22,465 results match your criteria controllable physics

PEG-Induced Controllable Thin-Thickness Gradient and Water Retention: A Simple Way to Programme Deformation of Hydrogel Actuators.

Macromol Rapid Commun 2021 Jun 15:e2000749. Epub 2021 Jun 15.

The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials(MoE), National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), State Key Laboratory of Polymer Materials Engineering, College of Chemistry, Sichuan University, Chengdu, 610064, China.

Building the differential growth through the thickness is a promising and challenging approach to design the morphing structures of hydrogel actuators. Besides retaining the size of the hydrogel actuators under environmental stimuli still remains a big challenge. Herein, a facile and universal approach is developed to address both issues by introducing PEG during the polymerization of N-isopropylacrylamide (NIPAm) via one step method using asymmetric mold. Read More

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Ultrafast Water Transport in Two-Dimensional Channels Enabled by Spherical Polyelectrolyte Brushes with Controllable Flexibility.

Angew Chem Int Ed Engl 2021 Jun 14. Epub 2021 Jun 14.

East China University of Science and Technology, School of Chemical Engineering, CHINA.

Fast water transport channels are crucial for water-related membrane separation processes. However, overcoming the trade-off between flux and selectivity is still a major challenge. To address this, we constructed spherical polyelectrolyte brush (SPB) structures with a highly hydrophilic polyelectrolyte brush layer, and introduced them into GO laminates, which increased both the flux and the separation factor. Read More

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Ultrahigh energy-dissipation elastomers by precisely tailoring the relaxation of confined polymer fluids.

Nat Commun 2021 Jun 14;12(1):3610. Epub 2021 Jun 14.

Key Laboratory of Bioinspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry, Beihang University, Beijing, P. R. China.

Energy-dissipation elastomers relying on their viscoelastic behavior of chain segments in the glass transition region can effectively suppress vibrations and noises in various fields, yet the operating frequency of those elastomers is difficult to control precisely and its range is narrow. Here, we report a synergistic strategy for constructing polymer-fluid-gels that provide controllable ultrahigh energy dissipation over a broad frequency range, which is difficult by traditional means. This is realized by precisely tailoring the relaxation of confined polymer fluids in the elastic networks. Read More

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Interplay between intrinsically disordered proteins inside membraneless protein liquid droplets.

Chem Sci 2019 Dec 11;11(5):1269-1275. Epub 2019 Dec 11.

Department of Chemistry, KAIST 291 Daehak-ro, Yuseong-gu Daejeon 34143 Republic of Korea +82-42-350-2810 +82-42-350-2817.

Intrinsically disordered proteins (IDPs) in cells phase separate to form diverse membraneless organelles, which have condensed liquid droplet-like properties and often contain multiple IDPs. However, how potential interactions between different IDPs affect the dynamic behavior of these protein droplets is largely unknown. Here, we develop a rapid IDP clustering system to generate protein droplets with varied residue compositions and examine diverse interacting IDPs inside droplets. Read More

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December 2019

Preliminary examination of the potential of robot-assisted sonography - An ergonomic tool for obstetric sonographers.

Appl Ergon 2021 Jun 11;96:103479. Epub 2021 Jun 11.

Department of Health Science and Technology, Aalborg University, Aalborg, Denmark. Electronic address:

The aim of this study was to explore the ergonomic challenges, the needs and reservations related to robot-assisted ultrasound for obstetric sonographers and thereby to provide information for the design of robotic solutions. A mixed-method design was used, where data from the obstetric sonographers and their immediate managers from 18 out of a Danish total of 20 obstetric departments was collected. The data was collected through a survey and interviews. Read More

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Tuneable Hybrid Hydrogels via Complementary Self-Assembly of a Bioactive Peptide with a Robust Polysaccharide.

ACS Biomater Sci Eng 2021 Jun 14. Epub 2021 Jun 14.

Biofab3D, Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Fitzroy, VIC 3065, Australia.

Synthetic materials designed for improved biomimicry of the extracellular matrix must contain fibrous, bioactive, and mechanical cues. Self-assembly of low molecular weight gelator (LMWG) peptides Fmoc-DIKVAV (Fmoc-aspartic acid-isoleucine-lysine-valine-alanine-valine) and Fmoc-FRGDF (Fmoc-phenylalanine-arginine-glycine-aspartic acid-phenylalanine) creates fibrous and bioactive hydrogels. Polysaccharides such as agarose are biocompatible, degradable, and non-toxic. Read More

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Artificial Light-Harvesting Systems Based on AIEgen-branched Rotaxane Dendrimers for Efficient Photocatalysis.

