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MXenes for Bioinspired Soft Actuators:Advancements in Angle-Independent Structural Colors and Beyond

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Nano-Micro Letters 2024年第8期16卷 18-34页

作者： Siavash Iravani rajender S.varma Independent researcher W Nazar STBoostan AveIsfahanIran Centre of Excellence for research in Sustainable Chemistry Department of ChemistryFederal University of São CarlosSão CarlosSP 13565‑905Brazil

Soft actuators have garnered substantial attention in current years in view of their potential appliances in diverse domains like robotics,biomedical devices,and biomimetic *** actuators mimic the natural movements of living organisms,aiming to attain enhanced flexibility,adaptability,and *** the other hand,angle-independent structural color has been achieved through innovative design strategies and engineering *** carefully controlling the size,shape,and arrangement of nanostructures,researchers have been able to create materials exhibiting consistent colors regardless of the viewing *** promising class of materials that holds great potential for bioinspired soft actuators is MXenes in view of their exceptional mechanical,electrical,and optical *** integration of MXenes for bioinspired soft actuators with angle-independent structural color offers exciting *** material compatibility issues,improving color reproducibility,scalability,durability,power supply efficiency,and cost-effectiveness will play vital roles in advancing these *** perspective appraises the development of bioinspired MXene-centered soft actuators with angleindependent structural color in soft robotics.

关键词： MXenes MXene-based composites Bioinspired soft robotics Angle-independent structural color

Nano/Micro-Structural Supramolecular Biopolymers: Innovative Networks with the Boundless Potential in Sustainable Agriculture

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Nano-Micro Letters 2024年第8期16卷 79-101页

作者： roohallah Saberi riseh Mohadeseh Hassanisaadi Masoumeh Vatankhah rajender S.varma Vijay Kumar Thakur Department of Plant Protection Faculty of AgricultureVali-e-Asr University of RafsanjanImam Khomeini SquareRafsanjan ***Iran Centre of Excellence for research in Sustainable Chemistry Department of ChemistryFederal University of São CarlosSão CarlosSP 13565‑905Brazil Biorefining and Advanced Materials research Center Scotland’s Rural Collage(SRUC)Edinburgh EH93JGUK

Sustainable agriculture plays a crucial role in meeting the growing global demand for food while minimizing adverse environmental impacts from the overuse of synthetic pesticides and conventional *** this context,renewable biopolymers being more sustainable offer a viable solution to improve agricultural sustainability and ***/micro-structural supramolecular biopolymers are among these innovative biopolymers that are much sought after for their unique *** biomaterials have complex hierarchical structures,great stability,adjustable mechanical strength,stimuli-responsiveness,and self-healing *** molecules may be added to their flexible structure,for enabling novel agricultural *** overview scrutinizes how nano/micro-structural supramolecular biopolymers may radically alter farming practices and solve lingering problems in agricultural sector namely improve agricultural production,soil health,and resource *** bioactive ingredient released from biopolymers allows the tailored administration of agrochemicals,bioactive agents,and biostimulators as they enhance nutrient absorption,moisture retention,and root ***/micro-structural supramolecular biopolymers may protect crops by appending antimicrobials and biosensing entities while their eco-friendliness supports sustainable *** their potential,further studies are warranted to understand and optimize their usage in agricultural *** effort seeks to bridge the knowledge gap by investigating their applications,challenges,and future prospects in the agricultural *** experimental investigations and theoretical modeling,this overview aims to provide valuable insights into the practical implementation and optimization of supramolecular biopolymers in sustainable agriculture,ultimately contributing to the development of innovative and eco-friendly solutions to enhance agricultural productivity while minimizing envir

关键词： Supramolecular Biopolymers Sustainable agriculture Nanotechnology

Water and nutrient recovery from urine:A lead up trail using nano-structured In_(2)S_(3)photo electrodes

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Chinese Physics B 2021年第5期30卷 531-535页

作者： r Jayakrishnan T r Sreerev Adith varma Department of Physics University of KeralaThiruvananthapuramKerala 695581India Photovoltaic research Laboratory Christian College Chenagnnur 689122India

Developments of economic systems are critical for bio-regenerative life support systems in manned space *** this work we report on the feasibility of using two direct sunlight powered processes sequentially for the recovery of water and nutrients from *** work presents experimental evidence on nutrient and water recovery achieved using the proto-type designed and *** report the design and testing of a solar still which would serve on the nutrient recovery *** cooled condensate from the solar still is fed into a solar powered electrolysis unit where nano-structured indium sulphide(In_(2)S_(3))thin films coated over fluorine doped tin oxide(SnO_(2):F)substrate serve as one of the working *** electrolysis takes place in the absence of an electrolyte which manifests as a technical achievement of our *** results show that the COD level in the recycled water is very *** In_(2)S_(3)photo-electrodes are stable without any physical damage after the process.

