Gold nanorods or nanospheres? Role of particle shape on tuning the shape memory effect of semicrystalline poly(ε-caprolactone) networks

Xu, Haikun; Budhlall, Bridgette M.

doi:10.1039/c8ra06715e

Cited by 9 publications

(4 citation statements)

References 43 publications

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“…For example, while it is possible to tune the optical properties of anisotropic silver or gold nanorods throughout the visible, near-infrared, and infrared regions by variation of the aspect ratio, it is not possible when increasing the diameter of spherical Au nanoparticles. Au nanorod-incorporated semicrystalline poly(ε-caprolactone) networks resulted in a faster shape recovery process than Au nanosphere-incorporated networks . Lanthanum hexaboride nanorods exhibit more efficient field emission properties than spherical particles of the same composition .…”

Section: Introductionmentioning

confidence: 99%

“…Au nanorod-incorporated semicrystalline poly(ε-caprolactone) networks resulted in a faster shape recovery process than Au nanosphere-incorporated networks. 11 Lanthanum hexaboride nanorods exhibit more efficient field emission properties than spherical particles of the same composition. 12 Saturation magnetization of NiMnO 3 nanostrucures increases with an increase in the aspect ratio of nanorods.…”

Section: Introductionmentioning

confidence: 99%

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Mechanistic Investigations of Growth of Anisotropic Nanostructures in Reverse Micelles

et al. 2021

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Tailoring the characteristics of anisotropic nanostructures like size, morphology, aspect ratio, and size dispersity is of extreme importance due to the unique and tunable properties including catalytic, optical, photocatalytic, magnetic, photochemical, electrochemical, photoelectrochemical, and several other physical properties. The reverse microemulsion (RM) method offers a useful soft-template and low-temperature procedure that, by variation of experimental conditions and nature of reagents, has proved to be extremely versatile in synthesis of nanostructures with tailored properties. Although many reports of synthesis of nanostructures by the RM method exist in the literature, most of the research studies carried out still follow the "hit and trial" method where the synthesis conditions, reagents, and other factors are varied and the resulting characteristics of the obtained nanostructures are justified on the basis of existing physical chemistry principles. Mechanistic investigations are scarce to generate a set of empirical rules that would aid in preplanning the RM-based synthesis of nanostructures with desired characteristics as well as make the process viable on an industrial scale. A consolidation of such research data available in the literature is essential for providing future directions in the field. In this perspective, we analyze the literature reports that have investigated the mechanistic aspects of growth of anisotropic nanostructures using the RM method and distil the essence of the present understanding at the nanoscale timescale using techniques like FCS and ultrafast spectroscopy in addition to routine techniques like DLS, fluorescence, TEM, etc.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mechanistic Investigations of Growth of Anisotropic Nanostructures in Reverse Micelles

et al. 2021

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“…Since then, more biodegradable stents made of various materials continued to emerge and improve by addressing numerous issues [6][7][8][9]. Recently, we reported on biodegradable, infrared light-actuated PCL cinnamatemodified block copolymers that can potentially serve as temporary cardiovascular stents [10]. The copolymers are a novel type of shape memory polymer with designed biodegradability and biocompatibility.…”

Section: Introductionmentioning

confidence: 99%

“…The copolymers are a novel type of shape memory polymer with designed biodegradability and biocompatibility. Their shape-memory properties were studied and the shape transitions from a compact strip to a helical coil activated by infrared laser beam were demonstrated [10].…”

Section: Introductionmentioning

confidence: 99%

In-vitro biodegradation study of poly( ε -caprolactone) films using a 3D printed helical flow prototype to simulate the physiological conditions for cardiovascular implanted devices

Chasse¹,

Xu²,

Budhlall³

2019

Biomed. Phys. Eng. Express

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Current in-vitro biodegradation test methods for characterizing bioabsorbable polymer implants including ASTM F1635-11, focus on testing mechanical and chemical properties of samples under static conditions. These tests oversimplify the implant service environment and yield limited data due to the lack of fluid flow, stresses, and pressures. The effects of the helical or spiral blood flow observed in arterial vessels are of particular interest for biodegradable polymer cardiovascular stents due to its promising biomedical uses and relatively recent discovery. In this study, a novel 3D printed prototype flow device was designed and developed to simulate in-vivo conditions including flow rates, flow characteristics, pressures, temperatures, and chemical environment. The in-vitro biodegradation behavior of poly(εcaprolactone) (PCL), in phosphate buffer solution (PBS) was used to study the influence of flow conditions compared to a standard static ASTM method over 5 weeks. Characterization of the polymer degradation was performed by evaluating changes in weight loss, molecular weight and the degree of crystallinity as a function of time. The number average molecular weight of the polymer showed the largest decline, decreasing linearly with time by 22% and 5% for the samples tested using the flow device and ASTM method, respectively. Similarly, the degree of crystallinity was found to increase linearly by 16% and 6% for the flow device and ASTM method, respectively. Helical/spiral flow at the flow rates as low as 1 cm 3 s −1 were found to enhance the bulk degradation of PCL by up to 80% when compared to the static ASTM method. A combination of bulk and surface erosion mechanisms were proposed for the degradation behavior of the PCL in the flow prototype. This indicates that by more accurately mimicking physiological conditions, including blood dynamics, this 3D printed prototype can serve as an improved method for testing bioabsorbable and biodegradable polymers for implanted devices.

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Biodegradable Inorganic Nanocomposites for Industrial Applications

Ahmed

Hashem²

2022

Handbook of Biodegradable Materials

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Gold nanorods or nanospheres? Role of particle shape on tuning the shape memory effect of semicrystalline poly(ε-caprolactone) networks

Cited by 9 publications

References 43 publications

Mechanistic Investigations of Growth of Anisotropic Nanostructures in Reverse Micelles

Mechanistic Investigations of Growth of Anisotropic Nanostructures in Reverse Micelles

In-vitro biodegradation study of poly( ε -caprolactone) films using a 3D printed helical flow prototype to simulate the physiological conditions for cardiovascular implanted devices

Biodegradable Inorganic Nanocomposites for Industrial Applications

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