Gradient nanocomposite printing by dip pen nanolithography

Kandemir, Ayse Cagil; Ramakrishna, Shivaprakash N.; Erdem, Derya; Courty, Diana; Spolenak, Ralph

doi:10.1016/j.compscitech.2016.11.024

Cited by 10 publications

(6 citation statements)

References 18 publications

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“…This further facilitates network formation by overcoming the mechanical percolation threshold 45 . This phenomenon was confirmed in the previous study by Kandemir et al, 38 which is not typical in tensile tests since large agglomerations would lead to crack propagation in tensile loading. The indentation test curves (Figure 8) demonstrate that the indentation depth on PVP and nanocomposite films ranges from 400 to 1200 nm.…”

Section: Resultssupporting

confidence: 81%

“…However, the literature does not focus much on the mechanical effect of aggregated nano‐reinforcements under compressive loads. The previous study of the author 38 showed that aggregated nano‐spherical particles under the Berkovich tip leading to order of magnitude improvements in elastic modulus and hardness values of the nanocomposites. The effect of aggregation on nanoclay reinforcement under compressive stress was the first discussed in this study.…”

Section: Introductionmentioning

confidence: 95%

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Biocompatible organic coating fabrication via polymer/clay nanocomposites: Evaluation of mechanical improvements

Kandemir,

Donmez,

Can

2023

Polymer Composites

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This study focuses on achieving mechanical enhancements in biocompatible organic coatings. A solvent‐based method is employed to produce biocompatible nanocomposites using polyvinylpyrrolidone (PVP) and bentonite nanoclays (BNT) as constituents to achieve this objective. Subsequently, the nanocomposites are spin‐coated onto a glass substrate, resulting in smooth and defect‐free films with a thickness of 5 μm. Through instrumented‐indentation testing, it is observed that BNT reinforcement leads to significant improvements in mechanical properties. Specifically, the addition of 0.5, 1, and 5 wt% of BNT in PVP results in enhancements of 105%, 77%, and 430% in elastic modulus, respectively, while hardness is improved by 166%, 211%, and 448%, respectively. The considerable improvements in the composite modulus cannot be adequately explained by assuming perfect adhesion between the constituents of the composite (as suggested by the Halpin–Tsai model) or by considering the contributions from the interface/network of silicate layers (as proposed by the Modified Halpin–Tsai model). Instead, the significant enhancements in hardness and modulus values are primarily attributed to a notable increase in the BNT volume fraction, ranging from 4 to 9 times, occurring under the Berkovich tip due to the aggregated silicate layers. The findings highlight the role of aggregated silicate layers in enhancing both hardness and modulus and contribute to the development of advanced biocompatible coatings with improved mechanical properties.Highlights Enhanced mechanical properties in biocompatible coatings. Biocompatible nanocomposites of polyvinylpyrrolidone (PVP) and bentonite nanoclays (BNT). Spin‐coated nanocomposite films on glass: smooth, defect‐free, 5 μm thick. BNT reinforcement boosts elastic modulus and hardness of PVP. Aggregated silicate layers under compression drive substantial mechanical improvements.

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Section: Resultssupporting

confidence: 81%

Section: Introductionmentioning

confidence: 95%

Biocompatible organic coating fabrication via polymer/clay nanocomposites: Evaluation of mechanical improvements

Kandemir,

Donmez,

Can

2023

Polymer Composites

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“…The PMMA was chosen because it is inert to the electrochemical process and is a common polymer for patterning by the DPN method. [54][55][56][57] The GOD is part of the mixture used as an ink. The bindings between the surface and the GOD are intermolecular bonds.…”

Section: Resultsmentioning

confidence: 99%

“…PMMA does not evaporate during the patterning process and connects strongly to various surfaces, making the electrode recyclable. The PMMA was chosen because it is inert to the electrochemical process and is a common polymer for patterning by the DPN method [54–57] . The GOD is part of the mixture used as an ink.…”

Section: Resultsmentioning

confidence: 99%

Glucose Oxidase Patterned Meta‐Chemical Surface for Sensing Glucose Using Dip‐Pen Nanolithography

Saban,

Shamir,

Zohar

et al. 2023

ChemElectroChem

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Numerous studies have been done to advance the development of efficient, simple, and cheap sensors, especially for glucose, which are important in the pharmaceutical and food industries. The most common sensors and biosensors used today are based on electrochemistry. The novelty of this study is the use of dip‐pen nanolithography (DPN) in order to pattern a mixture of glucose oxidase with PMMA as nanoclusters and develop meta‐chemical surface (MCS), which leads to highly efficient working electrodes with increased detection sensitivity compared to the today‐known glucose sensors ( M was detected in the current study). Our novel and important results support the feasibility of using DPN to develop sensors on various electrode surfaces patterned with different active species, especially in systems requiring target substance detection over large concentration ranges.

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“…An alternative is the so-called transfer printing technique. A probe with a nano–micro tip is a basic tool, and the induced surface tension gradient on its surface is utilized to drive the liquid to load onto the tip. − Since the ultrahigh flow resistance in the closed microchannel has been eliminated, it is potentially suitable to dispense a high-viscous liquid. However, the volume of the loaded droplet on the probe has been proved to have a non-negligible influence on the size of the printed dots.…”

Section: Introductionmentioning

confidence: 99%

Loading a High-Viscous Droplet via the Cone-Shaped Liquid Bridge Induced by an Electrostatic Force

Wang

et al. 2021

Langmuir

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In transfer printing, the loaded droplet on the probe has a significant influence on the dispensing resolution. A suitable loading approach for a high-viscous liquid is highly required. Herein, a novel electrostatic loading method is presented, in which the main aim is to control precisely the formation and breaking of a cone-shaped liquid bridge. An experimental device is developed. The influence of electrical and geometric parameters on the feature size of the liquid bridge is investigated in detail. In the formation of the liquid bridge, the increase of voltage or the decrease of the air gap can enhance the electric field intensity, thus reducing the formation period and increasing the initial cone tip diameter of the liquid cone. After the liquid bridge is formed, both the circuit current implying the liquid wetted area on the probe surface and the lifting velocity of the probe are utilized to further regulate the volume of the loaded droplet. Loaded droplets ranging from 60 to 600 pL are obtained via the method with a standard deviation of 4 to 30 pL. Moreover, a dot array is transferred with different loaded droplets. The minimum diameter of the printed dots is about 140 μm with a variation less than 5%. The advantages include the reduced risk of contamination, the droplet-size independent of the size of the probe, and the low cost of the device.

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Gradient nanocomposite printing by dip pen nanolithography

Cited by 10 publications

References 18 publications

Biocompatible organic coating fabrication via polymer/clay nanocomposites: Evaluation of mechanical improvements

Biocompatible organic coating fabrication via polymer/clay nanocomposites: Evaluation of mechanical improvements

Glucose Oxidase Patterned Meta‐Chemical Surface for Sensing Glucose Using Dip‐Pen Nanolithography

Loading a High-Viscous Droplet via the Cone-Shaped Liquid Bridge Induced by an Electrostatic Force

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