关键词： semiconductors water quality thin film structure and morphology electrolysis

Ethical frontiers in liver transplantation

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World Journal of Transplantation 2024年第4期14卷 50-60页

作者： Hoi Pong Nicholas Wong Surya varma Selvakumar Pei Yi Loh Jovan Yi Jun Liau Matthias Yi Quan Liau Vishalkumar Girishchandra Shelat Lee Kong Chian School of Medicine Nanyang Technological UniversitySingapore 308232Singapore Department of General Surgery Tan Tock Seng HospitalSingapore 308433Singapore Surgical Science Training Centre Tan Tock Seng HospitalSingapore 308433Singapore

Liver transplantation represents a pivotal intervention in the management of end-stage liver disease,offering a lifeline to countless *** significant strides in surgical techniques and organ procurement,ethical dilemmas and de-bates continue to underscore this life-saving *** the ethical terrain surrounding this complex procedure is hence *** the nuances of ethical principles of justice,autonomy and beneficence that underpin transplant protocols worldwide,we explore the modern challenges that plaques the world of liver *** investigate the ethical dimensions of organ transplantation,focusing on allocation,emerging technologies,and decision-making ***,Scopus,Web of Science,Embase and Central were searched from database inception to February 29,2024 using the following key-words:“liver transplant”,“transplantation”,“liver donation”,“liver recipient”,“organ donation”and“ethics”.Information from relevant articles surrounding ethical discussions in the realm of liver transplantation,especially with regards to organ recipients and allocation,organ donation,transplant tourism,new age technologies and developments,were *** the definition of death to the long term follow up of organ recipients,liver transplantation has many ethical *** new transplant techniques,societal acceptance and perceptions also play a pivotal ***,religious and regional factors including but not limited to beliefs,wealth and accessibility are extremely influential in public at-titudes towards donation,xenotransplantation,stem cell research,and adopting artificial *** and addressing these perspectives whilst upholding bioethical principles is essential to ensure just distribution and fair allocation of *** regulatory oversight for ethical sourcing of organs,ensuring good patient selection and transplant techniques,and high-quality long-term surveillance to mitiga

关键词： “liver transplant” “transplan-tation” “liver donation” “liver recipient” “organ donation”and“ethics”

Effect of nano-and micron-sized K0.5Na0.5NbO3 fillers on the dielectric and piezoelectric properties of PVDF composites

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Journal of Advanced Ceramics 2016年第4期5卷 92-页

作者： Bharathi PONrAJ rajasekhar BHIMIrEDDI K.B.r.varma Materials research Centre Indian Institute of Science Bangalore-560012 India

Polymer nanocrystal composites were fabricated by embedding polyvinylidene fluoride (PVDF) with K0.5Na0.5NbO3 (KNN) nanocrystallites of different volume fraction using the hot-pressing *** comparison,PVDF-KNN microcrystal composites of the same compositions were also fabricated which facilitated the studies of the crystallite size (wide range) effect on the dielectric and piezoelectric *** structural,morphological,dielectric,and piezoelectric properties of these nano and micro crystal composites were *** incorporation of KNN fillers in PVDF at both nanometer and micron scales above 10 vol％ resulted in the formation of polar β-form of *** room temperature dielectric constant as high as 3273 at 100 Hz was obtained for the PVDF comprising 40 vol％ KNN nanocrystallites due to dipole-dipole interactions (as the presence of β-PVDF is prominent),whereas it was only 236 for the PVDF containing the same amount (40 vol％) of micron-sized crystallites of KNN at the same *** theoretical models were employed to predict the dielectric constants of the PVDF-KNN nano and micro crystal *** PVDF comprising 70 vol％ micron-sized crystallites of KNN exhibited a d33 value of 35 pC/N,while the nanocrystal composites of PVDF-KNN did not exhibit any piezoelectric response perhaps due to the unrelieved internal stress within each grain,besides the fact that they have less domain walls.

