• Applied Microscopy
• /
• v.42 no.2
• /
• pp.95-103
• /
• 2012

The cell surface sculpture of the plant epidermis has received great interest recently. It has also been an active area of research, as the biological microstructures of the surface, such as papillae and waxes, exhibit several unique properties, including self-cleaning character; namely the "Lotus effect" first described in the leaves of the lotus, Nelumbo nucifera. The Lotus effect is the phenomenon in which the super-hydrophobic and water-repellent nature of lotus leaves allow water drops to run off easily on the surface in a rolling and sliding motion thereby facilitating the removal of dirt particles. It is well-known that surface roughness on the micro- and nanoscale is a primary characteristic allowing for the Lotus effect. This effect is common among plants and is of great technological importance, since it can be applied industrially in numerous fields. In the present study, Nelumbo nucifera leaf and stem epidermal surfaces have been examined with a focus on the features of papillae and wax crystalloids. Both young and mature Nelumbo nucifera leaf epidermis demonstrated the Lotus effect on their entire epidermal surface. The central area of the upper epidermis, in particular, formed extremely papillose surfaces, with an additional wax layer, enabling greater water repellency. Despite the presence of wax crystalloids, epidermal surfaces of the lower leaf and stem lacking papillae, were much more easily wetted.

• Food Science and Preservation
• /
• v.21 no.3
• /
• pp.328-333
• /
• 2014

The principal objective of this study was to determine the quality characteristics of Maejakgwa prepared with the addition of lotus leaf powder. The moisture, crude ash, crude protein, crude lipid, and carbohydrate contents of the used lotus leaf powder were 2.97%, 8.09%, 22.83%, 0.93%, and 65.18%, respectively. The pH of the Maejakgwas dough decreased significantly as the level of lotus leaf powder increased; however, there were no significant differences in dough values among the test groups. Furthermore, the spread factor values and water contents of the groups increased significantly as the level of the lotus leaf powder concentration. In addition, the Hunter's color L, a, and b values decreased significantly with increasing amounts of lotus leaf powder. In the texture meter test, the hardness increased according to increasing concentrations of lotus leaf powder. Finally, the results of a sensory properties showed that Maejakgwas containing 2% lotus leaf powder had the highest scores. These results suggest that lotus leaf powder can be applied to Maejakgwas to achieve high quality and functionality.

• Proceeding of EDISON Challenge
• /
• 2016.03a
• /
• pp.67-74
• /
• 2016

초발수 표면은 표면이 젖지 않으면서 물방울이 자유롭게 움직일 수 있는 표면을 말한다. 이는 자연에서 많이 관찰되며 예를 들면 연잎, 나비와 곤충의 다리가 대표적이다. 일반적으로 초발수 표면은 물방울과 접촉할 때 이루는 각이 $150^{\circ}$보다 크며, 표면을 $5^{\circ}$정도 기울이면 물방울이 굴러가기 시작한다. 특히 연잎 표면을 자세히 보면 마이크로/나노단위의 미세한 돌기가 표면 위에 존재한다. 이러한 연잎 표면의 구조에 따른 특성을 모방하여 표면 위에 인위적으로 다양한 모양, 크기의 돌기를 만들어 표면의 초발수 특성을 향상시키는 연구가 활발히 이루어지고 있다. 연구가 다양하고 광범위하게 진행되면서, 학문적인 원인 분석 외에도 산업에서의 활용가능성이 주목받고 있다. 이에 따라 이 논문은 전산모사 방법을 사용하여 표면 돌기와 관련된 다양한 변수(돌기의 모양, 높이, 너비, 돌기 사이의 간격, 표면과 물 분자 간의 에너지)에 따라 표면의 초발수 특성이 어떻게 변하는지 연구해보고, 초발수 현상의 특징과 그 발생 원인을 이해하는데 목적을 두며 이러한 연구결과는 실제 산업현장에서 최적의 초발수 표면을 제작하는데 도움을 줄 것이다.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.16 no.9
• /
• pp.5756-5762
• /
• 2015

This paper has studied the lotus effect of the biomimetic engineering that is inspired from the nature. The biomimetic engineering has been improved with the nanotechnology. This paper has observed the hydrophobic property of the surface of the lotus leaf by using the scanning electron microscope (SEM) and atomic force microscope (AFM). The nano-scale of the hydrophobic lotus leaves are maximized the surface tension of water. The general grass leaf has been compared with the lotus leaf through the SEM and AFM - in the viewpoint of the 2D and 3D morphology. Also, The pre-existing of the hydrophobic theory was investigated and compared with the experimental observations for the lotus leaf.

• Journal of Applied Biological Chemistry
• /
• v.64 no.2
• /
• pp.121-125
• /
• 2021

Antioxidative, anticoagulant, and α-glucosidase inhibitory effects of 60% (v/v) ethanolic extract from lotus (Nelumbo nucifera) leaves were investigated in vitro. The yield and polyphenol content of the lotus leaves extract were 35.3±1.1% and 186.2±5.2 ㎍ gallic acid equivalents/mg, respectively. The lotus leaves extract effectively scavenged free and cation radicals, and nitrite in a concentration-dependent manner, and possessed potent reducing power. The lotus leaves extract had remarkable anticoagulant and α-glucosidase inhibitory activities as a function of the extract concentration.