Angew Chem Int Ed Engl 2021 Jun 14. Epub 2021 Jun 14.

East China Normal University, Department of Chemistry, CHINA.

Aiming at the construction of novel platform for efficient light harvesting, the precise synthesis of a new family of AIEgen-branched rotaxane dendrimers was successful realized from an AIEgen-functionalized [2]rotaxane through a controllable divergent approach. In the resultant AIE macromolecules, up to twenty-one AIEgens located at the tails of each branches, thus making them the first successful example of AIEgen-branched dendrimers. Attributed to the solvent-induced switching feature of the rotaxane branches, the integrated rotaxane dendrimers displayed interesting dynamic feature upon the aggregation-induced emission (AIE) process. Read More

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Applications of 3D bioprinting in tissue engineering: advantages, deficiencies, improvements, and future perspectives.

J Mater Chem B 2021 Jun 14. Epub 2021 Jun 14.

Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing 100083, China.

Over the past decade, 3D bioprinting technology has progressed tremendously in the field of tissue engineering in its ability to fabricate individualized biological constructs with precise geometric designability, which offers us the capability to bridge the divergence between engineered tissue constructs and natural tissues. In this work, we first review the current widely used 3D bioprinting approaches, cells, and materials. Next, the updated applications of this technique in tissue engineering, including bone tissue, cartilage tissue, vascular grafts, skin, neural tissue, heart tissue, liver tissue and lung tissue, are briefly introduced. Read More

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Effects of Strain and Electric Field on Molecular Doping in MoSSe.

ACS Omega 2021 Jun 25;6(22):14639-14647. Epub 2021 May 25.

College of Physics and Communication Electronics, Laboratory of Computational Material Physics, Jiangxi Normal University, Nanchang 330022, China.

Recently, synthesized Janus MoSSe monolayers have attracted tremendous attention in science and technology due to their novel properties and promising applications. In this work, we investigate their molecular adsorption-induced structural and electronic properties and tunable doping effects under biaxial strain and external electric field by first-principles calculations. We find an effective n-type or p-type doping in the MoSSe monolayer caused by noncovalent tetrathiafulvalene (TTF) or tetracyanoquinodimethane (TCNQ) molecular adsorption. Read More

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The Controlled Synthesis of Birnessite Nanoflowers HO Reducing KMnO For Efficient Adsorption and Photooxidation Activity.

Front Chem 2021 26;9:699513. Epub 2021 May 26.

Key Laboratory of Poyang Lake Watershed Agricultural Resources and Ecology of Jiangxi Province, College of Land Resources and Environment, Jiangxi Agricultural University, Nanchang, China.

Birnessite nanoflowers composed of layers have been proven to be the strongest adsorbent and oxidant in the surface environment. However, the current synthesis methods of birnessite nanoflowers are suffering from long reaction time and high reaction temperature. Based on these, this paper explores a new method for the rapid and controlled synthesis of layered manganese oxides. Read More

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Simultaneously achieving high capacity storage and multilevel anti-counterfeiting using electrochromic and electrofluorochromic dual-functional AIE polymers.

Chem Sci 2021 Apr 12;12(20):7058-7065. Epub 2021 Apr 12.

State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates, AIE Institute, Center for Aggregation-Induced Emission, South China University of Technology Guangzhou 510640 China

With the advent of the big data era, information storage and security are becoming increasingly important. However, high capacity information storage and multilevel anti-counterfeiting are typically difficult to achieve simultaneously. To address this challenge, herein, two electrochromic and electrofluorochromic dual-functional polymers with aggregation-induced emission (AIE) characteristics were rationally designed and facilely prepared. Read More

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Extremely low-frequency phonon material and its temperature- and photo-induced switching effects.

Chem Sci 2020 Aug 17;11(33):8989-8998. Epub 2020 Aug 17.

Department of Chemistry, School of Science, The University of Tokyo 7-3-1 Hongo, Bunkyo-ku Tokyo 113-0033 Japan

Atomic vibrations due to stretching or bending modes cause optical phonon modes in the solid phase. These optical phonon modes typically lie in the frequency range of 10 to 10 cm. How much can the frequency of optical phonon modes be lowered? Herein we show an extremely low-frequency optical phonon mode of 19 cm (0. Read More

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The Application Potential and Advance of Mesenchymal Stem Cell-Derived Exosomes in Myocardial Infarction.

Stem Cells Int 2021 1;2021:5579904. Epub 2021 Jun 1.

