A review of shape memory alloy research, applications and opportunities

Singular Integral Equations. By N.I. Muskhelishvili. Translated fromthe 2nd Russian edition by J.R.M. Radok. Pp. 447. F1. 28.50. 1953. (Noordhoff, Groningen)

This Review focuses on noncovalent functionalization of graphene and graphene oxide with various species involving biomolecules, polymers, drugs, metals and metal oxide-based nanoparticles, quantum dots, magnetic nanostructures, other carbon allotropes (fullerenes, nanodiamonds, and carbon nanotubes), and graphene analogues (MoS2, WS2). A brief description of π–π interactions, van der Waals forces, ionic interactions, and hydrogen bonding allowing noncovalent modification of graphene and graphene oxide is first given. The main part of this Review is devoted to tailored functionalization for applications in drug delivery, energy materials, solar cells, water splitting, biosensing, bioimaging, environmental, catalytic, photocatalytic, and biomedical technologies. A significant part of this Review explores the possibilities of graphene/graphene oxide-based 3D superstructures and their use in lithium-ion batteries. This Review ends with a look at challenges and future prospects of noncovalently modified graph...

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Noncovalent Functionalization of Graphene and Graphene Oxide for Energy Materials, Biosensing, Catalytic, and Biomedical Applications

Shape-memory polymers and their composites: Stimulus methods and applications

Along with extensive research on the three-dimensional (3D) printing of polymers and metals, 3D printing of ceramics is now the latest trend to come under the spotlight. The ability to fabricate ceramic components of arbitrarily complex shapes has been extremely challenging without 3D printing. This review focuses on the latest advances in the 3D printing of ceramics and presents the historical origins and evolution of each related technique. The main technical aspects, including feedstock properties, process control, post-treatments and energy source–material interactions, are also discussed. The technical challenges and advice about how to address these are presented. Comparisons are made between the techniques to facilitate the selection of the best ones in practical use. In addition, representative applications of the 3D printing of various types of ceramics are surveyed. Future directions are pointed out on the advancement on materials and forming mechanism for the fabrication of high-performance ceramic components.

3D printing of ceramics: A review

In this paper, the Fiber Bragg Grating (FBG) sensors are real time employed to simultaneously monitoring the cure process of CFRP composite laminates with and without damage. Furthermore, the NDE of smart composite laminates embedded FBG sensors are performed by using the 3-point bending test.

Structural NDE of CFRP Composite Materials Using Fiber Bragg Grating Sensors

Formation of Mn+1AXn phases in Ti–Cr–Al–C systems by self-propagating high-temperature synthesis

The triple-shape memory polymer (TSMP) can be programmed into two temporary shapes (S1 and S2) and shows an ordinal recovery from S2 to S1 and eventually to the permanent shape upon heating, which realizes more complex stimulus-response motions. We introduced a novel strategy for forming triple-shape memory cyanate ester (TSMCE) resins with high strength and fracture toughness via three-step curing, including four-dimensional (4D) printing, UV post-curing, and thermal curing. The obtained TSMCE resins presented two separated glass transition temperature (Tg) regions due to the formation of an interpenetrating polymer network (IPN), which successfully endowed the polymers with the triple-shape memory effect. The two Tg increased with the increasing cyanate ester (CE) prepolymer content; their ranges were 82.7-102.1 °C and 164.4-229.0 °C, respectively. The fracture strain of the IPN CE resin was up to 10.9%. Moreover, the cooperation of short carbon fibers (CFs) and glass fibers (GFs) with the polymer-accelerated phase separation resulted in two well-separated Tg peaks exhibiting better excellent triple-shape memory behaviors and fracture toughness. The strategy for combining the IPN structure and 4D printing provides insight into the preparation of shape memory polymers integrating high strength and toughness, multiple-shape memory effect, and multifunctionality.

4D Printing of Triple-Shape Memory Cyanate Composites Based on Interpenetrating Polymer Network Structures.

The crystal structure and polarization switching behavior of SrBi14La06Ta2O9 (SBLT) thin films have been studied by x-ray diffraction and piezoresponse force microscopy (PFM), respectively Compared with SrBi2Ta2O9 (SBT), SBLT thin films show a reduced orthorhombic distortion The polarization rotation of SBLT thin film, which is driven by negative and positive direct current (dc) biases, has been investigated by a combination of vertical and lateral PFM (VPFM and LPFM, respectively) After dc bias applications, the VPFM image is hardly changed, whereas the LPFM image experiences an obvious variation It is believed that such difference is caused by 90° polarization switching However, this kind of switching can be only realized by the exchange of a axis and b axis By virtue of the reduced orthorhombic distortion, the a-b exchange in SBLT is easier than that in SBT Unfortunately, stress is created due to the 90° polarization switching in SBLT thin films The internal stress is found to increase with t

90° switching of polarization in La3+-doped SrBi2Ta2O9 thin films

In this paper, the Acoustic emission (AE) technique is applied to clarify the damage mechanisms of 3-D carbon/epoxy
braided composites with different braiding angles under the compressive loading. The AE responses for the three kinds
of specimens are significantly different due to the different damage mechanisms. The results reveal that the curves of
cumulative AE counts can be used to analyze the damage processes of 3-D braided composites more exactly than that of
only using the load-time curves. Through analyzing both the cumulative AE counts and the load-time curves at the same
time, the damage processes can be divided into different stages and be described in detail. The present paper reveals that
the AE technique is a viable and effective tool for analyzing the fracture process and damage mechanisms in the 3-D
braided composite materials under the compressive testing.

Shanyi Du

Papers

Structural NDE of CFRP Composite Materials Using Fiber Bragg Grating Sensors

Formation of Mn+1AXn phases in Ti–Cr–Al–C systems by self-propagating high-temperature synthesis

4D Printing of Triple-Shape Memory Cyanate Composites Based on Interpenetrating Polymer Network Structures.

90° switching of polarization in La3+-doped SrBi2Ta2O9 thin films

Experimental investigation of compressive damage mechanisms on 3-D braided composites by acoustic emission