• Proceedings of the Materials Research Society of Korea Conference
• /
• 2011.05a
• /
• pp.33.1-33.1
• /
• 2011

최근 산업에서는 산업의 고도화로 인한 환경오염이 큰 문제로 대두되고 있다. 이러한 문제점을 해결하기 위한 방안 중, 친환경소재에 대해 연구가 활발히 진행하고 있다. 연잎의 자기세정효과(self-cleaning effect)에 관한 연구는 이러한 친환경소재에 대한 연구 중 하나이다. 연잎의 표면은 마이크로 크기의 돌기와 나노 크기의 왁스의 dual-scale의 구조로 이루어져 있으며, 왁스의 경우 소수성을 가진다. 이러한 dual-scale 구조와 소수성의 왁스에 의해 초소수성이 발현되고, 결과적으로 연잎의 자기세정효과가 발현된다. 본 연구에서는 나노임프린트 리소그래피와 수열합성법을 이용한 나노로드 성장을 이용하여, 연잎의 dual-scale의 표면구조를 형성하는 실험을 진행하였다. 나노임프린트 리소그래피와 수열합성법은 다른 공정에 비하여 상대적으로 적은 비용을 필요로 하고, 대면적에 적용이 가능한 기술이다. 실험 진행은 먼저 silicon 마스터 스탬프를 역상으로 복제한 PDMS (Polydimethylsiloxane) 스탬프와 $TiO_2$ sol을 이용하여 기판 위에 $TiO_2$ gel 패턴을 형성한 후, 열처리 과정을 통해 $TiO_2$ gel 패턴을 결정화한다. 다음으로 결정화된 $TiO_2$ 패턴 기판을 수열합성 방법을 이용하여 $TiO_2$ 나노로드를 무작위적으로 형성하였다. 마지막으로 소수성을 갖는 자기 조립 단분자막 용액을 이용하여 소수성 표면처리를 한 후 접촉각을 측정하였다. 본 연구에서 개발한 기술을 이용하여 다양한 형태의 기판에 초소수성 표면을 형성할 수 있고, 자기세정효과를 갖는 표면을 구현할 수 있다.

• 프린팅코리아
• /
• v.9 no.3
• /
• pp.62-62
• /
• 2010

마이크로콘트롤스(대표 조병우)에서 공급하고 있는 액화금속코팅 재킷인 J750BL시리즈는 뛰어난 성능과 다양한 기능으로 주목을 받고 있다. 3층으로 구성되어 있는 특수코팅층은 이른바 '연잎 효과(Lotus Effect)'를 구현하고 있다. 연잎 효과는 반발력을 최대화하는 기능을 발휘하는데 있어 중요한 역할을 감당하며 장기간 사용해도 성능 발휘에 지장이 없다. 인쇄작업의 효율성 제고와 친환경성을 감안하고 있다.

• Journal of the Korea Society of Computer and Information
• /
• v.28 no.2
• /
• pp.181-190
• /
• 2023

This study examined that have excellent antioxidant effect and expand the base of consumption of lotus leaves. We added 1%, 3%, and 5% of lotus leaf powder to traditional gochujang. pH was the highest in the gochujang with lotus leaf powder 1%(p<0.001). The moisture was significantly lower as the addition of lotus leaf powder increased(p<0.01). The viscosity was the lowest with lotus leaf powder 5% was found to be 15.61 dPa·s(p<0.001). In chromaticity, the L value was the highest in the control, the viscosity of gochujang became darker and lessened(p<0.001). The a value and b value showed the highest in the control(p<0.001). The salinity was the lowest in the gochujang with lotus leaf powder 3%(p<0.001). The sugar content decreased as the more amount of lotus leaf. Total phenol and total flavonoid contents was the highest in the gochujang with lotus leaf powder 5%. The DPPH radical scavenging ability was higher as the more amount of lotus leaf. Reducing power and α-glucosidase inhibitory activity was the highest in the gochujang with lotus leaf powder 3%. The gochujang with lotus leaf powder can be expected to have higher antioxidant activities and to be a health functional food.

• Journal of the Korean Society of Food Science and Nutrition
• /
• v.37 no.12
• /
• pp.1622-1626
• /
• 2008

This study was carried out for the analysis of chemical composition and antioxidative activity of lotus leaf. The lotus leaf contained 63.8% of crude carbohydrate, 16.9% of crude protein, 1.0% crude fat, and 9.3% of crude ash including high amount of calcium (2.2%). The antioxidative effect of several solvents extracts of lotus leaf was investigated. Among them 70% ethanol extract showed relatively higher extraction yield and higher total phenol content as well as the highest electron-donating ability using 1,1-diphenyl-2-picryl hydroxyl.

• Journal of the Korean Society of Food Science and Nutrition
• /
• v.40 no.11
• /
• pp.1544-1547
• /
• 2011

Lotus (Nelumbo nucifera) leaf is known to be effective for 'overcoming body heat' and stopping bleeding. It is commonly used as a traditional curing plant for the treatment of hematemesis, epistaxis, hemoptysis, hematuria, and metrorrhagia in traditional Chinese medicine. This study investigated on the effect of oral administration of lotus (Nelumbo nucifera) leaf extract on the serum and liver lipid levels of rats fed a high fat diet. Experimental rats were divided into five different experimental groups, including the general diet group (Cont), high fat diet with lotus leaf extract groups (HL40, HL80, HL120), and high fat diet group (HFG). Body weight significantly decreased in the HL120 sample compared to that of Cont. The weights of the livers and kidneys of rats corresponded to the increase in body weight. Total cholesterol and triglyceride contents in liver tissues of rats were lowest in the sample HL120 sample. The levels of total lipids, total cholesterol, and triglycerides in serum were lower in the HL120 sample compared to the HFG.