Cell Therapy Laboratory, The First Hospital of Hebei Medical University, Shijiazhuang, China.

Myocardial infarction (MI) is a devastating disease with high morbidity and mortality caused by the irreversible loss of functional cardiomyocytes and heart failure (HF) due to the restricted blood supply. Mesenchymal stem cells (MSCs) have been emerging as lead candidates to treat MI and subsequent HF mainly through secreting multitudinous factors of which exosomes act as the most effective constituent to boost the repair of heart function through carrying noncoding RNAs and proteins. Given the advantages of higher stability in the circulation, lower toxicity, and controllable transplantation dosage, exosomes have been described as a wonderful and promising cell-free treatment method in cardiovascular disease. Read More

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Reducing Objectification Could Tackle Stigma in the COVID-19 Pandemic: Evidence From China.

Front Psychol 2021 28;12:664422. Epub 2021 May 28.

School of Public Health and Management, Wenzhou Medical University, Wenzhou, China.

Stigmatization associated with the coronavirus disease 2019 (COVID-19) is expected to be a complex issue and to extend into the later phases of the pandemic, which impairs social cohesion and relevant individuals' well-being. Identifying contributing factors and learning their roles in the stigmatization process may help tackle the problem. This study quantitatively assessed the severity of stigmatization against three different groups of people: people from major COVID-19 outbreak sites, those who had been quarantined, and healthcare workers; explored the factors associated with stigmatization within the frameworks of self-categorization theory and core social motives; and proposed solutions to resolve stigma. Read More

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Dosimetric impact of dwell time deviation constraint on inverse brachytherapy treatment planning and comparison with conventional optimization method for interstitial brachytherapy implants.

J Cancer Res Ther 2021 Apr-Jun;17(2):463-470

Department of Radiotherapy, Lok Nayak Hospital, Delhi, India.

Purpose: High-dose rate remote afterloading brachytherapy machine and advanced treatment planning system help in getting optimum dose to tumor and low dose to normal structures. Inverse planning simulated annealing (IPSA) optimization technique has a unique feature of dwell time deviation constraint (DTDC). In this study, six IPSA-based plans having different DTDC values with routinely practiced geometric plus graphical optimization (GO + GrO) have been compared using various dosimetric parameters. Read More

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Genetically modified cell sheets in regenerative medicine and tissue engineering.

Biomaterials 2021 May 24;275:120908. Epub 2021 May 24.

The Affiliated Hospital of Stomatology, School of Stomatology, Zhejiang University School of Medicine, Key Laboratory of Oral Biomedical Research of Zhejiang Province, Hangzhou, Zhejiang, 310006, China. Electronic address:

Genetically modified cell sheet technology is emerging as a promising biomedical tool to deliver therapeutic genes for regenerative medicine and tissue engineering. Virus-based gene transfection and non-viral gene transfection have been used to fabricate genetically modified cell sheets. Preclinical and clinical studies have shown various beneficial effects of genetically modified cell sheets in the regeneration of bone, periodontal tissue, cartilage and nerves, as well as the amelioration of dental implant osseointegration, myocardial infarction, skeletal muscle ischemia and kidney injury. Read More

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Citrate iron complex induced dramatically enhanced oxidation of atrazine with bimetallic Bi/Fe: Reactivity, oxidation and mechanism.

Chemosphere 2021 Jun 4;282:131100. Epub 2021 Jun 4.

School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China. Electronic address:

The oxidative degradation of atrazine (ATR) using bimetallic Bi/Fe nanoparticles cooperated with citric acid (CA) and sodium citrate (NaCA) without extra addition of HO or another oxidant was conducted. Almost 73% of ATR was removed in Bi/Fe+NaCA + CA buffer system in 3 h, and the bimetallic Bi/Fe performs high stability and long service life in the buffer system according to the results of cyclic degradation experiments. The citrate iron complex of Fe(II)[Cit] played the key role for the degradation process since it could quickly react with the generated HO to produce free radicals in the Bi/Fe+NaCA + CA system, which broadened the applicable pH range of the traditional Fenton reaction and promoted the oxidative degradation process of ATR. Read More

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Antimicrobial nanofibrous mats with controllable drug release produced from hydrophobized hyaluronan.

Carbohydr Polym 2021 Sep 19;267:118225. Epub 2021 May 19.

