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X Zhang, Z Shen, J Liu, S N Kerisit, M E Bowden, M L Sushko, J J De Yoreo, K M Rosso
Crystallization by particle attachment is impacting our understanding of natural mineralization processes and holds promise for novel materials design. When particles assemble in crystallographic alignment, expulsion of the intervening solvent and particle coalescence are enabled by near-perfect co-alignment via interparticle forces that remain poorly quantified. Here we report measurement and simulation of these nanoscale aligning forces for the ZnO(0001)-ZnO(000[Formula: see text]) system in aqueous solution...
October 10, 2017: Nature Communications
Qin Yue, Jialuo Li, Yu Zhang, Xiaowei Cheng, Xiao Chen, Panpan Pan, Jiacan Su, Ahmed A Elzatahry, Abdulaziz Alghamdi, Yonghui Deng, Dongyuan Zhao
Yolk-shell nanomaterials with a rattle-like structure have been considered ideal carriers and nanoreactors. Traditional methods to constructing yolk-shell nanostructures mainly rely on multi-step sacrificial template strategy. In this study, a facile and effective plasmolysis-inspired nanoengineering strategy is developed to controllably fabricate yolk-shell magnetic mesoporous silica microspheres via the swelling-shrinkage of resorcinol-formaldehyde (RF) upon soaking in or removal of n-hexane. Using Fe3O4@RF microspheres as seeds, surfactant-silica mesostructured composite is deposited on the swelled seeds through the multicomponent interface co-assembly, followed by solvent extraction to remove surfactant and simultaneously induce shrinkage of RF shell...
October 10, 2017: Journal of the American Chemical Society
Charles W Peak, Jean Stein, Karli A Gold, Akhilesh K Gaharwar
Nanoengineered hydrogels offer the potential to design shear-thinning bioinks for three-dimensional (3D) bioprinting. Here, we have synthesized colloidal bioinks composed of disk-shaped two-dimensional (2D) nanosilicates (Laponite) and poly(ethylene glycol) (PEG). The addition of Laponite reinforces the PEG network and increases viscosity, storage modulus and network stability. PEG-Laponite hydrogels display shear-thinning and self-recovery characteristics due to rapid internal phase rearrangement. As a result, a range of complex pattern can be printed using PEG-Laponite bioinks...
October 5, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Nima A Jalili, Manish K Jaiswal, Charles W Peak, Lauren M Cross, Akhilesh K Gaharwar
"Smart" hydrogels are an emerging class of biomaterials that respond to external stimuli and have been investigated for a range of biomedical applications, including therapeutic delivery and regenerative engineering. Stimuli-responsive nanogels constructed of thermoresponsive polymers such as poly(N-isopropylacrylamide-co-acrylamide) (poly(NIPAM-co-AM)) and magnetic nanoparticles (MNPs) have been developed as "smart carriers" for on-demand delivery of therapeutic biomolecules via magneto-thermal activation...
October 4, 2017: Nanoscale
Leilei Xu, Fangzhi Mou, Haotian Gong, Ming Luo, Jianguo Guan
Light, as an external stimulus, is capable of driving the motion of micro/nanomotors (MNMs) with the advantages of reversible, wireless and remote manoeuvre on demand with excellent spatial and temporal resolution. This review focuses on the state-of-the-art light-driven MNMs, which are able to move in liquids or on a substrate surface by converting light energy into mechanical work. The general design strategies for constructing asymmetric fields around light-driven MNMs to propel themselves are introduced as well as the photoactive materials for light-driven MNMs, including photocatalytic materials, photothermal materials and photochromic materials...
September 26, 2017: Chemical Society Reviews
Ekaterina Y Chernikova, Daria V Berdnikova, Yuri V Fedorov, Olga A Fedorova, François Maurel, Gediminas Jonusauskas
The combination of photoactive styryl(pyridinium) dyes and cucurbit[7]uril (CB[7]) in an integrated supramolecular system allowed us to design a novel high speed molecular machine based on the fully reversible shuttling motion of the dye inside the CB[7] host cavity. The driving force of this movement is the electrostatic potential change after the occurrence of intramolecular charge transfer in the excited state of the dye molecule that can be externally controlled by light. Steady-state and time-resolved optical spectroscopy as well as DFT calculations provided an unambiguous evidence for the ultrafast piston-like movement of the system between two states...
