additive Choice on the Flexibility and Efficiency of Perovskite Light‐Emitting Devices

Poly(triarylamine) composites with carbon nanomaterials for highly transparent and conductive coatings

Molecular design of confined organic network hybrids with controlled deformation rate sensitivity and moisture resistance

Effect of heat, UV radiation, and moisture on the decohesion kinetics of inverted organic solar cells

An Artificial Solid Electrolyte Interphase with High Li‐Ion Conductivity, Mechanical Strength, and Flexibility for Stable Lithium Metal Anodes

Mechanical integrity of solution-processed perovskite solar cells

Degradation of thermally-cured silicone encapsulant under terrestrial UV

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