4 research outputs found
Bioinspired Modification of h‑BN for High Thermal Conductive Composite Films with Aligned Structure
With the development of microelectronic
technology, the demand of insulating electronic encapsulation materials
with high thermal conductivity is ever growing and much attractive.
Surface modification of chemical inert h-BN is yet a distressing issue
which hinders its applications in thermal conductive composites. Here,
dopamine chemistry has been used to achieve the facile surface modification
of h-BN microplatelets by forming a polydopamine (PDA) shell on its
surface. The successful and effective preparation of h-BN@PDA microplatelets
has been confirmed by SEM, EDS, TEM, Raman spectroscopy, and TGA investigations.
The PDA coating increases the dispersibility of the filler and enhances
its interaction with PVA matrix as well. Based on the combination
of surface modification and doctor blading, composite films with aligned
h-BN@PDA are fabricated. The oriented fillers result in much higher
in-plane thermal conductivities than the films with disordered structures
produced by casting or using the pristine h-BN. The thermal conductivity
is as high as 5.4 W m<sup>–1</sup> K<sup>–1</sup> at
10 vol % h-BN@PDA loading. The procedure is eco-friendly, easy handling,
and suitable for the practical application in large scale
Supplementary document for Loss-tolerant and quantum-enhanced interferometer by reversed squeezing processes - 6497504.pdf
experimental details and theoretical analysi
Fabrication of Conductive Silver Microtubes Using Natural Catkin as a Template
Catkin, a natural
hollow fiber, is used as a template to fabricate
light, flexible, and electrically conductive silver microtubes with
a high aspect ratio. The template is functionalized with tannic acid
(TA)–Fe coordination complexes. Because of the metal ion chelating
ability and reducibility of TA, silver nanoparticles (Ag NPs) can
be formed in situ on the fiber’s surface. The as-formed Ag
NPs can act as nucleation sites in subsequent electroless silver plating,
leading to the formation of a compact and uniform silver coating on
the microtube. The coating is constructed by densely packed Ag NPs
of only 15 ± 5 nm in diameter. Because of the tight accumulation
and small size of the Ag NPs, the resulting silver-coated microtubes,
without any post-treatment, show an electrical resistivity of 1500
mΩ·cm at a bulk density of 0.6 g·cm<sup>–3</sup>. We find that the in situ formed nucleation sites and the stirring
speed in the electroless plating play important roles in the formation
of a silver coating with a high electrical conductivity. This method
may be extended to fabricate conductive nanocoatings on other substrates
Diversified Nanoparticle Assembly Pathways: Materials Architecture Control Beyond the Amphiphilicity Paradigm
The functional versatility of a chemical system is ultimately dictated by the availability of distinctly accessible architectures. The generation of a diverse array of assembled constructs from a single type of nanoscale building block is a promising yet largely elusive goal. We report herein the utility of a monolayer-modified nanoparticle for the creation of a broad range of architectures. The versatile modes of assembly complement the conventionally used, amphiphilicity-driven strategy. We demonstrate that one can vary the nanoparticle assembly pathways within the confines of solvent media through the modulation of interactions and partitioning of nanoparticles. Merging of the molecular-scale design and higher-ordered arrangement enables diversified assembly through the manipulation of experimental parameters such as solvent, pH, affinity molecule, and temperature. Microfluidics provides an effective channel to control the monodispersity and size on all the architectures attainable in the bulk solution phase. These observations could be further explored for an understanding of diversified matter organization and order generation beyond the amphiphilicity paradigm