October 4, 2017: Physical Chemistry Chemical Physics: PCCP
Manish K Jaiswal, James K Carrow, James L Gentry, Jagriti Gupta, Nara Altangerel, Marlan Scully, Akhilesh K Gaharwar
A new approach of vacancy-driven gelation to obtain chemically crosslinked hydrogels from defect-rich 2D molybdenum disulfide (MoS2 ) nanoassemblies and polymeric binder is reported. This approach utilizes the planar and edge atomic defects available on the surface of the 2D MoS2 nanoassemblies to form mechanically resilient and elastomeric nanocomposite hydrogels. The atomic defects present on the lattice plane of 2D MoS2 nanoassemblies are due to atomic vacancies and can act as an active center for vacancy-driven gelation with a thiol-activated terminal such as four-arm poly(ethylene glycol)-thiol (PEG-SH) via chemisorption...
September 2017: Advanced Materials
G R Berdiyorov, M V Milošević, A D Hernández-Nieves, F M Peeters, D Domínguez
The magnetic flux domains in the intermediate state of type-I superconductors are known to resemble fluid droplets, and their dynamics in applied electric current is often cartooned as a "dripping faucet". Here we show, using the time-depended Ginzburg-Landau simulations, that microfluidic principles hold also for the determination of the size of the magnetic flux-droplet as a function of the applied current, as well as for the merger or splitting of those droplets in the presence of the nanoengineered obstacles for droplet motion...
September 21, 2017: Scientific Reports
Ismael D Bianco, Marcelo R Ceballos, Cristian Casado, Viviana G Dabbene, Carolina Rizzi, R Kiyomi Mizutamari
Cancer is becoming a leading cause of death in the last years. Although we have seen great advances, most human cancers remain incurable because many patients either do not respond or relapse to treatment. Several lines of research are disclosing new therapeutic targets which lead to new active drugs. However, there are still unsolved problems related to stabilization of the pharmaceutical ingredient in aqueous and biological media, pharmacokinetic and pharmacodynamic profiles and cellular uptake to name just a few...
June 7, 2017: Current Pharmaceutical Design
Shuaidi Zhang, Ren Geryak, Jeffrey Geldmeier, Sunghan Kim, Vladimir V Tsukruk
The robust, sensitive, and selective detection of targeted biomolecules in their native environment by prospective nanostructures holds much promise for real-time, accurate, and high throughput biosensing. However, in order to be competitive, current biosensor nanotechnologies need significant improvements, especially in specificity, integration, throughput rate, and long-term stability in complex bioenvironments. Advancing biosensing nanotechnologies in chemically "noisy" bioenvironments require careful engineering of nanoscale components that are highly sensitive, biorecognition ligands that are capable of exquisite selective binding, and seamless integration at a level current devices have yet to achieve...
September 13, 2017: Chemical Reviews
Zachary Abraham, Emma Hawley, Daniel Hayosh, Victoria Webster-Wood, Ozan Akkus
Motor proteins play critical roles in the normal function of cells and proper development of organisms. Among motor proteins, failings in the normal function of two types of proteins, kinesin and dynein, have been shown to lead many pathologies, including neurodegenerative diseases and cancers. As such, it is critical for researchers to understand the underlying mechanics and behaviors of these proteins, not only to shed light on how failures may lead to disease, but also to guide research towards novel treatment and nanoengineering solutions...
September 13, 2017: Journal of Biomechanical Engineering
Tatiana K Kormilina, Sergei A Cherevkov, Anatoly V Fedorov, Alexander V Baranov
The current direction in the evolution of 2D semiconductor nanocrystals involves the combination of metal and semiconductor components to form new nanoengineered materials called nano-heteroplatelets. This Review covers different heterostructure architectures that can be applied to cadmium chalcogenide nanoplatelets, including variously shaped shell, metal nanoparticle decoration, and doped and alloy systems. Here, for the first time a complete classification of nano-heteroplatelet types is provided with recommended notations and a systematization of the existing knowledge and experience concerning heterostructure formation techniques, addressing the morphology, optoelectronic and magnetic properties, and novel features of different heterostructures...
September 12, 2017: Small
Nawab Singh, Md Azahar Ali, Prabhakar Rai, Ashutosh Sharma, B D Malhotra, Renu John
This paper demonstrates an ultrasensitive microfluidic biochip nanoengineered with microporous manganese-reduced graphene oxide nanocomposite for detection of cardiac biomarker, namely human cardiac troponin I. In this device, the troponin sensitive microfluidic electrode consisted of a thin layer of manganese-reduced graphene oxide (Mn3O4-RGO) nanocomposite material. This nanocomposite thin layer was formed on surface of a patterned indium tin oxide substrate after modification with 3-aminopropyletriethoxysilane and was assembled with a polydimethylsiloxane-based microfluidic system...
