Fabrication of a flexible biomimetic film with spontaneously unidirectional water-spreading property

Micro & nano letters

article

Longjun Tang¹  Xiaolin Wang¹  Wen Hong¹  Wenxi Sun¹  Bin Yang¹  Xiang Chen¹  Jingquan Liu¹ 

[1] National Key Laboratory of Science and Technology on Micro/Nano Fabrication, Shanghai Jiao Tong University;Key Laboratory for Thin Film and Microfabrication of the Ministry of Education, Shanghai Jiao Tong University;Collaborative Innovation Center of IFSA, Department of Micro/Nano Electronics, Shanghai Jiao Tong University

关键词: liquid films;    biomimetics;    wetting;    rough surfaces;    flexible biomimetic film;    microstructure;    Nepenthes alata peristome;    parylene-C;    sacrificial layer technology;    unidirectional water spreading;    wetting;    anisotropic spreading;    rough surfaces;    nonpower microfluidic platform;   

DOI  :  10.1049/mnl.2017.0472

学科分类：计算机科学（综合）

来源: Wiley

【 摘 要 】

Field trials were conducted at Umudike, Nigeria, during the 2015 and 2016 cropping seasons to determine the efficacy of plant extracts from seven plant species against field insect pests of mung bean,  Vigna radiata  L. Wilczek. The extracts tested were obtained from scent leaf ( Ocimum gratissimum ), neem leaf ( Azadirachta indica ), bitter leaf ( Vernonia amygdalina ), garlic ( Allium sativum ), turmeric ( Curcuma longa ), plantain ( Musa paradisiaca ) peel and Negro pepper ( Xylopia aethiopica ). Karate (Lambda-cyhalothrin EC) at 50 mL was introduced as a check in the trials. The experimental design was a randomised complete block design (RCBD) with three replicates. Data were collected weekly on the insect population densities, yield and yield components. The results indicated that all the treatments were effective against mung bean insect pests ( Aphis craccivora  [aphid],  Bemisia tabaci  [whitefly],  Amrasca biguttula biguttula  [jassid] and  Zonocerus variegatus [grasshopper]). There was a significant ( p  ≤ 0.05) reduction in the population of insects on the plots treated with plant extracts and karate in 2015 and 2016 cropping seasons. The population densities of grasshoppers in 2015 and whitefly in 2016 were significantly lower in the treated plots compared with the control plots.  Azadirachta indica  and  C. longa  extracts recorded the highest seed yield of 50.00 kg/ha and 42.33 kg/ha in 2015 and 2016, respectively. No significant differences were observed between the plant extracts and karate, which recorded significantly higher yields when compared with the control (23.30 kg/ha). All the plant extracts used exhibited insecticidal activity against the insect pests of mung bean. It is, therefore, recommended that these plant extracts can be used for the control of mung bean insect pests to achieve sustainable production, food security and quality.

【 授权许可】

CC BY|CC BY-ND|CC BY-NC|CC BY-NC-ND