CONTIPRO a.s., Dolní Dobrouč 401, 561 02, Czech Republic. Electronic address:

Due to their large active surface, high loading efficiency, and tunable dissolution profiles, nanofibrous mats are often cited as promising drug carriers or antimicrobial membranes. Hyaluronic acid has outstanding biocompatibility, but it is hydrophilic. Nanofibrous structures made from hyaluronan dissolve immediately, making them unsuitable for controlled drug release and longer applications. Read More

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September 2021

Fabrication and applications of bioactive chitosan-based organic-inorganic hybrid materials: A review.

Carbohydr Polym 2021 Sep 8;267:118179. Epub 2021 May 8.

MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China. Electronic address:

Organic-inorganic hybrid materials like bone, shells, and teeth can be found in nature, which are usually composed of biomacromolecules and nanoscale inorganic ingredients. Synergy of organic-inorganic components in hybrid materials render them outstanding and versatile performance. Chitosan is commonly used organic materials in bionic hybrid materials since its bioactive properties and could be controllable tailored by various means to meet complex conditions in different applications. Read More

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September 2021

Dynamic control of Purcell enhanced emission of erbium ions in nanoparticles.

Nat Commun 2021 Jun 11;12(1):3570. Epub 2021 Jun 11.

ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, Barcelona, Spain.

The interaction of single quantum emitters with an optical cavity enables the realization of efficient spin-photon interfaces, an essential resource for quantum networks. The dynamical control of the spontaneous emission rate of quantum emitters in cavities has important implications in quantum technologies, e.g. Read More

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MOF-enzyme hybrid nanosystem decorated 3D hollow fiber membranes for in-situ blood separation and biosensing array.

Biosens Bioelectron 2021 Jun 5;190:113413. Epub 2021 Jun 5.

MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou, 310027, China. Electronic address:

Modified metal-organic frameworks (MOFs) doping with enzymes exhibit high enzyme stability and catalytic performance, which is a research hotspot in the field of enzyme-based sensing. Although the MOF-enzyme constitutes a 3D structure in the nanoscale, the macroscopic assembly configuration still stays in 1D or 2D structures, limiting sensing applications towards complex biological targets. Herein, the MOF-enzyme hybrid nanosystem was assembled into 3D porous conductive supports via a controllable physical embedding method, displaying high enzymatic loading, stability and cascade catalytic performance. Read More

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Efficient integration of IoT-based micro storages to improve urban drainage performance through advanced control strategies.

Water Sci Technol 2021 Jun;83(11):2678-2690

Unit of Environmental Engineering, Department of Infrastructure Engineering, Faculty of Engineering Sciences, University of Innsbruck, Technikerstrasse 13, 6020 Innsbruck, Austria E-mail:

The smart rain barrel (SRB) consists of a conventional RB with storage volumes between 200 and 500 L, which is extended by a remotely (and centrally) controllable discharge valve. The SRB is capable of releasing stormwater prior to precipitation events by using high-resolution weather forecasts to increase detention capacity. However, as shown in a previous work, a large-scale implementation combined with a simultaneous opening of discharge valves clearly reduced the effectiveness. Read More

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Liquid-Phase Exfoliated Few-Layer Iodine Nanosheets for High-Rate Lithium-Iodine Batteries.

Chempluschem 2021 Jun;86(6):865-869

College of Applied Science and Technology, Beijing Union University, Beijing, 100012, P. R. China.

Rechargeable lithium-iodine (Li-iodine) batteries attract significant attention owning to their high energy density, wide abundance and low cost of iodine resources. However, iodine suffers from low electrical conductivity and high solubility in aprotic electrolyte, leading to fast capacity degradation, low columbic efficiency, as well as poor rate capability. Herein, we propose a simple method for the large-scale production of two-dimensional (2D) few-layer iodine nanosheets (FLINs) via liquid-phase exfoliation of iodine in deionized water. Read More

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Catalyst- and Solvent-Free Synthesis of Chemically Stable Aza-Bridged Bis(phenanthroline) Macrocycle-Linked Covalent Organic Framework.

Angew Chem Int Ed Engl 2021 Jun 11. Epub 2021 Jun 11.

Ulsan National Institute of Science and Technology UNIST, School of Energy and Chemical Engineering/Center for Dimension-Controllable Orga, 100, Banyeon, 689-798, Ulsan, KOREA, REPUBLIC OF.

Developing new linkage-based covalent organic frameworks (COFs) is one of the major topics in reticular chemistry. Electrically conductive COFs have enabled applications in energy storage and electrochemical catalysis, which are not feasible using insulating COFs. Despite significant advances, the construction of chemically stable conductive COFs by the formation of new linkages remains relatively unexplored and challenging. Read More

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Facile, scalable, and adaptive infrared reflection towards soft systems by blowing a Janus rubber film.

iScience 2021 May 16;24(5):102430. Epub 2021 Apr 16.