October 4, 2017: ACS Applied Materials & Interfaces
Pablo Purohit, Francisco J Fortes, J Javier Laserna
Current trends in nanoengineering are bringing along new structures of diverse chemical compositions that need to be meticulously defined in order to ensure their correct operation. Few methods can provide the sensitivity required to carry out measurements on individual nano-objects without tedious sample pre-treatment or data analysis. In the present study, we introduce a pathway for the elemental identification of single nanoparticles (NPs) that avoids suspension in liquid media by means of optical trapping and laser-induced plasma spectroscopy...
September 6, 2017: Angewandte Chemie
Ludmila B Boinovich, Evgeny B Modin, Adeliya R Sayfutdinova, Kirill A Emelyanenko, Alexander L Vasiliev, Alexandre M Emelyanenko
Industrial application of metallic materials is hindered by several shortcomings, such as proneness to corrosion, erosion under abrasive loads, damage due to poor cold resistance, or weak resistance to thermal shock stresses, etc. In this study, using the aluminum-magnesium alloy as an example of widely spread metallic materials, we show that a combination of functional nanoengineering and nanosecond laser texturing with the appropriate treatment regimes can be successfully used to transform a metal into a superhydrophobic material with exceptional mechanical and chemical properties...
September 7, 2017: ACS Nano
Hsien-Ting Chiu, Cheng-Kuan Su, Yuh-Chang Sun, Chi-Shiun Chiang, Yu-Fen Huang
Recently, living cells with tumor-homing properties have provided an exciting opportunity to achieve optimal delivery of nanotherapeutic agents. However, premature payload leakage may impair the host cells, often leading to inadequate in vivo investigations or therapeutic efficacy. Therefore, a nanoplatform that provides a high drug-loading capacity and the precise control of drug release is required. In the present study, a robust one-step synthesis of a doxorubicin (DOX)-loaded gold nanorod/albumin core-shell nanoplatform (NR@DOX:SA) was designed for effective macrophage-mediated delivery to demonstrate how nanoparticle-loaded macrophages improve photothermal/chemodrug distribution and retention ability to achieve enhanced antitumor effects...
2017: Theranostics
Qiong Dai, Nadja Bertleff-Zieschang, Julia A Braunger, Mattias Björnmalm, Christina Cortez-Jugo, Frank Caruso
Over the past few decades, nanoengineered particles have gained increasing interest for applications in the biomedical realm, including diagnosis, imaging, and therapy. When functionalized with targeting ligands, these particles have the potential to interact with specific cells and tissues, and accumulate at desired target sites, reducing side effects and improve overall efficacy in applications such as vaccination and drug delivery. However, when targeted particles enter a complex biological environment, the adsorption of biomolecules and the formation of a surface coating (e...
August 15, 2017: Advanced Healthcare Materials
Mathieu Bauchy, Mengyi Wang, Yingtian Yu, Bu Wang, N M Anoop Krishnan, Enrico Masoero, Franz-Joseph Ulm, Roland Pellenq
Upon loading, atomic networks can feature delayed irreversible relaxation. However, the effect of composition and structure on relaxation remains poorly understood. Herein, relying on accelerated molecular dynamics simulations and topological constraint theory, we investigate the relationship between atomic topology and stress-induced structural relaxation, by taking the example of creep deformations in calcium silicate hydrates (C─S─H), the binding phase of concrete. Under constant shear stress, C─S─H is found to feature delayed logarithmic shear deformations...
July 21, 2017: Physical Review Letters
Pankaj Sharma, Qi Zhang, Daniel Sando, Chi Hou Lei, Yunya Liu, Jiangyu Li, Valanoor Nagarajan, Jan Seidel
Ferroelectric domain walls are atomically sharp topological defects that separate regions of uniform polarization. The discovery of electrical conductivity in specific types of walls gave rise to "domain wall nanoelectronics," a technology in which the wall (rather than the domain) stores information. This paradigm shift critically hinges on precise nanoengineering of reconfigurable domain walls. Using specially designed nanofabricated electrodes and scanning probe techniques, we demonstrate a prototype nonvolatile ferroelectric domain wall memory, scalable to below 100 nm, whose binary state is defined by the existence or absence of conductive walls...
June 2017: Science Advances
Ji-Jing Xu, Zhi-Wen Chang, Yan-Bin Yin, Xin-Bo Zhang
The successful development of Li-O2 battery technology depends on resolving the issue of cathode corrosion by the discharge product (Li2O2) and/or by the intermediates (LiO2) generated during cell cycling. As an important step toward this goal, we report for the first time the nanoporous Ni with a nanoengineered AuNi alloy surface directly attached to Ni foam as a new all-metal cathode system. Compared with other noncarbonaceous cathodes, the Li-O2 cell with an all-metal cathode is capable of operation with ultrahigh specific capacity (22,551 mAh g(-1) at a current density of 1...
June 28, 2017: ACS Central Science
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