关键词： polyvinylidene fluoride (PVDF) K0.5Na0.5NbO3 (KNN) composites β-PVDF nanocrystallites

MXene-Based Composites as Nanozymes in Biomedicine: A Perspective

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Nano-Micro Letters 2022年第12期14卷 447-463页

作者： Siavash Iravani rajender S.varma Faculty of Pharmacy and Pharmaceutical Sciences Isfahan University of Medical SciencesIsfahanIran regional Centre of Advanced Technologies and Materials Department of Physical ChemistryFaculty of SciencePalacky University in OlomoucSlechtitelu2778371 OlomoucCzech Republic

MXene-based nanozymes have garnered considerable attention because of their potential environmental and biomedical *** materials encompass alluring and manageable catalytic performances and physicochemical features,which make them suitable as(bio)sensors with high selectivity/sensitivity and ***-based structures with suitable electrical conductivity,biocompatibility,large surface area,optical/magnetic properties,and thermal/mechanical features can be applied in designing innovative nanozymes with area-dependent electrocatalytic *** the advances made,there is still a long way to deploy MXene-based nanozymes,especially in medical and healthcare applications;limitations pertaining the peroxidaselike activity and sensitivity/selectivity may restrict further practical applications of pristine ***,developing an efficient surface engineering tactic is still required to fabricate multifunctional MXene-based nanozymes with excellent *** obtain MXene-based nanozymes with unique physicochemical features and high stability,some crucial steps such as hybridization and modification ought to be ***,(nano)toxicological and long-term biosafety analyses along with clinical translation studies still need to be comprehensively *** very limited reports exist pertaining to the biomedical potentials of MXene-based nanozymes,the future explorations should transition toward the extensive research and detailed analyses to realize additional potentials of these structures in biomedicine with a focus on clinical and industrial *** this perspective,therapeutic,diagnostic,and theranostic applications of MXene-based nanozymes are deliberated with a focus on future per-spectives toward more successful clinical translational *** current state-of-the-art biomedical advances in the use of MXene-based nanozymes,as well as their developmental challenges and future prospects are also *** v

关键词： MXenes MXene-based nanozymes Therapeutics Diagnostics Theranostics

Effect of plastic deformation on microstructure and thermoelectric properties of Mg_(2)Sn alloys

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Journal of Magnesium and Alloys 2021年第1期9卷 123-129页

作者： rameshkumar.varma Sitarama Kada Matthew Barnett Institute for Frontier Materials Deakin UniversityGeelongVictoriaAustralia

In the present work,the effect of deformation on microstructure and thermoelectric properties of Mg 2 Sn alloys having excess magnesium concentrations is *** cast alloys were prepared using radio-frequency(rF)induction melting under an argon *** alloys were thermo-mechanically processed via compression at different temperatures to various true *** room temperature,the alloys failed at a true strain of∼13%.However,at elevated temperatures,the alloys were observed to be highly *** alloys compressed at 673 K to a true strain of 1,a prominent substructure *** subgrain size was∼3-5μ*** is believed that the substructure arose from the action of dynamic *** deformation,the thermoelectric performance of alloy prepared with 6.7 wt.%excess Mg was improved compared to the as cast *** can be ascribed to a reduction in the thermal conductivity due to phonon scattering at grain boundaries.

关键词： Magnesium Thermoelectric Deformation Grain size

Wetting of MXenes and Beyond

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Nano-Micro Letters 2023年第8期15卷 141-153页

作者： Massoud Malaki rajender S.varma Department of Mechanical Engineering Isfahan University of TechnologyDaneshgah e Sanati HwyKhomeyni ShahrIsfahan 84156‑83111Iran regional Centre of Advanced Technologies and Materials Palacky University in OlomoucŠlechtitelů2778371 OlomoucCzech Republic

MXenes are a class of 2D nanomaterials with exceptional tailormade properties such as mechano-ceramic nature,rich chemistry,and hydrophilicity,to name a ***,one of the most challenging issues in any composite/hybrid system is the interfacial *** a superior integrity of a given composite system is a direct consequence of the proper *** wetting is a fundamental feature,dictating many physical and chemical attributes,most of the common nanomaterials possesses poor affinity due to hydrophobic nature,making them hard to be easily dispersed in a given *** to low contact angle,MXenes can offer themselves as an ideal candidate for manufacturing different nano-hybrid *** this review,it is aimed to particularly study the wettability of *** terms of the layout of the present study,MXenes are first briefly introduced,and then,the wettability phenomenon is discussed in *** reviewing the sporadic research efforts conducted to date,a particular attention is paid on the current challenges and research pitfalls to light up the future *** is strongly believed that taking the advantage of MXene’s rich hydrophilic surface may have a revolutionizing role in the fabrication of advanced materials with exceptional features.

关键词： MXene Wetting Hydrophilicity Composites 2D material

Harvesting legume genomes for disease resistance traits

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Harvesting legume genomes for disease resistance traits