State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, Hubei, P. R. China.

Controllable IR-reflection systems can be applied to displays, adaptive military camouflages, thermal managements, and many other fields. However, current reported controllable IR-reflection systems suffer from utilizing rigid materials, complicated devices, or high working temperature/voltage, which are not suitable for their widespread applications toward soft systems. Herein, inspired by cephalopods, we demonstrate a facile and scalable method for adaptive IR reflection based on a Janus rubber film, which is composed of aluminum-coated microsheets (AMSs)/rubber composite top and a rubber only bottom. Read More

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Natural Biomaterials as Instructive Engineered Microenvironments That Direct Cellular Function in Peripheral Nerve Tissue Engineering.

Front Bioeng Biotechnol 2021 25;9:674473. Epub 2021 May 25.

UCL Centre for Nerve Engineering, University College London, London, United Kingdom.

Nerve tissue function and regeneration depend on precise and well-synchronised spatial and temporal control of biological, physical, and chemotactic cues, which are provided by cellular components and the surrounding extracellular matrix. Therefore, natural biomaterials currently used in peripheral nerve tissue engineering are selected on the basis that they can act as instructive extracellular microenvironments. Despite emerging knowledge regarding cell-matrix interactions, the exact mechanisms through which these biomaterials alter the behaviour of the host and implanted cells, including neurons, Schwann cells and immune cells, remain largely unclear. Read More

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Large scale self-assembly of plasmonic nanoparticles on deformed graphene templates.

Sci Rep 2021 Jun 10;11(1):12232. Epub 2021 Jun 10.

Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL, USA.

Hierarchical heterostructures of two-dimensional (2D) nanomaterials are versatile platforms for nanoscale optoelectronics. Further coupling of these 2D materials with plasmonic nanostructures, especially in non-close-packed morphologies, imparts new metastructural properties such as increased photosensitivity as well as spectral selectivity and range. However, the integration of plasmonic nanoparticles with 2D materials has largely been limited to lithographic patterning and/or undefined deposition of metallic structures. Read More

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Development of new strategy combining heat treatment and phage cocktail for post-contamination prevention.

Food Res Int 2021 Jul 18;145:110415. Epub 2021 May 18.

Department of Food and Animal Biotechnology, Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Republic of Korea; Department of Agricultural Biotechnology, College of Agriculture and Life Science, Seoul National University, Seoul 08826, Republic of Korea; Center for Food Bioconvergence, Seoul National University, Seoul 08826, Republic of Korea. Electronic address:

Heat treatment is an effective method for ensuring food safety and quality by controlling microbial contamination. However, food poisoning outbreaks have continuously occurred in heat-treated products due to improper thermal treatment and/or post-contamination of foodborne pathogens. This study proposes a novel strategy combining thermostable bacteriophages with thermal processing of food production plants to control foodborne pathogens and even bacterial contamination. Read More

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Anisotropically Functionalized Aptamer-DNA Nanostructures for Enhanced Cell Proliferation and Target-Specific Adhesion in 3D Cell Cultures.

Biomacromolecules 2021 Jun 10. Epub 2021 Jun 10.

Department of Biotechnology, College of Life Science and Biotechnology, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea.

The development of supramolecular hydrogel scaffolds for the precise positioning of biochemical cues is paramount for applications such as tissue engineering. Nucleic acid engineering allows fabrication of three-dimensional (3D) nanostructures with high variability and nanoscale precision. In this study, aptamers were anisotropically functionalized onto branched DNA nanostructures to control their cell adhesion capability, and their efficiency as biological signal inducers for 3D cell cultivation was investigated. Read More

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Facile synthesis of porous MoS2 nanofibers for efficient drug delivery and cancer treatment.

Shaobo Liu Yan Wang

Nanotechnology 2021 Jun 10. Epub 2021 Jun 10.

Basic Medicine, Henan University, Leonardo, Kaifeng, Henan, 475001, CHINA.

Porous MoS2 nanofibers were synthesized by electroplating and post-annealing and applied in a responsive drug delivery system. The one-dimensional (1D) MoS2 nanofibers displayed a high specific surface area, controllable morphology, and uniform size, serving as a promising drug carrier for chemotherapy. After surface modification with polyethylene glycol (PEG) through PEGylation, the MoS2/PEG composite displayed excellent physical/chemical stability and biocompatibility. Read More

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